心墙堆石坝水力劈裂可靠性分析方法及应用  

Reliability Analysis Method for Hydraulic Fracturing in Earth Core Rock-Fills Dam and Its Application and Its Application

作　　者：姬耀斌 魏海[2] 吴凤昌 

机构地区：[1]浙江省地球物理地球化学勘查院,杭州310015 [2]河海大学水利水电工程学院,南京210098

出　　处：《中国农村水利水电》2010年第4期85-87,90,共4页China Rural Water and Hydropower

摘　　要：首先利用水力劈裂判断准则,构造心墙水力劈裂功能函数;然后根据坝体材料物理参数的概率分布类型,采用几何法计算心墙水力劈裂可靠指标,得出心墙发生水力劈裂的概率。实例分析结果表明,蓄水初期,心墙上游面中部发生水力劈裂的概率较顶部和底部大;随着心墙材料的泊松比、密度变异性的增加,心墙发生劈裂破坏的概率也相应增加;弹性模量对心墙水力劈裂影响程度较小;降低蓄水速度可以降低心墙发生水力劈裂的概率。Firstly hydraulic fracturing criterion is used to construct the function of hydraulic fracturing in the earth core.Then according to probability distribution of physical parameters of dam materials,reliability index of hydraulic fracturing in the core is calculated through the geometry method,and probability of hydraulic fracturing can also be obtained.Taking one earth core rock-fill dam for example,the results suggest that the probability of hydraulic fracturing in the middle of upstream face of the core is greater than at the top and bottom.The probability of hydraulic fracturing increases with great variability of Poisson＇s ratio,density of core materials;and elastic modulus of earth core has little effect on hydraulic fracturing;decreasing water filling rate in reservoir can reduce the probability of hydraulic fracturing in the core.

关 键 词：可靠性分析 心墙 水力劈裂 变异性 

分 类 号：TV641.41[水利工程—水利水电工程]