Influence of effective normal stress in the measurement of fully softened strength in different origin landslide soils

Kimura, Sho; Nakamura, Shuichi; Vithana, Shriwantha Buddhi

doi:10.1016/j.still.2014.07.018

Cited by 20 publications

(5 citation statements)

References 20 publications

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“…Figures 3a, 4a and 5a show the typical shear characteristics of the slip-zone soils (shearing rate 0.1 mm/min and 1 mm/min) obtained from three different locations, where, the shear stress is plotted against the shear displacement at the normal stress ranged from 100kN/m 2 to 400kN/m 2 . It is a widely accepted fact that normal stress has effect on the shear behavior of the soil (Kimura et al, 2015;Stark Timothy et al, 2005;Eid, 2014), thus, the shear behavior of samples at the peak and residual stages, where, the determined peak friction coefficient as well as residual friction coefficient are plotted in Figure 3b, 4b, and 5b against the corresponding effective normal stresses. The friction coefficient is defined as the shear stress divided by the effective normal stress.…”

Section: Shear Behaviormentioning

confidence: 99%

“…It is a generally accepted fact that the measurement of the residual strength is most preferred done with a ring shear test since it allows the soil specimen be sheared at unlimited displacement which can simulate the field conditions more accurately (Lupini et al, 1981;Tiwari and Marui, 2005;Bhat, 2013;Sassa et al, 2004). Until now, several relationships between the residual strength and soil index parameters have been reported in the literature with a wide range of soil by using various kinds of ring shear apparatus (Hoyos et al, 2014;Jiang et al, 2016;Kimura et al, 2015;Li et al, 2013;. Furthermore, many studies have shown that the shearing rate may or may not affect the minimum value of soil strength at residual states (Suzuki et al, 2007;Grelle and Guadagno, 2010;Gonghui et al, 2010;Bhat, 2013;Tika and Hutchinson, 1999;Lemos, 1985;Morgenstern and Hungr, 1984;Tika, 1999).…”

Section: ． Introductionmentioning

confidence: 99%

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Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

Lian

Peng

Wang

et al. 2018

Preprint

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Abstract. In order to investigate the effect of the shearing rate on the residual shear strength of slip zone soils, a series ring shear tests were carried out on slip zone soils from three landslides in loess area at the two shearing rates (0.1 mm/min and 1 mm/min). The slip zone soil specimens used in present study were from the northwest of China. Results indicated that the shear displacement to achieve the residual stage for specimens with higher shearing rate is greater than that of the lower rate. Relationship between the residual friction coefficients and normal stress shows that the residual friction coefficients for all specimens under the lower normal stress were greater than that under the higher normal stress at two shearing rate. Furthermore, the difference in the residual friction angle фr at the two shearing rates, фr (1) − фr (0.1), under each normal stress level were either positive or negative values, with the maximum absolute value of фr (1) − фr (0.1) reach up to 2.218°. However, the difference фr (1) − фr (0.1) under all normal stresses was negative, which indicates that the residual shear parameters reduced with the increasing of the shearing rate in loess area.

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Section: Shear Behaviormentioning

confidence: 99%

Section: ． Introductionmentioning

confidence: 99%

Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

Lian

Peng

Wang

et al. 2018

Preprint

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“…3(a)-5(a) show the typical shear characteristics of the loess (shear rate of 0.1 mm/min and 1 mm/min) obtained from three different locations, where, the shear stress is plotted against the shear displacement. It is a widely accepted fact that normal stress has effect on the shear behavior of the soil (Stark Timothy et al, 2005;Eid, 2014;Kimura et al, 2015;Wang et al, 2019), thus, the shear behavior of 3(b)), respectively, which is greater than in the Ydg samples (about 9.8% and 10.3% and 6.0% ( Fig. 5(b)).…”

Section: Resultsmentioning

confidence: 90%

Shear rate effect on the residual strength characteristics of saturated loess

Lian

Peng

Huang

2019

Preprint

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Abstract. Residual shear strength of soils is an important soil parameter for assessing the stability of landslides. To investigate the effect of the shear rate on the residual shear strength of loessic soils, a series of ring shear tests were carried out on loess from three landslides at two shear rates (0.1 mm/min and 1 mm/min). Naturally drained ring shear tests results showed that the shear displacement to achieve the residual stage for specimens with higher shear rate was greater than that of the lower rate; both the peak and residual friction coefficient became smaller with increase of shear rate for each sample; at two shear rates, the residual friction coefficients for all specimens under the lower normal stress were greater than that under the higher normal stress. The tests results revealed that the difference in the residual friction angle фr at the two shear rates, фr (1)–фr (0.1), under each normal stress level were either positive or negative values. However, the difference фr(1)–фr (0.1) under all normal stresses was negative, which indicates that the residual shear parameters reduced with the increasing of the shear rate in loess area. Such negative shear rate effect on loess could be attributed to a greater ability of clay particles in specimen to restore broken bonds at low shear rates.

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“…To analyze the specificity of fault gouge mechanical properties, the residual strengths of clay and loess are selected from references to give a comparison [35,[37][38][39][40][41][42][43]. e fitting curves of "shear stress ratio (R s )" and normal stress (0 to 600 kPa) of different soils are obtained as shown in Figure 16.…”

Section: Comparison Of Residual Strength Of Different Soilsmentioning

confidence: 99%

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

Bao

Lan

et al. 2019

Advances in Civil Engineering

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Fault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength properties of the differently colored remolded fault gouges of the Shendaogou Fault in Yan’an were studied by changing moisture contents and normal stresses. Chlorite and illite are the main clay minerals in fault gouges; differences in mineral composition make fault gouges appear in different colors. Besides clay minerals, the dried fault gouges disintegration in water is also due to the transformation of gypsum. The gradation of green fault gouge and multicolor fault gouge is better than that of the red fault gouge, while the fault gouges’ strain softening properties become weaker as the coarse grain content increases. Affected by water content and normal stress, the shear planes can be divided into three failure modes: peeling failure, grooved failure, and sliding failure. With the increase of water content, there will be a significant weakening on cohesion and friction angle. A new parameter, the “Normal Stress Threshold (NST),” is introduced as a critical value for the emergence of the strain hardening phenomenon, and the NSTs of different fault gouges are significantly different. The functions obtained from the relation of residual strength, peak strength, and normal stress can be used to calculate shear strength parameters under any normal stresses. In addition, the residual strength of fault gouge is obviously different from clay and loess, which can be qualitatively explained by clay particle contents.

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Influence of effective normal stress in the measurement of fully softened strength in different origin landslide soils

Cited by 20 publications

References 20 publications

Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

Shear rate effect on the residual strength characteristics of saturated loess

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

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