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有限元法在采矿工程中应用以来,给采矿工程的设计和稳定性分析提供了依据和手段,为了更科学地预测顶板冒落,应该对采场的应力分布进行定量的研究,由于采煤工程和地质体本身的复杂性,寻找采场围岩应力分布的解析式目前尚有困难;然而,用有限元法却能提供数值分析的结果。本文以大同云岗矿为例,用三维有限元法分析了综采式采场在采煤工作面推进过程中的围岩应力分布,计算结果说明了这种顶板难冒的原因,为研究大同云岗矿坚硬难冒顶板的岩体改造方案提供了依据,文中并就云岗矿现采煤层中几种典型的顶板模式,分别给出了采场围岩的应力变化分布图,这些模式,对完整结构岩体的采场有一定的代表性。
Finite element method has provided the basis and means for the design and stability analysis of mining engineering since its application in mining engineering. In order to predict the roof caving more scientifically, the stress distribution of stope should be quantitatively studied. Because of the coal mining project And the complexity of the geologic body itself, it is still difficult to find an analytical formula for the stress distribution of the surrounding rock in the stope. However, the finite element method can provide the numerical analysis result. Taking Datong Yungang Mine as an example, this paper analyzes the stress distribution of surrounding rock in the process of coal mining face advancing by the method of three-dimensional finite element method. The calculation results show that the roof is difficult to be caused by the factors This paper provides the basis for rock mass reconstruction plan of hard rock roof in Yungang Mine. In this paper, several typical roof patterns are found in the coal seam of Yungang Mine, and the stress distribution maps of surrounding rock of stope are given respectively. , The complete structure of rock stope has a certain representation.