论文部分内容阅读
本文用平面有限元法计算分析了固结顶板工作面在不同弹模、不同控顶距时围岩应力应变规律。研究表明,胶结层弹模改变对顶板下沉及其破坏方式产生影响,但不一定能改善围岩的应力状态。随控顶距的不同,采场围岩变形、应力相应发生变化。因此,开采期应及时护顶、缩小控顶距,合理确定工作面支护密度及支柱的工作阻力。
In this paper, the plane finite element method is used to calculate and analyze the stress and strain law of the surrounding rock of the consolidated roof working face under different shells and different roof pitches. The research shows that the change of the elastic modulus of the cementation layer has an impact on the roof subsidence and the failure mode, but it does not necessarily improve the stress state of the surrounding rock. With the control of the top of the different stope surrounding rock deformation, the corresponding stress changes. Therefore, during the mining period, the roof should be protected in time so as to reduce the control roof distance and reasonably determine the supporting density of the working face and the work resistance of the pillar.