摘要
以华丽高速公路东马场1号隧道工程为依托,依据数值模拟结果及现场监测变形数据比较不同台阶长度对洞周位移、初支应力的影响。结果表明:围岩变形均随中台阶长度的增长而增大,当中台阶到一定长度时,变形增加速度变缓。隧道初支应力均随中台阶长度的增长而减小,当中台阶到一定长度时应力减小速度变缓。加长中台阶长度有利于围岩应力释放,支护结构受力得到减小,虽然围岩变形有所增大,但增大幅度不大。
In relation to Dongmachang No.1 Tunnel engineering of the Huaping-Lijinag Expressway, the effects of different step lengths on the tunnel circum-tunnel displacement and initial support stress caused by tunnel excavation were compared according to the numerical simulation results and field monitoring deformation data. The results show that the deformation of the surrounding rock increases with the increase of the length of the middle step, and the rate of deformation increases slowly when the length of the middle step increases to a certain extent. When the length of the middle step increases to a certain extent, the decrease rate of the stress decreases slowly. The lengthening of the middle step length is beneficial to the release of the surrounding rock stress, and the stress of the supporting structure is reduced. Although the deformation of surrounding rock increases, the increase is not large.
作者
赵书涛
谢金池
谭芝文
杨文波
寇昊
杨利明
ZHAO Shutao;XIE Jinchi;TAN Zhiwen;YANG Wenbo;KOU Hao;YANG Liming(China Construction Infrastructure Co.,Ltd.,Beijing 100044,China;Southwest Jiaotong University,Chengdu 610031,China;China Construction Tunnel Co.,Ltd.,Chongqing 401320,China)
出处
《路基工程》
2022年第5期186-191,共6页
Subgrade Engineering
基金
中建股份科技研发计划资助项目(CSCEC-2021-Z-26)。
关键词
高地应力软岩大变形
隧道工程
围岩变形
围岩受力
数值模拟
large deformation of soft rock with high in-situ stress
tunnel engineering
deformation of surrounding rock
stress of surrounding rock
numerical simulation
