建筑荷载对下穿隧道作用算法的研究  

Research on the Algorithm of the Action of Building Loads on Underpass Tunnels

作　　者：幸芊 洪兆远 刘成章 刘玉 柏湘 XING Qian;HONG Zhaoyuan;LIU Chengzhang;LIU Yu;BAI Xiang(CMCU Engineering Co,Ltd,Chongqing 400039,China)

机构地区：[1]中机中联工程有限公司,重庆400039

出　　处：《土木工程与管理学报》2023年第6期15-22,31,共9页Journal of Civil Engineering and Management

基　　金：重庆市高新技术企业科技研发项目(RD2022009);中机中联工程有限公司科研项目(KY2022004)。

摘　　要：针对建筑荷载对下穿隧道作用大小的计算,建筑基础工程采用布新纳斯克理论方法,隧道工程采用普氏平衡拱理论和太沙基岩石力学理论方法,本文整理并讨论了以上常用理论方法及存在的问题。通过数值分析,提出对现有理论进行整合与优化的实用方法,研究表明:(1)建筑荷载对隧道的作用可通过“错动体”稳定性分析进行分类,“错动体”稳定时按附加荷载扩散方式计算,不稳定时按太沙基极限平衡理论计算;(2)附加荷载扩散角与埋深呈正相关的关系;(3)隧道开挖引起的附加荷载增大系数建议不小于1.1;(4)“错动体”不稳定时,隧道衬砌承受的荷载可按本文提出的极限平衡法计算;(5)通过工程案例的应用对比,本文提出的理论公式结果与数值分析结果较接近。For the calculation of building loads on underpass tunnels,Boussinesq theory is used for building foundation engineering,and PU’s equilibrium arch theory and Terzaghi rock mechanics theory are used for tunnel engineering.This paper organizes and discusses the above commonly used theoretical methods and the problems that exist in them.Through numerical analysis,the practical method for integrating and optimizing the existing theories is proposed,and the study shows that:(1)the role of building loads on tunnels can be classified through the stability analysis of“staggered body”,and when“staggered body”is stable,it is calculated according to the additional load diffusion method,when it is unstable,it is calculated according to the Terzaghi limit equilibrium theory;(2)The angle of additional load diffusion is positively correlated with the buried depth;(3)The coefficient of additional load increase caused by tunnel excavation is suggested to be no less than 1.1;(4)When the“staggered body”is unstable,the load borne by the tunnel lining can be calculated according to the limit equilibrium method proposed in this paper;(5)Through the comparison of the application of engineering cases,the theoretical formulas results proposed in this paper are closer to the numerical analysis results.

关 键 词：城市隧道 建筑荷载 附加应力 计算方法 数值分析 

分 类 号：TU470[建筑科学—结构工程]