热带多雨气候论文：热带多雨气候条件下高液限土直接填筑路堤的可行性研究.docVIP

热带多雨气候论文：热带多雨气候条件下高液限土直接填筑路堤的可行性研究 【中文摘要】高液限土天然含水率大，液限高，塑性指数大，水稳定性差，由于物理力学和工程特性，将其直接用于填筑路堤，将产生路基填土难以压实、翻浆、边坡坍塌等一系列病害。因此，系统地开展高液限土路堤直接填筑可行性研究，环保、经济地解决高液限土路堤这些问题，对公路建设具有重要的意义。本文以在建的海口至屯昌高速公路高液限红粘土路段为依托，开展了系统的室内外试验研究，探讨海南热带气候条件下高液限红粘土直接填筑路堤的可行性。在试验段采集原状和扰动样，分别进行了基本物理性质试验、物质组成测试、干法、湿法击实试验、CBR试验、固结试验以及土水特征曲线试验，分析了试样的土质特征和工程特性，评价了其路用性能，得到了高液限土可填筑的临界含水率。通过统计海南热带多雨气候，提出了海南地区高液限土路堤可施工的最佳时段，并结合现场翻晒试验，分析了海南高液限红粘土可以直接填筑而高液限膨胀土难以填筑的原因：高液限膨胀土持水能力强，风干速度过慢，在海南多雨气候条件下难以达到施工条件。基于膨胀土填料分类方法，通过数值模拟翻晒过程，以土水特征曲线拟合参数n为控制参数，提出了热带多雨气候条件下高液限土可以直接填筑路堤新指标。本文通过对海南多雨气候条件下高液限土直接填筑路堤的可行性研究，具有以下创新点：基于土与大气相互作用模型提出了填料翻晒数值模拟方法；提出了以土水特征曲线的拟合参数n为指标热带气候条件下高液限红粘土路堤填料选择标准与方法。对于以后的特殊气候下高液限土填筑路堤具有指导意义。 【英文摘要】The high liquid limit soil has these features:the moisture content is high,the liquidlimit is high,the plastic index is great and the water stability is poor.In view of thephysical mechanics and engineering properties,if using it for filling subgradedirectly,there will be leading to a series of disease, such as compacting the filled soildifficuiltly and slope collapse.Therefore, it is very important for highway constructionthat we have the system to research about filling subgrade directly with high liquid limitsoil and solve the problems above with some environmetal and sparing ways.In this paper, We basing on the high liquid limit of the red clay highwayconstructioning in Haikou Tunchang, carried out laboratory and field test and exploredthe feasibility of the red clay of high liquid limit practicability of constructingembankment in the condition of Hainan抯 tropical climate. In the test, We sectionedacquisition of undisturbed and disturbed samples, respectively test the basic physicalnature , the material composition, the dry and wet compaction, CBR, consolidation, aswell as soil-water characteristic curve, analysis of a sample of soil characteristics andengineering characteristics, evaluated its road performance, finally came to a high liquidlimit soil filling critical moisture content.Through making