基于叠层剪切吸能控制的山岭隧道抗震机理研究

隧道工程抗震设计在保障交通工程全寿命周期内安全、高效运营中起到关键的作用，近年来大量隧道震害问题证实了隧道工程抗减震技术亟需深入探讨的必要性。本项目借助室内试验、理论分析和数值模拟的综合技术手段，开展基于叠层剪切吸能控制的山岭隧道抗震机理研究。首先，通过伺服控制剪切试验机开展叠层剪切吸能结构动载压-剪试验，阐明叠层剪切吸能结构的动载剪切变形破坏机制；其次，利用弹性波动理论构建叠层剪切吸能结构-隧道衬砌协同动力学理论模型，基于因素分析法筛选出减震效果判据量化表征减震性能，阐明叠层剪切吸能结构的变形-吸能减震机理；最后，结合某典型隧道工程振动台模型试验，基于有限差分原理开展基于叠层剪切吸能控制的隧道衬砌-围岩数值模拟研究，阐明叠层剪切吸能结构-隧道衬砌-围岩之间的变形协调机制，揭示基于叠层剪切吸能控制的山岭隧道抗震机理，为叠层剪切吸能结构相关减震技术在隧道工程中应用奠定理论基础。

The seismic design of tunnel engineering plays a key role in ensuring the safe and efficient operation of traffic engineering in the life cycle. Many tunnel seismic damages in recent years have confirmed that the aseismic technology of tunnel engineering needs to be further studied. Study on aseismic mechanism of laminated shear energy dissipation supported-mountain tunnel will be conducted employing laboratory test, theoretical analysis, and numerical simulation. Firstly, laboratory dynamic pressure-shear tests for the laminated shear energy dissipation (LSED) structure will be carried out using the automated servo-controlled direct shear apparatus. The shear deformation and failure mechanism of the LSED structure under dynamic load will be clarified. Secondly, a corresponding seismic theoretical model of tunnel lining with the LSED structure will be developed using the elastic wave theory. Its performance index of seismic reduction will be determined using factor analysis approach to quantify its seismic reduction effect. The deformation-energy dissipation mechanism of the LSED structure will be expounded. Finally, numerical simulation of mountain tunnels equipped with LSED structure will be conducted based on the finite difference method (FDM) combined with the shaking table model test for one typical tunnel engineering. The deformation compatibility of LSED structure, tunnel lining, and surrounding rock will be clarified systematically. The seismic mechanism of mountain tunnels by LSED will be revealed. The present study will lay a theoretical foundation for the application of aseismic technology such as LSED structure in tunnel engineering.