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基于岩石碎胀特性对浅埋采空区垮落岩体空隙储水工程的重要意义,采用理论分析、数学建模与现场应用相结合的方法,对神东矿区某矿32302工作面采空区垮落岩体应力变化与碎胀系数分布规律进行研究.分析覆岩“两带”结构特征,划分采空区垮落岩体应力和碎胀系数分区.根据悬臂梁及弹性地基梁理论,推导各分区垮落岩体应力变化公式,建立碎胀系数分布模型,并利用岩石压实实验进行验证.应用数学模型计算32302工作面采空区垮落岩体空隙储水体积为5 700 651.68m3,与岩移法估算结果较为接近,误差仅为7.14%.结果表明:针对浅埋煤层赋存条件,运用数学方法分析采空区垮落岩体碎胀特性是可行的,促进岩石碎胀特性研究方法多元化发展,为浅埋采空区垮落岩体空隙储水量预测提供新的途径.
Based on the importance of rock fragmentation characteristics to the cavernous water storage project in caving mined-out area with shallow gob, theoretical analysis, combination of mathematical modeling and field application are used to analyze the gob area of 32302 face of a mine in Shendong Mining Area The research on the stress distribution and the coefficient of the coefficient of the broken expansion of the caving rockmass.The structural characteristics of the overlying strata and the “two belts” are analyzed to classify the stress and coefficient of expansion coefficients of the caving rockmass in the goaf.According to the theory of cantilever beam and elastic foundation beam , The formula of stress variation of caving rock mass in each subarea was deduced and the model of distribution coefficient of coefficient of caving was established and verified by rock compaction test.The void volume of caving rock mass in goaf of 32302 working face was calculated as 5 700 651.68 m3, which is close to the result of rock migration method, and the error is only 7.14%. The results show that it is feasible to analyze the characteristics of broken rock mass expansion in goaf by mathematical method, The diversified development of the characteristics research method provides a new way to predict the water storage of the cavernous rock mass in shallow goaf.