富水隧道衬砌水压力数值仿真与应用

Numerical Simulation and Application of Lining Water Pressure of Water Rich Tunnel

基于流固耦合理论,建立富水隧道衬砌水压力数值仿真模型,流体模型采用各向同性渗流模型,隧道衬砌排水孔采用实体单元模拟,排水孔设定较大的渗透系数。数值仿真结果表明,排水减小了衬砌水压力,距离排水孔越近,衬砌水压力越小;反之,衬砌水压力越大。现场测试结果与数值仿真结果比较吻合,验证了该数值仿真模型的正确性。将该仿真模型应用在注浆设计中,增大注浆圈厚度,减小注浆圈渗透系数,衬砌水压力随之减小。

Based on the fluid solid coupling theory,the numerical simulation model of water pressure load on lining of water rich tunnel is established.The fluid model adopts the isotropic seepage model,the tunnel lining drainage hole adopts the entity element simulation,and the drainage hole is set with large permeability coefficient.The numerical simulation results show that the drainage reduces the lining water pressure,and the nearer the drainage hole is,the smaller the lining water pressure is;conversely,the greater the lining water pressure is.The field test results are in good agreement with the numerical simulation results,which verifies the correctness of the numerical simulation model.The simulation model is applied to the grouting design to increase the thickness of the grouting ring,reduce the permeability coefficient of the grouting ring,and reduce the water pressure of the lining.