摘要
以武汉地铁2号线第23标段广埠屯站至虎泉站区间施工竖井为例,应用基于三维快速拉格朗日元法的计算软件FLAC3D建立竖井的三维模型,对竖井开挖与支护进行了模拟,计算中采用摩尔-库仑弹塑性模型,通过数值模拟及实测数据对比分析了竖井开挖导致的地面沉降规律、竖井周围岩体的水平位移特征、锚杆内力的分布特征及塑性区分布特征,从竖井的各种数据的分布规律推出了竖井的潜在滑动面,本竖井的潜在滑动面为上凹下凸的曲面,且从井口到井底滑动面位置逐渐向井壁靠近,其计算结果安全可靠,分析结果可为工程设计及施工提供参考。
Taken Wuhan Metro shaft construction as an example, the three-dimensional model of shaft is based on the three-dimensional Fast Lagrangian element method. A simulation is carried out to the shaft excavation and support. The calculation used of Moore-Coulomb elastic-plastic model, is compared with the numerical simulation and measured data. The paper then analyzes the characteristics of surface subsidence and the horizontal displacement of rock mass around the shaft which was caused by shaft excavation and support. Furthermore, the distribution of internal force of rock bolt and plastic zone is also discussed. From the vertical distribution of the shaft data obtained from the shaft potential sliding surface, the obtained results are safe and reliable. The results of the analysis provide a reference for engineering design and construction.
出处
《工程勘察》
CSCD
北大核心
2010年第3期26-31,共6页
Geotechnical Investigation & Surveying
关键词
竖井
数值模拟
地表沉降
位移监测
支护
shaft
FLAC3D
surface subsidence
displacement monitoring
support
