en Soil Mechanics Classic Soil Mechanics Classic Research Paper Research Paper <p>This paper describes a series of laboratory model tests on strip footings supported on unreinforced and geogrid-reinforced sand<br> with an inside void. The footing is subjected to a combination of static and cyclic loading. The influence of various parameters<br> including the embedment depth of the void, the number of reinforcement layers, and the amplitude of cyclic load were studied.<br> The results show that the footing settlement due to repeated loading increased when the void existed in the failure zone of the<br> footing and decreased with increasing the void vertical distance from the footing bottom and with increasing the reinforcement<br> layers beneath the footing. For a specified amplitude of repeated load, the footing settlement is comparable for reinforced sand,<br> thicker soil layer over the void and much improved the settlement of unreinforced sand without void. In general, the results<br> indicate that, the reinforced soil-footing system with sufficient geogride-reinforcement and void embedment depth behaves much<br> stiffer and thus carries greater loading with lower settlement compared with unreinforced soil in the absent of void and can<br> eliminate the adverse effect of the void on the footing behavior. The final footing settlement under repeated cyclic loading becomes<br> about 4 times with respect to the footing settlement under static loading at the same magnitude of load applied.</p> Repeated loads, Void, Geogrid reinforcement, Laboratory test, Strip footing, Footing settlement 139 152 http://ijce.iust.ac.ir/browse.php?a_code=A-10-96-2&slc_lang=en&sid=1 A. Asakereh asakereh@alborz.kntu.ac.ir 180031947532846009682 180031947532846009682 No 1Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran S.N. Moghaddas Tafreshi nas_moghaddas@kntu.ac.ir 180031947532846009683 180031947532846009683 No Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran M. Ghazavi ghazavi_ma@kntu.ac.ir 180031947532846009684 180031947532846009684 Yes Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran