浅埋大跨地铁隧道主动围岩压力计算方法研究  

Study on Calculation Method of Active Surrounding Rock Pressure in Shallow and Large Span Metro Tunnel

作　　者：韩强 郭昊 许志康 董夏 Han Qiang;Guo Hao;Xu Zhikang;Dong Xia(The Third Construction Co.,Ltd.,China Railway Fourth Bureau Group,Beijing 100016,China;School of Civil&Architecture Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁四局集团第三建设有限公司,北京100016 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《市政技术》2022年第1期18-22,31,共6页Journal of Municipal Technology

摘　　要：隧道拱部主动围岩压力是隧道结构设计的重要依据,虽然目前对于超浅埋隧道和深埋隧道的主动围岩压力计算方法已经很成熟,但是地铁设计规范对于隧道覆土深度/隧道跨度之比在1到1.5倍的浅埋隧道拱部主动围岩压力并未给出明确计算方法。因此,依托北京地铁12号线三元桥站—芳园里站区间停车线大跨隧道工程,分别采用全土柱法、谢家烋法、主应力轴旋转法和地层结构法等4种计算方法,计算了隧道拱部主动围岩压力。通过对计算结果的对比分析,推荐采用主应力轴旋转法和地层结构法作为该工程大断面浅埋隧道的主动围岩压力计算方法;若采用谢家烋法计算主动围岩压力,则建议采用0.4~0.6的折减系数对主动围岩压力计算结果进行折减。The active surrounding rock pressure of tunnel arch is an important basis of tunnel structure design. The current calculation methods of the active surrounding rock pressure for ultra-shallow and deep buried tunnels have been very mature. However, the subway design code does not provide a clear calculation method for the active surrounding rock pressure of shallow buried tunnels with the ratio of soil depth to tunnel span between 1 and 1.5 times.Based on the long span tunnel project of the parking line between Sanyuanqiao Station and Fangyuan Station of Beijing Metro Line 12, the active surrounding rock pressure of the tunnel is calculated by four methods, namely,total soil column method, Xie Jiajie method, principal stress axis rotation method and stratum structure model. By comparing and analyzing the calculation results of various methods, the main stress axis rotation method and the formation structure method are recommended for the project. If Xie Jiajie’s method is used, it is suggested that the reduction coefficient of 0.4~0.6 should be applied to reduce the calculated results of the active surrounding rock pressure.

关 键 词：浅埋大跨隧道 主动围岩压力 计算方法 全土柱理论 极限平衡方法 主应力轴旋转 地层-结构模型 

分 类 号：U231.3[交通运输工程—道路与铁道工程] U451.2[建筑科学—桥梁与隧道工程]