Study on triaxial creep and acoustic emission characteristics of surrounding rock under high-stress condition#br#
HE An1，WANG Lu1，2，CHENG Haoyu1，YANG Shuyu1
(1. School of Architecture and Civil Engineering，Xihua University，Chengdu，Sichuan 610039，China；2. College of Water Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China)
摘要针对高应力岩体工程开挖后硐壁附近围岩长期变形问题，利用MTS815 Flex Text GT 岩石力学试验系统和PCI–Ⅱ声发射三维监测系统，针对高应力硐室围岩，开展大理岩试件三轴蠕变试验及声发射实时监测，探讨硐室开挖后围岩在较小侧向压力下的蠕变力学特性和声发射特征。结果表明：大理岩的多级蠕变全过程应力–应变曲线具有5个阶段，岩样具有脆性破坏特征，横向变形较轴向变形具有更显著的蠕变特征；声发射特征表现出明显的应力响应和时效特征，且与典型蠕变3个阶段相匹配，在减速和稳态蠕变阶段，声发射振铃计数率和能量率呈线性增长趋势，加速阶段声发射振铃计数率和能量率呈现指数型增长，且声发射变化对应的时间点提前于应变加速点，可作为大理岩蠕变破坏的前兆特征；基于AF和RA值表征的大理岩内部微裂纹发展特征，大理岩蠕变破坏是张拉破坏和剪切破坏共同作用的结果。
Abstract：Aiming at the long-term deformation of the surrounding rock in the underground rock engineering under the high-stress condition，the triaxial creep tests and real-time acoustic emission monitoring were performed on the marble samples that taken from a high-stress underground engineering by the MTS815 Flex Text GT and PCI–II Acoustic Emission Monitoring System. And the creep mechanical properties and acoustic emission characteristics of the marble were investigated. The results demonstrate that the stress-strain curve comprises five stages throughout the entire process of multi-level creep of marble showing the brittle failure property. Meanwhile，it is noticed that the lateral deformation has more significant creep features than the axial deformation. The acoustic emission shows a clear stress response characteristics and time-dependent effect，which matches the typical three stages of creep. The acoustic emission ringing count rate and energy rate linearly increase in the initial and steady creep stages，while exponentially increase during the accelerated creep stage. Furthermore，the time point corresponding to the change of acoustic emission characteristics is earlier than the strain acceleration point，which can be used to predict the creep damage in marble. Based on the characteristics of internal microcrack development in marble defined by AF and RA values，the creep damage of marble is the result of a combination of tensile and shear damage.
贺 安1，王 璐1，2，成昊宇1，杨姝瑜1. 高应力硐室围岩三轴蠕变及声发射特征研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3367-3376.
HE An1，WANG Lu1，2，CHENG Haoyu1，YANG Shuyu1. Study on triaxial creep and acoustic emission characteristics of surrounding rock under high-stress condition#br#. , 2023, 42(S1): 3367-3376.
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2023, Vol. 42 
