摘要
结合大柳塔煤矿活鸡兔井21208工作面开采实例,按采空区层面漏风情况,将采空区顶板岩层冒落划分为自由冒落带、顶板断裂带和地表沙土层带。建立了层面漏风的定解数学模型,将地表漏风强度近似看作按负指数规律衰减。通过用有限元方法求解漏风移动渗流方程,得到采空区冒落带所形成的压力腔与地面之间的压力差形成的采空区层面漏风,漏风强度沿工作面长度方向变化不大,层面漏风强度主要取决于顶板断裂带的尺寸和地表沙土层带的厚度与密实性。
Based on the air leakage condition of bedding plane in gob, combined with the mining example of NO.21208 working face of Huojitu mine in Daliuta colliery, the caving of roof rock strata of gob are divided into three zones, namely free caving zone, roof fracture zone and surface sandy sole zone. The mathematical model with finite solution for bedding plane air-leakage is established, in which the air leakage intensity is regarded as attenuating follows proximately negative exponential law. According to the solution of flow equation of air leakage motion by using finite element method, conclusions can be drawn that the pressure between the pressure chamber formed by gob caving zone and the surface causes the air leakage of gob bedding plane, the air leakage intensity varies little along the length direction of working face, and the air leakage intensity of gob bedding plane is determined by two factors, namely the size of the roof fracture zone and the thickness and compactness of the surface sandy soil zone.
出处
《矿业研究与开发》
CAS
2004年第3期60-62,65,共4页
Mining Research and Development
关键词
浅煤层
采空区
层面漏风
数值模拟
Shallow coal seam, Gob, Air leakage of bedding plane, Numerical simulation
