二级边坡织物袋挡墙的侧向承载特性研究

Study on Lateral Bearing Characteristics of Geotextile Bag Retaining Wall of Two-Stage Slope

在高速交通快速发展和低碳生活普及大众的背景下,作为生态型的织物袋护坡技术备受关注。为探究织物袋挡墙支护下二级边坡的侧向承载特性,开展了单坎型、L坎型及反坡L坎型条件下二级边坡侧向非均匀加载模型试验,通过测试分析发现二级边坡水平位移大于一级边坡,且土压力随着墙高的增加而增大;通过试验结果对比发现以单坎型支护边坡作为参照,L坎型及反坡L坎型支护的二级边坡坡顶拱起高度分别增大22.2%和59.3%,且二级边坡坡脚处土压力分别增大11.1%和19.2%,一级边坡坡脚处土压力分别增大24.7%和35.8%;通过破坏模式分析发现二级边坡先于一级边坡发生破坏,且二级边坡为滑动型破坏,滑裂面均为圆弧形。最后基于ABAQUS软件验证了模型试验结果的正确性。

Under the background of the rapid development of high-speed traffic and the popularization of low-carbon life, the ecological slope protection technology with geotextile bags has attracted wide attention.To investigate the lateral bearing characteristics of two-stage slopes supported by the geotextile bag retaining wall, we conduct lateral non-uniform loading tests of a two-stage slope under the conditions of inclined support, L-shaped support, and reverse-slope L-shaped support.The analysis of the tests indicates that the horizontal displacement of the two-stage slope is greater than that of a one-stage slope, and the earth pressure increases with the increase in wall height.Through the comparison of test results, it is found that with the slope with inclined support as a reference, the arch height of the slope top is increased by 22.2% and 59.3% in the case of L-shaped support and reserve-slope L-shaped support, respectively, and the earth pressure at the two-stage slope toe is increased by 11.1% and 19.2%,with that at the one-stage slope toe increased by 24.7% and 35.8%,respectively.The failure mode analysis shows that the failure of the two-stage slope occurs before that of the one-stage slope, which is a sliding failure, and the sliding surface is a circular arc.Finally, the correctness of the model test results is verified by ABAQUS.