Static and dynamic characteristic analysis of segment joints based on three-dimensional discontinuous contact model
AI Hui-jun1, PENG Li-min1, 2, SHI Cheng-hua1, 2
1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. National Engineering Laboratory of High Speed Railway Construction, Changsha 410075, China
Abstract：Based on the nonlinear contact theory and considering the discontinuity of shield tunnel structure, a three- dimensional discontinuous contact model for track bed-segment-surrounding rocks is established by simulating the segment joints and the interaction between the segment and the surrounding rocks as well as the track bed. The mechanical and deformation properties of the segment joints under the pressure of the surrounding rocks and the action of the subway train dynamic load are analyzed in depth based on this model. The results of numerical simulations show that under the pressure of the surrounding rocks, some longitudinal joints in arch crown area and arch bottom open inwards; some joints in haunch of shield tunnel open outwards; and the dislocations between the completed blocks and the adjacent blocks in arch crown area are comparatively large. The joints in haunch are compressed obviously and those in arch crown have the minimum pressure under the pressure of the surrounding rocks. The axial forces of joint bolts in vault area are relatively the greatest, those in arch bottom come second, and those in haunch are the smallest. The shearing forces of joint bolts in the top of arch foots are also the greatest when segment ring rotates to an angle so as to complete assembly. The opens and dislocations of the segment joints, concrete stress and internal forces of joint bolts all increase rapidly at the beginning of the dynamic load, then significantly decrease, and finally are fluctuant under the action of dynamic load of subway trains. The dynamic response of joints in arch crown is more obvious than that in arch bottom for shallow buried metro tunnels. The shearing forces of joint bolts increase more than the axial forces under the action of dynamic load of subway trains.
艾辉军, 彭立敏, 施成华. 基于三维非连续接触模型的管片接头静动力特性分析[J]. 岩土工程学报, 2013, 35(11): 2023-2029.
AI Hui-jun, PENG Li-min, SHI Cheng-hua. Static and dynamic characteristic analysis of segment joints based on three-dimensional discontinuous contact model. Chinese J. Geot. Eng., 2013, 35(11): 2023-2029.
[1] 莫海鸿, 邓飞皇, 王军辉. 运营期地铁盾构隧道动力响应分析[J]. 岩石力学与工程学报, 2006, 25(增刊2): 2507-3512. (MO Hai-hong, DENG Fei-huang, WANG Jun-hui. Analysis of dynamic responses of shield tunnel during metro operation[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S2): 2507-3512. (in Chinese)) [2] 刘建航, 侯学渊. 盾构法隧道[M]. 北京: 中国铁道出版社, 1991. (LIU Jian-hang, HOU Xue-yuan. Shield tunnel[M]. Beijing: China Railway Publishing House, 1991. (in Chinese)) [3] 朱合华, 陶履彬. 盾构隧道衬砌结构受力分析的梁-弹簧系统模型[J]. 岩土力学, 1998, 19(2): 26-32. (ZHU He-hua, TAO Lü-bin. Study on two beam-spring models for the numerical analysis of segments in shield tunnel[J]. Rock and Soil Mechanics, 1998, 19(2): 26-32. (in Chinese)) [4] 董新平. 极限荷载条件下盾构管片接头模型比较研究[J]. 岩土工程学报, 2013, 35(6): 1178-1182. (DONG Xin-ping. A benchmark analysis of the segment joint model for segmented tunnel lining in the ultimate limit state[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(6): 1178-1182. (in Chinese)) [5] 张冬梅, 樊振宇, 黄宏伟. 考虑接头力学特性的盾构隧道衬砌结构计算方法研究[J]. 岩土力学, 2010, 31(8): 2546-2552. (ZHANG Dong-mei, FAN Zhen-yu, HUANG Hong-wei. Calculation method of shield tunnel lining considering mechanical characteristics of joints[J]. Rock and Soil Mechanics, 2010, 31(8): 2546-2552. (in Chinese)) [6] 闫治国, 彭益成, 丁文其, 等. 青草沙水源地原水工程输水隧道单层衬砌管片接头荷载试验研究[J]. 岩土工程学报, 2011, 33(9): 1385-1390. (YAN Zhi-guo, PENG Yi-cheng, DING Wen-qi, et al. Load tests on segment joints of single lining structure of shield tunnel in Qingcaosha Water Conveyance Project[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(9): 1385-1390. (in Chinese)) [7] 闫治国, 丁文其, 沈碧伟, 等. 输水盾构隧道管片接头力学与变形模型研究[J]. 岩土工程学报, 2011, 33(8): 1185-1191. (YAN Zhi-guo, DING Wen-qi, SHEN Bi-wei, et al. Structural model for radial joints of water-conveyance shield tunnels[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1185-1191. (in Chinese)) [8] 陈俊生, 莫海鸿. 盾构隧道管片接头抗弯刚度的三维数值计算[J]. 铁道学报, 2009(4): 87-91. (CHEN Jun-sheng, MO Hai-hong. Three-dimensional FEM analysis on flexural rigidity of segment joints in shield tunnel[J]. Journal of the China Railway Society, 2009(4): 87-91. (in Chinese)) [9] 郭毅之, 金先龙, 丁俊宏, 等. 沉管隧道地震响应分析中的三维接触模型与算法研究[J]. 应用力学学报, 2006, 20(1): 48-52. (GUO Yi-zhi, JIN Xian-long, Ding Jun-hong, et al. Three-dimensional contact model and algorithm for earthquake response of immersed tunnel[J]. Chinese Journal of Applied Mechanics, 2006, 20(1): 48-52. ( in Chinese)) [10] 杨阜东. 高水压越江盾构隧道管片结构稳定性分析[D]. 济南: 山东大学, 2011. (YANG Fu-dong. Structural stability study for underwater shield-driven tunnel lining under high hydraulic pressure[D]. Ji'nan: Shandong University, 2011. (in Chinese)) [11] 赵武胜, 何先志, 陈卫忠, 等. 盾构隧道地震响应分析方法及工程应用[J]. 岩土力学, 2012, 33(8): 2415-2421. (ZHAO Wu-sheng, HE Xian-zhi, CHEN Wei-zhong, et al. Method for analyzing seismic response of shield tunnel and its application[J]. Rock and Soil Mechanics, 2012, 33(8): 2415-2421. (in Chinese)) [12] 梁 波, 蔡 英. 不平顺条件下高速铁路路基的动力分析[J]. 铁道学报, 1999, 21(2): 84-88. (LIANG Bo, CAI Ying. Dynamic analysis of subgrade of high speed railways in geometric irregular condition[J]. Journal of the China Railway Society, 1999, 21(2): 84-88. (in Chinese))
