浅谈沿海软土地区的坑中坑支护选型  

Discussion on theretaining structures of pit-in-pit excavation in coastal soft soil areas

作　　者：郑春婷 ZHENG Chunting(Fuzhou fuyou geotechnical engineering co.,LTD,,Fuzhou 350001)

机构地区：[1]福州福祐岩土工程有限公司,福建福州350001

出　　处：《福建建筑》2022年第1期79-84,共6页Fujian Architecture & Construction

摘　　要：沿海软土地区的坑中坑开挖面积小、施工速度快,因而没有引起足够的重视,由此造成许多不必要的工程事故和损失。根据沿海软土地区的地层特点,提出不同开挖深度下坑中坑的支护方式,例如放坡支护、土钉墙支护、钢沉井支护、悬臂桩支护、重力式挡墙支护、桩+内支撑支护等,为软土地区坑中坑的支护选型提供参考。最后,以宁德市某基坑作为工程案例,采用理正深基坑软件验证U型钢板桩+两道钢支撑超前支护坑中坑的可行性,进一步证明可根据工程实际情况,调整坑中坑的开挖顺序,达到双赢局面。The pit-in-pit excavation caused a lot of unnecessary engineering accidents and losses in coastal soft soil areas, because the excavation area is small and the excavation speed is fast, so we didn’t draw enough attention to them.According to the stratigraphic characteristics of the coastal soft soil areas, this paper puts forward the retaining structures of the pit-in-pit excavations with different excavation depth, such as slope retaining structure, soil nailing wall retaining structure, steel caisson retaining structure, cantilever pile retaining structure, gravity retaining wall retaining structure, pile and internal retaining structure, etc, to provide reference for the selection of pit-in-pit retaining structures in soft soil areas.Finally, taking a pit-in-pit excavation in ningde city as an engineering case, lizheng deep excavations software is used to verify the feasibility of u-shaped steel sheet pile + two steel supports in advance supporting pit-in-pit, which further shows that the excavation sequence can be adjusted according to the actual situation of the project to achieve a win-win situation.

关 键 词：沿海软土地区 深厚软土 坑中坑支护形式 

分 类 号：TU4[建筑科学—土工工程]