The Shaking Table Test on the Performance of Cement-mixed Piles in Liquefiable Railway Foundations

作者：ZHAO Mengyi,XIE Qiang,CAO Xinwen,ZHAO Wen

摘要：Cement-mixed piles, as countermeasure against liquefaction of silt and sand ground, can improve the shear strength and bearing capacity of foundation soil, meaning cement-mixed piles are capable of resisting displacement when an earthquake happens. However, investigations of cement-mixed piles by experimental methods such as the shaking table test is few and far between. It is especially true for the seismic performance of cement-mixed piles in liquefiable railway foundations in high seismic intensity regions. To this end, a cross-section of the Yuxi-Mengzi railway was selected as the prototype and studied by the shaking table test in this study. The results showed that composite foundation of cementmixed piles was not liquefied when the seismic acceleration was lower than 0. 30g. In the process of acceleration increasing from 0. 30g at 2Hz to 0. 60g at 3Hz, the upper middle silt outside slope toe was partly liquefied. The foundation soil under the shoulders and center of subgrade was far from the initial liquefaction criterion during the test. Cementmixed piles can effectively reduce the embankment settlement and differential settlement. It can be concluded that, the design of cement-mixed piles can ensure the seismic performance of the subgrade, and satisfy the seismic design requirements of the Yuxi- Mengzi railway in areas of VIII degrees seismic fortification intensity.

发文机构：Faculty of Geosciences and Environmental Engineering School of Civil Engineering

关键词：LIQUEFACTIONCement-mixedpileRAILWAYSHAKINGtabletest

分类号： P[天文地球]