黄河冲积地层深基坑支护优化及应用研究
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摘要
黄河冲积地层的土体软弱、稳定性差、基坑支护困难,施工风险高,极易诱发恶性工程事故。本文以济南省会文化艺术中心大厦深基坑为工程背景,采用现场监测数据分析、统计建模和FLAC3D数值模拟相结合的方法进行模型优化和辩识参数。以支护桩体水平位移为基坑变形稳定性评价指标,讨论了支护桩插入比、支护桩刚度、锚索预应力等因素对该指标的影响,进而提出了适合于济南市冲积层深基坑支护的合理参数。确保了济南省会文化艺术中心大厦深基坑施工的安全、优质;为同类地层深基坑支护提供了支护设计经验和参考。
Because of soft soil,poor stability and the difficulty of foundation pit supporting in the Yellow River alluvial formation,the construction work has high risk and easily induces malignant engineering accidents. Taking the deep foundation pit of the provincial capital culture and art center as engineering background,a model was established on the basis of the site monitoring data analysis and statistics,with combining FLAC3 Dnumerical simulation for model optimization and identification parameters. The effect of insertion ratio of retaining pile,the rigidity of the retaining structure and the anchor cable prestress on the deformation is discussed according to the evaluation index based on pile horizontal displacement. Then reasonable parameters for deep foundation pit supporting in Jinan city alluvium are put forward. It ensures that the deep foundation pit construction in the Provincial Capital Culture and Art Center is safe and of high quality,and provides supporting design experience and reference for the similar formation deep foundation pit supporting.
Because of soft soil,poor stability and the difficulty of foundation pit supporting in the Yellow River alluvial formation,the construction work has high risk and easily induces malignant engineering accidents. Taking the deep foundation pit of the provincial capital culture and art center as engineering background,a model was established on the basis of the site monitoring data analysis and statistics,with combining FLAC3 Dnumerical simulation for model optimization and identification parameters. The effect of insertion ratio of retaining pile,the rigidity of the retaining structure and the anchor cable prestress on the deformation is discussed according to the evaluation index based on pile horizontal displacement. Then reasonable parameters for deep foundation pit supporting in Jinan city alluvium are put forward. It ensures that the deep foundation pit construction in the Provincial Capital Culture and Art Center is safe and of high quality,and provides supporting design experience and reference for the similar formation deep foundation pit supporting.
引文
[1]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.(Liu Jianhang,Hou Xueyuan.The foundation pit engineering manual[M].Beijing:China Architecture and Building Press,1997.(in Chinese))
[2]王显星,包旭范,高强.上海铁路南站大型基坑工程施工对周边环境影响[J].岩石力学与工程学报,2005,24(增2):5454-5458.(Wang Xianxing,Bao Xufan,Gao Qiang.Influence of large foundation pit construction caused by Shanghai south railway station on environment in Shanghai[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5454-5458.(in Chinese))
[3]李磊,段宝福.地铁车站深基坑工程的监控量测与数值模拟[J].岩石力学与工程学报,2013,32(增1):2684-2691.(Li Lei,Duan Baofu.Monitoring measurement and numerical simulation for deep foundation pit subway station[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Supp.1):2684-2691.(in Chinese))
[4]李淑,张顶立,房倩,等.北京地区深基坑墙体变形特性研究[J].岩石力学与工程学报,2012,31(11):2344-2353.(Li Shu,Zhang Dingli,Fang Qian,et al.Research on characteristics of retaining wall deformation due to deep excavation in Beijing[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(11):2344-2353.(in Chinese))
[5]高盟,高广运,冯世进,等.基坑开挖引起紧贴运营地铁车站的变形控制研究[J].岩土工程学报,2008,30(6):818-823.(Gao Meng,Gao Guangyun,Feng Shijin,et al.Control of deformation of operating subway station induced by adjacent deep excavation[J].Chinese Journal of Geotechnical Engineering,2008,30(6):818-823.(in Chinese))
[6]Borja R I.Analysis of incremental excavation based on critical state theory[J].Journal of Geotechnical Engineering Division,ASCE,1990,116(6):964-985.
[7]顾亮.盘锦地区某基坑工程变形特性三维数值分析[J].地下空间与工程学报,2013,9(5):1092-1096.(Gu Liang.3D numerical deformation analysis of a excavation constructed in Panjin area[J].Chinese Journal of Underground Space and Engineering,2013,9(5):1092-1096.(in Chinese))
[8]王明龙,王景梅.深基坑桩锚支护中桩内力变化规律数值模拟研究[J].地下空间与工程学报,2013,9(3):576-584.(Wang Minglong,Wang Jingmei.Numerical simulation on the variation law of pile internal force of pile-anchor retaining structure in deep foundation pit[J].Chinese Journal of Underground Space and Engineering,2013,9(3):576-584.(in Chinese))
[9]李佳宇,张子新.圆砾层地铁车站深基坑变形特性三维数值分析[J].地下空间与工程学报,2012,8(1):71-76.(Li Jiayu,Zhang Zixin.3D numerical analysis of deep station exaction constructed in round gravel strata[J].Chinese Journal of Underground Space and Engineering,2012,8(1):71-76.(in Chinese))
[10]李长冬.抗滑桩与滑坡体相互作用机理及其优化研究[D].武汉:中国地质大学,2009.(Li Changdong.Study on interaction mechanism between anti-slide pile and landslide mass and pile optimization[D].Wuhan:China University of Geosciences,2009.(in Chinese))
[11]贾海莉,王成华,李江洪.基于土拱效应的抗滑桩与护壁桩的桩间距分析[J].工程地质学报,2004,12(1):98-103.(Jia Haili,Wang Chenghua,Li Jianghong.Analysis of pile spacing between anti-sloding piles and petaining piles in accordance with soil arching effect[J].Journal of Engineering Geology,2004,12(1):98-103.(in Chinese))
[12]郑学鑫.抗滑桩桩间土拱效应及其有限元模拟研究[D].南京:河海大学,2007.(Zheng Xuexin.Analysis and simulation of soil arching effects on anti-slide pil es[D].Nanjing:Hehai University,2007.(in Chinese))
[13]杨有海,武进广.杭州地铁秋涛路车站深基坑支护结构性状分析[J].岩石力学与工程学报,2008,27(增2):3386-3392.(Yang Youhai,Wu Jinguang.Analysis of retaining structures for deep foundation pit of Qiutao road station in Hangzhou metro[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Supp.2):3386-3392.(in Chinese))
[14]吴旭君,郑平,赵伟,等.滨海地区软土地层超深基坑支护设计实例[J].岩土工程学报,2010,32(增1):388-391.(Wu Xujun,Zheng Ping,Zhao Wei,et al.Support of ultra-deep foundation pits in soft soils in coastal areas[J].Chinese Journal of Geotechnical Engineering,2010,32(Supp.1):388-391.(in Chinese))
[15]李振.复杂场地桩锚支护基坑变形性状及影响因素研究[D].重庆:重庆大学,2012.(Li Zhen.Study on deformation behavior and its impact factors of deep foundation pit supported by pile anchorage in construction cite of complicated geological conditions[D].Chongqing:Chongqing University,2012.(in Chinese))
[2]王显星,包旭范,高强.上海铁路南站大型基坑工程施工对周边环境影响[J].岩石力学与工程学报,2005,24(增2):5454-5458.(Wang Xianxing,Bao Xufan,Gao Qiang.Influence of large foundation pit construction caused by Shanghai south railway station on environment in Shanghai[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5454-5458.(in Chinese))
[3]李磊,段宝福.地铁车站深基坑工程的监控量测与数值模拟[J].岩石力学与工程学报,2013,32(增1):2684-2691.(Li Lei,Duan Baofu.Monitoring measurement and numerical simulation for deep foundation pit subway station[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Supp.1):2684-2691.(in Chinese))
[4]李淑,张顶立,房倩,等.北京地区深基坑墙体变形特性研究[J].岩石力学与工程学报,2012,31(11):2344-2353.(Li Shu,Zhang Dingli,Fang Qian,et al.Research on characteristics of retaining wall deformation due to deep excavation in Beijing[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(11):2344-2353.(in Chinese))
[5]高盟,高广运,冯世进,等.基坑开挖引起紧贴运营地铁车站的变形控制研究[J].岩土工程学报,2008,30(6):818-823.(Gao Meng,Gao Guangyun,Feng Shijin,et al.Control of deformation of operating subway station induced by adjacent deep excavation[J].Chinese Journal of Geotechnical Engineering,2008,30(6):818-823.(in Chinese))
[6]Borja R I.Analysis of incremental excavation based on critical state theory[J].Journal of Geotechnical Engineering Division,ASCE,1990,116(6):964-985.
[7]顾亮.盘锦地区某基坑工程变形特性三维数值分析[J].地下空间与工程学报,2013,9(5):1092-1096.(Gu Liang.3D numerical deformation analysis of a excavation constructed in Panjin area[J].Chinese Journal of Underground Space and Engineering,2013,9(5):1092-1096.(in Chinese))
[8]王明龙,王景梅.深基坑桩锚支护中桩内力变化规律数值模拟研究[J].地下空间与工程学报,2013,9(3):576-584.(Wang Minglong,Wang Jingmei.Numerical simulation on the variation law of pile internal force of pile-anchor retaining structure in deep foundation pit[J].Chinese Journal of Underground Space and Engineering,2013,9(3):576-584.(in Chinese))
[9]李佳宇,张子新.圆砾层地铁车站深基坑变形特性三维数值分析[J].地下空间与工程学报,2012,8(1):71-76.(Li Jiayu,Zhang Zixin.3D numerical analysis of deep station exaction constructed in round gravel strata[J].Chinese Journal of Underground Space and Engineering,2012,8(1):71-76.(in Chinese))
[10]李长冬.抗滑桩与滑坡体相互作用机理及其优化研究[D].武汉:中国地质大学,2009.(Li Changdong.Study on interaction mechanism between anti-slide pile and landslide mass and pile optimization[D].Wuhan:China University of Geosciences,2009.(in Chinese))
[11]贾海莉,王成华,李江洪.基于土拱效应的抗滑桩与护壁桩的桩间距分析[J].工程地质学报,2004,12(1):98-103.(Jia Haili,Wang Chenghua,Li Jianghong.Analysis of pile spacing between anti-sloding piles and petaining piles in accordance with soil arching effect[J].Journal of Engineering Geology,2004,12(1):98-103.(in Chinese))
[12]郑学鑫.抗滑桩桩间土拱效应及其有限元模拟研究[D].南京:河海大学,2007.(Zheng Xuexin.Analysis and simulation of soil arching effects on anti-slide pil es[D].Nanjing:Hehai University,2007.(in Chinese))
[13]杨有海,武进广.杭州地铁秋涛路车站深基坑支护结构性状分析[J].岩石力学与工程学报,2008,27(增2):3386-3392.(Yang Youhai,Wu Jinguang.Analysis of retaining structures for deep foundation pit of Qiutao road station in Hangzhou metro[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Supp.2):3386-3392.(in Chinese))
[14]吴旭君,郑平,赵伟,等.滨海地区软土地层超深基坑支护设计实例[J].岩土工程学报,2010,32(增1):388-391.(Wu Xujun,Zheng Ping,Zhao Wei,et al.Support of ultra-deep foundation pits in soft soils in coastal areas[J].Chinese Journal of Geotechnical Engineering,2010,32(Supp.1):388-391.(in Chinese))
[15]李振.复杂场地桩锚支护基坑变形性状及影响因素研究[D].重庆:重庆大学,2012.(Li Zhen.Study on deformation behavior and its impact factors of deep foundation pit supported by pile anchorage in construction cite of complicated geological conditions[D].Chongqing:Chongqing University,2012.(in Chinese))