Post on 28-Mar-2015
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Numerical Simulation of Earthworks and Retaining System for an Excavation
F. Geiser and S. CommendGeoMod ing. conseils SA
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Introduction
• Offices and commercial building
• Lausanne region
• 120 x 35(max) x 9.3 m
Numerical modelling: 3D numerical simulation (Z_Soil)30’000 continuum elements
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Slurry wall
Geometry: structural elements
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Hydrogeotechnical conditions
9.3 m
8.0 m
3.5 mRemblai
Glacio-sableux
Glacio-argileux mou
Fluvio-glaciaire
Glacio-argileux
Moraine
412.7 msm = 0.0
Molasse imperméable Puits de décharge
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
Piles
T = 0. Etat initial
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Piles realisation
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Slurry wall realisation
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 1. Excavation globale jusqu’à -3.0 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 2. Excavation zone A à -7.0 m, puis étayage à -2.5 m
zone A
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 3. Excavation du reste à -7.0 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 3.2. Excavation zone A jusqu’à -9.3 m (f.f.)
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 3.4. Excavation de la moitié du reste jusqu’à -9.3 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 3.6. Sous-radier à -9.3 m sur la moitié de la surface
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Excavation stages
T = 5
T = 4. Excavation du reste à -9.3 m, puis fin du sous-radierT = 5. Application des charges de service du bâtiment
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: final horizontal displacements
uz
A
B
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: horizontal displacements evolution
-0.01
0
0.01
0.02
0.03
0.04
0.05
0 1 2 3 4 5
Etape
Dép
lace
men
t [m
]
Point A Point B
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: final horizontal displacements
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: final vertical displacements
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: forces in the bracing
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: moments in the slurry wall
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Results: moments in the slurry wall
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : particular study
15 m
17.2 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : simplified 3D model
9.3 m
8.0 m
3.5 mRemblai K = 10-5 m/s épaisseur = 3.5 à 7.5 m
Glacio-sableux K = 10-5 m/s épaisseur = 4 m
Glacio-argileux mou K = 10-10 m/s épaisseur = 7.6 m
Fluvio-glaciaire K = 10-3 m/s épaisseur = 3.7 m
Glacio-argileux K = 10-8 m/s épaisseur = 4 m
Moraine K = 10-9 m/s épaisseur = 6 m
412.7 msm = 0.0
Molasse imperméable Well (model with/without) K = 10-3 m/s e= 15 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : simplified 3D model with well
A = 15 * 17.2 = 258 m2
0.0-25
.0-50
.0
-100.0 -75.0 -50.0 -25.0 0.0
FLUID VELOCITIESt = 4.0 [day] Z_SOIL.PC 2003 v.6.26 Expert License No: -------- Company : ZACE Author : ZACE Date : 2007-02-15 09:46:01 File : C:\Mandats\GeoMod\M686_Orange\Technique\14fev\2D\orange_coupeCFF_2x2_paroiBeam_puits_Eunl_OKTitle : Zsoil example
3.207e+00
EXTR-VX5.131e+00-9.283e-01
EXTR-VY4.483e+00-2.413e+00
MAX-VEL.5.157e+00
UNIT[m/day]
Coupe 2D avec tranchées drainantesTranche 3D avec puits, esp. = 15 m
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : simplified 3D model
eClay – low permeability
Model Thickness of the « impermeable »
layer
Well Flow in the excavated area
( 258 m2)
Flow for the entire
excavation (3200 m2)
Simple 1 5.30 m Yes 65.7 m3/d 815 m3/d
Simple 2 5.30 m No 2.4e-3 m3/d 30 litres/d
Simple 3 1.35 m No 9.7e-3 m3/d 120 litres/d
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : 3D model
Low permeability
High permeability
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : 3D model
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : 3D model
1625 m3 / jour
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Water : 3D model
0.04 m3 / jourImpermeable wall
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Impermeable wall
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Temperature effect on bracing : 2D modelgeneral considerations for T = 30 °
Free truss: l = T L/2 = 5 mm
Fixed conditions F = 1000 kN
Imposed displacement F = 165 kN
0.0
-7.5
-15
.0
-7.5 0.0 7.5 15.0
DEFORMED MESHt-ref.= 4.0 [day] t = 5.0 [day] Z_SOIL.PC 2003 v.6.26 Expert License No: -------- Company : ZACE Author : ZACE Date : 2007-03-08 08:29:12 File : C:\Mandats\GeoMod\M686_Orange\Technique\14fev\2D\orange_coupeCFF_2x2_paroiBeam_puits_Eunl_OK_deltaU5mmTitle : Zsoil example
2.771e-03
EXTR-U4.022e-04-5.849e-03
EXTR-V9.101e-04-9.855e-04
MAX-DISP5.896e-03
UNIT[m]
ux imposé = - 5 mmux = - 4.2 mm
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Temperature effect on bracing : 2D modelimposing T on bracing (Q4)
0.0
-5.0
-10
.0
-5.0 0.0 5.0 10.0 15.0
TEMPERATUREt = 2.0 [day] Z_SOIL.PC 2003 v.6.26 Expert License No: -------- Company : ZACE Author : ZACE Date : 2007-03-08 09:14:18 File : C:\Mandats\GeoMod\M686_Orange\Technique\Simple_heat\orange_coupeCFF_heat2Title : Zsoil example
0 1.000e+01
1 1.150e+01
2 1.300e+01
3 1.450e+01
4 1.600e+01
5 1.750e+01
6 1.900e+01
7 2.050e+01
8 2.200e+01
9 2.350e+01
10 2.500e+01
11 2.650e+01
12 2.800e+01
13 2.950e+01
14 3.100e+01
15 3.250e+01
16 3.400e+01
17 3.550e+01
18 3.700e+01
19 3.850e+01
20 4.000e+01
UNIT[C]
T : from 10 °C to 40 °C => T = 30 °C
T = 10 °C = cte
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Temperature effect on bracing : 2D modelimposing T on bracing
0.0
-7.5
-15
.0
-15.0 -7.5 0.0 7.5 15.0
DEFORMED MESHt-ref.= 1.0 [day] t = 2.0 [day] Z_SOIL.PC 2003 v.6.26 Expert License No: -------- Company : ZACE Author : ZACE Date : 2007-03-08 10:39:04 File : C:\Mandats\GeoMod\M686_Orange\Technique\Simple_heat\orange_coupeCFF_heat+mech2Title : Zsoil example
1.885e-03
EXTR-U4.055e-04-6.979e-03
EXTR-V7.084e-03-1.010e-03
MAX-DISP7.084e-03
UNIT[m]
ux = 0 (imposed)
N=230 kN
Commend, Mellal, Geiser – 08.2007
Z_Soil Day 2007Lausanne, 27th August 2007
Conclusions
Currently under construction
•Predictions in the range of deformations and forces
•Horizontal displacements slightly > measurements•Linked mainly to:
- « conservative » evaluation of and c- real water behaviour