中文摘要：

本文在简要介绍坑道超前聚焦探测原理的基础上,对坑道直流电阻率超前聚焦探测的影响因素及最佳观测方式进行了研究.通过有限元法对不同尺度的坑道、不同距离的旁侧异常体以及不同观测方式等条件下的地电模型进行了模拟计算.结果表明：旁侧异常体距离坑道越近,对异常曲线影响越大;坑道大小对超前聚焦的影响可忽略.在压制旁侧干扰方面A-M-A0装置要优于A-M装置,实际工作中应尽量增大供电电极距A0A,并使测量极距A0M与供电极距A0A满足A0M/A0A=0.6关系时,可达到最佳探测效果.

英文摘要：

The influential factors and optimum survey method of the tunnel for DC resistivity advanced focus detection are studied on the basis of introducing the principle of advanced focus detection brifly. We simulate the geoelectric model on conditions of different sizes of the tunnel, different positions of the side anomalous body, as well as two kinds of methods of focusing observation by the finite element method . The results show that the more the side anomalous body close the tunnel, the greater influence of abnormal curve. The effect of size of the tunnel on advanced focusing can be ignored. The A-M-A0 array is superior to the A-M array in suppressing side disturbance. It can reach the best detect effect when the transmitting electrode spacing A0 A is increased as much as possible in practical work, and the ratio of surveying electrode spacing Ao M to supply electrode interval A0 A is AOM/AOA=0.6.