摘要
深中通道伶仃洋大桥东锚碇为海中八字形地连墙锚碇,地连墙直径长107.1m,宽65m,地连墙厚度1.5m,基坑开挖深度42m,总开挖方量约22万m^(3)。锚碇基础采用逆作法,每开挖4m施工3m内衬,内衬均为吊模施工,施工风险高,施工功效低。采用理正、Flac3d、Abaqus软件对基坑开挖全过程进行对比分析,得到施工过程中地连墙最大深层水平位移分别为20.15mm、12.03mm、10.0mm,均小于设计值(25mm),其三维模型计算结果与实际监控结果(10.3mm)较接近。同时,采用"出土门架+伸缩臂挖机"复合式出土工艺,日均出土量超过2 000m^(3),确保了基坑开挖过程中的结构安全和施工功效。
The east anchorage of the Lingdingyang Bridge on Shenzhen-Zhongshan Link is an anchorage of the wing-shaped diaphragm structure in the sea.The diaphragm is 107.1 min diameter,65 m in width and 1.5 min thickness,and the excavation depth of the foundation pit is 42 m.The total excavation volume is 220000 square meters.The anchorage foundation is built by the reverse construction method.Excavation of every 4 mis followed by construction of 3 minner lining by hanging formwork,which is featured by high construction risk and low construction efficiency.Through comparative analysis of the whole process of foundation pit excavation by Lizheng,Flac3 dand Abaqus,the maximum deep horizontal displacement of the diaphragm during the construction process is respectively 20.15 mm,12.03 mm,and 10.0 mm,all being smaller than the design value(25 mm),and its calculation result by threedimensional model is close to the actual monitored result(10.3 mm).At the same time,the combined excavation process of "excavation mast + telescopic boom excavator"is adopted.The average daily excavation volume exceeds 2000 cubic meters,which ensures the structural safety and construction efficiency of the foundation pit excavation.
作者
李冕
李思吟
袁航
LI Mian;LI Si-yin;YUAN Hang(Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430014,China;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430014,China)
出处
《公路》
北大核心
2021年第10期130-134,共5页
Highway
关键词
海中锚碇
深基坑
地连墙
复合式出土
施工技术研究
anchorage in the sea
deep foundation pit
diaphragm
compound excavation
study of construction techniques
