Abstract
Real field conditions must be realistically reflected in the laboratory to ensure practical design, safety, and long service life. To eliminate conflicts between reality and modeling, boundary limits need to be considered. In this study, the effects of boundary conditions on the deformation of the embedded material and the stresses in the boundary section were investigated in large-scale and small-scale rigid test boxes. This study aims to show the effects of the boundary conditions selected in laboratory experiments on the deformations of the buried material at different relative density levels, which are determined as loose, mid-dense, and dense conditions. In addition, under the effect of the vertical load applied to the soil surface, the regions where the boundaries of the study area are subject to stress were determined according to the degree of compactness. Buried pipes were used as a measuring assembly to detect deformations in all experiments carried out at both scales on sandy soils representing different relative density conditions. In large-scale tests, deformation on the test box walls was not observed in the experiments where the infinite site conditions were reflected realistically. In experiments where boundary conditions were not considered, stress magnitudes affecting the behavior were observed in small-scale box walls. When the stress distributions were examined in experiments conducted under different relative density conditions, the greatest interaction with the box wall was observed with the loosest soil. For the case where the limits were inadequate, stresses between 56 and 100% reached the wall surface of the small-scale test box, showing higher variable displacements between 1.6 and 2.1 times in the pipe sections compared to the large-scale box. As a result, the study reveals the degree to which the design limits affect the deformation values according to the compactness in full-scale laboratory experiments.
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I would like to thank the Kuzeyboru Company for the supply of pipes and R&D facilities.
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Erenson, C. Experimental Investigation of the Boundary Effects for Flexible Piping Systems from Small to Large Scales. Iran J Sci Technol Trans Civ Eng 47, 3137–3145 (2023). https://doi.org/10.1007/s40996-023-01107-9
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DOI: https://doi.org/10.1007/s40996-023-01107-9