煤层工作面内陷落柱综合物探探查

Application of Integrated Geophysical Prospecting on Subsidence Column Detection within Coalfaces

煤层工作面内陷落柱与煤层之间具有显著的电阻率、波速和密度差异,适宜于采用无线电波透视法和震波透视CT法来探测煤层工作面内陷落柱的边界范围;陷落柱体通常裂隙发育,与围岩相比较,其富水陷落柱为相对低电阻率值范围,而不富水陷落柱则为相对高电阻率值范围,因此,可利用煤层底板三维电法来探查底板陷落柱富水性。谢桥矿13218工作面1#陷落柱的探测表明,该陷落柱范围具有较高的电磁波吸收系数特征和相对较高的纵波波速特征;工作面底板陷落柱向下范围为相对高电阻率值特征,为不富水陷落柱。该综合物探探测结果与实际验证资料基本吻合,有效地指导了本煤层工作面开采及底板煤层工作面的开采设计与施工。

Between coalface subsidence column and coal seams have provided with distinct resistivity, wave velocity and density differ- ences, thus suitable for radio-wave penetration method and seismic wave CT method to detect subsidence column limits within coalface. Commonly, fissures are well developed in subsidence columns; compared with surrounding rocks, water rich columns have relatively low resistivity, while columns without water relatively high. Thus, the 3D electric method can be used to detect coal floor floor subsidence column water yield property. The detection of No. 1 subsidence column in the Xieqiao coalmine No. 13218 coalface has shown that within the column limits has higher electromagnetic wave absorption coefficient and relatively high compression wave velocity. Coalface floor subsidence column downward has relatively high resistivity, thus a column without rich water. The results of integrated geophysical pros- pecting are basically accord with practical validated data, effectively guided the coalface winning and coalface design and operation.