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| Experimental study on shear and deformation characteristics of the rod-grout interface |
| ZHANG Chuanqing1，2，CUI Guojian1，2，ZHOU Hui1，2，LIU Lipeng3，LIU Zhenjiang1，2，LU Jingjing1，2，CHENG Guangtan1，2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing，100049，China；3. Department of Geotechnical Engineering，China Institute of Water Resources and Hydropower Research，Beijing 100048，China) |
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Abstract In order to study the mechanical properties and failure modes of the rod-grout interface，the direct shear tests of the rod-grout interface under different normal stresses and rib spacings were carried out. The characteristics of shear stress-shear displacement curves and dilatation curves were discussed，and the shear strength and the failure modes of the interface were analyzed and explained in detail. Four stages were observed in the shear stress-shear displacement curves and three stages were observed in the dilation curves. The experimental results indicated that the rod-grout interface had a strong characteristic of brittle failure，and the degree of brittleness decreased with the increasing of rib spacing. The failure modes of interface can be divided into the dilation slip failure，the shear through failure and the compound failure. With the increasing of the normal stress，the normal displacement decreased significantly and the failure mode transformed gradually from the dilation slip failure to the shear through failure. The normal displacement and the possibility of dilation slip failure increased significantly with the increasing of rib spacing. In addition，the shear stress in interface at dilation initiation was approximately 0.5 of the peak shear strength.
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| [1] 冯夏庭，张传庆，陈炳瑞，等. 岩爆孕育过程的动态调控[J]. 岩石力学与工程学报，2012，31(10)：1 983–1 997.(FENG Xiating，ZHANG Chuanqing，CHEN Bingrui，et al. Dynamical control of rockburst evolution process[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(10)：1 983–1 997.(in Chinese))
[2] 中国科学院武汉岩土力学研究所973计划(2010CB732000)项目办公室. 深部重大工程灾害的孕育演化机制与动态调控理论研究进展[J]. 中国基础科学，2014，16(4)：11–21.(The Project Office for 973 Project“Theories on evolution mechanism and Dynamical Control of Great Disasters in Deep Engineering”Institute of Rock and Soil Mechanics，Chinese Academy of Sciences. Researches on theories of evolution mechanism and dynamical control of great disasters in deep engineering[J]. China Basic Science，2014，16(4)：11–21.(in Chinese))
[3] CAI Y，ESAKI T，JIANG Y. A rock bolt and rock mass interaction model[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(7)：1 055–1 067.
[4] AZIZ N，JALAIFAR H，CONCALVES J. Bolt surface configurations and load transfer mechanism[C]// Proceedings of the 7th Underground Coal Operators Conference. Wollongong：[s. n.]，2006：236–244.
[5] CAO C. Bolt profile configuration and load transfer capacity optimization[Ph. D. thesis][D]. Wollongong：University of Wollongong，2012.
[6] CAO C，NEMCIK J，AZIZ N，et al. Analytical study of steel bolt profile and its influence on bolt load transfer[J]. International Journal of Rock Mechanics and Mining Sciences，2013，60：188–195.
[7] BLANCO M L，TIJANI M，HADJ–HASSEN F，et al. Assessment of the bolt—grout interface behaviour of fully grouted rockbolts from laboratory experiments under axial loads[J]. International Journal of Rock Mechanics and Mining Sciences，2013，63：50–61.
[8] HAGAN P，CHEN J. The load transfer mechanism of fully grouted cable bolts under laboratory tests[C]// Proceedings of 14th Coal Operators? Conference. Wollongong：[s. n.]，2014：137–146.
[9] LI C C，KRISTJANSSON G，HØIEN A H. Critical embedment length and bond strength of fully encapsulated rebar rockbolts[J]. Tunnelling and Underground Space Technology，2016，59：16–23.
[10] AZIZ N. A New Technique to Determine the Load Transfer Capacity of Resin Anchored Bolts[C]// Proceedings of the 3rd Australian Coal Operators Conference. Wollongong：[s. n.]，2002：176–185.
[11] LAM T S，JOHNSTON I W. Shear behavior of regular triangular concrete/rock joints—evaluation[J]. Journal of geotechnical engineering，1989，115(5)：728–740.
[12] JOHNSTON I W，LAM T S K，WILLIAMS A F. Constant normal stiffness direct shear testing for socketed pile design in weak rock[J]. Geotechnique，1987，37(1)：83–89.
[13] KODIKARA J K，JOHNSTON I W. Shear behaviour of irregular triangular rock–concrete joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(4)：313–322.
[14] GHAZVINIAN A H，AZINFAR M J，GERANMAYEHVANEGHI R. Importance of tensile strength on the shear behavior of discontinuities[J]. Rock Mechanics and Rock Engineering，2012，45(3)：349–359.
[15] GHAZVINIAN A H，TAGHICHIAN A，HASHEMI M，et al. The shear behavior of bedding planes of weakness between two different rock types with high strength difference[J]. Rock Mechanics and Rock Engineering，2010，43(1)：69–87.
[16] 梁炯望. 锚固与注浆技术手册[M]. 北京：中国电力出版社，1999：39–54.(LIANG Jiongjun. Anchoring and grouting technique manual[M]. Beijing：China Electric Power Press，1999：39–54.(in Chinese))
[17] HYETT A J J，BAWDEN W F，MACSPORRAN G R，et al. A constitutive law for bond failure of fully–grouted cable bolts using a modified hoekcell[J]. International Journal of Rock Mechanics and Mining Sciences，1995，32(1)：11–36.
[18] CAO C，REN T，COOK C，et al. Analytical approach in optimizing selection of rebar bolts in preventing rock bolting failure[J]. International Journal of Rock Mechanics and Mining Sciences，2014，72：16–25.
[19] BARTON N. Modelling rock joint behavior from in situ block tests：implications for nuclear waste repository design[R]. Columbus：Office of Nuclear Waste Isolation，1982：39–43.
[20] OH J，CORDING E J，MOON T. A joint shear model incorporating small–scale and large–scale irregularities[J]. International Journal of Rock Mechanics and Mining Sciences，2015，76：78–87.
[21] 沈明荣，张清照. 规则齿型结构面剪切特性的模型试验研究[J]岩石力学与工程学报，2010，29(4)：713–719.(SHEN Mingrong，ZHANG Qingzhao. Experimental study of shear deformation characteristics of rock mass discontinuities[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：713–719. (in Chinese)) |
| [1] |
LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2018, Vol. 37 
