基于侧向地基回填隔震层的两层三跨地铁地下车站结构抗震性能分析  

Seismic performance of the two-layer three-span subway underground station structure with lateral foundation backfill isolation layer

作　　者：朱雪立 王伟 庄海洋[1] ZHU Xueli;WANG Wei;ZHUANG Haiyang(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009

出　　处：《地震工程与工程振动》2021年第3期165-175,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51978333)。

摘　　要：针对两层三跨地铁地下车站结构侧向采用不同含量橡胶颗粒土作为回填隔震层,建立土-地连墙-隔震层-主体结构静动力耦合非线性动力相互作用的二维整体有限元分析模型,分析设置不同含量的橡胶颗粒土侧向隔震层对地下车站主体结构的侧向变形、结构可恢复性以及地震损伤等结构地震反应的影响规律。结果表明:设置10%~20%含量的橡胶颗粒土隔震层可有效地减轻地震对车站结构的地震损伤程度,提高车站结构的震后可恢复性与抗震性能。然而,当输入峰值加速度大于0.2 g时,隔震层的设置会增大地下结构的侧向变形。总体上,建议基岩输入峰值加速度PBA≦0.2 g时,可采用10%~20%含量的橡胶颗粒土作为隔震层来提升地下车站结构的整体抗震性能。Rubber sand mixture with different content is used as lateral foundation backfill isolation layer on the subway station structure, a two-dimensional finite element model for the static-dynamic coupling nonlinear interaction among the soil, the diaphragm wall, isolation layer and underground subway station structure was established, analyzing the rubber sand mixture isolation layer with different content on the seismic response of the two-layer three-span subway station structure, such as the lateral deformation, structure recoverability, and earthquake damage. It showed that the 10% ~ 20% RSM isolation layer can effectively reduce the damage of station structure, improve the recoverability and seismic performance of station structure. However, when the input peak acceleration is greater than 0.2 g, set isolation layer will aggravate the lateral deformation. In general, it is recommended that 10% ~ 20% RSM can be used as isolation layer to improve the overall seismic performance of the subway underground station structure under the input peak acceleration of bedrock PBA≦0.2 g.

关 键 词：地铁地下车站结构 橡胶颗粒土隔震层 可恢复性 减震效能 数值模拟 

分 类 号：P315.9[天文地球—地震学]