【摘要】 当岩石受力变形和断裂时,会产生声发射现象(弹性波),对其声发射事件的分析,可用来研究岩石裂纹形成机制和断裂过程。本文利用MEMS传感器对花岗岩单轴压裂过程的声发射事件进行研究,发现岩石试样破裂失稳可划分为四个过程。在整个应力加载过程中,声发射事件次数随岩石应变先呈增长趋势,后在岩石发生宏观断裂前呈减少趋势;声发射能量一直呈增长趋势,在岩石宏观断裂时达到最大;其声发射信号的频率一般为200~700Hz,随断裂的发生有降低的趋势。研究同时也表明,可通过对事件本身的定位(微震源定位)来研究岩石断裂位置。因此,MEMS传感器可应用于煤矿、水库和油田压裂等微地震的监测。更多还原

【Abstract】 The rock sample will generate acoustic emission when it was suffering the external or internal loading.The mechanism and process of rock failure is used to study by analyzing acoustic emission.In this paper,through analyzing the signals of acoustic emission under mono-axial compression loading,the total failure process of sample is carefully divided into four procedures.With the loading increasing,the events of acoustic emission gradually increased with the strain changing in the first and began to decrease afterwards before the sample faulting totally.The energy of acoustic emission continuously increased to the maximum when the sample faulting totally.The frequency of acoustic emission was generally the content:200-700Hz and decreased continuously along with the failure process At the same time,the MEMS geophone can be used to monitor the micro-seismic event of coal mining,water reservoir and hydraulic fracturing through the research of failure location.更多还原