As a result of the fact that stabilisation of soil may enhance its technical capabilities, both chemical and mechanical methods of stabilisation are now in use. In this particular research project, expansive soils are made more stable by incorporating Coir fibre, flyash, and CaCl2.It is to your benefit to utilise coconut coir fibre to improve soil quality since these fibres are not only inexpensive but also easily accessible in your area and kind to the environment. Experiments were carried out with the purpose of determining whether or not Coconut Coir Fibre (Natural Fibre) had a stabilising impact on the qualities of the soil. The fly ash that is formed as a byproduct of the burning of subbituminous coals has self-cementing properties and may be put to use in a broad variety of applications that need stabilisation. Therefore, the purpose of this work is to present the findings of a laboratory study that was conducted on soil that had fly ash added to it and that had been reinforced with coir fibres. Furthermore, this paper illustrates that discrete and randomly dispersed coir fibres are effective in strengthening the bearing capacity of soil.The performance of Coir fibre, Cacl2, and fly ash is evaluated using a number of different tests, including unconfined compressive strength (UCS), swelling index test (SI), direct shear test (DST), and California Bearing Ratio test (CBR). The addition of fly ash and CaCl2 has resulted in a reduction in the swelling index of the soil. UCS studies on soil at their respective moisture contents are used to investigate the efficacy of Coir fibre as a soil amendment. In addition, the swelling index test, the CBR test, and the direct shear test are carried out on the stabilised soil. According to the findings of the UCS and CBR tests, the soil that was improved by the addition of 20% fly ash and 15% solution had superior results.It has been shown that soil samples that have been blended with different proportions of coir fibre, CaCl2, and fly ash are more resilient than regular soil samples