Suction Controlled Triaxial Apparatus for Saturated-Unsaturated Soil Test

Handoko, Luky; Yasufuku, Noriyuki; Oomine, Kiyoshi; Hazarika, Hemanta

doi:10.21660/2013.7.2147

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The determination of the shear strength parameters of unsaturated soil is very important to be used to solve geotechnical problems such as the slope stability analysis, designing retaining walls, soil excavation and embankment, and bearing capacity of shallow and deep foundation. The shear strength of unsaturated soil can be determined in a laboratory that applies a modified conventional direct shear device as described in [5],a suction controlled triaxial apparatus as described in [6], an unconfined compression test as described in [7], and unconsolidated undrained triaxial test as described in [8]. A direct measurement of the shear strength parameters of unsaturated soils is costly and time consuming, therefore, for practical purposes, the analysis is fairly based on the approximate soil properties [3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Matric Suction on the Shear Strength of Unsaturated Sandy Clay

Pujiastuti

Rifa

Adi

et al. 2018

GEOMATE

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The shear strength parameters of the soil is the key engineering property required for the design of geotechnical structures and stability analysis. The shear strength of an unsaturated soil is controlled by matric suction. This research examined the effect of matric suction on the shear strength behavior of sandy clay using a series of experimental tests in the laboratory. The contact filter paper method was used to measure matric suction and the SoilVision knowledge-based system was used to give an approximation of the entire soil water characteristic curve (SWCC). The shear strength of the unsaturated sandy clay was examined using a series of unconsolidated undrained (UU) triaxial tests to identify the relationship between shear strength, cohesion, internal friction angle, and matric suction. The result shows that the shear strength of the soil increases as matric suction increases. It was found that when the matric suction is smaller than air entry value (AEV), the shear strength of the soil increases as matric suction increases and the increment is linear because the soil is in saturated conditions. At a certain matric suction value (on soil samples occurred at 40-600 kPa matric suction values), there is a significant increase in the shear strength of soil associated with the inter-particle force produced due to negative pore water pressure. Furthermore, at a high matric suction, the relationship between shear strength and matric suction tend to be stable as in a low water content, the matric suction is not transmitted effectively to the contact point of soil particles.

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Section: Introductionmentioning

confidence: 99%

The Effect of Matric Suction on the Shear Strength of Unsaturated Sandy Clay

Pujiastuti

Rifa

Adi

et al. 2018

GEOMATE

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A Simplified Direct Shear Testing Procedure to Evaluate Unsaturated Shear Strength

Tang¹,

Borden

Gabr

2018

Geotechnical Testing Journal

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The work in this paper presents a simplified and expedient procedure to evaluate unsaturated shear strength using conventional direct shear testing with tensiometer-measured suctions. Two types of residual soils are utilized in this testing program. These are classified as elastic silt (MH) and silt (ML) and were obtained from a test site in Greensboro, North Carolina. Unsaturated triaxial tests were performed to provide reference values for comparison with the measured values from the proposed direct shear testing approach. Both single stage and multistage triaxial tests were performed, and an insignificant difference in the peak stress from both approaches was found. The total cohesion intercept was used to represent the strength contribution of the matric suction in order to normalize the effect of the confining pressure. The applicability of the simplified expedient procedure in assessing shear strength of residual soils used herein was demonstrated based on the total cohesion intercepts obtained from both testing approaches. The results from the proposed approach were very similar to those obtained from the unsaturated triaxial compression tests.

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Suction Controlled Triaxial Apparatus for Saturated-Unsaturated Soil Test

Cited by 2 publications

References 16 publications

The Effect of Matric Suction on the Shear Strength of Unsaturated Sandy Clay

The Effect of Matric Suction on the Shear Strength of Unsaturated Sandy Clay

A Simplified Direct Shear Testing Procedure to Evaluate Unsaturated Shear Strength

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