改性红粘土的击实特性试验研究

分别通过掺石灰、掺砂以及掺石灰和掺砂联合对郴宁高速公路三个桩号的红粘土进行了击实试验，分析了干密度与含水量的关系、干密度与掺和比的关系、最优含水率与掺和比的关系以及击实的影响因素。结果表明：掺和不同配合比的外添料后，红粘土击实曲线呈现不同的变化规律。掺石灰的红粘土其最佳含水量随着掺石灰比的增大而提高，而干密度则随着掺石灰比的增大而减少。这是由于石灰引起了粘土颗粒的集聚占了大孔隙改变了土颗粒有效的级配影响了压实效果；掺砂红粘土的最优含水量的和最大干密度随着掺砂比的提高刚好与掺石灰红粘土的变化规律相反；联合采用石灰和砂粒进行改性处理时，最大干密度和最优含水量都处于单独掺料的特征之间，基本变化规律与掺砂处置的情况类似，说明砂粒对红粘土的改性处置效果要大于石灰的影响。

Study on Compaction Characteristics of Artificially Improved Lateritic Soil

According to the compaction test of lateritic soil mixing with lime, sand and blending lime and sand combined respectively, the relationship between dry density and water content, dry density and mixing content, optimum moisture content and mixing content are analyzed. The results showed that： different mix proportion presented different compaction characteristics. Optimum moisture content of lat- critic soil increasing with the mixing content of lime increasing, while dry density decreasing with the the m~ng content of lime increasing. On the contrary, the characteristics optimum moisture content and dry density of lateritic soil mixing with sand are opposite from the mixing lime. Blending lime and sand com- bined compaction test results indicated the effection is between the lateritic soil mixing with lime, sand respectively, and the effectiveness of sand was larger than the lime.