Underground Space最新文献_第6页

Cross-scale mechanical softening of Marcellus shale induced by CO2-water–rock interactions using nanoindentation and accurate grain-based modeling 利用纳米压痕技术和基于晶粒的精确建模，研究二氧化碳-水-岩石相互作用诱发的马塞勒斯页岩跨尺度机械软化现象

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-05-18 DOI: 10.1016/j.undsp.2024.02.001

Yiwei Liu , Quansheng Liu , Zhijun Wu , Shimin Liu , Yong Kang , Xuhai Tang

{"title":"Cross-scale mechanical softening of Marcellus shale induced by CO2-water–rock interactions using nanoindentation and accurate grain-based modeling","authors":"Yiwei Liu , Quansheng Liu , Zhijun Wu , Shimin Liu , Yong Kang , Xuhai Tang","doi":"10.1016/j.undsp.2024.02.001","DOIUrl":"10.1016/j.undsp.2024.02.001","url":null,"abstract":"<div><p>Mechanical softening behaviors of shale in CO<sub>2</sub>-water–rock interaction are critical for shale gas exploitation and CO<sub>2</sub> sequestration. This work investigated the cross-scale mechanical softening of shale triggered by CO<sub>2</sub>-water–rock interaction. Initially, the mechanical softening of shale following 30 d of exposure to CO<sub>2</sub> and water was assessed at the rock-forming mineral scale using nanoindentation. The mechanical alterations of rock-forming minerals, including quartz, muscovite, chlorite, and kaolinite, were analyzed and compared. Subsequently, an accurate grain-based modeling (AGBM) was proposed to upscale the nanoindentation results. Numerical models were generated based on the real microstructure of shale derived from TESCAN integrated minerals analyzer (TIMA) digital images. Mechanical parameters of shale minerals determined by nanoindentation served as input material properties for AGBMs. Finally, numerical simulations of uniaxial compression tests were conducted to investigate the impact of mineral softening on the macroscopic Young’s modulus and uniaxial compressive strength (UCS) of shale. The results present direct evidence of shale mineral softening during CO<sub>2</sub>-water–rock interaction and explore its influence on the upscale mechanical properties of shale. This paper offers a microscopic perspective for comprehending CO<sub>2</sub>-water-shale interactions and contributes to the development of a cross-scale mechanical model for shale.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"19 ","pages":"Pages 26-46"},"PeriodicalIF":8.2,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000527/pdfft?md5=5ddef8fd3ef4b2908943813aab1854a4&pid=1-s2.0-S2467967424000527-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141142106","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

Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system 地下结构-地下连续墙系统中分段隔离层的抗震和振动控制

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-05-17 DOI: 10.1016/j.undsp.2024.02.002

Zhidong Gao , Mingbo Li , Mi Zhao , Xiuli Du

{"title":"Seismic and vibration control of segmented isolation layer in underground structure-diaphragm wall system","authors":"Zhidong Gao , Mingbo Li , Mi Zhao , Xiuli Du","doi":"10.1016/j.undsp.2024.02.002","DOIUrl":"10.1016/j.undsp.2024.02.002","url":null,"abstract":"<div><p>In this paper, a seismic and vibration reduction measure of subway station is developed by setting a segmented isolation layer between the sidewall of structure and the diaphragm wall. The segmented isolation layer consists of a rigid layer and a flexible layer. The rigid layer is installed at the joint section between the structural sidewall and slab, and the flexible layer is installed at the remaining sections. A diaphragm wall-segmented isolation layer-subway station structure system is constructed. Seismic and vibration control performance of the diaphragm wall-segmented isolation layer-subway station structure system is evaluated by the detailed numerical analysis. Firstly, a three-dimensional nonlinear time-history analysis is carried out to study the seismic response of the station structure by considering the effect of different earthquake motions and stiffness of segmented isolation layer. Subsequently, the vibration response of site under training loading is also studied by considering the influence of different train velocities and stiffness of the segmented isolation layer. Numerical results demonstrate that the diaphragm wall-segmented isolation layer-subway station structure system can not only effectively reduce the lateral deformation of station structure, but also reduce the tensile damage of the roof slab. On the other hand, the developed reduction measure can also significantly reduce the vertical peak displacements of site under training loading.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"19 ","pages":"Pages 72-86"},"PeriodicalIF":8.2,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000539/pdfft?md5=24e30c9c07258b082f76dad6e5a6eda3&pid=1-s2.0-S2467967424000539-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141034395","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

Creep damage constitutive model of rock based on the mechanisms of crack-initiated damage and extended damage 基于裂缝引发损伤和扩展损伤机制的岩石蠕变损伤构成模型

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-05-13 DOI: 10.1016/j.undsp.2023.12.008

Tianbin Li , Chao Chen , Feng Peng , Chunchi Ma , Mou Li , Yixiang Wang

{"title":"Creep damage constitutive model of rock based on the mechanisms of crack-initiated damage and extended damage","authors":"Tianbin Li , Chao Chen , Feng Peng , Chunchi Ma , Mou Li , Yixiang Wang","doi":"10.1016/j.undsp.2023.12.008","DOIUrl":"10.1016/j.undsp.2023.12.008","url":null,"abstract":"<div><p>Since the classical element model cannot describe the nonlinear characteristics of rock during the entire compressive creep process, nonlinear elements and creep damage are generally introduced in the model to resolve this issue. However, several previous studies have reckoned that creep damage in rock only occurs in the accelerated creep stage and is only described by the Weibull distribution. Nevertheless, the creep damage mechanism of rocks is still not clearly understood. In this study, a reasonable representation of the damage variables of solid materials is presented. Specifically, based on the Gurson damage model, the damage state functions reflecting the constant creep stage and accelerated creep stage of rock are established. Further, the one-dimensional and three-dimensional creep damage constitutive equations of rock are derived by modifying the Nishihara model. Finally, the creep-acoustic emission tests of phyllite under different confining pressures are conducted to examine the creep damage characteristics of phyllite. And the proposed constitutive model is verified by analyzing the results of creep tests performed on saturated phyllite. Overall, this study reveals the relationship between the creep characteristics of rocks and the corresponding damage evolution pattern, which bridges the gap between the traditional theory and the quantitative analysis of rock creep and its damage pattern.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"18 ","pages":"Pages 295-313"},"PeriodicalIF":6.4,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000515/pdfft?md5=9a4e987ccdd5acd23ff59fffe64e8457&pid=1-s2.0-S2467967424000515-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141025683","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 of double-arch tunnels under internal BLEVE 内部 BLEVE 条件下的双拱隧道性能

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-05-11 DOI: 10.1016/j.undsp.2024.01.006

Ruishan Cheng , Wensu Chen , Hong Hao

{"title":"Performance of double-arch tunnels under internal BLEVE","authors":"Ruishan Cheng , Wensu Chen , Hong Hao","doi":"10.1016/j.undsp.2024.01.006","DOIUrl":"10.1016/j.undsp.2024.01.006","url":null,"abstract":"<div><p>Double-arch tunnels, as one of the popular forms of tunnels, might be exposed to boiling liquid expanding vapour explosions (BLEVEs) associated with transported liquified petroleum gas (LPG), which could cause damage to the tunnel and even catastrophic collapse of the tunnel in extreme cases. However, very limited study has investigated the performance of double-arch tunnels when exposed to internal BLEVEs and in most analyses of tunnel responses to accidental explosions. The TNT-equivalence method was used to approximate the explosion load, which may lead to inaccurate tunnel response predictions. This study numerically investigates the response of typical double-arch tunnels to an internal BLEVE resulting from the instantaneous rupture of a 20 m<sup>3</sup> LPG tank. Effects of various factors, including in-situ stresses, BLEVE locations, and lining configurations on tunnel responses are examined. The results show that the double-arch tunnels at their early-operation ages are more vulnerable to severe damage when exposed to the BLEVE due to the low action of in-situ stress of rock mass on the response of early-age tunnels. It is also found that directing the LPG tank to different driving lanes inside tunnels can affect the BLEVE-induced tunnel response more significantly than varying the configurations of tunnel lining. Moreover, installing section-steel arches in the mid-wall can effectively improve the blast resistance of the double-arch tunnels against the internal BLEVE. In addition, the prediction models based on multi-variate nonlinear regressions and machine learning methods are developed to predict the BLEVE-induced damage levels of the double-arch tunnels without and with section-steel arches.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"19 ","pages":"Pages 6-25"},"PeriodicalIF":6.4,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000497/pdfft?md5=44f3da29b811f859bfbf28ac4f9ad080&pid=1-s2.0-S2467967424000497-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141028630","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

Prediction of fracture initiation in cohesive soils based on data mining modelling and large-scale laboratory verification 基于数据挖掘建模和大规模实验室验证的粘性土断裂起始预测

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-05-10 DOI: 10.1016/j.undsp.2024.01.007

{"title":"Prediction of fracture initiation in cohesive soils based on data mining modelling and large-scale laboratory verification","authors":"","doi":"10.1016/j.undsp.2024.01.007","DOIUrl":"10.1016/j.undsp.2024.01.007","url":null,"abstract":"<div><p>Many empirical and analytical methods have been proposed to predict fracturing pressure in cohesive soils. Most of them take into account three to four specific influencing factors and rely on the assumption of a failure mode. In this study, a novel data-mining approach based on the XGBoost algorithm is investigated for predicting fracture initiation in cohesive soils. This has the advantage of handling multiple influencing factors simultaneously, without pre-determining a failure mode. A dataset of 416 samples consisting of 14 distinct features was herein collected from past studies, and used for developing a regressor and a classifier model for fracturing pressure prediction and failure mode classification respectively. The results show that the intrinsic characteristics of the soil govern the failure mode while the fracturing pressure is more sensitive to the stress state. The XGBoost-based model was also tested against conventional approaches, as well as a similar machine learning algorithm namely random forest model. Additionally, several large-scale triaxial fracturing tests and an in-situ case study were carried out to further verify the generalization ability and applicability of the proposed data mining approach, and the results indicate a superior performance of the XGBoost model.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"19 ","pages":"Pages 279-300"},"PeriodicalIF":8.2,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000503/pdfft?md5=1186b98abc7e5d3abbd8dd10fd0ac771&pid=1-s2.0-S2467967424000503-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141034726","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

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-05-03 DOI: 10.1016/j.undsp.2024.04.002

Dongming Zhang

引用次数: 0

Introduction to the first Jeme Tien Yow Lecture 首场 "Jeme Tien Yow 讲座 "简介

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-04-29 DOI: 10.1016/j.undsp.2024.04.001

Hehua Zhu

引用次数: 0

Soil conditioning of clay based on interface adhesion mechanism: Microscopic simulation and laboratory experiment 基于界面粘附机制的粘土土壤调理：微观模拟和实验室实验

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-04-26 DOI: 10.1016/j.undsp.2023.12.007

Yong Fang, Bin Zhuo, Ruyue Zhang, Yubo Wang, Liupan Dou, Yuxiang Yao

{"title":"Soil conditioning of clay based on interface adhesion mechanism: Microscopic simulation and laboratory experiment","authors":"Yong Fang, Bin Zhuo, Ruyue Zhang, Yubo Wang, Liupan Dou, Yuxiang Yao","doi":"10.1016/j.undsp.2023.12.007","DOIUrl":"https://doi.org/10.1016/j.undsp.2023.12.007","url":null,"abstract":"<div><p>Clogging frequently occurs in the cutter head, excavation chamber or screw conveyor when an earth pressure balance (EPB) shield machine is tunneling in soft or silty clay ground with high clay mineral content. In this paper, montmorillonite, kaolinite, and illite were selected as research objects, and molecular dynamics (MD) simulation and laboratory experiment were adopted. At the microscopic scale, dynamic contact behavior and interfacial mechanical behavior of the interface between clay minerals and water/surfactant solution was simulated and the interfacial adhesion and conditioning mechanism between clay minerals and water/surfactant solution was revealed. Thus, sodium dodecyl benzene sulfonate (SDBS) surfactant was selected as the main composition of the soil conditioner. Then, the adhesion stress before and after soil conditioning and the contact angles between clay minerals and water/surfactant solution were tested and analyzed at the macroscopic scale. The result shows that the contact angle between droplet and clay mineral surface is an important parameter to characterize soil adhesion. The simulation rules of the microscopic contact angle are consistent with the experiment results. Furthermore, the adsorption energy between microscopic substances is dominated by electrostatic force, which can reflect the adhesion stress between macroscopic substances. Soil adhesion stress can be effectively decreased by adding the surfactant to the soil conditioner.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"18 ","pages":"Pages 239-255"},"PeriodicalIF":6.4,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000461/pdfft?md5=67caadaba449500a75f0cfe6586321b7&pid=1-s2.0-S2467967424000461-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141263856","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

Migration time prediction and assessment of toxic fumes under forced ventilation in underground mines 地下矿井强制通风条件下有毒烟雾的迁移时间预测与评估

IF 6.4 1区工程技术

Underground Space Pub Date : 2024-04-26 DOI: 10.1016/j.undsp.2024.01.004

Jinrui Zhang , Tingting Zhang , Chuanqi Li

{"title":"Migration time prediction and assessment of toxic fumes under forced ventilation in underground mines","authors":"Jinrui Zhang , Tingting Zhang , Chuanqi Li","doi":"10.1016/j.undsp.2024.01.004","DOIUrl":"https://doi.org/10.1016/j.undsp.2024.01.004","url":null,"abstract":"<div><p>This study aims to predict the migration time of toxic fumes induced by excavation blasting in underground mines. To reduce numerical simulation time and optimize ventilation design, several back propagation neural network (BPNN) models optimized by honey badger algorithm (HBA) with four chaos mapping (CM) functions (i.e., Chebyshev (Che) map, Circle (Cir) map, Logistic (Log) map, and Piecewise (Pie) map) are developed to predict the migration time. 125 simulations by the computational fluid dynamics (CFD) method are used to train and test the developed models. The determination coefficient (<em>R</em><sup>2</sup>), the variance accounted for (VAF), the Willmott’s index (WI), the root mean square error (RMSE), the mean absolute percentage error (MAPE), and the sum of squares error (SSE) are utilized to evaluate the model performance. The evaluation results indicate that the CirHBA-BPNN model has achieved the most satisfactory performance by reaching the highest values of <em>R</em><sup>2</sup> (0.9945), WI (0.9986), VAF (99.4811%), and the lowest values of RMSE (15.7600), MAPE (0.0343) and SSE (6209.4), respectively. The wind velocity in roadway (<em>W</em><sub>v</sub>) is the most important feature for predicting the migration time of toxic fumes. Furthermore, the intrinsic response characteristic of the optimal model is implemented to enhance the model interpretability and provide reference for the relationship between features and migration time of toxic fumes in ventilation design.</p></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"18 ","pages":"Pages 273-294"},"PeriodicalIF":6.4,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2467967424000448/pdfft?md5=fdbe69eadbfc36a8f4bfb03ecbe3f1db&pid=1-s2.0-S2467967424000448-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141286403","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

Analytical model regarding compression-bending capacity of segmental joint reinforced by steel plate 钢板加固节段连接的抗压抗弯能力分析模型

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-04-26 DOI: 10.1016/j.undsp.2024.01.005

Zhen Li , Xuezeng Liu

{"title":"Analytical model regarding compression-bending capacity of segmental joint reinforced by steel plate","authors":"Zhen Li , Xuezeng Liu","doi":"10.1016/j.undsp.2024.01.005","DOIUrl":"10.1016/j.undsp.2024.01.005","url":null,"abstract":"<div><div>The mechanical properties of the steel-plate-reinforced segmental lining are generally determined by the load-bearing capacity of reinforced joints. However, there is a lack of valid calculation methods for compression-bending bearing capacity, and researchers mainly rely on experience and analogy for the design of reinforced joints. This paper proposes an analytical model based on the deformation and stress characteristics of the joint surface to calculate the compression-bending capacity of the steel-plate-reinforced joint. After verifying the applicability of this analytical model through finite element simulations, the evalution rules of the load-bearing capacity of the reinforced joint were attained, followed by a quantitative investigation into the influence of joint parameters on it. The results show that: (1) the bearing capacity curve of the reinforced joint under different axial forces can be separated into two parts, with the maximum ultimate bending moment found at the demarcation point, where the steel plate yielding and joint failure occur simultaneously; (2) the steel plate strength and cross-sectional area have a strong influence on the bearing capacity of the reinforced joint when the axial force is under 0.15RFF, where RFF is the axial force at pure-compression failure); (3) the concrete strength and segment width have a prominent influence on the curve when the axial force is over 0.30RFF; (4) the impact of the fictitious strain, bolt strength, bolt diameter, and bolt location on the bearing capacity is minimal in range and amplitude.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 157-173"},"PeriodicalIF":8.2,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418474","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