A seismic wave advance prediction and detection method for water-bearing geological structures in tunnels

Abstract

The invention discloses a seismic wave advance prediction and detection method for a water-bearing geological structure in a tunnel, which includes exciting a seismic wave source, collecting a seismic wave reflection signal reflected from an interface where the seismic wave encounters an elastic wave impedance difference; and performing spectrum analysis on the seismic wave reflection signal to obtain Seismic wave field parameters, the seismic wave field parameters include the echo time, echo waveform and echo intensity of the seismic wave reflection signal; the seismic wave field parameters are substituted into the elastic medium calculation formula for mechanical analysis, and the seismic wave and surrounding rock stress gradients are established. The relationship between seismic waves and liquid seepage velocity can be used to determine the location and distribution of water-bearing geological structures. The invention can accurately predict the position and scale of the water-bearing geological structure in front of the face, overcomes the defect that the traditional TSP technology cannot accurately predict the water-bearing geological structure, and greatly improves the accuracy and reliability of the advance forecast.

Description

technical field [0001] The invention relates to the technical field of geological detection, in particular to a seismic wave advance prediction and detection method for a tunnel water-bearing geological structure. Background technique [0002] The sudden water gushing disaster during the construction of the new tunnel has brought huge economic losses, heavy casualties and bad social impact to the construction, and caused irreparable damage to the water resources and ecological environment of the surface and the tunnel site. The theory and technology of advance detection of water inrush disaster sources (water-bearing geological structures) has always been a key scientific problem to be solved urgently in the construction of tunnels and other underground projects. At present, geological, drilling, geophysical and other methods are mainly used to predict the location and scale of water-bearing geological structures that may exist in front of the construction face, combined wit...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for advanced seismic wave prediction and detection of water-bearing geological structures in tunnels, which can accurately grasp the location and scale of water-bearing geological structures in front of the tunnel face, and overcome the traditional TSP technology It is impossible to accurately predict the defects of water-bearing geological structures, which greatly improves the accuracy and reliability of advanced forecasting

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