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利用CMOSOL Multiphysics软件,正演分析了3层模型近场效应下二极装置电位分布特征.采用电位AM二极观测系统,设计不同的RAM供电电极距,RBN无穷远电极距,利用WDJD-4型激电仪进行野外现场试验.数值模拟表明供电电极距对2个异性点电源场影响较大,但在一定的无穷远极距范围内畸变可以矫正.现场电测深试验表明,小供电电极距RAM情况下,二极测深曲线不能正确反映电介质的电性分布.电位观测系统的无穷远极距RBN使得测深曲线偏离了正常测深曲线,甚至产生了歧义的负电阻率拐点.通过传统电场理论分析,利用不同观测装置下的视电阻率计算公式推导了二极装置非无穷远条件下的校正公式.测深数据校正误差表明,在无穷远极距满足1.5RAO≤RBO≤5RAO(RAO为供电电极A距中点O的距离,RBO为供电电极B距中点O的距离)的情况下,校正误差小于5%,可利用的无穷远电极极距提高3倍,并成功应用于井下工作面实际探测中.
Using CMOSOL Multiphysics software, the potential distribution characteristics of the bipolar device under the near-field effect of the 3-layer model were analyzed in forward modeling.Different RAM power supply electrode distance and RBN infinity electrode distance were designed by the potential AM bipolar observation system. By using WDJD-4 The field experiment was carried out by using an electromechanical instrument.The numerical simulation showed that the power supply electrode distance had a great influence on the two power supply fields with the same polarity but could be corrected within a certain infinity distance range.The field sounding test showed that the small power supply electrode distance RAM, the dipole sounding curve can not correctly reflect the electrical distribution of the dielectric.The infinite far-pole RBN of the potential observing system makes the sounding curve deviate from the normal sounding curve and even produces the ambiguous negative resistivity inflection point.Through the traditional Electric field theory analysis, using the apparent resistivity calculation formula under different observing devices, deduces the correction formula under the condition of non-infinity of two-pole device.The correction error of sounding data shows that at the infinite pole distance satisfies 1.5RAO≤RBO≤5RAO (RAO Is the distance of the power supply electrode A from the midpoint O, and RBO is the distance of the power supply electrode B from the midpoint O), the correction error is less than 5%, and the available electrode pitch of the infinite electrode is increased by 3 times Applied to the actual detection in underground face.