Seismic table investigation of the effect of inclusions on the cyclic behaviour of tailings

When subjected to cyclic loadings, such as those induced by earthquakes, hard rock mine tailings may undergo liquefaction. Such a response can be damaging to the tailings impoundment and, in the case of a breach, to the surroundings. Means must thus be considered to control or alleviate the risks due to liquefaction. This paper presents the main results of a laboratory investigation that focussed on the dynamic behaviour of tailings due to cyclic loading on a seismic table. Different conditions were investigated to assess the influence of various factors, including tailings density and the presence of rigid and (or) drainage inclusions. The main results obtained during the tests conducted on the tailings, with and without inclusions, are presented and discussed with an emphasis on the development of excess porewater pressures. The main limitations of this experimental work are also discussed. These results show that inclusions can have a significant effect on the dynamic response of the tailings and on the occurrence of liquefaction.

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On The Dynamic Behaviour of Automobile Pulleys Under Cyclic Loading

Karbala International Journal of Modern Science ◽

10.33640/2405-609x.1603 ◽

2020 ◽

Vol 6 (2) ◽

Author(s):

Haval Kamal Asker ◽

Thaker Saleh Dawood

Keyword(s):

Cyclic Loading ◽

Dynamic Behaviour

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Potential Use of Organic- and Hard-Rock Mine Wastes on Aided Phytostabilization of Large-Scale Mine Tailings under Semiarid Mediterranean Climatic Conditions: Short-Term Field Study

Applied and Environmental Soil Science ◽

10.1155/2012/895817 ◽

2012 ◽

Vol 2012 ◽

pp. 1-15 ◽

Cited By ~ 25

Author(s):

Claudia Santibañez ◽

Luz María de la Fuente ◽

Elena Bustamante ◽

Sergio Silva ◽

Pedro León-Lobos ◽

...

Keyword(s):

Mine Tailings ◽

Large Scale ◽

Management Practices ◽

Hard Rock ◽

Mine Waste ◽

Organic Amendments ◽

Dry Weight ◽

Climatic Conditions ◽

Goat Manure ◽

Site Rehabilitation

The study evaluated the efficacy of organic- and hard-rock mine waste type materials on aided phytostabilization of Cu mine tailings under semiarid Mediterranean conditions in order to promote integrated waste management practices at local levels and to rehabilitate large-scale (from 300 to 3,000 ha) postoperative tailings storage facilities (TSFs). A field trial with 13 treatments was established on a TSF to test the efficacy of six waste-type locally available amendments (grape and olive residues, biosolids, goat manure, sediments from irrigation canals, and rubble from Cu-oxide lixiviation piles) during early phases of site rehabilitation. Results showed that, even though an interesting range of waste-type materials were tested, biosolids (100 t ha-1dry weight, d.w.) and grape residues (200 t ha-1d.w.), either alone or mixed, were the most suitable organic amendments when incorporated into tailings to a depth of 20 cm. Incorporation of both rubble from Cu-oxide lixiviation piles and goat manure into upper tailings also had effective results. All these treatments improved chemical and microbiological properties of tailings and lead to a significant increase in plant yield after three years from trial establishment. Longer-term evaluations are, however required to evaluate self sustainability of created systems without further incorporation of amendments.

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Effect of a one-time application of municipal biosolids on plant growth at a metal mine tailings impoundment in a semi-arid climate, Utah, USA

International Journal of Surface Mining Reclamation and Environment ◽

10.1080/09208119808944018 ◽

1998 ◽

Vol 12 (1) ◽

pp. 29-35 ◽

Cited By ~ 3

Author(s):

R.L. McNearny ◽

Elena B. Belyaeva

Keyword(s):

Plant Growth ◽

Mine Tailings ◽

Arid Climate ◽

Tailings Impoundment ◽

Metal Mine ◽

Municipal Biosolids ◽

Semi Arid

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Fire spreading experiments on heterogeneous fuel beds. Applications of percolation theory

Canadian Journal of Forest Research ◽

10.1139/x00-047 ◽

2000 ◽

Vol 30 (8) ◽

pp. 1318-1328 ◽

Cited By ~ 17

Author(s):

Jean Nahmias ◽

Hervé Téphany ◽

José Duarte ◽

Sophie Letaconnoux

Keyword(s):

Experimental Work ◽

Percolation Theory ◽

Dynamic Behaviour ◽

Fire Spread ◽

Directed Percolation ◽

Final State ◽

Critical Thresholds ◽

Scale Models ◽

Different Types ◽

Fire Spreading

In the experimental work presented here, fire spread was studied through various laboratory and full-scale models containing different types of combustible and noncombustible materials. We have examined the dynamic behaviour of the flame front and the final state (after extinction) on randomly created heterogeneous zones, both with and without wind. The principal conclusion is that critical thresholds exist, for the ratio between combustible and noncombustible parts, at the transition between nonpropagation and propagation of the fire. This result is common to all types of spreading (with or without wind). The values of the critical thresholds in the nonwind-driven experiments are those of the percolation theory. The critical exponent, obtained for wind-driven experiments, is in accordance with current values suggested by the directed percolation approach.

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Comparing the Seismic Performance of Beam-Column Joints with and without SFRC when Subjected to Cyclic Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.85 ◽

2012 ◽

Vol 626 ◽

pp. 85-89 ◽

Cited By ~ 7

Author(s):

Kay Dora Abdul Ghani ◽

Nor Hayati Hamid

Keyword(s):

Energy Dissipation ◽

Cyclic Loading ◽

Seismic Performance ◽

Experimental Work ◽

Concrete Beam ◽

Steel Fiber ◽

Precast Concrete ◽

Experimental Results ◽

Column Joint ◽

Initial Cracks

The experimental work on two full-scale precast concrete beam-column corner joints with corbels was carried out and their seismic performance was examined. The first specimen was constructed without steel fiber, while second specimen was constructed by mixed up steel fiber with concrete and placed it at the corbels area. The specimen were tested under reversible lateral cyclic loading up to ±1.5% drift. The experimental results showed that for the first specimen, the cracks start to occur at +0.5% drifts with spalling of concrete and major cracks were observed at corbel while for the second specimen, the initial cracks were observed at +0.75% with no damage at corbel. In this study, it can be concluded that precast beam-column joint without steel fiber has better ductility and stiffness than precast beam-column joint with steel fiber. However, precast beam-column joint with steel fiber has better energy dissipation and fewer cracks at corbel as compared to precast beam-column joint without steel fiber.

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