Meso-mechanical properties of hollow-cylinder gray sandstone under the rotation of principal stress axes
Liang Fang,Yue Jiang,Jingjing Lu Wendong Zou,Yang Gao,Feifei Jiang
Abstract
This study aims to quantitatively elucidate the mechanisms by which principal stress axis orientation controls the mechanical behavior of rock, focusing on both macroscopic mechanical behavior and microscopic failure processes. Three types of complex stress-path tests were conducted on hollow-cylinder gray sandstone specimens using PFC3D. The study identifies that crack growth is governed by the principal stress orientation under low axial stress, while non-coaxial deformation dominates under high axial stress, leading to reduced influence of stress orientation and more complex fracture patterns. Based on acoustic emission monitoring data obtained from the numerical simulations, two novel indices, namely damage efficiency (DE) and non-coaxial damage index (NCDI), are proposed. These indices quantitatively characterize the coupling effect between stress axis rotation and damage accumulation in rock. These findings provide deeper insight into the failure mechanisms of rocks under nonconventional stress paths and support improved design and risk assessment in geotechnical engineering.
Key Words
discrete element method (pfc3d); hollow cylindrical gray sandstone; mechanical response; principal stress axes rotation; stress path
Address
iang Fang, Wendong Zou
— School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215099, China
Yue Jiang — School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215099, China; State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China ingjing Lu
Yang Gao, Feifei Jiang — State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
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