综放开采顶煤冒放性预测模型的构建与应用

doi:10.13722/j.cnki.jrme.2018.0505

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Abstract In order to realize quantitative analysis of top-coal cavability and to improve top-coal recovery rate，evolution of ultrasonic wave velocity in uniaxially compressed coal is investigated and an ultrasonic model is established and applied to longwall top-coal cavability assessment by using lab test，theoretical analysis，numerical simulation and field measurement. Ultrasonic propagation speed in the coal remains unchanged during the elastic stage，decreases monotonically with fracture expanding in the subsequent yield stage，and tends to be stable again in the residual stage. Based on evolving features of the velocity during progressive failure process of the coal，distribution of the ultrasonic wave velocity ahead of the longwall face is divided into three classifications including single phase(I)，double phases(I–II) and three phases (I–III). For the single phase distribution，top coal is intact and the top-coal caving method is inapplicable. For the double phase distribution，top-coal cavability is bad and the recovery rate is low(50%–70%). Top-coal cavability is good and the recovery rate is higher than 70% for the three phase distribution. Cumulative plastic strain is used to characterize the development of fractures in the coal，and an ultasonic model is proposed for predicting the wave velocity. The ultrasonic model is coupled with the constitutive model to achieve accurate simulation of progressive failure process and ultrasonic wave velocity evolution in compressed coal. The developed model is validated by comparisons against experimental data and applied to assess longwall top-coal cavability in Xinliu coal mine. Numerical results indicate that the ultrasonic wave velocity distribution belongs to I–III type，which is verified by the in situ measured top-coal recovery rate of 83.3%. Accuracy of the prediction is also verified by field measurements of the vertical stress and the ultrasonic wave velocity. Thus，the model can be used to predict top-coal cavability in different mining conditions.

Key words： mining engineering thick coal seam ultrasonic wave velocity fracture propagation longwall top-coal caving mining top-coal cavability

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	WANG Zhaohui1
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	WANG Jiachen1
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	WANG Kai1

Cite this article:

WANG Zhaohui1,2,WANG Jiachen1, et al. A model for top-coal cavability assessment and its application in longwall top-coal caving[J]. , 2019, 38(1): 49-62.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0505 OR http://www.rockmech.org/EN/Y2019/V38/I1/49

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