The Mechanical Properties Of Rock And Its Relation To The Fractal Dimension Of AE Signal

Acoustic emission technique is an acoustic methods to do research on the properties of rock. Through the rock acoustic emission signal analysis and research, infer the nature of change within the rock, the rock failure mechanism inversion. Which can be used to study the acoustic emission under conditions of external loading rock failure mechanism of rock burst tendency to analyze the tendency of a rock burst by the external load of rock in the acoustic emission during rock burst tendency of law help to understand the dynamic failure of rock stationary process and characteristics.In order to study the AE phenomenon of the rock that under some certain stress,we chose the marble,granite rock and sandstone to do uniaxial compression tests.In the meantime we got the AE signal. Also we got the graph of them.Then we calculated the fractal dimension of the AE signal when the rock failure.Through the analysis of the result,the relationship of the E,the value of the b and Rock burst proneness was obtained.Rock burst proneness of marble,granite and sandstone were studied in this paper, and the emission signal are studied on fractal model. The chief work of the dissertation is in the following:(1)Marble,granite rock and sandstone samples are prepared by circular shape to do uniaxial compression tests, rock impact energy index, elastic strain energy index,, uniaxial compressive strength, elastic modulus and dynamic failure duration under uniaxial compression are calculated, all kinds of rock's burst tendentiousness are analyzed, obtains:granite> Marble>sandstone.(2)Acoustic emission signal is collected in parallel; event counts were analyzed of the all kinds of rock in compress, and were analyzed in conjunction with rock burst proneness.(3)Through the analysis of the relation between E and b,and the relation between b and the fractal dimension D,we got the relation between E and D.And the result of the tests showed that the fractal and the Modulus both had the similar trends.(4)The correlation dimension of acoustic emission are studied to research the fractal dimension of marble granite rock and sandstone under uniaxial compression, analysis the changes and mutual differences, and has studied the relations with the rock burst proneness, obtained some conclusions:under the single axle compression, at the beginning of loading, along with stress unceasing enlargement, the fractal dimension number also unceasingly increases.While before the stress reach the peak,the event of acoustic emission turned quiet and the correlation dimension decreased.