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Development of a New Direct Shear Apparatus Considering the Boundary Conditions of Rock Joints  

이영휘 (영남대학교 공과대학 토목도시환경공학부)
김용준 (대림산업(주) 토목사업부)
Publication Information
Journal of the Korean Geotechnical Society / v.19, no.2, 2003 , pp. 147-157 More about this Journal
Abstract
The characteristics of a rock joint which influence the stability of rock mass structures such as cut slopes and tunnels are largely controlled by the conditions of the rock joint as well as its boundary conditions. The conditions of rock joints comprise asperity strength, roughness, and filling materials. Boundary conditions can be represented by assuming that the deformability(or stiffness) of the rock mass surrounding the joints is modelled by a spring with stiffness. A new direct shear apparatus was developed in this study, which adapts a servo control system using PID algorithm. This apparatus can be used to investigate the various aspects of shear characteristics of the rock joints at conditions of constant normal stress and constant normal stiffness and so on. The test results for saw-cut teeth joints show that shear strength should be evaluated by considering its specific boundary conditions far the design of tunnels and cut slopes.
Keywords
Boundary conditions; Constant normal stiffnes; Constant normal stress;
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