饱和黄土地区CFG桩复合地基承载特性有限元分析
|
摘要
以西部管道工程兰州原油末站为工程背景,运用ANSYS有限元软件分别研究了不同荷载、褥垫层厚度、桩体模量及桩径对饱和黄土地区中CFG桩复合地基沉降的影响。结果表明:沉降随着荷载的增加而增大,桩间土荷载分担比随着荷载的增加逐渐减小,而桩荷载分担比逐渐增大;承台的沉降随褥垫层厚度增加略有增加,桩顶沉降却略有减小,且当褥垫层厚度相同时,桩土应力比随着荷载的增加而增大,在相同荷载下,桩土应力比随着褥垫层厚度的增加而减小,沉降与桩体模量的变化关系类似于玻尔兹曼函数;沉降随桩径的增大而减小。
Based on the Lanzhou crude oil terminal station of western pipeline project,in this paper,the effects of load,cushion thickness,pile modulus and pile diameter on the settlement of CFG pile composite foundation in saturated loess area.are studied by using ANSYS finite element software.The results show that the settlement increases with the increase of load,the load-sharing ratio between pile space soil decreases with the increase of load and the load-sharing ratio of pile increases.The settlement of the cap increases slightly with the increase of the cushion thickness,but the settlement of the pile top decreases slightly.When the cushion thickness is the same,the pile-soil stress ratio increases with the increase of the load and the pile-soil stress ratio decreases with the increase of cushion thickness under the same load.The relationship between the settlement and the modulus of the pile is similar to the Boltzmann function and the settlement decreases with the increase of the diameter of the pile.
Based on the Lanzhou crude oil terminal station of western pipeline project,in this paper,the effects of load,cushion thickness,pile modulus and pile diameter on the settlement of CFG pile composite foundation in saturated loess area.are studied by using ANSYS finite element software.The results show that the settlement increases with the increase of load,the load-sharing ratio between pile space soil decreases with the increase of load and the load-sharing ratio of pile increases.The settlement of the cap increases slightly with the increase of the cushion thickness,but the settlement of the pile top decreases slightly.When the cushion thickness is the same,the pile-soil stress ratio increases with the increase of the load and the pile-soil stress ratio decreases with the increase of cushion thickness under the same load.The relationship between the settlement and the modulus of the pile is similar to the Boltzmann function and the settlement decreases with the increase of the diameter of the pile.
引文
[1]龚晓南.复合地基理论及工程应用[M].北京:中国建筑工业出版社,2002.GONG X N.Theory of Composite Foundations and Engineering Applications[M].Beijing:China Architecture&Building Press,2002.
[2]叶观宝,高彦斌.地基处理[M].3版.北京:中国建筑工业出版社,2009.YE G B,GAO Y B.Foundation Treatment[M].3rd ed.Beijing:China Architecture&Building Press,2009.
[3]阎明礼,张东刚.CFG桩复合地基技术及工程实践[M].北京:中国水利水电出版社,2001.YAN M L,ZHANG D G.CFG Pile Composite Foundation Technology and Engineering Practice[M].Beijing:China Water&Power Press,2001.
[4]龚晓南.复合地基设计和施工指南[M].北京:人民交通出版社,2003.GONG X N.Guide of Composite Foundation Design and Construction[M].Beijing:China Communications Press,2003.
[5]杨克己,韩理安.实用桩基工程[M].北京:人民交通出版社,2004.YANG K J,HAN L A.Practical Pile Foundation Engineering[M].Beijing:China Communications Press,2004.
[6]叶书麟.地基处理[M].北京:中国建筑工业出版社,1998.YE S L.Foundation Treatment[M].Beijing:China Architecture&Building Press,1998.
[7]叶观宝.地基加固新技术[M].北京:机械工业出版社,2002.YE G B.New Technology of Foundation Reinforcement[M].Beijing:Machinery Machine Press,2002.
[8]张建伟,原华,孔德志.CFG桩复合地基褥垫层效用的有限元分析[J].岩土工程学报,2011,33(增刊2):460-463.ZHANG J W,YUAN H,KONG D Z.Finite element analysis of cushion in CFG pile composite foundation[J].Chinese Journal of Geotechnical Engineering,2011,33(S2):460-463.
[9]周爱军,栗冰.CFG桩复合地基褥垫层的试验研究和有限元分析[J].岩土力学,2010,31(6):1803-1808.ZHOU A J,LI B.Experimental study and finite element analysis of cushion of cushion in CFG pile composite foundation[J].Rock and Soil Mechanics,2010,31(6):1803-1808.
[10]薛新华,魏永幸,杨兴国,等.CFG桩复合地基室内模型试验研究[J].中国铁道科学,2012,33(2):7-13.XUE X H,WEI Y X,YANG X G,et al.Indoor model test study on CFGpile composite foundation[J].China Railway Science,2012,33(2):7-13.
[11]董必昌,郑俊杰.CFG桩复合地基沉降计算方法研究[J].岩石力学与工程学报,2002,21(7):1084-1086.DONG B C,ZHENG J J.Study on the settlement calculation of CFG pile composite ground[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(7):1084-1086.
[12]曾俊铖,张继文,童小东,等.高速铁路CFG桩复合地基应力特性试验研究[J].铁道学报,2011,33(5):91-96.ZENG J C,ZHANG J W,TONG X D,et al.In-situ test of stress characteristics of CFG pile composite foundation of high-speed railway[J].Journal of the China Railway Society,2011,33(5):91-96.
[13]李宁,韩煊.褥垫层对复合地基承载机理的影响[J].土木工程学报,2001,34(2):68-73.LI N,HAN X.Study on mechanism of cushion in composite pile foundation[J].China Civil Engineering Journal,2001,34(2):68-73.
[14]黄生根.CFG桩复合地基现场试验及有限元模拟分析[J].岩土力学,2008,29(5):1275-1279.HUANG S G.Test study and finite element analysis of CFG composite foundation[J].Rock and Soil Mechanics,2008,29(5):1275-1279.
[15]任鹏,邓荣贵,于志强.CFG桩复合地基试验研究[J].岩土力学,2008,29(1):81-86.REN P,DENG R G,YU Z Q.Experimental research on composite foundations with CFG piles[J].Rock and Soil Mechanics,2008,29(1):81-86.
[16]王兵,杨为民,李占强,等.褥垫层对复合地基承载特性影响的试验研究[J].岩土力学,2008,29(2):403-408.WANG B,YANG W M,LI Z Q,et al.Test study on influence of cushion on loading behavior of composite foundations[J].Rock and Soil Mechanics,2008,29(2):403-408.
[17]王旭,张延杰,蒋代军,等.饱和黄土区CFG桩与振动沉管碎石桩复合地基承载特性试验研究[J].岩土工程学报,2013,35(增刊2):1603-1607.WANG X,ZHANG Y J,JIANG D J,et al.Experimental research on bearing features of CFG pile composite ground and vibrating sinktube detritus pile composite ground on saturated loess[J].Chinese Journal of Geotechnical Engineering,2013,35(S2):1603-1607.
[18]朱伯芳.有限单元法原理与应用[M].北京:水利水电出版社,1979.ZHU B F.The Finite Element Method Theory and Applications[M].Beijing:China Water&Power Press,1979.
[19]李黎明.ANSYS有限元分析实用教程[M].北京:清华大学出版社,2005:26-27.LI L M.ANSYS Finite Element Analysis Practical Tutorial[M].Beijing:Tsinghua University Press,2005:26-27.
[2]叶观宝,高彦斌.地基处理[M].3版.北京:中国建筑工业出版社,2009.YE G B,GAO Y B.Foundation Treatment[M].3rd ed.Beijing:China Architecture&Building Press,2009.
[3]阎明礼,张东刚.CFG桩复合地基技术及工程实践[M].北京:中国水利水电出版社,2001.YAN M L,ZHANG D G.CFG Pile Composite Foundation Technology and Engineering Practice[M].Beijing:China Water&Power Press,2001.
[4]龚晓南.复合地基设计和施工指南[M].北京:人民交通出版社,2003.GONG X N.Guide of Composite Foundation Design and Construction[M].Beijing:China Communications Press,2003.
[5]杨克己,韩理安.实用桩基工程[M].北京:人民交通出版社,2004.YANG K J,HAN L A.Practical Pile Foundation Engineering[M].Beijing:China Communications Press,2004.
[6]叶书麟.地基处理[M].北京:中国建筑工业出版社,1998.YE S L.Foundation Treatment[M].Beijing:China Architecture&Building Press,1998.
[7]叶观宝.地基加固新技术[M].北京:机械工业出版社,2002.YE G B.New Technology of Foundation Reinforcement[M].Beijing:Machinery Machine Press,2002.
[8]张建伟,原华,孔德志.CFG桩复合地基褥垫层效用的有限元分析[J].岩土工程学报,2011,33(增刊2):460-463.ZHANG J W,YUAN H,KONG D Z.Finite element analysis of cushion in CFG pile composite foundation[J].Chinese Journal of Geotechnical Engineering,2011,33(S2):460-463.
[9]周爱军,栗冰.CFG桩复合地基褥垫层的试验研究和有限元分析[J].岩土力学,2010,31(6):1803-1808.ZHOU A J,LI B.Experimental study and finite element analysis of cushion of cushion in CFG pile composite foundation[J].Rock and Soil Mechanics,2010,31(6):1803-1808.
[10]薛新华,魏永幸,杨兴国,等.CFG桩复合地基室内模型试验研究[J].中国铁道科学,2012,33(2):7-13.XUE X H,WEI Y X,YANG X G,et al.Indoor model test study on CFGpile composite foundation[J].China Railway Science,2012,33(2):7-13.
[11]董必昌,郑俊杰.CFG桩复合地基沉降计算方法研究[J].岩石力学与工程学报,2002,21(7):1084-1086.DONG B C,ZHENG J J.Study on the settlement calculation of CFG pile composite ground[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(7):1084-1086.
[12]曾俊铖,张继文,童小东,等.高速铁路CFG桩复合地基应力特性试验研究[J].铁道学报,2011,33(5):91-96.ZENG J C,ZHANG J W,TONG X D,et al.In-situ test of stress characteristics of CFG pile composite foundation of high-speed railway[J].Journal of the China Railway Society,2011,33(5):91-96.
[13]李宁,韩煊.褥垫层对复合地基承载机理的影响[J].土木工程学报,2001,34(2):68-73.LI N,HAN X.Study on mechanism of cushion in composite pile foundation[J].China Civil Engineering Journal,2001,34(2):68-73.
[14]黄生根.CFG桩复合地基现场试验及有限元模拟分析[J].岩土力学,2008,29(5):1275-1279.HUANG S G.Test study and finite element analysis of CFG composite foundation[J].Rock and Soil Mechanics,2008,29(5):1275-1279.
[15]任鹏,邓荣贵,于志强.CFG桩复合地基试验研究[J].岩土力学,2008,29(1):81-86.REN P,DENG R G,YU Z Q.Experimental research on composite foundations with CFG piles[J].Rock and Soil Mechanics,2008,29(1):81-86.
[16]王兵,杨为民,李占强,等.褥垫层对复合地基承载特性影响的试验研究[J].岩土力学,2008,29(2):403-408.WANG B,YANG W M,LI Z Q,et al.Test study on influence of cushion on loading behavior of composite foundations[J].Rock and Soil Mechanics,2008,29(2):403-408.
[17]王旭,张延杰,蒋代军,等.饱和黄土区CFG桩与振动沉管碎石桩复合地基承载特性试验研究[J].岩土工程学报,2013,35(增刊2):1603-1607.WANG X,ZHANG Y J,JIANG D J,et al.Experimental research on bearing features of CFG pile composite ground and vibrating sinktube detritus pile composite ground on saturated loess[J].Chinese Journal of Geotechnical Engineering,2013,35(S2):1603-1607.
[18]朱伯芳.有限单元法原理与应用[M].北京:水利水电出版社,1979.ZHU B F.The Finite Element Method Theory and Applications[M].Beijing:China Water&Power Press,1979.
[19]李黎明.ANSYS有限元分析实用教程[M].北京:清华大学出版社,2005:26-27.LI L M.ANSYS Finite Element Analysis Practical Tutorial[M].Beijing:Tsinghua University Press,2005:26-27.