【摘要】 介绍了沉管隧道的传统抗震分析方法,针对上海某沉管越江隧道的非线性地震响应问题,提出了基于显式有限元和高性能计算上的大规模数值模拟仿真方法。建立了包括地基土、沉管隧道以及柔性接头在内的全三维分析模型,单元数和节点数均超过百万。充分考虑到土壤、橡胶等多个对象的材料非线性,以及土体-沉管间、柔性接头-管段间的接触非线性因素,最后利用动态显示算法及其关键技术进行了基于高性能计算机的大规模地震响应分析。计算结果描述了地基土-沉管隧道体系在地震荷载作用下的相互作用和整体变形,同时对沉管及柔性接头等关键部位进行了深入分析,从而为沉管隧道的抗震设计研究提供参考。更多还原

【Abstract】 Based on traditional anti-earthquake analysis methods for immersed tunnel and forcusing on certain immersed tunnel in Shanghai a three-dimensional analytical model is constructed that consists of foundation soil immersed tunnel and detailed flexible joints. With the total numbers of either nodes or elements exceeding 1 million respectively the model takes account of nonlinear behaviors of materials including both soil and rubber. Also nonlinear behaviors of contact interface between soil and immersed tunnel and those between flexible joints and tunnel segments are considered. Using explicit algorithm final calculation is completed on a high-performance computer. Simulation results reveal the dynamic behavior and distortion of the immersed tunnel-foundation soil system under seismic loading. The key parts including immersed segments and flexible joints are deeply investigated. to provide references for aseismic design and analysis of immersed tunnel.更多还原