掺砂高液限土抗剪强度影响因素分析

Influence Factor Analysis of Shear Strength for High Liquid Limit Soil Mixed with Sand

选取广东省西部地区云罗高速沿线的高液限土为试验材料。通过室内试验研究,分析含水率、压实度对掺砂高液限土黏聚力和摩擦力的影响,并从土体结构和土中水的类型2个方面分析作用机理,得出有益的结论:掺砂改良后高液限土的各项力学指标得到明显改善。土体的黏聚力与含水率、压实度等因素相关,但并不是简单的线性关系,并存在一个特征含水率,且特征含水率并不等于最优含水率,随着压实度的增加而逐渐减小。含水率越小,压实度对土体的黏聚力及摩擦角的影响越敏感。压实度越大,土体的黏聚力及摩擦角越大。

The high liquid limit soil along the Yunluo expressway of Guangdong province is selected as experimental material,and moisture content and degree of compaction affect cohesive force and influence of friction of high liquid limit soil mixed with sand though indoor experimental is analyzed, and mechanism of action from two aspects of soil structure and type of soil water is studied,and useful conclusion was gained,the mechanics indexes of high liquid limit soil improved by sand dramatically improve. The cohesive force of soil is related to factors as the moisture content and degree of compaction,but it is not a simple linear relationship,and there has a feature moisture content which is not the same as the optimum moisture content,and decreases with the increase of the degree of compaction. The smaller the moisture content,the more sensitive degree of compaction affects the influence of the cohesive force and friction angle of soil.