During the production of Houhemushan iron mine, ridge hangover of two contiguous routes was difficult to recover in the lower subsection. The thought of adding another route between two primary ones venturesomely to increase recovery magnified dangerousness. Therefore, causes leading to higher quantity of ridge hangover in this iron mine were found and space between two routes was optimized by applying the ore-drawing ellipsoidal theory. Loosening ellipsoidal shapes of multi-funnel drawing were analyzed on the basis of the whole flowing characteristics of ore-rock granules. Production data of this iron mine using non-pillar sublevel caving was combined. The spatial relationship of loosening ellipsoidal shapes, based on contiguous funnels, was finally reverse calculated, providing the basis for optimizing access space. The results show that the relationship between the ranges of short half axis of loosening ellipsoid and drawing ellipsoid is bs=1.82b. The range of bs is 5.90-7.96 m. In other words, the main reason resulting in ridge hangover in this iron mine is that the spatial relationship of two contiguous loosening ellipsoids, based on contiguous funnels, is separated or tangent, and 8-10 m is suitable for the access space. This method provides a new way to analyze the reason why ridge hangover exists in a mine using non-pillar sublevel caving.
WANG Shi
,
ZHANG Qinli
,
WANG Xinmin
. Analysis of Causes for Ridge Hangover in Houhemushan Iron Mine Based on Ore-drawing Ellipsoidal Theory[J]. Science & Technology Review, 2014
, 32(6)
: 59
-62
.
DOI: 10.3981/j.issn.1000-7857.2014.06.009
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