不同围压下岩石声发射不可逆性及其主破裂前特征信息试验研究

doi:10.13722/j.cnki.jrme.2015.0947

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Abstract Laboratory experiments on the characteristics of acoustic emission(AE) in high and low frequency channels of granite specimens under different confining pressures of cyclic loading and unloading were carried out. The relationships of the time with stress and AE cumulative counts were analyzed. On the basis，the characteristics of AE irreversibility in rock were studied. Then inverse fast Fourier transform(IFFT) was used to denoise the AE signals at Kaiser points and the characteristics of spectrums of denoised signals were analyzed with fast Fourier transform(FFT). The characteristics before the major fracturing in rock were studied. The basic characteristics of AE counts，the Kaiser effect(KE) and the felicity effect(FE) are similar in two frequency channels. The main difference between the characteristics of cumulated AE counts in two frequency channels is the quantity. The dominant frequencies at Kaiser points mainly distribute in the range of 46.39–70.80 and 151.37–166.99 kHz. With the increasing of axial stress level，the dominant frequencies at Kaiser points shift from the lower frequencies to the higher ones in the low frequency channel and shift from the higher frequencies to lower ones in the high frequency channel before the major fracturing in rock. The upper limit of KE of the granite is about 65% of the ultimate compressive strength. The results of the dominant frequencies at Kaiser points provide evidence for the damage and failure of rock.

Key words： rock mechanics acoustic emission(AE) irreversibility Kaiser point fast Fourier transform(FFT)

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	Articles by authors
	ZENG Peng1
	JI Hongguang1
	SUN Lihui1
	2
	ZHANG Zijian3
	GAO Yu1
	JIANG Hua1
	LI Chengjiang4

Cite this article:

ZENG Peng1,JI Hongguang1,SUN Lihui1, et al. Experimental study of characteristics of irreversibility and fracture precursors of acoustic emission in rock under different confining pressures[J]. , 2016, 35(7): 1333-1340.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0947 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I7/1333

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