Mechanical properties and dilatancy angle model of jointed hard rock under true triaxial cyclic loading and unloading
Hong Xu1
Gang Wang2
Quan Jiang3
Shili Qiu3
Guangliang Feng3
Xiang Huang1
1.School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China2.Power China Huadong Engineering Corporation Limited,Hangzhou 310014,Zhejiang,China3.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
摘要：Joints play a crucial role in the stability of surrounding rock in deep underground engineering.Studying the mechanical properties and evolution laws of rocks with different joint characteristics under true triaxial stress is highly significant.This paper presents the results of a series of true triaxial cyclic loading and unloading experiments conducted on natural stiff-jointed and artificially jointed granite,where the correlation between fracture characteristics and joint inclination was investigated.It was observed that the peak strength,plastic volumetric strain,and failure mode of the jointed granite varied considerably with joint inclination.This underscores the significant influence of joint inclination on the mechanical behavior of deep granite.Building upon a comprehensive understanding of the strength characteristics and deformation evolution in jointed granite with varying inclinations,a new dilation angle model was developed,incorporating the coupling effects of plastic volumetric strain and joint inclination.A strong agreement was found between our theoretical predictions and test data,suggesting that the proposed dilation angle model can effectively describe the dilatancy characteristics of granite with joints.This study is anticipated to offer a theoretical basis for excavation and support design,as well as stability analysis of deep jointed rock masses.
机标关键词：anglerockmodelcyclicdilatancyhardjointedmechanical
论文发表日期：2025-12-31
在线出版日期：2026-01-30（本平台首次上网日期，不代表文献的发表时间）
页数：14( 95-108 )
英文信息