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目前,我国煤矿的沿空留巷技术基本是在一次采全高的薄及中厚煤层中应用,厚煤层分层开采的沿空留巷技术还处在试验摸索阶段。因而,为改变我矿厚煤层沿空留巷时巷道支架破坏严重、支架回收率低等问题,1986年9月25日至12月10日对我矿平均厚度为6米的主采戊组煤层的戊_(8～10)21051面风巷沿空留巷作了巷旁砌轻型可缩性砌块的可行性探讨。 一、采煤概况 戊_(8～10)21051采面相对位置见图1。该采面回采的是戊_8、戊_9、戊_(10)合层煤的上分层(分上、下二层开采),煤层厚6.3米,煤层倾角7°,煤层平均埋深为500米;其中戊_8、戊_(10)煤层较硬,戊_9煤层呈粉末状较软;该采面老顶为中粗粒石英砂岩;直接顶中切眼以东为灰色页岩,中切眼以西为中细粒砂岩。
At present, the technology of gob-side entry retaining in coal mines is basically applied in the thin and medium-thick coal seams with full-height mining. The technology of gob-side entry retaining in thick seam mining is still in the exploratory stage. Therefore, in order to change the problem of serious damage to the tunnel support and the low recovery rate of the support when the gob-side entry retaining roadway is left in the mine, from September 25 to December 10, 1986, the coal seam of the main coal mine with an average thickness of 6 meters (8 ~ 10) 21051 Face air lane for gob-side entry for the feasibility of building lightweight and lightweight blocks. First, the general situation of coal E _ (8 ~ 10) 21051 mining face relative position shown in Figure 1. The mining face is the upper strata (sub-upper and lower strata mined) of penta_8, pe_9 and penta_ (10) coal seam, the seam thickness is 6.3 meters, coal seam dip angle is 7 °, and the average depth of coal seam Is 500 meters; Among them, E_8, E_ (10) seam is harder, E_9 coal seam is powdery soft; the mining face is topped by medium-coarse quartz sandstone; Rock, west of the cut in the fine sandstone.