摘要
试验研究了三组干密度不同的二元地基粉砂土在四种不同滤网结构下的反滤效果,其中四种滤网结构分别为(1)无滤网、(2)80目单层滤网结构、(3)120目单层滤网结构、(4)一层80目和一层120目滤网组合结构。试验结果表明:土体的渗透系数受滤网目数的影响,滤网目数越大或孔径越小,土体中的渗透性越低,土中的水越难以排出;滤网对粉砂土拦截效果随滤网孔径的减小而越发显著,滤网目数越大,粘连于滤网上的粉砂土越多,穿透滤网随水流而出的粉砂量越少。试验结果为二元地基管井降水中滤网的选取提供了思路和建议。
The filtration effect of silt sand with three different dry densities under four filter structures is studied. These four kinds of filter structures are ① no filter;② 80 mesh single-layer filter structure;③ 120 mesh single-layer filter structure;④ one layer of 80 mesh and one layer 120 mesh filter combination structure. The result shows that the permeability coefficient of the soil is affected by the mesh size, the smaller the pore size, the lower the permeability in the soil. The effect of filter depends on the aperture. The aperture of the filter influences the quality of sand adhere to the filter, and affects the silt erosion. The result of the experiment provides a suggestion for the selection of the mesh filters in the precipitation of the two-dimensional foundation.
出处
《科学技术与工程》
北大核心
2017年第18期309-313,共5页
Science Technology and Engineering
关键词
二元地基
基坑降水
粉砂土
滤网结构
渗透系数
砂土流失量
dual foundation
dewatering
silt sand
mesh filter
permeability coefficient
loss of sand
