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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2021, Vol. 15 Issue (2) : 461-477    https://doi.org/10.1007/s11709-021-0705-0
RESEARCH ARTICLE
Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method
Shuangxi FENG1, Huayang LEI1,2,3(), Yongfeng WAN1, Haiyan JIN4, Jun HAN4
1. Department of Civil Engineering, Tianjin University, Tianjin 300354, China
2. Coast Civil Structure Safety of Education Ministry, Tianjin University, Tianjin 300354, China
3. Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-rural Seismic Resilience, CEA, Tianjin 300354, China
4. China Railway 16th Bureau Group the 5th Engineering Co., LTD, Tangshan 064000, China
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Abstract

Many uncertain factors in the excavation process may lead to excessive lateral displacement or over-limited internal force of the piles, as well as inordinate settlement of soil surrounding the existing bridge foundation. Safety control is pivotal to ensuring the safety of adjacent structures. In this paper, an innovative method is proposed that combines an analytic hierarchy process (AHP) with a finite element method (FEM) to reveal the potential impact risk of uncertain factors on the surrounding environment. The AHP was adopted to determine key influencing factors based on the weight of each influencing factor. The FEM was used to quantify the impact of the key influencing factors on the surrounding environment. In terms of the AHP, the index system of uncertain factors was established based on an engineering investigation. A matrix comparing the lower index layer to the upper index layer, and the weight of each influencing factor, were calculated. It was found that the excavation depth and the distance between the foundation pit and the bridge foundation were fundamental factors. For the FEM, the FE baseline model was calibrated based on the case of no bridge surrounding the foundation pit. The consistency between the monitoring data and the numerical simulation data for a ground settlement was analyzed. FE simulations were then conducted to quantitatively analyze the degree of influence of the key influencing factors on the bridge foundation. Furthermore, the lateral displacement of the bridge pile foundation, the internal force of the piles, and the settlement of the soil surrounding the pile foundation were emphatically analyzed. The most hazardous construction condition was also determined. Finally, two safety control measures for increasing the numbers of support levels and the rooted depths of the enclosure structure were suggested. A novel method for combining AHP with FEM can be used to determine the key influencing aspects among many uncertain factors during a construction, which can provide some beneficial references for engineering design and construction.

Keywords deep foundation pit excavation      adjacent bridge foundation      influencing factors      analytic hierarchy process      finite element     
Corresponding Author(s): Huayang LEI   
Just Accepted Date: 18 March 2021   Online First Date: 22 April 2021    Issue Date: 27 May 2021
 Cite this article:   
Shuangxi FENG,Huayang LEI,Yongfeng WAN, et al. Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method[J]. Front. Struct. Civ. Eng., 2021, 15(2): 461-477.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-021-0705-0
https://academic.hep.com.cn/fsce/EN/Y2021/V15/I2/461
Fig.1  Index system determined by AHP.
target layer criteria layer weight index layer weight
influencing factors of deep foundation pit excavation on adjacent bridge foundation groundwater and soil engineering characteristics 0.152 groundwater 0.0431
soil density 0.0748
internal friction angle 0.0232
cohesive force 0.0116
retaining structure system ?0.0872 stiffness of retaining structure 0.0471
enclosure depth rooted in soil 0.0259
retaining structure style 0.0142
internal support system ?0.0369 stiffness of internal support 0.0051
numbers of internal support 0.0101
elevation location 0.0189
layout 0.0027
size of foundation pit 0.419 plane size 0.224?
excavation depth 0.161?
shape of pit 0.0346
stability of foundation pit ?0.0201 integral stability ?0.00902
anti-uplift stability ?0.00171
stability against tilting ?0.00582
anti-slip stability ?0.00271
seepage resistance stability ??0.000782
surrounding environment of foundation pit 0.283 distance from pit to bridge foundation 0.2267
overloading on the ground 0.0283
Tab.1  Total ranking of influencing factors
Fig.2  Layout drawing of engineering project.
Fig.3  Layout of the steel sheet pile support structure of the foundation pit: (a) support structure facade layout; (b) support structure layout.
Fig.4  Deformation development of steel sheet pile under different construction steps.
Fig.5  FE model baseline of foundation pit.
soil layer natural density of soil (kg/m3) tangent modulus (kPa) unloading modulus (kPa) initial void ratio cohesive force (kPa) internal friction angle (°) dilatancy angle (°)
clay 1.6 2000 1×104 1.02 5 25 0
silty clay 1.7 8000 36000 0.97 10 35 0
gravelly granite 1.7 43×103 129×103 0.62 1 34 4
gravelly silty clay 1.7 20×103 60×103 0.73 3 30 0
Tab.2  Parameters of each soil layer
structure plate thickness (m) unit weight (kN/m3) modulus of elasticity (kN/m2) moment of inertia in Z direction Iz (m4) moment of inertia in Y direction Iy (m4) Poisson’s ratio shear modulus (kN/m2)
steel sheet pile 0.0155 58.5 210×106 0.3 80.77×106
inclined bracing 0.013? 78.5 210×106 0.28×10−3 0.28×10−3
ring beam ?0.02195 78.5 210×106 0.669×10−3 0.224×10−3
Tab.3  Parameters of enclosure structure and internal support system
Fig.6  Deformation contour of foundation pit: (a) excavation depth to 1 m; (b) support at 0.5 m; (c) excavation depth to 3.5 m; (d) support at 3 m; (e) excavation depth to 6 m.
Fig.7  Deformation of steel sheet pile compared with measured value and predicted value.
numerical simulation condition number excavation depth (m) distance between the foundation pit and the bridge foundation (m) construction steps
1 5 2.5 Stage 1: initial in-situ stress balance;
Stage 2: adding existing railway subgrade;
Stage 3: drilling bored piles and steel sheet piles at the bottom of foundation pit;
Stage 4: setting up the first lateral support;
Stage 5: foundation pit excavation (combined with excavation depth);
Stage 6: pile cap construction.
2 5
3 7.5
4 7.5 2.5
5 5
6 7.5
7 9 2.5
8 5
9 7.5
Tab.4  Numerical simulation plan
Fig.8  Model established by FE considering the key influencing factors.
Fig.9  Influenced zone of excavation considering the key influencing factors: (a) excavation depth of 9 m and distance of 2.5 m; (b) excavation depth of 9 m and distance of 5.0 m; (c) excavation depth of 9 m and distance of 7.5 m; (d) excavation depth of 5.0 m and distance of 2.5 m; (e) excavation depth of 7.5 m and distance of 2.5 m; (f) excavation depth of 9.0 m and distance of 2.5 m.
Fig.10  Lateral displacement of the pile in X-direction under different excavation depths for different distances from foundation pit to bridge foundation: (a) distances of 2.5 m; (b) distances of 5 m; (c) distances of 7.5 m.
spacing (m) excavation depth (m) maximum axial force(kN) maximum positive shear (kN) maximum negative shear (kN) maximum positive moment (kN·m) Maximum negative moment (kN·m)
2.5 5 307.51 146.18 −210.77 936.43 −1.51
7 317.35 188.68 −234.15 1235.21 −1.49
9 334.23 259.46 −251.96 1546.36 −1.67
5 5 276.23 106.31 −198.69 693.57 −1.56
7 291.09 118.06 −212.38 900.11 −1.63
9 303.01 149.52 −224.52 1161.29 −1.8
7.5 5 271.96 101.21 −180.25 532.01 −1..61
7 272.53 104.1 −193.87 669.83 −1.71
9 276.65 112.46 −195.36 685.41 -3.46
Tab.5  Maximum internal force under excavation depths and distances between foundation pit and bridge foundation
Fig.11  Settlement of soil around pile foundation under different excavation depths for different distances from foundation pit to bridge foundation: (a) distances of 2.5 m; (b) distances of 5 m; (c) distances of 7.5 m.
Fig.12  Lateral displacement of the pile in X-direction under different support level numbers.
excavation depth (m) support numbers maximum axial force (kN) maximum positive shear (kN) maximum negative shear (kN) maximum positive moment (kN·m) maximum negative moment (kN·m)
9 3 334.23 ?259.46 −251.96 1546.36 ?−1.67
4 296.9? 240.3 −190.65 1569.58 −14.92
5 289??? 241.9 −170.02 1000.12 −12.73
6 236.46 101.9 −157.28 ?478.76 ?−1.33
Tab.6  Maximum internal force under different support numbers and rooted depths of enclosure structures
Fig.13  Settlement of soil around pile foundation under different support level numbers.
Fig.14  Lateral displacement of the pile in X-direction under different rooted depths of the enclosure structure.
excavation depth (m) rooted depth of enclosure structure
(m)
maximum axial force(kN) maximum positive shear (kN) maximum negative shear (kN) maximum positive moment (kN·m) maximum negative moment (kN·m)
9 10 334.23 259.46 −251.96 1546.36 −1.67
12 311.47 211.04 −239.51 1519.75 0
15 276.8 200.18 −212.8 1492.13 −10.13
Tab.7  Maximum internal force under different support numbers and rooted depths of enclosure structures
Fig.15  Settlement of soil around the pile foundation under different rooted depths of the enclosure structure.
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