浅埋铁路隧道下穿高速公路施工方法比选

发布时间：2018-11-15 17:25

【摘要】：采用三维数值模拟方法,着重从开挖全过程结构体系转换和施工过程的空间效应的角度,分析比较了覆跨比小于1的浅埋铁路隧道下穿高速公路施工采用不同施工方法时的拱顶和地表沉降、衬砌变形和结构体系内力等关键参数的变化.计算结果表明,尽管双侧壁导坑法在开挖过程中断面较小,但由于分块多,前后掌子面滞后距离长,施工过程复杂,结构体系转换频繁,因而在地表沉降控制方面较中隔壁法并不具有明显的优势.而中隔壁法由于分块相对较少,各工序衔接紧密,拱顶沉降和地表沉降控制较好.其中CRD法由于采用了临时仰拱,对洞周收敛和中隔壁的变形较CD法具有更好的控制作用.基于施工全过程的不同开挖方法的三维数值分析比选研究对于选择恰当的施工方法并确保工程顺利实施具有重要意义.
[Abstract]:In this paper, the three-dimensional numerical simulation method is used to analyze the structural system transformation and the spatial effect during the whole excavation process. This paper analyzes and compares the changes of key parameters, such as arch roof and surface settlement, lining deformation and internal force of structure system, in the construction of shallow buried railway tunnel underpass highway with overpass ratio less than 1. The calculation results show that although the section of the method is small in the excavation process, due to the large number of blocks, the lag distance between front and rear face is long, the construction process is complicated, and the structural system conversion is frequent. Therefore, there is no obvious advantage in the control of surface subsidence over that of the middle adjoining method. However, due to the relatively small number of blocks and the close connection of each working procedure, the dome settlement and surface subsidence are well controlled by the middle and adjoining method. The CRD method has a better control effect on the convergence of the hole circumference and the deformation of the middle wall than the CD method because of the use of temporary inverted arch. The comparative study of 3D numerical analysis of different excavation methods based on the whole construction process is of great significance for the selection of appropriate construction methods and for ensuring the smooth implementation of the project.
【作者单位】：东北大学资源与土木工程学院;沈阳新大陆建筑设计有限公司;中铁十三局集团有限公司;
【基金】：国家科技支撑计划子课题资助项目(2012BAK24B0104) 国家自然科学基金资助项目(51304036)
【分类号】：U455.4

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