FLOW-SOLID COUPLING SIMULATION METHOD ANALYSIS AND TIME IDENTIFICATION OF LAGGING WATER-INRUSH NEAR MINE FAULT BELT
(1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；2. Key Laboratory of Geological Engineering Centre of Guangxi，Guilin University of Technology，Guilin，Guangxi 541004，China；3. College of Earth Sciences，Guilin University of Technology，Guilin，Guangxi 541004，China)
Abstract：The lagging water-inrush near mine fault belt is the main type of water damage threatening the deep coal mining. Based on the flow-solid coupling theory，three types of simulation model including the elasticplastic strain-seepage coupling model，the rheology-seepage coupling model and the variable parameter rheology-seepage coupling model were proposed. Regarding the materials of fault zone as equivalent continuum model，using elasticplastic model and rheological model as material constitutive model respectively，a numerical simulation was carried by using FLAC3D. The results show that the simulation of the elasticplastic strain-seepage coupling can be applied to some circumstances；the rheology-seepage coupling is the closest to reality；under the condition of the variable permeability，the variable parameter rheology-seepage coupling gives the best explanation to the mechanism of permeability parameters changing. Taking the rheology-seepage coupling model for example，the most dangerous time occurring possible lagging water-inrush can be identified better. In the three mining stages simulated，the highest water pressures of 3.26，3.63，3.77 MPa are generated separately near rock roadway，i.e.，at the location of model observation point #8，corresponding to lag times of 15，131，546 d respectively.
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2011, Vol. 30 
