7 5 Vol. 7 2011 10 Chinese Journal of Underground Space and Engineering Oct. 2011 * 1 1 2 1 1. 200072 2. 200062 U455. 43 A 1673-0836 2011 05-0884 - 06 Numerical Simulation Analysis on Ground Settlements Caused by Multi-line Shield Tunnel Xiao Xiao 1 Zhang Mengxi 1 Wu Huiming 2 Zhang Zhiguo 1 1. Department of Civil Engineering Shanghai University Shanghai 200072 China 2. Shanghai Tunnel Engineering Co. Ltd Shanghai 200062 China Abstract Considering the complex four line overlapped form which lies in the subway No. 11 shield tunnel interval from Xu Jia-hui station to Shanghai indoor stadium 3-D finite element method is used to simulate the excavation process. Using some methods such as model change and reduplicated elements to simulate the soil excavation shield thrusting segment assembles and grouting hardening to analyse the strata deformation caused by tunnel shield construction. Then the ground settlement caused by multiline overlapped shield construction passing through the area with existed tunnel is analysed. It can be concluded that the maximum ground settlement will be affected by the position of shield machine when two tunnels construction have been completed the location of maximum value of ground settlement will be changed compared with that by one tunnel construction. The research results could be helpful to the regional protection technology of multi-line overlapped shield tunnel construction and served as theoretical basis. Keywords tunneling engineering shield tunneling multi-line overlapped type ground settlement three-dimensional finite element method 1 * 2011-07-25 1985- E-mail xiaoxiao8808@ 163. com 41172238
2011 5 885 1 2 Soliman 1993 1 Addenbrooke Potts 1996 2 2002 3 2005 4 Chehade Shahrour 2008 5 1 2009 6 Fig. 1 Plan view for construction site 1. 82 m 2009 7 1. 69 m 965 m 2006 8 6. 0 m 2 M4 1 M2 9 ~ 11 2 Fig. 2 Section of the position relationship for tunnels
886 7 1 Fig. 1 Soil parameters γ kn /m 3 E s MPa μ c kpa φ 1 0. 8 18. 3 26. 5 16. 0 4. 52 0. 33 2 2. 2 18. 5 26. 0 17. 0 4. 48 0. 32 3 3 17. 4 10. 0 16. 5 2. 54 0. 32 4 5. 8 16. 7 11. 0 12. 5 2. 09 0. 33 5 1 0. 5 17. 8 14. 0 14. 5 3. 36 0. 26 5 1a 3. 8 18. 2 5. 0 33. 0 8. 21 0. 24 5 1 2. 9 17. 8 14. 0 14. 5 3. 36 0. 26 5 3 7. 5 18. 1 16. 0 22. 5 4. 66 0. 29 3 3. 1 3 z 120 m 8 y 144 m x 95 m 5 Fig. 4 4 3. 2 Schematic diagram of folium elements 10-4 m 3 5 Fig. 3 Grid figure of the whole model Fig. 5 Schematic diagram of simulation steps 3. 3 75 955 1 000 959 1 004 6 4
2011 5 887 8 1 065 6 Fig. 8 Transverse settlements due to tunneling for the upline ring No. 1 065 Fig. 6 Schematic diagram of the selected position on the transverse ground 1 004 3. 2 mm 1 1 004 959 7 1 025 1. 7 mm 955 3. 2 mm 1 000 2. 0 mm 1 000 955 1. 2 mm 955 1 000 45 m 0. 25 mm 7 Fig. 7 5. 11 mm 1 004 1 025 Transverse settlements due to tunneling for the up-line ring No. 1 025 8 1 065 955 3. 5 mm 1 000 2. 4 mm 1 000 955 1. 1 mm 2 9 Fig. 9 9 1 029 10 959 Fig. 10 4. 9 mm 1 029 Transverse settlements due to tunneling for the down-line ring No. 1 029 10 1 069 959 1 069 Transverse ground settlements due to tunneling for the down-line ring No. 1 069
888 7 4. 65 mm 0. 5 mm 13 1 065 11 Fig. 13 Longitudinal settlements due to tunneling for the Fig. 11 Schematic diagram of the selected position up-line ring No. 1 065 on the longitudinal ground 968 2. 53 mm 3 1 052 0. 14 mm 4 1 065 1 069 60 m 11 14 x y Fig. 14 12 985 2010 6 30 7 00 Fig. 12 Longitudinal settlements due to tunneling for the up-line ring No. 985 2 12 985 2 980 1 040 1 045 1. 06 mm 13 1. 45 mm 1 028 1 065 1. 03 mm 1 005 3. 2mm 950 14 Schematic diagram of the longitudinal monitoring points 1 070
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