无黏性土层之间渗流接触冲刷机理试验研究  

Mechanism of seepage contact scour between cohesionless soil layers

作　　者：刘杰[1] 

机构地区：[1]中国水利水电科学研究院,北京100048

出　　处：《水利水电科技进展》2011年第3期27-30,共4页Advances in Science and Technology of Water Resources

摘　　要：判别无黏性成层土产生接触冲刷的准则及确定产生接触冲刷的水力比降是研究渗流控制措施的必备要素,为工程界所关注。根据对试验资料的整理与分析,阐明了无黏性成层土产生接触冲刷的几何条件和水力条件,同时建立了产生接触冲刷的临界水力比降与两土层特征粒径的函数关系,可以用来判别无黏性双层土之间是否会产生接触冲刷。如果判明会产生接触冲刷,可进一步计算出产生接触冲刷的水力比降,这对土工建筑物的渗流控制具有指导意义。To distinguish the criteria for contact scour in cohesionless layered soil and to determine the relevant hydraulic gradients are necessary elements for studying seepage control measures.It is a common concern in the engineering field.Based on the experimental data,the geometrical and hydraulic conditions for the generation of contact scour in cohesionless layered soil were illustrated.A functional relationship between the critical hydraulic gradient for the contact scour and characteristic grain size of two soil layers was established.It could be employed to determine whether the contact scour in the two cohesionless soil layers would happen or not.If the potential contact scour was distinguished,the corresponding hydraulic gradient would be calculated.It would be practical for the seepage control of civil structures.

关 键 词：无黏性土 成层结构 渗流 接触冲刷 临界水力比降 

分 类 号：TV139.1[水利工程—水力学及河流动力学]