岩土工程学报2016，Vol.38Issue(z2)：306-311,6.DOI:10.11779/CJGE2016S2050
花岗岩单轴压缩全过程声发射时空演化行为及破坏前兆研究
Acoustic emission space-time evolution rules and failure precursors of granite under uniaxial compression
摘要
Abstract
To obtain the acoustic emission (AE) space-time evolution characteristics and energy releasing laws during process of rock failure, uniaxial compression tests are carried out by using MTS815 rock mechanics test system and PCI-2 AE system. The test results show that the evolution process of AE time series parameters under uniaxial compression can be divided into 3 stages, including the rising period, quiet period and fluctuation period. The spatial distribution and accurate localization of AE signal source may correspond to the stress concentration and seriously macro-fractured areas of rock. With the increase of stress, AE events are transformed into high-energy and large-crack events from low-energy and micro-crack events, which implies that the micro-cracks are developed into macro-fractures, the specimen is completely destroyed, and most of the energy is released. Based on the characteristics of space-time evolution, the AE quiet period, AE energy rate, AE ring count rate and rock dilatancy can be used to predict the rock damage. The AE energy rate and AE ring count rate are the most sensitive indexes to predict the failure of rocks. Then the followed AE quiet period and rock dilatancy occur. This study may provide some guidance for the monitoring and prediction of rock stability for underground powerhouses in high stress regions.关键词
声发射/时空演化/微破裂/破坏前兆Key words
acoustic emission/space-time evolution/micro-cracks/failure precursor分类
建筑与水利引用本文复制引用
李安强,张茹,艾婷,高明忠,张泽天,刘倩颖,谢晶,贾哲强..花岗岩单轴压缩全过程声发射时空演化行为及破坏前兆研究[J].岩土工程学报,2016,38(z2):306-311,6.基金项目
国家自然科学基金项目（51134018）；国家重点研发计划项目 （）
