Ring Shear Characteristics of Waste Rock Materials in Terms of Water Leakage

Abstract

주요어: 링전단시험장치, 비배수전단강도, 누수, 변형률 경화 거동, 변형률 연화 거동Shear characteristics of soils can be investigated using various types of shear stress measuring apparatus. Ring shear tests are often applied for examining the residual shear strength under the unlimited deformation. This paper presents drainage-consolidation-shear velocity dependent undrained shear strengths measured in terms of water leakage. A series of ring shear tests were performed under the constant normal stress (50 kPa) and controled shear velocity ranging from 0.01~1 mm/sec under the undrained condition. As a result, undrained shear strengths are dependent on shear velocity. It exhibits that straining hardening behavior is observed for the shear velocity lower than 0.1 mm/sec; however, the strain softening behavior is observed for the shear velocity higher than 0.1 mm/sec. Water leakage can cause the increase in shear stress irrespective of shear velocity. Shear stress increases with increasing amount of water leakage. It is due to the fact that the small grains and water flow out through the rubble edge in the ring shear box. Repetitive saturation and consolidation processes may minimize the error.

Analysis of Residual Shear Strength Characteristics for Fine Content Using Ring Shear Test Apparatus

“…경화 및 연화거동은 전단 속도에 의해 영향을 받는다. 예를들어, 수중 자갈 및 모래와 자갈을 혼합한 시료의 경우 낮은 전단 속도에서 경화 거동을 보이고, 높은 전단 속도에서 연화 거동을 나타냈다 (Jeong, 2016;Kim et al, 2021). 전단상자 상하부에 동일의 재료가 사용될 경우, 전단응력은 수직응력과 함께 증가하나, 이질의 재료는 수직응력에 상관 없이 일정안 전단응력을 나타낸다 (Park et al, 2013).…”