真三轴作用下不同中间主应力含缺陷砂岩破坏过程颗粒流模拟
论文题目
Particle Flow Simulation of Failure Process of Defective Sandstone under Different Intermediate Principal Stress under True Triaxial Action
2 School of Architectural Engineering, Guizhou University for Nationalities, Guiyang 550025, China；
3 School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China；
4 Guizhou Geological Environment Monitoring Institute, Guiyang 550025, China；
* Correspondence: suhygzmd@163.com
研究内容
Abstract:In order to explore the mechanical response characteristics of fractured sandstone under true triaxial different medium principal stresses, matdem particle flow software was used to study the mechanical response characteristics, fracture mechanism and damage evolution characteristics of sandstone specimens under the conditions of 30 MPa, 40 MPa and 50 MPa respectively. The simulation results are verified by true triaxial test. The results show that under true triaxial stress, the increase of medium principal stress is beneficial to increase the strength of sandstone. The fracture degree of the specimen increases with the increase of the intermediate principal stress, and finally the interlacing macroscopic cracks are formed. When the intermediate principal stress is perpendicular to the fracture strike, the fracture mode of sandstone is that the macroscopic fracture plane is perpendicular to the fracture strike, and the fracture mechanism of sandstone under true triaxial compression is mainly shear failure, accompanied by tensile failure. With the increasing of the intermediate principal stress, the fractal dimension of the fracture of sandstone specimen increases significantly and the degree of fracture deepens. Combined with the true triaxial test results, the rationality of particle flow simulation test is proved.
with different intermediate principal stresses.
under different medium principal stresses.
FIGURE 7 Fracture development characteristics under different intermeldiate principal stresses.
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