采矿与安全工程学报2013，Vol.30Issue(2)：237-242,6.
砂岩损伤破坏的声发射准平静期特征分析
Acoustic emission characteristics in quasi-quiet stage of damage and fracture of sandstone
摘要
Abstract
Accroding to uniaxial rigid loading tests of sandstone, the acoustic emmission (AE) signals present sharp increase characteristics in the yield point, and the strain value corresponding to the yield point is about 74.6% of that in the peaking state. Meanwhile, the time consuming in the unsteady loading stage is relatively long, while the AE signals exit the quasi-quiet stage before the brittle failure of rock samples, and the avearege value of the duration ratio between the durations associated to quiet stage and peaking state respectively is about 8%. In addition, the damage values during the loading process are calculated based on AE information. The results show that there is a rapid growth in the yield point, and the damage value in the inflection point of stress-stain curve in the post-peak is more than 0.9. Moreover, the shape of damage-time curve before the peaking state is concave, while the curve in the post-peak shows the convex type, and the peak value locates in the inflection point of the curve.关键词
声发射/损伤/岩石破裂试验/非稳定破裂/平静期Key words
AE/ damage/ rock failure test/ unsteady fracture/ quiet stage分类
矿业与冶金引用本文复制引用
孙强,张卫强,薛雷,钱海涛,朱术云..砂岩损伤破坏的声发射准平静期特征分析[J].采矿与安全工程学报,2013,30(2):237-242,6.基金项目
国家自然科学基金项目(41102201) （41102201）
中央高校基本科研业务费专项基金项目(2010QNA54) （2010QNA54）
江苏省高校优势学科建设工程项目 （）
国家重点基础研究发展计划(973)项目(2013CB036003) （973）
