Pages: 21-34

Abstract

Regarding the excavation process in urban areas, due to improper and non-standard support of the walls, the walls collapse with the destructive effects on the trench and adjacent structures. Therefore, the aim of this research was to investigate the effect of utilization of the combined nail, anchor and piling system on the displacement and safety factor of the deep and semi-deep pits. The modeling was performed using the numerical method and utilizing the PLAXIS software. For the modeling, three pits of shallow with the depth of 10 m, semi-deep with the depth of 20 m and deep with the depth of 30 m were used. For each studied depth, according to the used reinforcing system, the safety factor and displacement of the pit wall was obtained. The results showed that the maximum displacement of the wall was in the condition that the reinforcement was performed by nailing. The maximum displacement control would be time the piling element was also added to the anchor actuator system. In deep pits, the utilization of the nailing along with the anchor resulted in the increase of the horizontal displacement of the wall. When the anchor element (strands) was used, due to the anchor actuator system operation in decreasing the displacement, the horizontal displacement of the wall was drastically reduced.