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8 models corresponding to different coalbed structure were built on the actual drilling data of a mining area from Wolonghu Coal Mine. By using the method of synthetic seismogram, all synthetic seismograms of above models were achieved. And by using the technique of seismic attribute, the attributes of peak amplitude, trough amplitude, instantaneous amplitude, instantaneous frequency and sweetness were extracted from No. 10 coal reflections of above models. On this basis,the technique of crossplot analysis was used to study the distribution pattern of attribute crossplot points of normal coalbed and magmatic intrusion zone. Then the Monte Carlo simulation was used to simulate new attribute crossplots which closer to actual conditions. After analyzed the simulated attribute crossplots, a quantitative standard of interpreting normal coalbed and magmatic intrusion area was given. After applied this standard on actual data of mining area, the predicted boundaries between normal coalbed and coked area and between coked zone and magmatic intrusion area are fully complied with the validation of drilling and underground mining, and the smallest horizontal error is less than 10 m. [ABSTRACT FROM AUTHOR]

This paper probed into the whole height bench cast blasting process and described the influence factors from 3 major perspectives; natural geological, blasting scheming and factitious ones, and selected the throwing rate which was generally accepted in the cast blasting field to assess the blasting performance. Then a novel GA-SVM model was constructed to analyze the real collected explosion data from open pit mining, and verified in a certain open-pit. Also the MIV method was employed to analyze the influence factor at each input factor. The study indicate that; (T) the presented GA-SVM model performs more robust and accurate than other artificial intelligence models such as BP, RBF, GRNN and GA-BP, which has a more stable prediction accuracy of 83.75%. Moreover, due to the ubiquitous paradigm of the presented approach, it provides a single, unified approach to evaluating other blasting performance factors such as the longest thrown distance and loose coefficient etc; (2) for this certain open pit which maintains a steady lithological character and design parameters, the bench height, explosive specific charge possess a positive correlation coefficient with the throwing rate, while line of least resistance, the slope angle and the profile width perform the opposite. [ABSTRACT FROM AUTHOR]

In order to effectively control gas unbalance phenomenon of gas occurrence in coal mine, this paper put forward the concept of gas enrichment area and gave the general characteristics of gas enrichment area. Based on geological condition in Zhaogu No. 1 Coal Mine, the paper discussed the gas geological features and analyzed the formation mechanism of gas enrichment area in the thick loess-thin bedrock coal seam, and then obtained the recognition method of gas enrichment area by the overlying bedrock characteristic of coal seam. On the basis of which, the gas enrichment area of Zhaogu No. 1 Coal Mine was confirmed, that was the bedrock layer thickness greater than 50 m and coal seam overlying bedrock gradient greater than 0. 06 or the bedrock layer thickness greater than 150 m area. Coal mining practice verified gas enrichment area identification and actual gas occurrence consistency. [ABSTRACT FROM AUTHOR]