摘要
结合天坛东门站的工程条件,运用FLAC软件对车站主体浅埋暗挖的四种施工和支护方案进行模拟研究。得出车站周围土体应力、塑性区和位移的基本变化规律,并确定最优开挖方案。研究结果表明:(1)车站开挖过程中,地表破坏区基本从车站两侧垂线向外扩散至与垂线呈45°,车站两帮的破坏区较大,管棚及底拱对抑制车站顶部和底部的破坏有非常明显的效果;(2)单纯的竖向或分层开挖对地表沉降均有不利的影响,2种开挖方式的适度结合能达到较好的效果;(3)偏弧中支撑较中直支撑更能有效抑制地表位移的沉降,半竖直半对称开挖法方案为最优方案;(4)实测结果进一步验证车站开挖支护设计能满足车站的整体稳定性要求。
Four construction-support methods of shallow excavation are simulated with FLAC2D combined with engineering situation of Tiantan east station. Regularities of stress, plastic region, and displacement in surrounding soil are studied and the optimal excavation method is put forward. The main results are as follows. （1） in excavation, plastic region of ground surface spreads from vertical lines of both sides of the station to the line at an angle of 45 ~ with the vertical lines. Plastic region at both sides of the station is very large. The plastic region at top and bottom of the station is greatly restrained by canopy-shelter and bottom arch; （2） adverse effect is made by single vertical or horizontal excavation to ground surface subsidence, and better effect can be achieved by a combined method of the two excavations~ （3） the partial arc support is better than vertical support in restraining subsidence of ground surface. The combined method of vertical and symmetrical excavation is optimal; and （4） that excavation-support design can meet the whole stability of the station is further proved by the in-situ measured result.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A02期5773-5778,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
数值分析
浅埋暗挖
开挖顺序
中洞中隔壁法
FLAC软件
numerical analysis
shallow-embedding deep excavation
excavation order
middle-hole central dissepimental（CD） method
FLAC software
