By N. Simons, B. Menzies, M. Matthews
A brief direction in geotechnical web site research is the 3rd quantity within the renowned and authoritative 'Short path' sequence. This ebook specializes in the elemental ideas of geotechnical website research - specifically the making plans of the research. This vital e-book is illustrated all through with 23 case reports, seven of that are specified examples of top perform. a few points of soil mechanics are defined utilizing 'hand written' brief path Notes.
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Extra info for A Short Course in Geotechnical Site Investigation
Consideration should then be given to obtaining large-diameter high-quality samples, for example 250mm in diameter, which could then be tested in large hydraulic oedometers to obtain more realistic measurements of cv , the coefficient of consolidation. In situ permeability tests could be carried out to obtain more reliable values of the coefficient of permeability but it should be noted that only a limited stress range is possible. No indication would be given of a possible significant reduction in permeability with increasing stress level as the height of the embankment increases.
It was therefore decided to carry out field pumping tests to determine whether, by pumping from deep holes, a lowering of the water pressure under the clay deposit could be achieved. Such a reduction, particularly if sand drains could be installed to penetrate into an underlying permeable layer, would lead to significant increases in the magnitude and rate of consolidation settlement of the clay layer. By terminating such pumping immediately before the runway was constructed, it was hoped that subsequent settlements would be reduced.
Observations were made of the pore water pressures set by driving the mandrels necessary for the construction of the sand drains . The pore water pressures developed approached the total vertical stress in the ground so that the effective vertical stress was very small immediately after sand drain installation. There was concern for the stability of the side slopes so the undrained shear strength of the soft clay in the close proximity of the drains was checked using in situ vane tests. Only a very small reduction in undrained shear strength was recorded and it followed that the high pore water pressures observed because of the installation of the drains was primarily due to increases in the total lateral stresses in the ground as the clay was displaced laterally by driving the mandrels.