Table 3: The classification and the normalization of the evaluation index.

Evaluation index Grade
grade I gradeII gradeIII gradeIV grade V
characteristics of 3D geomat Thickness of the geomat B11 (mm)
Tensile strength B12 (KN/m)
Soil Nails Spacing B13 (m)		 0.95-1
0.95-1
0.95-1		 0.75-0.95
0.65-0.95
0.65-0.95		 0.5-0.75
0.35-0.65
0.35-0.65		 0.25-0.5
0.05-0.35
0.05-0.35		 0-0.25
0-0.05
0-0.05
The characteristics of soil Cohesion of soil B21 ( kPa )
Internal friction angle B22 (°)
Bulk density B23 (KN/m3)
Permeability coefficient B24 (cm/s)
Compactness B25 (%)
Ratio of pore pressure B26 		0.875-1
0.8-1
0.95-1
0.95-1
0.8-1
0.8-1		 0.625-0.875
0.6-0.8
0.65-0.95
0.65-0.95
0.6-0.8
0.6-0.8		 0.25-0.625
0.4-0.6
0.35-0.65
0.35-0.65
0.4-0.6
0.4-0.6		 0.125-0.25
0.2-0.4
0.05-0.35
0.05-0.35
0.2-0.4
0.2-0.4		 0-0.125
0-0.2
0-0.05
0-0.05
0-0.2
0-0.2
The characteristics of slope Slope angel B31 (°)
Slope length B32 (m)
Lithology B33 		0.9-1
0.9-1
0.8-1		 0.58-0.9
0.7-0.9
0.6-0.8		 0.26-0.58
0.4-0.7
0.4-0.6		 0.1-0.26
0.1-0.4
0.2-0.4		 0-0.1
0-0.1
0-0.2
The characteristics of vegetation Vegetation coverage B41 (%)
Root development B42
Planting suitability B43 		0.95-1
0.8-1
0.8-1		 0.65-0.95
0.6-0.8
0.6-0.8		 0.35-0.65
0.4-0.6
0.4-0.6		 0.05-0.35
0.2-0.4
0.2-0.4		 0-0.05
0-0.2
0-0.2
The characteristics of rainfall Rainfall intensity B51 (mm/h)
Rainfall duration B52 (d)
Daily rainfall capacity B53 (d)		 0.95-1
0.95-1
0.95-1		 0.9-0.95
0.82-0.95
0.81-0.0.95		 0.5-0.9
0.44-0.82
0.6-0.81		 0.05-0.5
0.05-0.44
0.05--0.6		 0-0.05
0-0.05
0-0.05
Construction and maintenance Construction technique B61
Maintenance condition B62
Maintenance time B63 (d)		 0.8-1
0.8-1
0.95-1		 0.6-0.8
0.6-0.8
0.65-0.95		 0.4-0.6
0.4-0.6
0.35-0.65		 0.2-0.4
0.2-0.4
0.05-0.35		 0-0.2
0-0.2
0-0.05
Environment Temperature B71 (°C)
Humidity B72(%)
PH value B73 		0.8-1
0.95-1
0.8-1		 0.6-0.8
0.65-0.95
0.6-0.8		 0.4-0.6
0.35-0.65
0.4-0.6		 0.2-0.4
0.05-0.35
0.2-0.4		 0-0.2
0-0.05
0-0.2