大断面浅埋隧道下穿公路地表沉降分析

Analysis on Surface Settlement of Large-section Shallow-buried Tunnel Undercrossing Highway

文章通过对隧道施工过程中的地表沉降进行监测,探究了大断面暗挖隧道的地表沉降特征。结果显示,大断面浅埋隧道采用交叉中隔墙(CRD)法施工时,地表沉降现象较为明显。在不同导洞的开挖过程中,地表沉降特征各不相同,后续开挖右上导洞时,地表沉降变形及沉降速率均为施工过程中最大值。此外,相较于地表,道路路面的沉降量有所减小,沉降槽宽度增加。因此,施工过程中需采取切实有效的控制和监测措施,减少地表沉降变形。

The characteristics of surface settlement of large-section undercutting tunnel are explored by monitoring the surface settlement in the process of tunnel construction.The results show that the surface settlement is obvious when the large-section shallow-buried tunnel is constructed by Cross Diaphragm(CRD)method.In the excavation process of different pilot tunnels,the characteristics of surface settlement are different.When the right upper pilot tunnel is excavated,the surface settlement deformation and settlement rate are both the maximum values during the construction process.In addition,compared with the surface,the settlement of the road surface is reduced and the width of the settlement groove is increased.Therefore,effective control and monitoring measures should be taken in the construction process to reduce the surface settlement deformation.