Suggesting a Formula to Calculate the Compression Index in Ahvaz

Objective: The compression index is one of the most important parameters in soil mechanics to calculate the settlement of different geotechnical structures, which can be achieve by spending much time and expense through one dimensional consolidation test, therefore this study tries to provide a relation for determining compressibility coefficient by the help of soil parameters. Methods: A great number of experiments were conducted before to use simple and applicable formula for calculating the compression index in different types of soil. This study is resulted from 130 geotechnical studies, carried out in 2 years on the soil of different parts of Ahvaz which after providing the Undisturbed samples from different depths, the one dimensional consolidation, the Atterberg limits, the in situ humidity specification, specifying the specific dried weight, and the gradation tests were carried out on all samples. Findings: After analyzing the whole results obtained from consolidation test, a relation was achieved between compression index and initial void ratio, which can very accurately estimate the compression index. Application: By the help of the obtained relation which is C_c = 0.506 0 e₀-0.1 compressibility coefficient can be estimated with high accuracy to determine the soil settlement at the site of project in Ahvaz city.