以义煤千秋矿21121工作面为工程背景,通过相似模拟比较和现场测试的方法对特厚煤层回采工作面前方煤体破碎规律进行综合研究。结果表明:特厚煤层距离回采工作面前方同一位置,层位由低到高破碎程度依次增加;同一层位,距离工作面愈近破坏愈严重,距离增加破坏减弱;同一地质条件下,随着煤体厚度的增加,工作面前方的煤体可以形成倒三角充分破碎层、正三角不充分破碎层;特厚煤层开采下部煤体超前支承压力极值点距工作面相对较近,且支承压力极值小于上部煤体;煤体厚度增加,距离底板同一高度,超前支承压力极值逐渐减小;同时,超前支承压力对工作面前方煤体的整体破煤率减小。 Based on the engineering background of 21121 working face of Yiqiuqianqiu Mine, the law of coal mass breakage in front of working face in special thick seam was comprehensively studied by means of similar simulation and field test. The results show that the thickness of coal seam increases from low to high in the same position in front of the working face; in the same layer, the more serious the damage is from the working face, the more the distance is increased and the more damage is weakened. With the same geological conditions, The thickness of coal body increases, the coal body in front of the working face can form a fully crushed layer in the inverted triangle and the triangle is not fully crushed. The extreme pressure point of advanced support coal under the coal mining in the thick coal seam is relatively close to the working face, and the supporting pressure The maximum value is smaller than that of the upper coal body; the thickness of the coal body increases, and the extreme value of the advance support pressure decreases from the same height of the soleplate; meanwhile, the overall coal breaking rate in front of the working face decreases with the advance support pressure.