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针对杭州地区某市政隧道工程,采用“两墙合一”地下连续墙对原设计的钻孔咬合桩围护结构进行优化,通过将围护结构和主体结构合二为一的方法,可以很好地发挥连墙本身的抗拔和竖向承载力,同时可以取消部分隧道底部抗拔钻孔灌注桩,减少工程量,加快施工进度,经济效益显著。采用有限单元法对典型剖面进行计算,分别计算了开挖及运营期的位移与弯矩。有限元计算结果与运营期实测结果均表明,工程实施非常顺利,本文的研究结果对今后相关工程设计将提供有益的借鉴。
For a municipal tunnel project in Hangzhou, using “two walls one ” underground diaphragm wall of the original design of bite pile retaining structure to be optimized by combining the envelope and the main structure of the structure of the method can be It can well exert the anti-pull and vertical bearing capacity of the wall itself, and at the same time it can cancel part of the anti-pulling bored piles at the bottom of the tunnel, reduce the engineering quantity and speed up the construction progress, with obvious economic benefits. The finite element method was used to calculate the typical section, and the displacements and bending moment during excavation and operation were calculated respectively. The results of finite element analysis and the results of operation show that the project implementation is very smooth and the research results of this paper will provide useful reference for the related engineering design in the future.