摘要
为了研究不同含水状态岩石损伤演化特性,利用RMT-150C岩石力学试验机、AEwin-USB型声发射信号采集系统和KBD5电磁辐射采集系统,对干燥、自然和饱水状态下的红砂岩进行单轴压缩声电信号监测试验。基于岩石破坏过程中声发射振铃计数、电磁辐射脉冲数和应力变化,建立了砂岩损伤演化模型。结果表明:声发射、电磁辐射信号和损伤变量特征曲线均与岩石应力应变曲线有着较好的一致性;砂岩损伤演化过程可分为初始损伤、损伤持续增长和损伤快速增长三个阶段,随着损伤程度的加深,振铃计数和脉冲数也随之增加;在初始损伤和损伤持续增长阶段中,饱水状态岩样在该阶段的振铃计数和脉冲数占其累计振铃计数和脉冲数的比例最高,自然状态其次,干燥状态最低,而在损伤快速增长阶段则相反。
In order to study the damage evolution characteristics of sandstone with different moisture contents,uniaxial compression acoustic and electrical signal monitoring test was carried out for red sandstone under dry,natural and saturated conditions by using RMT-150C rock mechanics testing machine,AEwin-USB acoustic emission signal acquisition system and KBD5 electromagnetic radiation acquisition system.Based on the acoustic emission bell count,electromagnetic radiation pulse number and stress change during rock failure,the damage evolution model of sandstone is established.The results show that the characteristic curves of acoustic emission,electromagnetic radiation and damage variables are in good agreement with the stress-strain curves of rock.The damage evolution of sandstone can be divided into three stages:initial damage stage,continuous damage growth stage and rapid damage growth stage.As the damage degree deepens,the number of rings and pulses increases.In the stage of initial damage and continuous damage growth,the ratio of ringing count and pulse number in the saturated rock sample in this stage is the highest,followed by that in the natural state and the lowest in the dry state,while it is the opposite in the stage of rapid damage growth.
作者
田芯宇
赵伏军
刘永宏
陈彪
陈品崟
TIAN Xinyu;ZHAO Fujun;LIU Yonghong;CHEN Biao;CHEN Pinyin(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,P.R.China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines.Hunan University of Science and Technology,Xiangtan,Hunan 411201,P.R.China)
出处
《河北工程大学学报（自然科学版）》
CAS
2021年第2期38-43,共6页
Journal of Hebei University of Engineering:Natural Science Edition
基金
国家自然科学基金资助项目(51674116,51474103)。
关键词
含水状态
岩石损伤
声发射
电磁辐射
单轴压缩
moisture condition
rock damage
acoustic emission
electromagnetic radiation
uniaxial compression
