以峰峰集团山西大远煤业1201急倾斜工作面为背景,系统研究了急倾斜厚煤层走向长壁综放开采的基本问题,指出支架的合理设计是该类煤层成功开采的首要条件,支架设计要充分考虑急倾斜厚煤层综放开采的顶板活动规律,以工作面上部顶板的冲击载荷确定支架的工作阻力。同时急倾斜支架要有足够的抗侧向挤压能力,结合工作面采放工艺确定侧护板的抗挤压能力。急倾斜厚煤层综放开采的顶煤放出体与煤岩分界面具有明显的不对称性。结合顶煤放出规律、支架稳定性等综合确定采放工艺,提出"下行动态分段、段内上行放煤"的采放工艺,适用于急倾斜厚煤层走向长壁综放开采,可最大限度地减少采放过程中对支架的不利影响,并可获得较高的顶煤采出率。工作面安装前需对软弱底板进行加固。

Taking the extremely inclined panel No. 1201 in Dayuan coal mine, Fengfeng group, as the engineering background,the basic problems of the longwall top-coal caving mining technique in extremely inclined and soft thick coal seam were systematically studied. The results reveal that the rational design of shield supports is the first necessity for the successful extraction of coal seams in such conditions. And the roof strata movement law needs to be taken into consideration during shield design. The support capacity is determined by the impact load of the roof strata in the up- per part of working face. Meanwhile,the shield supports used in extremely inclined coal seam require enough resist- ance capacity to bear the lateral compression,which should be determined combining the mining method and top-coal drawing processes. The results also show an obvious asymmetry of the drawing body and the boundary of top-coal in ex- tremely inclined seam. The method of drawing downward segment by segment while drawing upward in each segment was proposed,considering both drawing mechanism of top-coal and the stability of shied supports. By adopting such drawing method in longwall top-coal caving mining in extremely inclined thick coal seam,the negative effects on the supports during the drawing process can be minimized and a relatively high recovery ratio of top-coal can be obtained.To ensure the stability of set-up room,the opening floor was reinforced before the face installation.