基于弯矩最小化的地铁盾构隧道横断面优化设计分析  

Analysis for Optimal Design of Cross Section of Metro Shield Tunnel Based on Minimum Bending Moment

作　　者：黄大维[1] 冯青松[1] 刘开富[2] 张鹏飞[1] 唐柏赞 涂文博 HUANG Dawei;FENG Qingsong;LIU Kaifu;ZHANG Pengfei;TANG Baizan;TU Wenbo(Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 330018,China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013 [2]浙江理工大学建工学院,浙江杭州310018

出　　处：《铁道学报》2018年第9期159-166,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51608200)

摘　　要：盾构隧道在过大弯矩作用下易发生横椭圆变形超限,且纵缝接头易发生结构病害,因此提出尽量减小弯矩的盾构隧道横断面设计理念。首先提出了零弯矩盾构隧道概念,得到其横断面合理轴线的结构力学模型与解析表达式,以及零弯矩盾构隧道横断面关键参数的计算公式。考虑到一条或多条地铁线路只能选用一种盾构隧道横断面,为此给出了基于弯矩最小化的盾构隧道横断面设计方法,即采用加权平均法确定零弯矩盾构隧道横断面设计的土压力参数,并给出了基于弯矩最小化的盾构隧道隧道横断面设计流程。基于弯矩最小化设计盾构隧道横断面的目的是最大限度地减小全线盾构隧道的弯矩,相比传统的圆形横断面,弯矩最小化盾构隧道横断面的弯矩有了大幅度地减小。Under the action of excessive bending moment,the shield tunnel is prone to transfinite transverse elliptical deformations and the longitudinal joint is prone to structural damage.To address this issue,the idea of minimum bending moment for cross section design of metro shield tunnel was proposed in this paper.Firstly,the concept of no bending moment shield tunnel was presented.Further more,the structural mechanical calculation model and analytical expression of rational axis for no bending moment shield tunnel were obtained,and the computational formulas of key parameters for no bending moment shield tunnel were given.Considering that one or more metro lines can only choose one kind of shield tunnel cross section,a cross-sectional design method of shield tunnel based on minimum bending moment was given,that is,the weighted average method was adopted to determine the earth pressure design parameters for the cross section of no bending moment shield tunnel.Additionally,the design flow chart for minimum bending moment shield tunnel was given.The purpose of designing the cross section of the shield tunnel based on minimum bending moment is to minimize the bending moment for the whole metro line.Compared with traditional circular cross section,the bending moment of the minimum bending moment shield tunnel cross section has been largely reduced.

关 键 词：盾构隧道 零弯矩 横断面 弯矩最小化 设计方法 

分 类 号：TM922[电气工程—电力电子与电力传动]