高速公路下伏采空区剩余沉降量FLAC3D计算方法

采空区剩余沉降量计算是确定采空区危害程度的一种定量方法,其可靠性、准确性和可操作性直接关系到采空区治理方案的选择与评价。根据采空区塌陷冒落带的力学特征,利用横波参数或瑞雷波参数与岩体静力学参数相类比,确定工程岩体参数评价指标。针对采空区冒落带当前特征,使用FLAC3D软件对高速公路下伏采空区剩余沉降量进行计算,并与当前几种采空区剩余沉降计算方法相比较,阐述其优越性。采空区治理后的实测数据表明:该计算方法准确可靠,可为高速公路下伏采空区剩余沉降定量计算提供一条新途径。

A FLAC3D METHOD FOR CALCULATION OF RESIDUAL SUBSIDENCE IN A MINING AREA BENEATH AN EXPRESSWAY

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.