温度与干湿循环对红黏土液塑限影响的研究

Effect of Temperature and Dry-Wet Cycles on the Atterberg Limits of Red Clay

温度的变化,影响着红黏土的物性特征,尤其是液塑限等,加上干湿循环的影响,对红黏土的物性特征影响更为明显。为了研究温度与干湿循环对红黏土液塑限的影响,以桂林红黏土为研究对象,在含水率与压实度相同的条件下,分别进行红黏土经历干湿循环与不经历干湿循环的界限含水率实验。试验结果表明:土在不同温度、不同循环次数下的塑限、液限以及塑形指数不是一个定值。对比经历干湿循环与不经历干湿循环的红黏土,在相同温度下,随着循环次数的增加,土样的w_(L)逐渐降低,而土样的w_(P)和I_(P)却没有明显的变化规律;在相同的循环次数下,随着温度的升高,土样的w_(L)和I_(P)呈现先降低后升高,w_(P)呈现逐渐增大的现象。试验成果可以为工程实际提供理论参考。

It is known that the temperature variations and dry-wet cycles have effects on the on the physical properties of red clay.To further accurately study the influence of temperature and dry-wet cycles on the liquid plastic limit of red clay,the Guilin red clay was used as the study target.Under the same conditions of moisture content and degree of compaction,the red clay soil samples were subjected to dry-wet cycles and did not experience dry-wet cycles.The test results show that,the plastic limit,liquid limit and plastic index of the soil at different temperatures and different cycles are not fixed values.Comparing the red clay that has experienced the dry-wet cycle and that did not experience the dry-wet cycle,at the same curing temperature,with the increase of the number of cycles,the w_(L) of the soil sample gradually decreases,but the w_(P) and I_(P) of the soil sample have no obvious change;Under the same number of cycles,as the temperature increases,the w_(L) and I_(P) of the soil samples first decrease and then increase,while the w_(P) gradually increases.