Evaluation index |
Grade |
grade I |
gradeII |
gradeIII |
gradeIV |
grade V |
Characteristics of 3D geomat |
Thickness of the geomat B11 (mm) |
>16 |
14-16 |
12-14 |
10-12 |
8-10 |
Tensile strength B12 (KN/m) |
<1.0 |
1.0-1.5 |
1.5-2.0 |
2.0-2.5 |
>2.5 |
Soil Nails Spacing B13 (m) |
>3.2 |
2.2-3.2 |
1.5-2.2 |
0.8-1.2 |
<0.8 |
The characteristics of soil |
Cohesion of soil B21 (kPa) |
>70.0 |
50.0-70.0 |
20.0-50.0 |
10.0-20.0 |
<10.0 |
Internal friction angle B22 (°) |
>40.0 |
30.0-40.0 |
20.0-30.0 |
10.0-20.0 |
<10.0 |
Bulk density B23 (KN/m3) |
<12.0 |
12.0-16.0 |
16.0-20.0 |
20.0-24.0 |
>24.0 |
Permeability coefficient B24 (cm/s) |
10-8-10-7
|
10-7-10-6
|
10-6-10-5
|
10-5-10-4
|
10-4-10-3
|
Compactness B25 (%) |
95-100 |
90-95 |
85-90 |
80-85 |
75-80 |
Ratio of pore pressure B26
|
0.45-0.5 |
0.4-0.45 |
0.35-0.4 |
0.3-0.35 |
0.25-0.3 |
The characteristics of slope |
Slope angel B31 (°) |
<25 |
25-45 |
45-65 |
65-75 |
>75 |
Slope length B32 (m) |
>50 |
40-50 |
25-40 |
10-25 |
<10 |
Lithology B33
|
very good |
good |
moderate |
bad |
very bad |
The characteristics of vegetation |
Vegetation coverage B41 (%) |
>60 |
45-60 |
30-45 |
10-30 |
<10 |
Root development B42
|
very good |
good |
moderate |
bad |
very bad |
Planting suitability B43
|
very good |
good |
moderate |
poor |
very poor |
The characteristics of rainfall |
Rainfall intensity B51 (mm/h) |
<0.4 |
0.4-1.25 |
1.25-5.8 |
5.8-11.6 |
>11.6 |
Rainfall duration B52 (d) |
<1.0 |
1.0-2.0 |
3.0-5.0 |
6.0-8.0 |
>8.0 |
Daily rainfall capacity B53 (d) |
<10.0 |
10.0-30.0 |
30.0-60.0 |
60.0-140 |
>140.0 |
Construction and maintenance |
Construction technique B61
|
very good |
good |
moderate |
bad |
very bad |
Maintenance condition B62
|
very good |
good |
moderate |
bad |
very bad |
Maintenance time B63 (d) |
>60 |
50-60 |
40-50 |
20-40 |
<20 |
Environment |
Temperature B71 (°C) |
25.0-30.0 |
20.0-25.0, |
10.0-20.0, |
0.0-10.0, |
else |
30.0-35.0 |
35.0-40.0 |
40.0-45.0 |
Humidity B72(%) |
>60 |
50-60 |
40-50 |
30-40 |
<30 |
PH value B73
|
else |
6.0-6.5, |
5.5-6.0, |
5.0-5.5, |
else |
7.5-8.0 |
8.0-8.5 |
8.5-9.0 |