组合式非闭合支撑体系在软土浅基坑工程中的应用及分析
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摘要
开挖深度在7m以下的软土浅基坑可以根据具体工程条件分别使用钢筋混凝土支撑和钢管支撑、型钢斜抛撑,形成非闭合式支撑体系,通过多种支护方式的组合,完成基坑开挖围护工程。通过上海某软土浅基坑的分区分块组合式设计,对组合式非闭合支撑体系的工程应用进行介绍,分析了钢筋混凝土支撑和钢管支撑以及型钢斜抛撑各自的适用范围和设计要点,基坑设计可根据各个部位的工程情况,进行水泥土搅拌桩重力墙、SMW工法桩等板式围护结构的平面组合式围护体系。通过支撑部位的PLAXIS数值模拟和开挖过程位移监测,对软土基坑的变形特点进行分析和总结,为软土地区类似的大面积浅基坑工程设计提供相关参考和工程经验。
In the selection of the suitable supporting systems for the deep excavation supporting for the excavation depth less than seven meters,several rake systems are available.They are:reinforced concrete rakes;steel pipe rakes;rolled steel rakes;or the unclosed raking system from combination of above methods.This paper presents a case history of utilizing an unclosed rake system that from the combination of supporting methods used in various excavation areas in a deep excavation in Shanghai soft soils.Following an introduction of the overall project excavation support information,the application of various rakes,such as,reinforced concrete,steel pipe and rolled steel,as well as their critical design aspects are presented.The vertical face of the excavation could be gravity wall consisting of soil-cement mixed columns,soil-cement mixed wall(SMW).The paper also presents the predicted deformation in the supporting system using numerical analysis by PLAXIS.The predicted deformation results are comparable to the monitored data.
In the selection of the suitable supporting systems for the deep excavation supporting for the excavation depth less than seven meters,several rake systems are available.They are:reinforced concrete rakes;steel pipe rakes;rolled steel rakes;or the unclosed raking system from combination of above methods.This paper presents a case history of utilizing an unclosed rake system that from the combination of supporting methods used in various excavation areas in a deep excavation in Shanghai soft soils.Following an introduction of the overall project excavation support information,the application of various rakes,such as,reinforced concrete,steel pipe and rolled steel,as well as their critical design aspects are presented.The vertical face of the excavation could be gravity wall consisting of soil-cement mixed columns,soil-cement mixed wall(SMW).The paper also presents the predicted deformation in the supporting system using numerical analysis by PLAXIS.The predicted deformation results are comparable to the monitored data.
引文
[1]基坑工程技术规范(DG/TJ08-61-2010)[S].上海:上海市城乡建设和交通委员会,2010.
[2]李苏春,袁运涛.斜撑在基坑抢险过程中的应用[J].土工基础,2012,26(5):7-9.
[3]藏光文.软土地基深基坑工程不同围护结构的实测变形研究[J].土工基础,2014,28(3):59-61.
[4]王卫东,王建华.深基坑支护结构与主体结构相结合的设计、分析与实例[M].中国建筑工业出版社,2007.
[5]尹骥.小应变硬化土模型在上海地区深基坑工程中的应用[J].岩土工程学报,2010,32(S1):166-172.
[6]张如林,徐奴文.基于PLAXIS的深基坑支护设计的数值模拟[J].结构工程师,2010,26:131-136.
[2]李苏春,袁运涛.斜撑在基坑抢险过程中的应用[J].土工基础,2012,26(5):7-9.
[3]藏光文.软土地基深基坑工程不同围护结构的实测变形研究[J].土工基础,2014,28(3):59-61.
[4]王卫东,王建华.深基坑支护结构与主体结构相结合的设计、分析与实例[M].中国建筑工业出版社,2007.
[5]尹骥.小应变硬化土模型在上海地区深基坑工程中的应用[J].岩土工程学报,2010,32(S1):166-172.
[6]张如林,徐奴文.基于PLAXIS的深基坑支护设计的数值模拟[J].结构工程师,2010,26:131-136.