Method and system for three-dimensional detection on earth electrode field and surrounding soil resistivity

Abstract

The invention relates to a method and a system for three-dimensional detection on an earth electrode field and surrounding soil resistivity. The method comprises the following steps of (1) combining an AMT (audio magnetotelluric) method and an MT (magnetotelluric) method to arrange measuring points in and around the initial range of the earth electrode field; (2) using a high-precision measuring instrument to measure the earth coordinate and elevation of each arranged measuring point, so as to obtain the coordinate data of each measuring point; (3) using an MT instrument system to collect field data of each measuring point according to the requirements of MT and AMT technical specifications, so as to obtain time sequence data of each measuring point; (4) according to the collected coordinate data and time sequence data of each measuring point at field, performing data processing and three-dimensional inversion, so as to obtain the three-dimensional resistivity structure meeting the actual underground geology conditions. The method can be widely applied to the selection of the earth electrode field and the detection of the soil resistivity.

Description

technical field [0001] The invention relates to a soil resistivity detection method and system, in particular to a three-dimensional detection method and system for grounding pole sites and surrounding soil resistivity under complex conditions. Background technique [0002] At present, the high-voltage direct current transmission system that has been put into operation basically adopts two-terminal direct current transmission system. The function of providing the earth return path for the current is an important part of the DC transmission system. Among them, the selection of the ground electrode site is one of the most important links in the entire ground electrode design process. [0003] According to the engineering experience at home and abroad, the ground pole site of HVDC transmission system should be a wide and well-conductive earth diffuse area, especially near the pole site, the soil resistivity should be below 100Ω·m, and the soil should have enough moisture, and...

AI Technical Summary

Problems solved by technology

Due to the assumption of layered media, the limited data involved in the fitting, and the strong multi-solution nature of the inversion, it is difficult to evaluate the reliability of the soil resistivity model corrected by the potential fitting method.

[0022] The above analysis shows that from the perspective of practicability and effectiveness, the existing soil resistivity measurement methods still need to be optimized and developed to meet the requirements of soil resistivity measurement under complex conditions.

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