Underground utility tunnels are the most fundamental and reliable lifeline network in urban cities, and are widely constructed throughout the world. In urban areas, most utility tunnels usually encounter the non-homogeneity of subsoil condition due to various construction effects. Studies have shown that the damage mechanism of shallow underground structures mainly depends on the inhomogeneity of the subsoil conditions. This would become a considerable factor for the stability of the underground utility tunnel structures. However, this type of research still needs to establish the vulnerable seismic design. In this study, a series of shaking table tests were conducted on non-homogenous soils to investigate the performance of seismic interaction between utility tunnels, surrounding soils and interior pipelines. The dynamic responses measured from the test account for the boundary condition of non-homogeneous soils, the internal forces, displacement of tunnel joints, the dynamic characteristics on interior pipelines and the reasonable spring stiffness with damping in the seismically isolated gas pipeline model inside the tunnel. The vulnerability of underground utility tunnel in non-homogeneous soil zone and the mechanism of the stability of interior facilities are the main topics discussed in this paper.

地下公用设施隧道是城市中最基本，最可靠的生命线网络，并且在世界范围内广泛建设。在城市地区，由于各种施工效果，大多数公用工程隧道通常会遇到地下土条件不均匀的情况。研究表明，浅层地下结构的破坏机理主要取决于底土条件的不均匀性。这将成为影响地下公用隧道结构稳定性的重要因素。但是，这类研究仍需要建立脆弱的抗震设计。在这项研究中，在非均质土壤上进行了一系列振动台试验，以研究公用事业隧道，周围土壤和内部管道之间的地震相互作用性能。测试得出的动力响应考虑了非均匀土的边界条件，内力，隧道缝的位移，内部管道的动力特性以及隧道内部隔震天然气管道模型中具有阻尼的合理弹簧刚度。非均质土壤区地下公用工程隧道的易损性和室内设施的稳定机制是本文讨论的主要主题。