Effect of Sand and Sand‐Lime Piles on the Behavior of Expansive Clay Soil

Abstract

Expansive clay soil causes serious problems to many structures due to its swelling and shrinkage during wet and dry seasons. With the existence of expansive soil in Ahkmim new city, Sohag governorate, Egypt, some light buildings, road pavements, and buried pipelines have shown some damage. To avoid such damage, prior to construction, expansive clay soils should be stabilized. Different methods are available to improve the engineering properties of these soils such as densification, chemical stabilization, reinforcement, and techniques of pore water pressure reduction. The chemical stabilization of clay using lime is one of the widespread methods that can be used to improve the behavior of expansive clay soil. This study aims to investigate the effect of both sand and sand-lime piles on the behavior of expansive clay soil. A series of laboratory tests were carried out using the conventional Oedometer apparatus. Sand piles with different replacement area ratios (RARs) (4.68%, 10.16%, 24.6%, 35.84%, and 56.9%) were used. Also, sand piles stabilized with different percentages of lime (3%, 6%, 9%, 12%, 15%, and 20%) and with a replacement area ratio of 35.84% were used. The experimental results showed there is a significant improvement in reducing the swelling potential of expansive clay soil reinforced with sand or sand-lime piles. This improvement increases with the increase of both replacement area ratio and lime content.

Influence of reinforcement method on the crack characteristic parameters of expansive soil experimental study

“…Expansive soil is a kind of high-plastic clay that is sensitive to the change of environmental humidity and has multiple cracks, strong dilatancy, and strength attenuation 1 . Under dry-wet cycles, the repeated expansion and contraction deformation of expansive soil will lead to the formation of cracks and the gradual development of random crack grids 2 .…”

Utilization of River Sand as a Substitution and Addition of Cement to Increase The Shear Strength of Clay Soil

“…To improve fine-grained clay soils, this can be done by substituting clay soils with coarse-grained soil types such as sand. Sand can be used as a stabilizing agent because it can improve soil engineering properties such as natural sand can improve the bearing capacity of black cotton soil [3], sand can reduce the swelling and shrinkage potential of clay soil [4], river sand can improve the properties of subgrade soil. from expansive clay [5], a mixture of clay and sand can increase the cohesion and shear angles in the soil [6].…”

Effectiveness of Mono Sand Piles in Soft Cohesive Ground

“…Sand piles have been proposed as a potential replacement for conventional deep foundations up to a certain degree. Sand piling is a ground-improvement technique that replaces the inadequate soil layer with sand piles produced by drilling holes into the ground and filling them with dense sand [3]. These piles are used to construct a sequence of columns that support the foundation.…”