带齿格栅加筋挡墙工作机理的数值模拟研究

发布时间：2019-05-17 14:45

【摘要】：采用数值模拟方法对带齿格栅加筋挡墙工作机理进行了研究,分析了其工作性态及其影响因素,提出了带齿格栅概化模型和极限拉拔力计算公式。研究表明:由于齿筋的存在,格栅水平位移较小,齿筋内侧尤为显著。有齿筋时,位移场梯度明显较大。位移场核心位于齿筋外侧25 cm左右,水平位移峰值约为3 cm。当齿筋离模型箱侧边界距离约3 m时,拉拔力达到峰值。当齿筋间距增大时,其作用长度将逐步开展,拉拔力随之增大。齿筋高度与拉拔力呈正相关,而厚度的改变影响极小。带齿格栅工作机理可大致由挤密阶段、绕流阶段和稳定阶段来加以描述。由概化模型求得的极限拉拔应力理论值与数值模拟结果相近,表明该模型具有一定合理性。
[Abstract]:In this paper, a numerical simulation method is used to study the working mechanism of the reinforced retaining wall with a toothed grid, and the working behavior and the influencing factors of the retaining wall are analyzed. The results show that the horizontal displacement of the grating is small due to the existence of the tooth bar, and the inner side of the tooth bar is especially significant. The gradient of the displacement field is obviously larger when the toothed bar is provided. The core of the displacement field is about 25 cm on the outer side of the tooth bar, and the horizontal displacement peak is about 3 cm. When the distance between the tooth bars and the side of the model box is about 3 m, the drawing force reaches the peak value. When the spacing of the tooth bars is increased, the working length will be gradually carried out, and the drawing force is increased accordingly. The height of the tooth bar is positively related to the drawing force, and the change of the thickness is very small. The mechanism of the grid work can be described by the compaction phase, the flow-around stage and the stabilization stage. The theoretical value of the limit drawing stress obtained from the generalized model is similar to that of the numerical simulation, which indicates that the model is reasonable.
【作者单位】：长沙理工大学道路灾变防治及交通安全教育部工程研究中心;中南大学土木工程学院;
【基金】：国家自然科学基金项目(51408059) 道路灾变防治及交通安全教育部工程研究中心开放基金项目(kfj130302)
【分类号】：U417.11

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