Three-dimensional three-component advanced refined geological prediction method

Abstract

The invention discloses a three-dimensional three-component advanced refined geological prediction method. The invention belongs to the technical field of tunnel engineering. The method comprises thesteps of establishing an observation system, performing amplitude equalization and direct wave pickup, then extracting longitudinal and transverse wave velocities, and carrying out interference removal and filtering processing; preparing a two-dimensional longitudinal and transverse wave velocity and reflection interface diagram and a three-dimensional longitudinal wave velocity and reflection interface diagram; and finally, explaining a detection result, wherein polymer gel is used as a coupling agent; an orifice is blocked by a high-absorption attenuation material, interference wave can be suppressed, seismic wave signals are secured, meanwhile, a loop open-circuit triggering timing mode is adopted; the loop is bound on a seismic source; when the seismic source explodes to generate vibration propagation, the loop is exploded to trigger collection, there is no relation with detonator delay in the explosion generation process, trigger time errors basically do not exist under the condition that the bound loop does not fall off the seismic source, and through two-dimensional and three-dimensional refined geological prediction, the effects of tunnel dynamic design construction and cost saving can be achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a three-dimensional three-component advanced fine geological prediction method. Background technique [0002] Advanced Geological Prediction (TGP) or Tunnel Advanced Geological Prediction is to make an advanced prediction of the surrounding rock and formation conditions in front of and around the tunnel face (mainly railway tunnels) during tunnel excavation. Commonly used advanced geological prediction methods for tunnels are mainly divided into geological methods and geophysical methods. The geophysical method is a physical detection method for data information collection, processing and analysis based on the physical properties of the rock mass in front of the tunnel face. The seismic wave reflection method is one of the commonly used advance geological prediction and geophysical prospecting methods. By exciting the seismic wave and receiving the seismic reflected wa...

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Problems solved by technology

[0003] At present, there is no uniform standard for the division of advanced geological forecasting for underground engineering. Most of them are divided into two stages: long-term and short-term forecasting according to the detection distance of geophysical prospecting. There are few studies on the steps and methods, and few examples of practical application. In the comprehensive application of advanced geological prediction technology, it is common to make advanced geological predictions after advanced detection with only two or two advanced geophysical methods. In the construction of many tunnels, the staff are constantly optimizing the combination, but the existing advanced and refined geological forecast still has a mediocre prediction accuracy and a mediocre effect on optimal design and construction.

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