A Hypoplastic Model for Soil-Structure Interface Behaviour

The soil-structure interface problem is an important part of soil-structure interaction research. These problems are mostly three-dimensional space problems, which is more complex to solve. In this paper, reduced stress and strain rate vectors are incorporated into the explicitly granular hypoplastic model by considering the plane strain state precisely. In addition, considering the important influence of roughness on the mechanical properties of contact surface, an improved hypoplastic model is established by incorporating the influence of roughness into the hypoplastic model, and the applicability of the new improved model is validated by comparing with the simulation results of the Mohr–Coulomb model, the explicitly granular hypoplastic models, and the experimental data. The results indicate that the improved model can be utilized to reflect the nonlinearity of the mechanical properties of the contact surface, which is in good agreement with the experimental data.

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Numerical studies of soil–structure interaction using a simple interface model

Canadian Geotechnical Journal ◽

10.1139/t88-016 ◽

1988 ◽

Vol 25 (1) ◽

pp. 158-162 ◽

Cited By ~ 10

Author(s):

D. V. Griffiths

Keyword(s):

Soil Structure ◽

Full Range ◽

Interface Roughness ◽

Soil Structure Interaction ◽

Upper And Lower Bounds ◽

Rational Approach ◽

Interface Model ◽

Closed Form Solutions ◽

Structure Interaction ◽

Interface Behaviour

The effect of interface roughness in problems of soil–structure interaction is demonstrated using a simple finite element interface model. Three examples of geotechnical interest are presented to demonstrate the approach, and comparisons are made with closed-form solutions where available. Both rough and smooth extremes of interface behaviour are analysed. The smooth interface modelling is performed without the use of specialized elements, and involves uncoupling and rotation of freedoms parallel to the proposed interface direction. It is suggested that, in view of the uncertainties often associated with interface properties, a rational approach for engineering purposes is to obtain solutions for the perfectly rough and perfectly smooth cases leading to upper and lower bounds on the full range of interface behaviour. Key words: finite elements, interfaces, soil–structure interaction, foundations, lateral loads, culverts, piles.

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Thermal effects on mechanical behaviour of soil–structure interface

Canadian Geotechnical Journal ◽

10.1139/cgj-2018-0583 ◽

2020 ◽

Vol 57 (1) ◽

pp. 32-47 ◽

Cited By ~ 6

Author(s):

Soheib Maghsoodi ◽

Olivier Cuisinier ◽

Farimah Masrouri

Keyword(s):

Shear Strength ◽

Mechanical Behaviour ◽

Soil Structure ◽

Clayey Soil ◽

Normal Load ◽

Shear Characteristics ◽

Constant Normal Stiffness ◽

Constant Normal Load ◽

Dense State ◽

Interface Behaviour

Mechanical behaviour of the soil–structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermoactive structures, due to nonisothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical behaviour of soils and the soil–structure interface. Constant normal load (CNL) and constant normal stiffness (CNS) tests were performed on the soil and soil–structure interface in a direct shear device at temperatures of 5, 22, and 60 °C. Fontainebleau sand and kaolin clay were used as proxies for sandy and clayey soils. The sandy soil was prepared in a dense state and the clayey soil was prepared in a normally consolidated state. Results show that the applied thermal variations have a negligible effect on the shear strength of the sand and sand–structure interface under CNL and CNS conditions, and the soil and soil–structure interface behaviour could be considered thermally independent. In clay samples, an increase in the temperature increased the cohesion and consequently the shear strength, due to thermal contraction during heating. The temperature rise had less impact on the shear strength in the case of the clay–structure interface than in the clay samples. The adhesion of the clay–structure interface is less than the cohesion of the clay samples.

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Thermo-mechanical behaviour of clay-structure interface

E3S Web of Conferences ◽

10.1051/e3sconf/20199210002 ◽

2019 ◽

Vol 92 ◽

pp. 10002 ◽

Cited By ~ 1

Author(s):

Soheib Maghsoodi ◽

Olivier Cuisinier ◽

Farimah Masrouri

Keyword(s):

Shear Strength ◽

Mechanical Behaviour ◽

Soil Structure ◽

Normal Load ◽

Active Structures ◽

Shear Characteristics ◽

Constant Normal Stiffness ◽

Constant Normal Load ◽

Effects Of Temperature ◽

Interface Behaviour

The mechanical behaviour of the soil-structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermo-active structures, due to non-isothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical behaviour of soils and soil-structure interface. Constant normal load (CNL) and constant normal stiffness (CNS) tests were performed on soil and soil-structure interface in a direct shear device at temperatures of 5, 22 and 60 °C. Kaolin clay was used as proxy for clayey soils. The results showed that, in clay samples the temperature increase, increased the cohesion and consequently the shear strength, due to thermal contraction during heating. The temperature rise had less impact on the shear strength in the case of the clay-structure interface than in the clay samples. The adhesion of the clay-structure interface, is less than the cohesion of the clay samples.

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