双线平行盾构隧道侧穿邻近框架建筑物影响的研究

Study on Effect of Double-line Parallel Shield Tunneling Side-crossing on Adjacent Frame Structures

实际工程中双线平行盾构隧道大多沿建筑物侧面穿过。在双线盾构施工过程中势必会对地层产生扰动,对临近建筑物造成不利影响。考虑建筑物-土体-隧道的共同作用,采用MIDAS/GTS软件建立三维有限元模型,模拟双线平行盾构侧面穿越短桩基础框架结构建筑物的工况。研究结果表明:双线隧道中靠近建筑物一侧的盾构隧道后掘进,对建筑物的影响更大;随着隧道开挖面的穿越,建筑物横向沉降逐渐增大,纵向不均匀沉降先增大后减小,建筑物逐渐朝向隧道一侧整体倾斜;建筑物最大第一主应力P1先增大,完全穿越后逐渐减小并趋于稳定。

Double- line parallel shield tunnels mostly pass through on structures in the practical engineering. It will disturb the stratum and do harm to adjacent buildings. Considering the interaction of building-soil-tunnel, the short-pile frame building which side-crossed by double-line parallel shield tunneling is simulated by 3D MIDAS / GTS software. The results show that the shield tunnel near by the building passed later will do more impact on it. With the excavation of the tunnel through the building,the transverse settlement of the building increased and the longitudinal uneven settlement increases first and then decreases gradually. Therefore, the building tended towards to tunnel side. The maximum first principal stress P1 also increased first but it decreased gradually and approached to their initial value after totally tunneled.