桩承式加筋路堤三维土拱效应试验研究
发布时间：2019-05-15 20:43
【摘要】：桩承式加筋路堤受力性状比较复杂,土拱效应对路堤的承载变形性状具有重要影响。通过三维土拱效应模型试验,研究桩-土相对位移、路堤高度、桩帽净间距和水平加筋体拉伸强度等因素对桩土应力比及路堤沉降的影响。结果表明:土拱效应发挥程度与桩-土相对位移密切相关,存在一个临界桩-土相对位移使得桩土应力比达到最大值,该临界桩-土相对位移约为6~8 mm。路堤高度与桩帽净间距之比越大,桩土应力比越大,路堤顶面差异沉降越小;桩帽宽度与桩帽净间距之比越大,桩土应力比越大,路堤顶面差异沉降越小。设置水平加筋体能有效提高桩土应力比并减小路堤顶面沉降;路堤越低,水平加筋体对桩土应力比的提高作用及对路面沉降的减小作用越明显;水平加筋体拉伸强度越高,这种作用越明显。桩承式加筋路堤三维土拱效应等沉面高度与桩帽净间距之比约为3.5。
[Abstract]:The stress behavior of pile-supported reinforced embankment is complex, and the soil arch effect has an important influence on the bearing deformation behavior of embankment. The effects of pile-soil relative displacement, embankment height, net spacing of pile cap and tensile strength of horizontal reinforced body on pile-soil stress ratio and embankment settlement are studied by three-dimensional soil arch effect model test. The results show that the soil arch effect is closely related to the pile-soil relative displacement. There is a critical pile-soil relative displacement that makes the pile-soil stress ratio reach the maximum, and the critical pile-soil relative displacement is about 6 鈮，
本文编号：2477743
[Abstract]:The stress behavior of pile-supported reinforced embankment is complex, and the soil arch effect has an important influence on the bearing deformation behavior of embankment. The effects of pile-soil relative displacement, embankment height, net spacing of pile cap and tensile strength of horizontal reinforced body on pile-soil stress ratio and embankment settlement are studied by three-dimensional soil arch effect model test. The results show that the soil arch effect is closely related to the pile-soil relative displacement. There is a critical pile-soil relative displacement that makes the pile-soil stress ratio reach the maximum, and the critical pile-soil relative displacement is about 6 鈮，
本文编号：2477743
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