双线隧道矿山法施工引起地表沉降及建筑物变形规律研究

Research on Surface Settlement and Deformation of Buildings Caused by Double Line Tunnel Mining Method Construction

以福州某分离式双线矿山法隧道施工为背景,利用数值模拟建立隧道下穿建筑物模型,研究施工过程中地表沉降特征,及隧道以不同角度穿越建筑物施工后建筑物的扭曲变形。研究结果表明:在监测断面处地,表沉降有较大增幅;建筑物影响范围内的地表沉降值,比无建筑物时相同隧道埋深工况下的地表沉降值大而陡;建筑物与隧道开挖轴线夹角为30°时的最大地表沉降值,明显大于其它角度的沉降值;建筑物与隧道开挖轴线夹角越大,建筑物扭曲变形越大,对建筑物造成破坏也越大。

Taking the construction of a separated double-line mine tunnel in Fuzhou as the background,a tunnel underpass building model is established by numerical simulation to study the surface settlement characteristics during construction and the distortion of the building after the tunnel passes through the building at different angles.The results show that the surface settlement increases greatly at the monitoring section;The surface settlement value in the influence area of the building is larger and steeper than that under the same tunnel depth condition without the building.When the Angle between the building and the tunnel excavation axis is 30°,the maximum surface settlement value is obviously larger than that at other angles.The greater the Angle between the building and the tunnel excavation axis,the greater the distortion of the building and the greater the damage to the building.