为研究宽级配砾质土的渗透特性,对不同砾石含量的宽级配砾质土进行了一系列的三轴渗透试验。试验结果表明随砾石含量的增加,宽级配砾质土的结构分别为悬浮-密实、密实-骨架、骨架-空隙3种形式;随砾石含量的增大,渗透系数呈现出先略微减小然后逐渐增大、最后迅速增大的变化规律;含水率、干密度均对宽级配砾质土的渗透系数有较大的影响;在最优含水率左右,渗透系数有明显的差异,施工中应注意对含水率控制。

In order to study the permeability characteristics of the broadly graded gravelly soil, triaxial seepage tests in the presence of different gravel contents. The test results show that, with the increasing gravel content,the structure types of the broadly graded gravelly soil can be divided into three different kinds,including suspend-dense structure, dense-framework structure and framework-pore structure. When the gravel content increases, the permeability coefficient decreases slowly first, then increases slowly, and increases quickly finally. Dry density has main influence on permeability coefficient, so does the moisture content. The permeability coefficient is obviously different near the optimum moisture content, so we should pay attention to controlling the moisture content in construction.