Method for Determining the Whole Process of Rock Deformation and Failure Based on Four-parameter Test

Abstract

The invention discloses a method for determining the whole process of rock deformation and failure at the macro and micro levels based on four-parameter tests. Firstly, the acoustic emission data and deformation data of the sample in the compression test are obtained, and then the deformation data are calculated according to the finite deformation theory to obtain The average full rotation angle θ under each stress level; the G-P algorithm is used to calculate the acoustic emission data, and the time fractal dimension D of the acoustic emission signal is obtained T , according to the spatial projection method to calculate the spatial fractal dimension D S ; After the compression test is completed, the microscopic morphology of the rupture surface is obtained through the SEM scanning electron microscope test, and the fractal dimension D of the rupture surface is calculated A ; Finally, according to the obtained acoustic emission time fractal dimension D at each stress level T , AE space fractal dimension D S and the fracture surface fractal dimension D A Through comprehensive analysis with the average full rotation angle θ under the same stress level, θ and D T 、D S 、D A The quantitative relationship between the macro and micro in the whole process of rock deformation and failure is established.

Description

technical field [0001] The invention relates to a method for determining rock deformation and failure, in particular to a method for determining the macroscopic and microscopic whole process of rock deformation and failure based on a four-parameter test. Background technique [0002] At present, the phenomenon of rock creep instability and failure is common in rock engineering such as mines, underground spaces, tunnels and dams, and with the increase of the service life of rock engineering, rock creep instability and failure are prone to occur, resulting in rock mass or overlying buildings. Collapse poses a huge threat to people's lives and rock engineering safety. [0003] Rock creep refers to the phenomenon that the deformation of the rock increases slowly with time under the action of an external constant load. This deformation process will cause a large delayed strain of the rock. As time changes, the rock will eventually form rock deformation and failure. In the proces...

AI Technical Summary

Problems solved by technology

Due to the complexity of rock deformation and failure, in order to reveal its mechanism, it is necessary to jointly analyze from both macro and mesoscopic perspectives to establish a bridge between the macroscopic failure process and mesoscopic structural changes. However, at present, the independent measurement and analysis of macroscopic and mesoscopic parameters, did not establish a connection

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