我国不仅是主要的产煤国，同时也是受水害影响最为严重的国家之一，随着煤矿开采深度、开采强度、开采速度、开采规模的增加和扩大，以及新煤田的大面积开发，煤矿水灾害威胁愈来愈严重，对煤矿采空区的分布进行精准地球物理探测是减少煤矿水害的主要途径，CSAMT法是煤矿多层采空积水区探测的重要电磁勘探方法。为研究阳煤集团某煤矿双层采空区的电磁响应规律，基于有限元法对不同类型双层采空区的CSAMT响应进行模拟。结果显示：① 存在双层异常体时2个异常体电性同为高阻或低阻时，异常体的层间隔影响异常体的纵向分辨率，间隔较小时难以区分双层异常边界，当2个异常体间隔大于50 m时，可以区分为2个异常体的响应，异常体层间隔越大，响应越明显；② 双层采空异常体中上层为高阻、下层为低阻异常时，2层异常体间隔达到10 m时就能够区分2层异常响应，层间隔越大，分辨能力较好；③ 双层采空异常体上层为低阻，下层为高阻时，只有当2层异常体间隔达到50 m以上时，才能够区分2层异常体引起的异常，说明上层低阻体对下层异常体存在屏蔽作用；④ 最后根据正演模拟结果，选取与模型电性类似的试验区进行试验，试验结果与正演模拟响应规律基本吻合，说明正演模拟结果较为可靠。上述多层异常体的CSAMT响应规律可为不同电性条件下的双层采空区电磁法勘探的方法选择提供依据。

China is not only a major coal-producing country，but also one of the countries most seriously affected by water disasters. With the increase and expansion of coal mining depth，mining intensity，mining speed and mining scale，as well as the large-scale development of new coalfields，the threat of coal mine water disaster is becoming more and more serious. Accurate geophysical exploration of the distribution of coal mine goaf is the main way to reduce coal mine water disaster. CSAMT method is an important electromagnetic exploration method for the detection of multi-layer goaf water accumulation area in coal mines. In order to study the electromagnetic response law of double-layer goaf in a coal mine of Yang Coal Group，the CSAMT responses of different types of double-layer goaf were simulated based on finite element method. The results show that：① when there is a double-layer abnormal body，when the electrical properties of the two abnormal bodies are both high-resistance or low-resistance，the layer interval of the abnormal body affects the longitudinal resolution of the abnormal body，and when the interval is small，it is difficult to distinguish the boundary of the double-layer anomaly. When the interval between the two abnormal bodies is more than 50 m，it can be divided into the response of two abnormal bodies，the larger the interval between the abnormal bodies，the more obvious the response. ② when the upper layer of the double-layer goaf is high resistivity and the lower layer is low resistivity，the abnormal response of the two layers can be distinguished when the interval between the two layers reaches 10m. The larger the interval between the layers，the better the resolution. ③ when the upper layer of the double-layer goaf is low resistance and the lower layer is high resistance，only when the interval between the two layers is more than 50 m，can we distinguish the anomalies caused by the two layers of abnormal bodies，indicating that the upper low resistivity bodies have shielding effect on the lower abnormal bodies. ④ finally，according to the forward simulation results，the experimental area similar to the electrical property of the model is selected for the experiment，and the test results are basically consistent with the response law of the forward simulation，which shows that the forward simulation results are more reliable. The CSAMT response law of the above-mentioned multi-layer abnormal bodies can provide a basis for the selection of electromagnetic exploration methods in double-layer goaf under different electrical conditions.