京张高铁八达岭长城站大跨深埋三连拱围岩压力计算方法研究  

Study on Calculation Method for Surrounding Rock Pressure of Large-span Deep Buried Three-arch Based on the Badaling Great Wall Station on Beijing-Zhangjiakou High-speed Railway

作　　者：王婷 赵继 魏盼 WANG Ting;ZHAO Ji;WEI Pan(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China;Beijing Urban Construction Design and Development Group Co.,Ltd,Beijing,100037,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]北京城建设计发展集团股份有限公司,北京100037

出　　处：《铁道标准设计》2020年第1期57-62,共6页Railway Standard Design

基　　金：中国铁路总公司科技研究开发计划重大课题(2014G004-C,2017G007-B)

摘　　要：大跨度深埋三连拱隧道具有开挖跨度大、施工工序复杂、各洞室协同受力等特点,支护结构设计需要进行荷载-结构模型验算,而荷载如何确定尚无成熟的计算方法。依托京张高铁八达岭长城站三连拱隧道工程,基于普氏平衡拱基本假定并借鉴深埋双连拱隧道荷载计算方法,推导出深埋三连拱情况下围岩压力计算解析解。研究表明:三连拱隧道围岩压力由拱部松散土压力和中隔墙共同承担;中隔墙的主动支撑作用非常重要,这与双连拱隧道的受力变化规律吻合;该计算方法适用于具备一定强度的接近松散体围岩;通过解析法计算结果与现场监测数据对比分析,水平与竖向围岩压力最大相对误差分别为9.75%和10%,验证解析法计算结果的合理性。Long-span deep-buried three-arch tunnels have the characteristics of large excavation span,complex construction process and each cavern bears forces cooperatively.Usually the support structure design needs load-structure model checking calculation,but there has been no mature calculation method to determine the load.Under this background and with reference to the three-arch arch project of Badaling Great Wall Station on the Beijing-Zhangjiakou High-speed Railway,the analytical solution of surrounding rock pressure calculation under the condition of deep-buried three-arch tunnel is derived based on the basic assumption of Pu’s equilibrium arch and the load calculation method of deep-buried double-arch tunnel.Research results show that the surrounding rock pressure of the three-arch tunnel is determined jointly by the loose earth pressure at the arch and the middle partition wall;the active support function of the middle partition wall is very important,which is identical to the law of stress variation of double-arch tunnel;the calculation method is applicable to surrounding rock with certain strength near the loose surrounding rock;the comparison and analysis of the analytical calculation results and field monitoring data indicate that the maximum relative errors of the horizontal and vertical surrounding rock pressure are 9.75%and 10%respectively,and verify the rationality of the analytical method.

关 键 词：京张高铁 铁路隧道 大跨度隧道 深埋隧道 三连拱 围岩压力 解析法 

分 类 号：U451.1[建筑科学—桥梁与隧道工程]