1. School of Resource and Geosciences,China University of Mining and Technology,Xuzhou　 221116,China;2. No. 5 Geological Exploration Institute of Hei-longjiang Province,Heilongjiang Bureau of Geology and Mineral Resources,Harbin　 150036,China

针对目前直流电阻率法在巷道及工作面周围隐蔽致灾源精细探测方面不足这一现状,结合地面和矿井直流电法工作特点,提出在地面布设场源,巷道内进行接收的地面—巷道直流电阻率法探测技术。在对地面—巷道直流电阻率法基本原理和观测系统设计原则介绍的基础上,分析了偶极源电场及不同深度归一化电位差曲线分布特征。根据煤系地层典型地质构造地电特征建立数值模型,计算结果表明:地面—巷道相比于地面和矿井直流电阻率法具有更高的探测精度,且以对低阻异常体探测效果最为明显;提出采用调节偶极距观测异常幅值变化规律快速确定隐蔽致灾源空间位置的方法。实际应用效果表明,地面—巷道直流电阻率法可有效解决巷道及工作面周围隐蔽致灾源全方位探测难题,指出其场源与观测系统相分离的布测方式在矿井、交通、水利等工程地质灾害预测、预报方面应用前景广阔。

In terms of the deficiency of DC resistivity method regarding the detailed detection of hidden disaster sources in and around roadway and coal face,the authors combined the working characteristics of surface and mine DC resistiv- ity method and proposed a detection technology of Ground-Roadway DC resistivity method that the field source laid on ground and the receiving system on roadway. Based on the introduction of the basic principle of Ground-Roadway DC resistivity method and the principles of observing system design,the paper analyzed the distribution characteristics of the dipole source electric field and the normalized potential difference curves in different depths. The numerical model was established based on the geoelectric characteristics of geological structure in coal measure strata. The results show that the Ground-Roadway DC resistivity method has a higher detection accuracy in comparison with the ground and mine DC resistivity method,and the low resistivity anomalies has the most obvious prospecting effect;the method to quickly determine the spatial location of hidden disaster source was proposed by regulating dipole moment observing abnormal amplitude variation. Practical application demonstrates that the problem of omnidirectional detection for hid- den disaster sources around roadway and working face is solved effectively with Ground-Roadway DC resistivity meth- od;and the layout which separated the field source and the observation system has a widely application prospect in forecasting geological disasters in mine,traffic,water conservancy and other projects.

国家重点基础研究发展计划(973)资助项目(2013CB227900)；

Liu Shucai,Chen Shuangshuang,Xu Ke. Detection technology of Ground-Roadway DC resistivity method[J]. Journal of China Coal Socie- ty,2017,42(2):360-366.