Testing and Modeling Two Rockfill Materials

Varadarajan, A.; Sharma, Kalpana; Venkatachalam, K; Gupta, Abir

doi:10.1061/(asce)1090-0241(2003)129:3(206)

Cited by 274 publications

(121 citation statements)

References 12 publications

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“…Three types of ballast, three types of rockfill materials giving a total of 23 independent sets of data were adopted (Varadarajan et al 2003;Chavez and Alonso 2003;Indraratna et al 1998Salim and Indraratna 2004;Suiker et al 2005;Anderson and Fair 2008;Aursudkij et al 2009). The parameters used for the model are shown in Table 2.…”

Section: Model Validationmentioning

confidence: 99%

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Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

2015

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A substantial amount of experimental evidence suggests that the critical state envelope for ballast is nonlinear, especially at low confining pressure. To study the implications of this nonlinearity and the associated role of particle breakage, monotonically loaded drained triaxial tests were conducted using a large-scale cylindrical triaxial apparatus. A nonlinear critical state envelope is determined in the q-p= and -lnp= planes. Mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. In this paper, an elastoplastic constitutive model based on the critical state soil mechanics framework is presented to capture the salient aspects of stress-strain behaviour and degradation of ballast. Constitutive parameters were conveniently determined from large-scale laboratory tests. The model is able to predict the monotonic shear behaviour of ballast corroborating with the laboratory measurements. The proposed model is further validated using experimental results available from past independent studies. Disciplines Engineering | Science and Technology Studies Publication DetailsIndraratna, B., Sun, Q. & Nimbalkar, S. (2015). Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage. Canadian Geotechnical Journal, 52 (1) Abstract: A substantial amount of experimental evidence suggests that the critical state envelope for ballast is non-linear, especially at low confining pressure. In order to study the implications of this non-linearity and the associated role of particle breakage, monotonically loaded drained triaxial tests were conducted using the large-scale cylindrical triaxial apparatus. A non-linear critical state envelope is determined in the q-p' and  -lnp' planes.Mathematical expressions for critical state stress ratio and specific volume are proposed to incorporate the evolution of particle breakage during monotonic shearing. In this paper, an elasto-plastic constitutive model based on the critical state soil mechanics framework is presented to capture the salient aspects of stress-strain behaviour and degradation of ballast.Constitutive parameters were conveniently determined from large-scale laboratory tests. The model is able to predict the monotonic shear behaviour of ballast corroborating with the laboratory measurements. The proposed model is further validated using experimental results available from past independent studies.

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Section: Model Validationmentioning

confidence: 99%

“…The mechanical response of rockfill is largely dominated by particle breakage. The predictions of the stress-strain-volumetric behaviour for three rockfill materials (Varadarajan, et al 2003;Chavez and Alonso 2003) have been made by using the current model as shown in Figs. 13.…”

Section: Model Validationmentioning

confidence: 99%

Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

2015

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“…Considering impounding e ect, the inner friction decreases the angle coe cient of the material, which was imagined to be 20% regarding the technical literature [16,17]. Decreasing coe cient of Young's modulus was also imagined to be 50% with regard to the carried-out studies [18,19].…”

Section: Numerical Analysismentioning

confidence: 99%

Numerical Analysis and Monitoring of an Embankment Dam During Construction and First Impounding (Case Study: Siah Sang Dam)

2017

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Abstract. Monitoring embankment dams is of crucial importance. In earth dams, the pore pressures, earth pressures, and displacements occurring during construction and function are measured at the time of the rst impounding and exploitation by installing essential instruments, and so the dam's performance is evaluated and analyzed. Scope of the present research is the evaluation of Siah-Sang Dam performance through the results of instruments and back analysis, conducted by FLAC software. The Mohr-Coulomb elasticplastic model has been considered as the behavioral model of the dam, and the e ect of the upstream shell's materials deformation has been modeled at the time of the initial impounding. Following that, comparing the results of the numerical analysis with the measured values indicates that there is a proper consistency between these two values. Moreover, it was observed that the dam's performance was suitable regarding the created pore water pressure, displacements, and stresses in the construction period as well as during the rst impounding. In addition, susceptibility of the hydraulic fracturing was assessed by calculating the arching ratio. It was concluded that this dam is secure in comparison with the behavior of other similar dams in Iran and the world.

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“…This phenomenon is attributed to the increase amounts of particle crushing at higher normal stresses (Varadarajan, et al 11 , Lade et al 6 ). This can not be verified for the three materials investigated since the quantification of particle crushing was calculated for the complete samples CC1, CC2 and CB1 (for al the tests for the different normal loads) and not for each of the individual normal stresses.…”

Section: Stress-displacement Behaviourmentioning

confidence: 99%

Shear behaviour of crushed concrete and bricks

Chidiroglou¹,

O'Flaherty

Goodwin

2009

Proceedings of the Institution of Civil Engineers - Constructio

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Demolition waste materials mainly consist of concrete and bricks and arise from the demolition of existing structures and buildings. Environmental and economical reasons make their recycling necessary, but to date, their use is curtailed due to the lack of research in determining their properties. This paper reports on the efforts to understand the behavioural characteristics of three types of recycled material to determine their potential for engineering fill applications. For this purpose, their physical and mechanical characteristics have been extensively investigated. Two types of crushed concrete, one obtained straight after demolition and the other processed to industry specifications, and one type of crushed brick was tested. An extensive large scale shear box test regime was employed to determine the shear strength behaviour of the materials. The influence of the normal stress on the peak friction angle, the shear stress-horizontal displacement relationship and horizontal displacement-vertical displacement behaviour of the materials are discussed in this paper. The results show that the behaviour of the three recycled materials during shear testing is similar to the behaviour exhibited by natural granular materials from literature. Concluding, the shear box test results have shown that the specific demolition waste products exhibit considerable shear strength and can be utilised in construction as low level engineering fill.

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Testing and Modeling Two Rockfill Materials

Cited by 274 publications

References 12 publications

Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

Observed and predicted behaviour of rail ballast under monotonic loading capturing particle breakage

Numerical Analysis and Monitoring of an Embankment Dam During Construction and First Impounding (Case Study: Siah Sang Dam)

Shear behaviour of crushed concrete and bricks

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