平顶山矿区深部矿井动力灾害预测方法与应用

Prediction method of deep mining dynamic disasters and its application in Pingdingshan mining area

  • 摘要: 煤与瓦斯突出、冲击地压等矿井动力灾害严重威胁着我国深部矿井安全高效生产,当前总体缺乏准确的预测理论与方法。为了提高平顶山矿区深部开采阶段动力灾害发生的预防与治理水平,在分析矿区自然地质动力条件的前提下,以平顶山东部矿区为研究目标,基于最大主应力、应力梯度等因素对矿区动力灾害发生的潜在危险进行了预测分区,发现地形曲率对平顶山东部矿区的煤与瓦斯突出概率产生较大影响。平顶山东部矿区的正曲率半径范围内煤与瓦斯突出比率占总突出次数的80.21%。同时,基于煤与瓦斯突出系统的能量特征,确定了平顶山东部矿区煤与瓦斯突出的临界能量为10.6J。在前期利用地质动力区划方法划分Ⅰ~Ⅴ级活动构造的研究基础上,进一步考虑开采活动作用的影响,明确目标煤层、目标采区动力灾害发生的模式,进行动力灾害二级预测。对八矿、十矿和十二矿规划区域划分Ⅵ级和Ⅴ级断裂构造,确定该区域断裂构造的分布特征和相互作用关系,建立相应的空间信息分析系统,分析活动构造的活动规律,发现平顶山东部矿区的煤体瓦斯主要受控于褶曲构造、断裂构造和构造之间的复合、联合、组合等地质构造。煤与瓦斯突出事故发生在地质构造带的次数占总次数的69.6%。同时,确定了平顶山东部矿区的区域断裂构造的分布方式,Ⅵ级和Ⅴ级活动断裂区煤与瓦斯突出的局部分布特征。

     

    Abstract: The mine dynamic disasters have seriously threatened the safe production of deep mines in China. However,the theory and method for accurately predicting these disasters are limited. In order to prevent and control the dynamic disasters in the deep mining of Pingdingshan mining area,the natural geo-dynamic conditions of Pingdingshan mining area is studied. The potential dynamic disasters in the coal mine are predicted by using the re- gional indexes such as active structure,maximum principal stress,stress gradient and so on. It is found that the curvature of the terrain has a great influence on the probability of coal and gas outburst in the eastern mining area of Ping- dingshan. The ratio of coal and gas outburst in the positive curvature radius of the eastern mining area of Pingdingshan accounts for 80. 21% of the total outbursts. At the same time,based on the energy characteristics of the coal and gas outburst system,the critical energy of coal and gas outburst in the eastern mining area of Pingdingshan is determined to be 106 J. On the basis of the study on the Division I to V active tectonics by using the geological dynamic zoning meth- od in the early stage,the impact of mining activities is further considered. The patterns of dynamic disasters in the tar- get coal seams and target mining areas are clarified,and the second-level prediction of dynamic disasters is carried out. Class Ⅵ and V fault structures are divided into the No. 8,No. 10 and No. 12 mines,and the distribution character- istics and interaction relationships of the fault structures are determined. The corresponding spatial information analysis system is established,and the activity law of the active structures is analyzed. It is found that the coal body gas in the eastern mining area of Pingdingshan is mainly controlled by the geological structures such as the compound, joint and combination among folds,faults and other geological structures. Coal and gas outburst accidents occur in the geo- logical tectonic belts,accounting for 69. 6% of the total outbursts. At the same time,the distribution pattern of regional fault structures and the local distribution characteristics of coal and gas outbursts in the active fault areas of grade VI and V in the eastern mining area of Pingdingshan are determined.

     

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