Application of electro-osmosis method on Baghdad soft clay shear strength using vane shear test and pile installation efficiency

Abstract

This paper examines the characteristics of soft clayey soils prevalent in the central and southern regions of Iraq. The study focuses on assessing the impact of electro-osmosis (E.O.) on both the shear strength of these soils and the efficiency of pile driving, including the installation of experimental piles. The investigation employs laboratory equipment and locally sourced Baghdad soft clay soil to conduct a comprehensive test program. This program encompasses conventional soil tests and utilizes two specialized soil boxes designed for E.O. to collect essential parameters for pile prototype installation. The primary objective is to explore how E.O. affects the pile driving process. The shear strength was evaluated through four vane shear tests, with vertical E.O. voltage applied at varying depths. The findings indicate that the shear strength in anode regions exceeds control results by up to 100%, with a decrease in strength observed as testing moves towards the cathode. Another significant finding is the Percentage Reduction in Blows, which typically ranges from 65% to 90%. These outcomes were derived from four tests conducted at a soil water content of 25%.