Underground Space最新文献_第2页

Numerical studies on the synergistic effects of smoke extraction and control performance by mechanical ventilation shafts during tunnel fires 隧道火灾中机械通风井排烟和控制性能协同效应的数值研究

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-27 DOI: 10.1016/j.undsp.2024.07.005

Bin Zhu , Haiyong Cong , Zhuyu Shao , Hairuo Hu , Lili Ye , Yubo Bi , Yiping Zeng

{"title":"Numerical studies on the synergistic effects of smoke extraction and control performance by mechanical ventilation shafts during tunnel fires","authors":"Bin Zhu , Haiyong Cong , Zhuyu Shao , Hairuo Hu , Lili Ye , Yubo Bi , Yiping Zeng","doi":"10.1016/j.undsp.2024.07.005","DOIUrl":"10.1016/j.undsp.2024.07.005","url":null,"abstract":"<div><div>High smoke extraction efficiency and a relatively stable smoke layer stratification are both expected in tunnel ventilation systems. The purpose of this paper is to explore the overall performance of mechanical board-coupled shaft under different ventilation strategies. A total of 57 simulations were conducted, and the effects of the distance between the shaft and board (<span><math><mrow><msub><mi>h</mi><mi>D</mi></msub></mrow></math></span>) and ventilation velocity on the overall performance were investigated. The results indicate that the performance of smoke extraction and control will be improved by the application of mechanical ventilation and board. Smoke movement patterns under different working conditions were different, for cases of <span><math><mrow><msub><mi>h</mi><mi>D</mi></msub><mo>≤</mo><mn>0.40</mn><mspace></mspace><mi>m</mi></mrow></math></span> the smoke could propagate through the whole tunnel without backflow, while for cases of <span><math><mrow><msub><mi>h</mi><mi>D</mi></msub><mo>></mo><mn>0.40</mn><mspace></mspace><mi>m</mi></mrow></math></span>, the backflow exists and the smoke movement can be separated into three periods (propagation, stagnation, and retraction). The critical criterion of backflow was investigated and a simple model was deduced to estimate the maximum propagation length. Moreover, the dimensionless time for the smoke flow to reach its maximum propagation length was established. Finally, a comprehensive index <span><math><mrow><mi>φ</mi></mrow></math></span> was proposed to evaluate the synergistic effects of smoke extraction and control performance. These studies may provide positive significance for the ventilation design.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"21 ","pages":"Pages 44-64"},"PeriodicalIF":8.2,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656029","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

Coal-rock interface real-time recognition based on the improved YOLO detection and bilateral segmentation network 基于改进的 YOLO 检测和双边分割网络的煤岩界面实时识别技术

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-26 DOI: 10.1016/j.undsp.2024.07.003

Shuzhan Xu , Wanming Jiang , Quansheng Liu , Hongsheng Wang , Jun Zhang , Jinlong Li , Xing Huang , Yin Bo

{"title":"Coal-rock interface real-time recognition based on the improved YOLO detection and bilateral segmentation network","authors":"Shuzhan Xu , Wanming Jiang , Quansheng Liu , Hongsheng Wang , Jun Zhang , Jinlong Li , Xing Huang , Yin Bo","doi":"10.1016/j.undsp.2024.07.003","DOIUrl":"10.1016/j.undsp.2024.07.003","url":null,"abstract":"<div><div>To improve the accuracy and efficiency of coal-rock interface recognition, this study proposes a model built on the real-time detection algorithm, you only look once (YOLO), and the lightweight bilateral segmentation network. Simultaneously, the regional similarity transformation function and dragonfly algorithm are introduced to enhance the quality of coal-rock images. The comparison with three other models demonstrates the superior edge inference performance of the proposed model, achieving a mean Average Precision (mAP) of 90.2 at the Intersection over Union (IoU) threshold of 0.50 (mAP<sub>50</sub>) and 81.4 across a range of IoU thresholds from 0.50 to 0.95 (mAP<sub>[50,95]</sub>). Furthermore, to maintain high accuracy and real-time recognition capabilities, the proposed model is optimized using the open visual inference and neural network optimization toolkit, resulting in a 144.97% increase in the mean frames per second. Experimental results on four actual coal faces confirm the efficacy of the proposed model, showing a better balance between accuracy and efficiency in coal-rock image recognition, which supports further advancements in coal mining intelligence.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"21 ","pages":"Pages 22-43"},"PeriodicalIF":8.2,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656028","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

Experimental investigation on damage development and failure mechanism of shield tunnel lining under internal blast considering stratum-structure interaction 考虑地层-结构相互作用的盾构隧道衬砌在内部爆破下的损伤发展和破坏机理的实验研究

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-26 DOI: 10.1016/j.undsp.2024.07.004

Chao Liu , Guanhua Zhao , Yijie Liu , Jie Cui , Hai Liu , Shunhang Zhu

{"title":"Experimental investigation on damage development and failure mechanism of shield tunnel lining under internal blast considering stratum-structure interaction","authors":"Chao Liu , Guanhua Zhao , Yijie Liu , Jie Cui , Hai Liu , Shunhang Zhu","doi":"10.1016/j.undsp.2024.07.004","DOIUrl":"10.1016/j.undsp.2024.07.004","url":null,"abstract":"<div><div>With the expansion of international terrorism and the potential threat of attacks against civil infrastructure, the dynamic response and failure modes of underground tunnels under explosive loads have become a prominent research topic. The high cost and inherent danger associated with explosion experiments have limited current research on tunnel internal explosions, particularly in the context of scaled model tests of shield tunnels. This study presents a series of scaled model tests under 1<em>g</em>-condition simulating internal blast events within a shield tunnel based on the prototype of the Shantou Bay Tunnel, considering the influences of surrounding stratum and equivalent explosive yield. Three different TNT explosive yields are considered in the model tests, namely 0.2, 0.4, and 1.0 kg. The model tests focus on the damage behavior and collapse modes of the shield tunnel lining under internal explosive loads. The model tests reveal that the shield tunnel is prone to damage at the joints of the tunnel crown and shoulder when subjected to internal explosive loads, with the upper half of the tunnel lining experiencing segment collapse, while the lower half remains largely undamaged. As the TNT equivalent increases, the damage area at the tunnel joints expands, and the number of segment failures in the upper half of the tunnel rises, transitioning from a damaged state to a collapsed state. The influence of “stratum-structure” interaction is investigated by comparing two models, one with overburden soil and the other positioned at the ground surface. The model tests reveal that the presence of soil pressure and confinement can significantly enhance the tunnel resistance to internal blast loads. Based on the observation of the model tests, five different damage modes of segment joints under internal explosion are proposed in this study.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"21 ","pages":"Pages 81-99"},"PeriodicalIF":8.2,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656030","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

RM2D: An automated and robust laser-based framework for mobile tunnel deformation detection RM2D：基于激光的移动隧道变形自动稳健检测框架

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-16 DOI: 10.1016/j.undsp.2024.07.002

Boxun Chen , Ziyu Zhao , Lin Bi , Zhuo Wang

{"title":"RM2D: An automated and robust laser-based framework for mobile tunnel deformation detection","authors":"Boxun Chen , Ziyu Zhao , Lin Bi , Zhuo Wang","doi":"10.1016/j.undsp.2024.07.002","DOIUrl":"10.1016/j.undsp.2024.07.002","url":null,"abstract":"<div><div>As mining operations extend to greater depths, the risk of deformation in high-stress tunnels increases significantly, posing a substantial threat. This study introduces a novel framework known as “robust mobility deformation detection” (RM2D), designed for real-time tunnel deformation detection. RM2D employs mobile LiDAR scanner to capture real-time point cloud data within the tunnel. This data is then voxelized and analyzed using covariance matrices to create a voxel-based multi-distribution representation of the rugged tunnel surface. Leveraging this representation, we assess deformations and scrutinize results through machine learning models to swiftly pinpoint tunnel deformation locations. Extensive experimental validation confirms the framework’s capacity to successfully detect deformations, including floor heave, side rib spalling, and roof fall, with remarkable accuracy. For deformation levels at 0.15 m, RM2D was able to successfully detect deformations with an area greater than 2 m<sup>2</sup>. For deformation areas of (3 ± 0.5) m<sup>2</sup>, RM2D successfully detected deformations of levels at (0.05 ± 0.01) m, and its detection capability meets the standard criteria for mining tunnel deformation detection. When compared to two conventional methods, RM2D demonstrates its real-time deformation detection capability in complex environments and on rough surfaces with precision, all at speeds below 10 km/h. Furthermore, we evaluated the predictive performance using multiple evaluation metrics and provided insights into the decision mechanism of the machine learning employed in our research, thereby offering valuable information for practical engineering applications in tunnel deformation detection.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 241-258"},"PeriodicalIF":8.2,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327068","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

Lightweight defocus deblurring network for curved-tunnel line scanning using wide-angle lenses 使用广角镜头进行曲线隧道线扫描的轻量级去焦模糊网络

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-13 DOI: 10.1016/j.undsp.2024.06.005

Shaojie Qin , Taiyue Qi , Xiaodong Huang , Xiao Liang

{"title":"Lightweight defocus deblurring network for curved-tunnel line scanning using wide-angle lenses","authors":"Shaojie Qin , Taiyue Qi , Xiaodong Huang , Xiao Liang","doi":"10.1016/j.undsp.2024.06.005","DOIUrl":"10.1016/j.undsp.2024.06.005","url":null,"abstract":"<div><div>High-resolution line scan cameras with wide-angle lenses are highly accurate and efficient for tunnel detection. However, due to the curvature of the tunnel, there are variations in object distance that exceed the depth of field of the lens, resulting in uneven defocus blur in the captured images. This can significantly affect the accuracy of defect recognition. While existing deblurring algorithms can improve image quality, they often prioritize results over inference time, which is not ideal for high-speed tunnel image acquisition. To address this issue, we developed a lightweight tunnel structure defect deblurring network (TSDDNet) for curved-tunnel line scanning with wide-angle lenses. Our method employs an innovative progressive structure that balances network depth and feature breadth to simultaneously achieve good performance and short inference time. The proposed depthwise ResBlocks significantly improves the parameter efficiency of the network. Additionally, the proposed feature refinement block captures the structurally similar features to enhance the image details, increasing the peak signal-to-noise ratio (PSNR). A raw dataset containing tunnel blur images was created using a high-resolution line scan camera and used to train and test our model. TSDDNet achieved a PSNR of 26.82 dB and a structural similarity index measure of 0.888, while using one-third of the parameters of comparable alternatives. Moreover, our method exhibited a higher computational speed than that of conventional methods, with inference times of 8.82 ms for a single 512 × 512 pixels image patch and 227.22 ms for completely processing a 2048 × 2560 pixels image. The test results indicated that the structural scalability of the network allows it to accommodate large inputs, making it effective for high-resolution images.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 218-240"},"PeriodicalIF":8.2,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142327181","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

Experimental investigation on the failure characteristic and synergistic load-bearing mechanism of multi-layer linings for deep soft rock tunnels 深层软岩隧道多层衬砌的破坏特征和协同承载机理的试验研究

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-07 DOI: 10.1016/j.undsp.2024.06.004

Haibo Wang , Fuming Wang , Chengchao Guo , Lei Qin , Jun Liu , Tongming Qu

{"title":"Experimental investigation on the failure characteristic and synergistic load-bearing mechanism of multi-layer linings for deep soft rock tunnels","authors":"Haibo Wang , Fuming Wang , Chengchao Guo , Lei Qin , Jun Liu , Tongming Qu","doi":"10.1016/j.undsp.2024.06.004","DOIUrl":"10.1016/j.undsp.2024.06.004","url":null,"abstract":"<div><div>Multi-layer linings have been widely used in deep rheological soft rock tunnels for the excellent performance in preventing large-deformation hazards. Previous studies have focused on the bearing capability of multi-layer lining, however, its failure characteristics and synergistic load-bearing mechanisms under high geo-stress are still unclear. To fill the gap, three-dimensional geomechanical model tests were conducted and synergistic mechanisms were analysed in this study. The model test was divided into normal loading, excavating, and overloading stages. The surrounding rock deformation was monitored by using an improved high-precise extensometer measurement system. Results show that the largest radial deformation appears on the sidewall, followed by the floor and vault during the excavating stage. The relative convergence deformation of sidewalls springing reaches 1.32 mm. The failure characteristics of the multi-layer linings during the overloading stage undergo an evolution of stability, crack initiation, local failure, and collapse, with a safety factor of 1.0–1.6, 1.6–2.0, and 2.0–2.2, respectively. The synergistic load-bearing mechanism analysis results suggest that the early stiffness and late yielding deformation capacity of large deformation support measures play important roles in stability maintenance both in the construction and operation of deep soft rock tunnels. Therefore, the combination of yielding support or a compressible layer with reinforced support is recommended to mitigate the effect of the high geo-stress.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 259-276"},"PeriodicalIF":8.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358047","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

Full-scale loading test for shield tunnel segments: Load-bearing performance and failure patterns of lining structures 盾构隧道分段全尺寸加载试验：衬砌结构的承载性能和破坏模式

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-07 DOI: 10.1016/j.undsp.2024.05.003

Gang Wei , Feifan Feng , Shiyu Huang , Tianbao Xu , Jiaxuan Zhu , Xiao Wang , Chengwei Zhu

{"title":"Full-scale loading test for shield tunnel segments: Load-bearing performance and failure patterns of lining structures","authors":"Gang Wei , Feifan Feng , Shiyu Huang , Tianbao Xu , Jiaxuan Zhu , Xiao Wang , Chengwei Zhu","doi":"10.1016/j.undsp.2024.05.003","DOIUrl":"10.1016/j.undsp.2024.05.003","url":null,"abstract":"<div><div>To explore the load-bearing performance and the failure patterns of the lining structures, a full-scale loading test on the three-ring staggered assembled shield tunnel segments is carried out through a hydraulic loading system. In the experimental study, the segments’ internal force, convergence deformation, and displacement, and the bolts’ internal force, are analyzed. According to the experimental results, the relationship between internal force and deformation is obtained to determine the residual bearing capacity of the shield tunnel at each stage. Three stages are specified for the evolution of the segment’s maximum bending moment during the loading process, in which, the elastic stage is the main and longest stage, in which the bending moment of the segment increases the most. There are two stages for convergence deformation development and segment misalignment development. At the end of loading, the segment’s maximum positive and negative convergence values reach 61.22 and −57.69 mm, respectively. Besides, the maximum segment misalignment is 3.67 mm, which occurs in the direction of 90°. The segment cracks when its maximum convergence value reaches 25.03 mm. Moreover, there are signs of fracturing on the waist joint of the segment when its maximum convergence value reaches 32.73 mm. The concrete at the waist joint starts fracturing in pieces when the segment’s maximum convergence value reaches 38.93 mm, which is defined as the type of shear failure. Finally, the bearing capacity of shield tunnels during segment failure period can be evaluated by using the corresponding relationship between deformation and internal force.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 197-217"},"PeriodicalIF":8.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319042","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

Grain-based coupled thermo-mechanical modeling for stressed heterogeneous granite under thermal shock 热冲击下受力异质花岗岩的基于晶粒的热机械耦合建模

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-09-07 DOI: 10.1016/j.undsp.2024.06.003

Zheng Yang , Ming Tao , Wenbin Fei , Tubing Yin , P.G. Ranjith

{"title":"Grain-based coupled thermo-mechanical modeling for stressed heterogeneous granite under thermal shock","authors":"Zheng Yang , Ming Tao , Wenbin Fei , Tubing Yin , P.G. Ranjith","doi":"10.1016/j.undsp.2024.06.003","DOIUrl":"10.1016/j.undsp.2024.06.003","url":null,"abstract":"<div><div>Microscopic damage and macroscopic mechanical properties of granite under the coupling effect of thermal load and initial stress are crucial considerations for the safe construction of underground geo-energy engineering. However, visualizing real-time micro-crack processes in rocks under high-temperature and high-pressure conditions using the current experimental techniques remains challenging. In this study, a numerical method is developed to analyze the thermally induced damage in heterogeneous granite under the coupled influence of initial stress and thermal loading. A biaxial thermo-mechanical grain-based model considering real mineral distribution is established based on digital image processing technology, the grain-based modeling method, and heat conduction theory. The microscopic parameters are calibrated and the effectiveness of the model is verified based on thermal shock and uniaxial compression experiments. The thermal destruction mechanism of granite under initial stress from a microscopic perspective was unveiled for the first time. During the thermal shock process, the stress within the rock does not remain constant at the initial stress value. Instead, it changes continuously with the progression of heat conduction. The impact of the initial stress on the thermally induced cracks is relatively minor. Cooling causes more damage to the rock than heating during thermal shock. The intragranular cracks of quartz consistently outnumber other intragranular or intergranular cracks during thermal shock. The initial stress and thermal shock damage enhance and weaken the biaxial peak strength of granite, respectively. The weakening effect of thermal shock on the peak strength becomes more pronounced at a higher initial stress. These research findings and proposed research techniques contribute to the management and optimization of underground geo-energy engineering.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 174-196"},"PeriodicalIF":8.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319041","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

Experimental study on the performance of shield tunnel tail grout in ground 盾构隧道尾部注浆在地层中的性能试验研究

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-08-29 DOI: 10.1016/j.undsp.2024.07.001

Jiaxin Liang , Wei Liu , Xinsheng Yin , Wentao Li , Zhe Yang , Jichen Yang

{"title":"Experimental study on the performance of shield tunnel tail grout in ground","authors":"Jiaxin Liang , Wei Liu , Xinsheng Yin , Wentao Li , Zhe Yang , Jichen Yang","doi":"10.1016/j.undsp.2024.07.001","DOIUrl":"10.1016/j.undsp.2024.07.001","url":null,"abstract":"<div><div>Shield tail grouting is an important measure to control tunnelling-induced ground deformation by injecting prepared grouting materials to fill the tail gap. The working performance of grout is usually invisible and hard to obtain in construction. This paper carries out an experimental study to investigate the tail grout behavior in ground. In the current research, a testing device is developed to explore the grout behavior in varying soils. The grout working performance is evaluated not only by the liquid grout properties such as fluidity, consistency, bleeding rate, stone rate and compressed deformation but also solid grout properties such as unconfined compressive strength and permeability. Three typical grouts are chosen and their behaviors in the various soils are observed. To take an insight on the behaviors, scanning electron microscopy and mercury intrusion porosimetry analysis are employed. The microstructure of solid grout is a sign of its working performance. The observation shows that the solid grout micro-structure is influenced by grout proportions, pressure, and ground permeabilities. The experimental results are applied in the case of Beijing Metro Line 12 for validation and as a result, the ground movement is inhibited due to high performance of tail grout.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 277-292"},"PeriodicalIF":8.2,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418475","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

Novel multifractal-based classification model for the quality grades of surrounding rock within tunnels 基于多分形的隧道围岩质量等级分类新模型

IF 8.2 1区工程技术

Underground Space Pub Date : 2024-08-29 DOI: 10.1016/j.undsp.2024.06.002

Junjie Ma , Tianbin Li , Zhen Zhang , Roohollah Shirani Faradonbeh , Mostafa Sharifzadeh , Chunchi Ma

{"title":"Novel multifractal-based classification model for the quality grades of surrounding rock within tunnels","authors":"Junjie Ma , Tianbin Li , Zhen Zhang , Roohollah Shirani Faradonbeh , Mostafa Sharifzadeh , Chunchi Ma","doi":"10.1016/j.undsp.2024.06.002","DOIUrl":"10.1016/j.undsp.2024.06.002","url":null,"abstract":"<div><div>Understanding the variation patterns of tunnel boring machine (TBM) operational parameters is crucial for assessing engineering geological conditions and quality grades of surrounding rock within tunnels. Studying the multifractal characteristics of the TBM operational parameters can help identify the patterns, but the relevant research has not yet been explored. This paper proposed a novel classification model for quality grades of surrounding rock in TBM tunnels based on multifractal analysis theory. Initially, the statistical characteristics of eight TBM cycle data with different grades of surrounding rock were explored. Subsequently, the method of calculating and analyzing the multifractal characteristic parameters of the TBM operational data was deduced and summarized. The research results showed that the TBM operational parameters of cutterhead torque, total thrust, advance rate, and cutterhead rotation speed have significant multifractal characteristics. Its multifractal dimension, midpoint slope of the generalized fractal spectrum, and singularity strength range can be used to evaluate the surrounding rock grades of the tunnel. Finally, a novel classification model for the tunnel surrounding rocks based on the multifractal characteristic parameters was proposed using the multiple linear regression method, and the model was verified through four TBM cycle data containing different surrounding rock grades. The results showed that the proposed multifractal-based classification model for tunnel surrounding rocks has high accuracy and applicability. This study not only achieves multifractal feature representation and surrounding rock classification for TBM operational parameters but also holds the potential for adaptive adjustment of TBM operational parameters and automated tunneling applications.</div></div>","PeriodicalId":48505,"journal":{"name":"Underground Space","volume":"20 ","pages":"Pages 140-156"},"PeriodicalIF":8.2,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319040","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