基于断裂准则的隧道衬砌裂缝稳定性分析

Analysis on stability of cracks in tunnel lining based on fracture criterion

基于混凝土断裂准则,提出了隧道衬砌裂缝稳定系数,采用大型非线性有限元软件ABAQUS,分析了裂缝的深度、宽度、位置、分布密度等参数对隧道衬砌结构稳定性的影响规律。结果表明:裂缝深度对衬砌的稳定性影响最为明显,其次依次是裂缝位置、裂缝分布密度及裂缝宽度;随裂缝深度增大、裂缝位置从拱顶变化至边墙,衬砌的稳定性降低。

Based on fracture criterion,the coefficient of crack stability was proposed. Using the large-scale non-linear finite element software ABAQUS,analyxzed the influence rule of crack depth,width,position,distribution density and other parameters to tunnel lining structure stability. The analytical results are as follows： crack depth has the highest impact on the stability of lining structure,followed by crack location and crack distribution density,and crack width has little influence on the structural stability. With the increasing crack depth and crack location ranging from arch crown to side wall,the structural stability decreases.