Stability in open pit mining. Conference. Preprint

Brawner, C O

doi:10.1016/0148-9062(75)90456-8

Cited by 2 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us discuss the consequences for the Josephson effect separately for each of the above cases. Rather than trying to explain the contradictory experimental results reported so far [1][2][3][4][5][6][7][8], we shall indicate some qualitative predictions of our model.…”

mentioning

confidence: 87%

“…Recently, a number of experiments probing the relative phase of the order parameter ∆ on different parts of the Fermi surface in the superconducting YBa 2 Cu 3 O 7 have been reported [1][2][3][4][5][6][7][8]. Some of them [2,5,7] seem to indicate the conventional pairing state with ∆ having the same sign over the whole Fermi surface, while others suggest that ∆ changes in sign, as consistent, e.g., with the d-pairing.…”

mentioning

confidence: 99%

“…This effect was observed in Refs. [1,3,4] and attributed to the d x 2 −y 2 pairing state. Another consequence is a shift of a Fraunhofer pattern for a single junction formed on the corner of a crystal, because J c changes sign along the junction , as was discussed in Refs.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Sign reversal of the order parameter in s wave superconductors

Golubov

Mazin

1995

Physica C: Superconductivity

View full text Add to dashboard Cite

We show that in a superconductor where two or more bands cross the Fermi level it is possible, in the framework of the conventional (s-wave) BCS theory, that the sign of the superconducting gap is different on the different sheets of the Fermi surface. At least one of two conditions has to be satisfied: (1) The interband pairing interaction is weaker than the Coulomb pseudopotential, while the intraband one is stronger, or (2) there is strong interband scattering by magnetic impurities. In the case of YBa 2 Cu 3 O 7 we shall argue that the first condition is possibly satisfied, and the second one very likely satisfied. In many aspects such a sign-reversal s−wave superconductor is similar to a dwave superconductor, and thus demands revising recent experiments aimed to distinguish between the s− and d−wave superconductivity in this compound.1. Recently, a number of experiments probing the relative phase of the order parameter ∆ on different parts of the Fermi surface in the superconducting YBa 2 Cu 3 O 7 have been reported [1][2][3][4][5][6][7][8]. Some of them [2,5,7] seem to indicate the conventional pairing state with ∆ having the same sign over the whole Fermi surface, while others suggest that ∆ changes in sign, as consistent, e.g., with the d-pairing. The question of the symmetry of the supercon-1

show abstract

mentioning

confidence: 87%

mentioning

confidence: 99%

See 1 more Smart Citation

Sign reversal of the order parameter in s wave superconductors

Golubov

Mazin

1995

Physica C: Superconductivity

View full text Add to dashboard Cite

show abstract

“… Delays and impacts due to weather; and  Slope stability requirements (Brawner and Milligan, 1971). As it can be seen, there are a number of limitations and hazards associated with open cut coal mining however, only the analysis of slope stability is deemed relevant to this topic.…”

Section: Open Pit Miningmentioning

confidence: 99%

“…Open pit mining is ideal for shallow deposits with a generally low dip angle (Brawner and Milligan, 1971). Open pit mining has many advantages including; simple development and access requirements, high production rates and it is relatively flexible (Davidson, 1986).…”

Section: Open Pit Miningmentioning

confidence: 99%

Geotechnical analysis of the stability of a 70 degree highwall vs 45 degree softwall

Proberts¹

View full text Add to dashboard Cite

-Survey Team at Meandu Mine -Sincere acknowledgements for allowing me access to all required data and files to ensure I was able to complete a thorough and accurate analysis.Zane Christensen -Mining Manager at Meandu -I pass my sincere gratitude for allowing me to use the site for my thesis and allowing me to communicate freely with staff on site to complete all required tasks.ii SUMMARY Through researching current literature on highwall and softwall designs as well as their, risks and benefits, major gaps were found in relation to softwalls. Softwalls are generally implemented due to a common and logical engineering assumption that if the angle of a slope is reduced, the stability is increased. However, when applying this into mining situations, it impacts the productivity and in turn, the costs of the mine. Thus, it was deemed worthy of a study to quantify the safety improvements as well as the changes in productivity and costs.Meandu Mine, an open cut coal mine in the Tarong Basin who currently implement a softwall design which allowed for quantitative results to be compiled. Currently, no quantitative analysis has been completed on the benefits or disadvantages, making this study beneficial specifically to the site. The softwall is currently implemented in the Central Pit only, resulting in all analysis being completed for this pit specifically.By analysing how the geological model is generated, it's accuracy was determined and found that the model was highly accurate due to the use of extensive boreholes. However, due to the erratic nature of the faults and geology at Meandu, discrepancies between the model predictions and actual locations of the coal seams and faults occur. From this, a flexibility zone was determined around both the coal seams and the faults to highlight the area in which they were likely to fall. A zone ±1.5m around the seams highlighted the area in which the seam was likely to fall 95% of the time. Similarly, a ±15m zone around faults was determined. The increase in size of the faults was due to the large throw and irregular nature of the them.

show abstract

Stability in open pit mining. Conference. Preprint

Cited by 2 publications

References 0 publications

Sign reversal of the order parameter in s wave superconductors

Sign reversal of the order parameter in s wave superconductors

Geotechnical analysis of the stability of a 70 degree highwall vs 45 degree softwall

Contact Info

Product

Resources

About