Method and model experiment of resisting dislocation of tunnel based on the brittle buffer concept
CAO Jun1,2, CUI Zhen1,2, ZHANG Xiangyu1, ZHANG Jiawei1
1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：[Objective] Tunnels are integral to transport infrastructure and often face the formidable challenge of traversing active fault zones during construction. The active fault zones indicate potential geological disturbances, leading to structural damage and posing a severe threat to tunnel safety. Therefore, this study aims to propose a method of resisting dislocation of tunnel based on the brittle buffer concept to enhance the structural integrity of tunnels when confronted with displacements induced by fault activities. The method involves strategically filling the space between the primary and secondary linings with brittle and compressible materials, which serve as buffers to absorb and mitigate localized displacements caused by fault activities, thus protecting the tunnel from substantial damage. [Methods] To rigorously study and validate the effectiveness of the proposed brittle buffer structure in resisting fault displacements, a comprehensive indoor model experiment was designed and implemented. Scaling down the size according to a 40:1 geometric similarity ratio and using similar materials for the surrounding rock, lining, and buffer structures, tunnel model was cast in the laboratory, simulating fault movements within the model box. The analysis focused on the deformations and failure characteristics of the models under different fault loads, confirming the effectiveness of the brittle buffer structure. [Results] Observations of tunnel deformation and failure modes after fault movements revealed distinct patterns. In the hanging wall of the fault, the brittle buffer structure at the arch top was crushed, accompanied by void formation at the arch bottom. Meanwhile, in the footwall of the fault, the arch top exhibited voiding, whereas the brittle buffer structure at the arch bottom was crushed. This deformation pattern effectively dispersed local shear deformations at the fault location, markedly mitigating damage to the lining. Impressively, under the protection of a 50-mm buffer structure, the lining model showed minimal damage even with a 100-mm displacement, equivalent to a substantial 4-m displacement in practical design scenarios, underscoring the robust performance of the brittle buffer structure in preserving the structural integrity of the tunnel. Furthermore, this study delved into strain monitoring data analysis and revealed a considerable shift in the peak strain of the lining away from the fault crush zone. This strategic relocation of strain concentrations to areas farther from the fault indicated a substantial reduction in strain intensity within the fault zone and confirmed the efficacy of the brittle buffer structure in dispersing and minimizing localized damage. [Conclusions] The results confirm the practical feasibility and effectiveness of incorporating a brittle buffer structure in tunnel designs for scenarios involving fault-induced displacements. This design exhibits exceptional performance in resisting fault-induced displacements, particularly suitable for tunnels crossing fault locations with significant estimated displacements. The outcomes of this study provide a crucial theoretical foundation and practical guidance for tunnel designs that cross active fault zones. This research contributes to the selection of antidisplacement solutions in tunnel engineering, paving the way for innovative approaches to address seismic challenges in tunnel construction.
曹俊, 崔臻, 张翔宇, 张佳威. 基于脆性缓冲理念的隧道抗错断方法及模型试验[J]. 清华大学学报（自然科学版）, 2024, 64(7): 1116-1125.
CAO Jun, CUI Zhen, ZHANG Xiangyu, ZHANG Jiawei. Method and model experiment of resisting dislocation of tunnel based on the brittle buffer concept. Journal of Tsinghua University(Science and Technology), 2024, 64(7): 1116-1125.
[1] 张玉芳,袁坤,周文皎,等.门源地震对跨冷龙岭断层的大梁隧道结构变形特征和地表裂缝分布规律研究[J].岩石力学与工程学报, 2023, 42(5):1055-1069. ZHANG Y F, YUAN K, ZHOU W J, et al. Study on structural deformation characteristics and surface crack distribution of girder tunnel across Lenglongling fault caused by Menyuan earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(5):1055-1069.(in Chinese) [2] 武世燕.高烈度地震区铁路隧道震害特征与整治研究[J].铁道工程学报, 2023, 40(1):76-83. WU S Y. Research on the damage characteristics and countermeasures of railway tunnel in high-intensity earthquake area[J]. Journal of Railway Engineering Society, 2023, 40(1):76-83.(in Chinese) [3] 丁秀丽,张雨霆,张传健,等.隧洞穿越活动断层应对措施及其适应性研究综述[J].隧道与地下工程灾害防治, 2019, 1(1):20-35. DING X L, ZHANG Y T, ZHANG C J, et al. Review on countermeasures and their adaptability evaluation to tunnels crossing active faults[J]. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(1):20-35.(in Chinese) [4] 汪振.跨活动断裂带岩体隧道抗错断措施及其减灾效果与机理研究[D].北京:北京工业大学, 2022. WANG Z. Disaster mitigation and damage mechanism of rock tunnels with countermeasures crossing active fault zones[D]. Beijing:Beijing University of Technology, 2022.(in Chinese) [5] 蒋树屏,李鹏,林志.穿越活动断层区隧道的抗断设计对策[J].重庆交通大学学报(自然科学版), 2008, 27(6):1034-1036, 1041. JIANG S P, LI P, LIN Z. Design strategies of breaking resistance of tunnels crossing active faults zone[J]. Journal of Chongqing Jiaotong University (Natural Sciences), 2008, 27(6):1034-1036, 1041.(in Chinese) [6] 刘学增,刘金栋,李学锋,等.逆断层铰接式隧道衬砌的抗错断效果试验研究[J].岩石力学与工程学报, 2015, 34(10):2083-2090. LIU X Z, LIU J D, LI X F, et al. Experimental research on effect of anti-dislocation of highway tunnel lining with hinge joints in thrust fault[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(10):2083-2090.(in Chinese) [7] 刘学增,林亮伦,王煦霖,等.柔性连接隧道在正断层黏滑错动下的变形特征[J].岩石力学与工程学报, 2013, 32(S2):3545-3551. LIU X Z, LIN L L, WANG X L, et al. Deformation characteristics of tunnel with flexible joints affected by normal fault stick-slip dislocation[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(S2):3545-3551.(in Chinese) [8] 刘学增,郭彪,李学锋,等.变形缝对跨断层隧道抗错断影响的模型试验研究[J].岩石力学与工程学报, 2015, 34(S2):3837-3843. LIU X Z, GUO B, LI X F, et al. Model experiment study on effect of deformation joints on road tunnel resisting destruction by thrust fault stick-slip dislocation[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(S2):3837-3843.(in Chinese) [9] 杜修力,汪振,赵密,等.穿越走滑断层的山岭隧道抗错断铰接设计试验研究[J].土木工程学报, 2022, 55(5):97-106. DU X L, WANG Z, ZHAO M, et al. Experimental study on articulated design of mountain tunnel crossing strike-slip fault zones[J]. China Civil Engineering Journal, 2022, 55(5):97-106.(in Chinese) [10] 周光新,盛谦,崔臻,等.走滑断层错动影响下跨活断层铰接隧洞破坏机制模型试验[J].岩土力学, 2022, 43(1):37-50. ZHOU G X, SHENG Q, CUI Z, et al. Model test of failure mechanism of tunnel with flexible joint crossing active fault under strike-slip fault dislocation[J]. Rock and Soil Mechanics, 2022, 43(1):37-50.(in Chinese) [11] 闫高明,申玉生,高波,等.穿越黏滑断层分段接头隧道模型试验研究[J].岩土力学, 2019, 40(11):4450-4458. YAN G M, SHEN Y S, GAO B, et al. Experimental study of stick-slip fault crossing segmental tunnels with joints[J]. Rock and Soil Mechanics, 2019, 40(11):4450-4458.(in Chinese) [12] YAN G M, SHEN Y S, GAO B, et al. Damage evolution of tunnel lining with steel reinforced rubber joints under normal faulting:An experimental and numerical investigation[J]. Tunnelling and Underground Space Technology, 2020, 97:103223. [13] ZHANG Y, ZHANG Z Q, YIN C, et al. Experimental study on forced response characteristics and anti-dislocation performance of articulated tunnel structure under dislocation action of normal fault[J]. Structures, 2023, 48:867-881. [14] WANG Q, GENG P, LI P S, et al. Failure analysis and dislocation-resistant design parameters of mining tunnel under normal faulting[J]. Engineering Failure Analysis, 2023, 143:106902. [15] 谷柏森,吴建勋,宋磊,等.链式衬砌节段长度对隧道抗错断效果的影响研究[J].筑路机械与施工机械化, 2015, 32(3):66-70. GU B S, WU J X, SONG L, et al. Research on impact of chain lining segment length on effect of tunnel dislocation-resistance[J]. Road Machinery and Construction Mechanization, 2015, 32(3):66-70.(in Chinese) [16] 赵坤,陈卫忠,赵武胜,等.逆断层错动作用下隧道衬砌铰接设计参数研究[J].岩石力学与工程学报, 2018, 37(S1):3411-3421. ZHAO K, CHEN W Z, ZHAO W S, et al. Study on parameters of articulated design of tunnel lining under reverse fault dislocation[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(S1):3411-3421.(in Chinese) [17] 周光新,盛谦,张传健,等.穿越走滑断层铰接隧洞抗错断设计参数作用机制研究[J].岩石力学与工程学报, 2022, 41(5):941-953. ZHOU G X, SHENG Q, ZHANG C J, et al. Study on action mechanism of anti-dislocation design parameters of a tunnel with flexible joint crossing strike-slip faults[J]. Chinese Journal of Rock Mechanics and Engineering, 2022, 41(5):941-953.(in Chinese) [18] 王道远,袁金秀,王记平,等.穿越断裂黏滑带隧道合理抗错断设防长度研究[J].铁道工程学报, 2019, 36(3):56-60. WANG D Y, YUAN J X, WANG J P, et al. Research on the fortification length of anti-breaking of tunnel passing through fault slip belt[J]. Journal of Railway Engineering Society, 2019, 36(3):56-60.(in Chinese) [19] SHAHIDI A R, VAFAEIAN M. Analysis of longitudinal profile of the tunnels in the active faulted zone and designing the flexible lining (for Koohrang-Ⅲ tunnel)[J]. Tunnelling and Underground Space Technology, 2005, 20(3):213-221. [20] 范雪宁,陈兴亮,刘杰,等.浅谈南水北调西线工程隧洞穿越活断层的处理对策[J].人民黄河, 2001, 23(10):41. FAN X N, CHEN X L, LIU J, et al. Discussion on treatment strategies for tunnels of the South-to-North Water Diversion West Route Project crossing active faults[J]. Yellow River, 2001, 23(10):41.(in Chinese) [21] 李守刚.减震层对跨断层隧道抗错断效果的模型试验研究[J].铁道标准设计, 2019, 63(12):106-111. LI S G. Model experimental study on anti-dislocation effect of shock absorption layer on cross-fault tunnel[J]. Railway Standard Design, 2019, 63(12):106-111.(in Chinese)
2024, Vol. 64 
