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覆岩中断层的存在提高了导水裂隙带的发育高度,因此采用间歇式采煤实现保水采煤时,覆岩中存在断层时工作面的推进距离要小于无断层时的情况.在以前研究的覆岩中无断层时不同覆岩厚度保水采煤工作面合理推进距离的基础上,应用相似模拟实验和数值模拟方法,研究浅埋煤层覆岩中存在断层时,应用间歇式保水采煤不同覆岩厚度的工作面合理推进距离,回归出了导水裂隙带高度随工作面推进距离而变化的经验公式,而且得出从断层上盘向下盘推进时工作面的合理推进距离小于反向推进时的结论,为陕北浅埋煤层保水采煤的实现提供技术支持.图8,表4,参9.
The existence of faults in overlying strata improves the developmental height of water-conducting fractured zone, so when coal mining is carried out by intermittent coal mining, the propulsion distance of working face when strata are overburden is smaller than that of no fault.In the previous research Based on the reasonable advancing distance of water-retaining and coal-mining face with different overburden thickness when there is no fault in the overlying strata, applying similar simulation experiments and numerical simulation methods to study the effect of intermittent water-holding coal mining The reasonable advancing distance of the working face with overburden rock thickness regresses the empirical formula that the height of the water guiding fractured zone varies with the advancing distance of the working face and the reasonable propulsion distance of the working face from the upper plate to the lower plate is smaller than the reverse Promote the conclusion, to provide technical support for the realization of shallow water coal mining in northern Shaanxi Figure 8, Table 4, reference 9.