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隧道洞口通常处于浅埋、偏压、围岩破碎等复杂地质、地形条件,施工中容易发生仰坡坍塌、冒顶、衬砌结构变形开裂、难于安全进洞等情况.以厦蓉高速公路老寨隧道为例,针对浅埋、偏压及洞口段围岩破碎的情况,采用FLAC3D数值计算软件对洞口段隧道支护结构的应力、塑性区发生发展规律、变形等进行研究,得出了隧道洞口段开挖过程中应力分布规律、塑性区的分布及破坏特点、变形与隧道开挖的关系等.
Tunnel openings are usually in the shallow buried, biased, broken rock and other complex geological and terrain conditions, prone to slope collapse during construction, roof collapse, cracking of the lining structure is difficult to safely enter the cave and so on. As an example, according to the shallow buried and biased pressure and the fragmentation of the surrounding rock at the mouth section, the numerical simulation software FLAC3D is used to study the stress and deformation of the tunnel supporting structure in the tunnel section and the deformation and so on. The stress distribution during excavation, the distribution and destruction characteristics of plastic zone, the relationship between deformation and tunnel excavation and so on.