混凝土重力拱坝下游面裂缝断裂稳定性初析

Analysis of Fracture Safety of Downstream Face Crack in a Concrete Gravity Arch Dam

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。

n the basis of the theory of linear-elastic ftacture mechanics, the downstream face crack in a concrete gravity arch dam is regarded as a boundary condition and the crack bank displacement,crack end stress and far field stress under the action of water pressure and temperature are calculated by three dimensional finite element mothed.Then the stress intenslty factor of the crack end is found out by displacement mothed and stress concentration mothed. Through processing and analysis of the test data,a mathematical relation between the critical stress intensity factor and the depth of the crack(c/w=constant)is established by non- Iinear parameter estimating mothed.Through extension. the fracture safety of thecrack is differentiated.