FLAC 3D model, tunnel supportMott MacDonald
has a strong track record implementing numerical modelling as an
integral part of the geotechnical engineering design process. We
use numerical modelling at all stages of the design from concept to
detailed design, for tender design and design modification on
various projects, and in our role as an independent examiner. We
adopt numerical modelling within the design process to provide more
rigorous design calculations, to improve our understanding of
ground and structure behaviour and to provide more economic design
solutions. Adoption of three-dimensional analysis for tunnel design
and other design situations is now commonplace.
Our work analysing the behaviour of soft marine clays and loose
sands, through stiff clays to massive or highly jointed bedrock. We
use soil models incorporating non-linear stress-strain stiffness to
more accurately predict ground deformations around deep
excavations. We have considerable experience in the modelling of
soil-structure interaction problems such as large multi-propped
embedded retaining walls, complex foundations and tunnel design.
Our nonlinear modelling has been extended to include concrete and
polystyrene and the time-dependent behaviour of shotcrete. We have
also carried out analyses to assess the behaviour of underground
structures subjected to seismic and dynamic loading. Numerical
analysis has been carried out within the framework of either BS8110
or Eurocode 7.
FLAC 3D model, pile-transfer beam interaction with
ground heaveFor the majority of our numerical analyses
we use the industry-standard finite difference program FLAC, which
has a wide range of in-built ground models available as well as
structural elements to represent beams, cables and piles. We also
utilise FLAC3D, which extends the capabilities of two-dimensional
FLAC modelling to three dimensions. For more simple design
conditions we utilise PLAXIS, a finite element package.
Notable projects which has made use of numerical modelling
include:
- Boston Central Artery, USA
- Delhi Metro, India
- Dublin Port Tunnel, Ireland
- Heathrow Terminal 5, Substructures UK
- Heron Quays Cofferdam, UK
- Kallang Expressway, Singapore
- Kayang Bridge, South Korea
- Kuala Lumpur LRT, Malaysia
- Mission Valley San Diego LRT extension, USA
- Singapore MRT
Tsing Ma Bridge, Hong Kong
- Wembley Stadium Redevelopment, UK
