增量循环加卸载下岩石峰值强度前声发射特性试验研究

doi:10.13722/j.cnki.jrme.2018.1410

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摘要为了研究岩石峰值强度前声发射前兆特性、加卸载过程的声发射特性，以指导声发射技术在岩体工程监测和灾害预警中的应用，采用花岗闪长岩、角岩、矽卡岩、铜矿、钨钼矿和铅锌矿共6种岩石分别开展单轴压缩、增量循环加卸载和增量稳压循环加卸载3种不同加载方式的试验，主要对岩样峰值强度前声发射相对平静期、卸载过程的声发射特性、对2种不同循环加卸载方式下的Felicity比以及加卸载响应比的变化情况进行研究。试验结果表明，3种加载方式下部分岩样始终存在“相对平静期”现象，多种岩样的AE事件峰值频率在破坏前总是低频成分显著增加，且越接近破坏，大振幅AE事件就越多。在2种不同循环加卸载方式下，当应力水平达到峰值强度的50%～60%时，Kaiser效应逐渐消失，Felicity效应出现。Felicity比和加卸载响应比在低应力水平阶段均大于1，进入中等应力水平阶段后在1附近波动，但相对比较稳定；进入较高应力水平以后，岩石内部裂纹不稳定扩展，Felicity比逐渐减小，到0.64～0.89时，试样破坏。试验表明，相对平静期、Felicity比和加卸载响应比等可作为预测或判断岩石失稳破坏的参考依据。

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	李庶林1
	周梦婧1
	高真平1
	陈东霞1
	张建霖1
	胡静云2

关键词 ：岩石力学, 循环加卸载, 声发射, 相对平静期, Felicity比, 加卸载响应比

Abstract：In order to study the precursory characteristics of acoustic emission before the peak strength and the acoustic emission characteristics of the loading-unloading process for guiding the application of AE technology in rock mass engineering monitoring and disaster warning, six kinds of rocks including granodiorite，hornfels，skarn，copper ore，wolfram-molybdenum ore and lead-zinc ore were tested respectively under uniaxial compression，incremental cyclic loading-unloading and incremental isobaric cyclic loading-unloading，and the relative tranquil period of acoustic emission before the peak strength，the AE characteristics of unloading process，the Felicity ratio under two different cyclic loading-unloading modes and changes of the load-unload response ratio were studied. The results show that some rocks always present the“relatively tranquil period”phenomenon under three different loading modes. The low frequency components of the AE events of a variety of rock samples increase significantly before failure，and the closer to the failure, the more the large amplitudes AE events. Under two different cyclic loading and unloading ways，Felicity effect occurs with Kaiser effect disappearing when the stress level reaches 50% to 60% of the peak intensity. Both Felicity ratio and load-unload response ratio are greater than 1 in the low stress level and fluctuate around 1 in the middle stress level. In the high stress level stage，the internal cracks of the rocks expand unstably with the Felicity ratio reducing and the load-unload response ratio increasing，and the samples destroy when the Felicity ratio reduces to 0.64–0.89. The Felicity ratio and the load-unload response ratio of the relatively tranquil period may be used as the parameters of rock failure prediction.

Key words： rock mechanics cyclic loading-unloading acoustic emission relatively tranquil period Felicity ratio load-unload response ratio

引用本文:

李庶林1，周梦婧1，高真平1，陈东霞1，张建霖1，胡静云2. 增量循环加卸载下岩石峰值强度前声发射特性试验研究[J]. 岩石力学与工程学报, 2019, 38(4): 724-735.
LI Shulin1，ZHOU Mengjing1，GAO Zhenping1，CHEN Dongxia1，ZHANG Jianlin1，HU Jingyun2. Experimental study on acoustic emission characteristics before the peak strength of rocks under incrementally cyclic loading-unloading methods. , 2019, 38(4): 724-735.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1410 或 http://www.rockmech.org/CN/Y2019/V38/I4/724

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