摘要
以某黄土公路隧道为背景,通过室内常规三轴试验来获取原状Q2黄土的物理力学参数,并基于数值分析方法探讨因地表水分入渗或地下水位抬升引起的洞周围岩压力的变化规律,并提出考虑含水率影响的修正围岩压力算法。结果表明:(1)随着地表水入渗深度或地下水位抬升高度的增大,围岩压力呈增大趋势,且最大围岩压力比ψmax=1.1~3.5,最大收敛变形比ζmax=1.1~1.3;(2)初始含水率越低,其最大围岩压力比和收敛变形比越大,因地表水分入渗或水位抬升引起的围压放大效应越明显;(3)隧道埋深越浅,围岩压力分布越不均匀,"猫耳朵"形状越明显,埋深越大围岩压力分布相对均匀;(4)引入围岩压力比,提出了半数值半经验的修正隧道围岩压力计算公式,可考虑因黄土地层含水率增大引起的围岩压力放大效应。
Based on a highway tunnel in loess,the triaxial tests under different moisture contents of undisturbed Q2 loess are conducted to obtain the physical and mechanical parameters,and the numerical method is used to analyze the variation laws of surrounding earth pressure(SEP)under the infiltration of surface water or rising of underground water level.The modified methods for SEP are put forward by considering the effects of moisture content.The results show that:(1)With the increase of rising height of underground water level and the infiltration depth,the SEP exhibits a trend of increase,and the largest SEP ratioψmax=1.1~3.5,the largest surrounding earth convergence deformation ratioζmax=1.1~1.3.(2)The lower the initial moisture content of the loess stratum,the greater the maximum SEP ratio and convergence deformation ratio,and the more obvious the SEP amplification effect caused by water infiltration or rising of water level.(3)The shallower the buried depth of tunnel is,the more uneven the SEP distribution is,the more obvious the shape of“cat’s ear”is,and the more evenly the SEP distribution is.(4)By introducing the SEP ratio,a semi-numerical and semi-empirical formula for calculating the SEP of the tunnel is put forward,and the amplification effect of SEP caused by the increase of moisture content of loess can be considered.
作者
朱才辉
贺豪楠
兰开江
李玉波
ZHU Cai-hui;HE Hao-nan;LAN Kai-jiang;LI Yu-bo(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an 710048,China;China Railway First Survey and Design Institute Group.Co.,Ltd.,Xi'an 710043,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第S01期93-98,共6页
Chinese Journal of Geotechnical Engineering
基金
西安理工大学省部共建西北旱区生态水利国家重点试验室项目(2019KJCXTD-12)
国家自然科学基金项目(51678484)
陕西省自然科学基金项目(2019JLP-22)
关键词
黄土地层
隧道
围岩压力
含水率
分布模式
loess stratum
tunnel
surrounding earth pressure
moisture content
distribution mode
作者简介
朱才辉(1983—),男,陕西商南人,博士,2012年博士毕业于西安理工大学岩土工程专业,现任副教授,主要从事黄土力学与工程等方面的教学与研究工作。E-mail:zhucaihui123@163.com。
