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阳泉矿务局二矿为了更多地回收煤炭资源,1980年开始用刀柱法开采巷道下煤柱,受护巷道为3号煤层中的725巷和总回风巷,所采煤层为巷道下方12号煤层中所留永久性煤柱(见图1),此试验列为验,探讨上行开采的可能性。 1980年8月设置巷道观测站,4月开始试采,1981年1月采完,10月观测结束。成功地采出煤炭13.2万吨,工作面回采率达73%。采前巷道未加固,巷道内最大下沉为0.745米,开采过程中只进行过局部维修,仍能保持正常使用。山西省1981年度科研项目。试验的主要任务为: 1、了解岩层内部的移动变形规律及刀柱法采煤对巷道的影响; 2、为今后开展巷道下采煤积累经
In order to recover more coal resources, the No. 2 Mine of Yangquan Mining Bureau began to exploit the pillars of the roadway with pillars method in 1980. The protected roadway is 725 lane and total return air lane in No. 3 seam. The coal seam is the roadway Below the No. 12 coal seam in the permanent pillars (see Figure 1), this test as a test to explore the possibility of ascending mining. August 1980 set up tunnel observation station, trial mining began in April, January 1981 mining finished, October observation ended. 132,000 tons of coal were successfully mined and the recovery rate of working face reached 73%. The roadway before mining is not reinforced, and the maximum settlement in the roadway is 0.745 meters. Only partial maintenance is carried out in the mining process, and the normal use can still be maintained. Shanxi Province in 1981 scientific research projects. The main tasks of the experiment are as follows: 1. To understand the law of movement and deformation within the strata and the influence of coal mining on the roadway by the pillar method; 2. To accumulate the accumulated coal