Read e-book online Applied High-Resolution Geophysical Methods: Offshore PDF

By Peter K Trabant

ISBN-10: 9400964935

ISBN-13: 9789400964938

ISBN-10: 9400964951

ISBN-13: 9789400964952

The self-discipline encompassing using high-resolution geophysics for acquiring geoengineering survey information has advanced quickly over the last a long time to develop into an interdisciplinary topic encompassing the fields of Geophysics, engineering, geology, marine geology, oceanography, and civil engineering. whereas high-resolution geophysical surveys are normally played offshore this day, this has been so simply because the past due Sixties. High-resolution geophysical tools are hired within the offshore surroundings to acquire a entire photograph of the sea-floor mor­ phology and underlying shallow stratigraphy. the aim of the survey equipment is to help within the layout and deploy of bottom-supported buildings equivalent to drilling and construction systems and pipelines. Drilling buildings and pipelines of metal and/or concrete became behemoths with appreciate to their measurement and the complexity in their layout as a way to stand up to, for classes of as much as twenty-five years, an exceptionally harsh atmosphere, together with typhoon waves, powerful currents, volatile sea­ ground stipulations, and nice water depths. it's as a result of paramount value that the geometry and actual homes of the ocean ground be good understood so one can supply an sufficient beginning for the layout lives of such buildings. On land, engineering beginning information frequently might be acquired by way of field of regard inspection and shallow borehole details, yet offshore the presence of the water column areas yes constraints on geoengineering investigations. High-resolution geophysical equipment hired within the acquisition of geoengineering facts offshore are outlined because the use of seismic assets and receivers that function at acoustic frequencies more than a hundred Hz.

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Extra info for Applied High-Resolution Geophysical Methods: Offshore Geoengineering Hazards

Sample text

Marine Geotechnique, An Overview 39 or ability of a sediment sample to allow the passage of fluids may also be determined from the results of the consolidation test. Acoustic Velocities A specially equipped consolidometer (fig. 8) allows the measurement of acoustic velocities through a sediment sample as it is subjected to increasing loads, equivalent to greater depths of burial. Such tests have provided insight to the acoustic nature of marine sediments. Triaxial Compression Testing For detailed tests of marine sediment samples, where critical loading effects must be assessed, samples are tested within the triaxial compression testing device, which allows for very fine control of the environmental stresses applied to the sample up to failure.

JJ) ' ... ·- -·· u to oroc ,..... tu,... IIOCk•ta . s, to kJ' . . __. ··--GQ,......... _ ........ __.. a. __.. _. ___ _ ~ r-----r- -r-r-- . ' I ' ~ .. ---· ~f i i • I . -. ,... ~~~GUG~~-~ ~~--~nwua~=~~~~~~_u~--n-~~-L--~-4 ~ ~~L_ ~ ~c::,~.. 2 Typical geoengineering profile of borehole data. ) 3. Marine Geotechnique, An Overview 29 description could be: dark brown or red silt, containing fragments of shell and organic debris and thin (I mm) sand laminations. The relative strength may also be described in the field on the basis of measurements made by a miniature vane, torvane, or pocket penetrometer.

Between 4 and 7 are borderline cases re .. quiring use of dual symbcls. Limits Not meeting oll gradation requirements for SW c. l. 1. less than 4 Atterburg Iimits below Not meeting oll gradation requirements for GW c. = Labaratory classlflcatlon crlterla Coj Coj ~ ~ ;:: c ~ c.. MH OL ::;: ~ ~ c ~ !!.. 2 ~ 0 ~ :;. " 0: ; 0 10 20 1:- 30 40 50 60 0 10 20 30 I 50 Liquid Iimit 60 70 OH and MH I/V 80 90 100 _LV CHI% Note: Reprinted from PCA Sail Primer (EB007S) by permission of the Portland Cement Association, Skokie, Illinois.

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Applied High-Resolution Geophysical Methods: Offshore Geoengineering Hazards by Peter K Trabant


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