岩土力学Issue(10)：2838-2844,2887,8.
单一裂隙优势渗流对黏土层防渗性能的影响分析
Influence of preferential flow induced by a single crack on anti-seepage performance of clay barrier
摘要
Abstract
The waterproofing properties of compacted clay barrier at landfill site will be greatly weakened by crack which is induced by the waste’s differential settlement. In order to reveal the effects of preferential flow on the anti-seepage performance of cracked barrier, the crack is treated as high-permeable porous medium, and a simplified saturated/unsaturated seepage model of the barrier with a single crack is developed to study the process of preferential flow. In addition, the influence of crack position, depth, width and permeability coefficient on the anti-seepage performance of the barrier is comparatively analyzed. The results show that the infiltration process can be divided into three stages:early stage, penetrating stage and steady stage. Besides, the bottom crack has little influence on the barrier’s anti-seepage performance, but it is greatly affected by upper or fully penetrated crack. The breakthrough time will be significantly shortened with crack depth increasing until the crack is thoroughly penetrated;and it is better to keep the crack depth under 0.1 time of the barrier’s thickness to ensure its anti-seepage performance. What’s more, with the increase of crack width and permeability coefficient, the water breakthrough time will be rapidly shortened and the steady leakage will increase respectively; and they tend to be stable when they are reaching a certain value. It also shows that the barrier’s anti-seepage performance would significantly deteriorate as soon as the crack is fully penetrated;and the steady leakage will increase linearly with the increase of crack width and permeability coefficient.关键词
垃圾填埋体/压实黏土层/裂隙/优势渗流/水分击穿时间Key words
MSW landfills/compacted clay barrier/crack/preferential flow/water breakthrough time分类
建筑与水利引用本文复制引用
蔡武军,凌道盛,徐泽龙,陈云敏..单一裂隙优势渗流对黏土层防渗性能的影响分析[J].岩土力学,2014,(10):2838-2844,2887,8.基金项目
国家重点基金研究发展计划(973计划)项目(No.2012CB719805)。 （973计划）
