Drainage and Shear Velocity Dependent Shear Characteristics of Abandoned Imgi Mine Waste Materials in Ring Shear Tests

2017 ◽  
pp. 337-341
Author(s):  
Sueng-Won Jeong ◽  
Sung-Sik Park ◽  
Hiroshi Fukuoka ◽  
Sang-Woo Ji ◽  
Choon-Oh Lee
Keyword(s):  
Mine Waste ◽  
Shear Velocity ◽  
Waste Materials ◽  
Shear Tests ◽  
Ring Shear ◽  
Ring Shear Tests ◽  
Shear Characteristics

scholarly journals Effect of the Surface Roughness on the Shear Strength of Granular Materials in Ring Shear Tests

2019 ◽  
Vol 9 (15) ◽  
pp. 2977 ◽  
Author(s):  
Sueng-Won Jeong ◽  
Sung-Sik Park
Keyword(s):  
Surface Roughness ◽  
Shear Strength ◽  
Granular Materials ◽  
Rough Surfaces ◽  
Shear Velocity ◽  
Shear Tests ◽  
Ring Shear ◽  
Ring Shear Tests ◽  
Undrained Conditions ◽  
Drained And Undrained Conditions

Surface roughness plays an important role in estimating the shear strength of granular materials. A series of ring shear tests with different surface roughnesses (i.e., smooth and rough surfaces) were performed. A large-sized ring shear device, which is applicable for fine- and coarse-grained sediments, was developed to examine the shear strength of large particle sizes (i.e., commercial gravels with a mean grain size of 6 mm). In terms of surface roughness, the drainage- and shear-velocity-dependent shear strengths of the granular materials were examined. In this study, different shear velocities of 0.1, 0.5, and 1 mm/s were applied under drained and undrained conditions. The test results clearly show that shear stress is affected by drainage, shear velocity, and surface roughness. In particular, a typical strain-hardening behavior is exhibited regardless of the drainage and shear velocity condition. The measured shear strength obtained from both drained and undrained conditions increased with increasing shear velocity. All tests showed a large fragmentation using rough surfaces compared to the smooth surfaces of the device. The grain crushing was significant during shearing, even when normal stress was not applied. For a given shear velocity, surface roughness is an important feature in determining the shear strength of granular materials.

scholarly journals Modeling Granular Crushing in Ring Shear Tests: Experimental and Numerical Analyses

2006 ◽  
Vol 46 (2) ◽  
pp. 147-157 ◽  
Author(s):  
Sebastian Lobo-Guerrero ◽  
Luise Vallejo
Keyword(s):  
Numerical Analyses ◽  
Shear Tests ◽  
Ring Shear ◽  
Ring Shear Tests

Trigger mechanism of loess-mudstone landslides inferred from ring shear tests and numerical simulation

2021 ◽  
Vol 18 (9) ◽  
pp. 2412-2426
Author(s):  
Xin-gang Wang ◽  
Bao-qin Lian ◽  
Liu Kai ◽  
Luo Li
Keyword(s):  
Numerical Simulation ◽  
Shear Tests ◽  
Trigger Mechanism ◽  
Ring Shear ◽  
Ring Shear Tests

scholarly journals Application of large-scale ring shear tests to the analysis of tsunamigenic landslides at the Stromboli volcano, Italy

Landslides ◽  
2009 ◽  
Vol 6 (3) ◽  
pp. 231-240 ◽  
Author(s):  
Daniela Boldini ◽  
Fawu Wang ◽  
Kyoji Sassa ◽  
Paolo Tommasi
Keyword(s):  
Large Scale ◽  
Stromboli Volcano ◽  
Shear Tests ◽  
Ring Shear ◽  
Ring Shear Tests

scholarly journals Consolidated and Undrained Ring Shear Tests on the Sliding Surface of the Hsien-du-shan Landslide in Taiwan

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Hung-Ming Lin ◽  
Jian-Hong Wu ◽  
Erik Sunarya
Keyword(s):  
Pore Pressure ◽  
Rock Avalanche ◽  
Excess Pore Pressure ◽  
High Water Content ◽  
Sliding Surface ◽  
Shear Tests ◽  
Typhoon Morakot ◽  
Ring Shear ◽  
Ring Shear Tests ◽  
Excess Pore

A new consolidated undrained ring shear test capable of measuring the pore pressures is presented to investigate the initiation mechanism of the Hsien-du-shan rock avalanche, triggered by Typhoon Morakot, in southern Taiwan. The postpeak state of the landslide surface between the Tangenshan sandstone and the remolded landslide gouge is discussed to address the unstable geomorphological precursors observed before the landslide occurred. Experimental results show that the internal friction angle of the high water content sliding surface in the total stress state, between 25.3 and 26.1°, clarifies the reason of the stable slope prior to Typhoon Morakot. In addition, during the ring shear tests, it is observed that the excess pore pressure is generated by the shear contractions of the sliding surface. The remolded landslide gouge, sheared under the high normal stress, rendered results associated with high shear strength, small shear contraction, low hydraulic conductivity, and continuous excess pore pressure. The excess pore pressure feedback at the sliding surface may have accelerated the landslide.

Seismic triggering of catastrophic failures on shear surfaces in saturated cohesionless soils

2005 ◽  
Vol 42 (1) ◽  
pp. 229-251 ◽  
Author(s):  
Aurelian Catalin Trandafir ◽  
Kyoji Sassa
Keyword(s):  
Shear Stress ◽  
Shear Resistance ◽  
Shear Displacement ◽  
Sliding Surface ◽  
Shear Tests ◽  
Shear Surface ◽  
Ring Shear ◽  
Ring Shear Tests ◽  
Stress Reversals ◽  
Undrained Shear

This paper is concerned with an analysis of the seismic performance of infinite slopes in undrained conditions. The material assumed on the sliding surface is a loose saturated sand susceptible to a gradual loss in undrained shear strength after failure with the progress of unidirectional shear displacement. The undrained monotonic and cyclic shear behavior of this sand was investigated through an experimental study based on ring shear tests, with initial stresses corresponding to the static conditions on the sliding surface of the analyzed slopes. These tests provide the experimental framework for a modified sliding block method to estimate the earthquake-induced undrained shear displacements for conditions of no shear stress reversals on the sliding surface. The proposed estimation procedure incorporates the shearing resistance obtained from undrained monotonic ring shear tests to approximate the undrained yield resistance at a certain displacement during an earthquake. The term catastrophic failure is used in this study to define the accelerated motion of a potential sliding soil mass due to the static driving shear stress exceeding the reduced undrained yield resistance of the soil on the shear surface. The critical displacement necessary to trigger a catastrophic failure on the shear surface under seismic conditions was derived based on the shear resistance – shear displacement curve obtained under monotonic loading conditions. Using the shear resistance – shear displacement data from undrained monotonic ring shear tests and several processed horizontal earthquake accelerograms, the minimum peak earthquake acceleration necessary to cause a catastrophic shear failure under various seismic waveforms was estimated for conditions of no shear stress reversals on the sliding surface.Key words: earthquakes, slopes, critical shear displacement, sand, ring shear tests, undrained shear strength.

Sign in / Sign up

Export Citation Format

Share Document