Underground Space最新文献

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Imbalanced rock burst assessment using variational autoencoder-enhanced gradient boosting algorithms and explainability 利用变异自动编码器增强梯度提升算法和可解释性进行失衡岩爆评估
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-14 DOI: 10.1016/j.undsp.2023.11.008
Shan Lin , Zenglong Liang , Miao Dong , Hongwei Guo , Hong Zheng
{"title":"Imbalanced rock burst assessment using variational autoencoder-enhanced gradient boosting algorithms and explainability","authors":"Shan Lin ,&nbsp;Zenglong Liang ,&nbsp;Miao Dong ,&nbsp;Hongwei Guo ,&nbsp;Hong Zheng","doi":"10.1016/j.undsp.2023.11.008","DOIUrl":"10.1016/j.undsp.2023.11.008","url":null,"abstract":"<div><p>We conducted a study to evaluate the potential and robustness of gradient boosting algorithms in rock burst assessment, established a variational autoencoder (VAE) to address the imbalance rock burst dataset, and proposed a multilevel explainable artificial intelligence (XAI) tailored for tree-based ensemble learning. We collected 537 data from real-world rock burst records and selected four critical features contributing to rock burst occurrences. Initially, we employed data visualization to gain insight into the data's structure and performed correlation analysis to explore the data distribution and feature relationships. Then, we set up a VAE model to generate samples for the minority class due to the imbalanced class distribution. In conjunction with the VAE, we compared and evaluated six state-of-the-art ensemble models, including gradient boosting algorithms and the classical logistic regression model, for rock burst prediction. The results indicated that gradient boosting algorithms outperformed the classical single models, and the VAE-classifier outperformed the original classifier, with the VAE-NGBoost model yielding the most favorable results. Compared to other resampling methods combined with NGBoost for imbalanced datasets, such as synthetic minority oversampling technique (SMOTE), SMOTE-edited nearest neighbours (SMOTE-ENN), and SMOTE-tomek links (SMOTE-Tomek), the VAE-NGBoost model yielded the best performance. Finally, we developed a multilevel XAI model using feature sensitivity analysis, Tree Shapley Additive exPlanations (Tree SHAP), and Anchor to provide an in-depth exploration of the decision-making mechanics of VAE-NGBoost, further enhancing the accountability of tree-based ensemble models in predicting rock burst occurrences.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 226-245"},"PeriodicalIF":6.4,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000060/pdfft?md5=f371e39062d1a6f6632474feee358962&pid=1-s2.0-S2467967424000060-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139539127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantitative evaluation of the contribution of underground space to urban resilience: A case study in China 地下空间对城市复原力贡献的定量评估:中国案例研究
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-11 DOI: 10.1016/j.undsp.2023.11.007
Si-Cong Liu, Fang-Le Peng, Yong-Kang Qiao, Yun-Hao Dong
{"title":"Quantitative evaluation of the contribution of underground space to urban resilience: A case study in China","authors":"Si-Cong Liu,&nbsp;Fang-Le Peng,&nbsp;Yong-Kang Qiao,&nbsp;Yun-Hao Dong","doi":"10.1016/j.undsp.2023.11.007","DOIUrl":"10.1016/j.undsp.2023.11.007","url":null,"abstract":"<div><p>Urban underground space (UUS) development has been acknowledged as a positive contribution to urban resilience (UR). Such contribution has been qualitatively addressed in recent years, but only quantitatively discussed in few studies. Quantitative evaluation methods for UR are widely used in China and around the world, but the role of underground space is barely included. This paper provides a way to bridge this gap on the city scale. A UR evaluation framework was carefully constructed that covers the basic aspects and elements of UR. The contributions of UUS to UR were identified and integrated into the UR evaluation framework, and the measurement methods for each indicator related to UUS were determined. A case study of 19 sample cities in China were conducted using the integrated evaluation model. Correlation analysis and clustering analysis were further adopted to interpret the evaluation results, mainly with three indicators reflecting the level of UUS development, namely UUS area (m<sup>2</sup>), UUS density (10<sup>4</sup> m<sup>2</sup>/km<sup>2</sup>) and UUS area per capita (m<sup>2</sup>/person). The results showed a strong correlation between UUS area and UR. The average proportion of UR provided by UUS in the 19 sample cities was 16.46%, while the maximum figure reached 29.20%. The sample cities were clustered into four categories based on the relationship between the proportion of UR provided by UUS, UUS area, and GDP per capita, where both high and low UUS area tend to provide less proportion of resilience than the medium UUS area. Corresponding suggestions for UUS utilization were proposed to assist cities in achieving urban resilience.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 1-24"},"PeriodicalIF":6.4,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000059/pdfft?md5=d8090d8c08f06efa9fb39e27b3aff3f9&pid=1-s2.0-S2467967424000059-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139635318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Endurance time history analysis of the seismic behavior and performance assessment of hydro-chemo-mechanical degradation-affected hydraulic tunnels with service time 对受水文-化学-机械退化影响的水工隧道的抗震行为和性能评估进行耐久性时间历程分析(含服役时间
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-09 DOI: 10.1016/j.undsp.2023.11.006
Benbo Sun , Pengxiao Wang , Gangqin Zhang , Mingjiang Deng , Weiying Liu , Jia Xu
{"title":"Endurance time history analysis of the seismic behavior and performance assessment of hydro-chemo-mechanical degradation-affected hydraulic tunnels with service time","authors":"Benbo Sun ,&nbsp;Pengxiao Wang ,&nbsp;Gangqin Zhang ,&nbsp;Mingjiang Deng ,&nbsp;Weiying Liu ,&nbsp;Jia Xu","doi":"10.1016/j.undsp.2023.11.006","DOIUrl":"10.1016/j.undsp.2023.11.006","url":null,"abstract":"<div><p>Subjected to the coupling action of multiple hazards in hydraulic engineering, hydraulic tunnels may be corroded and damaged to varying degrees during their service lives, which will decrease the seismic performance of these structures. However, the research and seismic design of significant hydraulic engineering projects focus on investigating the structural response based on the design material parameters, which may overestimate the seismic capacity of structures during their service lives. In this paper, research is performed to identify the effect of hydro-chemo-mechanical corrosion on the seismic performance of hydraulic tunnels with different burial depths. A plastic damage model of time-varying concrete degradation induced by the hydro-chemo-mechanical effect is first determined and implemented, and the endurance time acceleration records are generated in MATLAB. Then, a study of the endurance time relationship of hydro-chemo-mechanical corrosion-affected hydraulic tunnels, considering the fluid–structure-surrounding rock interaction systems throughout the service period, is undertaken to directly associate the structural response with the predefined evaluation index. Moreover, this research constructs 3D time-varying fragility surfaces considering the hydro-chemo-mechanical effect and seismic intensity. The results show that the relative displacement of hydro-chemo-mechanical corrosion-affected hydraulic tunnels is larger than that of nonaffected hydraulic tunnels. Hydro-chemo-mechanical effect-induced material deterioration will lead to an increase in the cumulative damage (crack) area and damage degree of hydraulic tunnels. Additionally, the seismic fragility analysis shows that the longer the service time of hydro-chemo-mechanical corrosion-affected hydraulic tunnels, the more likely they are to collapse. Hence, attention should be given to improving the aseismic capacity of hydro-chemo-mechanical corrosion-affected hydraulic tunnels in future seismic design and performance assessments.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 207-225"},"PeriodicalIF":6.4,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000047/pdfft?md5=58f6cd39c96d325230a08bf7ea3cd245&pid=1-s2.0-S2467967424000047-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139454931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Performance comparison of machine learning algorithms for maximum displacement prediction in soldier pile wall excavation 用于兵工桩墙挖掘最大位移预测的机器学习算法性能比较
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-09 DOI: 10.1016/j.undsp.2023.09.013
Danial Sheini Dashtgoli , Mohammad Hossein Dehnad , Seyed Ahmad Mobinipour , Michela Giustiniani
{"title":"Performance comparison of machine learning algorithms for maximum displacement prediction in soldier pile wall excavation","authors":"Danial Sheini Dashtgoli ,&nbsp;Mohammad Hossein Dehnad ,&nbsp;Seyed Ahmad Mobinipour ,&nbsp;Michela Giustiniani","doi":"10.1016/j.undsp.2023.09.013","DOIUrl":"10.1016/j.undsp.2023.09.013","url":null,"abstract":"<div><p>One of the common excavation methods in the construction of urban infrastructures as well as water and wastewater facilities is the excavation through soldier pile walls. The maximum lateral displacement of pile wall is one of the important variables in controlling the stability of the excavation and its adjacent structures. Nowadays, the application of machine learning methods is widely used in engineering sciences due to its low cost and high speed of calculation. This paper utilized three intelligent machine learning algorithms based on the excavation method through soldier pile walls, namely eXtreme gradient boosting (XGBoost), least square support vector regressor (LS-SVR), and random forest (RF), to predict maximum lateral displacement of pile walls. The results showed that the implemented XGBoost model performed excellently and could make predictions for maximum lateral displacement of pile walls with the mean absolute error of 0.1669, the highest coefficient of determination 0.9991, and the lowest root mean square error 0.3544. Although the LS-SVR, and RF models were less accurate than the XGBoost model, they provided good prediction results of maximum lateral displacement of pile walls for numerical outcomes. Furthermore, a sensitivity analysis was performed to determine the most effective parameters in the XGBoost model. This analysis showed that soil elastic modulus and excavation height had a strong influence on of maximum lateral displacement of pile wall prediction.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"16 ","pages":"Pages 301-313"},"PeriodicalIF":6.4,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000035/pdfft?md5=6b86621d0968f7484be174e6a73f9f0d&pid=1-s2.0-S2467967424000035-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139455040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of GIS and BIM for the integration of tunnel design and construction process in conventional tunneling 在传统隧道工程中使用地理信息系统(GIS)和建筑信息模型(BIM)整合隧道设计和施工过程
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-04 DOI: 10.1016/j.undsp.2023.10.009
Mansour Hedayatzadeh , Jamal Rostami , Vasilis Sarhosis , Mojtaba Nematollahi , Nabiollah Hajiantilaki , Abouzar Shafiepour
{"title":"Use of GIS and BIM for the integration of tunnel design and construction process in conventional tunneling","authors":"Mansour Hedayatzadeh ,&nbsp;Jamal Rostami ,&nbsp;Vasilis Sarhosis ,&nbsp;Mojtaba Nematollahi ,&nbsp;Nabiollah Hajiantilaki ,&nbsp;Abouzar Shafiepour","doi":"10.1016/j.undsp.2023.10.009","DOIUrl":"10.1016/j.undsp.2023.10.009","url":null,"abstract":"<div><p>This paper presents the development of a framework for the parametric design of tunnels using geographic information system (GIS) mapping and building information modelling (BIM). According to the framework, a parametric representation of each system component (e.g., layers of rock mass, size of excavation, topography, fault geometry, primary lining, secondary lining, rock bolts, etc.) can be incorporated in the GIS model with high levels of detail and used for the automatic generation of numerical models for the design of tunnel construction. This parametric evaluation allows the designer to consider several levels of detail for each component, for the efficient design and process optimization in conventional tunneling. Information between parametric analysis and numerical simulations can be freely exchanged with significantly reduced computational effort while results can be exported into BIM. It is anticipated that the proposed framework could lead to a comprehensive, yet efficient analysis of complex conventional tunneling project using parametric evaluations at the early design stages.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"16 ","pages":"Pages 261-278"},"PeriodicalIF":6.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967423001770/pdfft?md5=41be5bfbc4aa457ff9002ee16a12fe4c&pid=1-s2.0-S2467967423001770-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139392250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of erosion voids and traffic loads on buried large-diameter reinforced concrete pipes 侵蚀空隙和交通荷载对埋地大直径钢筋混凝土管道的影响
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-04 DOI: 10.1016/j.undsp.2023.11.005
Ming Xu , Dawei Shen
{"title":"Influence of erosion voids and traffic loads on buried large-diameter reinforced concrete pipes","authors":"Ming Xu ,&nbsp;Dawei Shen","doi":"10.1016/j.undsp.2023.11.005","DOIUrl":"10.1016/j.undsp.2023.11.005","url":null,"abstract":"<div><p>Geotechnical centrifuge tests were conducted to examine the influence of invert voids and surface traffic loads on 1400 mm diameter reinforced concrete pipes buried with a shallow soil cover depth of 700 mm. Void formation beneath the pipe was simulated during centrifuge testing. The test results revealed that before void formation, the surface load directly above the middle of the pipe caused a significant increase in not only the circumferential bending moments but also the longitudinal bending moments, the latter of which was considerable and could not be ignored. Void formation beneath the middle of the pipe led to a reduction in both the circumferential bending moments and longitudinal bending moments at all measuring positions, i.e., crown, springline, and invert. The most significant reduction occurred at the invert, and there was even a reversal in the sign of the invert longitudinal bending moment. A comparison was made between centrifuge tests with erosion voids and surface loads at different horizontal positions, which had a marked influence even when the positions differed by half a pipe length. Joint rotation played an important role in relieving large bending moments of pipe barrels in a jointed pipeline when the void and surface load were located at the joint.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 120-131"},"PeriodicalIF":6.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000023/pdfft?md5=1c8115ad2f81e06dc2dbad207c35efa1&pid=1-s2.0-S2467967424000023-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139394896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Immersive visualization of 3D subsurface ground model developed from sparse boreholes using virtual reality (VR) 利用虚拟现实技术(VR)实现根据稀疏钻孔开发的三维地下模型的沉浸式可视化
IF 6.4 1区 工程技术
Underground Space Pub Date : 2024-01-04 DOI: 10.1016/j.undsp.2023.11.004
Borui Lyu, Yu Wang
{"title":"Immersive visualization of 3D subsurface ground model developed from sparse boreholes using virtual reality (VR)","authors":"Borui Lyu,&nbsp;Yu Wang","doi":"10.1016/j.undsp.2023.11.004","DOIUrl":"10.1016/j.undsp.2023.11.004","url":null,"abstract":"<div><p>Analytics and visualization of multi-dimensional and complex geo-data, such as three-dimensional (3D) subsurface ground models, is critical for development of underground space and design and construction of underground structures (e.g., tunnels, dams, and slopes) in engineering practices. Although complicated 3D subsurface ground models now can be developed from site investigation data (e.g., boreholes) which is often sparse in practice, it remains a great challenge to visualize a 3D subsurface ground model with sophisticated stratigraphic variations by conventional two-dimensional (2D) geological cross-sections. Virtual reality (VR) technology, which has an attractive capability of constructing a virtual environment that links to the physical world, has been rapidly developed and applied to visualization in various disciplines recently. Leveraging on the rapid development of VR, this study proposes a framework for immersive visualization of 3D subsurface ground models in geo-applications using VR technology. The 3D subsurface model is first developed from limited borehole data in a data-driven manner. Then, a VR system is developed using related software and hardware devices currently available in the markets for immersive visualization and interaction with the developed 3D subsurface ground model. The results demonstrate that VR visualization of the 3D subsurface ground model in an immersive environment has great potential in revolutionizing the geo-practices from 2D cross-sections to a 3D immersive virtual environment in digital era, particularly for the emerging digital twins.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 188-206"},"PeriodicalIF":6.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000011/pdfft?md5=450c161b7b254da60e3f326fe1c5dcff&pid=1-s2.0-S2467967424000011-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139393072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction 盾构隧道施工过程中分段接头接触应力的压电传感方法
IF 6.4 1区 工程技术
Underground Space Pub Date : 2023-12-28 DOI: 10.1016/j.undsp.2023.10.007
Guodong Jiang , Minghao Dai , Guozhu Zhang , Limin Gao
{"title":"Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction","authors":"Guodong Jiang ,&nbsp;Minghao Dai ,&nbsp;Guozhu Zhang ,&nbsp;Limin Gao","doi":"10.1016/j.undsp.2023.10.007","DOIUrl":"10.1016/j.undsp.2023.10.007","url":null,"abstract":"<div><p>The emergence of curved shield tunnels poses a significant construction challenge. If the quality of the segment assembly is not guaranteed, many segment cracks and damage will result from the stress concentration. Sensing the contact stresses between segmental joints is necessary to improve the quality of segments assembled for shield tunnel construction. Polyvinylidene difluoride (PVDF) piezoelectric material was chosen for the sensor because it can convert contact stresses into electrical signals, allowing the state of the segmental joints to be effectively sensed. It matches the working environment between the segmental joints of the shield tunnel, where flexible structures such as rubber gaskets and force transfer pads are present. This study proposes a piezoelectric sensing method for segmental joints in shield tunnels and conducts laboratory tests, numerical analyses, and field tests to validate the feasibility of the method. The results indicate that the PVDF film sensor can effectively sense the entire compression process of the gasket with different amounts of compression. The piezoelectric cable sensor can effectively sense the joint offset direction of the gasket. For differently shaped sections, the variation in the force sensed by the piezoelectric cable sensors was different, as verified by numerical simulation. Through the field test, it was found that the average contact stress between the segmental joints was in the range of 1.2–1.8 MPa during construction of the curved shield tunnels. The location of the segmental joints and the type of segment affect the contact stress value. The field monitoring results show that piezoelectric sensing technology can be successfully applied during assembly of the segments for effective sensing of the contact stress.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 82-99"},"PeriodicalIF":6.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967423001745/pdfft?md5=a2f1d202a84a4909db4dd8ae39dd2515&pid=1-s2.0-S2467967423001745-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139188375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels 沉管隧道砂填充层状态评估及对分段变形的影响
IF 6.4 1区 工程技术
Underground Space Pub Date : 2023-12-28 DOI: 10.1016/j.undsp.2023.10.008
Ziyao Xu , Ailan Che , Chao Su
{"title":"Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels","authors":"Ziyao Xu ,&nbsp;Ailan Che ,&nbsp;Chao Su","doi":"10.1016/j.undsp.2023.10.008","DOIUrl":"10.1016/j.undsp.2023.10.008","url":null,"abstract":"<div><p>The immersed tunnel is considered an effective solution for traffic problems across rivers and seas. The sand filling layer, as an important part of immersed tunnel foundation treatments, directly affects segment attitude stability. Due to difficulties in quality control of concealed construction and the complex hydrodynamic environment, the sand filling layer is prone to compaction defects, further leading to changes in segment attitude. However, limited by structural concealment and state complexity, most studies consider the sand filling layer part of the foundation to study its impact on settlement while neglecting its influence on segment attitude. This research proposes an evaluation method for the sand filling layer state based on elastic wave testing and the elastic wave characteristic parameters selected come from analysis of the time domain, frequency domain and time–frequency domain. By classifying the elastic wave characteristic parameters through the <em>K</em>-means clustering method, the relationship between the state of the sand filling layer and the elastic wave characteristic parameters is established. The state of the sand filling layer is divided into dense, incompact, and void. A numerical model is established based on the Guangzhou BI-UT immersed tunnel with incompact and void sand filling layer states to simulate deformation and torsion. The results indicate that the settlement of the tunnel segment is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer, with a maximum differential settlement of 0.04 m. The evaluation method plays a crucial role in guiding the construction of immersed tube tunnels.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"16 ","pages":"Pages 224-238"},"PeriodicalIF":6.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967423001769/pdfft?md5=5b0f00fe3d9799e04582e082c0394b58&pid=1-s2.0-S2467967423001769-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139192759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils 开挖非均匀土隧道时,刀盘开口率对土拱效应和工作面稳定性的影响
IF 6.4 1区 工程技术
Underground Space Pub Date : 2023-12-28 DOI: 10.1016/j.undsp.2023.11.003
Xue-Jian Chen , Pei-Pei Fang , Qiu-Nan Chen , Jun Hu , Kai Yao , Yong Liu
{"title":"Influence of cutterhead opening ratio on soil arching effect and face stability during tunnelling through non-uniform soils","authors":"Xue-Jian Chen ,&nbsp;Pei-Pei Fang ,&nbsp;Qiu-Nan Chen ,&nbsp;Jun Hu ,&nbsp;Kai Yao ,&nbsp;Yong Liu","doi":"10.1016/j.undsp.2023.11.003","DOIUrl":"10.1016/j.undsp.2023.11.003","url":null,"abstract":"<div><p>Tunnelling has increasingly become an essential tool in the exploration of underground space. A typical construction problem is the face instability during tunnelling, posing a great threat to associated infrastructures. Tunnel face instability often occurs with the soil arching collapse. This study investigates the combined effect of cutterhead opening ratio and soil non-uniformity on soil arching effect and face stability, via conducting random finite-element analysis coupled with Monte–Carlo simulations. The results underscore that the face stability is strongly associated with the evolution of stress arch. The obtained stability factors in the uniform soils can serve as a reference for the design of support pressure in practical tunnelling engineering. In addition, non-uniform soils exhibit a lower stability factor than uniform soils, which implies that the latter likely yields an underestimated probability of face failure. The tunnel face is found to have a probability of failure more than 50% if the spatial non-uniformity of soil is ignored. In the end, a practical framework is established to determine factor of safety (FOS) corresponding to different levels of probability of face failure considering various opening ratios in non-uniform soils. The required FOS is 1.70 to limit the probability of face instability no more than 0.1%. Our findings can facilitate the prediction of probability of instability in the conventionally deterministic design of face pressure.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"17 ","pages":"Pages 45-59"},"PeriodicalIF":6.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967423001757/pdfft?md5=47883d1714263672075b0eba518de05c&pid=1-s2.0-S2467967423001757-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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