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Open AccessArticle

Experimental Characterization of Stress- and Strain-Dependent Stiffness in Grouted Rock Masses

1
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
2
Department of Civil Engineering, Sunchon National University, 225 Jungang-ro, Suncheon 57922, Korea
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 524; https://doi.org/10.3390/ma11040524
Received: 14 March 2018 / Revised: 26 March 2018 / Accepted: 27 March 2018 / Published: 29 March 2018
Grouting of fractured rock mass prior to excavation results in grout-filled discontinuities that govern the deformation characteristics of a site. The influence of joint characteristics on the properties of grouted rocks is important in assessing the effects of grouting on jointed rock mass. However, grouting remains a predominantly empirical practice and the effects of grouting on rock joint behavior and material properties have yet to be accurately assessed. Granular materials, including jointed rocks, typically display nonlinear strain-dependent responses that can be characterized by the shear modulus degradation curve. In this study, the effects of grouting on the strain-dependent shear stiffness of jointed rock mass were investigated at the small-strain (below 10−5) and mid-strain (10−5 to 10−3) ranges using the quasi-static resonant column test and rock mass dynamic test devices. The effects of curing time, axial stress, initial joint roughness, and grouted joint thickness were examined. The results show that (1) grouting of rock joints leads to decreased stress sensitivity and increased small-strain shear stiffness for all tested samples; (2) the grouted rock samples display similar modulus degradation characteristics as the applied grout material; (3) the initial joint roughness determines the stress-dependent behaviors and general stiffness range of the jointed and grouted rocks, but the strain-dependent behaviors are dependent on the properties of the grout material; (4) increased grouted joint thickness results in larger contribution of the grout properties in the overall grouted rock mass. View Full-Text
Keywords: rock grouting; equivalent continuum; shear wave propagation; strain-dependency; modulus degradation rock grouting; equivalent continuum; shear wave propagation; strain-dependency; modulus degradation
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MDPI and ACS Style

Kim, J.-W.; Chong, S.-H.; Cho, G.-C. Experimental Characterization of Stress- and Strain-Dependent Stiffness in Grouted Rock Masses. Materials 2018, 11, 524.

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