隧道浅埋段的地表沉降变形规律研究

Study on the Law of Surface Settlement and Deformation in Shallow Buried Section of Tunnel

为了分析隧道浅埋段的地表沉降变形规律,文中以某高速公路隧道为例,对隧道浅埋段的地表纵向及横向沉降量以及沉降量变化速率曲线进行研究。结果表明,随着掌子面距断面距离的增加,A1监测点位置的地表沉降量基本维持在67 mm, A3、A5、A7监测点位置的地表累计沉降量表现为先快速下降后缓慢下降的变化规律。所有监测断面的地表沉降量分布曲线表现为凸谷的形状,越靠近隧道中心轴线位置,沉降量越大;距离洞口越远,地表沉降量越小。沉降速率值以隧道轴线对称,越靠近隧道轴线的沉降量变化速率越低;随着开挖的推进,且距离洞口越近,沉降量变化速率不断减小。

In order to analyze the deformation law of the shallow buried section of the tunnel,the longitudinal and transverse settlement of the surface of a highway tunnel and the settlement change rate curve of the shallow buried section of the tunnel are studied in this paper.The re-sults show that with the increase of the distance from the section,the surface settlement at A1 is basically maintained at 67 mm;the cumulative surface settlement in A3,A5 and A7 shows the change pattern of rapid decline and then slow decline.The surface settlement distribution curve of all the monitoring sections shows the shape of the convex valley,and the closer to the central axis of the tunnel,the greater the settlement a-mount.The farther away from the hole,the smaller the surface settlement is.The closer to the axis of the tunnel,the lower the rate of the change of the tunnel;the closer to the tunnel,the rate decreases.