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目前,对渡槽抗震性能的研究多集中在槽身与水体的流固耦合问题上,对桩土间的动力相互作用则研究较少,然而桩土相互作用会影响渡槽结构对动荷载尤其是地震荷载的反应。为探究桩土相互作用对渡槽结构动力特性的影响,采用大型有限元软件ABAQUS对南水北调中线工程双洎河渡槽建立了同时考虑流固耦合和桩土相互作用的桩—土—渡槽—水三维仿真力学模型,并进行了不同工况下的自振频率及振动模态分析。结果表明,与固结模型相比,考虑桩土相互作用的渡槽结构在地震荷载作用下自振频率减小,桩土相互作用改变了渡槽结构动力特性。
At present, the research on the seismic performance of aqueducts mainly focuses on the fluid-structure interaction between the body and the water body. However, the interaction between the pile and the soil is less studied. However, the interaction between the pile-soil and the aqueduct may affect the dynamic response of the aqueduct to dynamic loads, Load reaction. In order to investigate the effect of pile-soil interaction on the dynamic characteristics of aqueduct structures, a three-dimensional simulation of pile-soil-aqueduct-aqueduct considering both fluid-structure interaction and pile-soil interaction was established by using the large-scale finite element software ABAQUS for Shuangbahe Aqueduct in the midline of the South-to-North Water Diversion Project Mechanical model, and under different conditions of natural frequency and vibration mode analysis. The results show that compared with the consolidation model, the natural frequency of aqueduct considering the pile-soil interaction decreases under the seismic load, and the interaction between pile and soil changes the dynamic characteristics of the aqueduct.