Impact of In Situ Soil in Soil-Bentonite Cutoff Wall Backfill on Compressibility and Hydraulic Conductivity

Table 2

Proportion of base mixtures for SB backfills.

Sample ID	Type of backfill	Bentonite content in base mixture, BCM (%)	Mass ratio of sand to Nanjing clay by dry weight	Nanjing clay content in base mixture, NCM (%)
CB3.5	SBB^1	3.5	—	0
CB5	SBB	5	—	0
CB6	SBB	6	—	0
CB8	SBB	8	—	0
CB10	SBB	10	—	0
CB12	SBB	12	—	0
CB15	SBB	15	—	0
CB0R0.5	SCBB^2	0	0.5	66.7
CB3.5R6	SCBB	3.5	6	13.8
CB3.5R4	SCBB	3.5	4	19.3
CB3.5R2	SCBB	3.5	2	32.2
CB3.5R1	SCBB	3.5	1	48.3
CB3.5R0.5	SCBB	3.5	0.5	64.3
CB8R6	SCBB	8	6	13.1
CB8R4	SCBB	8	4	18.4
CB8R2	SCBB	8	2	30.7
CB8R1	SCBB	8	1	46.0
CB8R0.5	SCBB	8	0.5	61.3
R0.5	—	0	0.5	66.7

¹SBB: sand-bentonite backfill. ²SCBB: sand-clay-bentonite backfill.