大埋深煤层底板破坏深度统计公式及适用性分析

Applicability Analysis on Statistical Formula for Failure Depth of Coal Seam Floor in Deep Mine

针对当前工作面底板破坏深度的统计公式未能充分反映大埋深、不同采高影响下煤层开采后的底板破坏深度的情况,为了准确计算底板破坏深度,保证工作面安全生产以及制定防治水措施,须建立相应的底板破坏深度统计公式。通过现场实测和文献资料收集,分析了21个埋深大于400 m的底板破坏深度的实测结果,采用统计方法进行回归分析获得了大埋深条件底板破坏深度的统计公式,进而对公式进行了适用性分析。依据实测结果,分别对断层、一次大采高和特厚煤层分层开采的影响进行了分析,并对公式分别进行了相应修正。研究结果对于大埋深底板承压水体上采煤工作面的安全生产以及制定防治水措施具有实用价值。

The statistical formula of the current failure depth of coal seam floor can＇t fully reflect the floor failure depth under the influence of great mining depth and different mining heights.In ord to calculate the failure depth of the coal seam floor more accurately,and guide the productieron safety and take waterproof measures, it is necessary to establish the floor failure depth statistical formula.In this paper, by making situ test and analyzing references,the authors collected 21 measured data of the floor-broken depth below depth over 400 m.By re- gression analysis of the data, the statistical formula of floor failure depth in great buried condition were found and then were analyzed in terms of applicability. Additionally, on the basis of the measured results, the influence of faults, large mining height and slice mining in extra -thick coal seams were analyzed and the statistical formula were revised. Research results for the mining face above Bearing water had practical value on achieving production safety and formulating the water control measures.It also has academic significance on coal mining above water body.