摘要
通过利用大型单轴固结仪对砂质板岩粗粒土填料进行低应力状态(σ=50,100,200,400和800 kPa)的单轴压缩蠕变试验,研究砂质板岩粗粒土路堤填料的蠕变性质。基于粗粒土蠕变理论,分析填料的蠕变曲线特征,确定蠕变的初始计算时间,选取常见的蠕变本构模型,利用改进的高斯-牛顿法确定压实度为95%的砂质板岩粗粒土的蠕变模型参数。研究结果表明:砂质板岩粗粒土在低应力状态下表现出具有弹性变形、稳定蠕变和无黏性流动的衰减蠕变特性;H-K-K模型更准确地反映砂质板岩粗粒土填料的蠕变特性。
By using the large uniaxial consolidometer, the compression creep test under low confining stress conditions （including 50,100,200,400 and 800 kPa） was conducted to investigate the creep behavior of the embankment of sandy slate coarse - grained soil fillings. Based on the creep theory of coarse - grained soil, the characteristic of the creep curve was analyzed to determine the initial calculation time of creep, and the common creep constitutive models were selected to obtain the model parameters of sandy slate coarse - grained soil with 95% relative compactness through modified Gauss -Newton method. The results show that the sandy slate coarse - grained soil presents a degenerative creep property of elastic deformation, stable creep and non viscous flow and H - K - K model is more precise in describing the creep behavior of sandy slate coarse - grained soil fillings
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第3期33-36,共4页
Journal of Railway Science and Engineering
基金
铁道部科技研究开发计划项目(2010G018-B-3-2)
关键词
高速铁路
粗粒土
蠕变
参数识别
high - speed railway
coarse grained soil
creep
parametric recognition
