摘要
对不同灰砂比的充填采场模型,加载5,10,15MPa的恒定侧向荷载,进行双向加载试验。利用声发射信息采集设备,对模型在加载过程中的声学信息进行收集、处理,得到不同灰砂比和不同侧向压力下模型的声发射事件率、声发射能量规律曲线,并分析了声发射源定位点与模型破坏部位的关系。研究表明:灰砂比越大,模型弹性阶段略微增长,而声发射率和能量曲线在峰值应力附近震荡越厉害。随着侧向应力的提高,模型压密阶段的完成速率加快,模型进入到塑性阶段的时间延迟,且在峰值应力附近声发射事件率和能量曲线震荡厉害。声发射源定位点的分布规律,可以很好的反映模型的损伤部位。
For filling stope models with different cement-sand ratios,bidirectional loading tests were conducted by adding constant lateral loads of 5 MPa,10 MPa and 15 MPa.Acoustic information of the models during loading was collected and processed by means of acoustic emission signal acquisition equipment.The AE event rates and AE energy law curves of the models with different cement-sand ratios and lateral pressures were obtained,and the relationship between the acoustic emission source location points and the model failure location was analyzed.It can be concluded that with the increase of cement-sand ratio,the elastic stage of the model increased slightly and the AE event rates and energy curves oscillated severely near the peak stress.With the increase of lateral pressure,the completion rate of the compaction stage of the model accelerated,and the time when the model entered to the plastic stage was delayed.Moreover,the AE event rate and energy curve oscillated severely near the peak stress.The distribution law of acoustic emission source location points can well reflect the damage location of the model.
作者
王志国
宋家骏
WANG Zhiguo;SONG Jiajun(College of Mining Engineering. North China University of Science and Technology, Tangshan, Hebei 063009, China;HeBei Province Key laboratory of Mining Development and Safety Technique, Tangshan, Hebei 063009, China)
出处
《矿业研究与开发》
CAS
北大核心
2019年第10期52-58,共7页
Mining Research and Development
基金
河北省自然科学基金资助项目(E2015209260)
唐山市科技计划项目(13130239z)
关键词
组合模型
声发射事件率
声发射能量
声发射源定位点
二维云图
Composite model
Acoustic emission event rate
Acoustic emission energy
acoustic emission source location points
Two dimensional cloud
