Cracking induced by drying or construction often occurs in compacted clay liner in landfill seepage control system. It is possible to provide preferential channels for the breakdown of the leachate, so as to pollute the groundwater and the surrounding environment. Relatively high stress in compacted clay is caused by a large amount garbage, which is worth studying whether cracked clay will close under the pressure and how the permeability of the clay will change after crack closure. According to the above problems, this paper carried out the experiment of the two clays specimen preparation of cracks under different water content and the closure of cracks under consolidation pressure. The test results showed that crack width deceased with the increase of consolidation pressure. Clay-J cracks were easier to close than Kao-H under the same water content and consolidation pressure. When consolidation pressure reached the closure pressure, the hydraulic conductivity of two cracked clays after the closure could recover to original hydraulic conductivity. The tracer solution was used to test the crack in different closing states. It is found that there was no preferential flow after crack closure, which ensure the long-term service of anti-seepage system.
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