Abstract
A shaking table test for a bridge foundation reinforced with the front and back rows of anti-slide piles on a gravel soil slope was designed. The test results were obtained by loading El Centro waves with different peak accelerations. It was not an advantage for the deformation of bridge pile foundation while the distance between the front-row anti-slide piles and pier was large. The back-row anti-slide piles played a major role in seismic reinforcement, and the peak bending moment of the pile shaft and the peak earth pressure behind the pile had a triangular distribution. The distance from the crack to the sliding surface of the anti-slide pile was approximately one fifth of the length of the anchoring section. As the crack propagated, the bearing capacity of the pile shaft decreased gradually. Since the influence of pier inertia force and soil horizontal thrust, a peak negative bending moment and a peak positive bending moment were observed near the pile top and the sliding surface respectively. The rate of attenuation of the bending moment from the top of the pile along its depth was related to the resistance of the soil around the pile. The stress-induced deformation of the pile foundation behind the pier was larger than that in front of the pier. The peak ground acceleration (PGA) amplification factor of the slope had a vertical amplification effect and a layered distribution. The acceleration responses of the sliding section and the steep slope section were strong, while the acceleration responses of the region between the bridge pier and the back-row anti-slide piles were weak. With the increase in the vibration intensity, the soil damping ratio increased and the PGA amplification factor decreased. The feasibility of analyzing the acceleration response of the slope model by the two-dimensional equipotential map was experimentally verified.
Highlights
In mountains and valleys frequently prone to earthquakes, many bridge pile foundations are constructed on potential landslide slopes and need to be reinforced through the design of seismic support structures
Performed a shaking table test to study a cut slope of the Yuxi–Mengzi railway which was reinforced by double-row anti-slide piles
The volume of gravel soil landslide is about 840,000 m3, the peak value of regional ground motion acceleration is 0.2 g, and the characteristic period of the ground motion response spectrum is 0.45 s. It is a typical landslide with a high risk of geological disasters. This study took this site as a prototype, and a shaking table model test was conducted on the bridge foundation reinforced with the front and back rows of anti-slide piles on the gravel soil slope
Summary
In mountains and valleys frequently prone to earthquakes, many bridge pile foundations are constructed on potential landslide slopes and need to be reinforced through the design of seismic support structures. The pattern of the dynamic interaction between the bridge foundation and the rear anti-slide piles was analyzed, the spectral response characteristics subjected to seismic waves was summarized, and the variation pattern of the peak ground acceleration (PGA) amplification factor and the landslide thrust of a silty clay slope was obtained. It is a typical landslide with a high risk of geological disasters This study took this site as a prototype, and a shaking table model test was conducted on the bridge foundation reinforced with the front and back rows of anti-slide piles on the gravel soil slope. The results revealed the dynamic response characteristics of the front and back rows of and gravel soil slope, and provided the necessary technical references for the seismic reinforcement anti-slide piles, pier pile foundation, and gravel soil slope, and provided the necessary technical design of a bridge foundation on a gravel soil slope.
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