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Abstract The stability of clay aquifuge is the key factor of water conservation mining and water and soil erosion in coal mining. The exploration of new simulation materials and its proportions for clay aquifuge are the basis of the aquifuge stability simulation. Based on the orthogonal tests for the simulation of physico-mechanical and liquid characteristics of clay aquifuge，it is found that the silicone oil is the best additive material for low strength and non-hydrophilic simulation，and the vaseline is the best additive material for plastic deformation simulation，and the clay has important effect on the strength，plasticity，and fissure close feature of simulation materials. Furthermore，a series of tests are carried out for the simulation of the strength，plasticity and the liquid quality of the aquiclude，and the simulation materials and its proportions which can simulate complete stress-strain curve and the water reactivity of aquifuge are obtained. Thus，the technical problems of the plasticity and water reactivity simulation are solved. At last，the solid-liquid coupling simulation experiment of long wall mining face for Yushuwan coal mine is carried out，and the simulation materials and its proportions are proved reliably for clay aquifuge simulation. It is also found from the simulation that the mining induced upward cracks and downward cracks are the key factors of aquifuge stability.
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Received: 03 April 2009
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