Introductory soil mechanics and foundations / G.B. Sowers, G.F. Sowers.

Soil Science (Impact Factor: 1.05). 10/1951; DOI:10.1097/00010694-195111000-00014
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    ABSTRACT: It has been proposed that correlation equations derived using empirical methods can be used to estimate compression indexes and can be easily calculated using soil parameters obtained through simple experiments when the number of consolidation tests is small or the dispersion is wide. However, most empirical equations are developed without accurate verification of the suggested regression model using normality test; even the empirical equations based on the data from a specific area are not verified. Therefore, in this study, a new equation using Box-Cox transformation of variables that considers the uncertainty of the sediment is used to minimize the uncertainty in test data.
    Marine Georesources and Geotechnology 01/2011; 29(1):76-94. · 0.38 Impact Factor
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    ABSTRACT: Bottom rack intake is one of the most popular structures for diverting water in steep rivers. The problems of corrosion, deformity, and clogging of the bottom racks in long term inspire a new system of bottom intake in which a filled trench of porous media replaces the bottom racks. Diversion of a specified amount of water through the porous media, when the void space in the granular material is filled with fine sediments in comparison to the bottom racks, requires much larger structure. For the proposed water intake, lower cost of construction and maintenance and higher compatibility with the river morphology are considered as major advantages. This research deals with an experimental model with two-story channel, the lower one is used to convey diverted water through the porous media and the upper one is used to carry the remained flow to downstream. Measurements of the diverted discharge were performed for different rates of flow, grain, and sediment size distributions as well as surface slopes of intake. Results show that despite clogging of the suspended sediments in porous media, using appropriate grain size with a surface slope of the porous media increases the discharge coefficient of system. In comparison to the clear water flow, the diverted discharge reduction induced by clogging is not significant and the efficiency of system in long term with no operation effort is confirmed. An empirical formulation has been proposed based on the concept of Darcy’s law for surface infiltration. The equation is found to be dependent on size ratio, Reynolds number, and hydraulic gradient. The theoretical predictions in comparison with the experimental results have shown a good consistency. KeywordsBottom intake-Porous media-Clogging and sediment transport-Diverted discharge-Infiltration resistance
    Transport in Porous Media 01/2010; 85(3):867-884. · 1.55 Impact Factor
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    ABSTRACT: The properties of clayey alluvial soils in the Erbaa basin on the north bank of the Kelkit River were investigated in the field and in the laboratory. Based on the investigations, soil profiles were constructed and the distribution of clayey soils was identified. Geotechnical properties, mineralogical and chemical compositions of the soils, and their effects on engineering characteristics were established. The dominant minerals are Ca-smectite, kaolinite, and illite, as well as quartz, calcite, and feldspar. Differences in cation exchange capacity values are attributable to the types of clay mineral in the soils and their quantities. The development of heave and swelling pressure in the naturally expansive soils may cause major damage to structures, especially light structures constructed on or in them. The results show that the investigated soils have moderate to high swelling potential. However, because of their high level of consolidation, the soils investigated have high bearing strengths and thus foundation instability problems are not anticipated. This study has special significance for the design and construction of structures, because the Erbaa basin is located near the North Anatolian fault zone.
    International Geology Review 07/2010; February 2002(Vol. 44):179-190. · 3.36 Impact Factor

George B. Sowers