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《Chinese Journal of Geophysics》 2012-10
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Experimental study of velocity characteristic before rock fracture

SHI Xing-Jue,ZHAO Chuang,YANG Ying-Xi,WEN Dan,LI Cheng-Bo University of Science and Technology of China,School of Earth and Space Sciences,Hefei 230026,China  
In order to measure the small change of velocity before rock fracture,the velocity measurement precision must be improved,the methods including digital wave form,the wave stacking,cross correlation and Subsample delay time estimate were used,the precision of time and velocity reached to 0.001 micro second and 1 m/s respectively.The delay time was measured as the stress increase with the interval of 0.17 MPa,then the rule of velocity as stress increase was obtained.Experimental results showed the velocity had the maximum value at the rock strength of 0.98,after that the velocity decreased about 30m/s to fracture.The power of wave at main frequency was calculated and had the same characteristic with velocity,it was considered the changes may be caused by rock dilation.The square error of delay time was discussed by using the fluctuation model.
【Fund】： 高等学校博士学科点专项科研基金资助(20103402110048)资助
【CateGory Index】： TU458
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