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The Shaking Table Test on the Performance of Cement-mixed Piles in Liquefiable Railway Foundations
ZHAO Mengyi1, XIE Qiang1, CAO Xinwen2, ZHAO Wen1
1.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
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 cement-mixed 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. Cement-mixed 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.
关键词:  Liquefaction  Cement-mixed pile  Railway  Shaking table test
DOI:10.19743/j.cnki.0891-4176.201901007
分类号:
基金项目:This project is sponsored by the Railway's Research and Development Project of the Ministry of Railways of the People's Republic of the China:Study on Special Subgrade Construction Technology in High Intensity Earthquake Area of the Yuxi-Mengzi Railway.
The Shaking Table Test on the Performance of Cement-mixed Piles in Liquefiable Railway Foundations
ZHAO Mengyi1, XIE Qiang1, CAO Xinwen2, ZHAO Wen1
1.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China;2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract:
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 cement-mixed 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. Cement-mixed 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.
Key words:  Liquefaction  Cement-mixed pile  Railway  Shaking table test