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Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Numerical Simulation of Earthworks and Retaining System for an Excavation.

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Presentation on theme: "Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Numerical Simulation of Earthworks and Retaining System for an Excavation."— Presentation transcript:

1 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Numerical Simulation of Earthworks and Retaining System for an Excavation F. Geiser and S. Commend GeoMod ing. conseils SA

2 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 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) 30000 continuum elements

3 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Slurry wall Geometry: structural elements

4 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Hydrogeotechnical conditions 9.3 m 8.0 m 3.5 m Remblai Glacio-sableux Glacio-argileux mou Fluvio-glaciaire Glacio-argileux Moraine 412.7 msm = 0.0 Molasse imperméable Puits de décharge

5 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages Piles T = 0. Etat initial

6 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Piles realisation

7 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Slurry wall realisation

8 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 1. Excavation globale jusquà -3.0 m

9 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 2. Excavation zone A à -7.0 m, puis étayage à -2.5 m zone A

10 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007

11 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 3. Excavation du reste à -7.0 m

12 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 3.2. Excavation zone A jusquà -9.3 m (f.f.)

13 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 3.4. Excavation de la moitié du reste jusquà -9.3 m

14 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 3.6. Sous-radier à -9.3 m sur la moitié de la surface

15 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Excavation stages T = 5 T = 4. Excavation du reste à -9.3 m, puis fin du sous-radier T = 5. Application des charges de service du bâtiment

16 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: final horizontal displacements uz A B

17 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: horizontal displacements evolution

18 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: final horizontal displacements

19 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: final vertical displacements

20 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: forces in the bracing

21 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: moments in the slurry wall

22 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Results: moments in the slurry wall

23 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : particular study 15 m 17.2 m

24 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : simplified 3D model 9.3 m 8.0 m 3.5 m Remblai 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 imperméableWell (model with/without) K = 10 -3 m/s e= 15 m

25 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : simplified 3D model with well A = 15 * 17.2 = 258 m 2 Coupe 2D avec tranchées drainantes Tranche 3D avec puits, esp. = 15 m

26 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : simplified 3D model e Clay – low permeability ModelThickness of the « impermeable » layer WellFlow in the excavated area ( 258 m 2 ) Flow for the entire excavation (3200 m 2 ) Simple 15.30 mYes65.7 m 3 /d815 m 3 /d Simple 25.30 mNo2.4e-3 m 3 /d30 litres/d Simple 31.35 mNo9.7e-3 m 3 /d120 litres/d

27 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : 3D model Low permeability High permeability

28 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : 3D model

29 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : 3D model 1625 m 3 / jour

30 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Water : 3D model 0.04 m 3 / jour Impermeable wall

31 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Impermeable wall

32 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Temperature effect on bracing : 2D model general considerations for T = 30 ° Free truss:l = T L/2 = 5 mm Fixed conditionsF = 1000 kN Imposed displacementF = 165 kN ux imposé = - 5 mm ux = - 4.2 mm

33 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Temperature effect on bracing : 2D model imposing T on bracing (Q4) T : from 10 °C to 40 °C => T = 30 °C T = 10 °C = cte

34 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 27th August 2007 Temperature effect on bracing : 2D model imposing T on bracing ux = 0 (imposed) N=230 kN

35 Commend, Mellal, Geiser – 08.2007 Z_Soil Day 2007 Lausanne, 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


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