厦门市仙岳山隧道围岩稳定性三维有限元计算分析

3-D FEM ANALYSES ON STABILITY OF XIANYUESHAN TUNNEL OF XIAMEN CITY

厦门市仙岳山隧道为一城市双洞四车道隧道，其岩柱净距１９ｍ，仅是规范要求值下限的 ５７％。为了探讨不同围岩及线间距条件对该隧道稳定性的影响，使用三维弹塑性有限元方法进行了系列的计算分析，取得了有益的认识。

Xianyueshan tunnels is a double-hole urban tunnel with four lanes. The width of rock column between tunnels is 19 m, which is only 57% of the lower limit of requirement values in the standard. In order to investigate the influence of different surrounding rockmasses and rock pillar interval on the stability of tunnel, a series of calculations and analyses are carried out by using a 3-D elasto-plastic FEM code, and useful knowledge is obtained.