冻融循环对花岗岩声发射特性影响的试验研究

doi:10.13722/j.cnki.jrme.2018.0953

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摘要在高寒地区，冻融对岩石声发射特征和抗冻性指标有着重要的影响。针对这一问题，利用在寒区采集的花岗岩试件开展冻融试验和冻融岩石的单轴压缩声发射试验。试验结果表明：花岗岩试件抗冻系数随冻融循环次数的增加而逐渐减小；试件的质量损失率随冻融次数的增加而增大。随着冻融循环次数的增加，试件端部效应趋于明显，试件破坏时的声发射撞击数显著增大。声发射振铃计数可分为接触期、平静期和破坏期3个阶段，随着冻融循环次数的增加，接触期持续时间延长且振铃计数明显增加；平静期振铃计数密度变大，有较多突变点；破坏期振铃计数较大且持续时间较长。随着冻融循环次数的增加，声发射信号峰频点由分散凌乱向优势频段集中，岩石试件临近破坏时，声发射信号峰频优势频段逐渐向中高频段集中，低频段声发射信号不断减少；不同冻融循环作用次数对应的声发射能量概率密度都能较好地满足幂定律分布；表征尺度不变性的临界指数随冻融循环次数的不断增加，呈现出先减小后缓慢增大的趋势。试验结果对在寒区应用声发射技术鉴别和预报岩体的稳定性以及研究岩石冻融损伤机制有重要意义。

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	苏占东1
	孙进忠1
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	吴成龙1

关键词 ：岩石力学, 冻融循环, 抗冻性, 声发射信号峰频点, 声发射能量临界指数

Abstract：In alpine regions，freezing and thawing have an important influence on the acoustic emission(AE) characteristics and the frost resistance index of rock mass. Freezing-thawing tests and the uniaxial compression AE tests of granite specimens from cold areas were carried out. Results show that，as the freezing-thawing cycles increase，the frost resistance coefficient of granite specimens decreases and the mass loss rate gradually increases. With increasing the number of the freeze-thaw cycle，the end effect of the specimen becomes more obvious and AE counts at failure increase significantly. AE ring-down counts can be divided into three stages such as the contact period，the quiet period and the destructive period. With increasing freezing-thawing cycles，the duration of the contact period extends and AE ring-down counts increase obviously，the density of the ring-down counts at the calm period increases with many abrupt points，and AE ring-down counts are larger with a longer duration in the destructive period. As the number of the freezing-thawing cycle increases，the peak frequency points of AE signal are concentrated from the distracted state to a dominant peak frequency. When the sample is near to destruction，the dominant peak frequency of the AE signal gradually concentrates to the mid-high frequency band and the low-frequency of the AE signal reduces continuously. The probability density of the AE energy under different freezing-thawing conditions can meet the power law distribution. The critical index reflecting the scale invariance first decreases and subsequently increases slowly with increasing the number of the freezing-thawing cycles. The experimental results are of important significance for the application of AE technology in the cold region to identify and predict the stability of rock mass and to study the freezing and thawing damage mechanism of rock.

Key words： rock mechanics freezing-thawing cycles frost resistance peak frequency point of AE signal AE energy critical index

引用本文:

苏占东1，孙进忠1，2，夏京1，吴成龙1. 冻融循环对花岗岩声发射特性影响的试验研究[J]. 岩石力学与工程学报, 2019, 38(5): 865-874.
SU Zhandong1，SUN Jinzhong1，2，XIA Jing1，WU Chenglong1. Experimental research of the effect of freezing-thawing cycles on acoustic emission characteristics of granite. , 2019, 38(5): 865-874.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0953 或 http://www.rockmech.org/CN/Y2019/V38/I5/865

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