局部软弱地基上加筋路堤作用机理及变形特性研究

发布时间：2018-04-04 03:41

  本文选题：局部软弱地基　切入点：加筋路堤　出处：《有色金属(矿山部分)》2016年06期

【摘要】：局部软弱地基上加筋路堤技术具有施工便捷、造价降低、路基承载力提高、路堤不均匀沉降减少等优点,但其作用机理和变形特性相当复杂,国内尚无相关规范可循。通过拉格朗日描述位移的大变形有限元分析法对局部软弱地基上加筋路堤的作用机理及变形特性进行了研究,侧重分析了该类路堤顶部和底部最大差异沉降、路堤中心轴处分荷比等变化规律。结果表明,局部软弱地基上加筋路堤通过土拱效应和拉膜效应的耦合作用分担了部分荷载,从而有效减小了作用在软弱地基上的荷载;路堤填土层间土拱效应受填土高度和软弱区宽度影响较大,软土压缩系数、加筋体抗拉刚度、软弱区深度对土拱效应影响甚微;局部软弱土与加筋体存在"互补作用",但现有的设计方法常忽略此点,偏于保守。
[Abstract]:The technology of reinforced embankment on local soft foundation has the advantages of convenient construction, lower cost, higher bearing capacity of roadbed and less uneven settlement of embankment, but its working mechanism and deformation characteristics are quite complex, and there are no relevant codes to follow in our country.The mechanism and deformation characteristics of reinforced embankment on local soft foundation are studied by means of the finite element method of large deformation which describes the displacement of Lagrange, and the maximum differential settlement between the top and bottom of this kind of embankment is analyzed emphatically.Variation law of charge ratio of central axis of embankment.The results show that the reinforced embankment on the local soft foundation takes part of the load through the coupling of the soil arch effect and the film pulling effect, thus effectively reducing the load acting on the soft foundation.The soil arch effect between embankments is affected greatly by the height of fill and the width of soft zone. The compression coefficient of soft soil, the tensile stiffness of reinforced body and the depth of soft zone have little effect on the effect of soil arch.There is a "complementary action" between the local weak soil and the reinforced body, but the existing design methods often ignore this point and tend to be conservative.
【作者单位】： 福州大学土木工程学院;
【基金】：国家自然科学基金资助(41572253) 高等学校博士学科点专项科研基金博导类资助课题(20133514110004)
【分类号】：U416.12
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本文编号：1708208