岩土力学2024，Vol.45Issue(5)：1334-1342,9.DOI:10.16285/j.rsm.2023.0896
层状岩石不排气三轴压缩力学特性试验研究
Gas-undrained triaxial compression mechanical properties test of layered rock
摘要
Abstract
In order to study the influence of confining pressure and pore pressure on the mechanical properties and deformation parameters during underground tunnel excavation,a gas-undrained triaxial compression test of layered phyllite was carried out with argon as the permeable medium.The study analyzed the evolution characteristics of stress-strain relationship,peak strength,deformation characteristics and failure modes of layered phyllite with bedding inclinations under varying confining pressure and pore pressure.Additionally,an anisotropy degree formula based on bedding inclinations was introduced to discuss the impacts of confining pressure and pore pressure on the anisotropy of layered phyllite.The results show that the peak strength of layered phyllite increases gradually as the pore pressure decreases or the confining pressure increases.The peak strength σc,elastic modulus and deformation modulus exhibit'U'shaped changes with an increase in bedding inclinations.When the bedding inclination ranges between 30° and 60°,the layered phyllite has a low degree of hardness,and the predominant failure mode is shear slip along the bedding plane.Furthermore,the layered phyllite is greatly affected by confining pressure and pore pressure in the direction of parallel bedding,showing significant anisotropic characteristics.关键词
层状岩石/层理倾角/各向异性/不排气三轴压缩/破坏形式Key words
layered rock/bedding inclinations/anisotropy/gas-undrained triaxial compression/failure mode分类
建筑与水利引用本文复制引用
王伟,罗霄,陈超,刘世藩,段雪雷,朱其志..层状岩石不排气三轴压缩力学特性试验研究[J].岩土力学,2024,45(5):1334-1342,9.基金项目
国家自然科学基金项目(No.12072102) （No.12072102）
江苏省六大人才高峰项目(No.JZ008) （No.JZ008）
江苏省青蓝工程项目.This work was supported by the National Natural Science Foundation of China(12072102),the Six Talent Peaks Project in Jiangsu Province(JZ008)and the Program to Cultivate Middle-aged and Young Science Leaders of Colleges and Universities of Jiangsu Province. （12072102）
