Dynamic Relaxation Applied To Continuum And Discontinuum Numerical Models In Geomechanics Pdf

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John, Christopher M. This paper provides a brief review of some of the achievements and comments on current deficiencies and future developments. Over 20 years ago the Committee Rock Mechanics defined our discipline as 'that branch of mechanics concerned with the response of rock and rock masses to the force fields of their physical environment. Authors of papers presented at that symposium were clearly striving to find means of applying the analytical tools of mechanics, largely developed in other disciplines, to the solution of general classes of problems involving the behaviour of rock masses.

Since that time analytical rock mechanics has proceeded apace, with our discipline making its own, unique contributions to computational mechanics. Recognition of the growing importance of computational mechanics, or numerical modelling, was reflected in the selection of that topic as a major area of research by the U. Explicit finite-element and finite-difference procedures for complex, non-linear problems. The findings of that panel USNCRM, included detailed recommendations for the advancement of rock mechanics, in all its areas of practice.

Specifically, they concluded that 'Research should proceed with the final objectives of defining the following: Specific recommendations of areas for development of models included:In addition, it was recognised that there was a need for development of :Since their deliberations, some eight years ago, there have been significant advancements in both computational procedures and implementation of constitutive models. Less progress has been made toward the broader objective of guiding the Rock Mechanics Community in the appropriate application of validated computational tools.

The purpose of this paper is to briefly review the progress that has been made to date and to point to some of the more outstanding deficiencies and difficulties. Numerical methods for simulation of the behaviour of rock masses have been historically classified as continuum and discontinuum.

Continuum methods view a rock mass as a continuous material, perhaps modified by the presence of fractures that are accounted for by the constitutive model or a few discrete fractures.

The primary continuum methods for stress analysis, heat transfer and porous media flow are the discrete, or differential, methods and the integral methods. Sign In or Register. Advanced Search. Sign In. Skip Nav Destination Proceeding Navigation. Close mobile search navigation. All Days. Previous Paper. Article Navigation. Computational rock mechanics: Development and application Christopher M. John Christopher M. This Site. Google Scholar. Paper presented at the The 29th U.

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DECM: A Discrete Element for Multiscale Modeling of Composite Materials Using the Cell Method

What problems can be solved? The flowchart is provided and applied to analyze the stability of UPC in this paper. With the guide of the flowchart, the damage index Di is used as a failure type gravity-controlled or stress-induced judgment indicator. Through the calculation of three typical engineering, the problems of random blocks stability, dynamic calculation, and support system evaluation are studied, respectively, with the help of the DEM code 3DEC. The method and results of this paper can give reference to engineering projects of its category. Vast underground caverns are used for a variety of purpose in civil engineering.

Show all documents Particle breakage criteria in discrete element modelling The key task then is relating available particle strength data, for the case of diametric compression, to some characteristic measure of particle stress which may result from any number of complex loading configurations. Any suitable measure of characteristic particle stress in DEM must be easily linked to the stresses measured experimentally, i. Furthermore, the ideal measure of particle stress must be physically reasonable and give the correct results with regard to experimental data, i. Following McDowell and Bolton , the emergence of a fractal particle size distribution PSD implies that any suitable breakage regime must take into consideration the coordination number, whereby smaller particles which have higher strengths but fewer contacts suffer higher stresses than comparatively larger particles lower strengths but more contacts —otherwise, if it were simply the weakest particles that are most likely to crush, then the result would be a uniform matrix of fine particles, behaviour which is not evident in geotechnical literature. Discrete element modelling DEM for masonry infilled steel frames with multiple window openings subjected to lateral load variations The Discrete Element Method DEM falls within the general classification of force-based numerical method for discontinuum analysis techniques.

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In book: Innovative Numerical Modelling in Geomechanics (pp). Authors​: Download full-text PDF Continuum and discontinuum representations –. FLAC When dynamic relaxation algorithms are used to.

discrete element modelling (DEM)

An imperative task for successful underground mining is to ensure the stability of underground structures. This is more so for deep excavations which may be under significantly high stresses. In this manuscript, we present stability studies on two tunnels, a horseshoe-shaped and an inverted arch-shaped tunnel, in a deep coal mine in China, performed using the 3DEC distinct element code.

John, Christopher M. This paper provides a brief review of some of the achievements and comments on current deficiencies and future developments. Over 20 years ago the Committee Rock Mechanics defined our discipline as 'that branch of mechanics concerned with the response of rock and rock masses to the force fields of their physical environment.

Koliji, A. The Hongrin north dam is a double curvature concrete arch dam located in western Swiss Prealps, which attains m high. The right bank abutment of the dam mainly consists of intensively jointed Neocomian limestone and exhibits zones of potential instability.

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A generalized weighted residual method is used to formulate the discrete element method DEM for rigid or deformable bodies. It is shown that this approach provides a unified methodology for deriving many of the different discrete element techniques in current use today. This procedure is used to develop a number of different element formulations for use in problems in which the distinct bodies exhibit complex deformation behaviour such as beam or plate flexure, membrane action, and additional reinforcement of a jointed discontinuum.

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  1. Akira V.

    The paper presents a description of the methods used to model rock as DEM simulation of an underground structure subjected to dynamic loading Morris et al. bring to the geomechanics community recent advances in numerical modeling sion regarding continuum versus discontinuum methods is in-.

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