为了克服电法超前地质预报中巷道内供电的诸多不便,及数据解释复杂化的问题,采用地面供电的长极距大定源建场模式,通过测量工作面附近的电位差及激发极化率异常,判定地下工程隐患是否存在.物理模拟试验表明:在迫近低阻地下工程隐患时,电位差出现明显的增大,而极化率异常出现负值,且不断减小；采用三维观测系统测量,可以实现对隐患的实时预警,通过对各个方向异常的比较分析,可以确定隐患的空间位置.这种预报方法用于地下掘进工程隐患超前预报,对工作面前方或附近异常体有一定的分辨能力.%In order to overcome the inconvenient power supply in the mine roadway during the electric advance geological prediction and the complicated problems of the data explanation, a long pole span fixed power site building mode with a power supply from the surface ground was provided.With the measurement of the potential difference near the coal mining face and the abnormal of excitation polarization, hidden dangers were judged. The physical simulation experiments showed that when the low resistances sphere hidden danger was reached closely, the potential difference would be increased obviously, abnormal of the polarization rate would be a negative value and would be reduced continuously.The 3D observation system measurement was applied to realize the real time early warning of the hidden danger. With the comparison analysis on the abnormal in each direction, the space location of the hidden danger could be determined. The prediction method applied to the advance prediction of the hidden danger in the underground excavation project could have a certain distinguishing ability of the abnormal mass in front or near the working face.
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