Research on acoustic emission of rock fracture

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.