基于数值模拟对深埋引水隧洞地震响应研究

Study on Seismic Response of Deeply Buried Water Diversion Tunnel Based on Numerical Simulation

以某城市某项目引水隧洞为研究对象,以构建的深埋引水隧洞的地震响应进行数值模拟研究为基础,通过控制变量,分析不同条件下岩体的力学特性,建立其本构关系模型。同时,分析模型情况,并在动静荷载作用下研究其岩体的具体破坏情况。结果表明,通过建立数值模拟本构关系模型,其本构关系曲线主要为直线弹性-脆性下降-理想状态3个阶段,同时考虑以应变、围压以及破坏效应为主要基础。引水隧洞经受地震条件作用时,响应过程与深埋应力结构具有差异。通过分析静动条件下引水隧洞地震响应情况,从不同轴压、围压条件以及峰值、荷载作用时间4个变量对引水隧洞的地震响应情况进行探讨。应力状况会随着轴压变大而变大,随着围压变大而变小。并且当荷载作用时间不变时,峰值荷载越小,其应力越小;当地震峰值荷载不变时,荷载作用时间越长,其应力越大。

Based on a numerical simulation study of the seismic response of a deep buried water diversion tunnel constructed for a project in a city, the mechanical properties of the rock mass under different conditions are analyzed by controlling the variables, and the intrinsic structure relationship model is thus established. The model is then analyzed and the specific damage of the rock mass is studied under dynamic and static loads. The results show that by establishing a numerical simulation of the intrinsic structure relationship model. The intrinsic constitutive relationship curves can be mainly based on the three stages of linear elasticity-brittle decline-ideal state, taking into account the strain, surrounding pressure and damage effects. The response process of the diversion tunnel under seismic conditions is different from that of the deeply buried stress structure. The seismic response of the diversion tunnel under static and dynamic conditions is explored. The seismic response of the diversion tunnel is explored in terms of four variables: different axial pressures, enclosing pressure conditions, peak load and action time. The stress condition becomes larger with larger axial pressure;smaller with larger surrounding pressure, and the smaller the peak load, the smaller the stress when the load action time is constant;and the longer the load action time, the larger the stress when the peak seismic load is constant.