RESEARCH ARTICLE


Stress Distribution in a Cohesionless Backfill Poured in a Silo



Li Li *, 1, 2, Jonathan D. Aubertin 1, Jean-Sébastien Dubé 1
1 Department of Construction Engineering, École de Technologie Supérieure (ETS), Montreal, Quebec, H3C 1K3 Canada
2 Research Institute on Mines and the Environment (RIME), Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, C.P. 6079 succursale Centre-ville, Montreal, Quebec, H3C 3A7 Canada


Article Metrics

CrossRef Citations:
0
Total Statistics:

Full-Text HTML Views: 594
Abstract HTML Views: 1092
PDF Downloads: 471
Total Views/Downloads: 2157
Unique Statistics:

Full-Text HTML Views: 333
Abstract HTML Views: 702
PDF Downloads: 324
Total Views/Downloads: 1359



Creative Commons License
© 2014 Li et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Research Institute on Mines and the Environment (RIME), Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, C.P. 6079 succursale Cen-tre-ville, Montreal, Quebec, H3C 3A7 Canada; Tel: 1-514-340-4711 #2408; Fax: 1-514-340-4477; E-mail: li.li@polymtl.ca


Abstract

The field of infrastructure rehabilitation and development requires a better understanding of soil-structure interactions. The interaction behaviour between soil and structures has mostly been investigated through theoretical and/or numerical analysis. This paper presents a series of experiments performed on an intermediate-scale physical model made of an instrumented silo. In contrast to most reported laboratory tests, both the horizontal and vertical stresses were monitored during backfilling operations realised by wild pouring. Drop tests were performed to investigate the density variation with respect to the drop (or falling) height of the soil, which were introduced in the pressure interpretation. The results showed that horizontal stress in the direction parallel to the pouring plane is larger than that perpendicular to the pouring plane. Apparently, the vertical stress is well-described using the arching solution by considering the backfill in an active state, whereas the horizontal stress perpendicular to the pouring plane is better described with the arching solution by considering the backfill in an at-rest state. An estimate of the earth pressure coefficients based on the measured vertical and horizontal stresses indicates, however, that the backfill was closer to an at-rest state in the direction perpendicular to the pouring plane, whereas in the direction parallel to the pouring plane, it was in a state between at-rest and passive. These results indicate that it is important to measure both the horizontal and vertical stresses to obtain a whole picture of the state of the backfill. The results showed also that the horizontal stresses can be larger than those calculated by the overburden solution, probably due to dynamic loading by drop mass during the filling operation and stress lock.

Keywords: Analytical solution, Arching effect, Backfill, Laboratory tests, Silo, Stress measurement.