Abstract
In this paper, the effect of the burden of neighboring buildings on the stability of holes in a part of coarse-grained alluvial deposits of northern Tehran has been investigated. For this purpose two numerical and partial equilibrium methods have been used with FLAC and SLIDE software. As, the holes in the study area to the depth of 20 m in the without load state of the neighboring building and the building load of the 5-floor building in a distance of 3 meters from the depth edge were analyzed, and the results were compared and finally using the SLIDE software the guardian structure for deep recessed excavations was suggested which with this proposed guardian structure a high reliability coefficient of 1.5 can be achieved.
Highlights
Due to the development of construction in the city of Tehran and the necessity of excavation, the development of geological classification for engineering purposes and in particular excavation seems necessary
Amir Kabir hole is located on the C alluvial of Tehran and numerical results show that in the absence of neighboring building load the depth of excavation is in the range of 1 to 1.5 meters, and the results of the extreme equilibrium method in this case indicate that the depth of the stable hole is in the range of 1 meter
When the load is placed at a distance of 3 meters from the edge of the hole, the results of the numerical method indicate that there is no possibility of stable excavation and the reason is that in the FLAC software in this situation there follows the emergence of a local instability problem and the software cannot solve the total force for the entire system
Summary
Due to the development of construction in the city of Tehran and the necessity of excavation, the development of geological classification for engineering purposes and in particular excavation seems necessary. For this purpose, in the present research, a part of the northwest alluvial deposits of Tehran is investigated in terms of engineering geology, and according to the alluvial the best method of excavation is suggested. In this study sustainability analysis methods (numerical method and partial equilibrium) have been used. Holes stability analysis has been done with numerical and partial equilibrium method for each section in different states in-.
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