红砂岩单轴压缩破坏的声发射信号及时空演化特征

发布时间：2018-04-08 08:00

本文选题：红砂岩　切入点：单轴压缩　出处：《矿业研究与开发》2017年05期

【摘要】：针对红砂岩在单轴压缩下的变形损伤规律和破裂失稳机理,进行了红砂岩单轴压缩的声发射定位实验研究。结果表明:加载过程中声发射信号随时间的变化特征能够反映出红砂岩的张拉破坏模式,声发射定位点首先在岩样的下部产生,随时间的变化定位点数不断增加,并逐渐向上扩展至整个试件,且下部产生的定位点数比上部密集,红砂岩最终发生劈裂破坏,声发射定位点主要集中在裂纹附近;随着有大裂纹的产生,红砂岩临近破坏时声发射定位有突增的特点。研究结果反映了岩样内部裂纹产生和扩展的空间位置以及三维空间演化过程,为研究红砂岩破裂失稳机理提供了依据。
[Abstract]:Aiming at the deformation damage law and fracture instability mechanism of red sandstone under uniaxial compression, the acoustic emission localization experiment of red sandstone under uniaxial compression was carried out.The results show that the variation characteristics of AE signals with time during loading can reflect the tensile failure mode of red sandstone. The AE location points first occur in the lower part of the rock samples, and the number of location points increases with the change of time.And it gradually extends up to the whole specimen, and the location points produced in the lower part are denser than those in the upper part. The red sandstone is finally split and the acoustic emission location point is mainly concentrated near the crack, and with the occurrence of the large crack,The acoustic emission localization of red sandstone near failure has the characteristic of sudden increase.The results reflect the spatial position of crack generation and propagation in rock samples and the three-dimensional spatial evolution process, which provides a basis for studying the failure mechanism of red sandstone.
【作者单位】：中国矿业大学煤炭资源与安全开采国家重点实验室;中国石油华北油田科技信息处;中国石油华北油田分公司煤层气勘探开发事业部;中国石油华北油田分公司采油工程研究院;
【基金】：国家优秀青年科学基金项目(51522406) 国家自然科学青年基金项目(51504250) 江苏省"六大人才高峰"项目资助(2014-ZBZZ-007)
【分类号】：TD313

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