组合煤岩冲击倾向电荷判据试验研究
发布时间：2018-10-29 11:00
【摘要】：针对深部煤层冲击倾向指标评价冲击危险出现的差异现象,开展了煤、岩石和组合试样冲击倾向指标试验研究,对组合煤岩试样破裂过程的电荷信号进行监测。试验结果表明:顶、底板岩石对煤体的冲击倾向有显著影响,岩石厚度越大,冲击倾向指标越高;组合试样破裂过程的力-电荷变化具有一致性,冲击倾向性强的组合试样,其应力强化直至破坏阶段的电荷信号幅值相差显著。由此提出了组合煤岩峰后电荷变化率冲击倾向判据。回采面的电荷监测表明,冲击危险发生过程获得的电荷变异系数迅速升高和衰减以及试验获取的峰后电荷变化率的量化分析结果相一致,从而验证了峰后电荷变化率作为冲击倾向判据的正确性,为形成深部开采条件下组合煤岩冲击危险及发生几率的电荷预测方法提供了试验指导,为煤岩体失稳破坏预测、矿井动力显现预警提供了试验依据。
[Abstract]:In view of the difference of impact tendency index in deep coal seam to evaluate the impact danger, the impact tendency index of coal, rock and composite sample was tested and studied to monitor the charge signal of the fracture process of combined coal and rock sample. The test results show that the roof and bottom rock have a significant effect on the impact tendency of coal body, and the larger the rock thickness, the higher the impact tendency index. The stress and charge variation in the fracture process of the combined specimen is consistent, and the amplitude of the charge signal of the composite specimen with strong impact tendency is significantly different from that of the stress strengthening to the failure stage. Therefore, the criterion of charge change rate impact tendency behind the peak of combined coal is proposed. The results of charge monitoring on mining surface show that the coefficient of variation of charge increases rapidly and attenuates rapidly, and the quantitative analysis results of the rate of charge change after peak obtained by experiments are consistent with each other. Therefore, the correctness of charge change rate after peak as the criterion of impact tendency is verified, which provides experimental guidance for the charge prediction method of combined coal and rock impact hazard and occurrence probability under the condition of deep mining, and provides the prediction of instability and failure of coal and rock mass. Early warning of mine dynamic appearance provides experimental basis.
【作者单位】： 辽宁工程技术大学力学与工程学院;东南大学工程力学系;
【基金】：国家自然科学基金资助项目(No.51374123,No.51004061,No.51504122) 2014年辽宁省优秀人才支持计划(No.LJQ2014043)~~
【分类号】：TD324
，
本文编号：2297507
[Abstract]:In view of the difference of impact tendency index in deep coal seam to evaluate the impact danger, the impact tendency index of coal, rock and composite sample was tested and studied to monitor the charge signal of the fracture process of combined coal and rock sample. The test results show that the roof and bottom rock have a significant effect on the impact tendency of coal body, and the larger the rock thickness, the higher the impact tendency index. The stress and charge variation in the fracture process of the combined specimen is consistent, and the amplitude of the charge signal of the composite specimen with strong impact tendency is significantly different from that of the stress strengthening to the failure stage. Therefore, the criterion of charge change rate impact tendency behind the peak of combined coal is proposed. The results of charge monitoring on mining surface show that the coefficient of variation of charge increases rapidly and attenuates rapidly, and the quantitative analysis results of the rate of charge change after peak obtained by experiments are consistent with each other. Therefore, the correctness of charge change rate after peak as the criterion of impact tendency is verified, which provides experimental guidance for the charge prediction method of combined coal and rock impact hazard and occurrence probability under the condition of deep mining, and provides the prediction of instability and failure of coal and rock mass. Early warning of mine dynamic appearance provides experimental basis.
【作者单位】： 辽宁工程技术大学力学与工程学院;东南大学工程力学系;
【基金】：国家自然科学基金资助项目(No.51374123,No.51004061,No.51504122) 2014年辽宁省优秀人才支持计划(No.LJQ2014043)~~
【分类号】：TD324
，
本文编号：2297507
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