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Engineering Geology

Engineering Geology - geomuseu

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Chapter 5<br />

Figure 5.2<br />

Particle size distribution of Missouri River Basin loess.<br />

Table 5.10. Some geotechnical properties of loess soils<br />

Shaansi Province, China* Lanzhow Czechos- South<br />

Sandy Clayey Province, lovakia, Polish<br />

Property loess loess China + near Prague † Uplands **<br />

Natural moisture 9–13 13–20 11–10 21 3–26<br />

content (%)<br />

Specific gravity 2.66–2.7<br />

Bulk density (Mg m -3 ) 1.59–1.68 1.4–1.85 1.54–2.12<br />

Dry density (Mg m -3 ) 1.4–1.5 1.46–1.73<br />

Void ratio 0.8–0.92 0.76–1.11 1.05<br />

Porosity (%) 44–50 35–46<br />

Grain-size<br />

distribution (%)<br />

Sand 20.5–35.2 12–15 20–24<br />

Silt 54.8–69.0 64–70 57–65<br />

Clay 8.0–15.5 17–24 16–21<br />

Plastic limit (%) 10–14 20<br />

Liquid limit (%) 26–28 30–31 27–30 36<br />

Plasticity index (%) 8–10 11–12 10–14 16<br />

Activity 1.32<br />

Coefficient of 0.007– 0.003– 0.006–0.011 0.0002–<br />

collapsibility 0.016 0.023 0.06<br />

Angle of friction 7–36∞<br />

*From Lin and Wang (1988).<br />

+<br />

From Tan (1988).<br />

†<br />

From Feda (1988).<br />

**From Grabowska-Olszewska (1988).<br />

215

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