hidcon – elements in tunnelling - solexperts...stress σ hidcon ® - element concrete hidcon® –...
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Strain ε
Str
ess
σ
hiDCon ® - Element
Concrete
hiDCon® – Elements in Tunnelling
Yielding sprayed concrete lining of high bearing capacity
Modular Yielding Support in swelling rock
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Material
High strength concrete matrix with
porous aggregates
Reinforcement
Steel fibres, stirrups, rings and plates
Principle
Successive closure of the pores and
prevention of lateral strain (e*)
hiDCon beam elements for sprayed concrete lining hiDCon foundation elements hiDCon anchor elements
hiDCon® – High Deformable Concrete
Element types
High ductility combined with high stress level
Strain ε
Str
ess
σ
ε* : 35 - 55 %
σ* : 5 - 25 N/mm2
Beams
Sprayed concrete lining
Cylinder
Foundation elements
Stamping cylinder
Anchor heads
2
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Yielding Sprayed Concrete Lining – Squeezing Rock
Yielding sprayed concrete lining with hiDCon elements and TH steel ribs Prefabricated beam elements
Stress-strain diagram
Quality Control, Production
Assumptions:
circular profile / n: number of elements / e*: element deformation 50 %
p
u
R
dh
Sprayed concrete strength at 7 days
Sprayed concrete strength at 2 days
100
5
10
15
25
20
30
35
20 30 40 50
Deformation ε in %
Str
ess
σ in
N/m
m2
Lining resistance
Maximum radial displacement
p ≈ s * · dR
u ≈ n ·h 14·p
3
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Lötschberg Base Tunnel
Mitholz Carbonaceous Formation / Element dimensions: 200 x 200 x 880 mm
8 Elements per cross section
s * = 10 N/mm² / e* ≈ 50 %
hiDCon beam elements: Mitholz Carbonaceous Formation
Deformed element St. Martin la Porte (Source: Razel, Bilfinger Berger, Pizarotti)
Access tunnel St. Martin la Porte / Element dimensions: 200 x 400 x 750 mm
n = 9 elements per cross section
s * = 7 N/mm² / e* ≈ 50 %
Lyon-Turin-Ferroviaire Base Tunnel
Deformed initial profile
hiDCon® – Elements in Tunnelling
hiDCon
hiDCon
4
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Heave zone in Chienberg Road Tunnel (Switzerland)
Heave zone Chienberg Road Tunnel, Switzerland (Source: Aegerter & Bosshardt AG)
Accessible yielding zone
Maintenance with no restriction on
tunnel operations
Elements individually exchangeable
Modular Yielding Support – Heavily Swelling Rock
hiDCon foundation elements
hiDCon anchor elements
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hiDCon foundation elements
hiDCon foundation elements, Chienberg Road Tunnel: Height 100 cm / ø 90 cm
TYPE (depending on overburden) TYPE 1 TYPE 2 TYPE 3
Load under the longitudinal beams in MN/m 3.0 4.0 5.0
Load on each foundation element in MN 4.5 6.0 7.5
Yield stress s * for foundation elements in N/mm² 7.1 11.8
Deformation capacity e * in % 40 35 30
Force-deformation diagram: Trial tests on anchor elements hiDCon anchor elements
hiDCon anchor elements, Chienberg Road Tunnel: Height 60 cm / ø 60 cm / ø Plate 35 cm
Maximum working load in anchor
100
200
400
600
800
1200
1000
1400
1600
1800
2000
20 30 40 50
Deformation e in %Forc
e F
in k
N
Heave zone Chienberg Road Tunnel (Switzerland)
hiDCon® – Designed & Produced by Solexperts AG
www.solexperts.com
Solexperts France SARLTechnopôle Nancy-Brabois10 allée de la Forêt de la Reine54500 Vandœuvre les NancyFrance
Tél. +33 (0) 3 83 94 04 55Fax +33 (0) 3 83 94 03 [email protected]
Solexperts AGMettlenbachstrasse 25P.O. Box 818617 MönchaltorfSwitzerland
Tel +41 (0) 44 806 29 29Fax +41 (0) 44 806 29 [email protected]