土石坝心墙水力劈裂分析

简要分析了水力劈裂的发生条件、力学机理。基于水压楔劈机理，利用有限元方法建立了一种水力劈裂的发生判定方法。该方法假定心墙预先存在局部渗透弱面（裂缝），通过将裂缝位置的单元材料改为裂缝软材料，考虑库水进入裂缝后对裂缝周围土体的作用，建立水力劈裂分析的平面有限元模型，确定裂缝端部垂直于裂缝面的正应力，进而依据该正应力判断水力劈裂发生的可能性，该方法同时可模拟水力劈裂的发展过程。

Analysis of hydraulic fracturing of core of earth-rock dam

The induced condition and mechanical mechanism of hydraulic fracturing is briefly analysed. Based on the triangle fracturing under water pressure and finite element method, an approach is suggested to judge the occurrence of hydraulic fracturing. In this approach it is assumed that there exist local permeable weak planes (cracks) in core; and the plane finite element method (FEM) for hydraulic fracturing analysis is established. The crack is taken as a soft material; and the effect of water pressure acting on both sides of the crack is modeled. By using FEM, the stress of element at the crack tip is obtained; and the possibility of hydraulic fracturing is judged. This approach can also simulate the development of hydraulic fracturing.