杜运兴,袁兰,周芬.预应力加筋体水平土压力及作用机理研究[J].湖南大学学报:自然科学版,2019,(9):100~107
预应力加筋体水平土压力及作用机理研究
Research on Horizontal Soil Pressure and Mechanism Analysis of Unbonded Prestressed Reinforced Body
  
DOI:
中文关键词:  加筋土挡墙  预拉力  土压力  机理分析  模型试验  有限元分析
英文关键词:reinforced earth retaining wall  prestressed  earth pressure  mechanism analysis  model test  finite element method
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作者单位
杜运兴,袁兰,周芬 (湖南大学 土木工程学院湖南 长沙 410082) 
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中文摘要:
      采用缩尺模型试验及三维有限元模拟研究了预应力筋长度对加筋体水平土压力分布的影响及加筋体中预应力筋的预拉力作用机理. 研究表明:墙背土压力的大小与分布规律与预应力筋长度无关;预拉力作用下,预应力筋位置填料的水平土压力沿筋长方向呈两端大中间小的分布规律,其中部填料的水平土压力值增幅随预应力筋长度的增大而减小;随着预拉力的增加,填料水平应力值会超过竖向应力值并与大主应力值完全重合;填料的平均破坏比系数呈先减小后增大的变化趋势,填料的应力水平表明在预拉力作用下填料存在最优的应力状态.
英文摘要:
      The influence of the length of prestressed reinforcement on the distribution of horizontal earth pressure and the prestress mechanism of prestressed reinforcement were studied by using scale model test and three-dimensional finite element simulation. The study showed that the value and distribution of the earth pressure on the panel were independent on the length of prestressed reinforcement. With the action of prestress, the horizontal earth pressure value of prestressed reinforced layer was large at ends and small in the middle along the direction of reinforcement. The increase range of the pressure at middle of the layer decreased with the increase of the length of the prestressed reinforcement. With the increase of prestress, the horizontal stress value of filler can exceed the vertical stress value and coincide with the large principal stress value completely. The average failure ratio coefficient of filler decreased with the increase of prestress, and the stress level of filler presented an optimal safety state for the filler under the action of prestress.
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