地铁联络通道冻结暗挖施工三维数值模拟

Three-dimensional Numerical Simulation of Freezing and Subsurface Excavation Construction for Metro Connecting Passage

建立包括双线盾构隧道、冻土帷幕、联络通道以及泵房在内的三维数值模型,模拟了地层冻结、联络通道开挖和支护的整个过程。分析了联络通道以及泵房开挖对冻土帷幕、初支护和主隧道的影响。从而,确定了初支护及冻土帷幕的受力最不利位置和发生最大变形的位置,并提出相应的控制指标。

Three-dimensional numerical models for double-line shield tunnel,curtain of frozen soil,connecting passage and pump house are established.The whole process of ground freezing as well as excavation and support for connecting passage is simulated.The effects of excavation of connecting passage and pump house on frozen soil curtain,primary support and main tunnel are analyzed to determine the position of worst stress direction for primary support and frozen soil curtain and the position of maximum distortion. Then,the corresponding control index is present.