北山花岗岩三轴压缩下声发射特征及损伤演化规律研究

doi:10.13722/j.cnki.jrme.2018.0634

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摘要

为研究北山花岗岩在不同围压下的力学特征和损伤演化机制，选用MTS815 Flex Test GT电液伺服岩石力学试验系统和PCI–2声发射系统开展三轴压缩声发射试验，建立基于声发射累计振铃计数率的三轴压缩下北山花岗岩损伤演化模型，分析其损伤特性和损伤演化规律。研究结果表明：(1) 北山花岗岩在常规三轴压缩条件下，力学、声发射参数均表现出明显的围压效应，适当提高初始围压，是促进原生裂隙快速闭合、阻碍新生裂隙形成发展的有效途径；(2) 通过对应力–时间–声发射参数曲线分析可知，声发射振铃计数率的不同时段、能量累计数的5个阶段与岩石受压变形的5个阶段有着良好的对应关系；(3) 将损伤演化过程划分为损伤形成阶段、损伤稳定增长阶段、损伤加速增长阶段和损伤破坏阶段，可合理地反应北山花岗岩在不同围压、不同破裂阶段的变形和破坏特征。

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	孙雪1
	李二兵1
	段建立1
	濮仕坤1
	谭跃虎1
	韩阳2
	赵昱乔1

关键词 ：岩石力学, 北山花岗岩, 声发射, 三轴压缩, 损伤模型, 损伤演化规律

Abstract：

anical test system and PCI–2 acoustic emission system. A damage evolution model of Beishan granite based on the cumulative ring counting rate of acoustic emission under triaxial compression was established. Its damage characteristics and damage evolution law were analyzed. The results of the show that：(1) The Beishan granite under the condition of conventional triaxial compression，both mechanical parameters and the acoustic emission parameters show obvious confining pressure effect. Properly increasing the initial confining pressure is an effective way to promote the rapid closure of pre-existing fissures and to prevent the formation and development of new fissures. (2) Through the analysis of the stress-time-acoustic emission parameter curve，it is found that different periods of sound emission ringing counting rate and the five stages of the accumulative number of energy have a good correspondence with the five stages of rock compression deformation. (3) The damage evolution process is divided into damage formation stage，damage stable growth stage，accelerated damage growth stage and damage stage. It can reasonably reflect the deformation and failure characteristics of Beishan granite under different confining pressure and different facture stages.

Key words： rock mechanics Beishan granite acoustic emission triaxial compression damage model damage evolution law

引用本文:

孙雪1，李二兵1，段建立1，濮仕坤1，谭跃虎1，韩阳2，赵昱乔1. 北山花岗岩三轴压缩下声发射特征及损伤演化规律研究[J]. 岩石力学与工程学报, 2018, 37(S2): 4234-4244.
SUN Xue1，LI Erbing1，DUAN Jianli1，PU Shikun1，TAN Yuehu1，HAN Yang2，ZHAO Yuqiao1. Study on acoustic emission characteristics and damage evolution law of Beishan granite under triaxial compression. , 2018, 37(S2): 4234-4244.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0634 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/4234

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