断层落差对逆断层活化规律影响的模拟研究
Simulation Study on Effect of Fault Throw on Activation of Inverse Fault
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摘要: 以某煤矿F5逆断层实际地质资料为背景,采用FLAC3D软件,对逆断层上、下两盘工作面依次回采时断层带的应力演化规律及断层的活化规律进行研究,揭示了工作面采动中落差与逆断层活化之间的联系。研究可知,下盘煤层开采时,断层落差与断层带正应力及两盘滑移量的变化成正比,即随落差的增大而增大,断层也更容易活化;上盘煤层开采时,随着断层落差的增大,断层的两盘滑移量及其所受的正应力均减小,断层落差越小,其活化程度反而越高,突水危险性更大,因此两盘开采呈现不同的规律,在实际中需加以区分,并有针对性地做好防治措施。Abstract: Taking geological data of F5 reverse fault in a coal mine as the background, we use FLAC3D software to study the fault zone stress evolution and faults activation laws when the upper and lower plates of the working face are orderly mined to reveal the relationship between inverse fault activation and throw in mining period. Study shows that the normal stress of fault throw and fault belt is proportional to change of stress and displacement of the two plates in the lower coal seam mining, that is, with the increase of fault throw, the displacement amount of two plates and the normal stress are reduced; the smaller of fault throw is, the higher of activation level is, and the more risk of water inrush is; so, the mining of two plates shows different patterns, needs to be distinguished and prevention measures in practice.
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Keywords:
- fault throw /
- reverse fault /
- numerical simulation /
- activation rule /
- stress evolution
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