Design of artificial ground freezing for an access tunnel of a railway station in Switzerland
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Date
2019-04-24
Publication Type
Conference Paper
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Abstract
The paper presents the static and thermal design of an artificial ground
freezing (AGF) measure with brine for an access tunnel of a railway station in central
Switzerland. The geology of the first 45 m of the access tunnel consist of sediments
(silty sand to sandy silt) followed by sandstone. The tunnel crosses under the railway
lines and train platforms of one of the train stations with the highest traffic. At any
time during construction of the tunnel traffic of trains cannot stopped. Due to the sediments
aforementioned and since the water table lies slightly above the crown of the
tunnel, AGF is the only suitable auxiliary measure for the tunnel. For achieving an
adequate frozen body above the crown water table must be raise up by watering the
ground locally with drains. The paper presents also the dimensioning and optimization
of these drains. The strength parameters were estimated from literature and verified with
uniaxial tests with frozen soil samples under constant temperature. Due to project
requirements the core of the tunnel is also frozen. Implementation of the AGF measures
starts from a shaft. Due to spatial conditions given by the location of reinforcement of
the diaphragm wall of the shaft and of a reinforcement beam the distribution of the
freeze pipes was demanding. The goals of the thermal design were the generation of a
frozen body with uniform thickness around the tunnel and to avoid generation of excess
pore pressure in the core of the tunnel during freezing.
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Publication status
published
External links
Book title
Tunnels and Underground Cities. Engineering and Innovation Meet Archaeology, Architecture and Art: Proceedings of the WTC 2019 ITA-AITES World Tunnel Congress
Journal / series
Volume
Pages / Article No.
1479 - 1488
Publisher
CRC Press
Event
45th ITA-AITES General Assembly and World Tunnel Congress (WTC 2019), Naples, Italy, May 3-9, 2019
Edition / version
1st Edition
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03655 - Anagnostou, Georgios (emeritus) / Anagnostou, Georgios (emeritus)