Determination of Pre-Consolidation Pressure by Different Method

Abstract

One of the most important soil problems seen on fine-grained soils is the settlement problem. The primary consolidation settlement shows itself over time with the effect of water. Also, the settlement properties of soil change depending on the stress history. In this study, silt mixtures with three different sand percentages were prepared using the slurry sludge preparation method under 50kPa load, and pre-consolidation pressures were calculated by performing the oedometer experiment on the obtained samples. Using the collected oedometer data, the pre-consolidation pressures were calculated and compared by six different methods. As a result, the results equal to the vertical stress values applied for the three mixtures were obtained by Butterfield and Tavenas methods. Sand content was effective in Casagrande, Van Zelst, and Janbu methods, but not in Butterfield, Tavenas, and Shmertman.

Pine cone ash stabilization of expansive soils

“…Furthermore, the Cr values of PC ash-treated soils decreased by 19%, 30%, 30%, and 50%, with PC ash additions of 3%, 5%, 7%, and 10%, respectively. The preconsolidation pressure (σp) was determined from the e versus log σ' curve using the conventional method of Casagrande (Casagrande, 1936;Ural and Küçüker 2021). Comparing the compression curves in Figure 5 with the values reported in Table 4 revealed an increase in σp values.…”