桩承式路堤中的静动力土拱效应

发布时间：2018-01-18 10:25

本文关键词：桩承式路堤中的静动力土拱效应　出处：《建筑科学与工程学报》2017年05期 　论文类型：期刊论文

【摘要】：为了从更深层次理解土拱效应的工作性状,在总结桩承式路堤土拱效应中等沉面、桩体荷载分担比等问题的基础上,比较了几种桩体荷载分担比的计算方法,阐述了动荷载在桩承式路堤中的传递机理,分析了土拱效应发挥程度对动应力的影响,最后给出桩承式路堤中动应力的计算方法。研究结果表明:等沉面与土拱高度可用临界填土高度进行归一化描述,临界填土高度与桩间净距呈线性关系;桩体荷载分担比的大小与工况有关,几种计算方法有各自的适用条件;陈云敏的计算方法与实测值拟合度较高;动荷载的传递也受土拱效应的影响,随着动荷载循环次数的增加,土拱效应存在先强化后弱化的现象。
[Abstract]:In order to understand the working characteristics of soil arch effect from a deeper level, several calculation methods of pile load sharing ratio are compared on the basis of summing up the middle settlement surface of soil arch effect of pile-supported embankment and the load-sharing ratio of pile body. The transfer mechanism of dynamic load in pile-supported embankment is expounded, and the influence of soil arch effect on dynamic stress is analyzed. Finally, the calculation method of dynamic stress in pile-supported embankment is given. The results show that the equal-settlement surface and the height of soil arch can be normalized by the critical fill height, and the critical fill height has a linear relationship with the net distance between piles. The load sharing ratio of pile is related to the working condition, and several calculation methods have their own applicable conditions. Chen Yunmin's calculation method has high fitting degree with the measured value. The transfer of dynamic load is also affected by the soil arch effect. With the increase of dynamic load cycles, the soil arch effect is strengthened first and then weakened.
【作者单位】：湖南大学建筑安全与节能教育部重点实验室;湖南大学土木工程学院;浙江省交通规划设计研究院;
【基金】：国家自然科学基金项目(41472244) 国家重点研发计划资助(2016YFC0800207)
【分类号】：U416.12
【正文快照】： 0引言中国沿海、沿湖、沿江地区广泛分布深厚软土。软土地基高速公路、高速铁路的沉降控制标准非常严格,规范[1-2]中要求:高速公路和一级公路的一般地段工后沉降应小于等于30cm;设计时速为250km·h-1和300~350km·h-1的有砟轨道路基一般地段工后沉降应分别小于等于10cm和5cm;

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