Practical Equivalent Continuum Model for Simulation of Jointed Rock Mass Using FLAC3D

Sitharam, T. G.; Maji, V. B.; Verma, A. K.

doi:10.1061/(asce)1532-3641(2007)7:5(389)

Cited by 42 publications

(18 citation statements)

References 4 publications

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“…Because FLAC3D directly constructs finite differences in its computations (unlike the CAE program), its three-dimensional (3D) mesh is constructed around the geometry of the actual physical object [17][18][19][20][21]. However, the preprocessing of complex grids in FLAC3D is somewhat inadequate, as a result.…”

Section: Computational Modelmentioning

confidence: 99%

A Study on the Mechanisms of Interaction between Deep Foundation Pits and the Pile Foundations of Adjacent Skewed Arches as well as Methods for Deformation Control

2018

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The construction of deep foundation pits is characterized by heavy loads on pile foundations, complex interactions between the foundation pit and pile foundations, and stringent requirements for deformation control. In this work, FLAC3D was used to perform computational analyses on the displacement responses of pile caps and the retaining walls of foundation pits in a variety of cases and reinforcement schemes. The computational results indicate that the piles of skewed arches interact with the retaining walls of the foundation pits through soil masses. We also revealed the mechanism by which deep foundation pits interacted with the pile foundations of adjacent skewed arches. Based on the mechanisms of interaction between foundation pit excavations and the piles of skewed arches, we proposed three reinforcement schemes for controlling the deformations associated with these interactions. The arched wall reinforcement scheme could provide a satisfactory result in terms of the control of horizontal displacements in the pile foundations and project costs.

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Section: Computational Modelmentioning

confidence: 99%

A Study on the Mechanisms of Interaction between Deep Foundation Pits and the Pile Foundations of Adjacent Skewed Arches as well as Methods for Deformation Control

2018

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“…In the past several decades, a lot of lab tests with samples containing a single or multiple joint sets under confined and unconfined conditions have been implemented to investigate the joint orientation effect [7][8][9]. With the ongoing development of computer based simulation techniques, more sophisticated models have been developed in recent years and it is possible to incorporate more aspects into the simulations [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Application of the Mohr-Coulomb Yield Criterion for Rocks with Multiple Joint Sets Using Fast Lagrangian Analysis of Continua 2D (FLAC2D) Software

Chang

Konietzky

2018

Energies

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Abstract:The anisotropic behavior of a rock mass with persistent and planar joint sets is mainly governed by the geometrical and mechanical characteristics of the joints. The aim of the study is to develop a continuum-based approach for simulation of multi jointed geomaterials. Within the continuum methods, the discontinuities are regarded as smeared cracks in an implicit manner and all the joint parameters are incorporated into the equivalent constitutive equations. A new equivalent continuum model, called multi-joint model, is developed for jointed rock masses which may contain up to three arbitrary persistent joint sets. The Mohr-Coulomb yield criterion is used to check failure of the intact rock and the joints. The proposed model has solved the issue of multiple plasticity surfaces involved in this approach combined with multiple failure mechanisms. The multi-joint model was implemented into Fast Lagrangian Analysis of Continua software (FLAC) and is verified against the strength anisotropy behavior of jointed rock. A case study considering a circular excavation under uniform and non-uniform in-situ stresses is used to illustrate the practical application. The multi-joint model is compared with the ubiquitous joint model.

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“…Verma (2006a, 2006b) have analyzed the effect of rate of excavation on damage of tunnel. Sitharam et al (2005Sitharam et al ( , 2007 have implemented Duncan Chang constitutive model in FLAC3D and predicted the deformation of a tunnel in Naptha Jhakri in India.…”

Section: Introductionmentioning

confidence: 99%

“…This technique has been widely used by many researchers (Dawson and Roth 1999;Sitharam et al 2005Sitharam et al , 2007Pellet and Verma 2006a, b;Singh and Verma 2007;Singh and Singh 1999) to simulate slope stability, tunnels, caverns and dam foundations, etc. Numerical simulation provides a flexible environment to test the behavior of a rock mass, i.e., various parameters can be modified as per requirement and need of the actual problem.…”

Section: Introductionmentioning

confidence: 99%

Assessment of tunnel instability—a numerical approach

Verma

Singh

2009

Arab J Geosci

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This paper outlines the application of numerical modeling to predict deformation and stability of tunnel to be excavated in Bansagar, M.P., India. To meet the everincreasing demand of transportation, energy, and other infrastructure projects, a large volume of rock tunneling is being carried out throughout the world. The geotechnical properties along the route of the 1,800-m long tunnel in the Bansagar region of India have been studied. The rock mass rating and rock mass quality systems were employed for empirical rock mass quality determination. Numerical analysis for the stress-strain distribution of the tunnel excavation and support systems was also carried out. In order to simulate the excavation of tunnel (NATM) at a depth of 150 m below the ground , a series of finite element analyses using Mohr-coulomb elasto-plastic constitutive model has been carried out using PLAXIS 2D. The stability of tunnel has been analyzed, and stress pattern have been discussed.

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Practical Equivalent Continuum Model for Simulation of Jointed Rock Mass Using FLAC3D

Cited by 42 publications

References 4 publications

A Study on the Mechanisms of Interaction between Deep Foundation Pits and the Pile Foundations of Adjacent Skewed Arches as well as Methods for Deformation Control

A Study on the Mechanisms of Interaction between Deep Foundation Pits and the Pile Foundations of Adjacent Skewed Arches as well as Methods for Deformation Control

Application of the Mohr-Coulomb Yield Criterion for Rocks with Multiple Joint Sets Using Fast Lagrangian Analysis of Continua 2D (FLAC2D) Software

Assessment of tunnel instability—a numerical approach

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