论文部分内容阅读
基于鲁宾涅特软弱围岩隧道大变形发生机理,对隧道围岩位移进行了弹塑性解析分析,结合建兴高速公路四家子隧道数值模拟,对小净距隧道互相扰动围岩变形特征进行了分析。结果表明,双线隧道开挖扰动引起隧道内帮水平位移减小,外帮水平位移增加,且内帮减小量大于外帮增加量,而拱顶与仰拱竖向位移均有所增加;不同侧压力系数情况下的围岩挤出变形不同,得出侧压力系数与挤出变形近似为线性关系;探讨了双线隧道互相扰动所引起围岩变形的特征,这对小净距隧道的动态设计与施工具有参考价值。
Based on the mechanism of large deformation of the surrounding rock in the weak rock mass of Rubin Nei, the displacement of the surrounding rock of the tunnel is elastically and elastically analyzed. Combined with the numerical simulation of the Sijiazi tunnel on the Jianxing Expressway, Analysis. The results show that the horizontal displacement of the inner tunnel is reduced and the horizontal displacement of the outer tunnel is increased due to the disturbances of the two - lane tunnel excavation. The reduction of the inner diameter is larger than that of the outer lane, while the vertical displacements of the dome and the inverted arch increase. The results show that the lateral pressure coefficient is approximately linear with the extrusion deformation. The deformation of the surrounding rock due to the mutual disturbance of the two-lane tunnel is discussed. Dynamic design and construction of a reference value.