2017年6月上 施工技术 第46卷第11期 CONSTRUCTION TECHNOLOGY 77 D0I:10.7672/5j52017110077 基于层次分析法的浅埋大跨城市隧道扁平率优化研究 武明静 (中铁十二局集团第二工程有限公司，山西太原030032) [摘要]对浅埋大跨城市隧道而言，合理的扁平率设计对于节约成本和提高结构安全性都有至关重要的作用.依 托某典型工程，提出基于层次分析法原理的扁平率优化流程.首先对该工程的地质条件进行分层概化，确定地层 及支护的物理力学参数和备选的扁平率，建立数值模型网格，利用有限差分软件模拟5种不同扁平率下隧道地层 与支护的力学响应；再通过层次分析法对影响隧道经济性、稳定性与安全性的开挖面积、地表沉降、拱顶沉降、水平 位移、支护受力特性及塑性区面积进行优化并计算其权值，最终选出最优的扁平率. [关键词]隧道工程；扁平率：优化；层次分析法；数值模拟 [中图分类号]U445.4 [文献标识码]A [文章编号]1002-8498(2017)11-0077-05 Study on Flat Ratio Optimization of Large-span Shallow Buried City Tunnel Based on Analytic Hierarchy Process WU Mingjing The 2nd Engineering Co.Lad.of China Railway 12th Bureau Group Co.Ltd.Taiyuan Shanxi 030032 China) Abstract:The design of reasonable flat ratio for large-span shallow buried city tunnel has very important effect on cost saving and structural safety improving.Based on some typical tunnel engineering the method of evaluating stability of surrounding rock called failure degree index FDI)and the flat ratio optimization flow based on analytic hierarchy process AHP)is proposed.Firstly on the basis of the hierarchy of generalized geological conditions the physical and mechanical parameters for stratum and support structure and the alternative flat ratio are determined.With the finite difference software FLAC3D. numerical model grids are built to simulate the mechanical response between stratums and support under 5 kinds of flat ratios.Then target values of excavation area ground surface settlement vault subsidence h...
基于层次分析法的浅埋大跨城市隧道扁平率优化研究.pdf
