Some Useful Numbers on the Engineering Properties of Materials (Geologic and Otherwise)
GEOL 615
Coefficient of sliding friction (m)
For most rocks, m varies between 0.8 and 0.5. A value of 0.60 would be a good number for general use.
Glass on glass 0.4
Rubber on concrete 0.75
Steel on steel 0.55
Angle of internal friction (f)
Rock 30°
Sand 30-40°
Gravel 35°
Silt 34°
Clay 20°
Loose sand 30-35°
Medium sand 40°
Dense sand 35-45°
Gravel with some sand 34-48°
Silt 26-35°
Because the angle of internal friction, f, is typically around 25-35°, the coefficient of internal friction (tanf) is 0.5 to 0.7
Cohesive strength (t0)
Rock 10,000 kPa
Silt 75 kPa
Clay 10-20 kPa
Very soft clay 0- 48 kPa
Soft clay 48-96 kPa
Medium clay 96-192 kPa
Stiff clay 192-384 kPa
Very stiff clay 384-766 kPa
Hard clay >766 kPa
Density (r)
Sandy soil 1800 kg/m3
Gravel soil 2000 kg/m3
Silty soil 2100 kg/m3
Clay soil 1900 kg/m3
Mafic igneous rocks 3000 kg/m3
Felsic igneous rocks 2700 kg/m3
Metamorphic rocks 2700 kg/m3
Sedimentary rocks 2600 kg/m3
Granite 2700 kg/m3
Shale 2500 kg/m3
Limestone 2700 kg/m3
Chalk 2100 kg/m3
Sandstone 2000 kg/m3
Steel 8000 kg/m3
Concrete 1680-3000 kg/m3
Water 1000 kg/m3
Unit weight (g) (recall that g = rg)
"Rock" 26.5 kN/m3
Gravel soil 19 kN/m3
Sandy soil 16 kN/m3
Silty soil 20 kN/m3
Clay soil 18 kN/m3
Water 9.8 kN/m3
Concrete 23 kN/m3
Steel 78 kN/m3
Porosity
Gravel 30-40%
Sand 20-35 %
Silt 35-50 %
Clay 33-60 %
Sand and gravel, mixed 20-35 %
Glacial till 10-20 %
Sandstone 5-30%
Limestone 5-30%
Shale 10-30 %
Fractured igneous rock 10-40%
Granite 0.5-1.5 %
Diabase 0.1-0.5 %
Gabbro 0.1-0.2 %
Basalt 0.1-1.0 %
Gneiss 0.5-1.5 %
Marble 0.5-2 %
Slate 0.1-0.5 %
Quartzite 0.1-0.5 %
Permeability
Well-sorted gravel 10-2 to 1 cm/sec
Well-sorted sands, glacial outwash 10-3 to 10-1 cm/sec
Silty sands, fine sands 10-5 to 10-3 cm/sec
Silt, sandy silts, clayey sands, till 10-6 to 10-4 cm/sec
Clay 10-9 to 10-6 cm/sec
Soil Sensitivity
Insensitive clays <1
Low sensitive clays 1-2
Medium sensitive clays 2-4
Sensitive clays 4-8
Extra sensitive clays 8-16
Quick clay >16
Compressibility (Cc)
Soft clay >0.3
Clay 0.3-0.15
Silty clay 0.15-0.075
Sandy clay <0.075
Poisson's ratio (n)
Sandy Soil 0.25-0.4
Gravel soil 0.15-0.35
Granite 0.1-0.3
Sandstone 0.21-0.38
Shale 0.2-0.4
Limestone 0.18-0.33
Chalk 0.35
Marble 0.06-0.22
Steel 0.3
Young's Modulus (E)
Clay soil 10-200 MPa (soft to stiff)
Sandy soil 10-50 MPa (loose to compact)
Gravel soil 70-170 MPa (loose to compact
Soft clay 1-3 MPa
Hard clay 6-14 MPa
Loose sand 10-28 MPa
Dense sand 35-69 MPa
Granite 10-70 GPa
Sandstone 1-20 GPa
Shale 1-70 GPa
Limestone 15-55 GPa
Marble 50-70 GPa
Steel 200 GPa
Glass 45 GPa
Wood 6,000-15,000 MPa
Bulk modulus (K)
Granite 50 GPa
Shale 10 GPa
Limestone 65 GPa
Chalk 9 GPa
Sandstone 0.7 GPa
Modulus of rigidity (m)
Granite 24 GPa
Shale 1.6 GPa
Limestone 24 GPa
Chalk 3.2 GPa
Sandstone 0.4 GPa
Steel 80 GPa
Wood 4 GPa
Glass 19 GPa
Lithostatic pressure gradient
26.46 MPa/km (for r = 2.70)
Hydrostatic pressure gradient
9.8 MPa/km
Unconfined compressive strength
Granite 100-250 MPa
Basalt 100-300 MPa
Quartzite 150-300 MPa
Sandstone 20-170 MPa
Shale 5-100 MPa
Limestone 30-250 MPa
Marble 35-60 MPa
Slate 100-200 MPa
Quartzite 150-300 MPa
Concrete 14-42 MPa
High strength concrete 70 MPa
Steel 250 MPa
Wood 5 MPa
Field test for compressive strength of soils and rocks
Term Diagnostic features Undrained compressive strength
Very soft soil Exudes between fingers when squeezed <25 kPa
Soft soil Easily indented by fingers 25-50 kPa
Firm soil Indented only by strong finger pressure 50-100 kPa
Stiff soil Indented by thumb pressure 100-200 kPa
Very stiff soil Indented by thumb nail 200-400 kPa
Hard soil Difficult to indent by thumbnail 400-1000 kPa
Very strong rock Very hard rock, requires repeated hammer blows >100 MPa
Strong rock Hand specimen can be broken with single blow 50-100 MPa
Mod. strong rock 5 mm indentations with hammer pick end 12.5-50 MPa
Mod. weak rock Too hard to cut by hand 5-12.5 MPa
Weak rock Crumbles with blows of pick end of hammer 1.25-5 MPa
Shear strength
Granite 14-50 MPa
Diabase 25-60 MPa
Basalt 20-60 MPa
Slate 15-30 MPa
Quartzite 20-60 MPa
Sandstone 8-40 MPa
Shale 3-30 MPa
Limestone 10-50 MPa
Gravel 200-600 kPa
Sand 100-300 kPa
Very soft clay 0-25 kPa
Soft clay 25-50 kPa
Medium clay 50-100 kPa
Stiff clay 100-200 kPa
Very Stiff clay 200-400 kPa
Hard clay >400 kPa
Wood 10 MPa
Concrete 2 MPa
Steel 230 MPa
Tensile strength
Granite 7-25 MPa
Basalt 10-30 MPa
Gneiss 5-20 MPa
Quartzite 10-30 MPa
Sandstone 4-25 MPa
Shale 2-10 MPa
Limestone 5-25 MPa
Marble 15 MPa
Steel 400 MPa
High strength steel 750 MPa
Cast iron 170 MPa
Aluminum 450 MPa
Concrete 5 MPa
Rubber 15 MPa
P-wave velocity
Soil 100-500 m/sec
Glacier ice 3000-4000 m/sec
Clay (dry) 200-1400 m/sec
Clay (wet) 1200-2200 m/sec
Alluvium 3000-5000 m/sec
Water 1450-1500 m/sec
Sand 400-2300 m/sec
Oil 1300 m/sec
Air 320-340 m/sec
Granite 3000-5900 m/sec
Basalt 4500-6500 m/sec
Quartzite 5000-6500 m/sec
Sandstone 1400-4000 m/sec
Shale 1400-3000 m/sec
Limestone 2500-6000 m/sec
Marble 3500-6000 m/sec
Salt 4500 m/sec
S-wave velocity
Clay (dry) 410 m/sec
Clay (saturated) 390 m/sec
Alluvium 1900 m/sec
Water 0 m/sec (because no shear strength)
Oil 0 m/sec (because no shear strength)
Air 0 m/sec (because no shear strength)
Limestone 3100 m/sec
Sandstone 2400 m/sec
Dolomite 3000 m/sec
Shale 2600 m/sec
Granite 3400-3600 m/sec
Dolerite 3500-3600 m/sec
Salt 2700 m/sec
Resistivity
Marble 5 x 107-109 Ohm-m
Mica 1011-1014 Ohm-m
Quartz 1012-1014 Ohm-m
Slate 1-2 x 106 Ohm-m
Petroleum 2 x1014 Ohm-m
Distilled water 5000 Ohm-m
Saltwater 2 ppm 3.4 Ohm-m
Saltwater 10 ppm 0.72 Ohm-m
Saltwater 20 ppm 0.38 Ohm-m
Saltwater 100 ppm 0.09 Ohm-m
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More reference: http://osp.mans.edu.eg/geotechnical/Ch1C.htm
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