Simulation method for gas tightness of segment joints of shield tunnels and analysis of influencing factors
SUN Xin1, WU Wei2,3, JIAO Ya-ji2, JIN Rui2, MENG Xiang-rui2, ZHU He-hua2,3, HE Jie2, TU Xin-bin1, HUANG Chang-yuan1
1. State Grid Corporation of China, Beijing 100031, China;
2. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China;
3. State Key Laboratory for Disaster Reduction in Civil Engineering, Shanghai 200092, China
When a shield tunnel passes through a gas-bearing stratum, the disturbance of construction to the stratum is easy to cause gas leakage, and gas tends to enter the tunnel through the joint of shield tube, which is easy to cause explosion and other disasters. Based on the Sutong GIL integrated pipe gallery project which crosses the high-pressure gas-bearing strata in the Yangtze River, the main factors affecting gas leakage on the joint surface of shield tunneling tube are studied, and the corresponding improvement measures are proposed. The whole process of the gas leakage in the joint surface under pressure loading is analyzed through the joint model tests, and the main factors affecting the gas tightness of the joint surface at different stages of gas leakage are revealed. A numerical simulation model for joints is established to study the effects of the opening of the joint surface and the roughness of the pipe surface on the gas tightness performance of joints under pressure loading. Based on the PC model for gas flow in seal gap of rough surface, the theoretical method for gas leakage rate at the joint of shield tube is established, and the results are compared with those of model tests, which proves the feasibility and applicability of the theoretical method. Finally, by combining the model tests and the theoretical method, the measures to reduce the gas leakage rate of joints are put forward.
孙昕, 武威, 焦亚基, 金瑞, 孟祥瑞, 朱合华, 贺洁, 涂新斌, 黄常元. 盾构隧道管片接缝气密性模拟方法与影响因素分析[J]. 岩土工程学报, 2021, 43(2): 375-382.
SUN Xin, WU Wei, JIAO Ya-ji, JIN Rui, MENG Xiang-rui, ZHU He-hua, HE Jie, TU Xin-bin, HUANG Chang-yuan. Simulation method for gas tightness of segment joints of shield tunnels and analysis of influencing factors. Chinese J. Geot. Eng., 2021, 43(2): 375-382.
[1] 卢浩, 王明洋, 戎晓力, 等. 含气地层中气体释放对盾构隧道稳定性影响研究[J]. 岩土力学, 2013, 34(增刊1): 301-306.
(LU Hao, WANG Ming-yang, RONG Xiao-li, et al.Study of influence of gas entering tunnel on stability of shield tunnel in gassy soil layer[J]. Rock and Soil Mechanics, 2013, 34(S1): 301-306. (in Chinese))
[2] 唐益群, 叶为民, 张庆贺. 长江口软土层中沼气与隧道安全施工技术研究[J]. 同济大学学报(自然科学版), 1996(4): 465-470.
(TANG Yi-qun, YE Wei-min, ZHANG Qing-he.Marsh gas in soft stratum at the estuary of the Yangtse River and safety measures of construction of the tunnel[J]. Journal of Tongji University (Natural Science), 1996(4): 465-470. (in Chinese))
[3] CHAPMAN S, COWLING T G.The Mathematical Theory of Non-Uniform Gases: An Account of the Kinetic Theory of Viscosity, Thermal Conduction and Diffusion in Gases[M]. Cambridge: Cambridge University Press, 1970.
[4] WOODS L C.An Introduction to the Kinetic Theory of Gases and Magnetoplasmas[M]. Oxford: Oxford University Press, 1993.
[5] RIVLIN R S.Large elastic deformations of isotropic materials IV: further developments of the general theory[J]. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1948, 241: 379-397.
[6] GENT A N, CAMPION R P.Engineering with Rubber: How to Design Rubber Components[M]. New York: Hanser Gardner Publications, 2001.
[7] 丁文其, 赵伟, 彭益成, 等. 盾构隧道防水密封垫长期防水性能预测方法研究[C]// 水下隧道建设与管理技术论文集, 2013, 北京: 28-33.
(DING Wen-qi, ZHAO Wei, PENG Cheng-yi, GUO Xiao-hong, YANG Lin-song, TUO Yong-fei. Research on the method of predicting the long-term waterproof performance of shield tunnel waterproof gasket[C]// Technical Papers on Underwater Tunnel Construction and Management, 2013, Beijing: 28-33. (in Chinese))
[8] PATIR N, CHENG H S.Average flow model for determining effects of three-dimensional roughness on partial hydrodynamic lubrication[J]. Journal of Tribology, 1978, 100(1): 12-17.
[9] 任晓. 三维粗糙表面的表征及其气体密封性能研究[D]. 大连: 大连理工大学, 2009.
(REN Xiao.Characterization and Gas Sealing Performance Analysis of Three-Dimensional Rough Surfaces[D]. Dalian: Dalian University of Technology, 2009. (in Chinese))
