Abstract: This article firstly proposes two problems related to geological structure inversion with acoustic computed tomography (CT):  the results surveyed are different from true stratum layers;  the existing acoustic CT inversion methods are based on wave’s travel route and velocity analysis, which is short of comprehensive analysis of the revealed geological data. Then, it puts forward the method of applying the borehole data to revise acoustic CT investigation result through controlling the boundary velocity. This method comprehensively uses acoustic data and borehole data to invert the rock masses’ shear wave speed. Comparing to calculating the rock mass’ wave speed with acoustic data alone, it makes full use of the information, and the results obtained are closer to real stratum. Finally, it applies the method to engineering project and the results gotten with the method are more accurate, which shows the reliability and accuracy of the method.

Key words: borehole acoustic computed tomography (CT)| borehole data| velocity correction| minimum path algorithm

摘要： This article firstly proposes two problems related to geological structure inversion with acoustic computed tomography (CT):  the results surveyed are different from true stratum layers;  the existing acoustic CT inversion methods are based on wave’s travel route and velocity analysis, which is short of comprehensive analysis of the revealed geological data. Then, it puts forward the method of applying the borehole data to revise acoustic CT investigation result through controlling the boundary velocity. This method comprehensively uses acoustic data and borehole data to invert the rock masses’ shear wave speed. Comparing to calculating the rock mass’ wave speed with acoustic data alone, it makes full use of the information, and the results obtained are closer to real stratum. Finally, it applies the method to engineering project and the results gotten with the method are more accurate, which shows the reliability and accuracy of the method.

关键词: borehole acoustic computed tomography (CT)| borehole data| velocity correction| minimum path algorithm