双环法测渗透系数在小白杨项目中的应用

Application of Double-loop Method to Measure Permeability Coefficient in Xiaobaiyang Project

土石坝黏性土填筑施工碾压压实后,需要测定其渗透系数,若采用室内变水头渗透试验很难准确测出现场实际黏土心墙料填筑压实后的渗透系数。介绍了用双环法能准确测定黏土心墙料填筑压实后的渗透系数的基本原理、试验流程和具体操作方法,以及试验时的注意事项,用双环法测定黏土心墙料原位渗透系数的方法在小白杨水库土石坝工程黏性土中的实际应用情况。实践表明:用双环法能准确地测出填筑碾压压实后的黏土心墙料的渗透系数。

The permeability coefficient of clayey soil in earth-rock dam should be measured after compaction construction.It is difficult to accurately measure the permeability coefficient of the actual clay core after filling and compacting if the indoor variable water head permeability test is adopted.This paper introduces the basic principle,test flow and specific operation method,and points to be paid attention and application of the double-loop method to measure permeability coefficient in the clay soil of the earth-rock dam project of Xiaobaiyang Reservoir.The practice shows that the permeability coefficient of the core wall material after filling and compacting can be measured accurately by double-loop method.