Detection of defects in a grout curtain by geophysical methods

Conclusion The proposed method of detecting local defects in a cutoff curtain has a large radius of investigation and allows testing a 30-m-long section of the curtain during one experiment.Each experiment takes about 4 h. The area of use is limited to an evaluation of the quality of grout curtains constructed below the groundwater level. The method is intended for use together with other existing methods for increasing the details of checking grout curtains.In addition to a qualitative solution of the quality control problem (detection of local defects in the grout curtain), the method makes it possible to obtain a quantitative evaluation of the achieved effect based on solving the problem of the relation between the measured parameter and effect of grouting obtained for a homogeneous (porous) medium.The use of the described geophysical method of checking the quality of grout curtains makes it possible to increase the reliability of their work and to promptly introduce necessary changes into the grouting technology.Translated from Gidrotekhnickeskoe Stroitel'stvo, No. 7, pp. 23–27, July, 1986.