组合煤岩体冲击倾向性及破坏特征的电荷规律试验研究

Experimental study on charge law of coal-rock bodies rock burst tendency and failure characteristics

为完善冲击地压灾害的预测判据,采用试验方法研究不同岩煤高度比条件下组合煤岩体冲击倾向性、破坏特征以及破坏过程中电荷感应规律。结果表明,随岩煤高度比的增大,组合煤岩试样的冲击倾向性由弱变强;破坏特征由煤体部分破坏型向煤岩整体破坏型和煤体-底板破坏型过渡;试样冲击倾向性越强,其峰后电荷脉冲数和电荷积累总量越小。可将应力峰后电荷脉冲数和电荷积累总量作为组合煤岩体冲击倾向性及破坏特征的初步判定依据。

In order to improve the prediction criterion of rockburst,experiments were carried out. Rock burst tendencies, failure characteristics, and charge induction laws during the failure process of coal-rock bodies with different height ratios of rock to coal were studied. The results show that the rock burst tendencies of coalrock specimens are reinforced by an increase in the height ratio of rock to coal,that the type of the failure is a function of the ratio--the ratios of 0.67,1.14,and 2.00 correspond to coal partial failure, coal-rock overall failure and coal-floor failure respectively,that the stronger the rock burst tendencies of specimens are, the smaller the charge pulse number and accumulated charge quantity after stress peak will be, and that the charge pulse number and accumulated charge quantity after stress peak can be taken as a preliminary judgement basis for judging rock burst tendency and failure characteristics of coal-rock bodies.