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首页> 外文期刊>Tunnelling and underground space technology >Excavation and kinematic analysis of a shallow large-span tunnel in an up- soft/low-hard rock stratum
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Excavation and kinematic analysis of a shallow large-span tunnel in an up- soft/low-hard rock stratum

机译：软硬低硬岩层浅埋大跨隧道开挖及运动学分析

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The excavation of a shallow large-span metro tunnel in an up-soft/low-hard rock stratum restricted by a rock mass requires knowledge of the stratum kinematic mechanism to adopt an appropriate construction method to control the surface settlement and ensure structural safety. The purpose of a kinematic analysis is to predict the state of stratum collapse based on the nonlinear Hoek-Brown failure criterion and the upper bound theorem. The rock mass deformation and the supporting structural mechanics characteristics of the tunnel under different excavation methods are studied using numerical simulations. The Xinggongjie Station tunnel on the No. 1 Line of the Dalian Metro is used as an example. Furthermore, the ground surface settlement, the internal displacement of the surrounding rock mass and the stress on the supporting structure are monitored during the construction period. The accuracy of the theoretical kinematic model and the rationality of the selected excavation method are verified by comparing the theoretical results with the field monitoring results. The study shows that the slip failure surface and ground settlement curve can be accurately determined using the kinematic model. Different excavation sequences result in differences in the surface subsidence, and the most favourable sequence for restricting the subsidence is to excavate the arch-side pilot first and the middle pilot last. The rock mass deformation and the surface subsidence are acceptable according to field monitoring under this excavation sequence. The load ratios of the surrounding rock mass borne by the initial support, which is the primary bearing structure of the tunnel, at different monitoring points are greater than 80%. The proportion of the secondary lining is approximately 20%, which is the safe reserve of the tunnel. The tunnel has been demonstrated to be safe; it has been placed into service and has operated well.
机译：在受岩体限制的软硬/低硬岩层中开挖浅埋大跨度地铁隧道需要了解层运动学机理，以采用适当的施工方法来控制地表沉降并确保结构安全。运动学分析的目的是基于非线性Hoek-Brown破坏准则和上限定理来预测地层塌陷的状态。利用数值模拟研究了不同开挖方法下隧道的岩体变形及支护结构力学特性。以大连地铁一号线新工街站隧道为例。此外，在施工期间还监测地表沉降，围岩内部位移和支撑结构上的应力。通过将理论结果与现场监测结果进行比较，验证了理论运动学模型的准确性和所选挖掘方法的合理性。研究表明，利用运动学模型可以准确地确定滑动破坏面和地面沉降曲线。不同的开挖顺序导致地面沉降的差异，限制沉降的最有利顺序是先开拱侧先导，最后开中导。根据该开挖顺序的现场监测，岩体变形和地表沉陷是可以接受的。在不同的监测点，由初始支座（即隧道的主要支护结构）承受的围岩的荷载比大于80％。二次衬砌的比例约为20％，这是隧道的安全储备。隧道已被证明是安全的。它已经投入使用并且运行良好。

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