摘要
以西南某浅埋隧道下穿施工便道工程为依托,采用数值模拟软件对分步开挖引起围岩体的应力应变进行分析,对支护形式进行优化设计。在车辆振动荷载效应理论的基础上,利用FLAC3D有限差分软件的非线性动力分析功能,考虑车辆振动荷载对隧道下穿过程的影响。研究结果表明:上台阶开挖后,拱顶沉降量过大,需进行超前支护;车辆振动荷载可使岩土体沉降量增加3mm,其力学响应随深度呈现规律变化;由于偏压作用,地表沉降曲线呈左右不对称分布。
Based on the project of a shallow buried tunnel under wear sidewalk construction in the Southwest, using the numerical simulation software for step-by-step excavation of the surrounding rock, the stress and strain are analyzed, and optimize the design of the support form. Based on the theory of vehicle vibration load effect, the nonlinear dynamic analysis function of FLAC3D finite difference software is used to analyze the influence of vehicle vibration load on the tunnel under the influence of the load. The results show that： after the excavation, the vault settlement amount is too large, it is necessary to carry out the advanced support; vehicle vibration load can increase the amount of rock and soil about 3 mm,and its mechanical response varies with depth; Because of biased, left-right asymmetry of surface subsidence curve was distributed.
出处
《水科学与工程技术》
2017年第5期61-65,共5页
Water Sciences and Engineering Technology
关键词
隧道下穿
施工便道
振动荷载
非线性动力分析
沉降规律
tunnel under-crossing
the service road
vibration load
nonlinear dynamic analysis
settlement regularity
