Advances in Civil Engineering

Research Article

Stability Assessment of Ground Surface along Tunnels in Karst Terrain Using Improved Fuzzy Comprehensive Evaluation

Table 1

Grading standards for evaluation indices.
Evaluation indexStability level
I1PBK (%)0–1010–3030–5050–100
I2FLC0–0.0420.042–0.1040.104–0.2540.254–0.636
I3TBC (m)20–5010–205–100–5
I4SBC0–2525–5050–7575–100
Uniform structureDouble-layer structure and permeability of the upper layer is lower than that of the lower layerMultilayer structure and permeability of the upper layer is lower than that of the lower layerMultilayer structure and permeability of the upper layer is higher than that of the lower layer
I5GHC0–2525–5050–7575–100
Groundwater runoff condition is poorGroundwater runoff condition is moderateGroundwater runoff condition is goodGroundwater runoff condition is very good
I6DGB (m)10–505–102.5–50–2.5
I7WFI (m)0–33–55–1010–50
I8SFF0–2525–5050–7575–100
No fold or the tunneling area locates in the limb parts of flat and open foldsThe tunneling area locates in the limb parts of steep and tight foldsThe tunneling area locates in the hinge parts of flat and open foldsThe tunneling area locates in the hinge parts of steep and tight folds
I9DPT (m)50–10030–5010–300–10
I10GCE (m)0–22–55–1010–50