Mesoscopic structure simulation based rock creep property forecasting method

Abstract

The invention belongs to the field of geotechnical engineering and particularly relates to a mesoscopic structure simulation based rock creep property forecasting method. The mesoscopic structure simulation based rock creep 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 creep experiment on each single mineral rock sample; (4) establishing a creep model of each single mineral rock sample; (5) inverting to obtain a creep 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 creep properties of the multiple mineral rock samples. By using the structure simulation based rock creep 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 creep property forecasting method is wide.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a rock creep property prediction method 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. In fact, the deformation of the rock does not occur instantaneously after the excavation is completed, but gradually changes with time. Even in some broken surrounding rocks, the creep deformation is far greater than the instantaneous deformation. Creep of rock refers to the property that the strain of rock increases with time under constant stress. Therefore, the creep property of rock is a very im...

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Problems solved by technology

[0006] 1. The article "Comparison and Correction of Rock Creep Models" introduces a method for predicting experimental curves of rock creep models (see "Experimental Mechanics" No. 1, 2008, author: Li Chengbo, etc.), this method is suitable for three The rock was subjected to creep experiments under different stresses, and the experimental creep curve was divided into two parts, the first part was used for the inversion of model parameters, and the second part was used for the verification of model prediction data; but this method can only predict rock The creep curves of small test blocks cannot predict the creep properties of large-scale engineering rock mass;

[0007] 2. The article "Inversion of Compressive Creep Parameters of Deep Rock Mass Under Rigid Bearing Plates" introduces a method to study rock mass creep properties through on-site large-scale rigid bearing plate compression creep tests (see "Rock and Soil Mechanics" 2009 No. 3 of 2010, author: Yang Wendong, etc.), this method uses a circular rigid bearing plate with a diameter of 1 meter to apply continuous compressive loads on the surface of the rock mass in the dam area of ​​the hydropower station to study the creep properties of the rock mass on site. The test scale is larger than that of the laboratory test block, but it is also limited to reflect the creep mechanical properties of the local area of ​​the experimental project, and it costs a lot of money;

[0008] 3. The article "Research on Creep and Mesoscopic Experiments of High Stress Rocks" introduces a method of using CT real-time imaging system to record crack propagation and damage during rock creep to infer rock creep properties (see Master's thesis of Jiangxi University of Science and Technology, author Zhai Youjing), the test method is only suitable for small test blocks in the laboratory, and it is difficult to apply to actual engineering;

[0009] 4. The article "Numerical Simulation Research on Meso-Mechanical Characteristics of Creep Damage Evolution of Jinping Marble Rock" introduces a method for analyzing the mechanical mechanism of creep damage and fracture of rock using the two-dimensional particle flow numerical simulation method (PFC2D) (See "Rock and Soil Mechanics" No. 12, 2013, author: Sun Jinshan, etc.), this method studies the creep fracture of rock samples caused by the expansion of internal micro-cracks from the perspective of mesomechanics. method, but does not take into account the influence of the various mineral compositions of rocks

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