混凝土重力拱坝下游面裂缝断裂稳定性初析

• 作 者: 沈长松 陆绍俊 林益才
• 出 处: 河海大学学报
• 发表日期: 1995年01期
• 关键词: 重力拱坝 下游面 应力强度因子 关系表达式 线弹性断裂力学 位移分量 温度作用 断裂韧度 工程试验 水工结构

根据线弹性断裂力学理论，将裂缝作为边界条件，应用空间有限无法计算陈村重力拱坝下游面１０５高程的大裂缝（以下简称１０５裂缝）在水压和温度作用下的缝岸位移和缝端及远场应力。继而分别采用直接法和应力集中法计算缝端应力强度因子。通过对类似工程试验资料的归纳处理，用非线性参数估计法建立临界应力强度因子与裂缝深度的数学关系表达式，通过处延，从而判别１０５裂缝的断裂稳定性。

According to the theory of linear elastic fracture mechanics, the crack is used as the boundary condition, and the application of finite space can not calculate the joint displacement and seam fracture of 105 large fractures (105 fissures) downstream of the Chencun gravity arch dam under water pressure and temperature And far-field stress. Then, the stress intensity factor at the seam end was calculated by direct method and stress concentration method respectively. Through the induction processing of similar engineering test data, the nonlinear relationship between the critical stress intensity factor and fracture depth was established by nonlinear parameter estimation method. The fracture stability of fracture 105 was determined by extension.