8.5 m大采高工作面矿压显现规律相似模拟研究

Similar simulation study on mine pressure behavior law of 8.5 m high mining face

为了确定特厚煤层覆岩的矿压规律和支架工作阻力变化,根据煤层所处地质条件,基于相似三定理,在实验室采用平面相似模拟的方法,研究了浅埋特厚煤层大采高综采条件下的工作面上覆岩层破断、来压步距和支架阻力及周期来压规律。结果表明:当正常割煤时,直接顶初次垮落步距为23m,基本顶初次垮落步距为38 m,周期垮落步距为17 m;当工作面矿压显现强烈时,支架最大工作阻力为24 000 kN左右,覆岩垮落会形成宽度12～20 m岩柱;支架最大阻力出现在关键层失稳时,最大来压出现在第4、5次周期来压期间,同时工作面的停滞导致支架阻力明显增加。研究为特厚煤层工作面支护工艺技术水平的提高提供了技术参考。

In order to determine the mine pressure law of the extra-thick coal seam overburden and the change of the working resistance of the support,according to the geological conditions of the coal seam,and the similar three theorem,the laboratory plane similar simulation method was used to study the overburden breaking,the pressure stepping distance,the support resistance as well as the periodic pressure law of the working face under the conditions of fully-mechanized mining in large mining height with shallow overburden strata.The results show that when the coal is cut normally,the initial caving distance of immediate roof is 23 m,the initial caving distance of the main roof is38 m,and the periodic caving distance is 17 m.When the mining pressure of the working face is strong,the maximum working resistance of the support is about 24 000 k N,and the overburden collapse will form a rock pillar with a width of 12~20 m.The maximum resistance occurs when the key layer is unstable,and the maximum pressure occurs during the fourth and fifth periodic periods,and the stagnation of the working face leads to a significant increase in the resistance.The research provides technical reference for improving the technical level of the supporting technology of the extra-thick coal seam.