深埋变质灰岩单轴加载声发射试验研究
摘要:深度挖掘声发射的各特征参数，对于研究岩石损伤演化特征、理解岩石破裂机制、预测预报岩体失稳等方面具有重大意义。通过开展单轴压缩声发射试验，对变质灰岩的损伤破裂机制进行深入研究。研究表明:变质灰岩具有显著的硬脆性，试验过程中AE事件数、振铃计数与能量均呈现出初始较小—缓慢增长—急剧增长—缓慢增长的相似变化趋势；AE事件时空定位结果显示，在试验加载初期，岩石内部AE事件较少，随着荷载增加，AE事件首先在岩样上端部积聚，然后逐渐向中部扩展，直至贯穿试样底部，AE定位结果与岩样的破坏特征相符；通过AE监测技术可以研究岩石在加载全过程中的裂纹起裂、成核、扩展、交汇贯通的破裂过程，对于研究岩石的损伤破坏全过程具有指导意义。
Abstract:Deeply excavating the parameters of acoustic emission has great significance to research the characteristics of rock damage evolution,to understand the mechanism of rock fracture,and to predict the instability of rock mass and so on.Through the uniaxial compression with acoustic emission test,the damage and fracture mechanism of metamorphic limestone was studied deeply.The study shows that:The metamorphic limestone has significant hard and brittle characteristic,and during the test,the number of AE events,ringing count and energy showed a similar change trend of initial small-slow growthrapid growth-slow growth;the AE event space and time positioning results show that in the early stage of experimental loading,there were fewer AE events in the rock sample,and with the increase of load,the AE event first accumulated at the top of the rock sample and then gradually extended to the middle until it passed through the bottom of the sample,and the AE positioning results were consistent with the failure characteristics of rock sample.Through the AE monitoring technology,we can research the whole process of crack initiation,nucleation,expansion and interchange of the rock sample under loading,and it is of great significance to study the whole process of damage and failure of rock.
中文标题：
深埋变质灰岩单轴加载声发射试验研究
Research on Acoustic Emission of Deep Buried Metamorphic Limestone under Uniaxial Loading Test
作者：
李志鹏
Li Zhipeng
作者简介:李志鹏,男,1988年生,汉族,河北保定人,博士,工程师,主要从事工程地质勘察方面的研究和生产工作。E-mail:676370583@qq.com
通讯地址：
中国铁路设计集团有限公司, 天津 300142
ChinaRailwayDesignCorporation,Tianjin300142,China
中图分类号:TU458
doi:10.3969/j.issn.1007-2993.2018.01.001
出版物：岩土工程技术
收稿日期:2017-09-11
网络出版日期:2021-07-06
关键词:变质灰岩,单轴压缩,声发射,岩石损伤,破裂机制
Key words:metamorphic limestone,uniaxial loading,acoustic emission,rock damage,failure mechanism
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