Numerical Simulation on Intervals of Main Roof Weighting

In order to forecast the intervals of main roof weighting,to build numerical model by working face,the influence for the initial and periodic weighting length of the main roof are simulated in the different face advance distance,the initial and periodic weighting length of the main roof during the mining active process is abtained.The results showed that numerical simulation can more comprehensively reveal the stress fields,deformation and failure characteristics,and failure range and depth of rock mass in coal seam floor undermining,these are favorable to select and optimize design mining scheme and reduce the testing time,so improve the economic and social benefits of mines.