Experimental Study on Swelling Property and Gas Flow in a Compacted Bentonite-Sand Sample

摘要：

　　This paper focuses on the experimental research on swelling properties gas migration in a compacted bentonite-sand plug.The aim is to investigate the swelling behaviour,gas breakthrough pressure as well as its sealing efficiency.Results show that bentonite-sand swelling is incomplete from 4 MPa gas pressure,so that gas breakthrough occurs at very low pressures(on the order of 1 MPa).Gas permeability of the bentonite-sand plug is affected by the variation in the confining pressure,so that tightness to gas can be achieved at a certain coupled hydro-mechanical condition.Specially,when the confining pressure is equal to 7 MPa and the water saturation degree is 86–91%,gas permeability can decrease to 10-20 m2.

关键词： High-level radioactive waste Bentonite Gas permeability

作者: Hong-Yang Ni Jiang-Feng Liu Jing-Na Guo Xu-Lou Cao Shuai-Bing Song

作者单位: The State Key Laboratory for GeoMechanics and Deep Underground Engineering,and School of Mechanics a The State Key Laboratory for GeoMechanics and Deep Underground Engineering,and School of Mechanics a

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 440-445

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）