【摘要】 该文针对双线地铁隧道中单侧隧道内爆炸引起的附近地面建筑物的动力响应及滑移隔震效应进行了数值模拟研究。采用八结点等参元和集中质量体系来分别模拟包含隧道的有限土区和地面多层建筑,并将其耦合形成整个相互作用体系模型。在基底摩擦力计算中提出修正连续摩擦力模型,以克服传统Coulomb摩擦力模型的内在缺陷。通过与单线隧道内爆炸引起建筑物响应及滑移隔震效应的算例对比分析,揭示出地表建筑物在遭受地下单侧隧道内爆炸产生的经相邻隧道反射及衍射后的冲击波作用所引起的动力响应特征及其基底滑移隔震效果,从而为相关的理论研究和工程实践提供重要的数据参考。更多还原

【Abstract】 This paper gives a numerical analysis for dynamic responses and sliding base-isolation of a building on the ground to an explosion inside one of two-way tunnels. The models of the finite tunnel-included soil zone and the aboveground multi-storey building are formed respectively by means of the eight-node isoparametric finite element technique and mass-lumped system method, and then coupled together to establish the whole interaction one. In the calculating of sliding friction on the base, a modified continuous friction model is proposed in order to overcome the inherent disadvantages of the traditional Coulomb friction model. In comparison with some data under the one-way tunnel condition, example results for responses of an aboveground building with or without a sliding base-isolated measure under blast waves, generated by an explosion inside one of the two-way tunnels and reflected or refracted around the adjacent tunnel, show some new characteristics and isolated effects, which can provide some important references for the related theoretical research and engineering practice.更多还原