Influence of Random Inclusion of Coconut Fibres on the Short term Strength of Highly Compressible Clay

International Conference on Civil Engineering and Infrastructural Issues in Emerging Economies 2017

土木建筑工程;经济学

Sujatha, Evangelin Ramani^1 ; Saisree, S.^1 ; Prabalini, C.^1 ; Aysha Farsana, Z.^1

School of Civil Engineering, SASTRA University, Thanjavur

613401, India^1

关键词: Compaction characteristics;    Compaction curves;    Compressible clays;    Plasticity indices;    Random inclusions;    Soil stabilization;    Stress-strain behaviors;    Unconfined compressive strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012056/pdf
DOI  :  10.1088/1755-1315/80/1/012056

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The choice of natural fibres for soil stabilization provides an economic, safe and eco-friendly alternative to improve the properties of soil. They are an important step forward toward sustainable development. An attempt was made to study the influence of the random addition of untreated coconut fibres on the short term strength of soil, its stress-strain behavior, compaction characteristics and index properties. The soil selected for the study is a highly compressible clay sample with a liquid limit of 52.5 % and plasticity index of 38 %. The soil has no organic content. The study reveals that the compaction curves tend to shift to the right side, indicating more plastic behavior with the addition of fibres. The addition of fibres also reorient the soil structure to a more dispersed fashion. A significant increase in the unconfined compressive strength is also observed. An increase of nearly 51 % in the unconfined compressive strength is observed at 0.75 % coir inclusion. The stress-strain behavior of the soil shows a shift toward more plastic behavior. The mode of failure of the soil specimen is by cracking and with fibre inclusion, length of the failure cracks is restrained as the fibre tends to hold the cracks together, resulting in shorter cracks, with significant bulging of the specimen at failure.