砂土地震液化判别及碎石桩加固设计参数优化
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摘要
本文运用FLAC3D作为计算工具对江苏某滩涂匡围工程的天然地基和采用碎石桩加固的复合地基进行动力反应分析,探讨了砂土地基在地震作用下的孔隙水压力的变化和碎石桩桩长、桩间距、桩径等设计参数对消散动孔隙水压力、控制液化的影响.分析结果表明:超孔压比可以作为地基土液化的判别依据;为满足碎石桩的抗液化性能和工程经济性要求,可采用长短桩间隔布置、控制桩间距以及不同桩径相结合等措施.本文取得的成果可为同类工程的设计建设提供参考.
Through analyzing dynamic response to natural foundation and stone column composite foundation of a beach polder project in Jiangsu province,China,this paper discusses the changes in pore water pressure of sand foundation under earthquake action and the influence of stone columns design parameters on anti-liquefaction and dissipating pore water pressure.The results show that the excess pore pressure ratio can be used as criterion for determining soil liquefaction.Combining the pile length,controlling pile spacing and adopting different pile diameters,etc.measures can meet columns' anti-liquefaction performance and techno-economic requirements.The results can provide a reference for the design and construction of similar projects.
Through analyzing dynamic response to natural foundation and stone column composite foundation of a beach polder project in Jiangsu province,China,this paper discusses the changes in pore water pressure of sand foundation under earthquake action and the influence of stone columns design parameters on anti-liquefaction and dissipating pore water pressure.The results show that the excess pore pressure ratio can be used as criterion for determining soil liquefaction.Combining the pile length,controlling pile spacing and adopting different pile diameters,etc.measures can meet columns' anti-liquefaction performance and techno-economic requirements.The results can provide a reference for the design and construction of similar projects.
引文
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[2]李空军,杨勇新,林建华,等.饱和砂土液化机理分析及其抗液化措施[J].基建优化,2006,27(3):83-85.
[3]陈育民,徐鼎平.FLAC/FALC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[4]钱家欢,殷宗泽.土工原理与计算[M].2版.北京:中国水利水电出版社,1996.
[5]史宏彦,谢定义.饱和砂土液化判别准则的探讨[J].西北水资源与水工程,2000,11(3):16-21.
[6]卢廷浩.土力学[M].2版.南京:河海大学出版社.2005.
[7]陈勇华.土体压缩模量、变形模量和弹性模量的讨论[J].城市建设,2010(16):135-136.
[8]顾宝和,张荣祥,石兆吉.地震液化效应的综合评价[J].工程地质学报,1995(3):1-10.
[9]张艳美,张鸿儒.碎石桩设计参数对复合地基抗液化性能的影响[J].岩土力学,2008,29(5):1320-1324,1333.
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