By N. Simons, B. Menzies, M. Matthews
A brief path in geotechnical web site research is the 3rd quantity within the well known and authoritative 'Short direction' sequence. This e-book specializes in the basic ideas of geotechnical website research - particularly the making plans of the research. This imperative ebook is illustrated all through with 23 case stories, seven of that are precise examples of most sensible perform. a few points of soil mechanics are defined utilizing 'hand written' brief direction Notes.
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Additional resources for A Short Course in Geotechnical Site Investigation
Upper sands, 18 to 21 m thick, and being very loose to loose from ground level to a depth of 7·5m with a Dutch Cone point resistance (CR) varying from 1-5 MPa, and medium dense below a depth of 7·5 m with a CR of 9-15 MPa. The SPT N value was very variable. Upper clays, 3 to 7 m thick, firm to stiff sandy silty clays, with an undrained shear strength (su) varying from 40 to 70 kPa. Lower sands, 15 to 17 m thick, dense to very dense, CR about 20 MPa, N=45. • Lower clays, about 10 m thick, stiff to very stiff silty clays, 170kPa.
In both sets of triaxial tests the axes of the samples were vertical. It can be seen that measurements of undrained shear strength are related to how the measurements are carried out and great care must be exercised when choosing a particular method of test. This point is covered in more detail in Chapter 4. 23 Long term stability The planning of a site investigation for the long term stability of a cutting in stiff fissured clay requires a thorough understanding of the mechanics of the failure of first time slides in such cuttings.
Fourteen boreholes were sunk on the site to explore the soil and to investigate the groundwater conditions. Their locations are shown in Fig. 7 and a generalized borehole log is given in Fig. 8. A detailed visual examination was carried out on a number of open drive samples and a good correlation of the various strata was found between the boreholes. 5l. ,. 98 96 - Medium dense brown, fine to medium sand and gravel - Stiff, dark grey, heavily fissured medium clay, weathered to brown near surface.