穿越走滑断层铰接隧洞抗错断设计参数作用机制研究

doi:10.13722/j.cnki.jrme.2021.0916

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摘要为了研究铰接隧洞抗错断设计参数作用机制，通过开展小尺度物理模型试验，系统、深入地研究衬砌厚度、衬砌节段长度、隧洞直径、隧洞与断层带交角和隧洞断面型式等铰接设计参数对跨断层铰接隧洞结构变形破坏机制的影响。为了保证数值模型能够揭示合理的预测结果，将物理模型试验结果与数值分析结果进行比较，验证数值模拟的正确性。通过数值模拟研究断层带宽度、变形缝宽度、柔性连接材料刚度等铰接设计参数对铰接隧洞衬砌内力响应的影响。研究结果如下：(1) 断层作用下的铰接隧洞呈现“S”形，隧洞破坏多表现为衬砌节段间铰接结构破坏，节段间发生大角度转动和错台，少数情况下衬砌节段发生压剪破坏。(2) 铰接隧洞衬砌变形主要集中在断层带内。在两盘与断层带交界处，活动盘范围衬砌左边墙处于受拉状态，右边墙呈现受压趋势；固定盘范围衬砌左边墙处于受压状态，右边墙处于受拉状态。(3) 断层带范围的衬砌内力呈现锯齿状变化，衬砌内力在变形缝处有明显的跌落。衬砌处于反向对称受弯的状态，最大弯矩出现在两盘与断层带交界部位；最大剪力出现在断层带中央部位。(4) 在铰接隧洞抗错断设计参数作用机制方面，增加衬砌厚度、减小衬砌节段长度、减小隧洞直径，可以有效提高铰接隧洞的抗错断性能。圆形断面相较于马蹄形断面可提升铰接隧洞的抗断能力，隧洞穿越断层带的最佳夹角为90°。较宽的断层破碎带和在合理范围内采用宽度较小的变形缝和刚度较小的柔性连接材料，使得穿越走滑断层铰接隧洞更加安全。

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	周光新1
	2
	盛谦1
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	张传健3
	颜天佑3
	崔臻1
	2
	李建贺3
	王天强4

关键词 ：隧道工程, 铰接隧洞, 走滑断层, 模型试验, 数值模拟, 抗错断措施

Abstract：To investigate the action mechanism of anti-dislocation design parameters of a tunnel with flexible joint，the effects of the parameters of ‘articulated design’ on the damage pattern and anti-faulting mechanism of a tunnel are investigated by small-scale physical model tests，such as the lining segment length，the lining thickness，the tunnel diameter，the angle between the tunnel and the fault zone，and the lining cross-section type. The model test results are compared with the small-scale numerical analysis results to verify the correctness of the numerical simulations. The full-scale numerical model is applied to analyze the effects of the ‘articulated design’ parameters on the internal force response of a tunnel，such as the fault width，the flexible joint width and the stiffness of the flexible joint material. The results of the study show：(1) The damage characteristics of a tunnel with flexible joint are mainly exhibited with the failure of the flexible joints in the fault zone，the rotation between the lining segments under the dislocation of the strike-slip fault zone and S-shaped deformation of the tunnel in the longitudinal direction. In a few cases，the tunnel presents compression-shear damage of the lining segments. (2) The deformation of a tunnel with flexible joint is mainly concentrated in the fault zone. At the junction of the two walls and the fault zone，the left wall of the active plate is in tension and the right wall of the active plate is in compression；The left wall of the fixed plate is in compression and the right wall of the fixed is in tension. (3) The lining internal force in the fault zone appears sawtooth variation，while there is an obvious drop at the flexible joints. It can be concluded that the lining is in center-symmetric bending state，and that the position of the maximum moment is found at the boundary of the rock mass and the fault zone. while the maximum shear force occurs in the central of the fault zone. (4) In the aspect of the action mechanism of the design parameters of the tunnel with flexible joint，this paper concludes that increasing the tunnel thickness，decreasing the lining segment length or reducing the diameter of the tunnel can improve anti-faulting performance of a tunnel. The circular lining cross-section can improve the anti-faulting ability of a tunnel with flexible joint compared with the horseshoe lining cross-section，and the best angle of the tunnel through the fault zone is 90º. The wider fault zone，smaller deformation joint width，and less stiffness of flexible joint materials within a reasonable range make a tunnel with flexible joint safer under strike-slip fault dislocation.

Key words： tunnelling engineering tunnel with flexible joint strike-slip fault model test numerical analysis anti-faulting measure

引用本文:

周光新1，2，盛谦1，2，张传健3，颜天佑3，崔臻1，2，李建贺3，王天强4. 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 Guangxin1，2，SHENG Qian1，2，ZHANG Chuanjian3，YAN Tianyou3，CUI Zhen1，2，LI Jianhe3，WANG Tianqiang4. Study on action mechanism of anti-dislocation design parameters of a tunnel with flexible joint crossing strike-slip faults. , 2022, 41(5): 941-953.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0916 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I5/941

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