直流电法超前探测沙槽模拟实验

Advance detection by direct current method

直流电法超前探测是研究掘进工作面前方地层电性变化规律,预测掘进面前方含、导水构造的分布和发育情况的一种井下电法探测新技术。本次超前探测实验是通过在沙坑中埋设已知的低阻体,在模拟巷道中布置电极的方式,采用网络并行电法勘测系统将前方已知的物体探测出来。因为资料采集不受外界电流和其他环境的影响,探测结果较为理想,可以较为清楚的反应前方的异常体,验证其电法超前探测的可行性。

Advance detection by direct current method is a new technology of downhole electric detection which is applicable for researching on variation regularity of electrical property of frontal stratum of driving working face and making prediction on distribution and development of frontal water bearing and transmit-ting structures of driving working face.This advance detection experiment is conducted in this way,firstly, to inbuilt known low resistance object in sandpit and to place electrodes in simulated roadways;secondly,to detect known frontal objects by network parallel electrical prospecting and detecting system.The results are relatively reliable because the data acquisition is invulnerable to outside electric current and other environ-ment and frontal anomaly objects are reflected clearly,thus it is verified that the advance detection by direct current method is feasible.