采动覆岩裂隙发育变化规律研究

为了研究采动覆岩裂隙发育变化规律，建立了基本顶初次来压的力学模型，分析了岩体的变形场方程、岩体损伤演变方程，然后采用RFPA^2D数值模拟软件，研究了覆岩破断裂隙发育变化规律、煤层开采采场应力变化以及煤采空区垂直压应力变化规律。研究得出，随着煤层不断的开采，顶板裂隙带的位置不断向上发育，采场上部的卸压区为拱形，工作面前方的支撑压力峰值逐渐增加。研究为矿井后期开采设计提供了借鉴。

Study on law of development and change of overburden fissures caused by mining

In order to study the law of development and change of overlying strata，this paper analyzes the rotation of the basic top fractured rock mass，establishes the mechanical model of the primary top initial pressure，analyzes the deformation field equation of the rock mass and the equation of rock damage evolution，and then using RFPA^2D numerical simulation software，the development law of overburden fracture and fracture，the change of stope stress in coal seam mining and the variation of vertical compressive stress in coal goaf are studied.According to the research，with the continuous mining of the coal seam，the position of the crack zone of the roof is continuously developed upwards，and the pressure relief zone in the upper part of the stope is arched，and the peak of the supporting pressure in front of the working face is gradually increased.The study has made lessons for the design of mining in the later stage of the mine.