石灰岩损伤演化的断裂力学模型及耦合方程

采用断裂力学方法分析裂纹起裂条件 ,建立腐蚀损伤岩体水力 (劈裂 )损伤的演化方程 .水化损伤的演化用矩(碟 )形板模型表示 ,用化学动力学的方法———PWP(Plummer Wigley Parkhurst)方程推导出水化损伤的演化方程 ,在此基础上 ,通过拉剪状态下水化 -水力耦合损伤演化模型 ,建立了水化 -水力耦合损伤演化方程 ,并结合工程实例将其用于耦合损伤条件下应力强度因子和渗透张量的计算

Fracture Mechanical Model and Hydrochemical-hydraulic Coupled Damage Evolution Equation of Limestone

The hydraulic fracture is simulated with a board model,and the fracture threshold and hydraulic fracture evolution equation of which are obtained with the method of fracture mechanics.Then the hydro-chemical damage is also simulated with a board model,the evolution equation of which is deduced by the method of chemical kinetic(Plummer-Wigley-Parkhurst equation).The coupled evolution equation of hydro-chemical and hydraulic damage under tensile and shear stress conditions is obtained on the basis of above deduction.In the end,an example of a deep limestone tunnel in the area with abundant groundwater and high water pressure is presented,in which the coupled evolution equation of the tunnel,together with the coupled evolution of stress intension factor and seepage tensor,are provided.