【作者】 计招红；

【导师】 梁波；

【作者基本信息】 重庆交通大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 80年代以来,随着我国公路建设的迅猛发展,在不良地质地区兴建公路日益增多。对于这些土质路基,如何处理路基底部地基、填筑路堤以及进行开挖路堑时的边坡防护就成了制约交通投资和施工工期的重要因素。目前路基的设计和施工方案基本都是根据路基土体的初始和工后的应力状态,而没有考虑施工的过程中土体的应力变化过程,结果往往会与实际情况产生较大的偏差,为此,本文尝试采用应力路径分析方法,以更好地模拟工程实际。首先,本文系统地总结分析应力路径变化对土的抗剪强度、土的应力-应变关系及变形特性的影响,结果表明:由于加载的应力路径不同,土体表现出来的剪切性状也不一样,土的总应力抗剪强度指标大小有所差异;应力路径变化对土的应力-应变关系和变形有着明显的影响。其次,本文归纳总结了应力路径原理在分析地基的稳定性和沉降计算中的应用的各种理论,探讨了有关应力路径分析方法在路堤填筑和路堑边坡工程中的应用理论。第三,本文结合典型路基工程包括地基沉降、路堤填筑、压实以及边坡开挖等实例进行了计算分析,初步论证本文中阐述的应力路径原理和理论在路基工程中应用的正确性。利用应力路径原理在路堤填筑和路堑边坡开挖工程中的应用的理论还处于初步探讨阶段,还有待于在室内试验和实际设计、施工中进一步论证和深化。更多还原

【Abstract】 Since the 1980s, as rapid development of highway construction in China, the construction of highways increasingly increase in bad geological growing. It becomes a important factor how to treat foundation under subgrade and protect slope on fill embankment and excavation cut, and restricts traffic investment and construction period for the soil subgrade. At present, the design and construction programme of subgrade are based on state of initial and complete soil stress on the whole, without taking into account process about stress change in the process of construction, so the actual situation will have a greater difference. Therefor, This paper attempts to use stress path analysis methods, in order to better simulate actual projects.Firstly, this paper systematically generalized the impact of stress path variety for shear strength, constitutive relation and deformation of soil. The results showed that: As the different path of stress load, the shear characters of soil are different, and the total stress shear strength of soil is vary; stress path variety is a distinct impact for constitutive relation and deformation of soil.Secondly,this paper also inextenso and systematically generalized the various theories which are applied to stability analysis and settlement calculations of foundation, and further discussed the application theory about the stress path analysis method with embankment fill and cut slope construction.Thirdly, In this paper, typically examples of the subgrade construction include foundation settlement, embankment fill, compaction, as well as excavating the slope were calculated analysis. at the same time, the correctness of the theory that stress path principle application in subgrade construction was demonstrated.The theory that stress path principle in embankment fill and cut excavation is still in the further exploratory stage, as well as , the existing theories will be further deepened and demonstrated by test in the room, actual design and construction and feasibility studies, and further deepen.更多还原