Effects of coarse-grained materials on properties of residual soil

✍ Scribed by I.G.B. Indrawan; H. Rahardjo; E.C. Leong

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 802 KB
• Volume: 82
• Category: Article
• ISSN: 0013-7952
• DOI: 10.1016/j.enggeo.2005.10.003

✦ Synopsis

Residual soils are generally characterised by a low coefficient of permeability and high shrinkage potential. Several soil improvement methods can be applied to overcome these problems, including mixing the residual soil with coarse-grained soils. In order to study the effects of varying coarse-grained materials on the hydraulic properties and shrinkage characteristics of residual soils, a local residual soil was mixed with different percentages of a gravelly sand and a medium sand. The hydraulic properties and shrinkage potential of the residual soil and the soil mixtures were investigated. The measurements showed that increasing the amount of coarse-grained materials increased the saturated permeability and reduced the shrinkage potential of the residual soil mixture. Increasing the amount of coarse-grained materials in the residual soil produced changes in several key parameters of soilwater characteristic curve (e.g., the slope, the air-entry value, the residual matric suction, and the residual volumetric water content), as well as the unsaturated permeabilities of the soil mixtures.