摘要
圆形地下连续墙具有自身稳定性好、整体性强及变形小等优点。超深基坑采用圆形地连墙围护型式,能显著降低地连墙的嵌固深度。套铣接头的使用能充分发挥圆筒形地连墙的力学性能;此外,应根据具体的工程地质和水文地质条件并结合基坑的建筑使用功能,合理布置坑内环梁体系与圆筒形地下连续墙共同受力,以弥补圆形地连墙由于几何尺寸误差所产生的刚度损失。结合南京市纬三路过江通道工程中间风井这一工程实例,对上述各方面及相关结构设计方法进行了探讨和总结,并得出了一些有益结论。
The circular underground diaphragm wall has many advantages,such as remarkable special effect,good stability,perfect integrity and small deformation etc.The embedded depth of diaphragm retaining wall could be remarkably reduced by adopting circular underground diaphragm wall structures for ultra-deep circular foundation excavation in soft soil.The mechanical behavior of cylindrical underground diaphragm wall could be fully developed by using the connector cuttings.Furthermore,according to site engineering geology,hydrological condition,and the service function of excavation,designers should make proper arrangement of ring beams and circular underground diaphragm walls to make them sharing the force so that they can make up for the stiffness loss of circular underground diaphragm wall due to dimension error.Based on case of the middle airshaft of under-river tunnel project in Nanjing city,the above aspects and relating structure designs have been discussed and summarized,so some beneficial conclusions were derived.
出处
《土工基础》
2010年第6期15-18,共4页
Soil Engineering and Foundation
关键词
圆形地连墙
空间效应
套铣接头
软弱土
circular underground diaphragm wall
special effects
connector cutting
soft soil
