高速铁路牛河梁车站基坑开挖变形数值模拟研究

Numerical Simulation Study on Excavation Deformation of High-speed Railway Niuheliang Station Foundation Pit

基坑的开挖及支护过程始终是工程项目施工中的重点及难点问题.为了更好地探究其在京沈高铁牛河梁车站施工中的应用,阐述基坑开挖在不同开挖深度和支护措施条件下的变形特征,结合数值模拟技术对施工效果进行了评价.在该过程中,首先基于项目特点及工程地质条件等的综合分析,然后分析了不同开挖深度下的变形特征,最后依次分析了基坑在地连墙支护、内支撑支护及锚杆支护下的变形规律分析.研究表明:随着基坑一次开挖的深度越大,底部隆起位移也越大;本工程基坑开挖项目中,内支撑支护措施对防止基坑变形的效果最佳,其次为地连墙支护措施,锚杆支护措施相对最为不佳.

The excavation and supporting process of foundation pit is always the key and difficult problem in engineeringproject construction. In order to better explore its application in rail transit construction, the deformation characteristics of foundation pit excavation under different excavation depth and support measures are described, and the construction effect is evaluated by numerical simulation technology. In this process, based on thecomprehensive analysis of project characteristics and engineering geological conditions, the deformation characteristicsunder different excavation depths are analyzed, and finally, the deformation law of the foundation pit under theground wall support, internal support and anchor support is analyzed successively. The results show that the displacementof the bottom uplift increases with the increase of the primary excavation depth. In the foundation pitexcavation project of this project, the internal support measures have the best effect on preventing the deformation of the foundation pit, followed by the ground wall support measures, and the bolt support measures are relativelythe worst.