Abstract The deeply-buried tunnels serve as an effective method for the sustainable management of stormwater to mitigate the waterlogging and sewer overflow problems of modern cities in rainy seasons. This paper presents a series of full-scale structural loading tests on the segmental lining of a large deeply-buried stormwater storage tunnel considering the operation conditions, in which the cycle of water inflow and drainage was repeated. The testing results show that water inflow has notable influences on the mechanical and structural behaviors of segmental lining. The bending moment increases slightly but the axial force decreases significantly with the increasing inner hydrostatic water head. The convergence deformation develops during water inflow and recovers in the process of drainage, following a parabola pattern. However, the deformation cannot be fully recovered after complete drainage, mostly due to the residual deformation of segmental joints. The structural responses of the segmental lining remain approximately constant subjected to a limited number of loading cycles. The effects of water inflow on the distribution of internal forces and deformation deviate from the elastic solutions for homogeneous ring subjected to isotropic inner pressure. The influences of bending moment and axial force on joint behavior are unified through eccentricity. Three distinct zones associated with the interaction condition between adjacent blocks at the joint are identified for the relationship between joint deformation and eccentricity, and also for the relationship between joint rotational stiffness and eccentricity. The observations made in the current study may shed light on the design and construction of similar projects in pilot cities committed for the Sponge City policy of China.

中文翻译：

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大型雨水储存隧道管片隧道衬砌的结构行为：全尺寸加载试验的洞察

摘要 深埋隧道是缓解现代城市雨季内涝和下水道溢流问题的雨水可持续管理的有效手段。本文介绍了考虑运行条件的大型深埋雨水储存隧道管片衬砌的一系列全尺寸结构加载试验，其中重复进排水循环。试验结果表明，进水对管片衬砌的力学性能和结构性能有显着影响。随着内部静水压头的增加，弯矩略有增加，但轴向力显着降低。收敛变形在进水过程中发展，在排水过程中恢复，呈抛物线状。然而，完全排水后变形不能完全恢复，主要是节段节理残余变形所致。在有限数量的加载循环下，管片衬砌的结构响应保持近似恒定。水流入对内力分布和变形的影响偏离了受各向同性内压作用的均质环的弹性解。弯矩和轴力对接头行为的影响通过偏心统一。三个不同的区域与接缝处相邻块体之间的相互作用条件相关联，用于确定接缝变形和偏心度之间的关系，以及接头旋转刚度和偏心度之间的关系。