Correction of Line-Sampling Bias of Rock Discontinuity Orientations Using a Modified Terzaghi Method

Table 1

Data of observed orientations.

Discontinuity	Dip direction/angle (°)	Discontinuity	Dip direction/angle (°)
1	128/73	29	139/66
2	134/70	30	138/65
3	135/70	31	135/70
4	133/71	32	137/72
5	130/75	33	137/77
6	133/71	34	129/74
7	132/74	35	145/78
8	145/72	36	138/70
9	133/76	37	130/69
10	131/67	38	133/71
11	135/74	39	136/70
12	141/72	40	132/70
13	138/75	41	134/72
14	130/69	42	135/77
15	127/73	43	127/69
16	137/80	44	129/73
17	138/73	45	129/71
18	132/78	46	144/72
19	137/73	47	139/71
20	131/73	48	142/75
21	131/69	49	137/76
22	132/71	50	143/74
23	137/69	51	144/71
24	132/79	52	141/79
25	138/74	53	144/73
26	131/77	54	141/75
27	132/73	55	140/80
28	133/78	—	—