岩土工程学报Issue(12)：2213-2219,7.DOI:10.11779/CJGE201412008
多层堤基中土层结构变化对管涌影响的试验研究
Experimental researches on effect of foundation structure on piping in multilayer embankment
摘要
Abstract
The situations of the occurrence and development of piping are different because of different soil layer structures of embankment. Based on the laboratory tests, the destruction processes of piping of multilayer embankment with three kinds of different sand layers are simulated. By changing the grain-size distribution of the underlying sand layers, the effect of sand layers with different grain-size distributions on the mechanism and process of the occurrence and development of piping is analyzed. The test results show that when the sand layer of multilayer embankment is fine sand, it bears larger water pressure, and the critical hydraulic gradient is high. Once piping occurs, the seepage discharge, erosion mass and damage range are large. The piping failure of this kind of embankment is sudden and dramatic, and prevention measures should be taken as early as possible. When the sand layer is coarse sand, the situation of piping is like that of sand gravel layer. The damage scope of piping is confined to the top of the gravel layer, and the damage depth is limited. When the sand layer is fine gravel, the critical hydraulic gradient is small, the damage extent gradually increases, and the speed of piping is quick because large amount of erosion embankment can generate obvious seepage deformation.关键词
管涌/多层堤基/临界水力梯度/土层结构/模型试验Key words
piping/multilayer embankment/critical hydraulic gradient/soil structure/model test分类
建筑与水利引用本文复制引用
陈建生,张华,王霜,何文政,袁克龙..多层堤基中土层结构变化对管涌影响的试验研究[J].岩土工程学报,2014,(12):2213-2219,7.基金项目
江苏省普通高校研究生科研创新计划项目(CXZZ13_0243) （CXZZ13_0243）
