Stiffness and strength parameters for hardening soil model of soft and stiff Bangkok clays

Surarak, Chanaton; Likitlersuang, Suched; Wanatowski, Dariusz; Balasubramaniam, A. S.; Oh, Erwin; Guan, Hong

doi:10.1016/j.sandf.2012.07.009

Cited by 202 publications

(79 citation statements)

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“…Post peak behavior of tailings shows crushing or sliding of particles. Consequently, stiffness of tailings was reduced [33].The HSM slightly overestimated stiffness at small strains and underestimated stiffness at larger strains (Fig 9). However, underestimated values of stiffness could predict exaggerated deformations which might give an early warning before occurrence of true failure of a tailing dam.…”

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confidence: 89%

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Mechanical properties of soft tailings from different depths of a Swedish tailings dam: Results from triaxial tests

et al. 2018

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In an upstream tailings dam, loose layers might occur at different depths due to melting of frozen layers deposited during freezing temperature in Sweden. Reduced shear strength of such layers in a tailings dam might cause stability problems. Due to slow consolidation process, it is unknown, whether self-weight of a high tailings dam could have influence on strength and stiffness of soft tailings located at different depths. For numerical modelling, appropriate strength and stiffness properties of soft tailings are needed. For this purpose, loose layers in an upstream tailings dam were identified based on results of cone penetration tests.Consolidated Drained (CD) triaxial tests were conducted on undisturbed soft tailings collected from different depths of the dam. The results indicated that depth did not have considerable influence on strength and stiffness of tailings. Hardening Soil Model (HSM), at high confining pressures and axial strains underestimated stiffness of soft tailings under CD triaxial state. This study shows that: (i) proper care is needed in evaluating strength and stiffness parameters for soft tailings, and (ii) use of the HSM is likely to predict more deformations which could give an early warning before an actual failure of a tailings dam.Keywords: Soft tailings; Stress-strain behavior; Triaxial tests, Hardening Soil Model, strength and stiffness. IntroductionTailings dams may be constructed using three methods such as: upstream, downstream and centerline [1]. Tailings dams raised using upstream construction method are relatively economical as compared to ones constructed with other two methods [1]. It is generally understood that soil becomes stronger in deep layers as compared to the surface. This implies that lower layers in an embankment dam might be stronger than those at the top. This is because the strength is dependent on the confining pressure coming from the layers above. Materials StudiedThe undisturbed samples of tailings were collected from various locations of Aitik tailings dam. Void ratio and bulk density of tailings obtained from various depths are shown in Table 1. Samples were collected from those layers of the dam which were described as loose according to CPT results. Particle size distribution curves conducted by [6] showed that the tailings particles at shallow depth were more angular than those obtained from deeper depths.All samples were fully saturated having water content from 15 to 44%. The average specific gravity and bulk density of the studied tailings were 2.83 and 1.73-1.98 t/m 3 , respectively.Place Table 1 here.All tests were subject to axial strain rate of 5 × 10 −3 mm/min. The axial strains were measured indirectly by volume changes in lower chamber, and radial strains were calculated from changes in specimen height and volume. Similarly, volumetric strains were calculated from changes in back volume of specimen by measuring amount of water coming into or going out of specimen and initial sample dimensions. The axial deformations in the test s...

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confidence: 89%

“…Evaluation procedure of parameters of the HSM [33] is described in Table 3. The parameters of HSM were evaluated based upon the drained triaxial tests and standard oedometer tests conducted on tailings material.…”

Section: Hardening Soil Model Parametersmentioning

confidence: 99%

Mechanical properties of soft tailings from different depths of a Swedish tailings dam: Results from triaxial tests

et al. 2018

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“…LVDT was employed by Gasparre et al (2007) in determining the stiffness of natural London clay. Other research conducted with LVDTs include; (Atkinson, 2000;Cabarkapa and Cuccovillo, 2006;Yimsiri et al, 2009;Jung et al, 2012;Surarak et al, 2012;Likitlersuan et al, 2013;Ratananikom et al, 2013;Gasparre et al, 2014;Nishimura, 2014;Shankar Kumar et al, 2016;Roshan et al, 2017;Wild et al, 2017).…”

Section: Linear Differential Variable Transducer (Lvdt)mentioning

confidence: 99%

“…It was then adopted by Yimsiri and Soga (2011) and Surarak et al (2012). The resolution can be measured up to 0.00024%.…”

Section: Distributed Fibre Optic Strain Sensor (Conjuncture Helical Cmentioning

confidence: 99%

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Isah¹,

Civil²,

Mohamad³

et al. 2018

Int. j. adv. appl. sci.

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Accurate determination of soil stiffness at small strain (0.001 % -0.1 % strain) is very important as it portrayed the stiffness of soil underneath geotechnical structures. To evaluate stiffness at small strain, it is important to achieve a minimum strain measurement accuracy of 10-4 %, this is attained using transducers, strain gauges and sensors which are attached on the specimen locally inside the triaxial cell. Several local strains measuring techniques have emerged with the intention of developing a seamless system which is easy, accurate and less expensive. This study epitomizes the existing types of small strain measuring instrumentation, their trend of development and technology. Those that can measure both axial and radial strain, axial strain alone and radial strain alone are distinguished and described. Also, the accuracy, features, merits, and demerits of each type of device have been discussed accordingly. This paper provides information that enables selection of a suitable device that will best fit a particular application. It is anticipated that the study will inspire further researches in the area.

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“…Zemin profilinde yeraltı su seviyesi zemin üst yüzeyindedir. Temel zemininin dayanım ve rijitlik özelliklerinin belirlenmesinde, [8,12] …”

Section: Temel Zemini Profili Geometrik Ve Geoteknik öZellikleriunclassified

Dolgu-Zemin Etkileşiminde Malzeme Modeli Etkisi

Arama¹,

Cinicioglu²

2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetKentleşme ve ulaşım sistemlerini oluşturan barajlar, limanlar, otoyol ve köprü yaklaşım dolguları gibi önemli inşaat mühendisliği uygulamalarının yumuşak temel zeminleri üzerine de yapılması gerekli olmaktadır. Temel zemini içinde yumuşak zeminler tek tabaka halinde veya tabakalanmış zemin profili içinde farklı kalınlıklarda bulunabilmektedirler. Bu makalede, farklı rijitlikteki ve kalınlıklardaki tabakalardan oluşan temel zemini profillerinin değişken geometrik özelliklere ve mukavemet parametrelerine sahip dolgularla birlikte davranışı, beş değişik malzeme modeliyle yapılan analizlerin sonuçları ışığında parametrik olarak incelenmiştir. Sonuçların uygulamacılara dolgu-zemin etkileşiminin önemli davranış bileşenlerini değerlendirmek bakımından yararlı bilgiler sunacak nitelikte olduğu düşünülmektedir.Anahtar Kelimeler: Dolgu, Tabakalanma, Kritik yükseklik, Malzeme modelleri, Zemin-yapı etkileşimi. Material Model Effects on Embankment-Soil Interaction AbstractEmbankment construction over soft foundation soils is usually required as part of the infrastructure projects such as dams, ports and harbours, highways and bridge abutments. Soft foundation soils may be encountered as thick deposits or as a layer of a stratified foundation system. In this paper, the problem of embankment construction on stratified soils consisting of a soft layer either at the top, just beneath the embankment loads or at the bottom beneath a stiffer soil stratum underlying the embankment were analysed. Many variables were considered in the parametrical analyses such as varying soil thicknesses, different sequences of layering, different embankment geometries. A large number of analyses were conducted by using five types of material models to find the main features of embankment-foundation interactive behaviour on the stratified soils and the role of adopted material models on the results.

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Stiffness and strength parameters for hardening soil model of soft and stiff Bangkok clays

Cited by 202 publications

References 10 publications

Mechanical properties of soft tailings from different depths of a Swedish tailings dam: Results from triaxial tests

Mechanical properties of soft tailings from different depths of a Swedish tailings dam: Results from triaxial tests

Measurement of small-strain stiffness of soil in a triaxial setup: Review of local instrumentation

Dolgu-Zemin Etkileşiminde Malzeme Modeli Etkisi

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