不同超载状态下深基坑支护结构的计算与分析
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摘要
深基坑开挖与支护是一个古老而又有时代特点的岩土工程课题,随着高层建筑物和高耸构筑物的不断兴建和发展,深基坑开挖支护技术的应用和研究日益重要,国内外很多学者在本领域进行了大量的研究,包括理论计算、设计方法、原位实测、室内模型试验等都取得了很多有意义的成果。但是,由于深基坑支护工程的复杂性和不确定性,该领域尚有许多值得继续研究和不断完善的地方。
本文以深圳丰盛町阳光地下街基坑工程为研究背景进行了相关的研究和分析,在总结以往研究成果的基础上,采用Midas GTS软件对深圳丰盛町阳光地下街深基坑工程的排桩支护体系进行了有限元模拟,分析时把土体、支护桩和内支撑系统看成一个空间三维整体,同时考虑了支护结构与土体的相互协调作用,计算了各种开挖工况下的支护体系受力和变形情况。通过与现场实测数据的对比分析得出:
(1)不同超载状态下,基坑支护体系的内力与变形的普遍规律;比如,有超载的基坑的内力与变形较无超载的要大。
(2)通过对三种不同超载状态的支护体系内力与变形的对比研究,得到一边超载一边无超载最不利超载状态下支护体系内力与变形,为今后类似工程的设计与施工提供一定的参考依据;
(3)在基坑开挖分析中考虑支护结构与土体相互作用,分析了基坑底部隆起、地表沉降问题。得到了基坑底部隆起、地表沉降等主要物理要素在上述几种不同超载状态下的变化规律。
文中围绕分步开挖过程中深基坑支护体系与土体应力和变形进行了较深入的研究,通过将数值模拟与现场实测数据进行对比分析,结果表明研究成果和测试数据基本吻合,说明文中研究成果是合理的,起到了施工超前预测、预报的效果,为丰盛町基坑工程提供了理论依据和指导,有助于提高深基坑的设计水平和安全性,并为类似工程的设计、施工和研究丰富和积累了宝贵的经验。
Deeping excavation and support is an old and who have the characteristics of the times of the geotechnical engineering topics. With the high-rise buildings and tall structures continuous to constuct and develop, deeping foundation pit excavation and support of technology and research have become increasingly important. Many overseas specialists have conducted series of research in this field, Including the theoretical calculation, design methods, measured in situ, indoor model test and made a lot of meaningful results. However, because of Deep Foundation Pit complexity and uncertainty, there is much merit in the field continue to study and improve.
This article has conducted the related research and the analysis taking Shenzhen sumptuous Chouyou light underground street hole excavated for building foundation project as the research background, In the summary formerly in research results' foundation, Midas GTS software has carried on the finite element simulation to Shenzhen sumptuous Chouyou light underground street deep pit excavated for building foundation project's piling supports and protections system, when the analysis the soil body, a guard stake and in supports the system to regard as a spatial three dimensional whole, simultaneously had considered the supports and protections structure and the soil body intercoordination function, calculated each kind to excavate under the operating mode the supports and protections system stress and the distortion situation
Through on-site comparison of the measured data analysis:
(1)、Different overloaded state, foundation pit system of internal forces and deformation of the universal law; For example, the Foundation has overloaded the internal force and deformation than those without overloading larger
(2)、Through three different overloaded state supporting system of internal forces and deformation of the comparative study ,getting On the one hand obtains the overload on the other hand not to have under the overload most disadvantageous overload condition to support and protect the system endogenic force and the distortion, it will provide certain reference for the next similar project's design and the construction
(3)、In considering excavation analysis of supporting structure and soil interaction and analyzed the pit excavated for building foundation base to stick out, the surface subsidence problem .Obtained the hole excavated for building foundation base to stick out, the surface subsidence and so on main physical essential factor under the above several kind of different overload condition change rule
In summary, this thesis has analyzed the response of soils and the behavior of support in the process of excavation by steps. The results acquired by means of numerical simulation are basically consistent with the field data, which shows the method concerned in this thesis is reasonable and that the prediction before construction is proper is also proved. So theoretical basis and guidance are provided to actual engineering and these can contribute to improve the structure design level and safety. Valuable design, construction and scientific research experiences are accumulated and provided to the similar engineering.
本文以深圳丰盛町阳光地下街基坑工程为研究背景进行了相关的研究和分析,在总结以往研究成果的基础上,采用Midas GTS软件对深圳丰盛町阳光地下街深基坑工程的排桩支护体系进行了有限元模拟,分析时把土体、支护桩和内支撑系统看成一个空间三维整体,同时考虑了支护结构与土体的相互协调作用,计算了各种开挖工况下的支护体系受力和变形情况。通过与现场实测数据的对比分析得出:
(1)不同超载状态下,基坑支护体系的内力与变形的普遍规律;比如,有超载的基坑的内力与变形较无超载的要大。
(2)通过对三种不同超载状态的支护体系内力与变形的对比研究,得到一边超载一边无超载最不利超载状态下支护体系内力与变形,为今后类似工程的设计与施工提供一定的参考依据;
(3)在基坑开挖分析中考虑支护结构与土体相互作用,分析了基坑底部隆起、地表沉降问题。得到了基坑底部隆起、地表沉降等主要物理要素在上述几种不同超载状态下的变化规律。
文中围绕分步开挖过程中深基坑支护体系与土体应力和变形进行了较深入的研究,通过将数值模拟与现场实测数据进行对比分析,结果表明研究成果和测试数据基本吻合,说明文中研究成果是合理的,起到了施工超前预测、预报的效果,为丰盛町基坑工程提供了理论依据和指导,有助于提高深基坑的设计水平和安全性,并为类似工程的设计、施工和研究丰富和积累了宝贵的经验。
Deeping excavation and support is an old and who have the characteristics of the times of the geotechnical engineering topics. With the high-rise buildings and tall structures continuous to constuct and develop, deeping foundation pit excavation and support of technology and research have become increasingly important. Many overseas specialists have conducted series of research in this field, Including the theoretical calculation, design methods, measured in situ, indoor model test and made a lot of meaningful results. However, because of Deep Foundation Pit complexity and uncertainty, there is much merit in the field continue to study and improve.
This article has conducted the related research and the analysis taking Shenzhen sumptuous Chouyou light underground street hole excavated for building foundation project as the research background, In the summary formerly in research results' foundation, Midas GTS software has carried on the finite element simulation to Shenzhen sumptuous Chouyou light underground street deep pit excavated for building foundation project's piling supports and protections system, when the analysis the soil body, a guard stake and in supports the system to regard as a spatial three dimensional whole, simultaneously had considered the supports and protections structure and the soil body intercoordination function, calculated each kind to excavate under the operating mode the supports and protections system stress and the distortion situation
Through on-site comparison of the measured data analysis:
(1)、Different overloaded state, foundation pit system of internal forces and deformation of the universal law; For example, the Foundation has overloaded the internal force and deformation than those without overloading larger
(2)、Through three different overloaded state supporting system of internal forces and deformation of the comparative study ,getting On the one hand obtains the overload on the other hand not to have under the overload most disadvantageous overload condition to support and protect the system endogenic force and the distortion, it will provide certain reference for the next similar project's design and the construction
(3)、In considering excavation analysis of supporting structure and soil interaction and analyzed the pit excavated for building foundation base to stick out, the surface subsidence problem .Obtained the hole excavated for building foundation base to stick out, the surface subsidence and so on main physical essential factor under the above several kind of different overload condition change rule
In summary, this thesis has analyzed the response of soils and the behavior of support in the process of excavation by steps. The results acquired by means of numerical simulation are basically consistent with the field data, which shows the method concerned in this thesis is reasonable and that the prediction before construction is proper is also proved. So theoretical basis and guidance are provided to actual engineering and these can contribute to improve the structure design level and safety. Valuable design, construction and scientific research experiences are accumulated and provided to the similar engineering.
引文
[1]宋二祥,娄鹏,陆新征,沈伟.某特深基坑支护的非线性三维有限元分析[J].岩土力学,2004,25(4):538-543.
[2]崔江余,梁仁旺.建筑基坑设计计算与施工.北京:中国建材工业出版社,1999, 3
[3]孙良涛,大直径双环梁支护结构体系受力性能分析与三维有限元模拟, [硕士学位论文],天津:天津大学,2005
[4]曲广峰,深基坑工程的三维非线性数值分析,[硕士学位论文],天津:天津大学,2003
[5]龚晓南,深基坑上程设计施上手册,北京:中国建筑上业出版社,2001
[6]刘建航,侯学渊,基坑工程手册,北京:中国建筑工业出版社,1997
[7]宗金辉,深基坑开挖有限元模拟及现场实测研究, [博士论文],天津:天津大学,2006
[8]孙均,汪炳鉴,地下结构有限元解析法,上海:同济大学出版社,第二版,1988
[9]梅传书,陆红等,高层建筑基坑开挖的数值分析研究及工程应用分析,建筑结构学报,2001, 22 (3),81--87
[10]杨林德,软土工程施工技术与环境保护,北京:人民交通出版社,2000
[11]孙钧,城市环境土工学,上海:上海利学技术出版社,2005
[12]孙钧,地下工程设计理论与实践,上海:上海科学技术出版社,1996
[13]高文华,沈蒲生,基坑开挖中地层移动的影响因素分析,岩石力学与工程学,2002,21(8),1153—1157
[14] S. K. Bose, N. N. Som, Parametric study of a braced cut by finite element method, Computer and Geotechnics, 1998, 22 (2)
[15] Brown P T, Finite element analysis of excavation, Computers and Geotechnics, 1985, Vol1(3),207—220
[16]王小文,钱春阳,深基坑支护结构变形及内力有限元分析,铁道学报,1999, 21(6),81—86
[17]娄奕红,俞二溥等,基坑支护结构内力及变形动态分析,岩石力学与工程学报,2003, 22 (3),462—466
[18]徐志兵,不对称荷载作用下的基坑变形研究, [硕士学位论文],南京:东南大学,2005
[19]吕江新,大型深基坑支护结构体系土压力计算及其应用研究, [硕士学位论文],西安:西安建筑科技大学,2006
[20]赵建平,梅国雄,宰金眠.考虑变形与时间效应的土压力计算方法研究[J].盐城工学院学报(自然科学版). Vol. 16 No. 4. Dec. 2003.
[21]刘建航,刘国彬,软土基坑工程钟时空效应理论与实践(上),地下工程与隧道,1999, (3),7—12
[22]刘建航,刘国彬,软土基坑工程钟时空效应理论与实践(下),地下工程与隧道,1999, (4),10--14
[23]高文华,沈蒲生等,深基坑支护结构内力与变形时空效应分析的程序实现,土术工程学报,2003, 36 (2) , 86—90
[24]陈忠汉,程丽萍.深基坑工程.北京:机械工业出版社,1999.
[25]陈卫军等.基于ANSYS深基坑工程增量法计算的二次开发技术研究.中国市政工程,2002(2):31～333
[26]肖宏彬,蔡伟铭.多支撑挡土结构考虑开挖过程的计算分析方法[J].港口工程,1992,5(5):44-48.
[27]肖宏彬,张亦静.多支撑挡土结构考虑开挖过程计算的若干问题[J].建筑结构,2000,30(11):41-43.
[28]熊巨华,李建华.基坑围护工程中土体水平抗力系数m值的分析与确定[J].建筑结构,1998,000(006):39-41,59
[29]俞晓,深基坑开挖与支护的模型试验与ANSYS分析研究, [博士论文],武汉:武汉理工大学,2005
[30]魏汝龙.开挖卸载与被动土压力计算.岩十几工程学报,1997.19: 88—92
[31] Fang Y S. and Shibashi L, Static earth pressure with various wall movements, Journal of Geotechnical Engineering, ASCE, 1986(3), Vo1.112, 317-333.
[32] Fang Y. S. Chen T J. and Wu B. R, Passive earth pressure with various wall movements,Journal of Geotechnical Engineering, ASCE, 1994(8), Vo1.120, 1307-1323.
[33]杨新忠,基与有限单元法的深基坑支护体系变形研究, [硕士学位论文],南京:河海大学,2007
[34]杨雪强,刘祖德等,深基坑支护的杆系有限兀分析,湖北工学院学报,2000,(2),17—20
[35]刘兴旺,施祖元等,基坑支护结构全过程变形及内力分析,建筑结构学报,1998, 19 (5),58—63
[36]宋二祥,娄鹏等,某特深基坑支护的非线性三维有限元分析,岩土力学,2004, 25(4),538—543
[37]陆新征,宋二祥等,某特深基坑考虑支护结构与土体共同作用的三维有限元分析,岩土工程学报,2003,25(4),488—491
[38]高文华,杨林德,软土深基坑围护结构变形的三维有限元分析,工程力学,2000, 17(2),134—141
[39]赵海燕,黄金枝,深基坑支护结构变形的三维有限元分析与模拟,上海交通大学学报,2001, (4),610—613
[40]顾小鲁,陈环,深基坑开挖对临近建筑物的影响,岩土工程师,1993
[41] Lee I K, White W, Ingles O G, etat.岩土工程[M].俞调梅,叶书麟,曹名葆等译.北京:中国建筑工业出版社,1986
[42]赵振英,叶勇,肖明。大型洞群开挖围岩稳定研究[J].人民珠江,1996,(2):14-20.
[43]唐孟雄,陈如桂,陈伟。深基坑工程变形控制[M].北京:中国建材工业出版社,2006,12
[44]吴波.复杂条件下城市地铁隧道施工地表沉降研究[D].西南交通大学博士学位论文,2003
[2]崔江余,梁仁旺.建筑基坑设计计算与施工.北京:中国建材工业出版社,1999, 3
[3]孙良涛,大直径双环梁支护结构体系受力性能分析与三维有限元模拟, [硕士学位论文],天津:天津大学,2005
[4]曲广峰,深基坑工程的三维非线性数值分析,[硕士学位论文],天津:天津大学,2003
[5]龚晓南,深基坑上程设计施上手册,北京:中国建筑上业出版社,2001
[6]刘建航,侯学渊,基坑工程手册,北京:中国建筑工业出版社,1997
[7]宗金辉,深基坑开挖有限元模拟及现场实测研究, [博士论文],天津:天津大学,2006
[8]孙均,汪炳鉴,地下结构有限元解析法,上海:同济大学出版社,第二版,1988
[9]梅传书,陆红等,高层建筑基坑开挖的数值分析研究及工程应用分析,建筑结构学报,2001, 22 (3),81--87
[10]杨林德,软土工程施工技术与环境保护,北京:人民交通出版社,2000
[11]孙钧,城市环境土工学,上海:上海利学技术出版社,2005
[12]孙钧,地下工程设计理论与实践,上海:上海科学技术出版社,1996
[13]高文华,沈蒲生,基坑开挖中地层移动的影响因素分析,岩石力学与工程学,2002,21(8),1153—1157
[14] S. K. Bose, N. N. Som, Parametric study of a braced cut by finite element method, Computer and Geotechnics, 1998, 22 (2)
[15] Brown P T, Finite element analysis of excavation, Computers and Geotechnics, 1985, Vol1(3),207—220
[16]王小文,钱春阳,深基坑支护结构变形及内力有限元分析,铁道学报,1999, 21(6),81—86
[17]娄奕红,俞二溥等,基坑支护结构内力及变形动态分析,岩石力学与工程学报,2003, 22 (3),462—466
[18]徐志兵,不对称荷载作用下的基坑变形研究, [硕士学位论文],南京:东南大学,2005
[19]吕江新,大型深基坑支护结构体系土压力计算及其应用研究, [硕士学位论文],西安:西安建筑科技大学,2006
[20]赵建平,梅国雄,宰金眠.考虑变形与时间效应的土压力计算方法研究[J].盐城工学院学报(自然科学版). Vol. 16 No. 4. Dec. 2003.
[21]刘建航,刘国彬,软土基坑工程钟时空效应理论与实践(上),地下工程与隧道,1999, (3),7—12
[22]刘建航,刘国彬,软土基坑工程钟时空效应理论与实践(下),地下工程与隧道,1999, (4),10--14
[23]高文华,沈蒲生等,深基坑支护结构内力与变形时空效应分析的程序实现,土术工程学报,2003, 36 (2) , 86—90
[24]陈忠汉,程丽萍.深基坑工程.北京:机械工业出版社,1999.
[25]陈卫军等.基于ANSYS深基坑工程增量法计算的二次开发技术研究.中国市政工程,2002(2):31～333
[26]肖宏彬,蔡伟铭.多支撑挡土结构考虑开挖过程的计算分析方法[J].港口工程,1992,5(5):44-48.
[27]肖宏彬,张亦静.多支撑挡土结构考虑开挖过程计算的若干问题[J].建筑结构,2000,30(11):41-43.
[28]熊巨华,李建华.基坑围护工程中土体水平抗力系数m值的分析与确定[J].建筑结构,1998,000(006):39-41,59
[29]俞晓,深基坑开挖与支护的模型试验与ANSYS分析研究, [博士论文],武汉:武汉理工大学,2005
[30]魏汝龙.开挖卸载与被动土压力计算.岩十几工程学报,1997.19: 88—92
[31] Fang Y S. and Shibashi L, Static earth pressure with various wall movements, Journal of Geotechnical Engineering, ASCE, 1986(3), Vo1.112, 317-333.
[32] Fang Y. S. Chen T J. and Wu B. R, Passive earth pressure with various wall movements,Journal of Geotechnical Engineering, ASCE, 1994(8), Vo1.120, 1307-1323.
[33]杨新忠,基与有限单元法的深基坑支护体系变形研究, [硕士学位论文],南京:河海大学,2007
[34]杨雪强,刘祖德等,深基坑支护的杆系有限兀分析,湖北工学院学报,2000,(2),17—20
[35]刘兴旺,施祖元等,基坑支护结构全过程变形及内力分析,建筑结构学报,1998, 19 (5),58—63
[36]宋二祥,娄鹏等,某特深基坑支护的非线性三维有限元分析,岩土力学,2004, 25(4),538—543
[37]陆新征,宋二祥等,某特深基坑考虑支护结构与土体共同作用的三维有限元分析,岩土工程学报,2003,25(4),488—491
[38]高文华,杨林德,软土深基坑围护结构变形的三维有限元分析,工程力学,2000, 17(2),134—141
[39]赵海燕,黄金枝,深基坑支护结构变形的三维有限元分析与模拟,上海交通大学学报,2001, (4),610—613
[40]顾小鲁,陈环,深基坑开挖对临近建筑物的影响,岩土工程师,1993
[41] Lee I K, White W, Ingles O G, etat.岩土工程[M].俞调梅,叶书麟,曹名葆等译.北京:中国建筑工业出版社,1986
[42]赵振英,叶勇,肖明。大型洞群开挖围岩稳定研究[J].人民珠江,1996,(2):14-20.
[43]唐孟雄,陈如桂,陈伟。深基坑工程变形控制[M].北京:中国建材工业出版社,2006,12
[44]吴波.复杂条件下城市地铁隧道施工地表沉降研究[D].西南交通大学博士学位论文,2003
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