夯实水泥土桩复合地基动力特性和时程响应影响因素分析
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摘要
采用爆破地震动模拟天然地震动的方式对足比尺夯实水泥土桩复合地基进行现场动力试验研究。在空载时对天然地基和夯实水泥土桩复合地基的动力特性和时程响应进行了分析;对单桩和群桩复合地基分别在脉动和爆破作用下的动力特性和时程响应进行了分析。研究了爆破作用下,单桩和群桩复合地基峰值加速度、最大水平位移的变化规律;夯实水泥土桩在不同荷载条件下主频的变化规律;为探讨动力荷载作用下水泥土桩复合地基的承载和变形特性提供了研究基础。
Dynamic property experiments of full scale rammed soil-cement pile composite foundation are conducted by means of simulating natural earthquake through blast earthquake.With no load applied,the dynamic characteristics and time-history responses of natural foundation and rammed soil-cement pile composite foundation are analyzed firstly.Then the dynamic characteristics and time-history responses of single pile and group-piles rammed soil-cement pile composite foundation are analyzed under static load and explosions respectively.The horizontal displacement and the peak acceleration of single-pile and group-piles composite foundation under blast earthquake action are studied,as well as the variation frequencies under different load conditions.This research provides references for the later study of bearing capacity and deformation characteristics of rammed soil-cement pile under dynamic load.
Dynamic property experiments of full scale rammed soil-cement pile composite foundation are conducted by means of simulating natural earthquake through blast earthquake.With no load applied,the dynamic characteristics and time-history responses of natural foundation and rammed soil-cement pile composite foundation are analyzed firstly.Then the dynamic characteristics and time-history responses of single pile and group-piles rammed soil-cement pile composite foundation are analyzed under static load and explosions respectively.The horizontal displacement and the peak acceleration of single-pile and group-piles composite foundation under blast earthquake action are studied,as well as the variation frequencies under different load conditions.This research provides references for the later study of bearing capacity and deformation characteristics of rammed soil-cement pile under dynamic load.
引文
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[2]章定文,刘松玉.水泥土桩复合地基动力效应研究进展[J].地震工程与工程振动,2006,2(26):149―155.Zhang Dingwen,Liu Songyu.The state of art of dynamic analysis of soil-cement columns composite foundation[J].Earthquake Engineering and Engineering Vibration,2006,2(26):149―155.(in Chinese)
[3]Sitar N,Clough G W.Seismic response of steep slope in cemented soils[J].Journal of Geotechnical Engineering Division of the ASCE,1998,109(GT2):210―227.
[4]Chiang Y C,Cha Y S.Dynamic properties of cement treated soils[R].National Academy of Sciences,Highway Research Record,1972,379:39―51.
[5]丁继辉.水泥土和CFG组合桩复合地基动力特性分析[J].粉煤灰综合利用,2008,6:37―40.Ding Jihui.Dynamic characteristic analysis on composite foundation with soil-cement piles and CFG piles[J].Fly Ash Comprehensive Utilization,2008,6:37―40.(in Chinese)
[6]陈善民,王立忠,李挺.水泥土动力特性室内试验及复合地基抗震特性分析[J].浙江大学学报(工学版),2000,34(4):398―403.Chen Shanmin,Wang Lizhong Li Ting.The indoor test of Cement-soil dynamic characteristics and analysis of seismic charact-eristics of composite foundation[J].Zhejiang University Journal(Engineering Edition),2000,34(4):398―403.(in Chinese)
[7]王维玉.CFG桩复合地基动力特性和时程响应影响因素分析[J].岩土工程学报,2010,增2:115―118.Wang Weiyu.Effects on dynamic characteristics and response of Cement-fly ash-gravel pile composite foundation[C].Journal of Geotechnical Engineering Supplement,2010,S2:115―118.(in Chinese)
[8]赵拓.爆破荷载作用下CFG桩复合地基动力特性试验研究[J].公路交通科技(应用技术版),2010(07):121―122.Zhao Tuo.Under blasting loads the dynamic characteristic experiment of cement-fly ash-gravel pile composite foundation[J].Highway Traffic Technology(Applied Technique),2010(07):121―122.(in Chinese)
[9]Robert L.Weigel.Earquake engineering[M].U.S.A:Prentice-Hall,1970.
[10]GB50007-2002,建筑地基基础设计规范[S].北京:中国筑工业出版社,2002.GB50007-2002,Code for design of buildng foundation[S].Beijing:China Architecture Inndustry Press,2002.(in Chinese)
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