天津滨海新区基坑开挖的数值模拟与变形研究
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摘要
近年来,为了保证基坑开挖能够安全进行,许多学者和技术人员对基坑工程展开了大量的研究。一方面,基坑开挖深度的增加和开挖面积的增加对安全施工提出了更高的要求,基坑工程需要满足围护结构本身的安全性和稳定性。另一方面,城市建设工程的集中性导致基坑工程所面临的环境日趋复杂,基坑工程还需要满足周边环境的安全性。由于城市轨道交通建设的需要,交叉型基坑的施工也逐渐增加,交叉基坑施工复杂,施工时不仅要考虑支护结构的强度要求,还要考虑交叉基坑的变形要求。因此,对交叉型深基坑的变形特性进行分析也显得十分必要。
本文以PLAXIS为主要计算工具,对于家堡站交通枢纽工程中大型基坑开挖进行了二维数值模拟和三维数值模拟。并且结合施工现场监测数据,进行了基坑变形特性的研究,主要包括地下连续墙水平位移,坑内土体隆起,坑外土体的沉降等。通过对比分析验证了三维数值模拟的合理性和基坑开挖的空间效应。本文对B1线隧道与海河隧道交叉基坑开挖施工工况进行了数值模拟,并且结合现场监测数据,对交叉型基坑开挖的变形特性作了一定的分析。最后,本文针对交叉型基坑开挖时墙体交叉处容易发生破坏的问题,对坑角处采取了一定的加固措施,并且取得了良好的效果。
In recent years, in order to guarantee the excavation’s security, many scholars and technical personnel have launched a lot of research in excavation engineering. On one hand, the increase of the depth of excavation and the increase of excavation area are demanding more for security in construction. Excavation engineering needs to meet palisade structure’s security and stability. On the other hand, the centralization of the urban construction engineering makes the environment of excavation engineering more complicated, and excavation engineering also needs to meet the security of the surrounding environment. Due to the needs of the construction of urban rail transit, the construction of crossed excavation engineering is gradually increasing. Considering its complexity, we should pay attention to the requirement of the strength of the supporting structures, but also the requirement of the deformation. Therefore, it is necessary to analysis the deformation characteristics of the deep crossed excavation engineering.
This paper, using PLAXIS as the main computing tool, evaluates two dimensional finite element analysis and three dimensional finite element analysis of the excavation engineering in Yujiapu traffic hub project. And basing on the monitoring data in construction site, this paper researches the deformation characteristics of excavation engineering, including horizontal displacement of the underground diaphragm wall, and vertical displacement of soil in the bottom of the foundation pit, soil settlement near the foundation pit, and so on. Through the comparison and analysis of the results, it confirms the rationality of three dimensional finite element analysis and the spatial effect of foundation pit excavation. This paper evaluates finite element analysis of the Haihe river tunnel and B1 line tunnel cross-shaped excavation engineering, and analyzes the deformation characteristics of the cross-shaped foundation pit excavation, combining with the monitoring data. Finally, this paper takes some reinforcement measures to solve the problem of the junction of cross-shaped excavation engineering wall, and achieves good effect.
本文以PLAXIS为主要计算工具,对于家堡站交通枢纽工程中大型基坑开挖进行了二维数值模拟和三维数值模拟。并且结合施工现场监测数据,进行了基坑变形特性的研究,主要包括地下连续墙水平位移,坑内土体隆起,坑外土体的沉降等。通过对比分析验证了三维数值模拟的合理性和基坑开挖的空间效应。本文对B1线隧道与海河隧道交叉基坑开挖施工工况进行了数值模拟,并且结合现场监测数据,对交叉型基坑开挖的变形特性作了一定的分析。最后,本文针对交叉型基坑开挖时墙体交叉处容易发生破坏的问题,对坑角处采取了一定的加固措施,并且取得了良好的效果。
In recent years, in order to guarantee the excavation’s security, many scholars and technical personnel have launched a lot of research in excavation engineering. On one hand, the increase of the depth of excavation and the increase of excavation area are demanding more for security in construction. Excavation engineering needs to meet palisade structure’s security and stability. On the other hand, the centralization of the urban construction engineering makes the environment of excavation engineering more complicated, and excavation engineering also needs to meet the security of the surrounding environment. Due to the needs of the construction of urban rail transit, the construction of crossed excavation engineering is gradually increasing. Considering its complexity, we should pay attention to the requirement of the strength of the supporting structures, but also the requirement of the deformation. Therefore, it is necessary to analysis the deformation characteristics of the deep crossed excavation engineering.
This paper, using PLAXIS as the main computing tool, evaluates two dimensional finite element analysis and three dimensional finite element analysis of the excavation engineering in Yujiapu traffic hub project. And basing on the monitoring data in construction site, this paper researches the deformation characteristics of excavation engineering, including horizontal displacement of the underground diaphragm wall, and vertical displacement of soil in the bottom of the foundation pit, soil settlement near the foundation pit, and so on. Through the comparison and analysis of the results, it confirms the rationality of three dimensional finite element analysis and the spatial effect of foundation pit excavation. This paper evaluates finite element analysis of the Haihe river tunnel and B1 line tunnel cross-shaped excavation engineering, and analyzes the deformation characteristics of the cross-shaped foundation pit excavation, combining with the monitoring data. Finally, this paper takes some reinforcement measures to solve the problem of the junction of cross-shaped excavation engineering wall, and achieves good effect.
引文
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[2]李昀,马稚青,田振,顾倩燕.相邻深大基坑同步施工的相互影响研究[J].水运工程,2009,8:96–100.
[3]李忠.黄土地区深基坑支护结构分析及其设计软件开发:[硕士学位论文],兰州;兰州理工大学,2005.
[4]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[J] .工程力学学报,2000,17(2):134-140.
[5]候永茂,王建华,陈锦剑等.超大型深基坑开挖过程三维有限元分析[J].岩土工程学报(增刊),2006,28:1375-1377.
[6]赵海燕,黄金枝.软土深基坑围护结构变形的三维有限元分析[J].上海交通大学学报,2001,35(4):610–613.
[7]阎军,张志勇.深基坑的空间角效应[J].土工基础, 2000,14(3):55–60.
[8]王旭东,王素霞.基坑开挖对临近建筑物影响的数值分析研究:[硕士学位论文],南京;南京工业大学,2006.
[9]俞建霖,龚晓南.基坑工程变形性状研究[J].土木工程学报,2002,35(4):86-90.
[10]夏明耀.地下连续墙的变形机理与环境问题对策[J] .同济大学学报,1991, 19(1):59-66.
[11]陈有亮,李林.上海地区深基坑开挖的三维弹塑性有限元分析与智能预测:[硕士学位论文],上海;上海大学,2007.
[12]俞建霖,龚晓南.软土地基基坑开挖的三维性状分析[J].浙江大学学报,1998,32(5):552-557.
[13]周春松,闫澍旺,朱平.地下连续墙技术在天津港应用的研究:[硕士学位论文],天津;天津大学,2004.
[14]冀侠荣,魏青,路霞.相邻深基坑同期施工的相互影响问题研究[J].河南科学学报,2010,28(4):456-459.
[15]薛澳,丁立,董月英.不同间距情况下相邻基坑施工的相互影响[J] .现代城市轨道交通,2005,4:28-30.
[16]张睿华.深大基坑内相邻基坑施工时的相互影响分析[J].建筑施工, 2008,30(10):869–971.
[17]顾晓鲁,张斗斗.天津基坑工程的研究:[硕士学位论文],天津;天津大学,2002.
[18]刘兴旺,施祖元,益德清,吴世明.软土地区基坑开挖变形性状研究[J].岩土工程学报,1999,21(4):456–460.
[19]龚晓南,高有潮.深基坑工程施工设计手册[M].北京:中国建筑工业出版社,1998.
[20]张孟喜,王玉玲.深基坑开挖对地下管线影响的有限元分析及神经网络预测:[硕士学位论文],上海;上海大学,2005.
[21] Clough G W, Duncan J M. Finite element analyses of retaining wall behavior [J]. Journal of the soil Mechanics and Foundations Division, ASCE, 1971, 97(12): 1657-1673.
[22] Ou C Y, Chiou D C, Wu T S. Three-dimensional finite elementanalysis of deep excavations [J]. Journal of Geotechnical Engineering, ASCE, 1996, 122 (5):337-345.
[23] Pio-Go Hsieh,Chang-Yu Ou.Shape of ground surface settlement profiles caused by excavation[J].Canadian Geotechnical Journal,1998,35:1004-1017.
[24] Ou Chang-Yu, Liao Jui-tang, Lin Horn-da. Performance of diaphragm wall construction using top-down method[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124(9): 798-808.
[25]李琳,杨敏,熊巨华.软土地区深基坑变形特性分析[J].土木工程学报,2007,40(4):66-72.
[26]程琪,刘国彬,张伟立.上海地区地铁超深基坑及深基坑变形有限元分析[J].地下空间与工程学报(增刊2),2009,5(supp.2):1497–1502.
[27]阎军,张志勇.相邻深基坑同期施工的相互影响问题研究[J].河南科学, 2010,28(4):456–459.
[28]陆东泉,杨劲松.软土地基相邻深基坑支护结构同期施工的安全性研究[J].建筑施工,1999,21(1):12.14.
[29]刘国彬,王卫东.基坑工程手册(第二版),北京:中国建筑工业出版社,2009.
[30] Goldberg D.T.,Jaworski W.E.,Gordon M.D..Lateral Support Systems and Underpinning [A].Report No.FHWA-RD-75-129[C],Volume 2,FederalHighway Administration,Washington,1976.
[31] Adbulaziz I.Mana,G.Wayne Clough.Prediction of movement for braced cuts in clay[J].Journal of Geotechnical Division,1981,107(GT6):759-777.
[32]谭跃虎,吉同筠.软土深挖基坑中挡墙侧向变形分析与计算[J].岩土工程学报,1995,17(4):71–76.
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