摘要
对13座黄土隧道28个监测断面复合衬砌间接触压力的实测数据进行统计分析,研究黄土隧道二次衬砌受力的总体分布特征及其与围岩级别、隧道埋深、开挖跨度的关系,并讨论接触压力时程变化的基本规律及空间分布规律。研究结果表明,隧道接触压力随埋深和开挖跨度的增大而增大,其时程发展经历了先增大到峰值再下降一段,而后不断增大并趋于稳定的历程,接触压力沿洞周总体表现出由拱顶→拱肩→拱腰→拱墙脚逐渐增大的空间分布规律。研究方法和成果对分析黄土隧道初期支护与二次衬砌间的接触压力分布规律和完善支护结构设计方法具有一定的参考价值。
Based on statistical analysis of mechanical characteristics of secondary lining for 28 monitoring cross-sections of13 loess tunnels in the literatures,the population distribution characteristics of the contact pressure between primary support and secondary lining,and their relationship with their classification grade,buried depth and excavation span of tunnels were studied. Through the statistical analysis of in-situ monitoring data of the contact pressure,the variation law with time-change and the spatial distribution law were studied. The research results showed that the contact pressure of the tunnel increased with the increase of the buried depth and the excavation span,and its time history experienced a process of first increasing to the peak value and then decreasing for a period of time,and then continuously increasing and tending to be stable. The contact pressures around the tunnel circumference gradually increased from the crown→the arch shoulder→the arch waist→the arch foot. The research conclusion of this paper has some reference value in analyzing the pressure mechanism of loess tunnels and perfecting the design method of supporting structure.
作者
李鹏飞
王帆
LI Pengfei;WANG Fan(Key Lab of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《隧道与地下工程灾害防治》
2021年第2期16-22,共7页
Hazard Control in Tunnelling and Underground Engineering
基金
国家自然科学基金资助项目(51778025
51978019)。
关键词
黄土隧道
接触压力
现场监测
时程曲线
空间分布
loess tunnel
contact pressure
in-situ monitoring
time-history curves
space distribution
