重力坝坝踵的断裂分析

本文用有限元与半平面边界元耦合法计算了坝体坝基应力,又结合边界配置法求出了坝踵应力强度因子。根据混凝土V型切口复合型断裂准则确定了坝踵初裂方向,在此基础上。对裂纹沿坝基的扩展作了计算分析。结果表明,裂纹内的水压力是促使裂纹扩展的重要因素,减小或消除坝基的缝水压力将有助于坝基裂纹的稳定。

Fracture Analysis to Dam Heel of Gravity Dam

In this paper, the stresses of gravity dam and dam foundation are calculated by the coupling method of finite element and half plane boundary element. Then, the stress intensity factors are obtained by the boundary collocation method. According to the V-notch mixed fracture criterion, the initial fracture angle of dam heel is determined. On the basis of the works, further research is made on the development of cracks towards the dam foundation. The results show that water power in the cracks is important factor which cause cracks extension. Eliminating or reducing water power in cracks will be beneficial to steadiness of dam foundation.