Experimental research on the shear strength of thinly-infilled rock joints during shearing
XIAO Weimin1，2，YU Huan1，2，LI Rui1，2，JIANG Kun3
(1. School of Civil Engineering，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；2. Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；3. Dalian Municipal Design and Research Institute Co.，Ltd.，Dalian，Liaoning 116001，China)
Abstract：The shear strengths of thinly-infilled rock joints are different from both clean rock joints and thickly-infilled rock joints. In order to study their shear strength characteristics，fine digitization was performed on five standard profiles proposed by Barton，and on the bases of which rock joint surfaces with standard profile topography were duplicated by using 3D printing technology. Then cement paste was used to prepare rock joints specimens. Quartz sands were adopted as infill to prepare thinly-infilled rock joints with infill thickness to asperity height ratios of 0.0，0.25，0.5，0.75 and 1.00. The laboratory direct shear tests were carried out on and corresponding shear stress vs. shear displacement curves，shear dilation curves and failure properties were obtained，and then the effects of infill thickness to asperity height ratio and joint roughness on the peak shear strength and dilation of thinly-infilled rock joints were analysed. The results indicate that both the peak shear strength and dilation decrease with infill thickness to asperity height ratio and the influence of joint roughness on the peak shear strength also decrease with infill thickness to asperity height ratio. Furthermore，the failure characteristics of thinly-infilled rock joints after shearing were significantly affected by infill thickness to asperity height ratio and joint roughness.
肖维民1，2，余 欢1，2，李 锐1，2，蒋 坤3. 薄层充填岩石节理抗剪强度特性试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3420-3428.
XIAO Weimin1，2，YU Huan1，2，LI Rui1，2，JIANG Kun3. Experimental research on the shear strength of thinly-infilled rock joints during shearing. , 2019, 38(S2): 3420-3428.
夏才初. 工程岩体节理力学[M]. 上海：同济大学出版社，2002：3–4.(XIA Caichu. Engineering jointed rock mechanics[M]. Shanghai：Tongji University Press，2002：3–4.(in Chinese))
[2]
BARTON N. A review of the shear strength of filled discontinuities in rock[R]. Oslo：Norwegian Geotechnical Institute，1974.
[3]
LADANYI B，ARCHAMBAULT G. Shear strength and deformability of filled indented joints[C]// Proceedings of International Symposium on Geotechnics of Structurally Complex Formations. Capri，Italy：[s. n.]，1977：317–326.
[4]
PHIEN-WEJ N，SHRESTHA U B，RANTUCCI G. Effect of infill thickness on shear behaviour of rock joints[C]// Proceedings of the International Conference on Rock Joints. Loen：[s. n.]，1990：289–294.
[5]
PAPALIANGAS T，HENCHER S R，LUMSDEN A C，et al. The effect of frictional fill thickness on the shear strength of rock discontinuities[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1993，30(2)：81–91.
[6]
DE TOLEDO P E C，DE FREITAS M H. Laboratory testing and parameters controlling the shear strength of filled rock joints[J]. Géotechnique，1993，43(1)：1–19.
[7]
PEREIRA J P. Rolling friction and shear behavior of rock discontinuities filled with sand[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(3/4)：244.
[8]
INDRARATNA B，HAQUE A，AZIZ N. Shear behavior of idealized filled joints under constant normal stiffness[J]. Géotechnique，1999，49(3)：331–355.
[9]
INDRARATNA B，WELIDENIYA H S，BROWN E T. A shear strength model for idealized filled joints under constant normal stiffness[J]. Géotechnique，2005，55(3)：215–226.
[10]
INDRARATNA B，JAYANATHAN M，BROWN ET. Shear strength model for overconslidated clay-infilled idealized rock joints[J]. Géotechnique，2008，58(1)：55–65.
[11]
INDRARATNA B，OLIVEIRA D A F，BROWN E T. A shear-displacement criterion for soil-filled rock discontinuities[J]. Géotechnique，2010，60(8)：623–633.
[12]
INDRARATNA B，PREMADASA W，BROWN E T. Shear behaviour of rock joints with unsaturated infill[J]. Géotechnique，2013，63(15)：1 356–1 360.
[13]
INDRARATNA B，PREMADASA W，BROWN E T，et al. Shear strength of rock joints influenced by compacted infill[J]. International Journal of Rock Mechanics and Mining Sciences，2014，70：296–307.
[14]
BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics and Rock Engineering，1977，10(1/2)：1–54.
[15]
李 锐，肖维民. 基于Barton标准剖面线精细数字化处理的岩石节理JRC计算新公式研究[J]. 岩石力学与工程学报，2018，37(增1)：3 515–3 522.(LI Rui，XIAO Weimin. Study on a new equation for calculating JRC based on fine digitization of standard profiles proposed by Barton[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(Supp.1)：3 515–3 522.(in Chinese))
[16]
International Society for Rock Mechanics Commission on Standardization of Laboratory and Field Tests. Suggested methods for the quantitative description of discontinuities in rock masses[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1978，15(6)：319–368.
[17]
BARTON N. Review of a new shear-strength criterion for rock joints[J]. Engineering Geology，1973，7(4)：287–332.
2019, Vol. 38 
