Tensile Strength of Compacted and Saturated Soils Using Newly Developed Tensile Strength Measuring Apparatus

Tamrakar, Surendra B.; Toyosawa, Yasuo; Mitachi, Toshiyuki; Itoh, Kazuya

doi:10.3208/sandf.45.103

Cited by 46 publications

(26 citation statements)

References 8 publications

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“…Jessberger (1980) presented typical shapes of specimens used for direct tensile test; we used that named "OFFENSEND" in this study (see Figure. 2). Tamrakar et al (2005) confirmed the good performance of this shape in the study of the tensile strength of unfrozen soil.…”

Section: Tensile Test Apparatussupporting

confidence: 69%

Tensile strength of frozen soil in the temperature range of the frozen fringe

Akagawa

Nishisato

2009

Cold Regions Science and Technology

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Frost heaving is a discontinuous phenomenon. It starts from rupture in the partially frozen soil called the frozen fringe and then segregation of an ice lens follows in the rupture. Macroscopically, the above-mentioned cycle repeats consistently as soil freezes. The rupture of the frozen fringe should govern the initial conditions of ice lens growth; however, it has not been studied so far. In this paper, the rupture is studied assuming that it has a close relationship with the tensile strength of the frozen fringe. The compressive strength of frozen soil was well-studied in the last century. However, the tensile strength of frozen soil in frozen fringe temperature is discussed along with the unfrozen water content of Dotan and ice tensile strength, and a simplified soil structure model. The tensile strength of the frozen fringe seems to be primarily due to the tensile strength of the pore ice framework.

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Section: Tensile Test Apparatussupporting

confidence: 69%

Tensile strength of frozen soil in the temperature range of the frozen fringe

Akagawa

Nishisato

2009

Cold Regions Science and Technology

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“…Several designs of jaws/platens have been proposed by previous authors including internally or externally glued fixings (Heibrock et al, 2005) and friction based designs such as truncated cylinders (Tamrakar et al, 2005) and truncated triangular prisms (Rodriguez, 2002;Kim and Hwang 2003;Trabelsi et al, 2012). In order to induce tension, a pair of loading jaws was designed between which the soil specimen is mounted.…”

Section: Direct Tensile Testingmentioning

confidence: 99%

“…compression) such that the specimen fails in tension. Direct tests include modification of triaxial testing apparatus (Tang and Graham, 2000;Heibrock et al,2005;Zeh and Witt, 2007) and modification of direct shear testing apparatus (Nahlawi et al, 2004;Tamrakar et al, 2005;Trabelsi et al, 2012). Indirect tests include the Brazilian tensile test (Frydman, 1964;Krishnayya and Einsenstein, 1974), Hollow Cylinder Triaxial test (Alsayed, 2002) and beam bending (Thusyanthan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Stirling

Hughes

Davie

et al. 2015

Applied Clay Science

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThis paper presents a new method for testing the behaviour of soils placed under tensile load and demonstrates its suitability for testing a number of soil types under various conditions including saturation, compaction and stabilisation. Validation of the results obtained for the soils at relatively low saturation has been conducted using the established Brazilian (indirect) test for measuring the tensile strength of brittle materials. A fair comparison has been found and the results highlight the limited applicability of the Brazilian method to soils at very low water contents at which the tensile failure criterion has been assumed using this methodology. Optical characterisation of the performance of both testing methods has also been conducted using Digital Image Correlation. The consistent, accurate measurement of directly induced tensile strains using the proposed new method has been confirmed, verifying its capability to apply a direct tensile stress in the absence of shearing, a problem commonly associated with other tensile testing methods. The developed technique has then been used to investigate the water content -tensile strength relationship for compacted, unsaturated soils and offers significant advantages in the characterisation of clay soils subjected to variable climatic loading.

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“…Very few researches (e.g., Suzuki et al, 1998;Yao et al, 2002;Ono et al, 2003) have been made to measure the tensile strength of soils having lower tensile values. Recently, Nahlawi et al (2004) and Tamrakar et al (2005a) have introduced a new tensile strength measuring apparatus which measures the tensile strength directly. One developed by Nahlawi et al (2004) could be mainly used for compacted clayey and stiŠ soils only whereas the one developed by Tamrakar et al (2005a) seems to be easy to use and simple to handle and could be used for both compacted unsaturated and highly saturated soils.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Soil Tensile Strength and Factors Affecting its Measurements

Tamrakar

Mitachi

Toyosawa

2007

Soils and Foundations

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This paper describes the tensile strength measured for three kinds of statically compacted unsaturated soils; mixtures of clay¿silt¿sand, Narita-sand and Kanto loam. Specimens were directly prepared either under controlled compaction stress or under controlled dry density by statically compacting them within the tensile mold of the apparatus. Image analysis was done to show the normality of tensile force to the tensile failure plane. Tensile strengths (qt) were compared with the unconˆned compressive strengths (qu) for silt¿sand mixture, clay¿sand mixture, clay¿silt mixture and Narita sand, respectively. Increment in tensile strength (also qu W qt ratio) with the increase in the percentage and decrease in the size ofˆner soils could be seen. EŠects of number of compaction layers and tensile pulling rates on the q t were also examined. Increase in the tensile strength with the increase in the number of compaction layers was observed; and it was suggested to prepare the unsaturated compacted specimen by 3 to 4 layers compaction. Increase in tensile strength of 0.3 kPa and 0.003 kPa per one cycle of logarithm of tensile pulling rate was observed for clay¿sand-4 (1:3) and clay¿sand-5 (3:1) for the pulling rate of 0.01 to 1.0 mm W min.

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Tensile Strength of Compacted and Saturated Soils Using Newly Developed Tensile Strength Measuring Apparatus

Cited by 46 publications

References 8 publications

Tensile strength of frozen soil in the temperature range of the frozen fringe

Tensile strength of frozen soil in the temperature range of the frozen fringe

Tensile behaviour of unsaturated compacted clay soils — A direct assessment method

Measurement of Soil Tensile Strength and Factors Affecting its Measurements

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