胶粉改性土-膨润土固结压缩特性试验

摘要

为增强土-膨润土防渗帷幕对污染物的吸附能力,以废旧轮胎胶粉为土-膨润土防渗帷幕的改性剂,开展胶粉改性土-膨润土材料的固结试验,研究胶粉特征和模拟渗滤液对固结压缩性质的影响规律.研究表明:胶粉改性土-膨润土为中～高压缩性土;由于胶粉颗粒具有不同于黏土颗粒的压缩性和憎水性特征,随着胶粉掺入比的增加,土样的压缩性增强,固结速度增快;胶粉尺寸较大时,土样的压缩性较大、固结速度较快;当胶粉掺入比一定时,模拟渗滤液作用下土样液限降低、结合水量减小、结合水膜变薄,使土样压缩性减小、固结速度增快.%The waste tire ground rubber was used as a modified material,to enhance the contaminants adsorption capacity of soil-bentonite backfill.Based on the consolidation tests of soil-bentonite modified with ground rubber,the effects of ground rubber and simulated leachate on consolidation and compression properties were studied.The soil-bentonite modified with ground rubber was medium to high compressibility soil.As ground rubber particles had different compressibility and hydrophobicity from clay particles,the compressibility and consolidation velocity of the samples increased slightly with the increase of rubber mixing content.For the sample modified with bigger ground rubber,the compressibility and consolidation velocity were larger.When the rubber mixing content is constant,simulated leachate would decrease the liquid limit,the combined water and the thickness of absorbed water,which would reduce the compressibility and increase the consolidation velocity of the sample.