Large-scale shaking table test on seismic behaviour of anti-slide pile-reinforced bridge foundation and gravel landslide
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ORIGINAL PAPER
Large-scale shaking table test on seismic behaviour of anti-slide pile-reinforced bridge foundation and gravel landslide: a case study Chonglei Zhang 1,2
&
Guanlu Jiang 3 & Da Lei 3 & Aamir Asghar 1 & Lijun Su 1,2 & Zhimeng Wang 4
Received: 3 April 2020 / Accepted: 9 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study aimed to illustrate the seismic response and instability process of a double-row anti-slide pile-reinforced bridge foundation and gravel landslide. Selecting the gravel slope of Jiuzhai Valley along the under-construction Chengdu-Lanzhou high-speed railway as the site prototype, large-scale shaking table tests were first conducted at a similitude ratio of 1:70, with sine waves and El Centro waves as the seismic wave inputs. The amplitudes of the input seismic waves were increased, while the acceleration, dynamic earth pressure, and strain distribution were monitored in the gravel landslide. The dynamic response patterns of anti-slide pile-reinforced bridge foundations in gravel landslides were illustrated. The front-row and back-row antislide piles should be a reasonable distance from the bridge foundation. The response acceleration manifested an elevation amplification effect with an increasing elevation in the slope behind the anti-slide piles. Back-row anti-slide piles reinforcing the bridge foundation can reduce the effect of landslide thrust on the bridge foundation and maintain a uniform distribution of earth pressure behind the bridge foundation, mitigating seismic effects. The dynamic earth pressure peaked at the top of the bridge foundation and then decreased along the depth. The back-row anti-slide piles displayed greater resonance coupling and unloading effects before and after reaching the load-carrying limit, respectively. In seismic strengthening design involving bridge foundations and gravel landslides, when the earthquake-induced resonance coupling effect on inclined, loosely packed land masses is fully considered, pre-reinforcement measures (e.g., high-pressure grouting and anchor spraying) should be carried out on the gravel slopes. Keywords Acceleration . Anti-slide piles . Bridge foundation . Seismic behaviour . Landslide
Introduction Earthquake-induced landslides are one of the major postearthquake geological disasters that occur in mountainous areas (Cui et al. 2009; Huang et al. 2017; Gorum et al. 2011). In recent years, the integrated seismic survey for
detecting the landslide and the influences of landslide evolution on high-speed railway (HSR) projects have been gradually investigated (Grit and Kanli 2016; Pando et al. 2020). The Chengdu-Lanzhou HSR (Chenglan HSR) along the eastern edge of the Qinghai-Tibet Plateau is under construction and is situated in an alpine valley region with active neotectonics
* Lijun Su [email protected]
Zhimeng Wang [email protected] 1
Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS),
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