Table 1 Classification of the water plugging rate.
Grading | Water shutoff rate | Plugging condition |
|---|---|---|
Excellent | ≥ 90% | The grouting effect is very considerable, almost completely blocking groundwater seepage, and the engineering goals have been largely achieved |
Good | 70% ~ 90% | The grouting effect is good, considerably reducing groundwater seepage, but a small amount of water may nonetheless penetrate |
Fair | 50% ~ 70% | The grouting effect is average, with seepage being controlled to a certain extent, but a considerable amount of water still seeps through |
Poor | 30 − 50% | The grouting effect is poor, with seepage control not meeting expectations, requiring further engineering measures |
Failure | < 30% | The grouting effect is insignificant, with seepage hardly being effectively controlled, necessitating a redesign and re-execution of the engineering work |
