Tunnelling and Underground Space Technology最新文献

{"title":"Risk assessment of shield construction adjacent to the existing shield tunnel based on improved nonlinear FAHP","authors":"Desai Guo ,&nbsp;Fanyan Meng ,&nbsp;Huaina Wu ,&nbsp;Xinxin Yang ,&nbsp;Renpeng Chen","doi":"10.1016/j.tust.2024.106154","DOIUrl":"10.1016/j.tust.2024.106154","url":null,"abstract":"<div><div>To solve the problem that the traditional fuzzy Analytic Hierarchy Process (FAHP) cannot reflect the influence of prominent risk indexes on the evaluation results, a new risk assessment model of shield construction adjacent to the existing shield tunnel was established by introducing nonlinear operators into the traditional FAHP. A risk assessment index system including 5 primary risk indexes and 21 secondary risk indexes and risk assessment criteria were established for shield construction adjacent to the existing shield tunnel. The game theory was used to calculate the combination weights, which comprehensively consider the advantages of subjective and objective weights. The certainty was obtained through cloud model calculation, and then the membership degree vector was obtained to construct the fuzzy relationship matrix. Introducing nonlinear operators to comprehensively analyze the weights and fuzzy relationship matrices. Based on the principle of maximum membership degree, the final risk level result was obtained. The new model was applied to a case study of the risk assessment of shield construction of Changsha Metro Line 2, which is adjacent to Changsha Metro Line 4. The results show that: (a) The risk levels of sample 1 and sample 3 were level Ⅲ and sample 2 was level Ⅱ. The result was consistent with the actual situation which validates the applicability and accuracy of the employed methodology. (b) Compared with the traditional FAHP, the new risk assessment model adequately reflected the prominent impact of adverse risk indexes on risk assessment. Therefore, the new model maximizes the assurance of the rationality of the risk assessment results, which can be feasibly used in applications and guide other similar projects.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106154"},"PeriodicalIF":6.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the longitudinal performance of shield tunnel from settlement to joint behavior by a novel physical modeling system","authors":"Yu-shan Hua,&nbsp;Dong-ming Zhang,&nbsp;Hong-wei Huang","doi":"10.1016/j.tust.2024.106149","DOIUrl":"10.1016/j.tust.2024.106149","url":null,"abstract":"<div><div>Apart from the settlement trough, the joint behavior in terms of dislocation and opening plays a pivotal role in determining the longitudinal performance of shield tunnel, while they have been less tackled neither on the site nor in the scaled test system. This paper proposes a novel physical modeling system with the emphasis on capturing both the longitudinal settlement trough and circumferential joint behavior of shield tunnel in one test. The test results have been compared with field data, exhibiting similar trends and magnitudes of change. Utilizing this newly proposed test system, relationship between joint dislocation and opening under differential settlement trough is closely revisited and the proportion of these two joint behaviors could be revealed as the responses to the maximum settlement of the troughs. Results show that the development of dislocation between rings is more prominent than joint opening at a small level of settlement and a higher proportion of joint opening would occur as the settlement increases. Besides, a modest linear correlation between the differential settlement and joint dislocation is observed, whereas no clear correlation is evident between the differential settlement and joint opening. Additionally, the paper discusses the adjustments for sensor position when utilizing this system to measure the tunnel heave or radial joint deformation. Overall, the good working performance and high measuring accuracy of the physical modeling system can enable more precise evaluations of tunnel deformation and refined structural behavior under various conditions.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106149"},"PeriodicalIF":6.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance evaluation of novel energy-absorbing anchor cables with expansion–friction structures for supporting roadways prone to rock bursts","authors":"Dewei Fan ,&nbsp;Aiwen Wang ,&nbsp;Lianpeng Dai ,&nbsp;Yishan Pan ,&nbsp;Shankun Zhao ,&nbsp;Xinhe Yu","doi":"10.1016/j.tust.2024.106158","DOIUrl":"10.1016/j.tust.2024.106158","url":null,"abstract":"<div><div>The powerful impact generated by a rock burst in a coal mine roadway can easily cause ordinary steel strand anchor cables to break, detach, and deform. To address these issues, an expansion–friction energy-absorbing structure designed for installation on ordinary steel strand anchor cables was developed, establishing a novel type of energy-absorbing anchor cable. To investigate the macroscopic deformation characteristics and mechanical properties of the expansion–friction structure and evaluate its performance, static tests were conducted on a 5000 kN servo press. The research results indicate that this energy-absorbing structure possesses dual energy absorption characteristics, namely, plastic expansion deformation and frictional sliding energy dissipation. The deformation characteristics manifest as symmetrical plastic deformation and stable friction deformation and exhibit strong controllability, repeatability, and energy absorption stability. In general, as the cone angle and expansion increase, the deformation of the energy-absorbing structure becomes more pronounced. From the perspective of constant resistance, as the cone angle and expansion increase, the constant resistance gradually increases. The stability of the constant resistance is best at cone angles of 10° and 15° and expansion amounts of 0.5 and 1.5 mm, respectively. Based on the principle of energy absorption, an evaluation index for the mechanical performance of the energy-absorbing structure is proposed. The analysis revealed that the constant resistance, unit displacement energy absorption, and total energy absorption ranges of the expansion–friction energy-absorbing structure are 139.60 to 652.88 kN, 0.41 to 0.61 kJ/mm, and 34.25 to 149.25 kJ, respectively. Therefore, it exhibits good static load control and dynamic load energy absorption mechanical performance. This structure can reduce the probability of impact failure that arises with ordinary anchor cables, thereby improving the stability control effect of energy-absorbing and anti-impact anchor cables on the rock surrounding the roadway and achieving effective control of roadway rock bursts.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106158"},"PeriodicalIF":6.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterizing water-bearing structure ahead of tunnel using full-decay induced polarization based on the fuzzy C-means clustering method","authors":"Lichao Nie ,&nbsp;Zhaoyang Deng ,&nbsp;Zhi-Qiang Li ,&nbsp;Zhicheng Song ,&nbsp;Shaoyang Dong","doi":"10.1016/j.tust.2024.106159","DOIUrl":"10.1016/j.tust.2024.106159","url":null,"abstract":"<div><div>The application of full-decay induced polarization offers additional potential to characterize water-bearing structures. The method enables inversion imaging of four parameters: zero-frequency resistivity, intrinsic polarizability, relaxation time, and frequency-dependent coefficient. Due to the inherent volume effect in electrical exploration, the inversion results often fail to accurately depict the scale of water-bearing structures. To address this limitation, we introduce the fuzzy C-means clustering constraint into the objective function of the full-decay induced polarization inversion. We propose a multi-parameter inversion method for full-decay induced polarization based on fuzzy C-means clustering. To address the inconsistent resolution of anomalies by each induced polarization parameter, we apply different constraints to the sensitivity matrix of each parameter, thereby balancing the resolution of anomalies across parameters. The four parameters are normalized to solve the problem of large order of magnitude gap between different parameters. Inversion imaging numerical simulations of typical water-bearing structures are carried out, and the results showed that the proposed tunnel full-decay induced polarization inversion method based on fuzzy C-mean clustering could effectively depict the position and morphology of the water-bearing structures. Additionally, an on-site application was carried out in the Yinchaojiliao Water Diversion Project, effectively identifying the water body in front of the tunnel face and guiding the on-site construction of the project. The tunnel full-decay induced polarization inversion method based on fuzzy C-mean clustering has the ability to locate and depict boundaries of water-bearing structures with high accuracy.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106159"},"PeriodicalIF":6.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical behaviour of double lining with outer segmental lining and inner fibre reinforced concrete lining under internal water pressure","authors":"Wen-Ding Zhou ,&nbsp;Dong-Mei Zhang ,&nbsp;Xiang-Hong Bu ,&nbsp;Xiao-Hu Wang","doi":"10.1016/j.tust.2024.106151","DOIUrl":"10.1016/j.tust.2024.106151","url":null,"abstract":"<div><div>Double lining with outer segmental lining and inner reinforced concrete lining is extensively used for water conveyance tunnel with internal water pressure. In order to improve the performance of the double lining, the steel rebar and fibre reinforced concrete (R/FRC) is designed for inner lining to enhance the tensile strength of reinforced concrete (RC). Full-scale tests were conducted to compare the mechanical behaviour of double lining with inner RC and R/FRC linings. The test results showed that both types of lining failed in four stages: elastic stage, inner lining cracking stage, crack stabilization and segmental joint damage stage, and failure stage. The cracks firstly occurred in the inner lining near the segmental joints and then propagated to the whole inner lining ring. Finally, the crack width and segmental joint opening successively exceeded the thresholds, and the double lining failed until the breaking of segmental joints. Compared with inner RC lining, R/FRC lining had better performance in terms of the initial cracking load, cracking-control ability, post-cracking stiffness, service limit capacity of inner lining and waterproof capacity of segmental lining. The improvement ratios were 36.3%, 50.3%, 46.3%, 37.2% and 31.1%, respectively. The influences of fibre volume fraction, fibre aspect ratio, and reinforcement ratio of steel rebar on the mechanical performance of R/FRC lining were also investigated based on a previously proposed analytical model. The parametric analysis demonstrated that higher fibre volume fraction and fibre aspect ratio can result in more significant increase of mechanical performance of R/FRC lining. The steel fibres were found to have more significant effects on the post-cracking behaviour of the lining than same amounts of reinforcing bars. Finally, an optimized function was proposed to fulfil a balance of lining performance and economy. The experimental and analytical results indicated that R/FRC lining can substitute RC lining and perform higher mechanical performance in water conveyance tunnels.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106151"},"PeriodicalIF":6.7,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing gas drainage and ventilation efficiency in underground coal mines: A hybrid expert decision approach for booster fan prioritization","authors":"Abiodun Ismail Lawal ,&nbsp;Moshood Onifade ,&nbsp;Sangki Kwon ,&nbsp;Manoj Khandelwal","doi":"10.1016/j.tust.2024.106153","DOIUrl":"10.1016/j.tust.2024.106153","url":null,"abstract":"<div><div>Expanding mining operations in goaf zones heightens gas production potential, posing challenges in maintaining adequate ventilation within development panels, consequently impacting coal production. Various strategies have been explored to enhance mine ventilation and gas drainage effectiveness. However, deficiencies persist in the proposed ventilation system for the Okaba underground coal mine, prompting this study’s necessity. Addressing these concerns, the study evaluates the feasibility of employing booster fans to mitigate the identified drawbacks. Prioritizing booster fans for airflow distribution in underground mines is a complex decision-making process, requiring an advanced expert system approach. To address this, the study proposes an intuitionistic-based fuzzy TOPSIS (IFT) method for booster fan prioritization in the Okaba mine. Results indicate that booster fan 4 (BF4) ranks highest, followed by booster fan 3 (BF3), consistent with fuzzy TOPSIS findings. Sensitivity analysis supports the predicted importance order, affirming the efficacy of the hybrid expert decision method in selecting a booster fan capable of enhancing the overall efficiency of gas drainage and ventilation systems in underground mines. This study introduces a Hybrid Expert Decision Approach that integrates IFT and traditional fuzzy TOPSIS methodologies. This hybrid approach is particularly novel because it combines the strengths of both methods to prioritize booster fans in underground coal mines.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106153"},"PeriodicalIF":6.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532993","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}

{"title":"Dynamic resilience assessment and multi-objective optimization decision-making for urban roadway tunnel system in the face of fire disaster","authors":"Honglei Sun ,&nbsp;Huijun Lan ,&nbsp;Zili He ,&nbsp;Xiaodong Pan ,&nbsp;Ranran Zhang ,&nbsp;Pengfei Zhang ,&nbsp;Junhao Tong","doi":"10.1016/j.tust.2024.106120","DOIUrl":"10.1016/j.tust.2024.106120","url":null,"abstract":"<div><div>The urban roadway tunnel system (URTS), as an infrastructure system that includes equipment and facilities, operational staff, and traffic participants, faces challenges arising from various potential fire threats. Existing studies on tunnel fire risk primarily focus on static assessment, neglecting dynamic changes over time, and insufficiently considering the complexity of tunnel composition, leading to incomplete identification of influential factors. Additionally, few studies were conducted to develop optimal operation and maintenance (O&amp;M) strategies under cost constraints. To bolster fire safety management of URTS, a fire framework that combines resilience assessment and optimization is proposed based on system resilience theory, Bayesian network (BN), and multi-objective optimization (MOPT) in this paper. The framework is applied to Hangzhou’s URTS. The results indicate that Hangzhou’s URTS has a current “Medium” fire resilience level of 0.640, decreasing to 0.568 in 20 years without scientific O&amp;M. The static and dynamic strategies are acquired through sensitivity and critical importance analysis, enhancing long-term fire resilience. Moreover, optimal strategies for varied investments in diverse periods are explored, considering O&amp;M costs and resilience levels. The fire resilience framework introduced herein can integrate into various infrastructure systems, effectively enhancing disaster resilience and promoting sustainable development.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106120"},"PeriodicalIF":6.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the axial performance of protective sheathed rock bolts through large-scale testing","authors":"Hadi Nourizadeh ,&nbsp;Ali Mirzaghorbanali ,&nbsp;Kevin McDougall ,&nbsp;Naj Aziz","doi":"10.1016/j.tust.2024.106157","DOIUrl":"10.1016/j.tust.2024.106157","url":null,"abstract":"<div><div>Understanding the axial load transfer mechanism of rock bolts under diverse conditions is essential for optimizing reinforcement in rock structures, advancing our comprehension of rock support, and facilitating the design of robust engineering solutions. This paper reports the outcomes of an extensive experimental investigation, focusing on the axial behavior of protective sheathed rock bolts employed in corrosive environments, assessed through pullout tests. Three distinct testing setups were designed to evaluate comprehensively the performance of these rock bolts in various scenarios. The results indicated that the failure characteristics and axial behaviors of sheathed rock bolts differ significantly from conventional counterparts. The findings revealed two primary failure modes in sheathed rock bolts: bolt rupture and slip at the grout-sheath interface, based on the testing arrangement and encapsulation length. The lack of adhesion and interlocking at the grout-sheath interface prevents shear stress at the bolt-grout interface from reaching its maximum potential strength, resulting in grout damage manifesting as circumferential cracks. This, in turn, initiates crack formation, reducing the system’s bond strength. Additionally, it causes slip at the grout-sheath interface to occur at lower pullout loads. It can be inferred that the inner surface of the plastic sheath lacks the necessary structural integrity to withstand high loads, significantly impacting bond stress distribution and failure modes. The results demonstrate that the protective sheath remains intact up to an axial displacement of 28 mm, irrespective of the testing configuration. Additionally, it was observed that the maximum bond stress at the bolt-grout interface falls within the range of 6–8.7 MPa, which is below the shear strength of the grout. Consequently, achieving failure at the bolt-grout interface is not feasible.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106157"},"PeriodicalIF":6.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533024","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}

{"title":"Lower and upper bounds for the drained three-dimensional stability of shallow tunnels using the Extended Matsuoka-Nakai yield criterion","authors":"A.N. Antão ,&nbsp;M. Vicente da Silva","doi":"10.1016/j.tust.2024.106137","DOIUrl":"10.1016/j.tust.2024.106137","url":null,"abstract":"<div><div>The paper focuses on determining lower and upper approximations of the pressure required on the unlined part of a tunnel’s front under drained conditions. This work is carried out within the framework of classic limit analysis. In the last three decades, various approaches have been explored to enhance the understanding of the minimum pressure required for ensuring the stability of the massif during tunnel excavation under drained conditions. Methods for solving this problem are typically categorized as limit equilibrium methods, limit analysis methods, or elasto-plastic stress–strain calculations. However, the failure criterion used has almost invariably been the Mohr–Coulomb criterion. Despite its broad application, this criterion has certain limitations in evaluating the effect of the three principal stresses on the yield of earthy or rocky materials. Over time, alternative failure criteria have been proposed to address this issue, including one developed by Matsuoka and Nakai.</div><div>This work applies Limit Analysis theorems to this problem using an extended Matsuoka-Nakai criterion. Besides providing highly accurate stability factors for tunnels using this criterion, the novelty of this study also lies in the comparative analysis of numerical results with experimental data, demonstrating that the Matsuoka-Nakai criterion offers a more accurate model of the experimental data compared to the traditional Mohr–Coulomb approach.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106137"},"PeriodicalIF":6.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532992","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}

{"title":"Digital twins for urban underground space","authors":"Nandeesh Babanagar ,&nbsp;Brian Sheil ,&nbsp;Jelena Ninić ,&nbsp;Qianbing Zhang ,&nbsp;Stuart Hardy","doi":"10.1016/j.tust.2024.106140","DOIUrl":"10.1016/j.tust.2024.106140","url":null,"abstract":"<div><div>Digital twins (DTs) offer promising benefits to address several inherent problems in underground construction, yet confusion surrounds the concept due to its context-specific nature which hinders more widespread adoption. This paper seeks to clarify DT-related terminologies from a built environment perspective and define the features and maturity levels of DTs for underground spaces, considering their unique challenges. A layered architecture for constructing DTs is proposed, offering various options based on functionality, technological advancement, and expected value. Additionally, a comprehensive literature review of technologies enabling the development of digital twins for underground spaces is presented, including data-driven ground modelling, site investigation and design process integration with BIM, computational BIM, and advanced sensing and instrumentation. The paper identifies synergies between DTs and the observational method in geotechnical engineering, highlights research gaps, and proposes a transition to a prescriptive, knowledge-based DT. Furthermore, exemplar use cases of underground DTs throughout their lifecycle are explored, demonstrating their potential value.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106140"},"PeriodicalIF":6.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532995","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}