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Experimental study on the slip evolution of planar fractures subjected to cyclic normal stress
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作者 Kang Tao Wengang Dang +1 位作者 Xian Liao Xingling Li 《International Journal of Coal Science & Technology》 EI CAS CSCD 2023年第4期217-232,共16页
The frictional rupture mechanisms of rock discontinuities considering the dynamic load disturbance still remain unclear.This paper investigates the transitional behaviors of slip events happened on a planar granite fr... The frictional rupture mechanisms of rock discontinuities considering the dynamic load disturbance still remain unclear.This paper investigates the transitional behaviors of slip events happened on a planar granite fracture under cyclic normal stress with diferent oscillation amplitudes.The experimental results show that the activations of fast slips always correlate with unloading of normal stress.Besides,the intensive normal stress oscillation can weaken the shear strength which is recoverable when the normal stress return to constant.The rupture patterns are quantifed by stress drop,slip length and slip velocity.With the efect of small oscillation amplitudes,the slip events show chaotic shapes,compared to the regular and predictable style under constant normal stress.When the amplitude is large enough,the big and small slip events emerge alternately,showing a compound slip style.Large amplitude of the cyclic normal stress also widens the interval diferences of the slip events.This work provides experimental supports for a convincible link between the dynamic stress disturbance and the slip behavior of rock fractures. 展开更多
关键词 Rock fracture Frictional rupture cyclic normal stress Slip transition Rate and state friction law
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FINITE p-GROUPS WHICH CONTAIN A SELF-CENTRALIZING CYCLIC NORMAL SUBGROUP
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作者 郝成功 靳竹萱 《Acta Mathematica Scientia》 SCIE CSCD 2013年第1期131-138,共8页
For any prime p, all finite noncyclic p-groups which contain a self-centralizing cyclic normal subgroup are determined by using cohomological techniques. Some applications are given, including a character theoretic de... For any prime p, all finite noncyclic p-groups which contain a self-centralizing cyclic normal subgroup are determined by using cohomological techniques. Some applications are given, including a character theoretic description for such groups. 展开更多
关键词 finite p-group self-centralizing cyclic normal subgroup 2-nilpotent group cohomology group irreducible complex character
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