摘要
通过比例为1∶100的有机玻璃模型槽进行模型试验,模拟二元堤基条件及不同防渗墙深度下,堤基内管涌的发生和发展过程.利用拍照还原等方式,得到管涌口出砂面积;并采用彩色砂作为示踪材料,切片观察测量管涌发生后试样的局部剖面.从而验证了二元结构堤基的渗透破坏模式为:首先在上层弱透水层中发生流土,然后在强、弱透水层之间发生自下游向上游的逐步潜蚀冲刷.并且从试验得到了一些悬挂式防渗墙深度及堤基土密度与管涌发展之间的定量关系.
A model test in an organic glass flume with a scale of 1 ： 100 was performed to demonstrate the generation and evolution of piping in embankment foundation with different depths of cut-off wall. The area of sediment outflow caused by piping was obtained by photo reproduction, and the local cross-sections of samples after the occurrence of piping were observed and measured with colored sediment taken as tracers. Thus, the piping-induced failure of two-layer foundation was verified as that： mass flow firstly appears in the upper weakly permeable layer, and then underground erosion and scouring gradually occur from downstream to upstream between the serviously and weakly permeable layers. Moreover, the quantitative relationships among the depths of hanged cut-off wall, the density of foundation soil, and the piping evolution were also derived from tests.
出处
《水利水电科技进展》
CSCD
北大核心
2005年第6期21-24,共4页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金与长江水利委员会联合资助项目(50099620)
关键词
堤基
管涌
潜蚀
接触冲刷
流土
模型试验
embankment foundation
piping
underground erosion
internal scouring
soil flow
model experiment
