摘要
为研究圆形隧道背后空洞对结构抗震性能的影响,开展振动台模型试验研究。从地层参数、试验模型相似比、模型箱设计、人工边界处理、传感器布置及地震动加载制度等方面,详细介绍模型试验方案。分析模型箱的边界处理效果,重点考察了模型地基的加速度反应、隧道结构的加速度反应、隧道结构的动应变规律及特征。试验结果表明:模型箱设计合理,边界的设置能够很好地模拟原型土域;随着地震波的向上传播,模型地基中的峰值加速度逐渐增大,地表处的加速度放大系数随着台面输入地震动的增大而减小;在较小地震动作用下,圆形衬砌背后空洞会缩小断面的加速度响应,而在较大地震动作用时会明显增大断面地震反应。
In order to study the effect of void behind circular tunnel on seismic performance,a large-scale shaking table model test was carried out. The paper introduced the model test including the parameters of soils,the decision of model similarity ratio,the design of model box,the treatment of boundary,the arrangement of sensors and the loading scheme of seismic waves and so on. The effect of boundary was analyzed. The test focused on the rule and character of the acceleration responses of model site and tunnel and the dynamic strain responses of tunnel. The rational design of model box and the treatment of boundary could effectively simulate the prototype soil layers. With seismic wave upward propagating,the peak acceleration of model soil was increasing. Amplified factors of acceleration at test points on ground surface decreased with the increase of shaking table load. With the void behind lining,the seismic response will would be reduced under the effect of small earthquakes and would be amplified under major earthquakes.
出处
《工业建筑》
CSCD
北大核心
2017年第3期117-123,146,共8页
Industrial Construction
基金
国家自然科学基金项目(61503201)
