加筋土挡墙-抗滑桩组合支挡结构数值模拟

发布时间：2018-05-11 10:26

本文选题：加筋土挡墙 + 组合支挡结构　；参考：《长江科学院院报》2017年02期

【摘要】：针对软弱土层上方高填方路堤的填筑问题,提出了一种加筋土挡墙-抗滑桩组合支挡结构。采用有限差分软件FLAC3D建立加筋土挡墙-抗滑桩组合支挡结构数值分析模型,着重分析了不同面板浇筑方式对加筋土挡墙墙面水平位移、墙背土压力、桩身水平位移、桩身弯矩和土工格栅应力分布的影响。模拟结果表明:后浇式刚性面板组合支挡结构的墙面水平位移呈线性分布,最大位移出现在墙顶;所受土压力远小于刚性面板;桩身水平位移和弯矩均较大。刚性面板组合支挡结构的土工格栅最大拉应力出现在面板与格栅连接处,而后浇式刚性面板组合支挡结构土工格栅最大拉应力随着层高的增加,出现位置距离挡墙越远。后浇式刚性面板组合支挡结构由于其面板位移和受力较小,性能良好,故其适合在软弱土高填方地区推广使用。
[Abstract]:A reinforced earth retaining wall and anti-slide pile composite retaining structure is proposed to solve the problem of high fill embankment above weak soil layer. The numerical analysis model of reinforced earth retaining wall combined with anti-slide pile is established by using finite difference software FLAC3D. The horizontal displacement of reinforced earth retaining wall, the earth pressure on the back of the wall and the horizontal displacement of pile body are emphatically analyzed by different face slab pouring methods. The influence of pile bending moment and geogrid stress distribution. The simulation results show that the horizontal displacement of the wall surface of the composite retaining structure is linear, the maximum displacement occurs on the top of the wall, the earth pressure is much smaller than the rigid slab, and the horizontal displacement and bending moment of the pile body are larger. The maximum tensile stress of the geogrid of the rigid panel composite retaining structure appears at the junction of the panel and the grid, while the maximum tensile stress of the geogrid of the post-cast rigid panel composite retaining structure increases with the increase of the height of the layer, and the location of the geogrid is farther away from the retaining wall. Due to its small displacement and force and good performance, the post-cast-in-place rigid panel composite retaining structure is suitable to be popularized in high fill area of soft soil.
【作者单位】：华中科技大学岩土与地下工程研究所;
【基金】：国家自然科学基金项目(51278216)
【分类号】：U417.11;U213.152

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