压缩过程中粗粒土渗透性变化的试验分析

为了研究影响粗粒土渗透系数大小的因素,采用实际工程用砂,通过不同条件下室内渗透试验,分别研究了粗粒土的粒径大小、干容重及相对密实度对渗透系数的影响。结果表明:对于同一粒度成分的粗粒土而言,其渗透系数随干容重的增加而减小,随相对密实度的增加而减小;在粗砂粒范围内,渗透系数随均值粒径的增大而快速增大;在细砾土粒径范围时,渗透系数随均值粒径增大的现象不显著。研究结果表明压缩作用使砂粒土渗透系数的减小较为显著,而对细砾土渗透系数的影响不明显。

Experimental analysis of permeability coefficients changes of coarse grained soil during compression

In order to study the factors affecting the permeability coefficients of coarse grained soils, the sands used in actual engineers were applied , through the indoor permeability tests, different test conditions were used to study the effects of particle size, dry bulk density and relative compactness on permeability coefficients of coarse grained soils. The results showed that: for the same particle size composition of coarse grained soil, the permeability coefficient decreased with the increases of the dry density and the relative compactness. In the coarse sand range of average particle size, the permeability coefficient increased rapidly as the particle size increased, and when the average particle size was in the range of fine gravels, the permeability coefficient varied littleincreased as particle size increased. This research indicated that compression decreased permeability coefficients of coarse sand significantly, while affected permeability coefficients of fine gravels little.