2011 11 11 158 JOURNAL OF RAILWAY ENGINEERING SOCIETY Nov 2011 NO. 11 Ser. 158 1006-2106 2011 11-0052 - 06 200002 6 PLAXIS 3D Foundation HS TU 471 A Design and 3D Numerical Analysis of a Deep Excavation in Close Proximity to Sensitive Properties CHANG Lin - yue SHEN Jian XU Zhong - hua East China Architecture Design & Research Institute Co. Ltd. Shanghai 200002 China Abstract Research purposes With the increasing depth and size of the excavations as well as the more complex and sensitive surrounding environmental conditions more stringent deformation control requirements are needed for the excavation engineering. As a result accurate prediction of the deformation of the excavation and surrounding environments becomes very important. Research conclusions The design scheme of a deep excavation in close to 6 - storey brick residential building in Shanghai soft soil and the technical measures for surrounding environment projection are described in detail. Then the three - dimensional finite element model is established to simulate the influence of excavation on the adjacent buildings by PLAXIS 3D Foundation program. Calculated deformation of the retaining wall and the settlements of the adjacent buildings are in good agreement with the measured values. The influence of excavation on surrounding environments is effectively predicted by the proposed model and analysis method which provide an important reference for the design and construction. Key words deep excavation sensitive properties top - down method HS model 3D numerical analysis 2011-05 - 21 1983
53 1 2 3 4 5 PLAXIS 2D 1-5 6 1 m PLAXIS 3D Foundation 1 3 1 1. 1 28 6 4 2 400 mm 0. 50 ~ 0. 70 m 1 400 ~ 1 600 mm 5 660 m 2 1. 50 m 312 m 200 mm 0. 98 ~ 1. 15 m 7 18. 2 m 17. 2 ~ 17. 4 m 7 8. 9 ~ 9. 7 m 2 6 26 2. 1 6 1 1. 2 2. 2 125 m Q 2 Q 4
54 2011 11 1 000 mm 1 29. 25 m 38. 05 m 2 3 2 m 2. 5 1 2 29. 25 m 2. 3 0. 8 38. 05 m 1. 3 3 A850@ 600 1 10% 20% 2 A800@ 600 4 3 ~ 2. 4 5 0. 5 ~ 1. 0 m 7 8. 9 ~ 9. 7 m C60 17. 2 m 6 7 4L180 18
55 3 3. 1 Rinter 6 3 53 012 147 067 PLAXIS 3D Foundation 15 8 Goodman Mohr - Coulomb 6 4 5 5 4 3. 2 6 PLAXIS Hardening Soil HS 7 HS 8-9 1 1 /m γ / kn /m 3 E ref 50 /MPa E ref oed /MPa E ref ur /MPa c /kpa φ / v ur m K 0 R inter p ref /kpa 1 3. 3 18. 0 8 4 40 5 22 0. 2 0. 8 0. 625 0. 6 100 3 4 4. 2 17. 6 7. 2 3. 6 36 8. 5 19. 5 0. 2 0. 8 0. 666 0. 6 100 10. 4 16. 9 4 2 20 13. 5 12. 0 0. 2 0. 8 0. 792 0. 6 100 5 5. 8 18. 2 14 7 70 16. 0 16. 5 0. 2 0. 8 0. 716 0. 6 100 6 4. 3 19. 5 17 8. 5 85 30. 0 17. 5 0. 2 0. 8 0. 699 0. 6 100 7 1 6. 3 18. 6 20 10 100 2. 0 28. 5 0. 2 0. 5 0. 523 0. 8 100 7 2 28 18. 8 32 16 160 0 34. 0 0. 2 0. 5 0. 441 0. 8 100 γ E ref 50 p ref E oed ref E ref ur v ur c φ m K 0
56 2011 11 3. 3 2 2 1 2 3 4 5 6 7 8 3. 4 6 42. 5 mm 17. 2 m 0. 25% Wang 10 11 16 m 0. 9 16 m 7 6 mm 7 8 8 4 2 5 ~ 8 3. 5 9 12 m 0. 7
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