Assessment of Concrete Canal Linings Behavior of Irrigation Canals Constructed on the Positional Modified Bases

In this research the effect of soil modification with lime, on the behavior of concrete linings and acting forces has been numerically studied based on experimental data. Soil improvement has been conducted based on two different methods as removing upper problematic soil as well as local modification of soil around concrete linings with a given thickness. Modeling has been done using Plaxis finite element based model. Experimental uniaxial test data conducted on the original and modified soil samples has been employed to calibration of numerical model. Furthermore, acting forces on the canal linings, under three different operation conditions of canals were investigated. The results revealed that by modification and improvement of mechanical properties of base soil, the acting shear moments on the bed as well as side wall linings reduce, wherever, for mild slopes of side wall is more significant. Based on achieved results, at the horizontal removal method 55% and at the local modification case 20% reduction on the acting bending moment have been realized.