Rock uniaxial compression accelerated creep starting time prediction method

Abstract

The invention discloses a rock uniaxial compression accelerated creep starting time prediction method, which comprises the following steps: determining parameters of an improved Maxwell model according to a rock uniaxial compression creep test result; drawing the change rule curve of the viscosity coefficient along with the time and the rock creep curve under the corresponding axial stress in a double-longitudinal-axis coordinate system, determining an attenuation creep end point A, and drawing a vertical line passing through the point A, wherein the vertical line and the change rule curve of the viscosity coefficient along with the time intersect at a point B; and drawing a horizontal line passing through the point B, intersecting the horizontal line and the time-varying rule curve of the viscosity coefficient at a point C, and taking the time corresponding to the point C as the accelerated creep starting time of the rock. According to the method, the starting time of the rock uniaxial compression accelerated creep can be accurately predicted by improving the Maxwell model, accurate prediction of the starting time of the rock accelerated creep is realized, early warning can be performed during rock accelerated creep, and occurrence of harm of surrounding rock collapse to lives and properties of people is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of rock engineering, and in particular relates to a method for predicting the start time of rock uniaxial compression accelerated creep. Background technique [0002] The complete creep process of rock usually includes three stages: attenuation creep, steady state creep and accelerated creep. Although the rock creep damage time can be predicted according to the Kachanov creep damage law, for underground engineering, in order to ensure the safety of people's lives and property, the surrounding rock collapse is not allowed. Once the deformation of the surrounding rock enters the stage of accelerated creep, it must be supported immediately to ensure the stability of the surrounding rock. Therefore, it is of great significance to accurately determine and predict the initiation time of rock accelerated creep. At present, there are few studies on the determination and prediction methods of the initiation time of...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the determination and prediction methods of the initiation time of accelerated rock creep.

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