Risk Assessment of Shield Tunnel Construction in Karst Strata Based on Fuzzy Analytic Hierarchy Process and Cloud Model

Table 1

The 0.1–0.9 complementary fuzzy scaling method.

Scale	Meaning
0.5	Index i and index j are equally important
0.6	Index i is slightly more important than index j
0.7	Index i is obviously more important than index j
0.8	Index i is significantly more important than index j
0.9	Index i is absolutely more important than index j
0.1, 0.2, 0.3, 0.4, 0.5	Complementarity, inverse comparison of index i with index j