摘要
为减少浅埋偏压隧道洞口段的施工风险,有效控制洞口段的围岩变形。以贵州玉石高速白岩湾隧道进口段施工为例,对超前管棚、偏压挡墙联合支护方案进行三维数值模拟分析,并与实际工程监测结果进行对比,探讨联合支护方案在浅埋偏压隧道洞口施工中的支护效果。研究结果表明:在浅埋偏压隧道进口段变形控制方面,采用超前管棚、偏压挡墙联合支护方案与未支护的工况相比,联合支护能有效控制隧道的拱顶下沉、周边收敛及地表沉降,实际工程监测数据也验证了数值模拟结果的准确性。在浅埋偏压隧道洞口段施工过程中,超前管棚、偏压挡墙联合支护方案可靠有效,可为类似工程提供参考。
In order to reduce the construction risk of the portal section of shallow buried tunnel with bias pressure,the deformation of surrounding rock was effectively controlled.Taking the construction of the entrance section of the tunnel of expressway in Yushi county,Guizhou province as an example,the three-dimensional numerical simulation model was established to analyse the combined support scheme of advanced pipe shed and biased retaining wall.Compared with the monitoring results,the supporting effect of the combined support scheme was discussed.The results show that the deformation of surrounding rock at the portal section of shallow bias tunnel can be controlled satisfactorily using the combined support.The sink of tunnel at vault,the convergence of wall,the subsidence of surface can be effectively limited.The accuracy of the numerical simulation results is also verified by the monitoring data.Therefore,the combined support scheme of advanced pipe shed and bias retaining wall can be considered as a reliable and effective support in the construction process of the entrance of shallow buried tunnel with bias pressure.The research can provide reference for similar projects.
作者
姜冰
常树芳
王方立
樊毅华
赵超
JIANG Bing;CHANG Shu-fang;WANG Fang-li;FAN Yi-hua;ZHAO Chao(Road&Bridge South China Engineering Co.,Ltd.,Zhongshan 528403,Guangdong,China)
出处
《交通科学与工程》
2021年第4期78-84,107,共8页
Journal of Transport Science and Engineering
关键词
浅埋偏压隧道
超前管棚
偏压挡墙
数值模拟
监控量测
shallow buried bias tunnel
advanced pipe shed
biased retaining wall
numerical simulation
monitoring measurement
