Large-scale shaking table test study on seismic performance of geocell retaining wall with tensioned tape
JIN Feifei1, 2, 3, SONG Fei1, 2, 3, HUANGFU Zhao1, 2, 3, SUN Chuandi1, 2, 3
(1. School of Highway Engineering, Chang?an University, Xi?an, Shaanxi 710064, China; 2. The Key Laboratory of Intelligent Construction and Maintenance of CAAC, Chang?an University, Xi'an, Shaanxi 710064, China; 3. Xi'an Key Laboratory of Geotechnical Engineering for Green and Intelligent Transport, Chang'an University, Xi'an, Shaanxi 710064, China)
Abstract:A large-scale shaking table model test was conducted to investigate the seismic performance of geocell retaining walls with and without ribbed bands. This study analyzed the changes in confining pressure, acceleration amplification factor, and horizontal displacement of the wall under earthquake action for both models by applying seismic waves with varying amplitudes, frequencies, directions, wave types, and durations. The results indicate that as amplitude increases, both the confining pressure and horizontal displacement of the two models gradually increase. Additionally, the acceleration amplification factor shows an amplifying effect along the height of the wall. When the frequency is below 4 Hz, both cell confining pressure and acceleration amplification factors are relatively low for each model, moreover, displacement decreases with increasing frequency. Conversely, when the frequency exceeds 4 Hz, all three factors gradually increase. The dynamic response of the retaining walls to XZ-directional vibrations is significant. Different types of seismic waves have varying effects on wall displacement, emphasizing the importance of considering regional seismic wave characteristics in seismic design. Holding time has minimal impact on the dynamic response of retaining walls. The seismic performance of the two models differs, with the reinforced retaining wall demonstrating superior performance. To enhance top stability, reinforcement tape should be placed at the top of the wall. The residual displacements of the two models are 32.58 and 30.32 mm, respectively, equivalent to 2.04% and 1.89% of the wall height, which do not meet the displacement failure criteria. Tensile strips can effectively reduce residual displacement and improve seismic performance. At an amplitude of 1.0 g, potential slip surfaces are observed in the unreinforced retaining wall but not in the reinforced one. Unreinforced retaining walls are suitable for areas with seismic fortification intensity not exceeding IX, while reinforced retaining walls can be used in areas with higher seismic intensity. These findings provide a basis for the seismic design and engineering application of geocell retaining walls.
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