Shear Strength of Rock Joints and Its Estimation
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0296-7
Geotechnical Engineering
Shear Strength of Rock Joints and Its Estimation Moorak Sona Member, Dept. of Civil Engineering, Daegu University, Gyeongsan 38453, Korea
a
ARTICLE HISTORY
ABSTRACT
Received 19 February 2020 Accepted 29 May 2020 Published Online 24 August 2020
This study examined the shear behavior of rock joints and proposed an analytical model for estimating the shear strength at rock joints. Numerous experimental tests indicated that the shear behavior at rock joint depends on many factors including the distribution of initial joint asperity, asperity angle and strength, applied normal stress, and progressive degradation of asperity. Nevertheless, most pre-existing strength models do not consider these features on shearing at rock joints enough. In this study an improved shear strength model, which can consider the complex joint shearing features observed from many experimental tests, was developed and proposed. The improved model considers the joint features more reliably and overcomes the limitations of the pre-existing strength models. The proposed model was compared with some experimental test results along with some pre-existing strength models. The comparison clearly indicated that the improved model can estimate the shear strength at rock joints more reliably than the pre-existing models. From the study results it is expected that a better estimate of joint shear strength could be obtained in the future for various rock, joint, stress, and shearing conditions.
KEYWORDS Rock joint Shear strength Strength model Joint degradation Stress concentration
1. Introduction The shear strength of rock joints plays the most important role when conducting stability analysis of slope, foundation, tunnel, and many other works in rock mass. Therefore, it is very important to understand the mechanism of the shear strength development at a rock joint and provide a reliable method to estimate the shear strength at joints. In general, the shear response at a rock joint shows very complex phenomena depending on rock properties, joint conditions, and in-situ stress conditions. When studying the shear strength of rock joints, the compressive strength of rock at the joint is one of most important factors to be considered. In addition, the geometrical condition of the joint affects the shear strength considerably and it should be taken into account carefully. Most important geometrical factors include the layout and inclination angle of joint asperities and their geometrical change during joint shearing. Though the geometrical characteristics of joint considerably influence the mechanical behavior of joint shear strength, they are very difficult to define in a simple way. In addition, the rock strength and in-situ stress conditions vary depending on the formation of rock, weathering, location, and so on. For estimating the shear strength at rock joints many remarkable
CORRESPONDENCE Moorak Son
[email protected]
ⓒ 2020 Korean S
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