Laboratory tests of an eccentrically loaded strip footing above single underlying void

Abstract

Underlying voids inherently compromise the bearing capacity and amplify settlement in superstructures. This study presents a series of laboratory model tests examining the ultimate bearing capacity of eccentrically loaded strip footings situated above such voids. Key variables including load eccentricity, void depth, and the horizontal offset between footing and void are systematically analyzed. Comprehensive design tables detailing the ultimate bearing capacities are provided to inform engineering applications. A self-developed digital image correlation (DIC) technique facilitates real-time monitoring of deformation fields within the footing-void system, elucidating the progression of failure mechanisms under varying conditions. Experimental observations identify three distinct failure modes and their evolutionary patterns.