Abstract：According to the complete stress-strain curve test of clay aquifuge，a new simulation method is put forward considering the peak strain and strength as well as residual strength and strain. Through series of material proportion tests by use of the single-factor analysis method，the aggregate materials and proper agent for materials are obtained；and the proper material proportions are advanced for the complete stress-strain simulation of clay aquifuge. Through the simulation tests of longwall mining of Yushuwan coalmine，the caving feature and subsidence movement of bedrock roof and clay aquifuge of overburden are presented. It is shown that the roof pouring water of mining face is from weathering layer rather than ground surface，which is proven by mining practice. It is also found that there is a main subsidence area behind mining face；and the clay aquifuge trends to lose stability in this area. The subsidence gradient Ts of this area is the key index for aquifuge stability control；and to decrease the Ts or increase the subsidence span is the effective approach of aquifuge stability control. This simulation shows that the water conservation mining can be realized in Yushuwan coalmine；and this research provides a method for water conservation mining in shallow-buried coal seam.
