Analysis of seismic behaviors of digging well foundation with prefabricated roots

Yi Wang, Xingchong Chen, Xiyin Zhang, Mingbo Ding, Jianqiang Gao, Jinhua Lu and Yongliang Zhang

Abstract

Digging well foundation has been widely used in railway bridges due to its good economy and reliability. In other instances, bridges with digging well foundation still have damage risks during earthquakes. In this study, a new type of digging well foundation with prefabricated roots was proposed to reduce earthquake damage of these bridges. Quasi-static tests were conducted to investigate the failure mechanism of the root digging well foundation, and then to analyze seismic behaviors of the new type well foundation. The testing results indicated that these prefabricated roots could effectively limit the rotation and uplift of the digging well foundation and increase the lateral bearing capacity of the digging well foundation. The elastic critical load and ultimate load can be increased by 69% and 36% if prefabricated roots were added in the digging well foundation. The prefabricated roots drived more soil around the foundation to participate in working, the stiffness of the bridge pier with root digging well foundation was improved. Moreover, the root participation could improve the energy dissipation capacity of soil-foundation-pier interaction system. The conclusions obtained in this paper had important guiding significance for the popularization and application of the digging well foundation with prefabricated roots in earthquake-prone zones.

Key Words

digging well foundation; experimental study; prefabricated root; railway bridge; seismic behavior

Address

Yi Wang: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Xingchong Chen: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Xiyin Zhang: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Mingbo Ding: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Jianqiang Gao: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Jinhua Lu: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China Yongliang Zhang: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China

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