Stiffness Determination of Backfill-Rock Interface to Numerically Investigate Backfill Stress Distributions in Mine Stopes

Table 2

Numerical simulation programs for stresses analyses in backfilled stopes.

Cases	Mining methods	Interface stiffness		Stress plotting methods	Filling layers
		Normal stiffness kn (Pa/m)	Shear stiffness ks (Pa/m)
Case 1-0	Open stoping with subsequent backfill	2.02 × 10^10	2.02 × 10^10	Method1: Plot stresses along vertical central line (VCL) after filling whole stope height	10
Case 1-1		VAR	2.02 × 10^10
Case 1-2		2.02 × 10^10	VAR
Case 1-3 (Proposed)		1.25 × 10^9	5.8 × 10^8
Case 2-0	Upward cut and fill mining	2.02 × 10^10	2.02 × 10^10	Method2: Monitor stresses at midpoint of stope bottom (MPSB) after filling each layer	20
Case 2-1		VAR	2.02 × 10^10
Case 2-2		2.02 × 10^10	VAR
Case 2-3 (Proposed)		1.25 × 10^9	5.8 × 10^8

Note. VAR means variable values.