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本文以首都机场中央跑道下穿隧道设计施工为案例,论述了导洞施工方案的可行性和正确性。文章从荷载推导及计算模型入手,选取单导洞纵向一步开挖循环即一榀钢架为平面计算单元。上、下导洞全挖空时的钢架及砼框架的内力与变形计算。计算软件采用SAP2000。施工工程中,对钢架的内力与变形进行了实测验证与分析对比,找出了偏差原因,得出了工程结论。
Taking the design and construction of the tunnel under the central runway of Capital Airport as an example, this paper discusses the feasibility and correctness of the construction plan of the pilot tunnel. Starting from the load derivation and calculation model, the paper chooses the longitudinal excavation cycle of a single pilot tunnel as a flat computing unit. Calculation of Internal Forces and Deformations of Steel Frames and Concrete Frames with Upper and Lower Guide Poles Fully Excavated. Calculation software using SAP2000. In the construction project, the internal force and deformation of the steel frame were verified and compared with the actual test, the reason for the deviation was found, and the engineering conclusion was obtained.