蠕滑-地震动联合作用下跨断层输水隧洞衬砌结构损伤分析  

Damage analysis of lining structure of cross⁃fault water conveyance tunnel under the combined action of creep and ground motion

作　　者：张中昊 李赛 汪可欣 ZHANG Zhonghao;LI Sai;WANG Kexin(School of water conservancy and civil engineering,Northeast Agricultural University,Harbin 150030,China;School of civil engineering,Harbin Institute of Technology,Harbin 150000,China)

机构地区：[1]东北农业大学水利与土木工程学院,哈尔滨150030 [2]哈尔滨工业大学土木工程学院,哈尔滨150000

出　　处：《振动与冲击》2025年第4期275-285,共11页Journal of Vibration and Shock

基　　金：黑龙江省省属本科高校“优秀青年教师基础研究支持计划”重点项目(59200110)。

摘　　要：为了探究断层蠕滑错动和地震动顺序作用下流固耦合作用对于衬砌结构稳定性和损伤的影响,建立隧洞-围岩-水联合作用的有限元模型,进行输水隧洞结构动力响应分析。结果表明:在地震动作用下,无水和满水工况下衬砌监测点位移响应的变化趋势趋于一致,满水工况下的竖直方向位移响应发生较大波动,但隧洞内的动水作用抑制了横向位移响应;衬砌塑性应变的最大值均出现在断层错动面,满水工况下衬砌表现为更危险的塑性状态;满水工况下衬砌单元的损伤状态更为严重,且损伤集中于断层处的衬砌部位,第4级衬砌单元损伤中,压缩损伤单元总体积为79.02 m^(3),拉伸损伤单元总体积为349.78 m^(3)。同无水工况下的衬砌单元4级损伤状态相比,当隧洞满水时,压、拉损伤单元体积分别存在了6%和7%的增长幅度,说明流固耦合作用导致断层处衬砌损伤加剧。研究成果可为输水隧洞结构抗震设计提供参考。In order to investigate the effects of the coupling of fluid and solid under the sequence of fault creep⁃slip misalignment and ground vibration on the stability and damage of the lining structure,a finite element model of the joint action of tunnel⁃rock⁃water was established,and the structural dynamic response analysis of the water⁃conveyance tunnel was carried out.The results show that:under the action of ground vibration,the trend of displacement response of lining monitoring points tends to be the same under both no⁃water and full⁃water conditions,and the vertical displacement response under the full⁃water condition fluctuates greatly,but the lateral displacement response is suppressed by the action of moving water in the tunnel;The maximum plastic strain of the lining appears on the fault dislocation surface,and the lining is in a more dangerous plastic state under full⁃water conditions;the damage state of the lining unit is more serious under full⁃water conditions,and the damage is concentrated on the lining at the fault.In the level 4 lining unit damage,the total volume of the compression damage unit is 79.02 m^(3),and the total volume of the tensile damage unit is 349.78 m^(3).Compared with the level 4 damage state of lining units under no⁃water conditions,when the tunnel is full of water,the volume of pressure and tension damage units increases by 6%and 7%respectively,indicating that fluid⁃solid coupling causes increased lining damage at the fault.The research results can provide reference for the seismic design of water conveyance tunnel structures.

关 键 词：输水隧洞 蠕滑错动 流固耦合 结构稳定性 损伤 地震动作用 

分 类 号：TV672[水利工程—水利水电工程]