首页 | 本学科首页   官方微博 | 高级检索  
     

重复荷载作用下砂土永久变形预估模型
引用本文:张洪亮, 郭忠印, 高启聚, 丛林. 重复荷载作用下砂土永久变形预估模型[J]. 交通运输工程学报, 2008, 8(3): 58-62.
作者姓名:张洪亮  郭忠印  高启聚  丛林
作者单位:1.同济大学 道路与交通工程教育部重点实验室, 上海 200092;;2.长安大学 特殊地区公路工程教育部重点实验室, 陕西 西安 710064
基金项目:国家自然科学基金 , 国家西部交通建设科技项目 , 中国博士后科学基金
摘    要:为预估路基的永久变形, 在万能材料试验机上对砂土进行了重复加载动三轴试验, 得到了砂土永久变形的发展曲线, 建立了塑性应变和荷载作用次数之间的关系式, 使用最小二乘法拟合出该式中的系数与含水量和回弹模量之间的回归公式, 并对回归公式进行了可靠性分析。当荷载作用次数为10000次时, 现有路基土永久变形模型预估结果与试验结果相对误差最小为52%, 最大高达376%;而系数与含水量和回弹模量之间的回归公式相关系数最小值为0.31, 平均值为0.41, 大于临界值0.28, 试验曲线与理论曲线相关系数大于0.99。分析结果表明: 建立的砂土永久变形预估公式可靠性较高, 而现有预估模型不适用于砂土。

关 键 词:路基工程   砂土   永久变形   重复加载试验   预估模型
收稿时间:2008-01-27

Permanent deformation prediction model of sandy soil under repeated load
Zhang Hong-liang, Guo Zhong-yin, Gao Qi-ju, Cong Lin. Permanent deformation prediction model of sandy soil under repeated load[J]. Journal of Traffic and Transportation Engineering, 2008, 8(3): 58-62.
Authors:Zhang Hong-liang  Guo Zhong-yin  Gao Qi-ju  Cong Lin
Affiliation:1. Key Laboratory for Road and Traffic Engineering of Ministry of Education, Shanghai 200092, China;;2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
Abstract:In order to predict the permanent deformation of subgrade, a dynamic triaxial test of sandy soil under repeated load was made by using universal testing machine(UTM), the development curves of the deformation were got, the relationship formula between plastic strain and load acting time was found, the regression formulas among the coefficients of the relationship formula, water content and resilient modulus were fitted by using least square method, and their reliability was analyzed. Analysis result shows that when load acting time reaches 10 000, the minimum and maximum relative errors between permanent deformation prediction result and measured result are 52% and 376% respectively; the minimum and average correlative coefficients of the regression formulas are 0.31 and 0.41 respectively, which are greater than the critical value of 0.28, and the correlative coefficient between theoretical curve and measured one is more than 0.99. So the reliability of the proposed prediction formulas of permanent deformation for sandy soil is higher, but existing prediction model is not suitable for sandy soil. 2 tabs, 4 figs, 16 refs.
Keywords:subgrade engineering  sandy soil  permanent deformation  repeated load test  prediction model
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《交通运输工程学报》浏览原始摘要信息
点击此处可从《交通运输工程学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号