Prediction of settlement ratio of compressible soil under embankment load using empirical correlation and linear regression

The major part of this paper is on challenges to predicting the ratio of settlement under the toe of embankment (a), outer side embankment (b) and the center of embankment (c). This study uses several variables such as the depth and characteristic of soft soil layer in accordance with the soft soil in Surabaya Indonesia, the width of embankment and the height of embankment. Those variable uses to compare the ratio of settlement depend on those variables. This research was conducted by several empirical approaches to obtain the value of compression index (Cc). The swelling index (Cs) of the soil is made of variation between 1/5-1/10 Cc. The results obtained from this study are the settlement ratio of a/c with soil depth of 10 meters is 0.22 and the soil depth of 20 meters is 0.27. The settlement ratio of b/c if the soil depth of 10 meters is 0.87 and the soil depth of 20 meters is 0.82. The study results showed that the empirical formula of ratio (a/c) is y = 0.0047x + 0.1729; ratio (b/c) is y = -0.0046x +0.9121.