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对2种不同赋存条件下的浅埋煤层工作面进行了流固耦合相似模拟实验,实验研究表明,主关键层下岩层的运动破坏规律是下位逐层垮落而上位整体运动.影响浅埋煤层导水裂隙发展的主要因素是主关键层层位和采高,主关键层位与采高之比越大,越容易进入弯曲下沉带,当其层位距离煤层顶板的高度与采高满足kc≥11时,主关键层进入弯曲下沉带,也就是裂隙带与采高之比k≥12时,裂隙才可能停止发展.并且随着工作面的推进,围岩的渗流状况由原生裂隙逐渐向变形裂隙和导水裂隙过渡.
Similarity experiments of two kinds of shallow coal seam face under different conditions are carried out. The experimental study shows that the law of rock failure under the main key layer is that the lower part of the coal seam collapses layer by layer and the upper part moves in the same direction. The main factor for the development of coal seam hydraulic fractures is the main key beds and mining height. The greater the ratio of the main key beds to the mining height, the easier it is to enter the curved sink belt. When the height of the layers from the coal seam roof and the height of the mining floor When the kc≥11 is satisfied, the main critical layer enters into the bending sink zone, that is, the ratio of fracture zone to mining height k≥12, the fracture may stop developing.And with the advancement of working face, the seepage condition of surrounding rock is changed from primary Cracks gradually to the deformation of fissures and water transfer fissures transition.