中文摘要：

基于水力劈裂的断裂力学判定准则和有限元判定模拟方法，以假想的直心墙土石坝为例，在考虑心墙内存在裂缝的条件下，计算分析了库水位、裂缝长度、裂缝位置和心墙材料特性（包括弹性模量、泊松比和密度）等因素对土石坝心墙水力劈裂的影响。计算中假定心墙料、坝壳料和裂缝材料的本构关系均具有线弹性特性。结果表明，发生水力劈裂的可能性随库水位的抬高、裂缝长度的增大而增大；随裂缝位置的不同而异。提高心墙材料的弹性模量、泊松比和密度，均有利于提高心墙的抗水力劈裂能力。

英文摘要：

A supposed vertical central core earth-rock dam with horizontal cracks occurring inside was taken an example. The judgment criterion of fracture mechanics and FEM based on hydraulic fracturing were employed for calculation and analysis of the influences of the reservoir water level, the length and position of cracks, and the characteristics of core materials, such as Young＇ s modulus, Poisson＇ s ratio and the density, on hydraulic fracturing of the central core. In the calculation, the linear elastic model was used for simulation of the stress-strain relationships of core material, clam shell material, and the material with cracks occurring. The result shows that the possibility of hydraulic fracturing increases with the rise of reservoir water level and the development of crack length, and that the position of cracks is also an important influence factor. Moreover, the ability of the central core against hydraulic fracturing could be improved by enhancement of Young＇ s modulus, Poisson＇ s ratio and the density of core material.