Correlation of large displacement drained shear strength of landslide soils measured by direct shear and ring shear devices

Vithana, Shriwantha Buddhi; Nakamura, Shuichi; Gibo, Seiichi; Yoshinaga, Anshun; Kimura, Sho

doi:10.1007/s10346-011-0301-9

Cited by 29 publications

(10 citation statements)

References 38 publications

(63 reference statements)

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“…The shear tests were performed with an IC‐type (Bishop et al, ) servo‐hydraulic computerized ring‐shear device under displacement rates 0.002 ≤ v ≤ 120 mm/min (3.33 × 10 −8 ≤ v ≤ 2 × 10 −3 m/s) and normal stresses of 150 ≤ σ n ≤ 1,500 kPa. The samples were first slow‐sheared to obtain a drained residual condition (American Society for Testing and Materials (ASTM), ; Skempton, ; Vithana et al, ). Then, the velocity was increased step‐by‐step to 120 mm/min.…”

Section: Methodsmentioning

confidence: 99%

Shear‐Rate‐Dependent Behavior of Clayey Bimaterial Interfaces at Landslide Stress Levels

Scaringi

et al. 2018

Geophysical Research Letters

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The behavior of reactivated and first‐failure landslides after large displacements is controlled by the available shear resistance in a shear zone and/or along slip surfaces, such as a soil‐bedrock interface. Among the factors influencing the resistance parameter, the dependence on the shear rate can trigger catastrophic evolution (rate‐weakening) or exert a slow‐down feedback (rate‐strengthening) upon stress perturbation. We present ring‐shear test results, performed under various normal stresses and shear rates, on clayey soils from a landslide shear zone, on its parent lithology and other lithologies, and on clay‐rock interface samples. We find that depending on the materials in contact, the normal stress, and the stress history, the shear‐rate‐dependent behaviors differ. We discuss possible models and underlying mechanisms for the time‐dependent behavior of landslides in clay soils.

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Section: Methodsmentioning

confidence: 99%

Shear‐Rate‐Dependent Behavior of Clayey Bimaterial Interfaces at Landslide Stress Levels

Scaringi

et al. 2018

Geophysical Research Letters

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“…Regarding the indoor shear tests for rocks and soils, there have been many results for references [6,16,17]. Herein, we performed direct shear tests on soil specimens under repeated wetting-drying condition.…”

Section: Direct Shear Test Under the Wetting-drying Cyclesmentioning

confidence: 99%

Material Weakening of Slip Zone Soils Induced by Water Level Fluctuation in the Ancient Landslides of Three Gorges Reservoir

Jiao

Song

Tang

et al. 2014

Advances in Materials Science and Engineering

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This experimental study investigated the effect of repeated wetting and drying on the reduction of slip zone soils taken from the Huangtupo landslide in the Three Gorges Reservoir, China. The variation process of the physical property and substance composition of the slip zone soils under the wetting-drying cycles was studied through liquid and plastic limit test and X-ray diffraction test. The results indicate that (1) the shearing strength of the slip zone soil dramatically decreased after one wettingdrying cycle and then gradually decreased until reaching a relatively stable state at the fourth cycle; (2) the plasticity index of the slip zone soil varied with increasing number of cycles and a variation process opposite to that of the strength value was observed; and (3) the clay mineral content in the slip zone soil increased and the calcite and quartz contents relatively decreased with increasing number of cycles. The variations in the plasticity index of the slip zone soil, as well as the increase in its clay mineral content, play important roles in the strength reduction. The results of this study provide a foundation for revealing the deformation and damage mechanism of landslides in reservoir banks.

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“…At present, the research methods of the shear mechanical properties of the slip zone soil are mainly indoor tests, including the direct shear test, ring shear test, and triaxial test in the laboratory. The direct shear test is widely used in obtaining the strength parameters of soil because of its convenience and quickness, and a lot of experience has been accumulated in engineering [ 8 , 9 , 10 ]. Landslides usually experience a process of large deformation [ 11 ]; however, the large shear displacement of the slip zone soil cannot be implemented in the direct shear test, and the ring shear test was thereby developed to study the shear mechanical properties of the slip zone soil with large displacement [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil

Zou

Zhang

Xiong

et al. 2020

Sensors

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Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deformation process of the gravelly slip zone soil includes an elastic deformation stage, elastic–plastic deformation stage, and plastic deformation stage. Four functions were introduced to express the shear constitutive model of the gravelly slip zone soil, and the asymmetric sigmoid function was demonstrated to be the optimum one to describe the relationship of the shear stress and shear displacement with a correlation coefficient of 0.986. The comparison between the in situ test and indoor direct shear test indicates that gravels increase the strength of the slip zone soil. Therefore, the shear strength parameters of the gravelly slip zone soil obtained by the in situ test are more preferable for evaluating the stability of the landslide and designing the anti-slide structures.

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Correlation of large displacement drained shear strength of landslide soils measured by direct shear and ring shear devices

Cited by 29 publications

References 38 publications

Shear‐Rate‐Dependent Behavior of Clayey Bimaterial Interfaces at Landslide Stress Levels

Shear‐Rate‐Dependent Behavior of Clayey Bimaterial Interfaces at Landslide Stress Levels

Material Weakening of Slip Zone Soils Induced by Water Level Fluctuation in the Ancient Landslides of Three Gorges Reservoir

In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil

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