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利用井下钻孔电阻率法可以动态获得煤层采动过程中上覆岩层变形与破坏发育规律,根据采动进度测取不同时期岩层电场变化特征,可对岩层变形与破坏规律进行全面的分析研究。受现场测试条件所限,顶板单一钻孔所测得的数据具有全空间效应,因此,对岩层破坏定位存在一定的影响,从而降低了对覆岩破坏发育规律的认识能力。通过模型试验及现场测试效果对比,改进单孔电阻率测试方法,采用孔-巷间电阻率CT测试系统,进一步提升了原单一钻孔电法系统数据采集约束性,为电阻率分布反演及“两带”高度判定奠定基础。实际应用结果表明,孔巷电阻率CT测试图像清楚,对岩层受采动影响的破坏特征反应灵敏,提升了对岩层变形与破坏发育的解释能力。
The downhole borehole resistivity method can be used to obtain the deformation and failure of overburden strata during the coal mining process dynamically. According to the mining progress, the electric field characteristics of rock strata during different periods can be measured, and the deformation and failure rules of the strata can be analyzed comprehensively. Due to the limited field test conditions, the data measured by the single hole in the roof has the full space effect, so it has certain influence on the rock failure location and positioning, thus reducing the cognitive ability of overburden rock damage and development. Through the comparison between the model test and field test results, the single hole resistivity test method is improved and the hole-to-lane resistivity CT test system is adopted to further enhance the system data acquisition restraint of the single single hole drilling method and to retrieve the resistivity distribution and “Two Belt ” a high degree of determination to lay the foundation. The practical application shows that the resistivity CT images of hole and tunnel are clear and sensitive to the damage characteristics of rock strata influenced by mining, which enhances the ability to explain the deformation and failure of rock strata.