接地网对采空区直流电法探测的影响

The influence of grounding grid on electromagnetic detection of goaf

地下采空区的存在极易造成电力杆塔倾斜、沉降,是电网安全稳定运行的重大隐患。因此,探测输电走廊下的采空区意义重大。接地网的存在会对测量的数值产生一定的影响,导致探测结果不准确。而且在实际探测中,有些探测位置不可避免地遇到有电力杆塔的位置,而杆塔下侧埋有接地网。对接地网存在时采空区的探测进行研究,利用电磁场理论建立了数学模型,并且进行了仿真研究,通过不同探测方式下接地网对探测数据的影响分析,考察了接地网对采空区探测数据的影响规律。同时,针对影响较大的区域进行了划分,提出了合理化的建议,可以为输电走廊下的采空区探测的实际工程工作提供参考和指导。

The existence of underground goaf can easily cause tilting and settlement of power towers,which is a major hidden factor in the safe and stable operation of power grid.To detect the mine goaf under the power transmission corridor is of great significance.When there is a grounding grid in the detection area,the grounding grid will have certain influence on the measured value.In this paper,the detection of mine goaf in the presence of a grounding grid is presented.Based on the theoretical analysis,the mathematical model is built,and the simulation model is conducted.The influence of the grounding network on the detection data was analyzed through different detection methods,and the influence rule of the grounding network on the detection data of the gob area was obtained.At the same time,the areas that have large impact on the detection value were divided,and reasonable suggestions were put forward,which can provide reference and guidance for the actual engineering work of goaf detection under the transmission corridor.