Modelling and calibration for cyclic soil-structure interface behaviour
01 Jun 2019-Vol. 92, pp 13007
TL;DR: In this article, the results of an experimental campaign for the parameter calibration of the constitutive model are presented, where the tests have been conducted with a ring shear device involving different normal stresses, roughness of the steel plates as well as cyclic loading.
Abstract: The structural performance of many geotechnical systems (e.g. axially-loaded pile foundations), depends on the shearing resistance at the soil interface, which may govern the load bearing capacity of the foundation. Experimental investigations have shown that this interaction is mainly localised within a narrow shear band next to the structure. Under cyclic loading, a contraction of the soil at the interface may arise (net volume loss), possibly leading to a stress relaxation and thus to a reduction of the load bearing capacity (the so-called friction fatigue). Based on the constitutive similarities between soil continua and interfaces, we propose here the adaption of a Generalized Plasticity model for sandy soils for the numerical analysis of interface problems. In this contribution, the results of an experimental campaign for the parameter calibration of the constitutive model are presented. The tests have been conducted with a ring shear device involving different normal stresses, roughness of the steel plates as well as cyclic loading. The new modelling approach shows promising results and has the additional practical advantage that the interface zone and the soil continuum can both be described with the same constitutive model in general boundary value problems.
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01 Jan 2009
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TL;DR: In this article , the authors used a numerical modeling approach employing ductile fragility curves to assess the vulnerability of a typical reinforced concrete bridge model supported on shallow foundations, where both scouring and seismic risks were considered.
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26 Apr 1991TL;DR: In this article, the basic ingredients of a family of simple elastic-plastic models of soil behaviour are described and used in numerical analyses. But the models on which this book concentrates are simple, understanding of these will indicate the ways in which more sophisticated models will perform.
Abstract: Soils can rarely be described as ideally elastic or perfectly plastic and yet simple elastic and plastic models form the basis for the most traditional geotechnical engineering calculations. With the advent of cheap powerful computers the possibility of performing analyses based on more realistic models has become widely available. One of the aims of this book is to describe the basic ingredients of a family of simple elastic-plastic models of soil behaviour and to demonstrate how such models can be used in numerical analyses. Such numerical analyses are often regarded as mysterious black boxes but a proper appreciation of their worth requires an understanding of the numerical models on which they are based. Though the models on which this book concentrates are simple, understanding of these will indicate the ways in which more sophisticated models will perform.
1,671 citations
TL;DR: In this article, a linkage type element is developed for adding rock joint stiffness to the structural stiffness matrix describing the behavior of a system of rock blocks and joints and a new classification of joints is introduced, based on the application of the joint element to finite element analysis of structures in jointed rock.
Abstract: The representation of discontinuities in analysis of blocky rock is discussed. A linkage type element is developed for addition of rock joint stiffness to the structural stiffness matrix describing the behavior of a system of rock blocks and joints. Several basic problems of jointed rock are studied. These examples demonstrate the marked influence joints may have on the stress distribution, displacements, and failure pattern of an underground opening or other structures in jointed rock. A new classification of joints is introduced, based on the application of the joint element to finite element analysis of structures in jointed rock. Normal stiffness, tangential stiffness, and shear strength are used as parameters in the classification system. The methods discussed in this paper allow a jointed rock mass to be treated as a system of blocks and links. Just as analysis of a reinforced concrete building requires detailed knowledge of the behavior of concrete alone and steel alone, the joint stiffness approach calls for and uses detailed description of the behavior of rock blocks and rock joints independently.
1,186 citations
TL;DR: In this paper, the authors present a mathematical model for the formation of a team of joined rocks, based on the idea that a particULAR JOINT was assumed to OCCUR at a given location.
Abstract: VASILESCU SUGGESTS THAT ROCK MECHANICS IS A NATURAL SCIENCE, ALTHOUGH THE AUTHOR IN THE CONTEXT OF THE PROBLEM BEING DISCUSSED, CONSIDERS THAT ROCK MECHANICS IS A BRANCH OF ENGINEERING, AND MATHEMATICALLY BASED METHODS OF DESCRIBING ROCK BEHAVIOR ARE NOT ONLY APPROPRIATE, BUT EXTREMELY POWERFUL. IN THE DESIGN OF EXCAVATIONS IN JOINT ROCK, ROCK MECHANICS IS VERY USEFUL. TERZAGHI OFTEN EXPRESSED THE VIEW THAT GEOLOGICAL UNCERTAINTIES LIMITED THE RELIABILITY OF ANALYSES IN WHICH A PARTICULAR JOINT WAS ASSUMED TO OCCUR AT A GIVEN LOCATION. THE MATHEMATICAL MODEL ENABLES THE EXTREME CASES TO BE STUDIED THROUGH PARAMETER STUDIES AND STATISTICAL METHODS. REPORTS ISSUED: A MODEL FOR THE MECHANICS OF JOINTED ROCK, RICHARD E. GOODMAN, ROBERT L. TAYLOR, TOR L. BREKKE, ASCE PROC. PAPER 5937, MAY 1968.
630 citations
TL;DR: In this article, a thin solid element, called a thin-layer element, was proposed for soil-structure interaction and rock joints, and a special constitutive model was used and various deformation modes such as no slip, slip, debonding and rebonding were incorporated.
Abstract: The idea of using a thin solid element, called a thin-layer element, in soil-structure interaction and rock joints is proposed. A special constitutive model is used and various deformation modes such as no slip, slip, debonding and rebonding are incorporated. The shear stiffness is found from special laboratory tests and the normal stiffness is assumed to be composed of participation of the thin-layer element and the adjoining solid elements. A parametric study shows that the thickness of the thin-layer element can be such that the ratio of thickness to (mean) dimension of the adjacent element is in the range of 0.01 to 0.1. A number of simple and practical problems are solved to illustrate the success of the thin-layer element for soil-structure interaction problems.
563 citations
TL;DR: In this paper, a comparison of simple shear test results for sand-steel interfaces with respect to three other types of interface testing apparatuses: the direct shear, the annular shear and the ring torsion types is made.
Abstract: The simple shear apparatus is used for tests on the interface between soil and other construction materials. A comparison was made of its advantages and disadvantages, as well as of the test results for sand-steel interfaces, with respect to three other types of interface testing apparatuses: the direct shear, the annular shear and the ring torsion types. A simple shear apparatus is less sophisticated than a ring torsion apparatus mainly in the non-uniformity of the stress distributions, but it can be used with much less technical difficulty. Good agreement was observed between the results from the three types on the correlations between the coefficient of friction and the roughness of the steel surface. The sliding displacement measured in simple shear tests showed good agreement with the observation in the ring torsion type of apparatus, but the tangential displacement in the direct shear test was larger, possibly because it included the displacement due to the strain in the sand mass inside the shear b...
318 citations