الفهرس 
Interference effects between two closely spaced footings on unreinforced and reinforced sand
Table of ContentsOnly 14 pages are availabe for public view
 |  | from | 109 |  |  |
| | | from | 109 | | |
Abstract
As population and urbanization grow, more sites are required for construction and thus shallow foundations with different configurations may be constructed near each other to accommodate load transfer from super structures to the soil bed. Interference occurs when a number of closely spaced footings are constructed. This occurrence has a significant effect on the ultimate bearing capacity, the settlement, and tilt. Hence, the study of closely spaced footings plays a vital practical consideration in geotechnical and structural engineering. Numerical analysis using the finite element program PLAXIS 3D version 12 was adopted to investigate the effect of interference of two closely spaced footings resting on unreinforced and reinforced sand. The numerical model is verified by comparison with the load-displacement results of two closely spaced circular footings. The effect of the sand relative density is investigated by modeling loose, medium dense and dense sand. The influence of axially loading two closely spaced rectangular and square footings are investigated using the three-dimensional numerical program PLAXIS 3D. A parametric study is performed to investigate the main factors that affect the bearing capacity and settlement of the footings which include sand relative density, distance between footings and number of soil reinforcement layers. The results show that the ultimate bearing capacity and settlement at working stress level of footings on unreinforced soil are almost unaffected for spacings of 3 times the footing width or more. For footings resting on reinforced sand, the ultimate bearing capacity and settlement at working stress are magnified by adjacent footing even for spacing up to 4 times the footing width