导水断层防水煤柱合理留设的应力分析计算法

THE METHOD OF STRESSES ANALYSIS AND CALCULATION FOR DESIGNING REASONABLE WATERPROOF COAL BLOCK NEARBY LEADING WATER FAULT

根据导水断层的地质及水文地质条件,在全面考虑影响导水断层防水煤柱尺寸诸因素的前提下,建立了不同的岩石力学模型。应用岩石力学有限元理论(弹塑性)反复解算不同煤柱尺寸情况下的围岩应力及其变化,进而采用“无拉应力分析原理”分析研究在变化的应力状态下煤岩层的稳定性(计算中所用到的参数都进行了合理的修正)。在此基础上,确定出最佳的导水断层防水煤柱尺寸[H_(cb)=F^e(σ^-)|σ^-=R_(trm)]。通过某矿区的实例分析,收到了良好的效果。

In this paper, different mechanical models for rocks are established according to the geological and hydrogeological conditions of the leading water fault, with careful consideration of the various factors which influence the size of the waterproof coal block nearby the fault. Applying finite element method on the theory of rock mechanics. the authors repeatedly calculate the stresses and the changes of the stresses after the coalbed mined on the conditions of different sizes of the coal block. And in addition, the authors analyse and study the stability of the coalbed and the rock formation in a state of changed stresses by No Tensile Stresses Analysis Method. On this basis, much more reasonable size (replaced by H_(biock)) of the coal block is determined H_(block)=[F^e(σ^-) |σ^-=R_(trm)] With further explanation of practical examples of a mine,the results are more idea.