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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Effects of Gravels, Cobbles, and Boulders on Drilled Shaft Capacity Cypress Avenue Bridge, Redding, California</title>
      <link>https://trid.trb.org/View/1314221</link>
      <description><![CDATA[Drilled shaft capacity computations are routinely performed by geotechnical professionals using the Alpha and Beta methods outlined in the Federal Highway Administration (FHWA) Publication FHWA-IF-99-025. For cohesionless intermediate geomaterials, the analysis relies heavily upon the Standard Penetration Test sampler blow counts obtained from exploratory borings. In the presence of alluvial gravel, cobble and boulder deposits, such evaluation cannot be reliably performed. This paper presents information obtained from Osterberg Cell load testing of 2.5-meter (98-inch) diameter shafts advanced using the casing oscillator method at the Cypress Avenue Bridge over the Sacramento River in Redding, California. The relationships between side shear transfer, end bearing, and settlement in cobble and boulder rich deposits with various matrix materials and degrees of weathering are demonstrated. The effects of particle dilation in the development of shaft side resistance and zones of higher stress concentration are also discussed. The results of instrumented pile load testing are compared with the results of drilled shaft capacity estimates made using the FHWA methods in an effort to better correlate field performance with analytical methods.]]></description>
      <pubDate>Sat, 19 Jul 2014 12:50:36 GMT</pubDate>
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      <title>Geomaterials 2010</title>
      <link>https://trid.trb.org/View/968428</link>
      <description><![CDATA[This issue contains 8 papers on the subject of geomaterials.  Specific topics discussed include:  red mud-based geopolymers; reclaimed asphalt pavement; recycled concrete materials; use of limestone screenings in roadway construction; unbound aggregate performance; and shakedown limit from multistage permanent deformation tests.]]></description>
      <pubDate>Mon, 18 Oct 2010 14:37:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/968428</guid>
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      <title>Durability of Cement Treated Clay with Air Foam Used in Water Front Structures</title>
      <link>https://trid.trb.org/View/968098</link>
      <description><![CDATA[Durability of cement treated clay with air foam, Super Geo-Material (hereafter referred to as "SGM"), was investigated in this paper. When SGM is used for the backfill of a quay wall or reclamation of a man-made island, this material will be used under water or under the water table. In this case, hydraulic conductivity and water absorption characteristics are important characteristics for the durability of this material. From a series of several permeability tests, air foam in SGM is an impermeable medium if the air volume ratio is less than 25%. However, when the air volume is higher, the air foam makes bleeding channels and the coefficient of permeability dramatically increases. From a series of absorption tests in the laboratory, the absorption properties of SGM under the wet sand condition were different from those under the water condition. The absorption velocity of SGM under the wet sand condition was more than 10 times slower than that under the water condition. And this conclusion was supported by a ten year investigation of a SGM used in the field.]]></description>
      <pubDate>Fri, 15 Oct 2010 08:20:25 GMT</pubDate>
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      <title>Mechanical Behavior of Compacted Geomaterial Changed from the Dredged Soil in Nagoya Port by Mixing with Some Stabilizers</title>
      <link>https://trid.trb.org/View/968150</link>
      <description><![CDATA[To solve the problem of accumulation of huge amount of dredged soil (DS) in Nagoya Port Island, some kinds of stabilizers are mixed with the dredged soil to improve the mechanical properties, and then the treated soils can be used as geomaterial. A series of laboratory tests were carried out to investigate the mechanical behaviors of these soils, and also SYS Cam-clay model was adopted to interpret these behaviors by evolutions of soil skeleton structure theoretically. It is suggested that DS behaves like typical clay, which is difficult to decay structure and easy to lose overconsolidation. Compared with DS, these treated soils are in highly-structured and heavily-overconsolidated state. Moreover, the treated soils change to be new materials with slow rate in both decay of structure and loss of overconsolidation. The strength of treated soils is therefore promoted compared with DS and can be used as a new kind of construction material.]]></description>
      <pubDate>Fri, 15 Oct 2010 08:20:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/968150</guid>
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      <title>Improvement of Thermomechanical Model for Soil and Its FEM Analysis</title>
      <link>https://trid.trb.org/View/934538</link>
      <description><![CDATA[The thermomechanical approach to establishing elastic/plastic constitutive model for geomaterials not only has a tight mathematical structure, but also satisfies the laws of thermo-dynamics automatically and has a rigorous mathematic and physical basis. The isotropic thermomechanical model proposed by Collins (2002, 2005a) is introduced briefly and analyzed in detail. Aiming at its shortage of hardening law, the unified hardening parameter is incorporated into this model. And then, the model is extended to a unified thermomechanical model for soil which can be applied to both clay and sand. The FEM computer program of thermomechanical model and improved unified model are worked out. The adaptability and validity of improved model can be seen from the comparison and analysis of calculated results.]]></description>
      <pubDate>Fri, 24 Sep 2010 07:50:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/934538</guid>
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    <item>
      <title>Comparison of Laboratory and Field Moduli of Compacted Geo-Materials</title>
      <link>https://trid.trb.org/View/934529</link>
      <description><![CDATA[The moduli of compacted geo-materials are estimated in the laboratory or in the field. Laboratory tests are essential to obtain the parameters that affect the behavior of the materials. Field tests, especially nondestructive field tests, are more practical and desirable because they are rapid to perform, and because they test a volume of material in its natural state. Empirical relations between the resilient modulus and the modulus from in-situ test are sometimes used in the preliminary stages of design and planning. Unlike in situ methods, these relations do not take into account the site-dependent variation in material properties. This paper represents an alternative process based on seismic nondestructive testing technology for relating the results from laboratory and field moduli from a number of chemically or mechanically stabilized geo-materials. Attention is also paid to understanding of the results from seismic tests and incorporating them in the existing design methods, specifications and common practices.]]></description>
      <pubDate>Fri, 24 Sep 2010 07:50:30 GMT</pubDate>
      <guid>https://trid.trb.org/View/934529</guid>
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