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Rock classification and hardness grade
Release time:
2022-11-04
Author:
Source:
Rock classification and hardness grade
Rock classification and hardness grade
|
Line Number |
Rock Level |
Degree of firmness |
representative rock |
Hardness coefficient |
|
1 |
I |
The most robust |
The strongest, densest, ductile quartzite, basalt, and various other particularly strong rocks |
f=20 |
|
2 |
II |
very strong |
Very strong granite, quartz porphyry, siliceous schist, stronger quartzite, strongest sandstone and limestone |
f=15 |
|
3 |
III |
Sturdy |
Dense granite, very strong sandstone and limestone, quartz veins, strong conglomerate, very strong iron ore. |
f=10 |
|
4 |
IIIa |
Sturdy |
Solid sandstone, limestone, marble, dolomite, pyrite, unsolid granite |
f=8 |
|
5 |
IV |
relatively firm |
General sandstone, iron ore |
f=6 |
|
6 |
IVa |
relatively firm |
Sandy shale, Shale sandstone |
f=5 |
|
7 |
V |
Medium Sturdy |
Strong argillaceous shale, weak sandstone and limestone, soft gravel |
f=4 |
|
8 |
Va |
Medium Sturdy |
Various unconsolidated shales, dense marl |
f=3 |
|
9 |
VI |
relatively soft |
Weak shale, very soft limestone, chalk, halite, gypsum, anthracite, crushed sandstone and stony soil |
f=2 |
|
10 |
VIa |
relatively soft |
Gravel soil, broken shale, bonded gravel, crushed stone, solid coal, hardened clay |
f=1.5 |
|
11 |
VII |
Soft |
soft dense clay, soft bituminous coal, strong impact soil layer, clayey soil |
f=1 |
|
12 |
VIIa |
Soft |
Soft sandy clay, gravel, loess |
f=0.8 |
|
13 |
VIII |
earthy |
Humus, peat, soft sandy soil, wet sand |
f=0.6 |
|
14 |
IX |
Loose |
Sand, mountain gravel accumulation, fine gravel, loose soil, mined coal |
f=0.5 |
|
15 |
X |
quicksand |
quicksand, marsh soils, loess and other water-bearing soils, extremely soft coal |
f=0.1-0.3 |
Key words:
Rock, solid, sandstone, soil, shale, limestone, comparison, tight, gravel, clay
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