Analysis of the dialectical relation between top c

Authors: Xianzheng Meng Yongjun Xia Bing Tang Yongjiang Zhang

Publish Date: 2009/04/26

Volume: 15, Issue: 2, Pages: 181-187

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Abstract

According to the different engineering mechanical states of top coal caving and normal stoping of gaseous loose thick coal seams the dialectical relation between this caving method and dynamic disasters was analyzed by simulating the change of stress states in the process of top coal initial caving with different mining and caving ratios based on the ANSYS100 The variation of elastic energy and methane expansion energy during first top coal caving was analyzed by first weighting and periodic weighting and combining with coal stress and deformation distribution of top coal normal stoping as well as positive and negative examples in top coal caving of outburst coal seam The research shows that the outburst risk increases along with the increase of the caving ratio in the initial mining stage In the period of normal stoping when the mining and caving ratio is smaller than 13 and hard and massive overlying strata do not exist periodic weighting is not obvious it is beneficial to control ground stress leading type outburst Thus it is unreasonable to prohibit top coal caving in dangerous and outburst prone areas

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