Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces
This paper presents the results of the shear strength (frictional strength) of cemented paste backfill-cemented paste backfill (CPB-CPB) and cemented paste backfill–rock wall (CPB-rock) interfaces. The frictional behaviors of these interfaces were assessed for the short-term curing times (3 d and 7 ...
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doaj-912d9b94c29943ff905742125a7e62452020-11-24T20:56:07ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552016-08-018447247910.1016/j.jrmge.2016.02.001Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfacesNabassé J.F. Koupouli0Tikou Belem1Patrice Rivard2Hervé Effenguet3Research Institute in Mining and Environment (RIME), Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Québec, CanadaResearch Institute in Mining and Environment (RIME), Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Québec, CanadaDepartment of Civil Engineering, Université de Sherbrooke, Sherbrooke, Québec, CanadaDepartment of Geology, Université Marien NGouabi, Brazzaville, People's Republic of CongoThis paper presents the results of the shear strength (frictional strength) of cemented paste backfill-cemented paste backfill (CPB-CPB) and cemented paste backfill–rock wall (CPB-rock) interfaces. The frictional behaviors of these interfaces were assessed for the short-term curing times (3 d and 7 d) using a direct shear apparatus RDS-200 from GCTS (Geotechnical Consulting & Testing Systems). The shear (friction) tests were performed at three different constant normal stress levels on flat and smooth interfaces. These tests aimed at understanding the mobilized shear strength at the CPB-rock and CPB-CPB interfaces during and/or after open stope filling (no exposed face). The applied normal stress levels were varied in a range corresponding to the usually measured in-situ horizontal pressures (longitudinal or transverse) developed within paste-filled stopes (uniaxial compressive strength, σc ≤ 150 kPa). Results show that the mobilized shear strength is higher at the CPB-CPB interface than that at the CPB-rock interface. Also, the perfect elastoplastic behaviors observed for the CPB-rock interfaces were not observed for the CPB-CPB interfaces with low cement content which exhibits a strain-hardening behavior. These results are useful to estimate or validate numerical model for pressures determination in cemented backfill stope at short term. The tests were performed on real backfill and granite. The results may help understanding the mechanical behavior of the cemented paste backfill in general and, in particular, analyzing the shear strength at backfill–backfill and backfill-rock interfaces.http://www.sciencedirect.com/science/article/pii/S1674775516000299Cemented paste backfill (CPB)Shear testsBackfill–rock wall interfaceShear strengthAdhesionApparent cohesionInterface friction angle |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nabassé J.F. Koupouli Tikou Belem Patrice Rivard Hervé Effenguet |
spellingShingle |
Nabassé J.F. Koupouli Tikou Belem Patrice Rivard Hervé Effenguet Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces Journal of Rock Mechanics and Geotechnical Engineering Cemented paste backfill (CPB) Shear tests Backfill–rock wall interface Shear strength Adhesion Apparent cohesion Interface friction angle |
author_facet |
Nabassé J.F. Koupouli Tikou Belem Patrice Rivard Hervé Effenguet |
author_sort |
Nabassé J.F. Koupouli |
title |
Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
title_short |
Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
title_full |
Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
title_fullStr |
Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
title_full_unstemmed |
Direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
title_sort |
direct shear tests on cemented paste backfill–rock wall and cemented paste backfill–backfill interfaces |
publisher |
Elsevier |
series |
Journal of Rock Mechanics and Geotechnical Engineering |
issn |
1674-7755 |
publishDate |
2016-08-01 |
description |
This paper presents the results of the shear strength (frictional strength) of cemented paste backfill-cemented paste backfill (CPB-CPB) and cemented paste backfill–rock wall (CPB-rock) interfaces. The frictional behaviors of these interfaces were assessed for the short-term curing times (3 d and 7 d) using a direct shear apparatus RDS-200 from GCTS (Geotechnical Consulting & Testing Systems). The shear (friction) tests were performed at three different constant normal stress levels on flat and smooth interfaces. These tests aimed at understanding the mobilized shear strength at the CPB-rock and CPB-CPB interfaces during and/or after open stope filling (no exposed face). The applied normal stress levels were varied in a range corresponding to the usually measured in-situ horizontal pressures (longitudinal or transverse) developed within paste-filled stopes (uniaxial compressive strength, σc ≤ 150 kPa). Results show that the mobilized shear strength is higher at the CPB-CPB interface than that at the CPB-rock interface. Also, the perfect elastoplastic behaviors observed for the CPB-rock interfaces were not observed for the CPB-CPB interfaces with low cement content which exhibits a strain-hardening behavior. These results are useful to estimate or validate numerical model for pressures determination in cemented backfill stope at short term. The tests were performed on real backfill and granite. The results may help understanding the mechanical behavior of the cemented paste backfill in general and, in particular, analyzing the shear strength at backfill–backfill and backfill-rock interfaces. |
topic |
Cemented paste backfill (CPB) Shear tests Backfill–rock wall interface Shear strength Adhesion Apparent cohesion Interface friction angle |
url |
http://www.sciencedirect.com/science/article/pii/S1674775516000299 |
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