长江科学院院报2017，Vol.34Issue(2)：63-68,6.DOI:10.11988/ckyyb.20161069
土工织物散体桩复合地基路堤土拱效应研究
Soil Arching of Geotextile-encased Granular Columns Composite Foundation under Embankment Load
摘要
Abstract
In the aim of investigating the soil arching of geotextile-encased stone columns,we established a three-di-mensional finite element model of geotextile-encased granular columns composite foundation under embankment load to analyze the influences of geotextile stiffness,column spacing and embankment height.Results indicated that the ratio of geotextile modulus to soil modulus which induced the start of soil arching was 20.The modulus ratio had little effect on soil arching after reaching 67.The height of soil arching increased linearly until the height of em-bankment reached 5 times of net spacing and then remained constant.The required height for a complete soil arc-hing increased with the increase of net spacing.When net spacing reached twice the pile diameter,the height of soil arch remained stable.Moreover,with the increase of embankment height,the soil arch rate decreased gradually. When the height of embankment reached 1 .7 times of net spacing to form complete soil arch,the soil arching rate did not change anymore.Compared with numerical results,we found that the results calculated by the three-dimen-sional soil arching method proposed by Hewlett and Randolph are the closest to the numerical results,and we sug-gest to use this method for design.关键词
土工织物散体桩/复合地基/土拱高度/土拱率/数值分析Key words
geotextile-encased granular column/composite foundation/height of soil arching/soil arching rate/nu-merical analysis分类
建筑与水利引用本文复制引用
李良勇,陈建峰,徐超,郭鹏辉,陈宝成,杨晓楠..土工织物散体桩复合地基路堤土拱效应研究[J].长江科学院院报,2017,34(2):63-68,6.基金项目
国家自然科学基金项目（41572266）；云南省交通运输厅科技项目（云交科2015（A）12） （）
