逆断层黏滑作用下隧道力学行为研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (17) : 249-258.

论文

逆断层黏滑作用下隧道力学行为研究

郭翔宇1,2，耿萍1,2，丁梯3，王琦1,2，杨琪1,2，何悦1,2

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Mechanical behavior of tunnel under stick-slip action of reverse fault

GUO Xiangyu1,2, GENG Ping1,2, DING Ti3, WANG Qi1,2, YANG Qi1,2, HE Yue1,2

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摘要

西南地区板块运动活跃，隧道不可避免的会穿越活动断裂带，活动断裂带的黏滑作用将对隧道结构的安全和稳定性构成巨大威胁。首先建立300 km×100 km的空间大尺度板块挤压模型，通过对板块施加挤压速率，计算板块运动20万年期间逆断层黏滑作用的产生及变形特点，然后将断层黏滑时刻位移施加到精细有限元模型上，分析隧道结构在逆断层黏滑作用下的力学与损伤行为。结果显示黏滑时刻断层面处剪切应力呈现“骤降-再回升”状态，同时断层上盘产生脉冲型速度时程；断层顶面位移特征曲线可分为单峰值曲线和双峰值曲线，最终均保持永久位移；地层刚度越大，隧道衬砌在黏滑作用下产生的裂缝宽度越大，裂缝拓展范围则越小。所研究工况下，不同地质条件时，衬砌最大裂缝宽度为198 cm，最大扩展长度为554 m。该研究成果可为隧道在逆断层黏滑作用下的结构破坏特点提供参考。

Abstract

Plate movement is active in southwest China.Tunnels will inevitably cross active fault zones.The stick-slip effect of active fault zones will pose a great threat to safety and stability of tunnel structures.Here, firstly, a spatial large-scale plate extrusion model of 300 km ×100 km was established.Through applying the extrusion rate to the plate, generation and deformation characteristics of reverse fault stick-slip action during 200 000 years of plate movement were calculated, and then displacement at time of fault stick-slip was applied to the fine finite element model to analyze mechanical and damage behavior of tunnel structure under the action of reverse fault stick-slip.The results showed that shear stress at fault presents a state of “sudden drop and then rise” at time of stick-slip, and a pulse velocity time history is generated on hanging wall of fault; displacement characteristic curve on fault top surface can be divided into single-peak curve and double-peak curve, finally both of them maintain permanent displacement; the larger the stratum stiffness, the wider the crack width generated by tunnel lining under stick-slip and the smaller the crack expansion range; under working conditions studied and different geological conditions, the maximum crack width of tunnel lining is 19.8 cm, and the maximum crack expansion length is 55.4 m; the study results can provide a reference for studying structural failure characteristics of tunnel under action of reverse fault stick-slip.

导出引用

郭翔宇，耿萍，丁梯，王琦，杨琪，何悦. 逆断层黏滑作用下隧道力学行为研究[J]. 振动与冲击, 2021, 40(17): 249-258

GUO Xiangyu, GENG Ping, DING Ti, WANG Qi, YANG Qi, HE Yue. Mechanical behavior of tunnel under stick-slip action of reverse fault[J]. Journal of Vibration and Shock, 2021, 40(17): 249-258

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