温纳装置探测孤石深度影响因素及其数值模拟研究

随着高密度电法温纳装置在实际工程中的广泛应用,其探测深度的研究也显得十分重要。本文在详细分析了探测深度的各种影响因素后,对温纳装置探测深度基本理论进行了深入研究,得出了温纳装置探测深度跟误差扰动、异常体半径、异常体相对电阻率和电极距四个重要因素之间的关系。研究结果表明,温纳装置的探测深度是随误差扰动的增大而减少的,是随异常体半径的增大而呈非线性增大的。相对电阻率在1附近时探测深度最小,但增大到一定程度后,探测深度基本稳定,没有大的变化。当其它因素保持不变时,探测深度是随着电极距的增大而增大,但增大到一定范围后,探测深度反而会变小。最后结合理论分析与工程实际,通过对温纳装置探测孤石深度的数值模拟,提出了增加温纳装置探测孤石深度的正确方法。

INFLUENCING FACTORS AND NUMERICAL SIMULATION OF WENNER DEVICE FOR DETECTING BOULDER DEPTH

Nowadays, the Wenner device of high-density electrical method has been used more and more widely in engineering. It is very significant to study its detecting depth of boulders in ground. This paper analyzes the factors influencing the detecting depth in detail. It studies the basic theory to the Wenner device in depth and then gets the relationship between the detecting depth and the four primary factors including agitation error, abnormal body radius, relative resistivity of abnormal body and electrode spacing. The research results show that, the detecting depth of Wenner device decreases with the increase of agitation error and increases nonlinearly with the increase of abnormal body radius. When the relative resistivity value is about one, the detecting depth is minimized. But when it increases to a certain value, the detecting depth does almost not change. When other factors are unchanged, the detecting depth increases with the increase of electrode spacing, which will reduce if the electrode spacing has exceedingly increased. Finally, by combining the theoretical analysis with field results, this paper proposes a method to improve the detecting depth of Wenner device to boulders based on the numerical simulation.