台阶式短加筋土挡墙行为特征的离心模型试验

发布时间：2018-05-01 21:17

本文选题：土工合成材料 + 短加筋土挡墙　；参考：《西南交通大学学报》2016年06期

【摘要】：短加筋土挡墙是一种在既有稳定墙体/陡坡前修建的窄加筋土挡墙,目前对其工作机理的研究尚不深入,特别是对短加筋土挡墙内部存在陡坎及增设台阶的情况鲜有研究.本文利用离心模型试验,结合系统的监测数据,对各组模型试验墙顶沉降、墙面水平位移、土压力分布等规律进行了分析,探讨了短加筋土挡墙的行为特征以及中部增设台阶的影响.研究发现:短加筋土挡墙的竖向沉降和水平位移均较常规加筋土挡墙分布偏不均匀;短加筋土挡墙与其后稳定墙体/陡坡接触区域竖向土压力分布存在明显应力集中和应力消散区;中部增设台阶可很好地控制短加筋土挡墙变形,提高整体稳定性;短加筋土挡墙和其后稳定墙体/陡坡之间的压力监测值远小于理论水平土压力值,二者间仅为接触压力.
[Abstract]:The short reinforced earth retaining wall is a kind of narrow reinforced earth retaining wall built in front of the existing stable wall / steep slope. At present, the working mechanism of the short reinforced earth retaining wall has not been thoroughly studied, especially in the case of the existence of steep ridges and the addition of steps in the short reinforced earth retaining wall. In this paper, by using centrifugal model test and monitoring data of the system, the law of wall top settlement, horizontal displacement of wall surface and distribution of earth pressure in each group of model tests are analyzed. The behavior characteristics of short reinforced earth retaining wall and the influence of adding steps in the middle are discussed. It is found that the vertical settlement and horizontal displacement of the short reinforced earth retaining wall are more uneven than those of the conventional reinforced earth retaining wall. The vertical earth pressure distribution in the contact area between the short reinforced earth retaining wall and the subsequent stable wall / steep slope is obvious stress concentration and stress dissipation area, the deformation of the short reinforced earth retaining wall can be well controlled and the overall stability can be improved by adding steps in the middle part of the retaining wall. The pressure monitoring value between the short reinforced earth retaining wall and the subsequent stable wall / steep slope is much smaller than the theoretical horizontal earth pressure, and the contact pressure between the two is only the contact pressure.
【作者单位】：同济大学地下建筑与工程系;上海申元岩土工程有限公司;同济大学岩土工程与地下结构教育部重点实验室;上海建工七建集团有限公司;
【基金】：湖北省交通科学研究资助项目(2011-700-3-42)
【分类号】：U417.11

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