砂桩加固可液化地基的振动台试验研究
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摘要
饱和砂土地震液化问题是岩土地震工程中一个重要的研究课题,利用振动台在室内开展相关研究是一种行之有效的方法.利用小型振动台模型试验研究散体材料加固可液化地基,得出不同桩距下孔隙水压力的变化规律,探讨不同桩距对抗液化效果的评价.试验表明,桩距在3～3.5桩径时,孔隙水压力最小,抗液化效果最佳;而且得出浅层土比深层土更易液化的结论.建议在实际设计中桩距取3～3.5桩径,并且长短桩结合使用,既能取得良好的加固效果又能降低工程造价.
Liquefaction of saturated sands remains an important topic in geotechnical earthquake engineering.Anindoor Shaking table model experiment is an effective method for studging liquefaction of saturated sands.With such a smale vibration table in the test for studying the liquified ground which is rein-forced with loose materid like the sand pile,the variation regularities of pore-water pressure at diffcrent pile distance as well as the assessment on the effectiveness of liquifaction resistance of pile distance can be arrived at.The experiment also indicated that the pressure of pore-water remains the lowest and liquifaction resistance the best at a pile distance spacing of 3～3.5 pile diameters.As a resuer,the soil at the shallow depth is more easily liquified that at a deeper depth.The paper further proposed that the 3～3.5 pile diameter spacing be adopted for the pile distace.Moreover,both short and long pile showed be used in combiuation so as not only to produce better reinforcing effect but also to reduce the cost of the project.
Liquefaction of saturated sands remains an important topic in geotechnical earthquake engineering.Anindoor Shaking table model experiment is an effective method for studging liquefaction of saturated sands.With such a smale vibration table in the test for studying the liquified ground which is rein-forced with loose materid like the sand pile,the variation regularities of pore-water pressure at diffcrent pile distance as well as the assessment on the effectiveness of liquifaction resistance of pile distance can be arrived at.The experiment also indicated that the pressure of pore-water remains the lowest and liquifaction resistance the best at a pile distance spacing of 3～3.5 pile diameters.As a resuer,the soil at the shallow depth is more easily liquified that at a deeper depth.The paper further proposed that the 3～3.5 pile diameter spacing be adopted for the pile distace.Moreover,both short and long pile showed be used in combiuation so as not only to produce better reinforcing effect but also to reduce the cost of the project.
引文
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[2]杨庆陶.桩体加固液化砂土的振动台试验研究[D].太原:太原理工大学,2008.YANG Qing-tao.Experimental on pile body reinforcement liquef-ication sandy soil shake table[D].Taiyuan:Taiyuan University of Technology,2008.
[3]吴永娟,牛琪瑛,闫卫泽.短桩加固液化砂土时孔压比随桩距变化规律分析[J].太原理工大学学报,2008,39(6):613-615.WU Yong-juan,NIU Qi-ying,YAN Wei-ze.Analysis with the pile is apart from the change rule of stub reinforce-ment liquefication sandy soil the hole pressure compares along[J].Journal of Taiyuan University of Technology,2008,39(6):613-615.
[4]李立军,牛琪瑛,梁仁旺.碎石排水桩抗地震液化的试验研究与理论分析[C]//第十八届全国结构工程学术会议,2009:283-288.LI Li-jun,NIU Qi-ying,LIANG Ren-wang,Experimental study and the oritical analysis on drainage on gravel pile resistance of earthquake liquefaction[C]//The18th National Conference on structural engineering,2009:283-288.
[5]张之颖,张新,吕西林.小强度振动台试验中的超孔隙水压力实测结果[J].西安建筑科技大学学报:自然科学版,2004,36(1):ZHANG Zhi-ying,ZHANG Xin,LXi-lin.Excessive pore water pressure of soft ground under minor shock[J]..J.Xi′an University of Architecture&Technology,2004,36(1):
[6]林本海,谢定义.振冲地基抗液化机理和检验方法的分析[J].建筑结构,1998,27(11):30-34.LIN Ben-hai,XIE Ding-yi.Analysis of Vibro-ground resistance mechanisms and inspection methods[J].Architec-tural structure,1998,27(11):30-34.
[7]林本海,谢定义.复合地基的液化检验理论及其应用[M]北京:中国水利水电出版社,1999:142-146.LIN Ben-hai,XIE Ding-yi.Examination theory and application on liquefaction of compound ground[M].Beijing:China Water Power Press,1999:142-146.
[8]郑建国.碎石桩复合地基液化判别方法的探讨[J].工程勘探,1999,12(2):5-7.ZHEN Jian-guo.Discussion of gravel pile liquefication distinction method[J].Engineering exploration,1999,12(2):5-7.
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