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一、CBR概念和研究意义 路基路面的设计方法先后经历了经验法、半经验半理论法和理论解析法三种设计思想体系。其中,CBR设计法是经验法的代表,至今为许多国家如日本等采用。所谓CBR(California Bearing Ratio加州承载比)是指标准试件(材料在标准的击实层数与次数、含水量、密度)下成型后,标准饱水96h后,进行贯入试验,当贯入量达2.5mm时单位压力与标准碎石压入相同贯入量时标准荷载强度的比值。CBR值作为路基路面材料的强度指标,其性质跟回弹模量E值近似。
First, the concept of CBR and research significance Subgrade pavement design methods have experienced the experience of law, semi-empirical semi-theoretical and theoretical analysis of three design ideas. Among them, the CBR design method is represented by experience, so far for many countries such as Japan adopted. The so-called CBR (California Bearing Ratio) refers to the standard test pieces (materials in the standard compaction layers and the number of water content, density) under the shape of the standard saturated water 96h after the penetration test, when the penetration When the amount of 2.5mm unit pressure and standard gravel into the same penetration into the standard load strength ratio. CBR value as a subgrade material strength indicators, its nature with the elastic modulus E value similar.