Case Study: In Situ Experimental Investigation on Overburden Consolidation Grouting for Columnar Jointed Basalt Dam Foundation

Table 4

Relationship between water-cement ratio (W/C) and water drainage rate.

W/C	0.5 : 1	0.8 : 1	1 : 1	2 : 1	3 : 1
Drainage rate (%)
Before grinding	15.3	22.5	27.2	54.1	81.2
After grinding	1.2	18.4	21.8	50.1	79.8