Mine Safety Technology Branch of China Coal Research Institute
China Coal Technology and Engineering Group Coal Mining Research Institute
College of Earth Sciences and Engineering, Shandong University of Science and Technology

千树塔井田由于地形起伏落差较大，地面大回线瞬变电磁法探测装置布置受限，为了查明该区域油气管道陕京二线下伏采空区分布范围，对小回线瞬变电磁法开展数值模拟和现场试验，分析其地面探测的可行性，并将优化参数应用到现场。结果表明：数值模拟确定3 m×3 m小回线瞬变电磁法可以有效探测超过200 m深度、采高超过1 m的采空区，对低阻值的充水采空区有更明显的效果；现场试验采用发射线框边长3 m×3 m、叠加次数15次、发射频率16 Hz、发射电流≥8 A等参数优化后的小回线瞬变电磁法可以达到有效探测目的，验证了数值模拟的正确性；在3号煤层共圈定解释了5个异常区，推断为采空区或烧变岩空隙，充分验证了小回线瞬变电磁法探测的可靠性。

Due to the large terrain fluctuation and drop in Qianshuta well field, the layout of the ground large loop transient electromagnetic method detection device is limited. In order to find out the distribution range of goaf under the second Shanjing line of oil and gas pipeline in this area, numerical simulation and field test of small loop transient electromagnetic method were carried out to analyze the feasibility of ground detection, and optimized parameters were applied to the field. The results show that the numerical simulation confirms that the 3 m×3 m small loop transient electromagnetic method can effectively detect the goaf with a depth of more than 200 m and a mining height of more than 1 m, and has a more obvious effect on the water-filled goaf with low resistance; the field test adopts the small loop transient electromagnetic method with optimized parameters such as the length of the transmitting wire frame 3 m×3 m, the number of stacking times of 15, the transmitting frequency of 16 Hz, and more than 8 A transmitting current, which can achieve the purpose of effective detection and verify the correctness of the numerical simulation; a total of 5 abnormal areas were delineated and explained in the No.3 coal seam, which were inferred to be gobs or burned rock voids. The reliability of the small loop transient electromagnetic detection method is fully verified.

中国煤炭科工集团有限公司科技创新创业资金专项资助项目（2019-2-ZD005）；国家自然科学基金资助项目（52104196）

牟义，张永超，邱浩，等. 复杂地形小回线瞬变电磁法探测采空区试验研究[J]. 煤矿安全，2023，54（9）：156−165

MU Yi, ZHANG Yongchao, QIU Hao, et al. Experimental study on goaf detection by small loop transient electromagnetic method in complex terrain[J]. Safety in Coal Mines, 2023, 54（9）: 156−165