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通过对现场CBR试验土基破坏模型的分析,认为在CBR试验下土体的破坏性状是局部剪切破坏。进而利用太沙基极限承载理论对现场CBR试验进行力学理论分析,通过对有重力土和无重力土的CBR值预估,确定了土体粘聚力c、内摩擦角φ与其CBR值的关系模型;同时通过对比室内CBR试验与室外CBR试验的预估CBR值,在理论上证明了两者不可对比使用。
Based on the analysis of the failure model of CBR test soil foundation, it is considered that the damage characteristics of soil under CBR test are local shear failure. Then, based on the theory of ultimate bearing capacity, the mechanics theory analysis of CBR test was carried out. Based on CBR estimation of gravity soil and gravity-free soil, the relationship between soil cohesion c, internal friction angle φ and CBR value was determined Model; at the same time by comparing the indoor CBR test and outdoor CBR test estimated CBR value, in theory, proved that the two can not be used in contrast.