Quality Inspection and Analysis of Backfill Grouting for the Second Lining of Hanjiangluhu Tunnel Diversion Project
The quality of backfill grouting with second liner plays a decisive role in the normal operation of hydraulic tunnel.Taking the Hanjiangluhu Tunnel Diversion Project as an example,the quality of the second lining backfill grouting of the tunnel is tested by using the ground penetrating radar method.The results show that the detected data have high resolution and signal-to-noise ratio.The reflected wave of the empty area can be clearly seen on the measured profile of GPR.For the first time,mileage section from 260 to 360,from 1070 to 1160,from 2560 to 2610 of the second lining drilling and blasting section of the tunnel were detected.There are cavitation development in the shield segment from 5370 to 5450 miles and from 5740 to 6420 miles.After supplementary irrigation,the reinspection work is carried out in the empty area.The reinspection results show that there is no abnormal cavitation in the initial inspection area.And the effect of supplementary grouting is ideal.The ground penetrating radar method is reliable and efficient in the non-destructive detection of the quality of the second lining backfill grouting in tunnel,which has the value of popularization and application.
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