摘要
软岩铁路隧道在运营阶段易发生持续的变形及底臌等其他影响工程安全的现象,而高地应力加剧了变形。为探究在不同高地应力作用下软岩隧道的变形和受力的规律,运用FLAC3D对软岩隧道的位移和安全系数进行分析。结果表明:竖向地应力不变,水平地应力越大隧道的水平位移越大,竖向位移越小,水平地应力的改变对双线隧道影响显著;水平地应力的改变对隧道安全系数的改变影响不明显。
Phenomenon impacting on engineering safety, on the soft rock railway tunnel during railway operation, such as deformation, floor heave, etc. , may happen and the deformation is aggravated by high ground stress. To understand the deformation and stress law of the soft rock tunnel under the action of different high ground stress, displacement and safety coefficient is analyzed for the soft rock tunnel by FLAC3D. The results show that without change of vertical crustal stress, the larger the horizontal crustal stress, the larger the horizontal displacement of the tunnel, the smaller the vertical displacement, and the change in the horizontal displacement has significant impact on the double-track tunnel, and small impact on the safety coefficient of the tunnel.
出处
《路基工程》
2017年第3期204-207,共4页
Subgrade Engineering
基金
川藏铁路修建关键技术研究(中国铁路总公司科技研究开发计划课题2014G004-A)
关键词
软岩隧道
高地应力
大变形
隧道位移
安全系数
soft rock tunnel
high ground stress
large deformation
tunnel displacement
safety coefficient
