Induced polarization time domain receiver equipment for advance geologic prediction for tunnel or underground tunnel

Abstract

The invention relates to induced polarization time domain receiver equipment for advance geologic prediction for a tunnel or underground tunnel. The invention improves the performance of the induced polarization time domain receiver equipment, has stronger anti-jamming capability, better adapts to the detection of the tunnel and improves the accuracy for the advance geologic prediction for the tunnel. The induced polarization time domain receiver equipment comprises a detected signal input terminal, an anti-jamming and wave trap circuit, a variable gain differential input amplifier, a wave trapping low-pass filter circuit, a second-stage gain amplifier, a polarity discriminant and signal polarity overturning circuit, a photoelectric isolation circuit, a CPU and an industrial PC; meanwhile, the photoelectric isolation circuit also controls the variable gain differential input amplifier through a first-stage gain controller and controls the second-stage gain amplifier through a second-stage gain controller; and the CPU receives stop pulses from transmitting equipment.

Description

technical field [0001] The invention relates to a time-domain advanced prediction technology based on induced polarization in a tunnel or tunnel, in particular to a tunnel or tunnel advanced geological prediction excited polarization time-domain receiver device. Background technique [0002] There are a large number of tunnel projects in the fields of water conservancy, hydropower and transportation in my country. Geological hazards in tunnel engineering 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, and collapse. Wait. In the process of underground coal mining, geological disasters such as Laokongshui are often encountered. The consequences of these geological disasters range from washing away machines and tools, flooding tunnels, and interrupting normal construction; Huge economic losses, and even some undergroun...

AI Technical Summary

Problems solved by technology

Although the application of induced polarization on the ground is relatively mature, the application in underground tunnels or tunnels is generally only a preliminary attempt. Because the detection environment of the tunnel and the ground is different, the ground detection is basically a half-space This is beneficial to the processing and interpretation of induced polarization; while the detection in most tunnels is equivalent to a nearly full-space interpretation problem, which increases the multi-solution of induced polarization, which is not conducive to various Abnormal judgment; in addition, because the secondary field signal that stimulates the polarization is very weak and susceptible to interference, the measurement accuracy is affected, and various processing needs to be done, but the final interpretation result will be greatly affected

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