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Engineering Geology

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Table 5.33. Some physical properties of chalk from Yorkshire, Norfolk and Kent, England (after Bell et al., 1999)<br />

Yorkshire* Norfolk* Kent***<br />

Lower Middle Upper Lower Melbourn Rock Middle Upper Upper<br />

271<br />

Dry density (Mg m -3 )<br />

Maximum 2.13 (L) 2.30 (M) 2.23 (M) 2.17 (L) 2.23 (M) 1.81 (L) 1.70 (VL) 1.61 (VL)<br />

Minimum 1.85 (L) 1.76 (VL) 1.77 (VL) 1.71 (VL) 2.04 (L) 1.62 (VL) 1.54 (VL) 1.35 (VL)<br />

Mean 2.08 (L) 2.14 (L) 2.06 (L) 1.99 (L) 2.17 (L) 1.76 (VL) 1.61 (VL) 1.44 (VL)<br />

Effective porosity<br />

(%)(Saturation method)<br />

Maximum 30.2 (VH) 35.0 (VH) 36.4 (VH) 34.4 (VH) 27.0 (H) 38.2 (VH) 43.2 (VH) 45.7 (VH)<br />

Minimum 17.2 (H) 16.2 (H) 17.7 (H) 19.9 (H) 16.1 (H) 30.2 (VH) 34.3 (VH) 29.6 (H)<br />

Mean 20.6 (H) 21.8 (H) 23.9 (H) 26.5 (H) 19.8 (H) 34.4 (VH) 39.9 (VH) 41.7 (VH)<br />

Permeability (¥ 10 -9 m s -1 )<br />

Maximum 1.2 2.2 37.0<br />

Minimum 0.3 0.5 13.9<br />

Mean 0.9 1.4 27.7<br />

Dry unconfined<br />

compressive<br />

strength (MPa)**<br />

Maximum 32.7 (MS) 36.4 (MS) 34.0 (MS) 30.5 (MS) 38,3 (MS) 25.1 (MS) 12.7 (MS) 6.2 (MW)<br />

Minimum 19.1 (MS) 25.2 (MS) 18.1 (MS) 14.2 (MS) 22.1 (MS) 7.4 (MW) 6.9 (MW) 4.8 (W)<br />

Mean 26.4 (MS) 30.7 (MS) 25.6 (MS) 21.0 (MS) 29.1 (MS) 13.0 (MS) 9.5 (MW) 5.5 (MW)<br />

Saturated unconfined<br />

compressive strength<br />

(MPa)<br />

Maximum 16.2 20.4 15.9 13.7 17.5 10.3 5.1 2.2<br />

Minimum 8.6 11.7 7.4 6.2 8.9 3.1 2.8 1.4<br />

Mean 13.7 16.8 11.9 10.7 14.3 5.8 3.6 1.7<br />

Continued<br />

Chapter 5

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