ABSTRACT

Soft soil as a pavement subgrade leads to early pavement failure or increased pavement thickness. Ground improvement techniques have been used as a solution to this. The published studies on coir waste treated soft soil depict that the adverse volume change characteristics of clayey soils are mitigated by the resistance offered by coir waste. However, on analyzing, it can be seen that the engineering properties of coir waste treated soil are on a lower side. Hence, an additional stabilizer lime was used in combination with coir waste to investigate the enhancement in strength and reduction in deformation behavior. This paper presents the experimental studies carried out to investigate how the addition of lime to soil treated with coir waste affects various aspects like compression behavior, undrained shear strength, and deformation behavior. The degree of expansion and effect of the curing period was also analyzed and an optimized design model was arrived to quantify the strength in terms of lime content added to the coir waste treated soil and its curing period. Design charts for pavement thickness over treated subgrade soil were also developed.

摘要

软土作为路面路基会导致路面早期失效或路面厚度增加。地面改良技术已被用作解决此问题的方法。已发表的关于椰壳废料处理的软土的研究表明，粘土的不利体积变化特征因椰壳废料提供的阻力而得到缓解。但是，通过分析可以看出，椰壳废料处理后的土壤的工程特性偏低。因此，将额外的稳定剂石灰与椰壳废料结合使用，以研究强度的提高和变形行为的减少。本文介绍了为研究向用椰壳废料处理的土壤中添加石灰如何影响压缩行为、不排水剪切强度和变形行为等各个方面而进行的实验研究。还分析了养护期的扩大程度和影响，并得出了一个优化设计模型，以量化添加到椰壳废料处理土壤中的石灰含量及其养护期的强度。还开发了处理过的路基土壤上的路面厚度设计图表。