Mechanics of geomaterial interfaces selvadurai a p s boulon m j
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This paper presents a finite element approach to solve geotechnical problems with interfaces. Boulon et al; boundary element modelling of geomaterial interfaces, A. Models of ice-structure contact for engineering applications K. This simple element has the advantages of easy implementation into standard finite element programs and high accuracy for stress distribution in interface. The specific procedures required in the algorithm to integrate the constitutive law are indicated. This chapter describes the aspects of the implementation of this type of elements.

Sodhi; models of ice-structure contact for engineering applications, K. The subject of geomaterial interfaces recognizes the important influences of the interface behaviour on the performance of interfaces involving cementaceous materials such as concrete and steel, ice-structure interfaces, concrete-rock interfaces and interfaces encountered in soil reinforcement. The analyses show the predicted limiting active and passive pressure on the wall are dependent on the maximum wall friction angle and are in reasonable agreement with accepted approximate analytical solutions. A series of finite element analyses have been undertaken to investigate the effects of interface properties on the behaviour of a vertical retaining wall and the deformation of the ground around it. Proposed hypothesis are much deeply discussed herein for better understanding which is normally neglected in literature review papers due to the large number of references and limit of space.

Gens et al; concrete joints, J. This research also tends to conduct a parametric study on respective parameters of the new joint element. Rigby; soil-structure interfaces - experimental aspects, M. Behavioral deficiencies that have not appeared in the literature are identified. Eigenmode analysis demonstrates that the stress behavior of an interface element can be improved by using the Newton—Cotes integration scheme.

In instances where the interacting media are elastic, the interfaces are modeled as boundary constraints between regions. Part 3 Steel-concrete interfaces: lattice model for analysing steel-concrete interface behaviour, J. Modelling of constitutive relationship of steel fiber-concrete interface S. Numerical examples show that the method is effective for solving the frictional contact problems. In the proposed algorithm, continuous interface elements with a finite thickness are reconstructed at every load step based on current interface configuration, by employing the concept of contact band element.

Conventional Gauss integration scheme used to evaluate the interpolation function matrix of the interface element is found to be the source of the oscillations. As a result, in many instances, the response of the interface can be the governing criterion in the performance of a geomechanics problem. Finally, two examples of strip footing and pull-out problems are presented. Balazs, damage and plasticity computations, J. Frederking; an ice-structure interaction model, D. In this approach, contact interface equations are discretized by contact point-discretization; and the global discretized system equation are transformed into a standard linear complementary problem that can be solved readily by using the Lemke method.

The analysis of the problem is approached via an incremental boundary element technique which accommodates both non-linear effects at the fibre inclusion-elastic medium interface and singular behaviour of the stress field at the crack tip. In this paper we examine the problem where the fibre inclusion-matrix interface exhibits non-linear interface effects characterized by processes such as Coulomb friction and dilatant plasticity with degradation of dilatancy which depends on plastic energy dissipation at the interface. Rock joints: theory, constitutive equations M. Special reference is made to a simplified constitutive relationship that permits analytical integration. Unterreiner; interfaces in particulate materials, A.

These efforts have been largely due to the observation that the conventional idealizations of the behaviour of interfaces between materials by frictionless contact, bonded contact, Coulomb friction or finite friction tend to omit many interesting and important influences of special relevance to geomaterials. Mechanics of Rock and Concrete Joints. Part 4 Mechanics of rock and concrete joints: mechanics of rock joints - experimental aspects, L. An analytical solution is presented for the compression of a long elastic block, bonded along one side to a rigid material. Undesirable stress oscillations are also investigated whenever large stress gradients exist over the contact surfaces. The boundary between a rigid embedded wall and the soil is modelled with zero thickness interface elements.

Geotechnical problem under plane strain condition, as the embankment problem subject to self-weight force, is analyzed and comparison between the geometric linear and nonlinear formulations highlights the importance of the nonlinear formulation for high height fills. As a result, in many instances, the response of the interface can be the governing criterion in the performance of a geomechanics problem. An improved linear zero-thickness interface element that overcomes the aforementioned deficiencies is developed and its predictive capabilities critically assessed. It not only provides the basic derivation of the dynamic governing equations for rotating shells, but documents benchmark results for free vibration, critical speed and parametric resonance. Numerical examples are given for modeling of concrete-reinforcement bond, pile-soil interaction, and footing-soil interaction; the results for the first two examples are compared to available experimental results. There are numerous engineering applications for high-speed rotating structures which rotate about their symmetric axes.

The significant manner in which non-linear effects, dilatancy, contact degradation, hardening and softening, etc. Then, combined with frictional contact laws, a linear complementary model with the meshless method is formulated. Steel-concrete interfaces: experimental aspects H. A new meshless numerical method for frictional contact problem is presented. Balazs, damage and plasticity computations, J. Simulation of a pullout test has shown that large pullout displacement and realistic structure configuration might be effectively modeled and smooth distributions of mobilized shear stresses along the interface and axial forces in the reinforcement can be obtained without any fluctuation for different interface element thicknesses. In this paper the performance of two commonly used linear zero-thickness interface elements is examined in detail.