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1基本假设在计算围岩压力之前,先对隧道相关方面作一些假设:(1)假设隧道设计断面轮廓线为圆弧形拱;(2)假设隧道拱脚约束为固定端;(3)隧道围岩压力呈径向均匀分布。隧道断面的轮廓线如图1,VA、VB为支座竖向反力,HA、HB为支座水平反力,MA、MB为支座反力矩。θ(0<θ<π)为隧道拱部结构所对应的圆心角的一半。
1 Basic assumptions Before calculating the surrounding rock pressure, we make some assumptions about the tunnel related aspects: (1) Assuming that the outline of the tunnel design section is an arc-shaped arch; (2) Assuming that the tunnel arch is constrained as a fixed end; (3) Surrounding rock pressure radial distribution. The outline of the tunnel section is shown in Figure 1, VA and VB are the vertical reaction force of the support, HA and HB are the horizontal reaction force of the support, and MA and MB are the reaction torque of the support. θ (0 <θ <π) is the half of the central angle corresponding to the tunnel arch structure.