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在巷道超前探测的方法中,电阻率法由于原理简单、操作方便,有着很好的应用前景。运用三维有限元法对聚焦电流法的超前预报效果进行数值模拟,计算和分析点电源和九点式电源在供相同电流的情况下电场的分布情况。结果表明:九点式布极方式有很好的聚焦能力,聚焦电流法能准确地发现掘进面前方含水异常体。将数值模拟和物理土槽试验进行对比,正演模拟精度符合要求,巷道中的人为干扰对聚焦电流法超前探测没有影响。
In the method of advanced detection in the roadway, the resistivity method has a good application prospect because of its simple principle and convenient operation. The three-dimensional finite element method is used to simulate the advance prediction of the focusing current method, and the distribution of the electric field under the same current of the point source and nine-point source is calculated and analyzed. The results show that the nine-point cloth layout has a good focusing ability, and the focused current method can accurately find the abnormal water body in front of the heading face. Comparing the numerical simulation with the physical soil tank test, the forward simulation accuracy meets the requirements. The artificial interference in the roadway has no influence on the advance detection of the focused current method.