超宽工作面的构建有助于推动煤炭资源的安全、高效开采。然而,受巷道空间、施工条件的限制,常规矿井地球物理的探测深度有限,无法准确获取超宽工作面内部及顶底板一定范围内的地质信息。为了提高超宽工作面底板富水区的探测精度,给实测数据处理及解释提供依据,在总结分析当前矿井地球物理探测技术的基础上,针对可应用于超宽工作面探测的三维直流电阻率法,结合河南永城某煤矿21106工作面底板灰岩水的赋存特征,采用理论分析、数值模拟和实测数据相结合的研究方法,系统研究了三维观测和二维观测模式的数据特征和分辨能力。研究结果表明:相较于传统的同侧发射接收二维观测模式,对侧发射接收的三维观测模式对工作面底板低阻体的反应更为灵敏;对侧发射接收三维观测模式所得数据,经过常规视电阻率公式计算后,视电阻率与实际电性有时相反,因此需要采用三维反演方式进行数据处理;对河南永城某煤矿21106工作面观测到的三维模式数据进行了三维反演处理,经井下钻探资料验证了三维观测结果的可靠性。研究结果为二极装置条件的二维观测和三维观测数据解释提供了依据。

The construction of ultra-wide working face is helpful to promote the safe and efficient mining of coal resources. However,due to the limitation of roadway space and construction conditions,the de- tection depth of conventional mine geophysics is limited,and the geological information inside the ultra- wide working face and within a certain range of roof and floor cannot be accurately obtained. In order to improve the detection accuracy of the water rich area on the bottom plate of the ultrawide working face and provide a basis for the processing and interpretation of measured data,based on the summary and a- OF MINING SCIENCE AND TECHNOLOGY nalysis of current mine geophysical detection technology, the three-dimensional ( 3D) DC resistivity method that can be applied to the detection of the ultrawide working face,combined with the occurrence characteristics of limestone water on the bottom plate of the working face in a coal mine in Yongcheng,Henan,was systematically studied using a combination of theoretical analysis,numerical simulation,and measured data to study the data characteristics and resolution ability of 3D observation and 2D observation modes. The research results show that:Compared with the traditional two-dimen- sional observation mode of the same side transmitter-receiver,the three-dimensional observation mode of the opposite side transmitter-receiver is more sensitive to the low resistance body on the floor of the min- ing face. The data obtained by the three-dimensional observation mode of the opposite side transmitter- receiver are calculated by the conventional apparent resistivity formula,the obtained apparent resistivity is sometimes opposite to the actual electrical property,so it is necessary to use the three-dimensional in- version method for data processing. Finally,the 3D model data observed during the work in a coal mine in Yongcheng,Henan Province was subjected to 3D inversion processing,and the reliability of the 3D inversion results was verified through underground drilling data. The research results provide a theoretical basis for the two-dimensional observation and three-dimensional observation data interpreta- tion of the pole-pole device conditions.