Shear strength behavior of compacted unsaturated residual soil

Marinho, Fernando A. M.; Oliveira, Orlando Martini de; Adem, Hana H.; Vanapalli, Sai K.

doi:10.1179/1938636212z.00000000011

Cited by 15 publications

(4 citation statements)

References 13 publications

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“…The third level takes into account the design curves obtained from laboratory tests performed with control suction and uncontrolled suction. Design curves provide valuable information based on the mechanical performance of the material because the mechanical performance of soils is measured in different conditions of water content and dry unit weight [17][18]. These three levels are considered independent, but as a group, they constitute a powerful tool in the design, study, quality control of compacted soils [12,[19][20], and other novel purposes as proposed by the present research (i.e.…”

Section: Introductionmentioning

confidence: 99%

Forensic Evaluation of Compacted Soils using RAMCODES

Oyola-Guzmán

Oyola-Morales

2018

CivileJournal

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Unexpected failure of compacted soils was explained using design curves of the Rational Methodology for Compacted Geomaterial’s Density and Strength Analysis (RAMCODES). Forensic geotechnical evaluation, applied to a compacted soil used at a construction site, demonstrated that the bearing capacity of the soil was influenced by the water content and the dry unit weight. At the construction site, the only criterion used for quality control of the compacted soil was the minimum compaction percentage; the maximum dry unit weight (achieved using the standard Proctor test) was used when the soil was compacted with light equipment, and the maximum dry unit weight (achieved using the modified Proctor test) was used when it was compacted with heavy equipment. After changing water content conditions, the soil compacted with heavy equipment and the soil compacted with light equipment exhibited changes in bearing capacity; the soil compacted with light equipment showed a failure, whereas the soil compacted with heavy equipment did not. The causes of failure were evaluated from samples of soil analyzed in the laboratory; analysis was performed using design curves obtained through a factorial experimental design. Our analysis revealed that the criterion of minimum compaction percentage was not adequate to determine the actual mechanical performance of the soil. We sought to determine why the soil compacted with light equipment did not satisfy the bearing capacity expected after compaction, and what other actions should performed at a construction site to avoid failure of soils compacted with light equipment.

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Section: Introductionmentioning

confidence: 99%

Forensic Evaluation of Compacted Soils using RAMCODES

Oyola-Guzmán

Oyola-Morales

2018

CivileJournal

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“…Due to world-wide distributions and extensively used as construction materials, many research worked have already been done on residual soils. For example, the engineering characteristics, microfabric and mineralogical composition, degree of weathering, compressibility and shear strength properties and their controlling factors, bonding behavior and its loading impact, stiffness or yielding behavior of both natural and compacted residual soils are examined by numerous scholars [1][2][3][4][5][6][7][8][9][10][11]. Several geo-engineering problems associated with residual soils such as landslides, subsidences, damage of road and railway tract, building collapse in many parts of the world have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Drying-Wetting Cycles on Saturated Shear Strength of Undisturbed Residual Soils

Hossain¹

2016

AJCE

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Due to worldwide distributions and extensively used as construction materials, geotechnical engineers are interested in understanding the mechanical behavior of residual soils which are sometimes referred in the literature as problematic soils. The climatic zones where residual soils occur are often experienced by many drying-wetting cycles due to seasonal variations. This seasonal variation in the water content termed as drying-wetting cycle is regarded as the most destructive environmental factor that may cause many foundation diseases. Considering these, the purpose of this study is to understand the effects of drying-wetting cycles on saturated shear strength characteristics of undisturbed residual soil. A series of consolidated drained (CD) triaxial tests are conducted on multiple drying-wetting soil specimens to analyze the saturated shear strength. The test results indicate that the stress-strain relationships appear to be strain-hardening. The deviatory stress and initial stiffness of saturated soils increase and the volume of soils becomes contractive as the net normal stress increases but decrease with increasing drying-wetting cycle numbers. The cohesion (c d) and internal friction angle (φ d) decrease with increasing cycle number (N) but the attenuation rate of φ d is less than c d. The variations of c d and φ d with respect to drying-wetting cycles can be expressed by exponential function. The saturated shear strength and it's attenuation rate due to drying-wetting cycles are analyzed. The effect is more significant for the first cycle and decreases with subsequent cycles and finally reaches to a constant state after 4 cycles. Furthermore, a mathematical function is proposed in this paper which can describe the saturated shear strength attenuation rate of drying-wetting cycle samples. Such studies are useful to understand the possible changes in shear strength behavior of residual soils below the engineering structures that are subject to periodic drying and wetting from climatic variations.

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“…Notwithstanding the challenges, tensiometers can be used to measure suction directly and results are obtained in a short time. For this reason, the use of HCT has been incorporated in equipment such as direct shear (Caruso and Tarantino 2004, Jotisankasa and Mairaing 2010, Shwan 2016, oedometer cells (Monroy et al 2007, Wijaya and Leong 2016a, Bagheri et al 2018, and triaxial cells (Meilani et al 2002, Muñoz-Castelblanco et al 2012, Marinho et al 2013.…”

Section: (D) High Capacity Tensiometersmentioning

confidence: 99%

Suction and strength of unsaturated soils

Bulolo¹

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Shear strength behavior of compacted unsaturated residual soil

Cited by 15 publications

References 13 publications

Forensic Evaluation of Compacted Soils using RAMCODES

Forensic Evaluation of Compacted Soils using RAMCODES

Effect of Drying-Wetting Cycles on Saturated Shear Strength of Undisturbed Residual Soils

Suction and strength of unsaturated soils

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