摘要
将橡胶砂填入经过高强焊接的土工网状格室形成加筋橡胶砂,通过大尺寸循环单剪试验研究加筋橡胶砂在4种竖向应力、5种位移幅值下的滞回曲线、动剪模量比和阻尼比随循环次数的变化规律。结果表明:60次循环单剪中,循环次数对低配比、低竖向应力橡胶砂的影响比较明显,随着循环次数的增加材料吸收能量的能力减小,减震效能逐渐下降,塑性变形能力下降;循环次数对小剪切加筋橡胶砂动剪模量有增加效应,对大剪切应变的有略微减小效应;当竖向应力较小时,循环次数对动剪模量影响不稳定,呈现波动性;当竖向应力较小时,阻尼比曲线达到稳定时需要的循环次数较少,当竖向应力较大时,阻尼比曲线达到稳定时需要的循环次数较多。
Reinforced rubber sand can be used to fill into the geotextile chamber with high strength welding. Large size cyclic shear tests have been conducted, thus working out the hysteretic curves, dynamic shear modulus curves and damping ratio curves of GCRSM under four vertical consolidation pressure and flve different horizontal strain amplitude. Test results show that：In the 60 cycle single shears, there is an evident influence of cycle times on the rubber sand with a low ratio and low vertical consolidation pressure. With the increase of the cycle numbers, the ability of energy absorption and the efflciency of shock absorption of GCRSM is decreasing and the ability of plastic deformation is decreasing. The cycle numbers have an increasing effect on the shear modulus of small shear reinforced rubber sand and have a slightly decreasing effect on the large shear strain. When the vertical stress is relatively small, the effect of the cycle numbers on the dynamic shear modulus is unstable with a fluctuation. When the vertical consolidation pressure is relatively small, the number of cycles is smaller with a stable damping ratio curve. When the vertical consolidation pressure is large, the number of cycles is larger with a stable damping ratio curve.
作者
刘方成
张云飞
陈璐
LIU Fangcheng;ZHANG Yunfei;CHEN Lu(College of Civil Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《湖南工业大学学报》
2018年第3期23-29,共7页
Journal of Hunan University of Technology
基金
国家自然科学基金资助项目(51108177)
关键词
循环次数
橡胶砂
土工格室加筋
动剪模量
阻尼比
cycle number
rubber sand mixture
geo-cell reinforced
dynamic shear modulus
damping ratio
