大粒径级配碎石的永久变形研究及模型预测
Study and Model Prediction of Permanent Deformation of Large-size Graded Aggregates
伍阳 1程春 2谭波 2粟友良 2李杰敏2
作者信息
- 1. 广西交通技师学院交通工程系,南宁 530001
- 2. 桂林理工大学土木工程学院,桂林 541004;广西绿色建材与建筑工业化重点实验室,桂林 541004
- 折叠
摘要
为了研究大粒径级配碎石在循环重复荷载作用下的永久变形规律,对大粒径级配碎石混合料开展循环压实试验,研究含水量、级配、重复荷载对大粒径级配碎石累积变形的影响,引入灰色关联理论,通过计算各因素的灰色关联度,确定各因素对永久变形的影响程度.试验结果表明:当荷载低于200 kPa时,大粒径级配碎石混合料处于塑性安定状态,当荷载在250～300 kPa时,试样变形将缓慢累积,试样处于塑性蠕变状态;根据灰色关联分析结果,大粒径级配碎石混合料的永久变形受级配的影响最大,其次是压实荷载和含水量;最后基于试验结果,提出了一种更适用于大粒径级配碎石的累积变形预测模型.
Abstract
In order to study the permanent deformation of large-size graded aggregates under cyclic repeated loads,cy-clic compaction tests were carried out on large-size graded aggregates to investigate the effects of moisture content,grada-tion and repeated loads on the cumulative deformation of large-size graded aggregates,and grey correlation theory was in-troduced to calculate the grey correlation degree of the factors to determine the degree of influence of each factor on the permanent deformation.The test results show that:when the load is lower than 200 kPa,the large-grained graded gravel mix is in the state of plastic stability,and when the load is 250～300 kPa,the deformation of the specimen will be accumu-lated slowly,and the specimen is in the state of plastic creep;according to the results of grey correlation analysis,the per-manent deformation of large-grained graded gravel mix is most affected by the gradation,followed by the compaction load and water content;Finally,based on the experimental results,a more applicable cumulative deformation prediction model for large-size graded crushed stone is proposed.
关键词
大粒径级配碎石/永久变形/灰色关联分析/模型预测/路基路面Key words
large-size graded crushed stone/permanent deformation/grey correlation analysis/model predic-tion/road base pavement引用本文复制引用
出版年
2024
NETL
NSTL
万方数据