蚀变花岗片麻岩破坏过程中声发射事件的演化规律

发布时间：2018-01-05 07:35

本文关键词：蚀变花岗片麻岩破坏过程中声发射事件的演化规律　出处：《岩土力学》2017年08期 　论文类型：期刊论文

【摘要】：通过单轴压缩条件下的声发射试验,分析了蚀变花岗片麻岩破坏过程中声发射事件的演化规律,研究发现:对于多数试件,高能级声发射事件的首次出现可作为岩石处于高应力水平的标志,中能级声发射事件在试件空间内形成贯通分布可作为岩石应力水平进一步上升的标志,最后贯通区出现高能级声发射事件可作为岩石破坏的前兆现象;发生脆性破坏的试件,不会出现中能级声发射事件在试件空间内形成贯通分布的现象;对于含弱区的试件,首个高能级声发射事件会出现于低应力水平,此时岩石内声发射事件呈条带状密集分布于高能级声发射事件周围,其他区域的声发射事件少、能级低。以上研究为利用声发射信息识别岩石应力水平及评价岩石稳定性提供了试验依据。
[Abstract]:The evolution of acoustic emission events in the process of altered granitic gneiss failure was analyzed by acoustic emission test under uniaxial compression condition. It was found that: for most specimens. The first occurrence of high energy level acoustic emission event can be used as a sign that rock is in high stress level, and the breakthrough distribution of medium level acoustic emission event in the specimen space can be used as a sign of further increase of rock stress level. Finally, the occurrence of high-energy acoustic emission events in the through-through area can be regarded as a precursor phenomenon of rock failure. When brittle failure occurs in the specimen, there is no phenomenon that the medium level acoustic emission event forms a through distribution in the specimen space. For the specimen with weak region, the first high-energy acoustic emission event will occur at low stress level, and the acoustic emission event in the rock will be distributed around the high-energy acoustic emission event in a banded form. There are few AE events and low energy levels in other regions. The above studies provide experimental basis for identifying rock stress level and evaluating rock stability by using acoustic emission information.
【作者单位】：东北大学岩石破裂与失稳研究所;
【基金】：国家重点研发计划项目(No.2016YFC0801607) 国家自然科学基金资助项目(No.51604062)~~
【分类号】：TU45
【正文快照】： 声发射(acoustic emission,简称AE)为材料变形或破坏时所释放的弹性波的传播现象。若多个声发射传感器能接收到某一个裂纹产生的声发射撞击(AE hit),就可在提取撞击到时的基础上应用定位程序对裂纹进行定位[1]。任何一个定位结果都可称之为一个声发射事件(AE event)。通过声发

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