摘要
为更加准确地确定黄土隧道开挖过程中不同黄土类型的变形控制基准,以宝兰客运专线安定隧道等6座隧道中的47个拱顶沉降实测数据作为研究的样本,根据土层的形成年代及成分,将其分为Q2黏质黄土、Q2砂性黄土、Q3砂性黄土及Q4砂性黄土4类,通过研究得到其全位移的回归曲线。数据表明:1)在一定范围内的含水率对最终沉降值影响并不明显,而基底承载力、埋深这2个因素和最终沉降量关系极为密切;2)对4类黄土的最终沉降的预测值进行分类分析,得到黄土隧道初步的变形控制基准Q2黏质黄土为110 mm、Q2砂性黄土为170 mm、Q3砂性黄土为300 mm、Q4砂性黄土为300 mm的结论,再根据埋深和地基承载力进行修正,形成的控制基准在目前在建的银西铁路隧道中得到了较好的验证。
The monitoring data of 47 crown deformation points in 6 tunnels on Baoji-Lanzhou Passenger-dedicated Line are used as research samples;and the samples are divided into 4 types,i.e.Q2 clayey loess,Q2 sandy loess,Q3 sandy loess and Q4 sandy loess,according to the formation age and composition.The displacement regression curves are obtained.The data show that:(1)The influence of water content in a certain range on the final subsidence value is little,while those of the bearing capacity of foundation and the buried depth are great.(2)By analyzing the predicted final settlement of the 4 types of loess,the deformation control standards are 110 mm for Q2 clayey loess,170 mm for Q2 sandy loess,and 300 mm for Q3 and Q4 sandy loess,which is modified according to buried depth and bearing capacity of foundation;and the final standards are verified in Yinchuan-Xi′an Railway tunnels.
作者
冯冀蒙
曾思聪
刘爱武
张树发
张俊儒
FENG Jimeng;ZENG Sicong;LIU Aiwu;ZHAHG Shufa;ZHANG Junru(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;China Tiesiju Civil Engineering Group Co.,Ltd.,Hefei 230022,Anhui,China)
出处
《隧道建设（中英文）》
北大核心
2020年第1期50-57,共8页
Tunnel Construction
基金
国家自然科学基金资助项目(51378435,51508476)
关键词
黄土隧道
拱顶沉降
变形控制基准
地基承载力
埋深
loess tunnel
crown settlement
deformation control standards
bearing capacity of foundation
buried depth
作者简介
第一作者:冯冀蒙(1986-),男,2013年毕业于西南交通大学,桥梁与隧道工程专业,博士,讲师,主要从事隧道及地下结构全寿命期安全性研究工作。E-mail:fengjm@swjtu.edu.cn。∗通信作者:张俊儒,E-mail:jrzh@swjtu.edu.cn。
