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Morningstar's analyst ratings committee, headed by Russel Kinnel, reviews the rankings to make sure the pillar criteria are properly applied.
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However, there has been significant disagreement on using both factor of safety (FoS) and w/h as part of pillar system stability criterion, as compared to using FoS in isolation.
Funders can and should support collaborative efforts in this direction by including these pillars as grantmaking criteria.
According to the definition, all these criteria (pillars) must be satisfied for a system to be sustainable.
In other words, the three foundational pillars will provide the theoretical panoply, while the case studies will supply the empirical referents (the foundational pillars are used as the criteria for assessing the case studies).
The calculation on coal pillar width based on SMP failure criterion is not only effective, but it will also take an important significance in the secure and efficient production of the coal mine.
This paper will argue that there are valid technical reasons to bring w/h ratio into system stability criteria (other than its influence on pillar strength), as it is related to the post-failure stiffness of the pillar, as measured in situ, and its interaction with overburden stiffness.
In practice, panel width can be designed based on the key strata in the overburden, and the width of chain pillar can be determined based on the criterion of stability with a FOS of 1.3.
However, as the response criteria were created based on the PILLAR and ASPIRE data, a responder analysis was not pre-specified or conducted for the Phase IIb PILLAR and ASPIRE trials.
The safety factor of the pillar is evaluated using Hoek and Brown failure criterion at different advances of goaf edge.
The safety factor of the pillar is evaluated using Hoek and Brown failure criterion (Hoek and Brown 1997) at different advances of goaf edge.
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