Three-dimensional visualizable simulation method for crack propagation and water burst of tunnel surrounding rock

Abstract

The invention provides a three-dimensional visualizable simulation method for crack propagation and water burst of tunnel surrounding rock, belonging to the field of geotechnical engineering simulation testing methods. The simulation method comprises the following steps: (1) soaking a transparent similar material tunnel model into transparent liquid with a same refractive index as the model and employing a uniform LED light source to irradiate the model; (2) arranging a three-dimensional digital image acquisition system at one side or two sides of the model to shoot the three-dimensional image of a crack in the model, wherein an opaque phenomenon occurs where a crack is generated in the process of tunnel excavation and disintegration of surrounding rocks; (3) carrying out real-time acquisition of the whole process of crack propagation and evolution, wherein cracks appearing at a former stage disappear due to filling of the transparent liquid, which prevents influence on observation of cracks appeared at a subsequent stage; and (4) subjecting acquired image sequences to processing and analysis so as to obtain the actual evolution process of three-dimensional crack propagation. The method is capable of actually reproducing the three-dimensional crack propagation of the tunnel surrounding rock, simple to operate, visual in process and reliable in results.

Description

technical field [0001] The invention relates to a geotechnical engineering simulation test method, in particular to a three-dimensional visualization simulation method for the crack expansion of the tunnel surrounding rock and the water inrush process of the surrounding rock. Background technique [0002] In the field of geotechnical engineering simulation test, real-time acquisition of the real process of internal deformation and crack propagation in the model is a reliable premise for the research on the instability mechanism and stability control technology of engineering surrounding rock. [0003] At present, the methods that can be used to detect the crack growth inside the model mainly include CT scanning, ultrasonic detection and transparent model test. The first two methods not only have strict requirements on model size and mold material, but also the accuracy and intuition of data acquisition are not ideal, and CT scanning cannot realize continuous acquisition. Al...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a three-dimensional visualization simulation method for the crack expansion in the surrounding rock of the tunnel and the water inrush process in the surrounding rock, so as to solve the problem that the existing various methods cannot obtain the real expansion process of the internal crack in the model in real time, and to realize the internal simulation of the model. The real-time and accurate acquisition of the crack propagation process provides reliable basic data for the study of the instability mechanism and stability control technology of the tunnel surrounding rock