Wyniki wyszukiwania - BazTech

1

Imperfection sensitivity of shear banding in gradient-dependent Cam-clay plasticity model

Stankiewicz A.

Computer Assisted Methods in Engineering and Science

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2015

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Vol. 22, no. 2

115--139

EN

The paper deals with the numerical simulation of strain localization in granular two-phase material. A gradient enhancement of modified Cam-clay model is introduced to overcome the problem of spurious discretization sensitivity of finite element solution. Two- and three-field finite elements implemented in the finite element analysis program (FEAP) are used in numerical simulations. The attention is focused on imperfection sensitivity of shear banding simulations. An application of the modelling framework to the slope stability problem is also included.

2

Numeryczna ocena stateczności i warunków posadowienia kościoła na krawędzi skarpy warszawskiej

Koda E., Rabarijoely S.

Budownictwo i Inżynieria Środowiska

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2013

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Vol. 4, no. 1

27--35

PL

Przedmiotem pracy są obliczenia posadowienia projektowanych budynków sakralnych w strefie krawędziowej Skarpy Warszawskiej, stanowiącej zbocze wysoczyzny zbudowanej z glin zwałowych i piasków. Do obliczeń numerycznych wykorzystano wyniki badań geologicznych i geotechnicznych oraz opracowania projektowe. Obliczenia stateczności ogólnej Skarpy obciążonej projektowanymi obiektami przeprowadzono klasycznymi metodami opartymi na ocenie stanu równowagi granicznej (program GeoSlope), natomiast obliczenia odkształceń i rozkładu naprężeń w podłożu projektowanych budowli przeprowadzono z wykorzystaniem zmodyfikowanego modelu Cam-Clay (program SAGE-CRISP). Wyniki przeprowadzonych obliczeń pozwoliły na wprowadzenie zmian do projektu posadowienia i zabezpieczenia skarpy oraz projektu drenażu wokół budynków.

EN

The paper presents computations of designed structures foundation located within an edge zone of “Skarpa Warszawska”, the highland’s slope consisting of varved clays and sands. The numerical analyses were based on geological and geotechnical investigation results, as well as archive documentation was analyzed. Methods employed during numerical computation of factor of safety consisted of classic procedures based on the limit equilibrium theory (GeoSlope software), however deformation calculations and stress distribution in the subsoil of designed structures, were conducted with a use of modified Cam-Clay model (SAGE-CRISP software). The computations results allowed introducing changes to a design of structure’s foundation, reinforcement of slope and drainage system of structures.

3

Gradient-enhanced Cam-clay model in simulation of strain localization in soil

Stankiewicz A., Pamin J.

Foundations of Civil and Environmental Engineering

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2006

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No. 7

293-318

EN

The problem of instability and strain localization in granular materials is approached using a modified Cam-clay plasticity model. The attention is limited to one-phase modeling based on the Terzaghi concept of effective stress. The gradient-enhancement of the model is proposed in order to avoid the spurious discretization sensitivity of finite element solutions. The classical and gradient-dependent versions of the theory and their numerical implementation are summarized. Basic one-element tests and a typical shear banding benchmark of biaxially compressed soil specimen are discussed. Calculations arc performed using the development version of the FEAP finite clement package.

4

Finite element analysis of fluid influence on instabilities in two-phase Cam-clay plasticity model

Stankiewicz A., Pamin J.

Computer Assisted Mechanics and Engineering Sciences

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2006

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Vol. 13, No. 4

669-682

EN

The influence of fluid phase on soil instabilities is investigated using the modified Cam-clay model within a two-phase description. Spurious mesh dependence of finite element results is prevented by a gradient enhancement of the model. The results of numerical tests for one-phase and two-phase model are compared. The influence of permeability on the stabilizing role of the fluid phase is assessed.