隧道浅埋段地表沉降变形规律分析

Analysis on the law of surface settlement and deformation in shallow buried section of tunnel

为研究隧道浅埋段地表沉降变形规律,在施工现场布置测点开展监测。监测断面地表沉降影响范围为前后1.5 D(洞跨),前后距监测断面7 m左右沉降量和沉降速率增幅较大。监测断面横向中部测点沉降量大,两侧较小,最大沉降量出现在隧道中心线右侧,且随覆盖层厚度增加稳定性不断提高。

In order to study the law of surface settlement and deformation in the shallow buried section of the tunnel,measuring points were arranged at the construction site for monitoring.The influence range of the surface subsidence of the monitoring section is 1.5 D(tunnel span)before and after,and the subsidence amount and the subsidence rate of about 7 m away from the monitoring section increase greatly.The settlement of the measuring point in the lateral middle of the monitoring section is large,and the two sides are smaller.The maximum settlement occurs on the right side of the tunnel centerline,and the stability increases with the increase of the thickness of the covering layer.