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.
出处
《中国农村水利水电》
北大核心
2010年第4期85-87,90,共4页
China Rural Water and Hydropower
关键词
可靠性分析
心墙
水力劈裂
变异性
reliability analysis
core
hydraulic fracturing
variability
