某基坑支护变形超限之处置  

Mitigation of Excessive Deformation in the Supporting Structure for a Deep Excavation

作　　者：张启 王天宝 冯科明 彭占良 ZHANG Qi;WANG Tianbao;FENG Keming;PENG Zhanliang(Beijing Urban Exploration&Surveying Design Institute Co.Ltd.,Beijing 100101;Beijing Key Laboratory of Geotechnical Engineering for Deep Excavation of Urban Rail Transit,Beijing 100101)

机构地区：[1]北京城建勘测设计研究院有限责任公司,北京100101 [2]城市轨道交通深基坑岩土工程北京市重点实验室,北京100101

出　　处：《土工基础》2021年第3期251-253,共3页Soil Engineering and Foundation

摘　　要：某基坑工程采用拉森钢板桩支护体系,由于实际开挖工况与施工组织和原设计工况相差太大,使得局部基坑支护体系出现了较大位移,而且不收敛,超过了设计限定的支护体系变形预警值,甚至控制值。经过现场踏勘,对支护体系变形原因进行分析,采取了对支护体系外侧削土卸载,坑内堆土反压等方式进行处置,使基坑支护体系的水平位移得到了有效地控制,从而使得基坑整体开挖及基础施工顺利实施。A Larson steel sheet pile system was used in a deep excavation supporting project.Due to the large difference between the actual excavation condition and the conditions assumed in the design,the partial deep excavation support system was observed to have an excessive lateral displacement and the deformation did not converge,which exceeds the deformation threshold value and even the control value of the design limit.After the field survey,factors that might induce the excessive deformation in the support system were analyzed.Mitigation measures of soil removal unloading at the outside of the support system,as well as the constructing soil berm inside the excavation side,were implemented so that the horizontal displacement of the deep excavation supporting system was effectively controlled.As a result,the overall excavation and foundation construction could be proceeded smoothly.

关 键 词：拉森钢板桩 基坑工程 支护型式 应急处置 

分 类 号：TU473[建筑科学—结构工程]