Abstract
In situ stress is one of the most important factors affecting surrounding rock stability classification of coal roadway. Most surrounding rock stability classification methods do not fully consider the influence of in situ stress. In this paper, the author applied a fuzzy clustering method to the classification of surrounding rock stability of coal roadway. Taking into account the complexity of the classification of surrounding rock, some factors such as the strength of surrounding rock, in situ stress, the main roof first weighting interval, the size of the chain pillar, and the immediate roof backfilled ratio are selected as the evaluation indexes. The weight coefficients of these evaluation indexes are determined by unary regression and multiple regression methods. Using fuzzy clustering and empirical evaluation method, the classification model of surrounding rock stability of coal roadway is proposed, which is applied to 37 coal roadways of Zibo Mining Group Ltd., China. The result is in good agreement with practical situation of surrounding rock, which proves that the fuzzy clustering method used to classify the surrounding rock in coal roadway is reasonable and effective. The present model has important guiding significance for reasonably determining the stability category of surrounding rock and supporting design of coal roadway.
Highlights
Coal mines are dominated by underground mining in China. e total length of new driving roadways in coal mines is up to thousands of kilometres per year in China, of which more than 80% are coal roadways and coal-rock roadways [1]
The most widely studied classification methods are based on fuzzy mathematics, analytic hierarchy process (AHP), artificial neural networks (ANN), and support vector machines (SVM), etc
Shi et al [10] adopted comprehensive assigning method to determine the weights of evaluation indexes based on fuzzy analytic hierarchy process (FAHP), and the FAHP model is established for optimized classification of surround rock
Summary
Coal mines are dominated by underground mining in China. e total length of new driving roadways in coal mines is up to thousands of kilometres per year in China, of which more than 80% are coal roadways and coal-rock roadways [1]. In the roadway oblique to the maximum horizontal principal stress at a certain angle, the stress concentration occurs on one rib of the roadway and the stress release occurs on the other rib, so the deformation and failure of the roof (or floor) will be biased towards one rib of the roadway It can be seen from the above analysis that the influence of in situ stress on the stability of the surrounding rock of the roadway must be considered, especially the influence of the horizontal in situ stress on the stability of the surrounding rock of the coal roadway. Combined with the fuzzy clustering, the author proposes a SIM-based classification method for surrounding rock stability of coal roadway: SIM, i.e., the strength of surrounding rock, in situ stress, and mining indexes.
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