A NEW APPROACH FOR INVESTIGATING THE ENGINEERING BEHAVIOR AND MECHANICAL PROPERTIES OF BONDED SANDY SOILS.
Keywords:Bonded soil, Bonding index, Brittleness, Triaxial test, sand
Cemented soils are widely encountered in the world, and with the growth of population, their exploitation becomes a necessity, especially, by building on diverse engineering infrastructures. The stability of those infrastructures is directly related to the nature and the properties of bonding in presence. This paper aims to investigate a new approach in studying the engineering behavior and mechanical properties of bonded sandy soils of different bonding levels, by using artificial soils similar to natural ones. The investigation was performed on four types of artificially bonded materials and one unbonded soil. The experiment was conducted in the laboratory under consolidated undrained isotropic triaxial compression tests subjected to three different levels of confining pressure. A new parameter, bonding index ( ), was defined to implement the new approach. It is found that the variation of bonding and confining pressure alters significantly the response of soils. The cohesion intercept, the friction angle, the shear stress, and the brittleness index increase together with , especially at low confining stress. However, decreases when the confining pressure increases, restraining the role of bonding strength. Soils with higher are identified to be more brittle. The determination of the confining stress level is found to be related to the bonding degree, which is expressed in terms of . The bonding index is assessed as an efficient parameter whereby the bonded soil response can be investigated. Thus, the new approach offers an alternative for studying the engineering behavior of bonded soils.