1、 U 25 A 1000 7598(2019)06 2213 08 Analysis for vertical earth pressure transference on overlaying soils of shield tunnel under uniform surface surcharge HUANG Da-wei1,ZHOU Shun-hua2,FENG Qing-song1,LUO Kun1,LEI Xiao-yan1,X U Y ou-ju n3(1.Engineering Research Center of Railway Environmental Vibration
2、 and Noise of Ministry of Education,East China Jiaotong University,Nanchang,Jiangxi 330013,China;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804,China;3.School of Civil Engineering,Inner Mongolia University of Science and Technology,Bao
3、tou,Inner Mongolia 014010,China Abstract:Scaled model test for the influence on an existing shield tunnel induced by surface surcharge is carried out,and vertical earth pressure and soil settlement for the stratum above the shield tunnel are analyzed.Results show that under uniform surface surcharge
4、,the less of the vertical distance from the top of the tunnel,the more extent for the nonuniform vertical earth pressure in the stratum above the shield tunnel,and the more extent for the nonuniform soil settlement of overlaying soils of the shield tunnel.The overlaying soils show vertical earth pre
5、ssure transference for vertical shearing force among soil elements,which is induced by vertical relative movement among soil elements as the stratum above the shield tunnel has nonuniform soil settlement,so the vertical earth pressure in the stratum above the shield tunnel is nonuniform.As vertical
6、shearing force among soil elements for overlaying soils is related to vertical relative movement among soil elements and soil mechanical property,the extent of nonuniform vertical earth pressure in the stratum above the shield tunnel is affected by the extent of nonuniform soil settlement and soil m
7、echanical property of overlaying soils when the tunnel suffers from surface surcharge,so the tunnel deformation is influenced.Keywords:shield tunnel;surface surcharge;additional earth pressure;settlement;convergent deformation 1 1 23 2214 2019 Boussinesq Westerguard 49 4 1011 12 13 14 2 2.1 1 10 15
8、16 3 15 0.8 1.4 1.7 g/cm3 10 kPa 20 kPa 0.35 0.85 2.65 MPa 3.5 8.5 26.5 MPa15 1 3 mm 30 mm 250 mm 90 2(a)2(b)9 15 1 mm Fig.1 Distribution of earth pressure sell(unit:mm)(a)(b)2 Fig.2 Earth settlement test 2.2 3 D D=0.62 m 2.75D 34 kPa 3(a)3(b)34 kPa 34 kPa 3(c)6 2215 34 kPa 3(c)34 kPa 17 3 4 5 0.5D
9、1D(a)1(b)2(c)3 3 Fig.3 Vertical earth pressure at the top of tunnel under different overlaying soil depths(a)1(b)2(c)3 4 0.5D Fig.4 Vertical earth pressure at the position that is 0.5D from the top of tunnel under different overlaying soil depths(a)1(b)2(c)3 5 1D Fig.5 Vertical earth pressure at the
10、 position that is 1D from the top of tunnel under different overlaying soil depths 051015202503 06 09 01 2 0/kPa/cm1.25D 1.5D 1.75D2D 2.25D 2.5D2.75D051015202502 04 06 08 01 0 01 2 0/kPa/cm1.25D 1.5D 1.75D 2D2.25D 2.5D 2.75D0 5 101520253003 06 09 01 2 0/kPa/cm1.25D 1.5D 1.75D 2D 2.25D 2.5D 2.75D0510
11、15202530354003 06 09 01 2 0/kPa/cm0.75D 1D 1.25D1.5D 1.75D 2D2.25D 2.5D 2.75D051015202530354002 04 06 08 01 0 01 2 0/kPa/cm0.75D 1D 1.25D1.5D 1.75D 2D2.25D 2.5D 2.75D0 5 101520253035404503 06 09 01 2 0/kPa/cm0.75D 1D 1.25D1.5D 1.75D 2D2.25D 2.5D 2.75D01020304050 4 0 2 002 04 06 08 01 0 01 2 0/kPa/cm
12、0.25D 0.5D 0.75D 1D1.25D 1.5D 1.75D 2D2.25D 2.5D 2.75D0102030405060 4 0 2 002 04 06 08 01 0 01 2 0/kPa/cm0.25D 0.5D 0.75D 1D1.25D 1.5D 1.75D 2D2.25D 2.5D 2.75D010203040506040 20 0 20 40 60 80 100 120/kPa/cm 0.25D 0.5D 0.75D 1D 1.25D 1.5D 1.75D 2D 2.25D 2.5D 2.75D 2216 2019 3 3 5 2.3 6 1 2 3 1 2 7 8
13、0.5D 1D 6 6 8(a)1(b)2(c)3 6 Fig.6 Soil settlement at the top of the tunnel(a)1(b)2(c)3 7 0.5D Fig.7 Soil settlement at the position that is 0.5D from the top of tunnel(a)1(b)2(c)3 8 1D Fig.8 Soil settlement at the position that is 1D from the top of the tunnel 18 15 12 9 6 3 0120 80 40 0 40 80 120/m
14、m/cm1.5D 2D 2.5D 2.75D76543210120 80 40 0 40 80 120/mm/cm1.5D 2D 2.5D 2.75D30 25 20 15 10 5 0120 80 40 0 40 80 120/mm/cm 1D 1.5D 2D2.5D 2.75D 18 15 12 9630 120 80 40 0 40 80 120/mm/cm1D 1.5D 2D2.5D 2.75D876543210120 80 40 0 40 80 120/mm/cm1D 1.5D 2D2.5D 2.75D403530252015105 0120 80 40 0 40 80 120/mm
15、/cm 1D 1.5D 2D2.5D 2.75D2520151050120 80 40 0 40 80 120/mm/cm1D 1.5D 2D2.5D 2.75D6543210120 80 40 0 40 80 120/mm/cm1D 1.5D 2D2.5D 2.75D25 20 15 10 5 0120 80 40 0 40 80 120/mm/cm 1.5D 2D2.5D 2.75D 6 2217 3 5 3 3.1 1 9(a)9(a)1 2 9(b)1 1 2 2 2 3 n(a)(b)9 Fig.9 Analysis for vertical earth pressure trans
16、ference on overlaying soils of the shield tunnel n n+1 1 1 0 9(b)18 1 2 1 1 1 0 1 2 1 2 1 2 1 2 2 3 12 2 1 2 1 2 2 3 12 2 6 8 9(b)234 3 4 2 2 2 1 6 8 2218 2019 2 1 2 1 1 2 2 2 1 10(a)1 10(b)2 3(a)4(a)5(a)0 10(b)hq hq 2 3 2 1 3 1 2 3 9(b)10(c)(a)(b)(c)10 Fig.10 Diagram for vertical earth pressure dis
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