Table 14 Judgement matrix for evaluation objects.

From: Safety risk assessment of weak tunnel construction with rich groundwater using an improved weighting cloud model

(a)

Natural geological condition

Tunnel characteristic parameter

Safety management of construction

  

Natural geological condition

1

3

2

  

Tunnel characteristic parameter

1/3

1

1/2

  

Safety management of construction

1/2

2

1

  

(b)

Classification of surrounding rock (B1)

Groundwater abundance (B2)

Fault width (B3)

Fold width (B4)

Hazardous gas (B5)

Classification of surrounding rock (B1)

1

2

1/2

2

4

Groundwater abundance (B2)

1/2

1

1

1

1/2

Fault width (B3)

3

1

1

1

1/2

Fold width (B4)

1/2

1

1

1

2

Hazardous gas (B5)

1/4

2

2

1/2

1

(c)

Excavation span(B6)

Tunnel burial depth(B7)

Excavation method (B8)

  

Excavation span (B6)

1

4

1/2

  

Tunnel buried depth (B7)

1/4

1

1/4

  

Excavation method(B8)

2

4

1

  

(d)

Support measures (B9)

Safety management (B10)

   

Support measures (B9)

1

3

   

Safety management (B10)

1/3

1

   
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