复杂环境下多种支护结构并存的深基坑监测分析
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摘要
南宁市九州国际深基坑采用桩撑以及桩撑锚联合支护等多种支护体系,其周边环境非常复杂,文中针对基坑支护桩深层水平位移、地表沉降、环梁支撑轴力、建筑物沉降等监测数据进行分析,得出了以下结论:深基坑变形情况与基坑周边环境有关,临近道路和建筑一侧变形较大;桩顶锚索能有效控制基坑顶部水平位移,环梁内支撑能有效控制基坑深层水平位移;支护桩深层水平位移图线大致为弓形,最大侧移小于软土地区的统计结果,车辆荷载会加剧蠕变效应,增大侧移;最大地表沉降与支护桩顶侧移密切相关;周边建筑在发生沉降的同时向坑内倾斜;立柱的隆起受开挖面积和开挖时间影响较大;环梁支撑轴力值表现为环撑>角撑>辐射撑,支撑体系均能满足围护结构变形控制指标要求。研究结果可为同类深基坑设计提供参考。
Pile-anchor-braced composite supporting structure is adopted for the deep foundation pit of Jiuzhou International Center in Nanning city. Surrounding environment of the foundation pit iscomplicated. By analyzing the monitoring data of the deep foundation pit,including horizontal displacement of soldier pile,ground settlement,axial force of ring beam support and building settlement,some conclusions are obtained. The deformation of deep foundation pit is related with surrounding environment. On the sides near roads and surrounding buildings,the deformation is large. The top displacement of foundation pit can be effectively controlled by anchor cable. The horizontal displacement of deep foundation pit can be effectively controlled by ring beam support.The distribution of deep horizontal displacement of support pile features a "bow " shape. The maximum deflection of the foundation pit is less than the result recorded in soft soil area. Creep effect can be enlarged by vehicle loads,and so can the lateral displacement of the pit. The maximum ground surface settlement and the lateral displacement for the top of the support pile are closely related. Surrounding buildings settle and tilted toward to the foundation pit. The uplift of column is significant affected by excavation area and time. Axial force of circular strut is larger than that of angle brace and radial support,and axial force of radial support is the smallest. The implementation and monitoring results show that entire support system achieves the goal of deformation retaining. It may provide a useful reference for the design and construction of similar foundation pit.
Pile-anchor-braced composite supporting structure is adopted for the deep foundation pit of Jiuzhou International Center in Nanning city. Surrounding environment of the foundation pit iscomplicated. By analyzing the monitoring data of the deep foundation pit,including horizontal displacement of soldier pile,ground settlement,axial force of ring beam support and building settlement,some conclusions are obtained. The deformation of deep foundation pit is related with surrounding environment. On the sides near roads and surrounding buildings,the deformation is large. The top displacement of foundation pit can be effectively controlled by anchor cable. The horizontal displacement of deep foundation pit can be effectively controlled by ring beam support.The distribution of deep horizontal displacement of support pile features a "bow " shape. The maximum deflection of the foundation pit is less than the result recorded in soft soil area. Creep effect can be enlarged by vehicle loads,and so can the lateral displacement of the pit. The maximum ground surface settlement and the lateral displacement for the top of the support pile are closely related. Surrounding buildings settle and tilted toward to the foundation pit. The uplift of column is significant affected by excavation area and time. Axial force of circular strut is larger than that of angle brace and radial support,and axial force of radial support is the smallest. The implementation and monitoring results show that entire support system achieves the goal of deformation retaining. It may provide a useful reference for the design and construction of similar foundation pit.
引文
[1]张陈蓉,蔡建鹏,黄茂松.基坑开挖对邻近地埋管线的影响分析[J].岩土工程学报,2010,32(S2):154-157.
[2]贺炜,潘星羽,张军,等.河心洲地铁车站深基坑开挖监测及环境影响分析[J].岩土工程学报,2013,35(S1):478-483.
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[11]雷扬,易念平,陆海丽.填土深基坑施工监测及失稳分析[J].广西大学学报(自然科学版),2015,40(4):978-983.
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[13]WONG I H,POH T Y,CHUAH H L.Performance of excavations for depressed expressway in Singapore[J].Journal of Geotechnical and Geoenvironmental Engineering,1997,23(7):617-625.
[14]LONG M.Database for retaining wall and ground Movements due to deep excavations[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):203-224.
[15]YOO C.Behavior of braced and anchored walls in soils overlying rock[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):225-233.
[16]徐中华,王建华,王卫东.上海地区深基坑工程中地下连续墙的变形性状[J].土木工程学报,2008,41(8):81-86.
[17]徐中华.上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D].上海:上海交通大学,2007.
[18]MOORMANN C.Analysis of wall and ground movements due to deep excavations in soft soil based on a new worldwide database[J].Soils and Foundations,2004,44(1):87-98.
[19]CLOUGH G W,O'ROURKE T D.Construction induced movements of in situ walls[C]//Proceedings of ASCE conference on design and performance of earth retaining structures.New York:Geotechnical Special Publication,1990:439-470.
[20]LEUNG E H Y,NG C W W.Wall and ground movements associated with deep excavations supported by cast in situ wall in mixed ground conditions[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(2):129-143.
[2]贺炜,潘星羽,张军,等.河心洲地铁车站深基坑开挖监测及环境影响分析[J].岩土工程学报,2013,35(S1):478-483.
[3]江杰,蒲鸥,刘刚伯,等.玉象隧道爆破振动监测与分析[J].广西大学学报(自然科学版),2016,41(6):1751-1755.
[4]丁智,王达,虞兴福,等.杭州地铁新塘路、景芳路交叉口工程深基坑监测分析[J].岩土工程学报.2013,35(S2):445-451.
[5]杨有海,土建军,武进广,等.杭州地铁秋涛路车站深基坑信息化施工监测分析[J].岩土工程学报,2008,30(10):1550-1554.
[6]张雪蝉,晓南,序源,.杭州庆春路过江隧道江南工作井监测分析[J].岩土力学,2011,2(增刊1):88-494.
[7]安关峰,高峻岳.广州地铁公园前地下空间深基坑综合支护监测分析[J].岩土工程学报,2007,29(6):872-879.
[8]王卫东,徐中华,王建华.上海地区深基坑周边地表变形性状实测统计分析[J].岩土工程学报,2011,33(11):1659-1666.
[9]徐中华,王建华,王卫东.软土地区采用灌注桩围护的深基坑变形性状研究[J].岩土力学,2009,30(5):1362-1366.
[10]陈宏东,都华,冯林平,等.深挖填土基坑监测及安全性分析[J].广西大学学报自然科学版,2010,35(2):205-209.
[11]雷扬,易念平,陆海丽.填土深基坑施工监测及失稳分析[J].广西大学学报(自然科学版),2015,40(4):978-983.
[12]OU C Y,HSIEH P G,CHIOU D C.Characteristics of ground surface settlement during excavation[J].Canadian Geotechnical Journal,1993,30(5):758-767.
[13]WONG I H,POH T Y,CHUAH H L.Performance of excavations for depressed expressway in Singapore[J].Journal of Geotechnical and Geoenvironmental Engineering,1997,23(7):617-625.
[14]LONG M.Database for retaining wall and ground Movements due to deep excavations[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):203-224.
[15]YOO C.Behavior of braced and anchored walls in soils overlying rock[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(3):225-233.
[16]徐中华,王建华,王卫东.上海地区深基坑工程中地下连续墙的变形性状[J].土木工程学报,2008,41(8):81-86.
[17]徐中华.上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D].上海:上海交通大学,2007.
[18]MOORMANN C.Analysis of wall and ground movements due to deep excavations in soft soil based on a new worldwide database[J].Soils and Foundations,2004,44(1):87-98.
[19]CLOUGH G W,O'ROURKE T D.Construction induced movements of in situ walls[C]//Proceedings of ASCE conference on design and performance of earth retaining structures.New York:Geotechnical Special Publication,1990:439-470.
[20]LEUNG E H Y,NG C W W.Wall and ground movements associated with deep excavations supported by cast in situ wall in mixed ground conditions[J].Journal of Geotechnical and Geoenvironmental Engineering,2007,133(2):129-143.