Chen Zhiqiang, Xiang Wenlong, Hu Zhaojian, Li Mingjin, Wang Jintao, Hou Dongxiang, Huang Zhen
China State Construction Engineering Corporation Infrastructure Construction Investment CO. LTD., Wuhan, 430073, China.
China Construction Third Bureau Group CO. LTD., Wuhan, 430073, China.
Heliyon. 2024 Sep 11;10(18):e37667. doi: 10.1016/j.heliyon.2024.e37667. eCollection 2024 Sep 30.
There are a series of engineering risks, such as ground subsidence, building tilt and cracking, in the process of shield tunnel driving through buildings, which have many adverse effects on urban residents and engineers. In particular, the differences in the effects of the interaction of two-lane tunnels on the building structure and ground deformation field are less often considered under different spatial effects such as construction sequences and tunnel spacings. As well as the problem of analyzing the building as a whole out of reality. To solve these problems, the spatial effect of the shield tunnel underpassing the shallow foundation building is simulated by Plaxis3D software to study the sensitivity analysis of surface settlement and the internal forces and deformation law of the building above in the process of tunneling underpassing with different depths of burial and horizontal distance of the double line tunnel. The engineering impact zoning method can investigate the safety of tunnels and buildings under different spatial effects when tunnels pass through buildings. The splitting of the building into plates and columns can reveal the forces and deformation laws of different structural parts. The results show that during the construction process of the double-line tunnel, the tunnel constructed first has a "blocking effect" on the tunnel constructed later, which affects the distribution of the disturbance area to a certain extent and changes the curve shape of the settlement trough. When the "blocking effect" occurs, the surface settlement and building deformation will be significantly reduced. In the internal forces of the building, the plate structure is mainly subjected to changes in axial forces, while the column structure is mainly affected by shear forces and bending moments. The factor of safety of tunnels decreases as the tunnel spacing decreases and as the building loads above increase.
在盾构隧道穿越建筑物的过程中，存在一系列工程风险，如地面沉降、建筑物倾斜和开裂等，这些对城市居民和工程师都有诸多不利影响。特别是在不同施工顺序和隧道间距等空间效应下，双车道隧道相互作用对建筑结构和地面变形场的影响差异较少被考虑。同时还存在脱离实际将建筑物作为一个整体进行分析的问题。为解决这些问题，利用Plaxis3D软件模拟盾构隧道下穿浅基础建筑物的空间效应，研究在双线隧道不同埋深和水平距离下穿过程中地表沉降的敏感性分析以及上方建筑物的内力和变形规律。工程影响分区方法可研究隧道穿越建筑物时在不同空间效应下隧道与建筑物的安全性。将建筑物拆分为板和柱可揭示不同结构部件的受力和变形规律。结果表明，在双线隧道施工过程中，先施工的隧道对后施工的隧道有“阻挡效应”，在一定程度上影响扰动区分布并改变沉降槽曲线形状。当“阻挡效应”出现时，地表沉降和建筑物变形将显著减小。在建筑物内力方面，板结构主要受轴力变化影响，而柱结构主要受剪力和弯矩影响。随着隧道间距减小以及上方建筑物荷载增加，隧道的安全系数降低。
