Journal Article

Influence of Load Eccentricity on Performance and Contact Pressures of Ring Foundations on Geogrid-Reinforced Sand

Abrishami, Saeed, Anbarani, Masoud Rezazadeh, Bayat, Meysam

2024

Overview

Eccentric loads applied on ring foundations affect their performance and contact pressure distribution. Nevertheless, reinforcing soils is a passive technique to improve their behavior. The present paper has evaluated the influence of load eccentricity on the behavior and contact pressures of a model ring foundation resting on geogrid-reinforced, very dense sand. Ten tests were carried out in unreinforced and reinforced conditions to this aim. The findings show that an increase in load eccentricity leads to decreasing bearing capacity due to the tilt of the foundation, so that increasing eccentricity ratio to 1/4 led to a substantial reduction of approximately 50% in bearing capacity ratio, and detachment of foundation from the soil surface in its side opposite to load eccentricity. However, reinforcing sand beneath the ring foundation under eccentric loading significantly decreases its differential settlements and improves the load-settlement and load-tilt behavior. The present experimental results are consistent with the analytical method. Moreover, the observations show that the performance of ring foundations under eccentric loading has been improved significantly by reinforcing very dense sand. Contact pressure distribution of the ring foundation tends to change from a saddle shape to a parabolic form due to increased eccentricity. Furthermore, reinforcing sand beneath the foundation leads to the prevention of its detachment from the soil surface.

• Publisher: Korean Society of Civil Engineers,Springer Nature B.V,대한토목학회
• Subject: Bearing capacity / Civil Engineering / Contact pressure / Eccentric loads / Eccentricity / Engineering / Foundation settlement / Foundations / Geogrids / Geotechnical Engineering / Geotechnical Engineering & Applied Earth Sciences / Industrial Pollution Prevention / Performance evaluation / Pressure distribution / Sand / Settling / Soil / Soil bearing capacity / Soil improvement / Soil settlement / Soil surfaces / 토목공학