论文部分内容阅读
为对上覆岩层冒落的危险性进行有效评价,在工程实勘的基础上,将石膏矿上覆岩层的自然冒落作为一个逐级发展的过程来处理,并根据普氏平衡拱理论对各级拱形作出2点假定,即冒落拱顶部弧线为抛物线,矿柱按θ角剥蚀。提出以临界松散系数K作为其危险性评价因子,并根据所建立的一般冒落拱模型,分别推导得到条带矿柱及间隔点柱区域关于K的计算公式。最后,将该评价因子用于工程实际,实现对邵东石膏矿采空区的危险性分级。该评价体系,即可对石膏矿地表塌陷作出有效预测,也可对石膏矿地表危险程度进行合理分级。
In order to effectively evaluate the danger of the overlying strata caving, on the basis of practical engineering survey, the natural caving of the overlying strata of gypsum mine is treated as a stepwise development process. According to Platts equilibrium theory Arches at all levels to make 2 assumptions, that is, the cambered arch cambered line for the parabola, ore column erosion by angle θ. The critical loose coefficient K is taken as the risk evaluation factor. According to the established general arched arch model, the formula for calculating K about the strip pillar and the interval pillar column is deduced separately. Finally, the evaluation factor is used in engineering practice to realize the hazard classification of the gob of Shaodong gypsum mine. The evaluation system can effectively predict gypsum mine surface subsidence, and also can reasonably grade the ground surface gypsum mine risk.