Centrifuge and Numerical Simulation of Pile Supported Slab Track System Behavior on Soft Soil under Seismic Loading
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1885-1
Geotechnical Engineering
Centrifuge and Numerical Simulation of Pile Supported Slab Track System Behavior on Soft Soil under Seismic Loading Jinsun Lee
a
, Il-Wha Leeb, Yun Wook Choo
c
, and Mintaek Yoo
d
a
Member, Dept. of Civil and Environmental Engineering, Wonkwang University, Iksan 54538, Korea Member, Advanced Infrastructure Research Team, Korea Railroad Research Institute, Uiwang 16105, Korea c Member, Dept. of Civil and Environmental Engineering, Kongju National University, Cheonan 31080, Korea d Member, Railroad Structure Research Team, Korea Railroad Research Institute, Uiwang 16105, Korea b
ARTICLE HISTORY
ABSTRACT
Received 22 October 2019 Revised 13 May 2020 Accepted 1 July 2020 Published Online 10 September 2020
Piles installed to increase bearing capacities of super structures in soft soil layers are vulnerable to horizontal loads such as seismic loads. This study aims to verify the stability of piles used for a pile supported slab track system using dynamic centrifuge test and numerical analysis. First of all, validation of the numerical analysis method was performed by comparing the seismic response from the two methods: dynamic centrifuge test and its numerical model. Verifications were also obtained for four different centrifuge test model setups. Numerical models were designed similar to the physical models on a prototype scale. The numerical method solves the dynamic problem by an explicit method in the time-integration stage. The acceleration response of the slab track and bending moment of the pile show good agreement between the two methods. Based on the verified numerical analysis model, the parametric studies for embankment thickness and soft ground stiffness were performed, in addition, the seismic stability of pile supported slab track was evaluated.
KEYWORDS Numerical analysis Pile supported slab track Dynamic centrifuge test Dynamic analysis Soil-structure interaction
1. Introduction Most of piles on the soft soil layer are designed to support vertical loads. Thus, a safety check for unexpected horizontal loads is another task to consider when designing infrastructures. The most common lateral load on piles is seismic load. Designing piles for seismic loading conditions can be executed with the following existing design process for other horizontal loads, such as wind, current, and waves. However, there are many parameters to be defined for the existing design procedure. For example, the non-linear P-Y curve and the group effect of piles are the representative parameters to define. In addition to the above parameters, another effect to be considered for seismic loading is the kinematic interaction between the soil and piles. In contrast with static and steady-state loadings, seismic and transient loads may invoke inertial forces on the soil medium. Thus, the response of the pile depends not only on the superstructure but also on the surrounding soils. Many preceeded work attempted to es
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