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目前,我国石门揭煤工作面突出事故仍时有发生。为了研究石门揭煤工作面煤与瓦斯突出(以下简称“突出”)预测问题,首先,根据工作经验指出我国《防治煤与瓦斯突出规定》中2种预测方法(综合指标法、钻屑瓦斯解吸指标法)存在的不足,即预测指标缺乏理论依据、临界值往往难以通过试验考察确定;其次,建立了石门揭煤工作面突出预测的物理模型,认为突出主要是爆破卸压增渗与瓦斯渗流产生的剪应力达到了煤体的剪切强度所致(突出的必要条件而非充要条件);第三,采用变分法求解强非线性一维平面瓦斯渗流偏微分方程,获得包括非线性特性的自模拟解(近似解析解);最后,利用自模拟解等建立了石门揭煤工作面突出预测的临界条件,得到了瓦斯压力的临界值p0max与煤的坚固性系数f的平方成正比的结论。介绍了俄罗斯现行防突指南中的临界条件(p0max<1.4f2)及有关情况,建议作为综合指标法等的辅助指标用于石门揭煤工作面突出预测,也可供斜井、立井揭煤工作面突出预测参考。
At present, our country Shimen exposed coal face accidents still occur from time to time. In order to study the prediction of coal and gas outburst in the coal face of Shimen coal seam, firstly, according to the work experience, the two prediction methods (comprehensive index method, drill cuttings Gas desorption index method), that is, the prediction index lacks a theoretical basis, and the critical value is often difficult to determine through experiments. Secondly, the physical model that predicts the outburst of Shimen coal- The shear stress produced by gas seepage reaches the shear strength of coal (the necessary and not necessary conditions are highlighted). Third, the variational method is used to solve the strong nonlinear one-dimensional planar seepage partial differential equations of gas seepage. (Approximate analytic solution). Finally, the critical conditions of outburst prediction of cross-section coal face are established by means of self-modeling solution and the square root of gas pressure p0max and coal solidity factor f To be proportional to the conclusion. The critical conditions (p0max <1.4f2) in Russia’s current anti-salvage guidelines are introduced, and the relevant indicators are suggested to be used as an auxiliary index for the comprehensive indicator method to predict the open cross-section of coal face in Shimen, Surface prominence prediction reference.