The Application Of Numerical Simulation In Surface Subsidence Prediction

Coal is our country importance of one-time energy, but as the ore bodies were mined, and the stress force around the rock would be destroyed. In this process, Continuous movement and deformation and non-continuous destruction will always with it, and the consequent geological environmental issues result from this process become ever more serious. Our main task is to scientific estimated its range, degrees and speed, so this research is particularly significant.Probability integration method as the most commonly used method in prediction of mining subsidence, and has irreplaceable function to it, but due to the probability integration method can only be expected the surface of the mining area, can not show the formation within the rock stress force and internal arbitrary pointdisplacements, which caused great inconvenience for deeply study the mechanism of mining subsidence, and become development bottleneck of the subsidence theory, so the numerical simulation method came into the areas of mining subsidence. Numerical simulation method is one of the most commonly used methods in geotechnical engineering,and its basic principles is that converted a finite-dimensional space to the infinite-dimensional spacewith discrete structure to replace the continuous structure, and then simulate the real changes in rock mechanics and its displacement.Firstly, in-depth study the theory foundation of mining subsidence, then take the18101working face of the XISHAN mine to the example, and to research and analysis its regularities of subsidence, the step of research are:we should obtain rock mechanics parameters of the mine, mine topographic data and the point coordinates of mining deformation monitoring,the location and geometry of workface and other basic information, use these data to establish solid model with ANSYS and take it into FLAC3D software to analysis and solution, research and simulate rock stress force, deformation and failure mechanism, and then compare with the actual measurement data. Finally, we reaching a conclusion:The model calculation and predication show good agree ment with the trend of ground movement and deformation.