COMPARATIVE STUDY ON UPLIFT BEHAVIOR OF SINGLE BELLED ANCHORS IN HOMOGENEOUS AND, LAYERED SAND BED AND MULTIPLE REGRESSION ANALYSES

This experimental study explains the uplift capacities of single belled anchor models in homogeneous and two-layered (lesser dense sand is underlying higher dense sand) sand bed to evaluate the contribution of embedment ratios of 3, 4 and 5, diameter ratios of 0.28, 0.33, 0.38 and 0.46, and bell angles of 45, 54, 63 and 72°. Higher uplift capacities are achieved in layered sand compared to homogeneous sand deposit in each model regardless the values of embedment ratios, diameter ratios and bell angles. Moreover, it has been observed that uplift capacities in both types of sand strata are increased with higher embedment ratios, lesser diameter ratios and steeper bell angles. An endeavor is made to establish six numbers of multiple regression equations which would be able to predict breakout factors within specified limits. These equations are verified with few present test results which are not used in developing those equations, and the errors in 76.67% and rest 23.33% of predicted values of breakout factors are within the ranges of +08.35 to and +11.48 to based on observed results of present study