Composite induced polarization instrument for advanced geological prediction of tunnel or gallery

Abstract

The invention relates to a composite induced polarization instrument for the advanced geological prediction of a tunnel or gallery. The composite induced polarization instrument structurally comprises a transmitter and a receiver. The transmitter comprises a transmission singlechip system, a double-exciting current module, a multi-frequency signal waveform synthesis module, a power drive module, a double-frequency bridge inverter, a constant current inversion oscillator, an overvoltage overcurrent protection module and the like. The receiver comprises a receiving singlechip system, an input protection module, a ground compensation module, a power frequency signal suppression and noise processing module, a differential input amplification module, an industrial personal computer and the like, wherein the industrial personal computer finishes operating a hardware circuit and processing time-domain and frequency-domain signals. The composite induced polarization instrument can finish measuring parameters such as apparent resistivity, ground resistance, apparent polarizability, half-life, excitation ratio, apparent frequency dispersibility and the like, realizes multifunction saves instrument cost, effectively weakens field working strength, and can realize rock integrity detection and particularly solve the problems of three-dimensional water body positioning and water volume prediction.

Description

technical field [0001] The invention relates to an advanced geological prediction system based on induced polarization method in a tunnel or tunnel, in particular to a composite induced polarization instrument and equipment for advanced geological prediction of a tunnel or tunnel. Background technique [0002] Tunnel engineering geological disasters are the key factors restricting tunnel construction. Often due to the unknown geological conditions ahead of tunnel excavation, unpredictable geological disasters often occur, such as water inrush, mud inrush, collapse, etc., which bring serious safety problems to tunnel construction. and significant economic losses. In the process of underground coal mining, geological disasters such as water inrush in roadways are often encountered, resulting in the depletion of water sources in the mining area and the destruction of water and ecological environment. Therefore, water inrush and permeation accidents in tunnels or tunnels have b...

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Problems solved by technology

[0007] For the research and development of combined induced polarization instruments for tunnels or tunnels, the main problems are as follows: ①In the geological prediction work of tunnels or tunnels, the frequency-domain induced polarization instruments and time-domain induced polarization instruments are not integrated, and they are detected separately, resulting in low work efficiency. Low, high equipment cost; ②At present, there is no induced polarization equipment that can realize the water volume prediction and three-dimensional imaging of the tunnel water body, and the large current pulsating constant current power supply technology needs to be solved; ③The anti-interference technology and device suitable for the working environment of tunnels or tunnels unresolved

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