充填开采覆岩及地表移动规律数值模拟研究

Study on Numerical Simulation of overburden and surface movement in filling mining

本文在充分了解充填开采的方法和充填开采带来的实际效果是运用这种技术的前提之下,采用FLAC软件分析研究了覆岩性质五参数的变化对覆岩及地表沉降与移动规律的影响。基于此研究为基础,结合某有色金属矿实测地质资料,反演得到岩体力学参数。采用该参数,进行充填开采时地表移动与覆岩移动规律的研究。研究结果表明:固体充填开采方法相比于垮落法开采对上覆岩层移动有较好的控制效果,无论从最终结果还是动态研究都可以肯定这一特点;某些岩层参数与地表下沉有明显关系,而这些关系对于参数反演有重要意义;固体充填的上覆岩层移动较缓慢,活动周期较长;固体充填洞穴壁两侧支承的压力大小和范围均小于垮落开采。

Learning the filling method and its actual results is the premise to apply this technology.This paper was studied by using FLAC3D analysis the way how the change of elastic modulus,poisson’s ratio,tensile strength,cohesion,normal stiffness and shear stiffness affect Strata and surface movement.On this basis,combining with the garden of coal mine geological and mining conditions and the measured data,obtained rock mass mechanical from parameters inversion.Using this parameter to carrie on the numerical simulation of filling mining strata movement,studied the filling miningand the regularity of surface movement.The results show that Solid filling mining method can control the movement of overlying strata more effectively compared with caving method.The final result and research in motion can both prove it.Some rock parameters have obvious relationship with surface subsidence,whith have very important significance for parameter inversion.The overlying strata movement caused by solid filling is slow relatively and has a longer period.The pressure size and scope of coal wall on both sides of the bearing is less than caving mining.