Abstract

The seismic force on structure causes instability and could overturn or create unacceptable differential settlement. This paper presents and discusses experimental, theoretical and numerical methods for the study and evaluation of interaction between sandy saturated subsoil and embankment in presence of confined sandy dense column. It is very important predicting structure differential settlement due to dynamic force. For evaluation, dynamic liquefaction ability on sandy model, eight models have been studied. And wave formulas have been employed. The result revealed that the dense zone installed in the subsoil is controlled by the dynamic liquefaction, but it has been observed that after dynamic force mitigated still, some level of dynamic pore water pressure has been appeared and caused differential settlement. This study indicated that the dense zone could only minimize the differential settlement, and it is not able to convert dynamic pore water pressure to linear force, and as long as, dynamic force creates settlement, it is differential settlement. The dynamic pore water pressure act like a wave in vertical direction and if excess higher than limitation creates differential settlement or structure turnover.

Key words: Modeling, dynamic liquefaction, wave formula, differential settlement, seismic mitigation.