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针对地震载荷作用下锚喷支护隧道安全性问题.基于软岩流变特性,通过三维有限差分软件FLAC3D建立隧道模型,研究了不同支护刚度条件下围岩变形和支护体应力情况.数值分析表明:二衬厚度为30c m、40 cm、50 cm、60 cm时,拱顶围岩变形分别为-23.63 cm、-19.37 cm、-16.77 cm、-15.59 cm;支护体应力振幅最大值分别为9.4%、15.1%、26.8%、42.1%;说明随支护刚度增大,支护体应力急剧增加,因此应将围岩变形控制和抗震设计有机结合考虑;上述研究为锚喷支护隧道抗震设计提供了参考.
In view of the rheological characteristics of soft rock, the tunnel model is established by FLAC3D finite element software, and the deformation of surrounding rock and the stress of supporting body under different supporting stiffness are studied. The analysis shows that the deformation of the surrounding rock of the arch lining is -23.63 cm, -19.37 cm, -16.77 cm and -15.59 cm respectively when the thickness of the second lining is 30 cm, 40 cm, 50 cm and 60 cm. The maximum stress amplitudes Respectively, which is 9.4%, 15.1%, 26.8% and 42.1% respectively. It shows that with the increase of support stiffness, the stress of support body increases sharply. Therefore, the deformation control and seismic design of surrounding rock should be considered organically. Tunnel seismic design provides a reference.