Tunnelling and Underground Space Technology最新文献

{"title":"Safety assessment of shield tunnel underpassing railway bridges considering coupled randomness of stratigraphy and tunneling parameters","authors":"Chenghua Shi ,&nbsp;Xuanyu Zhang ,&nbsp;Zixu Zhu ,&nbsp;Tao Zhu ,&nbsp;Mingfeng Lei ,&nbsp;Xiaohe Sun","doi":"10.1016/j.tust.2025.106490","DOIUrl":"10.1016/j.tust.2025.106490","url":null,"abstract":"<div><div>During shield tunneling beneath existing railway bridges, the heterogeneity of strata and the uncertainty of tunneling parameters often pose significant risks to railway operation safety. Based on statistical data from geological drilling and shield tunneling parameters in a real engineering project, this study establishes a probabilistic safety assessment framework by integrating unconditional random field theory, Co-Kriging theory, and stochastic function methods. The approach accounts for the spatial distribution constraints of geological exploration data and the statistical characteristics of tunneling parameters to simulate the coupled stochastic effects of stratigraphic physical-mechanical properties and tunneling process parameters. Numerical results reveal that simulations considering both stratigraphic information and tunneling parameter randomness exhibit significantly greater variability compared to those considering only stratigraphic or tunneling parameter randomness, underscoring the importance of their coupled stochastic effects. Furthermore, the proposed method evaluates the probability of exceeding deformation limits under various control values for railway bridges. For the case study, no speed restrictions are required during left-line tunneling. However, for right-line tunneling, a speed limit of 80 km/h is necessary when the shield head reaches beneath the railway bridge, reducing to 45 km/h as the shield moves away from the bridge. The most critical phase occurs when the shield tail exits from beneath the bridge during right-line tunneling.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106490"},"PeriodicalIF":6.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529043","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":"Seismic fragility analysis for subway station considering the soil non-linear dynamic property uncertainty","authors":"Jiawei Jiang ,&nbsp;Yazhi Zhao ,&nbsp;Di Liu ,&nbsp;Xiuli Du ,&nbsp;Guoxing Chen","doi":"10.1016/j.tust.2025.106531","DOIUrl":"10.1016/j.tust.2025.106531","url":null,"abstract":"<div><div>The dynamic characteristics of a site play a crucial role in the seismic response of underground structures. However, existing seismic vulnerability models often inadequately account for variability in soil parameters. This paper examines a frame subway station underground structure, performing both a traditional seismic vulnerability analysis considering only seismic motion record uncertainty, and a comprehensive analysis incorporating uncertainties in soil dynamic parameters. These parameters include soil shear wave velocity and three additional parameters reflecting the soil’s nonlinear dynamic behavior. The Incremental Dynamic Analysis (IDA) method was used to develop both the traditional seismic fragility curves and the curves incorporating these additional uncertainties. Differences between these two curves were quantified and compared using the Wasserstein distance. The results indicate that ignoring soil dynamic parameter uncertainty significantly impacts the assessment of post-earthquake failure probability for underground structures. This impact varies with seismic motion intensity, and the discrepancy between the two seismic fragility curves increases as the performance level of the assessed structure rises.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106531"},"PeriodicalIF":6.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529042","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":"Influence of subway train load on seismic response of twin stacked tunnels using three-directional shaking table test in sand","authors":"Yao Hu ,&nbsp;Mingming Li ,&nbsp;Huayang Lei ,&nbsp;Mingshuai Li ,&nbsp;Peng Zeng ,&nbsp;Xuejian Chen ,&nbsp;Po Cheng","doi":"10.1016/j.tust.2025.106527","DOIUrl":"10.1016/j.tust.2025.106527","url":null,"abstract":"<div><div>The seismic response of soil and tunnel can be affected by the subway train load in twin stacked tunnel case. However, the existing studies on the seismic response of stacked tunnels do not consider the influence of subway traffic load. Therefore, this study conducted a series of 3-D shaking table tests to investigate the influence of subway train load on seismic response of twin stacked tunnels in sand. The research results indicated that, for the soil-tunnel system, the subway train load reduces the values of both natural frequency and damping ratio. For the soil, the subway train load can inhibit the seismic response, which is manifested in the gradient differences of peak acceleration and peak pore pressure around the upper tunnel significantly decreased, the acceleration amplification effect weakened, and the peak surface settlement obviously reduced. For the tunnel, the subway train load can increase low-frequency amplitude at the crown position of twin tunnels, and decrease low-frequency and high-frequency amplitudes at the inverted arch position of lower tunnel. The peak earth pressure is inversely proportional to the distance from the subway train load application location. The peak strain of the upper tunnel is weakened, and this effect is most obvious at the left sidewall position. The findings in this study will provide reference for seismic design of twin stacked tunnels considering the subway train load.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106527"},"PeriodicalIF":6.7,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526566","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":"Analytical solutions for safety performance of bell-spigot jointed ductile iron pipelines under various normal fault-pipe crossing positions","authors":"Qingshu Chen ,&nbsp;Xiaogang Qin ,&nbsp;Pengpeng Ni ,&nbsp;Mingge Ye ,&nbsp;Jianfeng Li","doi":"10.1016/j.tust.2025.106507","DOIUrl":"10.1016/j.tust.2025.106507","url":null,"abstract":"<div><div>Safety assessment of ductile iron (DI) pipelines under fault rupture is a crucial aspect for underground pipeline design. Previous studies delved into the response of DI pipelines to strike-slip faults, but all existing theoretical methods for DI pipelines under strike-slip faults are not suitable for normal fault conditions due to the difference in soil resistance distribution. In this study, analytical solutions considering asymmetric soil resistance and pipe deflection are developed to analyze the behavior of DI pipelines under normal faulting. Results indicate that DI pipelines with a longer segment length are more vulnerable to pipe bending damage, while exhibiting a lower sensitivity to joint rotation failure. For the conditions of pipe segment length <em>L</em> = 1.5 m at all burial depths and <em>L</em> = 3 m at a shallow burial depth, when the fault-pipe crossing position shifts from a joint to a quarter of the segment length (<em>rp</em> = 0 ∼ 0.25), DI pipelines are more prone to joint rotation failure. However, in the cases of <em>L</em> = 3 m at a moderate to deep burial depth and <em>L</em> = 6 m at all burial depths, the most unfavorable position is <em>rp</em> = 0.75, dominated by the mode of pipe bending failure.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106507"},"PeriodicalIF":6.7,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526567","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":"Study on rockburst control of deep-buried tunnel by combining advanced stress release borehole and hydraulic fracturing","authors":"Jiaming Li ,&nbsp;Shibin Tang ,&nbsp;Tianjiao Li ,&nbsp;Shuguang Zhang ,&nbsp;Liexian Tang ,&nbsp;Kang Sun","doi":"10.1016/j.tust.2025.106517","DOIUrl":"10.1016/j.tust.2025.106517","url":null,"abstract":"<div><div>Rockbursts are a common geological hazard during the construction of deep-buried tunnels and seriously threaten the safety of workers. To control rockbursts, first, during the construction of the Hanjiang-to-Weihe River Diversion Project, advance stress release borehole (ASRB) tests were conducted in each of the three different depth tunnel sections where rockbursts occur frequently. Then, microseismic (MS) monitoring technology was used to monitor the microfracture information inside the surrounding rock in real- time during the excavation process. The effectiveness of ASRBs for rockburst control was evaluated by comparing the counts, MS energies and rockburst levels in the drilled and adjacent undrilled sections. The results showed that the ASRBs did not provide the expected pressure relief effect in every tunnel section. In rock masses with higher in- situ stress, the ASRBs did not form a pressure relief zone and instead led to local stress concentration and increased the risk of rockbursts. Finally, this study proposed rockburst control technology for deep-buried tunnels using a combination of ASRBs and hydraulic fracturing (HF) and verified the feasibility of the technology using numerical simulation methods. In addition, the effects of parameters such as the diameter, number and location of ASRBs on the effectiveness of HF in controlling rockbursts are discussed in this study. The rockburst control measures proposed in this study have significance for the construction of deep-buried tunnels.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106517"},"PeriodicalIF":6.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526565","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":"Experimental analysis of the failure modes and precursors of surrounding rocks in 3D-printed tunnels with rough fractures: Insights into the influence of excavation shapes","authors":"Boran Huang ,&nbsp;Peitao Wang ,&nbsp;Yijun Gao ,&nbsp;Qingru Liu ,&nbsp;Wei Yuan","doi":"10.1016/j.tust.2025.106510","DOIUrl":"10.1016/j.tust.2025.106510","url":null,"abstract":"<div><div>The rock surrounding tunnels typically exhibits rough structural surfaces with complex morphologies, making it difficult to understand their failure mechanisms and mechanical characteristics. In this study, 3D printing was used to create fractured rock specimens with different geometric excavation shapes. Compression tests and digital image correlation (DIC) analyses were conducted to investigate the mechanical properties, fracture patterns, and failure precursors during the loading process. The results indicate that the 3D-printed rock specimens can efficiently represent the failure behaviour of the surrounding rocks. Jointed rock masses with horseshoe-shaped roadways exhibited higher mechanical resistance. The identified fracture patterns showed monoclinic shear damage with a combination of compression and shear, suggesting ductile deformation. A notable, abrupt change in the shear-strain and strain-rate indices during loading corresponds to crack formation, and serves as a precursor to rock fracture. The study revealed that the changes in the shear-strain field aligned with the evolution of rock fractures. Among them, jointed rock masses featuring a horseshoe-shaped roadway exhibited the most prominent correlation, followed by those featuring elliptical and circular roadways. These findings demonstrate the potential of 3D printing and DIC analysis for rock mechanical testing, failure precursors, and forecasting. This highlights the utility of shear-strain indicators for identifying fracture precursors on rough structural surfaces of rocks surrounding roadways.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106510"},"PeriodicalIF":6.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519499","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":"Study on different influence factors of in-situ stress unloading by dynamic excavation in circular tunnel","authors":"Jun Zhou ,&nbsp;Jinshan Sun ,&nbsp;Guangming Zhao ,&nbsp;Chunliang Dong ,&nbsp;Xiangrui Meng","doi":"10.1016/j.tust.2025.106518","DOIUrl":"10.1016/j.tust.2025.106518","url":null,"abstract":"<div><div>With the depth of underground mining increase, the in-situ stress is more and more high, which may causes strong disturbance to surrounding rock. To study in-situ stress unloading in blasting excavation of roadway. The unloading influence factors with wave velocity, excavation radius and unloading time are discussed by defining unloading rate. The in-situ stress unloading experiments are performed by impacting different material models. And consider the unloading influence factors with axial stress, excavation radius and lithology in experiment. The results show that unloading stress is fluctuate during in-situ stress unloading, unloading stress decrease first, then increase, and tend to be stable finally. During in-situ stress unloading process, the unloading rate increases with the increase of rock wave velocity, and the more disturb severely of different rock velocity with the unloading rate increases. The unloading rate increases with the increase of rock excavation radius, and the larger scale disturb of different excavation radius with the unloading rate increases. The unloading rate increases with the decrease of unloading time, and the more dynamic disturb intensely of different unloading time with the unloading rate increases. The experiments show that radial cracks are generated by impact stress wave and circular cracks are generated by unloading stress wave. Comparing unloading result, hard rock material generate more damage area than soft rock material, unloading damage of soft rock material focus near excavation face and generate more cracks. Smaller excavation radius are not generate circular crack, it also shows that rock storage energy release completely need enough unloading space.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"160 ","pages":"Article 106518"},"PeriodicalIF":6.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519501","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":"Experimental research on the rotary rock-breaking effect of tunnel boring machine cutters assisted by microwave irradiation","authors":"Gaoming Lu ,&nbsp;Zhiyong Lu ,&nbsp;Yongsheng Liu ,&nbsp;Yangkai Zhang ,&nbsp;Wenchao Fan","doi":"10.1016/j.tust.2025.106512","DOIUrl":"10.1016/j.tust.2025.106512","url":null,"abstract":"<div><div>To deeply analyze the rock-breaking effect of tunnel boring machine (TBM) cutters assisted by microwave irradiation, rock-breaking experiments were conducted on microwave-irradiated rocks using reduced-scale TBM cutters. Influences of parameters including the microwave exposure time, microwave power, cutter spacing, same rolling distance (different rock-breaking depths), and penetration rate on rock-breaking marks, rock removal, wear loss of cutters, average cutter thrust, average cutterhead torque, and rock-breaking specific energy were explored. Research results show that under the same rotation diameter, increasing the microwave exposure time and microwave power decreases the wear loss of cutters, average cutter thrust, average cutterhead torque, and rock-breaking specific energy while increases the rock removal. If the cutter spacing is too large, the rock between adjacent cutting marks cannot be effectively exfoliated, the average cutter thrust and cutterhead torque enlarge, and the rock-breaking efficiency reduces. The wear loss of cutters is directly proportional to the rock-breaking depth. Under the current experimental conditions, using a large rock-breaking depth can exfoliate rock debris and improve the rock-breaking efficiency. A high penetration rate reduces the rotation number of the cutterhead, promotes the generation of rock debris, enlarges the rock removal, and improves the rock-breaking efficiency.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106512"},"PeriodicalIF":6.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510203","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":"Three-dimensional numerical investigation of ground settlement caused by side-by-side twin tunnels","authors":"Md Shariful Islam ,&nbsp;Magued Iskander","doi":"10.1016/j.tust.2025.106509","DOIUrl":"10.1016/j.tust.2025.106509","url":null,"abstract":"<div><div>A parametric study using 3D finite element analyses was conducted to investigate settlement behavior and interactions between side-by-side twin tunnels during excavation. The study considered six cover-to-diameter (C/D) ratios, ten pillar-to-diameter (P/D) ratios, and two construction sequences. The total settlement of the excavated twin tunnels and the settlement induced solely by the new second tunnel were analyzed. Validation was performed by comparing results with published case studies, showing trends consistent with existing literature. Key findings include: (1) greater cover depth produces a wider settlement trough and reduces second tunnel-induced settlement, though total settlement slightly increases; (2) cover depth significantly affects second tunnel-induced settlement, while pillar width impacts total settlement; (3) concurrent excavation causes slightly higher settlement and a deeper, wider trough compared to staggered excavation; (4) lower cover depths result in higher settlement increase rates. Finally, two design charts are proposed to estimate settlement from the second tunnel and the eccentricity of the maximum total settlement relative to the center of the new tunnel.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106509"},"PeriodicalIF":6.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512152","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":"Analysis on time-frequency characteristics and construction response of microseismic events on high and steep rock slopes: A case study of Dongzhuang Water Conservancy Project","authors":"Ke Ma ,&nbsp;Haiyang Liu ,&nbsp;Kaikai Wang ,&nbsp;Di Wu","doi":"10.1016/j.tust.2025.106499","DOIUrl":"10.1016/j.tust.2025.106499","url":null,"abstract":"<div><div>The right bank slope of the Dongzhuang Water Conservancy Project is steep and high, with numerous dissolution cavities and mud-filled cracks forming reasonably well in the solid limestone, complicating the geological conditions and emphasizing the slope stability issue. To clarify the activation characteristics of various weak structural planes in the rock mass of the right bank slope under the influence of geological defect treatment and high-pressure grouting disturbance and to evaluate the overall stability of the slope, a real-time monitoring system for micro-seismic activity in both the deep and shallow parts of the slope rock mass was used, combining core drilling and colored borehole television technology. A generalized β wavelet high-resolution time-frequency transformation algorithm was used to analyze the dynamic micro-seismic response and damage characteristics of the slope rock mass under different engineering disturbances. The results reveal that: (1) The rock mass on the right bank slope deteriorates as a result of limestone breakdown and local mineral infill, while its plastic properties improve. Microseismic events have an amplitude of 0.06 mV and low energy, and their frequency is primarily focused between 100 and 300 Hz, with low-frequency vibrations dominating. (2) During drilling disruption, the micro-fractures on both sides and the deeper areas of the Rnj3 dissolution-mud-filled fracture become much stronger than before drilling. The lateral fracture surface of the Rnj3 dissolution-mud-filled fracture and the bottom slip surface of the L61 fracture have a weak temporal and spatial link during micro-crack development, and the energy release level is low. As the microseismic activity of the downstream L61 fracture reduces, the prospective sliding body’s slip risk is reduced. (3) During the early grouting stage, the high-pressure slurry washed out the muck from the mud-filled fracture. This caused localized dislocation instability of the neighboring rock mass, resulting in micro-seismic event clusters scattered along the fracture zone. After grouting, there were fewer micro-seismic events at an elevation at a height at the Rnj3 mud-filled crack, indicating low rock mass activity. By the middle of grouting, the formation of microseismic events has stopped, and the surrounding rock was stable under the consolidating impact of the grout. The findings serve as a key guide for curtain grouting reinforcement of steep slopes and other comparable projects.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106499"},"PeriodicalIF":6.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510745","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}