煤矿冒落带地电特征研究

Study on geoelectric characteristics of coal mine caving zone

煤层顶板受采动破坏影响产生裂隙带,易引发顶板突水事故。为此,通过建立含水断层构造、工作面推进不同距离的顶板岩层破坏模型,实现了直流电法三维正反演,并在实验室中采用物理模型模拟实际探测中的地电模型。结合模拟与实验结果,对鄂尔多斯某矿工作面顶板受采动影响破坏动态监测的资料进行了处理与解释。以上数值模拟、物理实验和工程实例的结果,表明直流电阻率法能够准确地反映顶板覆岩受采动影响的电阻率变化特征及顶板所含的地质构造,确定冒落带和裂隙带的范围。

The roof of coal seam is affected by mining damage to produce fracture zone, which is easy to cause roof water inrush accidents. Therefore, the 3 D forward inversion of DC method is realized by establishing the roof rock failure model of water bearing fault structure and different distance of working face. The physical model is used in the laboratory to simulate the geoelectric model in actual detection. Combined with the results of simulation and experiment, the data of dynamic monitoring of roof failure in a working face affected by mining in Ordos is processed and interpreted. The results of the above numerical simulation, physical experiments and engineering examples show that the DC resistivity method can accurately reflect the resistivity variation characteristics of the roof overburden affected by mining and the geological structure contained in the roof, and determine the scope of the caving zone and fracture zone.