Reconstructed method of porous sandstone and mechanical properties research

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Yuan, Yangkou^1 ; Liu, Chengbin^1

Department of Hydraulic and Architectural Engineering, Beijing Vocational College of Agriculture, Beijing

102442, China^1

关键词: Failure distributions;    Image processing technology;    Influence degree;    Numerical simulation experiment;    Statistic theory;    Structure parameter;    Tensile failures;    Tension-shear failures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/3/032071/pdf
DOI  :  10.1088/1755-1315/237/3/032071

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Based on the statistic theory and image processing technology, a three-dimensional reconstructed model of pore structure for sandstone is established. On the basis of the model, the numerical simulation experiment is carried out to analyze the influence of pore structure parameters (pore size, shape and porosity) on the deformation, stress distribution and failure distribution of sandstone under the splitting load. The research results show that the effect of void morphology on the damage of sandstone is obvious. With the change of the pore shape from the ellipsoid to the sphere, the fracture zone of the splitting disc is increased and more dispersed. With the pore shape is changed from sphere to ellipsoid, the maximum stress along the Y direction is firstly decreased and then increased. When the pore size increases, the failure mode becomes a single tensile failure from an induced-tension-shear failure, and the maximum stress along the Y direction is decreased. But the influence degree is weakened with the increase of the pore size of the model. Along with the increase of the porosity, the maximum stress along the Y direction is increased, therefore, the sandstone is easy to damage. But the degree of influence decreases with the increase of pore size. The results reveal the influence of the parameters of the pore structure on the mechanical properties of rock, which provide some reference for the study of the effect of pore structure on the rock physical mechanical properties.