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采用统计原理确定神东矿区采高与工作面初次来压步距及周期来压步距数据的分布状态,并运用岩石力学、矿压理论就采高增加与工作面来压步距的关系进行了深入研究。结果表明:采高与平均初次来压步距呈指数函数关系,与平均周期来压步距呈二项式函数关系。总体来说,采高增加,平均初次来压步距呈同步增加趋势。采高增加,引起普通采高条件下的基本顶岩层转化为直接顶岩层。采场基本顶岩性和裂隙发育程度与工作面来压步距紧密相关,会引起来压步距的增减。神东矿区2,5,6,7号煤组采场工作面来压步距较1,3,4号煤组相对较长。冒落矸石对采空区充填程度高,初次来压步距增大,但对周期来压步距影响有限。将工作面采高增加对来压步距的影响规律应用到神东矿区末采贯通实践中,指导了补连塔矿22306工作面末采贯通。
The statistic principle was used to determine the distribution of initial step-pressure and period-to-step stride distance between mining height and working face in Shendong Mining Area. The relationship between mining height and pressure step on working face was determined by using rock mechanics and rock pressure theory In-depth study. The results show that there is an exponential function between the height of mining and the average initial pressure step and a binomial function relationship with the pressure step of average period. In general, mining height increased, the average pressure step to the first time showed a synchronous increase trend. The increase of mining height caused the conversion of the basic top rock formations under normal mining conditions to the direct top rock formations. The basic roof lithology and the degree of fracture development in the stope are closely related to the pressure step on the working face, which can cause the increase or decrease of the pressure step. No.2, No.6, No.6, No.7 coal stope in Shendong Mining Area has a longer pressure step than the No.1, No.3 and No.4 coal groups. Take off the gangue gangue filling area to a high degree, the pressure step for the first time to increase, but the cycle to pressure step has a limited impact. The effect of increasing the working face mining height on the pressure step spacing was applied to the practice of mining at the end of Shendong Mining Area to guide the mining of 22306 working face of BuLianTa Mine.