TRANSMISSION ATTRIBUTES OF BLASTING SEISMIC WAVE IN INTERFACE AND JUDGEMENT OF INTERFACE OBLIQUITY
WANG Guanshi1，HU Shili1，LI Guirong1，LI Shihai2
(1. School of Architectural and Surveying and Mapping Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China；2. Institute of Mechanics，Chinese Academy of Sciences，Beijing 100193，China)
Abstract：Seismic waves are converted into two different types of transmission waves such as P wave and SV wave when seismic wave oblique incident goes through the rock mass interface. At the same time，wave field polarity is altered by rock mass interface. The non-filling interface is simplified as a spring model. Propagation characteristics of blasting seismic wave are analyzed by the spring model. The results show that interface stiffness and the variation of incidence angle can be effectively reflected by waveform transformation of seismic wave in interface and variation of the ratio of peak amplitude values between P wave and SV wave and variation of polarization angle. The ratio of peak values between P wave and SV wave and polarization angle can be calculated by analyzing the field test results. The relationship between polarization angle and incidence angle and transmission coefficient of interface is studied. Interface obliquity can be calculated by analyzing the ratio of peak amplitude values between P wave and SV wave and variation of polarization angle of different survey points that are obtained by field experiment. The field experiment and theoretical results indicate that interface obliquity can be determined by the ratio of peak values between P wave and SV wave and variation of polarization angle at different survey points.
