不同加载路径下大理岩的强度特征研究  

Study on Strength Characteristics of Marble under Different Loading Paths

作　　者：侯家文 田浩源 程宏梁 HOU Jiawen;TIAN Haoyuan;CHENG Hongliang(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China;Wuhan Surveying-Geotechnical Research Institute Co.,LTD.OF MCC,Wuhan 430080,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]中冶集团武汉勘察研究院有限公司,湖北武汉430080

出　　处：《湖北工业大学学报》2024年第2期111-115,共5页Journal of Hubei University of Technology

摘　　要：选取锦屏大理岩为研究对象,进行恒定围压下的三轴压缩试验、逐步增加围压的三轴压缩试验以及卸围压的三轴压缩试验,研究大理岩岩样在不同加载路径下的强度演化特征。研究结果表明:在恒定围压下的三轴压缩试验中,环向应力级别每提升5 MPa,试件的强度增大约30%;相对于恒定围压下的三轴压缩试验,逐步增加围压的三轴压缩试验黏聚力增加,内摩擦角降低,而卸围压的三轴压缩试验与之相反;在不同的加载路径中,卸围压的三轴压缩试验最易破坏,而逐步增加围压的三轴压缩试验由于经历太多塑性变形,并不能很好地提升试件的强度。The marble specimens of Jinping marble were subjected to triaxial compression test,confining compression triaxial compression test and unloading confining pressure test,and the strength evolution characteristics of marble samples under different loading paths are studied.The results show that in the constant confining pressure test,when the confining pressure increases by 5MPa,the strength of the specimen increases by 30%.Compared with the conventional triaxial compression test,the cohesion increased and the internal friction angle decreased in confining pressure increasing test,but it was opposite in confining pressure relieving test.In different loading paths,unloading confining pressure test is easier to be destroyed than the conventional triaxial compression test.Because of too much plastic deformation,increasing confining pressure test can not improve the strength of specimens.

关 键 词：大理岩 三轴压缩 加围压、卸围压 强度特征 加载路径 

分 类 号：TU45[建筑科学—岩土工程]