摘要
为了研究中国西南地区泥质页岩地层修建隧道时所存在的围岩大变形、初期支护偏压破坏等现象,依托中老铁路玉溪至磨憨段曼木树隧道为工程背景,通过现场监测和数值模拟相结合的方法对泥质页岩偏压段的围岩变形、围岩压力和钢拱架应力进行研究,探讨支护结构的受力特征。研究结果表明:上台阶开挖后的变形占总变形量的80%,最大变形位置为左侧拱腰处;围岩压力和钢拱架应力呈现明显的"上大下小"和"左大右小"的空间分布特点,围岩压力最大值为386.4 kPa,钢拱架应力最大值为174.2 MPa;模拟结果与实测结果变化趋势接近,具有明显的偏压特征,左侧拱腰位置偏于危险。研究成果可为泥质页岩地层下隧道的设计和施工提供参考。
In order to study the phenomena such as large deformation of surrounding rocks and initial support unsymmetrically loading failure during the construction of argillaceous shale tunnels in southwestern China,taking the Manmushu tunnel in the Yuxi to Mohan section of the China-Laos Railway as the engineering background,the method combining field monitoring and numerical simulation was used to study the deformation of surrounding rock,the pressure of surrounding rock and the stress of steel arch frame in the biased section of argillaceous shale,and to discuss the mechanical characteristics of the supporting structure.The research results show that the deformation after excavation of the upper bench accounts for 80%of the total deformation,and the maximum deformation position is at the left hance;the surrounding rock pressure and the stress of the steel arch frame show obvious"large upper and small lower"and"large left and small right"spatial distribution characteristics,the maximum pressure of the surrounding rock is 386.4 kPa,and the maximum stress of the steel arch frame is 174.2 MPa;the simulation results and the measured results demonstrate a similar trend,with obvious bias characteristics,and the left hance position is probably dangerous.The research results can provide a reference for the design and construction of tunnels under argillaceous shale formations.
作者
郭亚斌
李德武
赵斐
张俊
GUO Ya-bin;LI De-wu;ZHAO Fei;ZHANG Jun(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;No.3 Engineering Company Ltd of CCCC First Harbor Engineering Company Ltd.,Dalian 116083,China)
出处
《科学技术与工程》
北大核心
2021年第2期774-780,共7页
Science Technology and Engineering
关键词
偏压隧道
泥质页岩
现场监测
受力特征
unsymmetrically loaded tunnel
argillaceous shale
in-situ monitoring
mechanics characteristic
