Variation of collapse potential and stiffness degradation with matric suction of compacted unsaturated cohesive soil

Pandya, Saloni; Sachan, Ajanta

doi:10.1080/19386362.2017.1398368

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Taking the matric suction as 200 kPa as the demarcation point, the shear strength in the main transition zone increases rapidly with the matric suction comparing with the secondary transition zone. This is similar to the results of Çokça and Tilgen [44], Bai and Liu [45], Pandya et al [13], and Khalili et al [22].…”

Section: Relationship Between Shear Strength and Matricsupporting

confidence: 92%

“…Until later, with the development of the mechanics of unsaturated soil, many scholars have done a lot of research on the relationship between the shear strength of unsaturated soil and matric suction [13][14][15][16][17][18]. Idinger and Wu [19] showed that the matric suction reduced the shrinkage effect of granular soil and increased the total cohesion, while the effective angle of internal friction did not change too much; Rasool and Kuwano [20] studied the influence of matric suction on the shear strength of unsaturated silty soil, and they found the relationship between matric suction and shear strength was nonlinear; Pujiastuti et al [21] pointed out that the total cohesion and effective angle of internal friction of unsaturated sand will increase with the increase of matric suction, but the shear strength increase a little.…”

Section: Introductionmentioning

confidence: 99%

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Study on Water Characteristic Curve and Shear Characteristics of Typical Unsaturated Silty Clay in Shaoxing

Tang

et al. 2021

Geofluids

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In order to probe into one simplified method to predict the shear strength of Shaoxing unsaturated silty clay, the test method combining unsaturated soil consolidation instrument and conventional direct shear instrument is used to study the shear strength, and the method is compared and verified with the results of equal suction direct shear test. The research results show that the soil water characteristic curve fitted by the measured data points and VG model has obvious stage characteristics in the range of 0~38 kPa, 38~910 kPa, and 910~10000 kPa. The shear strength of unsaturated soil measured by consolidation meter combined with conventional direct shear test is in good agreement with that measured by equal suction direct shear test in the range of 0~500 kPa. The results show that the shear strength, total cohesion, and effective internal friction angle of soil increase slightly with the increase of matric suction in the range of 0~38 kPa. When the matric suction increases from 38 kPa to 500 kPa, the shear strength and total cohesion force of the soil have similar stage characteristics with the SWCC, which first increases and then tends to be stable, while the effective internal friction angle changes slightly. Finally, taking the air-entry value as the demarcation point, an improved model of unsaturated shear strength is proposed by analyzing the error value. Compared with the measured value, the absolute value of relative error is basically kept in the range of 5%~10%, which is close to the measured value.

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Section: Relationship Between Shear Strength and Matricsupporting

confidence: 92%