Learning

FLAC 2021 Online, Live Introductory Training
This live course will be conducted online.
7 Mar 2022 - 9 Mar 2022

FLAC3D 2021 Online, Live Introductory Training
This is a live remote training.
21 Mar 2022 - 23 Mar 2022

FLAC3D 2021 Online, Live Introductory Training


PFC 2021 Online, Live Introductory Training copy
This is an online training.
4 Apr 2022 - 7 Apr 2022

3DEC and UDEC 2021 Online, Live Introductory Training copy
Online
25 Apr 2022 - 29 Apr 2022

Meshing with Griddle 2.0 - 2022 Online course
Online, Live Introductory Training
4 May 2022 - 4 May 2022

Software Tutorials

FLAC3D 6.0 PFC Plugin Punch
FLAC3D 6.0 Interactive Model Pane
FLAC3D 6 Introductory Webinar

This video is a recording of a one hour webinar reviewing the latest features in Version 6 of FLAC3D (currently available as a pre-release). Presented by Dr. David Russell, FLAC3D Product Manager and Lead Developer.

Technical Papers

Tunnelling and reinforcement in heterogeneous ground – A case study

Abstract

A case study of tunnelling in heterogeneous ground conditions has been analysed. The case involves a tunnel excavated in mixed-face conditions, where the main host material was rock, but for a distance of about 30 m, the tunnel had to be driven through a thick layer of soil, primarily moraine and sandy soil materials.During tunnel drifting, a "chimney" cave developed through the soil layer, resulting in a surface sinkhole.This case was analysed using a three-dimensional numerical model with the FLAC3D software code, in which the soil stratigraphy and tunnel advance were modelled in detail. Tunnel and soil reinforcement in the form of jet grouting of the soil, pipe umbrella arch system, bolting, and shotcreting, was explicitly simulated in the model. The studyaimed at comparing model results with observations and measurements of ground behaviour, and to replicate the major deformation pattern observed. The modelling work was based on a previous generic study in which various factors influencing tunnel and ground surface deformations were analysed for different cases of heterogeneous ground conditions.Model calibration was performed through adjusting the soil shear strength. The calibration provided a qualitatively good agreement with observed behaviour. Calculated deformations on the ground surface were in line with measured deformations, and the location of the tunnel collapse predicted by the model. The installed tunnel reinforcement proved to be critical to match with observed behaviour. Without installed pipe umbrella arch system, calculated deformations were overestimated, and exclusion of jet grouting caused collapse of the tunnel. These findings prove that, in particular, jet grouting of the soil layer was necessary for the successful tunnel advance through the soil layer.

Use of a Finite Element Code to Model Complex Mine Water Problems

Numerical models are now used routinely to predict ground-water inflows to both surface and underground mines and to help design dewatering systems.

On the Density Variability of Poissonian Discrete Fracture Networks, with application to power-law fracture size distributions

This paper presents analytical solutions to estimate at any scale the fracture density variability associated to stochastic Discrete Fracture Networks. These analytical solutions are based upon the assumption that each fracture in the network is an independent event. Analytical solutions are developed for any kind of fracture density indicators.

Latest News
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Upcoming Events
7 Mar
FLAC 2021 Online, Live Introductory Training
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21 Mar
FLAC3D 2021 Online, Live Introductory Training
FLAC3D 2021 Online, Live Introductory Training... Read More
4 Apr
PFC 2021 Online, Live Introductory Training copy
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