摘要
为了分析土工袋挡墙的地震动力响应特征,研制一个叠层剪切模型箱,借此开展土工袋挡墙大型振动台模型试验。结果表明:土工袋挡墙作为一种新型的柔性挡土墙型式,在地震过程中依靠自身变形耗散了大量能量,加速度放大系数随墙高的升高而增大,而随输入地震动峰值加速度的增大而有减小的趋势;土工袋挡墙与墙后填土具有相近的基频与类似的频谱特征,墙体与填土变形基本协调,整个结构的基频随着输入地震动峰值加速度的增大与经受的振动次数增加逐渐减小;土工袋挡墙墙-土间峰值动土压力随着输入地震动峰值加速度的增大呈增大趋势,沿墙高分布近似为“S”型(或称为“双峰型”);经受多次振动后土工袋挡墙的累计残余水平位移较小,在0.6g的输入地震动作用下,最大累计位移仅为墙高的0.29%,表明土工袋挡墙具有良好的抗震性能。
A shaking table model test was conducted in a designed laminar shear box to study the seismic dynamic response of a retaining wall of soilbags. The results show that the retaining wall of soilbags dissipated a lot of vibration energy during the earthquake due to its relative flexibility. The acceleration amplification coefficient increases with the wall height,and decreases with the increasing input vibration amplitudes. The natural frequency and the spectral characteristics of the soilbags' retaining wall are similar to those of the backfill soil,so that the retaining wall can deform basically together with the backfill soil. The natural frequency of the retaining wall model decreases with the increasing input vibration amplitudes and the increasing vibration number. The peak dynamic earth pressure between the retaining wall and the backfill soil increases with the increasing input vibration amplitudes,and it approximately takes an“S-shape”distribution(or called double peaks) along the wall height. The cumulative lateral residual displacement of the retaining wall model of soilbags is small when subjected to multiple vibrations. The maximum ratio of the cumulative displacement to the wall height is about 0.29% at the input earthquake acceleration of 0.6 g,indicating the good seismic behavior of the retaining wall of soilbags.
作者
刘斯宏
贾凡
陈笑林
王建磊
梁妍
LIU Sihong;JIA Fan;CHEN Xiaolin;WANG Jianlei;LIANG Yan(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;China Design Group Co.,Ltd.,Nanjing,Jiangsu 210014,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第A02期4338-4347,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51379066)
中央高校基本科研业务费专项资金资助(2018B624X14)
江苏省研究生科研与实践创新计划项目(KYCX18_0593)~~
关键词
土力学
土工袋挡墙
地震荷载
动力特性
振动台试验
抗震性能
soil mechanics
retaining wall of soilbags
seismic load
dynamic characteristics
shaking table test
seismic behavior
