ANALOGY SIMULATION METHOD FOR WATER INVASION FORECASTING OF MINING INFLUENCED COAL SEAM FLOOR

Based on characteristics of fully mechanized coal face No.Ⅲ616 of Zhuzhuang Mine,Huaibei Administration,the analogy model is established,simulating stress variation and displacement variation during mining processes.Resultsindicated that as the mining operation from start continued to 40~50 m,the roof strata began fracturing,the difference between compress and pull stresses in the seam floor is maximum.The deformation depth of floor caused by mining operation is up to 16m,becoming dangerous zone for water invasion.Fitting with numerical simulation,the stress variation in seam floor caused by mining is calculated.Selecting Drucker-Prager yield conditions as criterion inferring whether the strata being destroyed or not.The distribution map of the plastic areas in seam floor indicated that as the mining operation continued to 49m,the confined water invasion zone of lower part and mining influenced zone of upper part are connected basically,the water invasion may occurrence.The layout of coal face is designed based on above stated consideration,the correlated preventive treatments are also taken,resulted in fine effect.