Friction characteristics of organic soil with construction materials

The understanding of the basic phenomena controlling the mobilization of friction at soil-solid surface contact is an important task for traditional foundation structures such as piles, micropiles, anchors, etc. In this study, interface frictional characteristics of organic soil and some of solid construction materials such as concrete, steel, and wood were investigated. Interface friction angles of organic soil-solid surfaces were determined for different water content and granular soil content. In addition, the relationship between surface roughnesses and interface friction was investigated. All tests in this study were performed using a direct shear test device under different normal stresses. The test results showed that water and granular soil content of the organic soil, material type, and surface roughness has an effect on frictional resistance between construction material and organic soil.