摘要
总结比较并分析几种土石坝心墙水力劈裂分析判定方法,即总应力法、综合法和有效应力法,分析各种方法的优缺点。结合瀑布沟、两河口心墙堆石坝,利用这几种方法分别进行心墙水力劈裂分析,比较各种方法之间的差异,论证综合法的合理性。建议合理的总应力法或综合法的水力劈裂判定准则,指出目前常用有效应力分析法的不足与改进方法。定义一种判定水力劈裂的安全系数,可方便利用此系数进行水力劈裂判定及不同方法比较。3种方法计算的心墙抗水力劈裂安全系数表明,有效应力法的安全系数较大。所分析的两土石坝心墙能够满足抗水力劈裂要求。
Three methods for analyzing hydraulic fracturing of earth-rockfill dam core are described and compared, i.e. total stress method, synthesis method and conventional effective stress method. The merits and limitations of those methods are discussed. The analyses of hydraulic fracturing for Pubugou earth dam and Lianghekou earth dam are carried out using these methods; and the differences in these methods are investigated. The rationality of synthesis method is demonstrated. Some rational criteria of hydraulic fracturing for the total stress method and the synthesis method are suggested; and the shortage and improvement of the conventional effective stress method are pointed out. A new factor of safety for hydraulic fracturing is defined; and it can be conveniently used to assess the safety of dam core hydraulic fracturing. The newly defined factors of safety from different methods are used to check the capability of Pubugou earth dam to prevent hydraulic fracturing. The safety of against hydraulic fracturing for the two dams is confirmed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第7期1380-1386,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
水电工程
土石坝
水力劈裂
总应力法
有效应力法
综合法
hydraulic engineering
earth-rockfill dam
hydraulic fracturing
total stress method
effective stressmethod
synthesis method
