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

Soil Science (Impact Factor: 1.04). 10/1951; DOI: 10.1097/00010694-195111000-00014
Source: OAI

ABSTRACT Incluye índice Incluye bibliografía

  • [Show abstract] [Hide abstract]
    ABSTRACT: Elaborate experiments were performed in a 30 m long, 0.5 m deep and 0.2 m wide laboratory flume to study the process of infiltration of fine sediment into the pores of coarse sediment forming the channel bed material. Different concentrations of suspended load of fine sediment of size 0.064 mm were passed over the channel bed made up of three different types of coarse sediments; two uniform and one nonuniform. The proportion of fine sediment infiltrated into the pores of bed material for each equilibrium concentration of suspended load of fine sediment in the flow was studied during several experimental runs. The proportion of fine sediment within the pores of bed material increased with an increase in the equilibrium concentration of suspended load of fine sediment in the flow. This process continued till the pores within the coarse sediment bed were filled up to the capacity with the fine sediment transported by the flow in suspension. The theoretical value was identified for limit for maximum proportion of fine sediment that can be present within the pores of bed material. On further increase in the concentration of suspended load of fine sediment in the flow, deposition of fine sediment occurs on the surface of the flume bed in the form of ripples of the fine sediment. This condition is defined as 'depositional condition'. Experimental observations on these and related aspects are presented herein.
    International Journal of Sediment Research 06/2013; 28(2):210–219. DOI:10.1016/S1001-6279(13)60032-3 · 0.72 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Bida Basin is located in the central part of Nigeria, trending northwest southeast. Present study is focused on the claystone units of the Maastrichtian Patti and Enagi Formations in southern and northern Bida Basins respectively, to determine the paleoenvironments, geochemical and geotechnical properties and, assess the economic potential of the clay deposits. At Share, towards the middle part of the Enagi Formation section, cream to white claystone beds are interbedded with cross to parallel stratified quartzarenitic sandstones. In the Patti Formation section at Agbaja, white, massive claystone beds are interbedded with herringbone and hummocky cross stratified sandstones. Gross sedimentological features suggest that the associated sandstone facies were deposited in tidal channel to shoreface environments whereas the claystone probably represent a low energy floodplain sub environment. Geochemical data show that the claystone at Share is composed of SiO 2 content ranging from 45.2% to 64.8% (average of 58.1%) while at Agbaja, the values range from 48.5% to 74.7% (average of 63.3%). Al 2 O 3 value for the clay at Share ranges from 20.3% to 37.9% (averaging 26.9%) while, the Agbaja samples is between 15.61% and 34.23% with an average of 24.6%. These indicate that the clays are essentially hydrated siliceous aluminosilicates. Relatively low abundance of MgO and K 2 O (less than 0.30%) indicate lack of expandable clay mineral in the samples. Plastic limit less than 30% indicates that clays are kaolinitic. Average Plastic Index for the Share and Agbaja clays are 24.29 and 17.7% respectively and the shrinkage limit values (average) are 10.05% and 2.66%. The clays compare favourably with the Plastic fire clay of St. Louis and Florida active kaolinite. Their characteristics are quite consistent with other sedimentary kaolin deposits in Nigeria. They also show low heavy metal concentrations and thus may be beneficiated and suitable as raw materials for ceramic, pharmaceuticals and paints.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Enhancing the quality of granular layers is fundamental to optimise the structural performance of the pavements. The objective of this study is to investigate whether previously developed packing theory-based aggregate parameters can evaluate the resilient modulus of unbound granular materials. In this study, 19 differently graded unbound granular materials from two countries (USA and Sweden) were evaluated. This study validated both porosity of primary structure (PS) and contact points per particle (coordination number) as key parameters for evaluating the resilient modulus of unbound granular materials. This study showed that decreasing the PS porosity – higher coordination number – calculated based on the proposed gradation model, yields higher resilient modulus. Good correlation was observed between the proposed packing parameters and resilient modulus of several types of aggregates. The packing theory-based framework successfully recognised granular materials that exhibited poor performance in terms of resilient modulus. Keywords: unbound materials; packing theory; primary structure; porosity; coordination number; resilient modulus
    International Journal of Pavement Engineering 10/2013; 15(8). DOI:10.1080/10298436.2013.857772 · 1.11 Impact Factor