Tunnel advanced exploration method of long-electrode source direct current electric field

Abstract

A tunnel advanced exploration method of a long-electrode source direct current electric field is disclosed. In actual exploration applications, by using a traditional direct current resistivity method, an induced electric field signal is relatively weak and is easily interfered by tunnel conditions such as float coal, a metal orbit and the like. By using the method of the invention, the above problems can be solved. The method comprises the following steps of arranging a long electrode source A for providing power in a center of a tunneling heading face, and providing a large current to the ground to form a stable artificial electric field; and using a potential or a potential difference observed by a dipolar device and a tripolar device to obtain a minimum position of a curve through an apparent resistivity conversion formula, and combining an empirical formula to quantitatively explain position information of a front abnormal body in full-space formation. In the invention, a detection ability of predicting a water-bearing abnormality is increased, and an application effect of a long-electrode source resistivity method in many fields such as urban subway detection, highway tunnelmonitoring, mine disaster detection and the like can be promoted.

Description

technical field [0001] The invention relates to the technical fields of tunnel prediction and mine disaster detection, in particular to a new method for tunnel advance detection of a long electrode source DC electric field. Background technique [0002] The DC resistivity method for tunnel look-ahead is a hot topic in mining, hydrological engineering and environmental investigations. As we all know, geological disasters such as water inrush often occur in the mountainous areas of southwest China. Geological prediction before tunnel excavation is an important task for governments or enterprises to ensure construction safety. The very complex geological conditions, especially the water-bearing formations in front of the tunnel face, bring more difficulties in tunneling. At present, advanced tunnel detection methods that have been formed include DC resistivity method and seismic method. On the one hand, seismic methods are usually sensitive to fracture zones because it mainl...

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Problems solved by technology

[0004] The present invention proposes a new method for advanced detection of tunnels with long electrode source DC electric field, which can solve the problem that the traditional DC resistivity method is used in actual exploration because the induced electric field signal is relatively weak and is easily affected by tunnel conditions such as floating coal and metal rails. Interfering technical issues

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