通过人工配制不同含砂率粉土,分别对其进行击实试验(对击实后试样进行电镜扫描)、压缩试验、CBR(California Bearing Ratio)试验和无侧限抗压强度试验,研究含砂率对粉土性质的影响。结果表明:含砂率相同粉土的击实试样的孔隙面积随着含水率的增加先减小后增大,在相同含水率下试样的孔隙面积随含砂率增加先减小后增加,这刚好与得到的粉土的最大干密度随着含砂率的增大先变大后减小的结果一致;对相同含砂率粉土而言,无侧限抗压强度随着粉土压实度增加而增大,但同一压实度下粉土的无侧限抗压强度随着含砂率的增加越来越小。

The impact of sand ratio on silt property was investigated through compaction test (before SEM scanning), compression test, CBR test and unconfined compressive strength test on artificial silt with different sand ratios (10%, 20%, 30%, 40% and 50%). Results indicated that 1) given the same sand ratio, the pore area of compacted silt samples declined at first and then increased with the growth of water content; given the same water content, the pore area of the samples also decreased at first and then increased with the increase of sand ratio, which agrees well with the variation of maximum dry density of the silt samples (increased first and then decreased with the increase of sand ratio); 2) as sand ratio and coarse grain content became larger, the CBR of silt increased with the increase of sand ratio; 3) for silt with the same sand ratio, unconfined compressive strength increased with the increase of compaction degree; but under the same compaction degree, unconfined compressive strength became smaller with the increase of sand ratio.