桩承式低填路堤土拱效应的数值模拟

发布时间：2018-04-13 06:00

本文选题：路基工程 + 低填路堤　；参考：《深圳大学学报(理工版)》2014年05期

【摘要】：利用数值模拟试验研究低填路堤下土拱效应的特性.通过建立三维土拱模型,研究影响土拱效应的主要参数——桩布置形式、桩间距、填土高度和扩大头直径间的相互关系.结果表明,无论是三角形还是正方形布置形式,钉形桩的应力分布具有显著的空间对称性;在布置形式、填土高度和桩间距等参数一定的条件下,随着钉形桩扩大头直径的增加,土拱效应发挥程度降低,当扩大头较大,相邻两桩桩边缘较近时,群桩的挤土作用较明显;在正方形桩体布置形式下,填土路堤中应力分布较均匀,挤土作用下的土拱形态对称性比三角形布置形态要好,但桩土应力比却并不一定比三角形的大.在设计中需要综合考虑填土高度、扩大头直径以及桩的布置形式等因素.
[Abstract]:The characteristics of soil arch effect under low fill embankment are studied by numerical simulation test.Through the establishment of a three-dimensional soil arch model, the relationships between the main parameters affecting the soil arch effect, such as pile layout, pile spacing, fill height and enlarged head diameter, are studied.The results show that the stress distribution of the nailed pile has significant spatial symmetry regardless of the triangular or square layout, and under certain conditions, such as layout form, filling height and pile spacing, etc.With the increase of the diameter of the expanded head of the nail pile, the soil arch effect is reduced. When the enlarged head is larger and the adjacent two piles are close to the edge, the compaction of the pile group is more obvious, and when the square pile body is arranged,The stress distribution in embankment is more uniform, and the symmetry of soil arch is better than that of triangular arrangement, but the pile-soil stress ratio is not always larger than that of triangle.Such factors as filling height, expanding head diameter and pile layout should be taken into account in the design.
【作者单位】：湖北科技学院资源环境科学与工程学院;武汉大学土木建筑工程学院;
【基金】：湖北省自然科学基金资助项目(2012FFC01401)~~
【分类号】：U416.12

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