Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Author:

Yan Lei12,Gou Xiaoying1,Guo Zhengchao1,Zhang Xin1,Jiang Yu1,Ran Xingwen1,Chen Guanwen1,Yue Kefeng3

Affiliation:

1. School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China

2. School of Civil Engineering, Chongqing University, Chongqing 400045, China

3. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiao-Tong University, Chongqing 400074, China

Abstract

In view of the complexity of the pile foundation underpinning structure system and the stringent requirements of the construction process, this paper briefly describes the necessity of introducing epoxy resin reinforcing adhesive of planting rebar in the design of pile foundation underpinning beam structure to improve the mechanical properties of the reinforced beam new and old concrete joint surfaces and proposes a new type of pile foundation replacement beam system construction method by “chiseling + prestressed reinforcement + epoxy resin reinforcing adhesive”. This paper uses an actual pile foundation underpinning project of an urban overpass as a prototype, designs and creates a model structure with a similarity ratio of 1/6, and performs repeated progressive static loading tests to study the load carrying capacity, displacement change, and other properties of the strengthened replacement structure, as well as analyses and distorts the overall working performance and failure mode of them. On this basis, the prototype structure’s finite element analysis model was built, and the finite element analysis results were compared with the test results to obtain the mechanical properties and deformation characters of the actual pile foundation underpinning structure system corresponding to the actual underpinning beam load. This paper’s study can lay the theoretical and experimental foundation for the smooth development of similar projects.

Funder

General Program of China Postdoctoral Science Foundation

Natural Science Foundation of Chongqing, China

Scientific and Technological Research Program of Chongqing Municipal Education Commission

Wanzhou District Science and Technology Innovation Project

Chongqing Three Gorges Reservoir Bank Slope and Engineering Structure Disaster Prevention and Control Center Civil and Hydraulic Master’s Degree Open Fund

Cooperation projects between universities of Chongqing and institutes affiliated to the Chinese Academy of Sciences

Publisher

MDPI AG

Subject

General Materials Science

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3. Robison, M.S. (2010, January 5). Excavation Support and Micropile Underpinning in Vail, Colorado. Proceedings of the Biennial Geotechnical Seminar, Denver, CO, USA.

4. Design and Construction Planning for the Keage Underground Station on the Kyoto Tozai Line;Onuki;J. Tunn. Eng. JSCE,2011

5. Luo, H.C. (2014). Research on Initiative Underpinning Technology of Light Rail Bridge Columns under the Dynamic Load. [Master’s Thesis, Hebei University of Technology].

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