基于流固耦合动力模型的饱和土体-隧道体系地震反应研究

基于流固耦合动力模型的饱和土体-隧道体系地震反应研究摘要：本文基于流固耦合动力学模型，研究了饱和土体-隧道体系在地震作用下的动态响应特性。首先，建立了饱和土体的孔隙水流动方程和固相应力平衡方程，考虑了

- 基于流固耦合动力模型的饱和土体隧道体系地震反 应研究 摘要： - 本文基于流固耦合动力学模型，研究了饱和土体隧道体系在地震作 用下的动态响应特性。首先，建立了饱和土体的孔隙水流动方程和固相 应力平衡方程，考虑了饱和土体的剪切变形和孔隙变形，进而采用无限 元法建立了饱和土体的流固耦合动力学模型。其次，建立了隧道体系的 机械模型，包括了隧道本体和围岩，采用有限元法对隧道进行建模和分 析。最后，通过数值计算研究了饱和土体和隧道体系的地震反应特性， 分析了饱和土体的孔隙水压力变化、隧道内部应力和位移的变化等。研 究结果表明，在地震作用下，饱和土体孔隙水压力的变化对隧道体系的 响应影响很大，应合理设计排水系统，降低地震灾害风险。 关键词：流固耦合动力模型；饱和土体；隧道体系；地震反应；无 限元法；有限元法 Abstract: Based on the fluid-solid coupling dynamic model, this paper studies the dynamic response characteristics of saturated soil-tunnel system under earthquake action. Firstly, the pore water flow equation and solid stress balance equation of saturated soil are established, and the shear deformation and pore deformation of saturated soil are considered. Then, the infinite element method is used to establish the fluid-solid coupling dynamic model of saturated soil. Secondly, amechanical model of the tunnel system is established, including the tunnel body and surrounding rock, and the finite element method is used to analyze the tunnel. Finally, through numerical calculations, the seismic response characteristics of the saturated soil and tunnel system are studied, and the changes in pore water pressure of saturated soil, internal stress and displacement of the tunnel are analyzed. The results show that under earthquake action, the change of pore water pressure of saturated soil has agreat impact on the response of the tunnel system. It is necessary to design areasonable drainage system to reduce the risk of earthquake disasters.