3D finite element numerical simulation of advanced detection in roadway for DC focus method

巷道聚焦电流法超前探测的三维有限元数值模拟(英文)

Within the roadway advanced detection methods, DC resistivity method has an extensive application because of its simple principle and operation. Numerical simulation of the effect of focusing current on advanced detection was carried out using a three-dimensional finite element method （FEM）, meanwhile the electric-field distribution of the point source and nine-point power source were calculated and analyzed with the same electric charges. The results show that the nine-point power source array has a very good ability to focus, and the DC focus method can be used to predict the aquifer abnormality body precisely. By comparing the FEM modelling results with physical simulation results from soil sink, it is shown that the accuracy of forward simulation meets the requirement and the artificial disturbance from roadway has no impact on the DC focus method.

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。