填埋场压实粘 土衬垫防干裂试验研究

对加不同砂量的粘土、砂土混合土料进行颗粒分析试验、击实试验、三轴渗透试验和体积收缩试验，研究加砂量对渗透第数、体积收缩率的影响。试验结果表明：当粘土中加砂量30%～40%时，混合土料击实后可同时获得透水性和低收缩势，从而可较好地解决填埋场施工过程中压实粘衬垫的干裂问题，当土料防渗、收缩特性在低压实能下不能满足要求时，可通过提高压实能加以改善。

Experimental Research on Preventing Desiccation Cracking of Compacted Clay Liner in Municipal Solid Waste Landfill

Grain size analysis tests,Proctor compaction tests,triaxial permeability tests and volumetric shrinkage tests are performed for several soil specimens with different sand contents. The effect of sand content on hydraulic conductivity and volumetric shrinkage strain is studied.Test results show that:if the sand content in clay is in the range of 30% to 40%,the mixture after compaction will obtain low hydraulic conductivity and low shrinkage potential,so the desiccation cracking problem of compacted clay liners during construction is solved relatively successfully;when the hydraulic conductivity and shrinkage potential of the soil are not satisfied under low compaction effort, they can be improved by increasing compaction effort.