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By Menzies, Bruce Keith; Ng, C. W. W.; Simons, N. E

CD comprises scholar versions of the OASYS software program programs 'FREW' and 'Safe'.

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specializes in the 3 significant geotechnical demanding situations of static soil-structure interplay difficulties: Deep foundations - piles, barrettes, Multi-propped deep excavations, and Bored and open face tunnels Read more...

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Jpeg 21 Copyright © ICE Publishing, all rights reserved. g. sandstorms). Most of these transported sediments and salts end up being deposited in the oceans. Continual deposition causes the earliest sediments deposited to experience increased stresses. This causes densification and recrystallisation which increases the strength and decreases the compressibility of the material. In many cases dissolved salts percolating through these sediments will undergo precipitation and cement the particles together.

4 A micrograph of a thin section of an igneous rock showing its crystalline nature. IPR/93/50-C British Geological Survey. # NERC. All rights reserved 33 Copyright © ICE Publishing, all rights reserved. SHORT COURSE IN GEOLOGY FOR CIVIL ENGINEERS Medium – coarse-grained (a) Sill – parallel to layering or bedding – typical rock type = dolerite Dolerite 1 cm (b) Dyke – cuts across layering or bedding – typical rock type = dolerite Fig. 5 Sheet-like igneous intrusions. From Understanding Earth 2nd edition, Frank Press and Raymond Siever.

1998, 1994 by W. H. Freeman and Company. Used with permission So how do igneous rocks differ from one another? This can be summarised as follows: By grain size and texture: . Rate of cooling controls grain size . Slow cooling gives coarse-grained rocks . Rapid cooling gives fine-grained and glassy rocks. By mineral and chemical content: . High silica (Si) content sufficient for quartz to occur within the rock (acid and felsic) . Low silica content insufficient for quartz to occur. g. pyroxene and amphiboles).

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