深埋无中导洞连拱隧道过程荷载计算方法研究OA
Calculation method for rock pressure of deeply buried multi-arch tunnel without middle drift
无中导洞连拱隧道规避了传统连拱隧道施工工序繁杂、应力转换频繁等缺点,近年来取得了越来越广泛的应用,而该新型结构的围岩压力计算方法并未有统一的标准可循.基于普氏理论及过程设计方法,考虑先行洞支护结构对后行洞塌落拱高度的抑制作用及后行洞开挖对先行洞围岩压力的加剧影响,建立了深埋无中导洞连拱隧道过程荷载计算方法,最后通过与典型工程现场监控量测结果及参考文献计算方法比对分析.研究结果表明,通过应力分布组合的方式确定先行洞支护结构支撑能力能够量化对后行洞围岩压力的抑制作用;定量分析影响围岩压力的 4 个主要因素影响程度(围岩级别S(32.66%)、先行洞开挖宽度W1(28.02%)、后行洞开挖宽度W2(22.34%)、先行洞支护强度G(16.99%)),使得后行洞开挖对先行洞围岩压力影响系数的取值更加合理.通过对深埋无中导洞连拱隧道过程荷载计算方法的求解,能够为无中导洞连拱隧道支护结构提供较为科学合理的设计依据.
Multi arch tunnels without central guide tunnels avoids the drawbacks of traditional multi arch tunnel construction processes such as complexity and frequent stress conversion.In recent years,it has been widely used in China,but there is no unified standard for calculating the surrounding rock pressure of this new structure.Based on the Prussian theory and process design method,considering the inhibitory effect of the support structure of the advance tunnel on the collapse arch height of the subsequent tunnel and the intensifying effect of the excavation of the subsequent tunnel on the surrounding rock pressure of the advance tunnel,a process load calculation method for deep buried multi arch tunnels without a central guide tunnel is established.Finally,the rationality of the process load calculation method is verified by comparing and analyzing with the monitoring and measurement results of typical engineering sites and reference calculation methods.The research results indicate that determining the support capacity of the advance tunnel support structure through the combination of stress distribution can quantify the inhibitory effect on the surrounding rock pressure of the subsequent tunnel.Quantitative analysis of the four main factors that affect the degree of influence on surrounding rock pressure(rock level S(32.66%),excavation width W1(28.02%)of the front tunnel,excavation width W2(22.34%)of the rear tunnel,and support strength G(16.99%)of the front tunnel)makes the value of the coefficient of influence of rear tunnel excavation on the surrounding rock pressure of the front tunnel more reasonable.By solving the process load calculation method for deep buried multi arch tunnels without central guide tunnels,a more scientific and reasonable design basis can be provided for the support structure of multi arch tunnels without central guide tunnels.
ZHANG Jian;SUN Weiyu;YAN Songhong;WANG Yonggang;WANG Wen
School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China||Gansu Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730030,ChinaSchool of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China||Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou 730070,ChinaSchool of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China||Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou 730070,ChinaGansu Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730030,ChinaGansu Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou 730030,China
交通工程
连拱隧道普氏理论过程荷载最大隶属度原则
multi-arch tunnelProtodyakonov's theoryprocess loadprinciple of maximum affiliation
《岩土工程学报》 2026 (1)
45-53,9
国家自然科学基金项目(52208392,52068044,U2468217)中国博士后科学基金项目(2021M693843)甘肃省交通运输厅科技项目(2024-48)This work was Supported by National Natural Science Foundation of China(Grant Nos.52208392,52068044 and U2468217),China Postdoctoral Science Foundation(Grant No.2021M693843),and Gansu Provincial Department of Transportation Science and Technology Projects(Grant No.2024-48).
评论