Effect of confining pressure on deformation and strength of granite in confined direct tension tests
Huang, Da1,2; Liu, Yang1; Cen, Duofeng1; Zeng, Bin3; Wu, Zhijun4; Yang, Yongtao5
AbstractTo investigate the effect of confining pressure on tensile deformation and strength of rocks, a series of confined direct tension tests (CDTT) were conducted on cylindrical granite samples. The results indicate that the deformation/damage process contains the initial micro-crack opening stage and elastic deformation stage. The axial peak strain, radial peak strain, volumetric peak strain, elastic modulus, and Poisson's ratio all increase with the increase of confining pressure. The strength envelope behaves an interesting "bulge" phenomenon, namely the tensile strength increases and reaches a maximum and then decreases as the confining pressure increases, and the possible reason is suggested that the different levels of confining pressure can cause changes in the magnitude of friction force in the steep dip grain interface and the shear stress in the small inclination grain interface. As the confining pressure goes up, the macrofailure pattern of granite sample under CDTT shows a continuous transition from tensile failure to mixed tensile-shear failure and to shear failure, and further to the compression-shear failure. A new strength criterion, containing a parabolic segment and a linear segment, to consider the "bulge" phenomenon of the strength envelope was proposed. It was examined using the tested data of granite as well as the previous data of Carrara marble, Berea sandstone, and Longmaxi shale, behaving a good fitting effect.
KeywordConfined direct tension test Tensile deformation Tensile strength Strength criterion Triaxial compression test
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41972297] ; National Natural Science Foundation of China[41807279] ; Natural Science Foundation of Tianjin Municipality, China[20JCQNJC00980] ; Natural Science Foundation of Hebei Province, China[E2019202336] ; Supporting program of hundred promising innovative talents in Hebei provincial education office[SLRC2019027] ; Chongqing Postdoctoral Science Foundation[cstc2019jcyj-bshX0125] ; China Postdoctoral Science Foundation[2019M653343]
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Environmental ; Engineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000759643100005
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Hebei Univ Technol, Sch Civil & Transportat Engn, Tianjin 300401, Peoples R China
2.Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Peoples R China
3.Chongqing Jiaotong Univ, Key Lab Geol Hazards Mitigat Mt Highway & Waterwa, Chongqing Municipal Educ Commiss, Chongqing 400074, Peoples R China
4.Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
Recommended Citation
GB/T 7714
Huang, Da,Liu, Yang,Cen, Duofeng,et al. Effect of confining pressure on deformation and strength of granite in confined direct tension tests[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2022,81(3):20.
APA Huang, Da,Liu, Yang,Cen, Duofeng,Zeng, Bin,Wu, Zhijun,&Yang, Yongtao.(2022).Effect of confining pressure on deformation and strength of granite in confined direct tension tests.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,81(3),20.
MLA Huang, Da,et al."Effect of confining pressure on deformation and strength of granite in confined direct tension tests".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 81.3(2022):20.
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