A Voronoi tessellated model considering damage evolution for modeling meso-mechanical mechanism of the sandstone

被引:2
作者
Ji, Dongliang [1 ]
Cheng, Hui [2 ]
Zhao, Hongbao [2 ]
机构
[1] Shijiazhuang Tiedao Univ, State Key Lab Mech Behav & Syst Safety Traff Engn, Key Lab Mech Behav Evolut & Control Traff Engn Str, Shijiazhuang 050043, Peoples R China
[2] China Univ Min & Technol Beijing, Sch Energy & Min Engn, Beijing, Peoples R China
关键词
Voronoi tessellated model; Crystal size; Strain energy density; Damage evolution; Meso-mechanical mechanism; NUMERICAL MANIFOLD METHOD; GRAIN-STRUCTURE; SIMULATION; STRENGTH; STABILITY; BEHAVIOR; SCALE;
D O I
10.1016/j.enganabound.2023.11.013
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The strength of sandstone samples considering different particle sizes is required in many engineering applica-tions. A rock model based on the Voronoi tessellated model is established for studying the failure mechanism of sandstone samples. Uniaxial compression, Brazilian splitting and triaxial compression tests are carried out to evaluate the influence of different crystal sizes on macroscopic parameters of sandstone. The uniaxial compressive strength, elastic modulus and tensile strength of the specimens show an increasing trend with the decrease in the crystal size. Failure with redistributed stress has been observed, and strain energy density (SED) can help explain the failure mechanisms. Additionally, a constitutive model is compiled to reproduce the damage evolution taking into account the heterogeneity in elastic modulus and rock strength, which is in good agreement with the experimental results. In the engineering application, it is found that the damage on the surface of the slope is triggered by the action of vibration excitation. The dynamic response of the slope is more intense if the vibration frequency reaches its optimal frequency. The proposed constitutive model is used to quantitatively evaluate the accumulation of damage of the Mining-by tunnel. This work is anticipated to be extensively utilized in other engineering applications.
引用
收藏
页码:446 / 467
页数:22
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