Effect of Joint Roughness and Infill Thickness on Shear Characteristics of Rock Mass

Table 3

Relationship between peak shear stress and coupling of joint roughness and infill thickness for unbolted infilled rock joints.

Infill thickness	JRC			Change multiple (from 6–8 to 18–20)
	6–8	12–14	18–20
2.1 mm	4.24 MPa	7.35 MPa	11.17 MPa	2.63
2.6 mm	3.67 MPa	6.38 MPa	10.16 MPa	2.77
3.1 mm	3.15 MPa	5.78 MPa	8.82 MPa	2.80
Change multiple (from 3.1 mm to 2.1 mm)	1.35	1.27	1.27	—