基于耦合计算的土工格栅处治山区路堤细观机理研究

发布时间：2018-05-08 19:33

本文选题：道路工程 + 土工格栅　；参考：《中国公路学报》2014年03期

【摘要】：针对新旧路堤的不均匀沉降问题,结合山区高填方加筋工程,开发离散-连续耦合程序,局部加筋区域采用离散元PFC模拟,外围区域采用连续单元FLAC模拟,分析土工格栅在新旧路堤的受力分布,研究加筋区域土体细观参数的变化,揭示土工格栅处治新旧路堤的细观机理。结果表明:离散-连续耦合方法可作为精细化分析的有效手段;在沉降未达到稳定前,细观上加筋层孔隙率逐渐减小,接触数增大,滑动比变化十分剧烈,宏观上土体进一步压密,加筋层中的土工格栅拉力逐渐增大,筋材加筋作用开始显现;在沉降稳定后期,加筋层孔隙率进一步减小,部分区域孔隙率增大发生剪胀,滑动比数值均较小,一般在8%以下,宏观上表现为沉降已完成。
[Abstract]:Aiming at the problem of uneven settlement of old and new embankments, a discrete continuous coupling program is developed in combination with the high fill reinforcement project in mountainous areas. The discrete element PFC simulation is used for the local reinforced area and the continuous element FLAC simulation is used for the peripheral area. The stress distribution of geogrid in the new and old embankment is analyzed, the variation of soil meso-parameters in reinforced area is studied, and the meso-mechanism of geogrid treating new and old embankment is revealed. The results show that the discrete-time continuous coupling method can be used as an effective means for fine analysis, and the porosity of the reinforced layer decreases gradually, the contact number increases, and the sliding ratio changes sharply before the settlement reaches stability. Macroscopically, when the soil is further compacted, the geogrid tension in the reinforced layer increases gradually, and the reinforcement effect begins to appear. In the late stage of settlement stabilization, the porosity of the reinforced layer decreases further, and the porosity of some regions increases with shear expansion. The sliding ratio is smaller, generally less than 8%, and the settlement is completed macroscopically.
【作者单位】：广西科技大学土木建筑工程学院;同济大学地下建筑与工程系;上海海事大学海洋科学与工程学院;
【基金】：国家自然科学基金项目(51009030) 广西自然科学基金项目(2011GXNSFB018003) 广西防灾减灾与工程安全重点实验室开放课题资助项目(2012ZDK07) 广西科技大学博士基金项目(院科博1011)
【分类号】：U416.12

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