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Sound wave CT of the cement injection quality detection and comparison between its effect with that of the comprehensive detection

LEI Wan~1,XIAO Hong-yue~2,ZHONG Tao~1,TANG Li~31.College of Information Engineering,Chengdu University of Technology,Chengdu 610059,China;2.College of Network,Chengdu University of Technology,Chengdu 610059,China;3.Hydroelectric Investigation,Design and Research Institute,Kunming 650041,China  
The paper illustrates the principle of sound wave computer tomography and three inverse algorithms and explains the characteristics of ART,CGLS and LSQR with a typical case of the cement injection quality detection.Actually,by comparing the three algorithms,the authors make use of the straight ray method to built the preliminary model and bend ray tomography and get good effects by back and forth successive substitution.The contrast of the results of CT,single-borehole and cross-borehole probing and hole elasticity modulus does not only show that they fit quite well,but also shows that CT is more visual,delicate and exact than the single-borehole and cross-borehole probing in the cement injection quality test and the other engineering exploring,and has an irreplaceable advantage.
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