钢支撑滞后架设对深基坑围护结构及地表沉降的影响
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摘要
为探究钢支撑滞后架设对基坑围护结构及地表沉降的影响,以某地铁车站深基坑为研究对象,基于实测数据及数值模拟结果,分析了钢支撑滞后架设对深基坑围护结构弯矩、水平变形及地表沉降的影响规律。结果表明:基坑开挖过程中,支撑滞后架设会导致围护结构水平变形及地表沉降急剧增大,对周边环境带来不利影响;第2、3道支撑均出现滞后架设对围护结构水平变形、弯矩及地表沉降最大值的影响大于第2、3道支撑分别出现滞后架设对围护结构水平变形、弯矩及地表沉降最大值的影响之和;相比第2道支撑滞后架设而言,第3道支撑滞后架设更易诱发围护结构开裂。相关研究成果可为类似工程设计及施工提供参考。
In order to obtain the influence on retaining wall and ground settlement of deep excavation when the steel bracing occurs delayed installation,a deep foundation pit of subway station is taking as the research object.And the influence of delaying installation of steel bracing on bending moment,horizontal deformation of retaining wall and ground surface settlement is analyzed based on measured data and the numerical simulation results. The results show that lag of erection for steel bracing can lead horizontal deformation of retaining wall and ground surface settlement to a sharp increase. It has negative effects on around circumstances. The influence of the second and third bracing all occurs lag of erection on the maximum horizontal deformation,bending moment of retaining structure and maximum surface settlement is greater than that the second or third bracing appears lag of erection respectively. Compared with lag of erection of the second bracing,the third bracing occurs delayed installation is more likely to induce fissures of the retaining structure. The related research results can provide necessary reference for the design and construction of similar projects.
In order to obtain the influence on retaining wall and ground settlement of deep excavation when the steel bracing occurs delayed installation,a deep foundation pit of subway station is taking as the research object.And the influence of delaying installation of steel bracing on bending moment,horizontal deformation of retaining wall and ground surface settlement is analyzed based on measured data and the numerical simulation results. The results show that lag of erection for steel bracing can lead horizontal deformation of retaining wall and ground surface settlement to a sharp increase. It has negative effects on around circumstances. The influence of the second and third bracing all occurs lag of erection on the maximum horizontal deformation,bending moment of retaining structure and maximum surface settlement is greater than that the second or third bracing appears lag of erection respectively. Compared with lag of erection of the second bracing,the third bracing occurs delayed installation is more likely to induce fissures of the retaining structure. The related research results can provide necessary reference for the design and construction of similar projects.
引文
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7 中华人民共和国住房和城乡建设部.城市轨道交通工程监测技术规范:GB 50911—2013[S].北京:中国建筑工业出版社,2014Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Code for monitoring measurement of urban rail transit engineering:GB 50911—2013[S]. Beijing:China Architecture&Building Press,2014
8 Brinkgreve R B J,Broere W. Plaxis material models manual[M].Netherlands:Delft,2006
9 周恩平.考虑小应变的硬化土本构模型在基坑变形分析中的应用[D].哈尔滨:哈尔滨工业大学,2010Zhou Enping. Application of hardening soil model with small-strain in deformation analysis for foundation pit[D]. Harbin:Harbin Institute of Technology,2010
10 徐芳超.相邻深基坑同期开挖相互影响变形性状研究[D].厦门:华侨大学,2015Xu Fangchao. The interactional deformation behavior of synchronized excavation of adjacent deep foundation pits[D]. Xiamen:Huaqiao University,2015
2 郑东升.软土地层深长基坑变形原因分析与控制技术[J].山西建筑,2015,16:41-42Zheng Dongsheng. On analysis of reasons for deformation at deep and long foundation pits in soft soil stradum[J]. Shanxi Architecture,2015,16:41-42
3 时振兴,陈龙文.深基坑开挖至花岗岩残积土基底时围护结构变形过大的原因分析及应对措施[J].广州建筑,2016,44(4):23-26Shi Zhenxing,Chen Longwen. The reasons analysis and corresponding measures for the oversize deformation of the fencing structures in the deep excavation dug to the granite residual soil[J]. Guangzhou Architecture,2016,44(4):23-26
4 胡力绳.杭州地铁1号线深基坑地下连续墙变形有限元分析[J].路基工程,2011,3:90-93Hu Lisheng. Finite element analysis on the deformation of concrete diaphragm wall in deep foundation pit of No. 1 line of Hangzhou metro[J]. Subgrade Engineering,2011,3:90-93
5 周勇,郭楠,杨校辉,等.某桩锚支护深基坑超挖变形分析与加固处理[J].地下空间与工程学报,2015,11(增刊1):211-216Zhou Yong,Guo Nan,Yang Xiaohui,et al. Deformation analyses and reinforcement treatment of an overbreak deep foundation pit supported with pile-anchor retaining structure[J]. Chinese Journal of Underground Space and Engineering,2015,11(S1):211-216
6 汤瑞,王强,过令,等.不同超挖厚度对围护结构及周边环境的影响[J].长江科学院院报,2016,33(4):105-110Tang Rui,Wang Qiang,Guo Ling,et al. Influence of over-excavation thickness on retaining structure and surrounding environment[J].Journal of Yangtze River Scientific Research Institute,2016,33(4):105-110
7 中华人民共和国住房和城乡建设部.城市轨道交通工程监测技术规范:GB 50911—2013[S].北京:中国建筑工业出版社,2014Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Code for monitoring measurement of urban rail transit engineering:GB 50911—2013[S]. Beijing:China Architecture&Building Press,2014
8 Brinkgreve R B J,Broere W. Plaxis material models manual[M].Netherlands:Delft,2006
9 周恩平.考虑小应变的硬化土本构模型在基坑变形分析中的应用[D].哈尔滨:哈尔滨工业大学,2010Zhou Enping. Application of hardening soil model with small-strain in deformation analysis for foundation pit[D]. Harbin:Harbin Institute of Technology,2010
10 徐芳超.相邻深基坑同期开挖相互影响变形性状研究[D].厦门:华侨大学,2015Xu Fangchao. The interactional deformation behavior of synchronized excavation of adjacent deep foundation pits[D]. Xiamen:Huaqiao University,2015