Mesoscopic structure simulation based rock stress relaxation property forecasting method

Abstract

The invention belongs to the field of geotechnical engineering and particularly relates to a mesoscopic structure simulation based rock stress relaxation property forecasting method. The mesoscopic structure simulation based rock stress relaxation property forecasting method comprises the following steps of (1) identifying mineral components and proportions of multiple mineral rock samples; (2) preparing each single mineral rock sample; (3) respectively carrying out a stress relaxation experiment on each single mineral rock sample; (4) establishing a stress relaxation model of each single mineral rock sample; (5) inverting to obtain a stress relaxation parameter of each single mineral rock sample; (6) carrying out random geometric modeling on the multiple mineral rock samples according to the mineral components and the proportions; and (7) calculating and forecasting the stress relaxation properties of the multiple mineral rock samples. By using the structure simulation based rock stress relaxation property forecasting method, the practical mineral component condition of a practical engineering rock mass can be simulated in a laboratory or other places, so that the application range of the mesoscopic structure simulation based rock stress relaxation property forecasting method is wide.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a method for predicting rock stress relaxation properties based on mesoscopic fabric simulation. Background technique [0002] The 21st century is the century of underground engineering. Underground hydropower stations, large-scale mine roadways, underground railways, river-crossing tunnels, underground oil storage caverns, etc. are being built on a large scale at home and abroad, and the long-term stability of these rock mass engineering is crucial to engineering safety important. Stress relaxation is quite common in geotechnical engineering, such as retaining walls, roadways and underground works in geotechnical engineering, which are often damaged due to the relaxation of internal stress in rock and soil. The stress relaxation of rock refers to the property that the stress of rock decays with time under the action of constant strain. The reason for stress relaxation i...

AI Technical Summary

Problems solved by technology

[0006] 1. The article "Stress Relaxation, Strain Hardening and Strain Softening of Rocks" introduces the test method for the stress relaxation of marble (see "Progress in Geophysics" No. 4, 1996, author: Wu Xiangyang, etc.). The laboratory used 800T high temperature and high pressure triaxial rheometer to conduct triaxial stress relaxation experiments on marble; but this method can only test the stress relaxation curve of small rock test pieces, and cannot predict the stress relaxation properties of large-scale engineering rock mass;

[0007] 2. The article "Experimental Research on Stress Relaxation Characteristics of Triaxial Compression of Silty Mudstone" introduces a kind of stress relaxation test of triaxial compression of saturated silty mudstone (see "Journal of Rock Mechanics and Engineering", Issue 4, 2011, author: Yu Huaichang, etc.), this method uses the RLJW-2000 rock triaxial rheological servometer to complete the triaxial compressive stress relaxation test of saturated silty mudstone under the condition of graded loading, but it is limited to reflect the laboratory Stress relaxation properties of small test pieces;

[0008] 3. The article "Stress Relaxation Experiment of Argillaceous Siltstone and Stability Control of Underground Chambers" introduces the stress relaxation experiment of argillaceous siltstone (see master's thesis of Shandong Agricultural University, author Zhang Jiawang). Uniaxial stress relaxation experiments are carried out by means of staged loading and separate loading, which are only suitable for laboratory small test block tests, and are difficult to apply to actual engineering, and the influence of various mineral components of rocks is not considered.

Images