Possible relationships between compression and recompression indices of a low-plasticity clayey soil

Compression (C_c) and recompression (C_r) indices obtained from the oedometer test are necessary in settlement calculation for clayey soil layers. However, the oedometer test takes a long time to measure the compression of clays. This will lead to a very demanding experimental working program in the laboratory. In the literature, a number of researchers have been looking for a possible relationship between C_c and C_r indices and general characteristics of clays. A number of parameters appear to have an effect on the compression of clays. One of these parameters is overconsolidation ratio (OCR). In this study, the effect of OCR and initial void ratio (e_o) on C_c and C_r indices of a low plasticity overconsolidated clayey samples, which were prepared in the laboratory under different isotropic pressures, was investigated. Thus, the oedometer tests were performed on these samples, and consequently C_c and C_r indices were calculated. The results indicate that C _c and C_r indices were influenced by OCR and e_o, and, in most cases, a linear relationship between C_c and C _r indices was observed. The results of this research can provide valuable contributions for academics and practitioners.