Intelligent feedback analysis on a deep excavation for the gravity anchorage foundation of a super suspension bridge

doi:10.13722/j.cnki.jrme.2018.0711

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摘要 In order to ensure the construction safety of the 38.5 m deep excavation for the gravity anchorage foundation of Fuma Yangtze River Bridge，an intelligent feedback analysis was applied to this excavation project. First，a three-dimensional numerical model that simulating the construction process of the excavation was built，and the deformations of the supporting structures were calculated by the finite difference program FLAC3D. Then，the non-linear mapping relationship between the geomechanical parameters and the excavation-induced displacements was established by the back-propagation neural network(BPNN). Last，the geomechanical parameters were optimized intelligently by the genetic algorithm(GA) based on the developed BPNN model and the measured displacements，and the deformations during the subsequent excavation stages were predicted based on the back-calculated parameters. The research results showed that：the back-calculated values of E1，μ1，c1，and φ1 of the completely weathered stratum，and E2 of the heavily weathered stratum were greater than the initial values，while the inversion value of E3 of the moderately weathered stratum was smaller than the initial value. The magnitudes and the variation tendencies of the predicted displacements were in good accordance with the measured displacements. At the end of the excavation，the retaining piles and the top beams had a maximum displacement of 15–20 mm，exhibiting a quite small magnitude as comparing with other case histories. Local concentration of shear stress mainly occurred at the soil-pile interface and at the toe of the excavation slope，and the plastic zones mainly appeared in the completely weathered stratum. After the completion of the excavation，there were no yielding elements in the model，and the convergence of the numerical computation was achieved，indicating the excavation was in a stable state. This study lays the basis for the subsequent construction and operation of the bridge，and offers a significant reference for the feedback analysis of similar anchorage excavation projects.

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	RAN Tao1
	2
	LIU Daan1
	2
	MEI Songhua3
	WANG Weiwei4
	TAN Lihua4

关键词 ： foundations, suspension bridge, anchorage, deep excavation, parameter inversion, deformation prediction, intelligent feedback analysis

Abstract：In order to ensure the construction safety of the 38.5 m deep excavation for the gravity anchorage foundation of Fuma Yangtze River Bridge，an intelligent feedback analysis was applied to this excavation project. First，a three-dimensional numerical model that simulating the construction process of the excavation was built，and the deformations of the supporting structures were calculated by the finite difference program FLAC3D. Then，the non-linear mapping relationship between the geomechanical parameters and the excavation-induced displacements was established by the back-propagation neural network(BPNN). Last，the geomechanical parameters were optimized intelligently by the genetic algorithm(GA) based on the developed BPNN model and the measured displacements，and the deformations during the subsequent excavation stages were predicted based on the back-calculated parameters. The research results showed that：the back-calculated values of E1，μ1，c1，and φ1 of the completely weathered stratum，and E2 of the heavily weathered stratum were greater than the initial values，while the inversion value of E3 of the moderately weathered stratum was smaller than the initial value. The magnitudes and the variation tendencies of the predicted displacements were in good accordance with the measured displacements. At the end of the excavation，the retaining piles and the top beams had a maximum displacement of 15–20 mm，exhibiting a quite small magnitude as comparing with other case histories. Local concentration of shear stress mainly occurred at the soil-pile interface and at the toe of the excavation slope，and the plastic zones mainly appeared in the completely weathered stratum. After the completion of the excavation，there were no yielding elements in the model，and the convergence of the numerical computation was achieved，indicating the excavation was in a stable state. This study lays the basis for the subsequent construction and operation of the bridge，and offers a significant reference for the feedback analysis of similar anchorage excavation projects.

Key words： foundations suspension bridge anchorage deep excavation parameter inversion deformation prediction；intelligent feedback analysis

引用本文:

RAN Tao1，2，LIU Daan1，2，MEI Songhua3，WANG Weiwei4，TAN Lihua4. Intelligent feedback analysis on a deep excavation for the gravity anchorage foundation of a super suspension bridge[J]. 岩石力学与工程学报, 2019, 38(S1): 2898-2912.
RAN Tao1，2，LIU Daan1，2，MEI Songhua3，WANG Weiwei4，TAN Lihua4. Intelligent feedback analysis on a deep excavation for the gravity anchorage foundation of a super suspension bridge. , 2019, 38(S1): 2898-2912.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0711 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2898

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