【摘要】 结合深圳地铁大—科区间隧道开挖与失水工程实例,根据有效应力分析方法,建立弹塑性渗流 应力耦合分析理论模型。采用VOF(VolumeofFluid)方法来跟踪非稳定渗流场的动态自由水面。开发相应的数值模拟分析程序,对实际隧道工程的动态开挖过程和失水过程进行仿真模拟,对失水过程中的不稳定渗流场进行详细分析,得出动态变化的地表沉降曲线。结果表明,计算值与现场测量值能够较好地吻合。更多还原

【Abstract】 Considering the case of Shenzhen metro Dajuyuan-Kexuanguan section tunnel excavation and the loss of water, in accordance with the effective stress analysis, sets up a flexible and plastic seepage flow-stress (coupling) analysis model. Uses VOF to trace the dynamic free water level of the unstable seepage field. Develops the corresponding numerical simulation analysis program. Emulates the process of dynamic excavation and the process of losing water in real tunneling work. Analyzes in detail the unstable seeping flow field in the process of losing water. And obtains the dynamic ground surface subsidence curve. It concludes that the calculation agrees with the field measurement.更多还原