| 复合填料一维冻胀量数值模拟分析 |
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| 引用本文： | 祁生旺,邓安.复合填料一维冻胀量数值模拟分析[J].防灾减灾工程学报,2012(5):600-605. |
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| 作者姓名： | 祁生旺 邓安 |
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| 作者单位： | 河海大学岩土工程研究所、岩土力学与堤坝工程教育部重点实验室 |
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| 基金项目： | 江苏省自然科学基金项目(BK2009027)资助 |
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| 摘 要： | 复合填料是以废铸砂、粉煤灰、聚苯乙烯颗粒(EPS)、水泥和水为原料,拌合后形成的一种轻质填筑材料。其中,EPS颗粒含量适当时,能减少或消除复合填料的冻胀和融沉,可作为季节性冻土区的路基填料。假设复合填料中除EPS颗粒外的骨料颗粒、孔隙冰为刚性介质,同时考虑EPS颗粒变形和填料孔隙变形对复合填料冻结过程的影响,在已有的冻土水热耦合分离冰模型的基础上,得到考虑EPS颗粒变形影响的饱和填料一维冻结水热耦合控制方程,进而预测填料的冻胀量。与室内模型试验结果对比表明,本文模型可用于该种具有弹性颗粒复合填料的冻胀量模拟,为工程中冻胀量预测提供依据。
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| 关 键 词： | 复合填料 聚苯乙烯(EPS)颗粒 水热耦合 冻胀量 数值模拟模型 实验验证 |
Numerical Study on One-dimensional Frost Heave Amount of Composite Backfill |
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| QI Sheng-wang,DENG An.Numerical Study on One-dimensional Frost Heave Amount of Composite Backfill[J].Journal of Disaster Prevent and Mitigation Eng,2012(5):600-605. |
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| Authors: | QI Sheng-wang DENG An |
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| Institution: | (Geotechnical Research Institute,MOE Key Laboratory for Geomechanics and Embankment Engineering, Hohai University,Nanjing 210098,China) |
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| Abstract: | A composite backfill is a kind of light backfill formed by mixing waste foundry sand,flyash,expanded polystyrene(EPS) beads,cement and water in designated proportions.Inclusion of EPS beads can reduce or eliminate frost heave and thaw settlement,and thus can be used as backfill of road base in seasonal frost areas.A one-dimensional frost heave model was established based on the current moisture-heat coupling model.The model is able to take account of the elastoplastic behavior of EPS bead and its effect on frost heave taken place within the mass of composite backfill.The results given by the model are in a good agreement with the test results achieved from a previous companion study,which validates the use of this model in the prediction of frost heave of engineering works in seasonal frost areas. |
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| Keywords: | composite backfill expanded polystyrene beads moisture-heat coupling frost heave amount humerical simulation model experimental verification |
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