相对固定位置采动煤层底板应变的解析法及其应用

在分析矿山压力的基础上,建立了煤层底板应力分析的计算模型,并运用弹性力学理论对煤层底板下相对固定位置剖面应变分布规律进行了初步探讨。结合实际资料,对软岩底板和硬岩底板2种情况进行分析研究。随着工作面的推进,煤层某相对固定位置剖面底板应变沿深度变化幅度越来越小,但在底板浅部均出现了一定程度的拉应变,并且软岩的变化幅度远比硬岩大。这可为煤层回采巷道发生底鼓的原因提供部分力学参考依据。

Analytical Method for Strain on Extracting Seam Floor at Relatively Fixed Position and Its Application

In this paper, a computation model was established for analyzing strain on seam floor on the analysis basis of strata pressure, the distribution regularity of strain at the relatively fixed position on the seam floor was preliminarily discussed by using elastic-mechanical theory. Both the soft and hard floor rock mass was respectively analyzed according to the actual data With the face advance, the variation of strain with depth at the relatively fixed position on the seam floor became smaller and smaller, but the tensile strain appeared at the shallow part of floor to some extent, and the variation of strain in soft rock mass is much larger than that in hard rock mass. This can provide partial mechanical basis for studying floor heave in mining roadway.