兰州地铁车站深基坑开挖过程中降水对邻近地下管道的影响
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摘要
以兰州地铁1号线某车站基坑支护工程为背景,对该车站基坑开挖降水过程中地下管道的位移进行了全面的分析。采用排桩加内撑支护结构对基坑进行支护,考虑了深基坑降水贯穿基坑开挖的全过程,借助有限元软件ADINA建立地铁车站基坑三维有限元分析模型。通过有限元法分析以及实际监测数据,表明车站深基坑开挖及降水对地下管道的位移有显著影响,进而总结了管道的变形规律,为兰州地区地铁车站及类似深基坑设计和施工提供重要的依据。
Taking the deep foundation pit at a subway station of Lanzhou metro line 1 as an example, the displacement of the underground pipes induced by its dewatering is comprehensively analyzed. Using piles and internal bracing structures to support the deep foundation pit and considering dewatering during the whole excavation process, a three-dimensional finite element model is established by using the FEM software ADINA. The FEM analysis and monitoring data show that the deep excavation and dewatering have significant effects on the displacement of underground pipelines. Accordingly the deformation of the pipelines is summarized, so as to provide an important basis for the design and construction of Lanzhou subway stations and similar deep foundation pits.
Taking the deep foundation pit at a subway station of Lanzhou metro line 1 as an example, the displacement of the underground pipes induced by its dewatering is comprehensively analyzed. Using piles and internal bracing structures to support the deep foundation pit and considering dewatering during the whole excavation process, a three-dimensional finite element model is established by using the FEM software ADINA. The FEM analysis and monitoring data show that the deep excavation and dewatering have significant effects on the displacement of underground pipelines. Accordingly the deformation of the pipelines is summarized, so as to provide an important basis for the design and construction of Lanzhou subway stations and similar deep foundation pits.
引文
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[2]陈永才,李镜培,邸国恩,等.某深基坑降水对周边环境影响的分析及处理措施[J].岩土工程学报,2008,30(10):319–322.(CHEN Yong-cai,LI Jing-pei,DI Guo-en,et al.Analysis of a deep foundation pit dewatering impacts on the surrounding environment and treatment measures[J].Chinese Journal of Geotechnical Engineering,2008,30(10):319–322.(in Chinese))
[3]朱庆杰,刘英利,蒋录珍,等.管道摩擦和管径对埋地管道破坏的影响分析[J].地震工程与工程振动学报,2006(3):197–199.(ZHU Qing-jie,LIU Ying-li,JIANG Lu-zhen,et al.Diameter pipe friction and impact of buried pipeline damage analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2006(3):197–199.(in Chinese))
[4]CLOUGH G.H,DUNCAN J M.Finite element analysis of retaining wall behavior[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1971,97(12):1657–1672.
[5]YVES Robert.A new approach to the analysis of high-strain dynamics pile test data[J].Can Geotech J,1994,31:246–253.
[6]JGJ120—2012建筑基坑支护技术规程[S].北京:中国建筑工业出版社,2012.(JGJ120—2012 Technical specification for retaining and protection of building foundation excavations[S].Beijing:China Architecture and Building Press,2012.(in Chinese))
[7]GB 50299—1999地下铁道工程施工及验收规范[S].北京:中国计划出版社,2007.(GB 50299—1999 Subway construction and acceptance of norms[S].Beijing:China Planning Press,2007.(in Chinese))
[8]李一凡,李大勇.受深开挖影响的地下管线安全性判别[J].山东农业大学学报,2004,35(4):593–596.(LI Yi-fan,LI Da-yong.Affected by deep excavation underground pipeline safety discrimination[J].Journal of Shandong Agricultural University,2004,35(4):593–596.(in Chinese))
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