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Li J.-L.,Henan Polytechnic University | Zhang H.-Y.,Henan Polytechnic University | Wang X.-Y.,Henan Polytechnic University | Feng Y.-L.,Henan Polytechnic University | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

In order to improve the reliability of predicting the coal floor water inrush with the vulnerability index method, the fractal theory was used to analyze and discuss the fault in the southern mining area of Chensilou Coal Mine. On this basis, the AHP vulnerability index method was applied to make the prediction and evaluation of the partition for the danger of the coal seam floor water burst in the region. The results show that: fault density, fault scale, the nature of the fault and other factors are replaced by the fractal dimension (Ds) of the fault spatial distribution, which reduced three main control factors predicted; the predicted results and the actual water inrush location has better fitting (only one water inrush point was not in the predict regional). It can be obtained: Ds is the comprehensive reflection of the fault number, size, combination and dynamics mechanism; the AHP vulnerability index method based on fractal theory is used to predict the coal floor water bursting, which can improve the prediction accuracy.

Feng Y.-L.,Henan University | Liang L.,Henan Longyu Energy Corporation | Duan L.-H.,Henan Longyu Energy Corporation | Li J.-L.,Henan University
Materials Research Innovations | Year: 2015

Mine water-irruption is the second to gas explosion of major security problems. Through studying Chensilou coal mine geological structure, hydrogeological condition and the mine water distribution, the grouting technology, the reasonable grouting scheme was brought. Two sorts of grouting materials coal fly ash and cement, and pure cement material have been tested. Through the comparative and analysis, the compressive strength of limestone by injecting pure cement can reach 40-44 MPa. At the same time, limestone injected with fly ash and cement mixing material is relatively lower 14.3-16.3 MPa. The diffusion radius of injecting fly ash and cement mixed material slurry comes to more than 33 m, but the diffusion radius of injecting pure cement slurry material is 20-30 m. © W. S. Maney & Son Ltd 2015.

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