Determining Soil Properties by Electric Cone Penetrometer

by Jay A. Auxt, Hogentogler & Co, Gaithersburg, MD, USA,
Thomas A. Nolan, Jr., Hogentogler & Co, Gaithersburg, MD, USA,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract:

Gravel island construction is one primary means of establishing permanent locations for oil wells, building foundations and road beds in the arctic. The gravel provides a natural insulation for the permafrost, thus protecting against severe erosion. However, construction of gravel islands is expensive; therefore, accurate soil tests are a necessity to avoid over or under design of the foundation. This requirement for accurate design data has made the Electric Cone Penetrometer a cost effective tool in arctic exploration. Recent publications have provided interpretation of cone data in such areas as stratigraphy, sheer strength, modulus, compressibility, consolidation, and stress history of soils determined by electric cone data. In the winter of 1984 Harding Lawson Associates utilized a Hogentogler & Company Electric Cone and Data Acquisition System to accomplish over 1050 m (3500 ft. ) of data in twenty-two 12-hour days in the Prudhoe Bay area. The equipment, mobilization, protection from cold and wind, access to sea floor, protection from buckling, and data acquisition and transfer are discussed.

Subject Headings: Conical bodies | Soil properties | Gravels | Electrical equipment | Penetration tests | Measuring instruments | Islands | Arctic

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