工作面厚硬顶板力学变形研究

Study on the Mechanical Deformation of Overlying Thick-Hard Rock Layers after Mining

实际生产中,有些矿区覆岩中经常存在两层以上相邻的坚硬顶板岩层。当靠近煤层的二层或多层硬岩层间产生复合效应时,影响覆岩采动特征的老顶将不止一层。为研究清楚复合顶板的变形,有必要研究两层以上坚硬复合岩层的力学特性。基于板理论基础,研究了两层及以上的坚硬层叠岩板的力学特性,建立了坚硬层叠岩板的力学模型并对其进行了分析,给出了最大挠度的计算公式及岩板在覆岩层载荷作用下的变形公式,以及在竖向压力作用下坚硬层叠岩板的位移计算方程、方法,最后给出坚硬层叠岩板的弯曲下沉计算实例。该研究成果为垮落带注充控制岩层及地表移动提供了理论依据。

There are two or more near thick and hard rock plates in the overlying rock layers during mining. In fact, when the compound effect being, there is not only one rock layer affects the characteristic of overlying rock layers. Such as a result, there is need to research the study on the mechanical property of thick-hard rock layers under the press of overlying rock in order to research the deformation of rock layers. The laws is studied of deformation of the two or more thick and hard rock plates, which be pressed by overlying rock. And then the thesis puts forward the mechanical modal of the thick-hard rock layers and analyses the modal＇s features. The formula is given out to calculate the maximum deflection of the thick-hard rock layers and the formula of deformation of roof strata. At the same time the equation and method are advanced to calculate the vertical displacement of thick-hard roof pressed by overlying rock ,which is the theories basis to control the strata and surface subsidence by injecting the caving zoon. At last there is a model being given to calculate the thick-hard roof subsidence.