【作者】 简文星； 嘉门雅史； 金山民政；

【Author】 Jian Wenxing

【机构】 中国地质大学工程学院； 京都大学工程学院环境工程系； 大阪地质研究所；

【摘要】 首先对斑脱土改良粘土衬里(粘土-斑脱土、砂-斑脱土)进行变水头实验,评价粘土衬里的渗透特性。然后对粘土衬里进行持水与水迁移实验,评价粘土衬里水的迁移特性。以水迁移试验为基础,模拟粘土衬里与地基5种不同含水量的条件,对斑脱土衬里进行直接剪切实验,测定斑脱土衬里的剪切强度及粘土衬里与地基接触面的剪切强度。再对粘土衬里进行三轴固结不排水实验,测定其总剪切强度与有效剪切强度。总之,本研究从渗透特性与剪切强度两方面对斑脱土改良的两种粘土作为垃圾填埋场的底层衬里的可行性进行了评价。更多还原

【Abstract】 In this study,Falling head permeability tests were conducted on compacted clay liner (CCL)specimens(sand-bentonite and clay-bentonite mixtures)to obtain the hydraulic conductivity. Water retentivity and water migration tests were performed on the two liner specimens to evaluate the water retention and migration properties from saturated/unsaturated base soil.Based on the above tests,direct shear tests were conducted to obtain the internal shear strength of clay liner specimens and the interface shear strength between clay liner and base soil.These experiments were conducted under five different water control conditions.Test results show that shear strength of both CCL internal and CCL base interface tends to decrease with the water content increasing in CCL and base soil.Triaxial shear tests were also conducted on the two clay liner specimens to obtain total and effective shear strength.The suitability of sand-bentonite and clay-bentonite mixtures as landfill bottom liners was assessed from the viewpoint of laboratory permeability tests and shear strength tests.更多还原