公路土基回弹模量分析与研究

【作者】 鲍远骥；

【导师】 郑传超；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2003， 硕士

【摘要】 通过土基顶面弯沉的大量试验数据，分析了FWD、承载板法、贝克曼梁三种弯沉检测方法的相关性；通过野外承载板和室内模拟试验测定土基回弹模量，分析了土基回弹模量与含水量、压实度的关系以及土基回弹模量与土基顶面弯沉的关系，并与其它经验公式进行了比较；对路表弯沉和土基顶面弯沉及土基顶面压应变之间的关系进行了分析，明确了路表弯沉指标和土基顶面压应变对路面结构控制的不一致性，推出了控制土基顶面压应变的设计弯沉公式。最后，通过实例分析了施工控制含水量和压实度的重要性，对土基的施工质量控制以及我国目前施工压实标准的缺陷提出自己的一些见解，以提高土基施工质量。更多还原

【Abstract】 Through many comparison experiments of subgrade top deflection by means of Benkelman Beam, Bearing Plant and Falling Weight Deflection (FWD), the interrelations among above three testing methods are presented. Based on the data measured from outdoor Bearing Plant and indoor analog experiment of earth subgrade resilience modulus, the related expression among earth subgrade resilience modulus, moisture content and degree of compaction, and relationships between earth subgrade resilience modulus and subgrade deflection, are formulated by regression method, simultaneously compared with previous experiential formula. The relationships of surface deflection and subgrade deflection and compressive strain on the top of subgrade are emphatically analyzed. When incompatibility of surface deflection criteria and subgrade compressive strain criteria are pointed out, the design deflection formula of controlling subgrade compressive strain is built up. Finally, the value of moisture content, and degree of compaction in the process of subgrade construction is analyzed through the example. The suggestions on quality control of subgrade construction and deficiency in present compacting standards of our country are put forward to improve quality of subgrade construction.更多还原