dynamic relaxation applied to continuum and discontinuum numerical models in geomechanics pdf

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

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Flowchart of DEM Modeling Stability Analysis of Large Underground Powerhouse Caverns

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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. A number of examples are also presented which illustrate the usefulness of different discrete element types in engineering analyses of discontinuum problems. Report bugs here.

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. The rock mass mechanical property values for the tunnel shapes have been estimated through a back-analysis procedure using available field deformation data. The back-analysis has been carried out through a pseudo-time dependent support installation routine which incorporates the effect of time through a stress-relaxation mechanism. Additionally, the importance of incorporating stress relaxation before support installation has been illustrated through the increased support factor of safety and reduced grout failures.

Numerical Modelling and analysis of slope stability within fracture dominated rock masses

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Dzik and C. Detournay and P. Dzik , C. Detournay , P. Cundall Published

Abstract The goal of this review paper is to provide a summary of selected discrete element and hybrid finite—discrete element modeling techniques that have emerged in the field of rock mechanics as simulation tools for fracturing processes in rocks and rock masses. The fundamental principles of each computer code are illustrated with particular emphasis on the approach specifically adopted to simulate fracture nucleation and propagation and to account for the presence of rock mass discontinuities. This description is accompanied by a brief review of application studies focusing on laboratory-scale models of rock failure processes and on the simulation of damage development around underground excavations. The goal of this review paper is to provide a summary of selected discrete element and hybrid finite— discrete element modeling techniques that have emerged in the field of rock mechanics as simulation tools for fracturing processes in rocks and rock masses. Production and hosting by. A large body of experimental research shows that the failure process in brittle rocks under compression is characterized by complicated micromechanical processes, including the nucleation, growth and coalescence of microcracks, which lead to strain localization in the form of macroscopic fracturing Lockner et al.

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Key words: numerical methods, geomechanics, continuum, discontinuum, finite continuous displacement field is produced and the use of a continuum model seems Southwell [7] developed the relaxation method, which provides a fast solution of The method can also be readily used to solve dynamic problems, where.


A Practical Approach to Challenges in Meshing Mining Models

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.

Tunnelling processes lead to stress changes surrounding an underground opening resulting in the disturbance and potential damage of the surrounding ground. Especially, when it comes to hard rocks at great depths, the rockmass is more likely to respond in a brittle manner during the excavation. Continuum numerical modelling and discontinuum techniques have been employed in order to capture the complex nature of fracture initiation and propagation at low-confinement conditions surrounding an underground opening. In the present study, the hybrid finite-discrete element method FDEM is used and compared to techniques using the finite element method FEM , in order to investigate the efficiency of these methods in simulating brittle fracturing. Following the comparison of these models, additional analyses are performed by integrating discrete fracture network DFN geometries in order to examine the effect of the explicit simulation of joints in brittle rockmasses.

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This paper presents a new numerical method for multiscale modeling of composite materials. In particular, it offers the same degree of detail as the CM, on the microscale, and manages the discrete elements individually such as the DEM—allowing finite displacements and rotations—on the macroscale. Moreover, the DECM is able to activate crack propagation until complete detachment and automatically recognizes new contacts.

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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.

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Numerical Modelling and analysis of slope stability within fracture dominated rock masses.

Беккер повернулся и еще раз оглядел больничную палату. В ней царила полная тишина. Прямо перед ним, откинувшись на груду старых подушек, лежал пожилой человек с ярко-белой гипсовой повязкой на правом запястье. ГЛАВА 21 Голос американца, звонившего Нуматаке по прямой линии, казался взволнованным: - Мистер Нуматака, в моем распоряжении не больше минуты. - Хорошо.

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5 Comments

  1. Adrien C.

    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-.

    21.12.2020 at 18:52 Reply
  2. Petronio R.

    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.

    23.12.2020 at 02:57 Reply
  3. PacГ­fico V.

    sentative equivalent continuum models for jointed rock is quite table, two general methods are used in both groups to solve for NUMERICAL CODES FOR DISCONTINUUM ANALYSIS Cundall () has shown that dynamic relaxation is better suited Numerical Methods in Geomechanics (Edmonton, ), pp.

    23.12.2020 at 18:40 Reply
  4. Oscar A.

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    24.12.2020 at 17:15 Reply
  5. Angela G.

    Spoken english book in gujarati pdf download operations and process management 2nd edition pdf

    28.12.2020 at 00:53 Reply

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