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A FLAC~(3D) METHOD FOR CALCULATION OF RESIDUAL SUBSIDENCE IN A MINING AREA BENEATH AN EXPRESSWAY

WANG Sheng-jun1,JIA Xue-min2,HAN Wen-feng1,3,CUI Su-min1(1.College of Earth and Environment Sciences,Lanzhou University,Lanzhou 730000,China;2.Department of Underground Engineering,Shijiazhuang University of Economics,Shijiazhuang 050031,China;3.Department of Civil Engineering,Tianjin Institute of Urban Construction,Tianjin 300381,China)  
The calculation of residual subsidence in mining area is a quantitative method to evaluate hazards rank derived from the mining area.The reliability,accuracy and operation of the calculation directly affect the choice and assessment of the scheme for reinforcing mining areas.Based on the mechanical characteristics of collapse,the parameters of traverse wave or Rayleigh against static rock mass are used to determine assessment indices for the parameters of engineering rock mass.Under the current status of collapse of a mining area,FLAC3D software is used to calculate and evaluate the residual subsidence of the mining area beneath an expressway;and the advantage of the method is discussed as compared to other calculation methods of residual subsidence.Through a case study of a reinforced mining area,the testing data show that the proposed method is accurate and reliable,and it can provide a new way to evaluate and calculate the residual subsidence in mining area beneath an expressway.
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