عنوان مقاله [English]
In recent decades, the non-connected piled raft system has been used to cope with substructure vulnerability in piles junction point. This system decreases settlement of foundation. Also, this system is able to decrease stress concentration in pile cap and
improve the mechanism of loading transfer to the soil whose proper performance of non-connected pile raft is dependent on the performance of its components. In this paper, the effect of large and small pile rafts is evaluated on lateral displacement by
abaqus 3d software which is based on finite-element method. In this study, the effects of variation of gravel layer strength and thickness are assessed on foundation settlement. The results show that increasing non-connected piles diameter increases the
proportion of pile group loading capacity. Addition, increasing raft thickness has more influence on the reduction of partial settlement. The results of this paper show that using non-connected pile raft system increases loading capacity of system up to 17\% until 18\%. Also, increasing gravel layer strength leads to decreasing non-connected pile raft settlement up to 1.6 times, whose optimal strength parameters, such as friction angle and young's modulus, suggest 36 degree and 120 mpa, respectively.