仰拱滞后距离对大断面浅埋隧道稳定性影响分析

Influence of Invert Lag Distance on Stability of Large Section Shallow Buried Tunnel

仰拱的及时施作可以有效地控制浅埋大断面隧道变形。以格鲁吉亚E60(F3)第二标段3005#高速公路隧道为工程背景,选取仰拱滞后距离分别为10m、20m、30m、35m四种工况,探究仰拱滞后距离对隧道围岩、仰拱和喷射混凝土的影响。结果表明:仰拱滞后距离控制在20~30m时,对隧道围岩、仰拱和喷射混凝土稳定性更有利。

The timely construction of inverted arch can effectively control the deformation of shallow-buried large-section tunnel.Taking the 3005#expressway tunnel in the second section of E60(F3)in Georgia as the engineering background,four working conditions,namely,the inverted arch lag distance of 10m,20m,30m and 35m,are selected to explore the impact of the inverted arch lag distance on the tunnel surrounding rock,inverted arch and shotcrete.The results show that the lag distance of the inverted arch should be controlled at 20~30m,which is more beneficial to the stability of tunnel surrounding rock,inverted arch and shotcrete.