心墙水力劈裂机理的离心模型试验研究  

Centrifugal model study on mechanism of hydraulic fracturing of clay core-wall in rockfill dams

作　　者：冯晓莹[1] 徐泽平[2] 

机构地区：[1]大连理工大学土木水利学院岩土工程研究所,辽宁大连116085 [2]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《水利学报》2009年第10期1259-1263,1273,共6页Journal of Hydraulic Engineering

摘　　要：采用直立土柱试样进行离心模型试验的方法,对心墙发生水力劈裂的条件和过程进行了研究。试验结果表明,当土柱上游侧外水压力大于土体压力时,土柱将产生水力劈裂,并最终产生渗透破坏。因此,在心墙土石坝工程中,由于坝壳对心墙拱作用所导致的心墙土压力小于外部库水压力将是产生心墙水力劈裂的根本原因。The formation conditions and process of hydraulic fracturing of clay core-wall was studied by centrifugal model test. The specimen was a clay column with rectangular cross section. The result shows that the hydraulic fracturing happens to the specimen when upstream water pressure is higher than the earth pressure acting on the soil core, and seepage fracture occurs consequently. It is conclude that in engineering practice, the hydraulic fracturing will occur if the soil pressure of dam shell acting on the c...

关 键 词：水力劈裂 黏土心墙 离心模型试验 

分 类 号：TV131.61[水利工程—水力学及河流动力学]