VSH Turòa nad Bodvou - Nemetschek Scia

Introduction
The CS underground station of the North/South Line is on Station
Island. This station will be an integral part of the biggest public
transport hub in the Netherlands and will provide transfer facilities
between local, regional and international public transport systems.
The underground stations’ concourse is being built under the main
square in front of Amsterdam CS. There are entrances on ground
level on both sides of the main entrance of the railway station and
one at the south side of the station (in the direction of the city
centre) leading to the main underground concourse. A direct link
is being constructed from the platform level of the North/South
Line to the central underground concourse and the platforms of
the East Line.
Ground conditions
The soil profile at the site is different from the characteristic
Amsterdam soil profile. Station Island is an artificial island that was
built at the end of the nineteenth century for the construction of
Amsterdam CS railway station for Dutch Railways. The island was
created by filing in a channel area in the River IJ with sand. At the
Station Island location the first Amsterdam underground sand layer
is completely missing and the second sand layer is only partially
present. The subsoil can be classified as poor.
Boundary conditions
The design of the underground station at Amsterdam’s Central
Station (CS) was largely determined by local environmental
constraints. The underground station is being built in front of,
behind and also underneath the historic central railway station.
Damage to the listed station building and delays to the different
passengers and existing traffic flows are not acceptable. A further
complication in the design was the soft and highly variable subsoil.
Building an underground railway station on such a location can
be considered as one of the most challenging constructions of the
North-South line.
Choice of software
For the many unique, project-specific questions there are no existing
regulations. This requires a multi-purpose software solution.
Due to the high developed graphical output and the many modules
we were able to solve a large scale of technical and geotechnical
problems by using ESA-Prima Win in combination with M-Sheet
and M-Foundation.
Short description of the technical challenges
Many phases during the building process are characteristic for
this project. These phases have a major influence on the applied
building method.
Noord/Zuidlijn, station Voorplein, part of Central Station Amterdam
A distinction can be made between the following parts with their
own building phase:
• The deep part with diaphragm walls, bored piles and jet grout
struts. The deck of the roof will be build in parts and will be
in use when the pit is excavated. The deep part will lead the
passengers to the North/South Line platform with a connection
to the immersed tunnel under the Central Station;
• The middle deep part with diaphragm walls, driven piles and
underwater concrete. The middle deep part connects the North-
South line with the existing East Line;
• The entrances from the central underground concourse to
ground level.
The following parts are specially mentioned
Diaphragm walls
The permanent diaphragm walls are calculated with MSheet.
Because of unequal excavations the reaction forces will be redistributed.
This redistribution is determined with ESA-Prima Win and
after this corrected in MSheet. After excavation a secondary cast
inner wall will be made. This compound wall has a complex geometry
and is calculated with 3D-Shell.
Jet Grout Strut
Stresses in the diaphragm walls will be reduced by applying a horizontal
jet grout strut which is placed before excavation. During
excavation normal forces and curvature due to swelling groundlayers
will occur. This complex situation is investigated with a 3D
Shell model including non-linear spring supports.
Bored piles / steel concrete columns
Before excavation the roof structure is made. This structure will be
supported by 20 m long steel concrete columns placed in 40 m
long bored piles with a diameter of 1200 mm.
The bearing capacity is determined by MFoundation. The structural
behavior is determined by ESA-Prima Win and includes non-linear
soil behavior and second order effect.
Other structural parts
The walls, floors are all calculated with ESA-Prima Win using
different kind of modules.
Points for emphasis
It is important to keep complex 3D-models simple and more
controllable. Clear agreements have been made concerning the
influence of several construction components. Where necessary,
calculations have been completed with the geotechnical programs
of the MSerie.
This ensures an optimum interaction of the possibilities of constructive
and geotechnical software.
Used modules
• MSheet, MFoundation
• 3D Shell
• 2D Plate and 2D Wall
• 2D and 3D Frame
• Physical non-linear conditions
• Second order and stability frame
• Construction stages
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