Abstract：An experimental study was carried out on the compacted samples of Gaomiaozi(GMZ) bentonite. In order to do this，a self-made multifunctional swell and permeability apparatus was developed in the laboratory. The swelling tests and permeability tests were both performed with respect to different initial dry densities and different widths of joints. After hydration tests，the mercury intrusion porosimetry(MIP) test was carried out to study the influencing mechanism of joints on the permeability of bentonite. The results show that the existence of joints will lead to expansion force of bentonite decreases，the permeability increases and thus reduce the self-sealing performance of bentonite in the engineering barrier of repository. During the hydration processes，the existence of joints will change the size and quantity of pores in bentonite and cause its permeability increase macroscopically.
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2012, Vol. 31 
