综放工作面煤柱尺寸对覆岩运移规律的影响研究

Study on Influence Law of Coal Pillar Size on Overlying Strata Movement at Fully Mechanized Working Face

针对江仓娘姆特矿地表覆盖多年冻土层的具体地质条件,通过相似模拟和数值模拟的方法研究了区段煤柱尺寸对煤层覆岩垮落特征和地表多年冻土层变形破坏规律的影响。研究结果表明:煤柱宽度对工作面局部覆岩垮落高度和结构特征均存在一定的影响,但是对覆岩垮落高度的影响不大。随着煤柱宽度增加,地表冻土层的竖直位移量逐渐减小,但水平位移变化不大,冻土层与覆岩之间的离层现象逐渐消失。

According to the geological conditions of Jiangcang Niangmute coal mine surface of permafrost,using the the method of similarity simulation and numerical simulation studies of section coal pillar width on caving characteristics and deformation and failure law of layer.Reasearch shows that the segment coal pillar has certain influence on th＇e damag covereage the effect permafrost e form of overlying strata,but when the mining area increases to a certain extent,the effect is gradually weakened. With the increase of coal pillar width,the vertical displacement of the surface forzen soil layer is gradually reduced,but the change of the horizontal displacement is not very large, separation phenomenon between frozen soil laver and overburden gradually disappeard.