复杂环境条件下EPC工程深大基坑组合式围护设计与施工

Design and Construction of Combined Type Enclosure for Deep and Large Foundation Pit of EPC Project under Complex Environmental Conditions

以邻近箱涵、已建建筑物的超大深基坑工程为背景,综合考虑EPC合同条件下经济性、施工工期等因素,分析基坑周边不同的支护条件,分别采用了放坡、桩锚支护、桩撑支护等多种支护形式的组合。工程实践表明,基坑侧壁土体水平位移和周边箱涵、管线、建筑物沉降变形较小。组合式围护结构体系在复杂环境条件下可取得良好的社会和经济效益,为类似项目提供了借鉴。

Taking the ultra-large deep foundation pit engineering adjacent to box culverts and built buildings and considering the factors such as economy and construction period under EPC contract conditions,the different support conditions around the foundation pit are analyzed.Additionally,various support forms,such as slope grading,pile-anchor support,and pile support,are adopted in combination.The engineering practice shows that the horizontal displacement of the soil on the sidewalls of the foundation pit and the settlement deformation of the surrounding box culverts,pipelines and buildings are small.Consequently,the combined enclosure structure system can achieve significant social and economic benefits under complex environmental conditions,providing a reference for similar projects.