粉煤灰堆场膨润土改性黄土衬里的击实性能研究  

Study of Compaction Performance of Bentonite-Modified Loess Soil Liner for Fly Ash Stockpile

作　　者：赵天宇[1] 吴军荣 张虎元[1] 严耿升[1] 冯蕾[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《粉煤灰》2010年第2期28-32,共5页Coal Ash China

基　　金：国家科技支撑计划课题(2006BAK30B02);"改性黄土衬里关键技术研究"项目资助

摘　　要：以陕西省榆林市榆横煤化学工业区粉煤灰堆场工程为依托,选取黏性较大的兰州黄土和砂性较大的榆林黄土两种代表性黄土,分别向其中添加不同比例的两种膨润土作为改性衬里材料,通过室内试验对比研究了膨润土改性黄土的击实性能。研究表明,在添加率较小的情况下,膨润土细颗粒充填于黄土大颗粒架空空隙中,改性黄土最大干密度随膨润土添加率增大呈急剧上升趋势,当架空空隙完全被充填后改性黄土的干密度随膨润土添加率增大而缓慢降低。由于黏粒含量不断增加,改性黄土的最优含水量随膨润土含量增加呈线性增长规律。Based on yulin-hengshan coal chemical industry project in yulin,Shanxi province,two kinds of bentonites,Lanzhou loess soil and Yulin loess soil were added with different mix ratio as modified liner for stockpile.Research shows that the maximum dry density of bentonite-modified loess soil tends to a sharp increasing in a low bentonite addition levels because bentonite fine-grain was filled in loess large voids,and then the maximum dry density slowed down when the voids were filled completely.Due to the increasing of clay particle content,the optimum water content of bentonite-modified loess soil was increased linearly with the increasing of bentonite addition levels.

关 键 词：改性黄土 膨润土 最大干密度 最优含水量 

分 类 号：TU528.5[建筑科学—建筑技术科学]