土石坝带裂缝黏土心墙破坏机理试验研究  

Experimental Research on the Failure Mechanism of Clay Core with Cracks for Earth-Rock Fill Dams

作　　者：赵晓龙[1] 邱秀梅[1] 韩惠敏[1] 邱庆泰 卞汉兵[1,2] 

机构地区：[1]山东农业大学水利土木工程学院,山东泰安271018 [2]LEM3,CNRS 7239,洛林大学,法国梅兹57045

出　　处：《中国农村水利水电》2016年第2期134-138,共5页China Rural Water and Hydropower

基　　金：山东省科技发展计划项目(2012GNC11203)

摘　　要：针对土石坝黏土心墙破坏机理的实际特点和物理机制,根据实际工程中黏土心墙所处的应力状态和应力路径的变化,设计了带裂缝黏土心墙的破坏机理试验,探究了裂缝宽度、水压力及反滤层对黏土心墙水力劈裂破坏的影响。结果表明,宽度较小的裂缝在浸水后会闭合,而宽度较大的裂缝则有可能成为土样水力劈裂破坏的通道;一定大小的水压力和加载速率是水力劈裂发生的必要条件;反滤层对于预防水力劈裂破坏的发生具有积极的作用。试验结果对黏土心墙坝体设计有一定的参考价值。According to the actual characteristics and physical mechanism of the clay core failure mechanism in the earth-rock fill dam and the change of stress state and stress path which clay core was under in the practical engineering,a failure mechanism experiment of the clay core with cracks was designed.The influences of the widths of cracks,hydraulic pressure and inverted filter to clay core were explored.The results shown that the cracks with relatively narrow width would close after soaking while the cracks with relatively broad width could become the pathways for hydraulic fracture of soil samples;certain hydraulic pressure and loading rate were necessary conditions for the happen of hydraulic fracture;inverted filter played an active role in prevention of the happen of hydraulic fracture.The test results had certain reference values to the design of clay core wall dam bodies.

关 键 词：土石坝 黏土心墙 破坏机理 裂缝 反滤层 

分 类 号：TV641[水利工程—水利水电工程]