山岭隧道洞口段围岩变形特征分析

发布时间：2019-05-31 21:40

【摘要】：为了研究山岭隧道洞口段围岩变形特征,以贵州省晴隆-兴义高速公路登攀隧道为工程依托,对洞口段围岩变形展开研究,通过对现场围岩变形进行监测和数据处理,分析了山岭隧道洞口段围岩变形的时间与空间效应,进而对山岭隧道洞口段围岩变形时间特征和空间特征展开研究。研究结果表明:隧道开挖引起围岩变形具有明显的时间效应和空间效应,监测断面围岩变形在开挖后历经8 d和27 m~30 m后稳定;山岭隧道洞口段围岩变形具有明显的空间特征,周边收敛值在时间轴上规律性较差,但累计变形量较小,对隧道围岩稳定性影响有限;洞口段拱顶沉降与地表沉降时间历程曲线有明显的规律,但累计变形量、分布特征与围岩本身属性紧密相关,地域差异性较大。
[Abstract]:In order to study the deformation characteristics of surrounding rock in the entrance section of Shanling tunnel, based on the climbing tunnel of Qinglong-Xingyi Expressway in Guizhou Province, the deformation of surrounding rock in the entrance section of the tunnel is studied, and the deformation of surrounding rock in the field is monitored and processed. The time and space effects of surrounding rock deformation in the entrance section of mountain tunnel are analyzed, and then the temporal and spatial characteristics of surrounding rock deformation in the entrance section of mountain tunnel are studied. The results show that the deformation of surrounding rock caused by tunnel excavation has obvious time effect and spatial effect, and the deformation of surrounding rock of monitoring section is stable after 8 days and 27 m 鈮，

本文编号：2490031