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16.09.2020 | Original Paper | Ausgabe 2/2021

Bulletin of Engineering Geology and the Environment 2/2021

Laboratory and field validation of a LTCC recovery prediction model using relative size of the top coal blocks

Zeitschrift:
Bulletin of Engineering Geology and the Environment > Ausgabe 2/2021
Autoren:
Jiachen Wang, Weijie Wei, Jinwang Zhang, Brijes Mishra

Abstract

The recovery ratio of top coal blocks is the direct reflection of drawing effect in longwall top coal caving (LTCC), and predicting the field recovery rapidly and accurately is one of the leading difficult problems. We analyzed the relationship between the recovery and the relative size of top coal, and proposed a recovery prediction model (RPM) in the laboratory. We determined the measurement method of the top coal blocks size, and developed the field setup for measuring the recovery. In addition, we measured the relative size of top coal and the field recovery at four representative LTCC panels in China. The results show that in the laboratory RPM, with increasing relative size of top coal, the recovery increased first and then decreased. Employing the single-opening sequence caving in the panel, the recovery is the maximum when the value of the relative size of top coal is about 0.14. In the field, as thickness of top coal increased, the size distribution curves of top coal gradually changed from convex to concave, and the relative size of top coal gradually increased from 0.005 to 0.202. When the relative size of top coal is large, the recovery also increased and then decreased. However, the value of the field measured recovery is relatively small. When the relative size of top coal is equal to or greater than 0.079, the corrected field RPM can accurately predict the field recovery, verifying the accuracy of the field prediction model. RPM provides a new approach to estimate the recovery, which can greatly reduce the measurement cost and workload, as well as improve the measurement efficiency of recovery.

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