Effect of Geosynthetic Reinforcements on Load Transfer Mechanism of Pile-supported Low Embankments Under Cyclic Loading
In soft soil regions,roadbeds are prone to problems such as pavement cracking and uneven settlement under a long-term cyclic traffic loading.Pile-supported embankments are one of the most commonly used structures for ground modification in soft soil areas.It is crucial to investigate their dynamic responses for a better control of long-term embankment settlements under traffic loading.The existing research is primarily focused on high embankments under static loading,with limited studies on the working performances of low embankments under cyclic loading.Two model tests were conducted in this study to investigate the influences of geosynthetic reinforcements on the load transfer mechanism of pile-supported low embankments under cyclic loading.The embankment settlement,pile efficacy,and stress-strain distribution were analyzed.The results indicate that pile-supported low embankments exhibit significant cumulative deformations under cyclic loading,where the reinforcement facilitates the reduction in the development of cumulative settlements.The cumulative settlement of reinforced low embankments decreases by 24.5％under the conditions of this study.The pile efficacy of pile-supported low embankments under cyclic loading gradually decreases with the increase in the number of load cycles before stabilization.The reinforcement increases the pile efficacy and reduces the magnitude of efficacy degradation.The pile efficacy of unreinforced low embankments continuously decreases under higher loading amplitudes and cycles,while that of reinforced embankments increases slowly.Unreinforced low embankments form a partial arching earlier under static loading,and gradually degrade with the application of cyclic loading,while the reinforced embankments exhibit an improvement in stress redistribution phenomena.Based on the experimental results,a method to define pile-supported low embankments under cyclic loading is proposed,and an evaluation of the working performances of low embankments is conducted based on the pile efficacy reduction factors.
subgrade engineeringevolution of soil archingload transfer mechanismpile-suppor-ted embankmentscyclic loadinggeosynthetic reinforcement
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