A Copula-Based Method for Estimating Shear Strength Parameters of Rock Mass

Table 1

Results of in situ direct shear tests and rock mass quality indices of the specimens.

Set number	Rock mass quality indices			Shear strength parameters
	RQD/%	RBI			/MPa
1	75.3	17.6	30.5	1.79	1.95
2	89.3	31.5	23.8	1.38	1.98
3	96.8	41.6	38.7	1.17	1.50
4	99.3	31.8	39.7	2.20	2.25
5	96.4	43.4	38.6	1.39	1.80
6	98.1	22.6	26.5	1.60	1.80
7	59.8	8.0	8.1	1.80	2.80
8	56.0	10.3	5.2	1.17	1.20
9	65.9	14.3	8.9	1.23	2.41
10	77.4	13.2	5.2	0.56	3.00
11	67.9	9.0	5.4	1.07	3.25
12	51.8	7.0	4.6	1.15	4.32