Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies

Herle, Ivo; Gudehus, G.

doi:10.1002/(sici)1099-1484(199909)4:5<461::aid-cfm71>3.0.co;2-p

Cited by 373 publications

(131 citation statements)

References 43 publications

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“…The post peak strain softening is increasing with the decrease in particle size, though the relative density of the samples was same in all three cases. Herle and Gudehus [33] and Atkinson [34] showed that the ultimate friction angle (/ r ) in direct shear tests is equal to the angle of repose. To confirm this, angle of repose of the coarse, medium and FSs were determined as per ASTM C1444 [35].…”

Section: Direct Shear Testsmentioning

confidence: 99%

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

Vangla

Latha

2015

Int. J. of Geosynth. and Ground Eng.

120

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Size and morphological characteristics of particles play vital role on the shear and interfacial shear strength of sands. Often, effects of these parameters are merged and cannot be easily separated. Effect of size of the particles on the shear and interfacial shear strength of sands is presented in this paper through direct shear and interface direct shear tests complemented with image analyses and surface roughness studies. To eliminate the effect of morphological characteristics, three sands of different particle sizes with similar morphological characteristics like angularity, roundness, sphericity and roughness were selected for the study. These morphological characteristics for all three sands were determined from the analysis of scanning electron microscope images and were found to be similar for all three sands. It was observed from the symmetric direct shear tests that the particle size has no effect on the peak friction angle when the tests were carried out at same void ratio. However, ultimate friction angles were affected by the particle size. Shear band thickness was estimated from image segmentation analysis of the profiles of colored sand columns during shear and the same was correlated to the particle size. Interface direct shear tests were carried out on sand-geomembrane interfaces to study the effect of particle size on the interfacial shear strength. Microscopic images of geomembranes were captured after the interface shear tests to understand the change in surface roughness of the geomembrane due to particle indentations. Surface roughness studies on geomembrane samples after the tests confirmed that the plowing and groove formation on geomembranes during interface shear tests depend on the particle size as well as the relative roughness of the sand particles with respect to the membrane. Sand of medium particle size showed highest interfacial strength because of more number of effective contacts per unit area of the interface.

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Section: Direct Shear Testsmentioning

confidence: 99%

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

Vangla

Latha

2015

Int. J. of Geosynth. and Ground Eng.

120

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“…The determination of these material constants from experimental laboratory test is roughly described in the articles cited. More detailed information can be found in [26,44].…”

Section: Discussionmentioning

confidence: 99%

“…The main advantage is the use of the void ratio e and of the socalled intergranular strain δ capturing loading history in the set of material state variables. As a result, the behavior of sand for various monotonic and cyclic loading programs can be described by using only a single set of hypoplastic material constants [24,25,26]. There might be indeed alternative models possessing comparable features, but to the knowledge of the authors these have not been used in ALE calculations yet.…”

Section: Constitutive Equationsmentioning

confidence: 99%

An ALE method for penetration into sand utilizing optimization-based mesh motion

Aubram

Rackwitz

Wriggers

et al. 2015

Computers and Geotechnics

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“…Calibration procedure for the von Wolffersdorff hypoplastic model is explained by Herle & Gudehus (1999) and Mašin (2011).…”

Section: Hypoplasticitymentioning

confidence: 99%

“…According to (Herle & Gudehus 1999) the hypoplastic law is a good choice for cohesionless soils because it describes the behavior of soil very realistic; it also associates the strain rate to the stress rate. According to Anaraki (2008) in hypoplasticity is not necessary a yield surface or a decomposition of strain rate into elastic and plastic portions.…”

Section: Introductionmentioning

confidence: 99%

Application of Constitutive Models in the Volcanic Tephra “Tierra Blanca Joven”

et al. 2014

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The volcanic tephra Tierra Blanca Joven (TBJ) covers most of the Metropolitan Area of San Salvador where problems of mass wasting problems occur. To understand its behavior the Mohr-Coulomb, Modified Cam Clay and Hypoplasticity constitutive models were used to simulate consolidation and triaxial tests; looking for the one closer to real laboratory results. The constitutive models are used into finite element software to simulate the behavior of a soil mass (slope stability, bearing capacity etc.). Shear box, drained triaxial and consolidation tests were made in order to obtain the parameters for the models. The soil must be either saturated or dry, otherwise unsaturated properties are needed. After comparing the results of the constitutive model it was observed that none of them display exactly the real behavior observed in the laboratory. Mohr-Coulomb is the model that is used in all the geotechnical studies in El Salvador and it was the model that showed more deficiencies. Hypoplasticity showed good results in the triaxial tests but deviated from reality in the consolidation results. The results indicate that a different constitutive model and lab equipment are necessary (as TBJ is an unsaturated soil) to characterize the behavior of the soils in El Salvador. Keywords:Constitutive model, hypoplasticity, Tierra Blanca Joven, Mohr-Coulomb, Modified Cam Clay. ResumenLa tefra volcánica Tierra Blanca Joven (TBJ) cubre la mayoría del Área Metropolitana de San Salvador, donde ocurren problemas de denudación. Para entender su comportamiento los modelos constitutivos Mohr-Coulomb, Cam Clay Modificado e Hipoplasticidad fueron usados para simular pruebas de consolidación y triaxiales; comparándolos con resultados de laboratorio reales. Los modelos constitutivos son usados en programas de elementos finitos para simular el comportamiento del suelo (estabilidad de taludes, capacidad de carga etc.). Pruebas de caja de corte, triaxial drenada y consolidación se realizaron para obtener los parámetros de los modelos. El suelo tiene que estar saturado o seco, sino propiedades de suelo parcialmente saturado son necesarias. Después de comparar los resultados de los modelos constitutivos se observo que ninguno mostro exactamente el comportamiento real observado en laboratorio. Mohr-Coulomb es el modelo que se usa en todos los estudios geotécnicos en El Salvador y fue el que mostro mas deficiencias. Hipoplasticidad mostro buenos resultados en la prueba triaxial pero se desvió de la realidad al compararlo con la consolidación. Estos resultados indican que un modelo constitutivo diferente y equipo de laboratorio es necesario (ya que TBJ es un suelo parcialmente saturado) para caracterizar el comportamiento de los suelos en El Salvador.

show abstract

Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies

Cited by 373 publications

References 43 publications

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

An ALE method for penetration into sand utilizing optimization-based mesh motion

Application of Constitutive Models in the Volcanic Tephra “Tierra Blanca Joven”

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