The burgeoning demand for land resources in cities has spurred the development of intricate underground infrastructure networks. Therefore, evaluating the performance and stability of entire existing underground complexes in the event of construction-related disturbances becomes increasingly crucial for ensuring overall urban resilience. This paper adopts a coupled modeling technique of the Finite Element Method (FEM) and Smoothed Particle Hydrodynamics (SPH) for the analysis of catastrophic failure mechanisms in underground complexes, with a focus on disturbances due to nearby tunneling. Two-dimensional centrifuge model experiments were used to thoroughly calibrate the coupled FEM-SPH method, validating its accuracy and suitability for the simulation of soil–structure interaction problems. Subsequently, a full-scale integrated model of the underground complex and formation in a given area was established, including the subway network and highway system. Taking into account the longitudinal connections of the tunnel segments, the catastrophic coupling mechanisms related to construction disturbances in deep tunneling were investigated. The results indicate that collapsed soil caused by deep construction disturbances spreads through the gaps between the tunnels towards the ground, acting as a force-transmitting medium to correlate the deformations of the different structures. The response of the structures was evaluated using five different patterns of deformation, including tunnel settlement, dislocation, opening, rotation, and ovalization. In addition, the evolution of the performance of the underground complex during construction disturbances was analyzed using three types of indicators. Finally, the assessment of the catastrophic failure degree and the identification of vulnerable areas within the complex were carried out.

中文翻译：

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深部施工扰动下地下综合体灾难性破坏机制


城市对土地资源不断增长的需求刺激了复杂的地下基础设施网络的发展。因此，评估整个现有地下综合体在发生与施工相关的干扰时的性能和稳定性对于确保城市的整体恢复力变得越来越重要。本文采用有限元法（FEM）和平滑粒子流体动力学（SPH）的耦合建模技术来分析地下综合体的灾难性破坏机制，重点关注附近隧道开挖造成的干扰。采用二维离心机模型实验对耦合FEM-SPH方法进行了彻底的校准，验证了其模拟土-结构相互作用问题的准确性和适用性。随后，建立了给定区域的地下综合体和地层的全尺寸集成模型，包括地铁网络和高速公路系统。考虑隧道管片的纵向连接，研究了与深部隧道施工扰动相关的灾难性耦合机制。结果表明，深层施工扰动引起的塌陷土体通过隧道之间的间隙向地面扩散，充当力传递介质，使不同结构的变形相关联。使用五种不同的变形模式评估结构的响应，包括隧道沉降、错位、开口、旋转和椭圆化。此外，还使用三类指标分析了施工扰动期间地下综合体性能的演变。 最后，对综合体内的灾难性破坏程度进行了评估并识别了脆弱区域。