Abstract: Aimed at special questions that there were many cracks in the joint segment of sluice and dam, in which the quality of clay core was disqualification, the method of filling grouting was planned to adopt. The test results showed that the grouting pressure was too low to grout slurry. Based on special circumstances there were two insert-walls in the clay core, red sandstone bam foundation, sluice-wall in the left of spillway etc., the split grouting that pour grouting at the bottom of bore and perfusion around bore, Bai’s method was adopted to treat with these hidden troubles. It showed that the slurry could not be grouted to the middle-inferior part of clay core in routine grouting pressure. By time after time tests, the conditions of split grouting was confirmed, these were the width of split on the top of dam was equal to 4cm (the criterion ordered 3cm) and the resilience proportion was larger than 80 %, the grouting pressures were 0.15-0.23MPa and 0.25-0.40MPa on the middle part and inferior part respectively. The effect of grouting is good. Concretely, inspecting results after grouting 1.5 years, are filling full slurry in dam body, nice concretion and cementation with around the earth of the slurry. The quality of clay core after grouting was improved. Up to the present, over seven years, the joint segment of sluice and dam was all right by time after time floodwaters.

Key words: filling grouting, split grouting, grouting test, grouting pressure, grouting result, clay core, joint segment of sluice and dam