深基坑支护设计影响因素的有限元分析
|
摘要
深基坑工程是当前岩土工程中的热点和难点问题之一,如何有效控制基坑变形,使基坑工程既安全又经济,是人们一直探索的课题。深基坑的支护结构的变形是影响基坑变形的重要因素。针对武汉地区具有代表性的粉质粘土,通过大量的真三轴试验模拟了基坑开挖过程中的应力路径,了解了开挖过程中基坑土体的变形性状,并得到了邓肯–张模型的各参数,建立了深基坑支护结构的非线性弹性模型。同时以平面应变有限元法为基础,通过对武汉某基坑工程进行基坑变形的计算分析,分析了支护结构的刚度、基坑的开挖宽度、土体的变形模量、插入深度、支撑位置和坑内土体加固、基坑开挖的时空效应和基坑周围水环境等设计、施工和自然环境因素对支护结构的变形的影响,了解了基坑开挖过程中基坑支护结构变形、周围地层沉降的发展变化规律,并提出了一些控制基坑变形的方法措施,为深基坑工程的设计和施工提供了依据。
Deep foundation pit engineering is one of pop and difficult problems in rock soil engineering.How to effectively control deformation of foundation pit and make foundation pit engineering safe and economical is the task that people always probe.Deformation for retaining structure of foundation pit is the important factor for effect on the deformation of foundation pit.This paper simulates the stress path in the excavation of foundation pit by large numbers of true triaxial tests in allusion to the silty clay,which is representational in Wuhan area.The deformation properties of soil mass in the excavation of foundation pit have been founded out and the parameters of the Duncan-Zhang soil model have been gained,and nonlinear elastic model of retaining structure of deep foundation pit is established.At the same time,the foundation pit deformation of a piazza in Wuhan is calculated by using the methods of the plane strain finite element.The factors of design,construction and nature environment on effect of the deformation of timbering structures are studied.These factors include the rigidity of timbering structures,the digging width of foundation pit,the deformation modulus of soil mass,the inserted depth,the bracing location and the reinforcing of soils,space-time effect of pit excavation and water environment of foundation pit etc.The deformation of timbering structures in foundation pit excavation and the developing and changing rules of the settlement of surrounding stratum have been founded out.Some measurements,which offer the reference to the design and construction of deep foundation pit,to control the deformation of foundation pit have been put forward.
Deep foundation pit engineering is one of pop and difficult problems in rock soil engineering.How to effectively control deformation of foundation pit and make foundation pit engineering safe and economical is the task that people always probe.Deformation for retaining structure of foundation pit is the important factor for effect on the deformation of foundation pit.This paper simulates the stress path in the excavation of foundation pit by large numbers of true triaxial tests in allusion to the silty clay,which is representational in Wuhan area.The deformation properties of soil mass in the excavation of foundation pit have been founded out and the parameters of the Duncan-Zhang soil model have been gained,and nonlinear elastic model of retaining structure of deep foundation pit is established.At the same time,the foundation pit deformation of a piazza in Wuhan is calculated by using the methods of the plane strain finite element.The factors of design,construction and nature environment on effect of the deformation of timbering structures are studied.These factors include the rigidity of timbering structures,the digging width of foundation pit,the deformation modulus of soil mass,the inserted depth,the bracing location and the reinforcing of soils,space-time effect of pit excavation and water environment of foundation pit etc.The deformation of timbering structures in foundation pit excavation and the developing and changing rules of the settlement of surrounding stratum have been founded out.Some measurements,which offer the reference to the design and construction of deep foundation pit,to control the deformation of foundation pit have been put forward.
引文
[1]秦四清,万林海,汤天鹏,等.深基坑工程优化设计[M].北京:地震出版社,1998.(Qin Siqing,Wan Linhai,Tang Tianpeng,et al.The Optimizing Design of Deep Foundation Pit[M].Beijing:Earthquake Press,1998.(in Chinese))
[2]韩高升.基坑卸荷土体的变形性状试验研究[硕士学位论文][D].武汉:湖北工学院,2002.(Han Gaosheng.Study of tranmutative behavior test for the unloading foundation soil[M.S.Thesis][D].Wuhan:Hubei University of Technology,2002.(in Chinese))
[3]朱志政.平面应变条件下基坑卸荷土体的变形性状研究[硕士学位论文][D].武汉:湖北工学院,2003.(Zhu Zhizheng.Study on tranmutative behavior test for the unloading foundation soil under plane strain[M.S.Thesis][D].Wuhan:Hubei University of Technology,2003.(in Chinese))
[4]俞建霖,龚晓南.深基坑工程的空间性状分析[J].岩土工程学报,1999,21(1):21–25.(Yu Jianlin,Gong Xiaonan.Dimensional behavior analysis of deep foundation pit[J].Chinese Journal of Geotechnical Engineering,1999,21(1):21–25.(in Chinese))
[5]钱家欢,殷宗泽.土工原理与计算(第二版)[M].北京:中国水利水电出版社,1996.(Qian Jiahuan,Yin Zongze.Geotechnical Principle and Calculating(Second Edition)[M].Beijing:China Water Power Press,1996.(in Chinese))
[6]黄生根,张希浩,曹辉.地基处理与基坑支护工程[M].武汉:中国地质大学出版社,1999.(Huang Shenggen,Zhang Xihao,Cao Hui.Ground Treatment and Bracing of Foundation Pit[M].Wuhan:China University of Geosciences Press,1999.(in Chinese))
[7]施建勇,周智勇,赵维炳.支护结构水平位移分析研究[A].见:第六届全国地基处理会议文集[C].[s.l.]:[s.n.],2000.104–110.(Shi Jianyong,Zhou Zhiyong,Zhao Weibing.Analysis and study on horizontal displacement of timbering structure[A].In:the Sixth Countrywide Ground Treatment Congress Corpus[C].[s.l.]:[s.n.],2000.104–110.(in Chinese))
[8]高文华,杨林德,沈蒲生.软土深基坑支护结构内力与变形时空效应的影响因素分析[J].土木工程学报,2001,34(5):90–96.(Gao Wenhua,Yang Linde,Shen Pusheng.Influencing factors′analysis of the space-time effect on the timbering structure internal force and transmutation of soft clay deep foundation pit[J].Journal of Civil Engineering,2001,34(5):90–96.(in Chinese))
[9]高文华,沈蒲生,杨林德.基坑开挖中地层移动的影响因素分析[J].岩石力学与工程学报,2002,21(8):1 153–1 157.(Gao Wenhua,Shen Pusheng,Yang Linde.Influence factors on ground deformation during excavation[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1 153–1 157.(in Chinese))
[10]杨雪强.论深基坑支护的空间效应[J].岩土工程学报,1998,20(2):74–78.(Yang Xueqiang.Discussion on dimensional effect of deep foundation pit′s bracing[J].Chinese Journal of Geotechnical Engineering,1998,20(2):74–78.(in Chinese))
[11]陆瑞明,赵锡宏,马忠政,等.组合式挡墙的基坑围护非线性的空间设计计算理论和方法[J].土木工程学报,2001,34(6):80–87.(Lu Ruiming,Zhao Xihong,Ma Zhongzheng,et al.Nonlinear dimensional design calculating theory and method of foundation pit′s bracing of knockdown retaining wall[J].Journal of Civil Engineering,2001,34(6):80–87.(in Chinese))
[12]曾国熙,潘秋元,胡一峰.软粘土地基基坑开挖性状的研究[J].岩土工程学报,1988,10(3):13–22.(Zeng Guoxi,Pan Qiuyuan,Hu Yifeng.Character study on foundation excavation of soft clay ground[J].Chinese Journal of Geotechnical Engineering,1988,10(3):13–22.(in Chinese))
[13]蒋克锋,赵燕明.单锚预应力支挡结构锚杆设置的相互作用分析[J].地下空间,2001,21(5):470–474.(Jiang Kefeng,Zhao Yanming.Reciprocity analysis of anchor setting of single prestressed bracing structure anchor[J].Underground Space,2001,21(5):470–474.(in Chinese))
[14]娄奕红,俞三溥,王秉勇.基坑支护结构内力及变形动态分析[J].岩石力学与工程学报,2003,22(3):462–466.(Lou Yihong,Yu Sanfu,Wang Bingyong.Analysis of internal force and deformation of support structure for foundation pit[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(3):462–466.(in Chinese))
[15]陆新征,娄鹏,宋二祥,等.润扬长江大桥北锚特深基坑支护方案安全系数及破坏模式分析[J].岩石力学与工程学报,2004,23(11):1 906–1 911.(Lu Xinzheng,Lou Peng,Song Erxiang,et al.analysis on safety coefficient and failure model of support system for deep foundation pit of Runyang Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(11):1 906–1 911.(in Chinese))
[2]韩高升.基坑卸荷土体的变形性状试验研究[硕士学位论文][D].武汉:湖北工学院,2002.(Han Gaosheng.Study of tranmutative behavior test for the unloading foundation soil[M.S.Thesis][D].Wuhan:Hubei University of Technology,2002.(in Chinese))
[3]朱志政.平面应变条件下基坑卸荷土体的变形性状研究[硕士学位论文][D].武汉:湖北工学院,2003.(Zhu Zhizheng.Study on tranmutative behavior test for the unloading foundation soil under plane strain[M.S.Thesis][D].Wuhan:Hubei University of Technology,2003.(in Chinese))
[4]俞建霖,龚晓南.深基坑工程的空间性状分析[J].岩土工程学报,1999,21(1):21–25.(Yu Jianlin,Gong Xiaonan.Dimensional behavior analysis of deep foundation pit[J].Chinese Journal of Geotechnical Engineering,1999,21(1):21–25.(in Chinese))
[5]钱家欢,殷宗泽.土工原理与计算(第二版)[M].北京:中国水利水电出版社,1996.(Qian Jiahuan,Yin Zongze.Geotechnical Principle and Calculating(Second Edition)[M].Beijing:China Water Power Press,1996.(in Chinese))
[6]黄生根,张希浩,曹辉.地基处理与基坑支护工程[M].武汉:中国地质大学出版社,1999.(Huang Shenggen,Zhang Xihao,Cao Hui.Ground Treatment and Bracing of Foundation Pit[M].Wuhan:China University of Geosciences Press,1999.(in Chinese))
[7]施建勇,周智勇,赵维炳.支护结构水平位移分析研究[A].见:第六届全国地基处理会议文集[C].[s.l.]:[s.n.],2000.104–110.(Shi Jianyong,Zhou Zhiyong,Zhao Weibing.Analysis and study on horizontal displacement of timbering structure[A].In:the Sixth Countrywide Ground Treatment Congress Corpus[C].[s.l.]:[s.n.],2000.104–110.(in Chinese))
[8]高文华,杨林德,沈蒲生.软土深基坑支护结构内力与变形时空效应的影响因素分析[J].土木工程学报,2001,34(5):90–96.(Gao Wenhua,Yang Linde,Shen Pusheng.Influencing factors′analysis of the space-time effect on the timbering structure internal force and transmutation of soft clay deep foundation pit[J].Journal of Civil Engineering,2001,34(5):90–96.(in Chinese))
[9]高文华,沈蒲生,杨林德.基坑开挖中地层移动的影响因素分析[J].岩石力学与工程学报,2002,21(8):1 153–1 157.(Gao Wenhua,Shen Pusheng,Yang Linde.Influence factors on ground deformation during excavation[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(8):1 153–1 157.(in Chinese))
[10]杨雪强.论深基坑支护的空间效应[J].岩土工程学报,1998,20(2):74–78.(Yang Xueqiang.Discussion on dimensional effect of deep foundation pit′s bracing[J].Chinese Journal of Geotechnical Engineering,1998,20(2):74–78.(in Chinese))
[11]陆瑞明,赵锡宏,马忠政,等.组合式挡墙的基坑围护非线性的空间设计计算理论和方法[J].土木工程学报,2001,34(6):80–87.(Lu Ruiming,Zhao Xihong,Ma Zhongzheng,et al.Nonlinear dimensional design calculating theory and method of foundation pit′s bracing of knockdown retaining wall[J].Journal of Civil Engineering,2001,34(6):80–87.(in Chinese))
[12]曾国熙,潘秋元,胡一峰.软粘土地基基坑开挖性状的研究[J].岩土工程学报,1988,10(3):13–22.(Zeng Guoxi,Pan Qiuyuan,Hu Yifeng.Character study on foundation excavation of soft clay ground[J].Chinese Journal of Geotechnical Engineering,1988,10(3):13–22.(in Chinese))
[13]蒋克锋,赵燕明.单锚预应力支挡结构锚杆设置的相互作用分析[J].地下空间,2001,21(5):470–474.(Jiang Kefeng,Zhao Yanming.Reciprocity analysis of anchor setting of single prestressed bracing structure anchor[J].Underground Space,2001,21(5):470–474.(in Chinese))
[14]娄奕红,俞三溥,王秉勇.基坑支护结构内力及变形动态分析[J].岩石力学与工程学报,2003,22(3):462–466.(Lou Yihong,Yu Sanfu,Wang Bingyong.Analysis of internal force and deformation of support structure for foundation pit[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(3):462–466.(in Chinese))
[15]陆新征,娄鹏,宋二祥,等.润扬长江大桥北锚特深基坑支护方案安全系数及破坏模式分析[J].岩石力学与工程学报,2004,23(11):1 906–1 911.(Lu Xinzheng,Lou Peng,Song Erxiang,et al.analysis on safety coefficient and failure model of support system for deep foundation pit of Runyang Bridge[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(11):1 906–1 911.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心