三维非线性有限元分析在地下管棚支护中的应用

The 3-Demension FEM Analysis on Pipe Shed Support Technology in Underground Structure Engineering

结合某地下隧道管棚支护设计及施工方案,采用三维非线性有限元对该洞库的开挖与支护过程进行了模拟,得出的结论是:管棚支护对于控制地表沉降、侧墙水平位移和塑性变形作用明显;不同管径和管间距对位移最大值影响有限,但对管钢内应力有较大影响;不同开挖进尺、不同注浆加固厚度对围岩变形及支护结构的影响较大。该数值分析结果与以往现场实测结果相一致,可作为相关工程设计和现场施工的理论指导。

Based on an actual construction project, a tunnel construction procedure with pipe shed support is simulated with three-dimension nonlinear FEM. The conclusion is： the pipe shed support have very tangible influence on controlling ground settlement, horizontal displacement of the side wall and plastic deformation. The influence of pipe diameters and spaces is limited on the displacement maximum, but has greater effect on the pipe internal stress. The influence of excavation lengths and the thickness of grout strengthening on tunnel structure are more obvious. The actual monitoring results demonstrated that the numerical simulation results are reliable and can be used as design and construction reference for pipe shed support engineering.