Evaluation of Rock Quality of Tunnel Wall Rock Based on Rough Set Theory and Unascertained Measurement Theory

Table 5

Optimal attribute of decision table for evaluation indexes of wall rock quality.

Sample	Rock grade determined by individual evaluation indexes					Actual rock grade
				W	θ
1	III	IV	V	II	V	IV
3	III	IV	I	III	IV	III
4	III	IV	IV	II	III	IV
5	III	I	I	II	III	II
7	III	IV	III	I	III	III
8	III	IV	I	II	IV	III
9	III	IV	IV	I	III	III
10	III	IV	I	II	I	III
11	III	IV	II	I	III	III
13	IV	IV	II	II	III	IV
15	IV	IV	IV	II	I	IV
16	IV	IV	II	II	V	IV
18	IV	IV	IV	I	V	IV
19	IV	IV	IV	I	IV	IV
20	IV	II	V	III	III	III
22	IV	III	III	II	I	III
23	V	IV	V	II	II	V
25	V	V	IV	II	III	V