Tunnel construction advanced geological detection system and method

Abstract

The invention relates to a tunnel construction advanced geological detection system and method. Through the induced polarization geophysical exploration method, advanced prediction and identificationof fault fractured zones and karst caves in front of a tunnel face including water-conducting structures are performed, through setting multiple sets of detection electrodes, the position of the water-containing structure can be further determined when the water-containing structure exists in front of the tunnel face, the important reference is provided for advanced geological prediction in the tunnel construction process, and tunnel construction safety is guaranteed.

Description

technical field [0001] The invention relates to a geological detection system, in particular to an advanced geological detection system and a detection method for detecting water content ahead during tunnel construction. Background technique [0002] With the rapid development of domestic highways, railways, water conservancy, mines and other engineering constructions, a large number of tunnel projects have also appeared. Before the tunnel construction, due to the complex terrain, large tunnel burial depth, and limited surface survey technology, it was not possible to find out all the unfavorable geological conditions along the line during the geological survey stage, and the advanced forecast method during the construction period failed to make effective forecasts for water-bearing structures. During tunnel construction, natural disasters such as landslides and water gushing often occur due to geological problems. Therefore, it is an urgent need to ensure the safety of tun...

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Problems solved by technology

In the prior art, when the excitation polarization method is used for advanced detection, the power supply positive electrode is usually set on the tunneling machine, the measurement electrode is set on the side wall of the tunnel, and the power supply negative electrode is set at infinity behind the tunnel. The excitation current is from The front of the power supply positive electrode flows to the power supply negative electrode. Due to the extremely complex electromagnetic environment of the excavation machine itself, it will generate electromagnetic interference and affect the detection results; at the same time, as the excavation machine advances, the distance between the measurement electrode and the power supply electrode changes. The resulting changes in resistivity and polarizability will interfere with changes in resistivity and polarizability due to changes in the geological environment

[0005] In order to solve the above problems, the previous application proposed an advanced geological detection system for tunnel construction. By setting the measurement electrode and the power supply negative electrode, the distance between the measurement electrode and the power supply electrode is kept constant, thereby avoiding the influence of distance changes, but It can only qualitatively determine whether there is a water-bearing structure in front of the tunnel face through the apparent resistivity and apparent polarizability, but cannot determine the location of the water-bearing structure

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