Gas Breakthrough of Compacted Bentonite/Sand-Argillite Interfaces

摘要：

　　This paper focuses on gas breakthrough tests through bentonite-argillite interface.The main contribution of our study is to provide insights into the swelling kinetics,gas breakthrough pressure of these materials.During the tests,bentonite/sand plugs and bentonite-argillite plugs are used to perform swelling tests and gas breakthrough tests.Experimental results show that continuous gas passage through fully saturated bentonite/sand is not obtained until 10.5 Mpa gas pressure.When a bentonite/sand plug swells inside a smooth metal tube,gas passage occurs at 7–8 Mpa,which is similar to the effective swelling pressure of bentonite,as measured by independent swelling experiments.For argillite alone,saturated with water until sealing(water permeability on the order of 10-20–10-21 m2),gas breakthrough may occur at as low a pressure as 0.2 Mpa and up to 6 Mpa for undisturbed argillite.Finally,also after full water saturation,continuous gas breakthrough through the bentonite-argillite interface is detected at between 7 to 8 Mpa gas pressure.It is interpreted that the argillite rock or the bentonite-argillite interface are both preferential pathways for gas migration when all materials become fully saturated.

关键词： Swelling clay Bentonite-sand plug Argillite Bentonite/argillite interface Gas breakthrough

作者: Shuai-Bing Song Jiang-Feng Liu Xu-Lou Cao Yong-Gui Chen Hong-Yang Ni Jia-Rui Zhang Yan Ma

作者单位: Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji Universit Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji Universit 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: 454-460

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）