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以某边坡膨胀土为研究对象,在对石灰改良膨胀土的抗剪强度形成机理进行分析的基础上,用土力学中常用的快剪试验进行抗剪强度试验,研究了养护时间、初始含水率、掺灰率等与石灰改良膨胀土的凝聚力及内摩擦角的关系,根据试验结果,提出了综合考虑初始含水率与掺灰率的抗剪强度计算公式。结果表明:养护时间与抗剪强度参数不是直线关系,1～7d养护时间的增大值比7～28d大,初始含水率和龄期对凝聚力的影响比内摩擦角的影响大。此外,引用其他学者的试验数据分析了CBR值与养护时间、初始含水率、掺灰率等的关系,结果显示CBR值随着掺灰率的增大而增大,CBR值与初始含水率的关系与击实曲线类似。结合文中试验结果提出了采用最优含水率+3%为最优施工含水率。
Taking a slope expansive soil as the research object, based on the analysis of the formation mechanism of the shear strength of lime-treated expansive soil, the shear strength test was conducted by using the quick shear test commonly used in soil mechanics. The curing time, initial moisture content , The ratio of ash mixing and so on, and the relationship between the cohesion and internal friction angle of lime-treated expansive soils, a formula to calculate the shear strength considering the initial water content and the rate of gray mixing is proposed according to the test results. The results show that the curing time is not linear with the shear strength parameters, and the increase of curing time from 1 to 7 days is larger than that of 7 to 28 days. The effect of initial moisture content and age on cohesion is greater than that of internal friction angle. In addition, the experimental data of other scholars are used to analyze the relationship between CBR value and curing time, initial moisture content and ash blending rate. The results show that the CBR value increases with the increase of the ash mixing rate. The CBR value and the initial moisture content The relationship is similar to the compaction curve. Combined with the test results presented in this paper, the optimal moisture content + 3% is the optimal construction water content.