基于现场监测统计的隧道围岩压力特征分析  

Analysis on Tunnel Surrounding Rock Pressure Characteristics Based on Field Measured Statistics

作　　者：梁庆国[1,2,3] 房军 贺谱 Liang Qingguo;Fang Jun;He Pu(National Demonstration Center for Experimental Civil Engineering Education,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China;Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou 730070,P.R.China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China;China Railway Siyuan Suvey and Design Group Co.,Ltd.,Wuhan 430063,P.R.China)

机构地区：[1]兰州交通大学土木工程国家级实验教学示范中心,兰州730070 [2]甘肃省道路桥梁与地下工程重点实验室,兰州730070 [3]兰州交通大学土木工程学院,兰州730070 [4]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《地下空间与工程学报》2020年第2期555-566,共12页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41562013)。

摘　　要：利用现场监测结果反分析隧道结构受力特性已逐渐成为隧道动态施工和稳定性评价最常用的方法之一;在总结隧道受力分析发展历程的基础上,通过对近20年来39座隧道71个监测断面围岩压力的统计分析,研究隧道围岩压力的总体分布特征及其与隧道岩性、施工方法、隧道埋深、隧道跨度等因素的关系,讨论隧道支护结构的受力规律及围岩压力的时空分布特征;总体而言,围岩压力值分布范围大致为15~600 kPa;围岩压力随隧道埋深增大而增大,埋深越大,围岩压力分布越离散;且围岩压力沿洞周呈拱肩→拱腰→拱顶→拱脚→仰拱逐渐减小的分布规律;围岩压力有明显的时间效应,一般在隧道开挖后40天左右趋于稳定。研究结论可作为完善隧道结构支护方法及分析围岩压力作用机制的参考。It has gradually become one of the most common methods for dynamic construction and safety evaluation to analyze the stress characteristics of tunnel structures through in-site monitoring results.Basis on summarizing the history of tunnel stress analysis,the relationship between the overall distribution characteristics of surrounding rock pressure and some factors including the lithology,the construction method,the buried depth and the span of the tunnel,was studied by analyzing the statistics of the surrounding pressure of 71 monitoring sections from39 tunnels in the recent 20 years.And the stress conditions of the supporting structure and the temporal and spatial distribution characteristics of the surrounding rock pressure were discussed.In general,the value of surrounding rock pressure is about between 15 k Pa to 600 k Pa.The surrounding rock pressure increases with the burial depth of the tunnel,and the greater the burial depth,the more discrete the surrounding rock pressure distribution.The surrounding rock pressure decreases along the circumference of tunnel with the line of the shoulder→the side wall→the vault→the arch→the inverted arch.At the same time,the surrounding rock pressure shows obvious time effect.Generally,the surrounding rock pressure tends to be stable about 40 days after the excavation.The above conclusions can be a reference for improving the supporting method and the analyzing the mechanism of surrounding rock pressure.

关 键 词：隧道围岩压力 现场监测 时程曲线 空间分布 

分 类 号：U456.2[建筑科学—桥梁与隧道工程]