(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy
of Sciences,Wuhan,Hubei 430071,China;2. Gansu Provincial Transportation Planning,Survey and Design Institute Co.,Ltd.,Lanzhou,Gansu 730000,China)
Abstract:Simulated rock joint samples with different first-order and second-order asperity heights are casted by high strength gypsum material. A series of CNL(constant normal load) shear tests are carried out to study the shear strength characteristics of joints with different first-order and second-order asperity heights under different normal stresses. The influences of first-order and second-order asperity heights and normal stress on shear strength are analyzed. Based on the experimental results,it can be found that the joint samples with second-order asperity have multi-peak shear stresses,while the joint samples only with first-order asperity have not apparent peak shear stress. The shear strength increases with the increasing first-order and second-order asperity heights and normal stress. With the increasing ratio of second-order asperity height to first-order asperity height,shear strength first increases and then decreases. Finally,an empirical formula is proposed by regression analysis of experimental data to predict the shear strength. The formula can reflect the influences of first-order and second-order asperity heights and normal stress on shear strength.
李海波,冯海鹏,刘 博. 不同剪切速率下岩石节理的强度特性研究[J]. 岩石力学与工程学报,2006,25(12):2 435-2 440.(LI Haibo,FENG Haipeng,LIU Bo. Study on strength behaviors of rock joints under different shearing deformation velocities[J]. Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2 435-2 440.(in Chinese))
[2]
李海波,刘 博,冯海鹏,等. 模拟岩石节理试样剪切变形特征和破坏机制研究[J]. 岩土力学,2008,29(7):1 741-1 746.(LI Haibo,LIU Bo,FENG Haipeng,et al. Study of deformability behaviour and failure mechanism by simulating rock joints sample under different loading conditions[J]. Rock and Soil Mechanics,2008,29(7):1 741- 1 746.(in Chinese))
[3]
刘 博. 节理面循环剪切特性研究[博士学位论文][D]. 北京:中国科学院研究生院,2009.(LIU Bo. Study on mechanical properties of rock joint planes under cyclic shear loading[Ph. D. Thesis][D]. Beijing:Graduate University,Chinese Academy of Sciences,2009.(in Chinese))
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