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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>PORE WATER PRESSURE AND SHEER STRENGTH</title>
      <link>https://trid.trb.org/View/26623</link>
      <description><![CDATA[In a paper prepared for the Institut Technique du Batiment et des Travaux Publics, M. Z. Kurien, University of Kaynatak, shows how the shearing strength of cohesive soils is closely linked to pore water pressure and recalls the impossibility of estimating the latter analytically for the different conditions of loading, deformation, percentage of air in the interstitial fluid and initial conditions. The determination of the shearing strength thus necessarily evolves in relation to the interstitial pressure and to the apparatus used for measurement. To solve this problem, the author is led to examine the extent to which pore water pressure conditions the behavior of the soil, the instances in which this knowledge is unnecessary, the tests already carried out with a view to eliminating this ever difficult measurement, and finally the attempts made to define the behavior of the soil by means of other parameters, the whole being linked to a theory of failure.]]></description>
      <pubDate>Tue, 10 Jun 1975 00:00:00 GMT</pubDate>
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      <title>PROBLEMS ASSOCIATED WITH EARTH RETAINING STRUCTURES</title>
      <link>https://trid.trb.org/View/26565</link>
      <description><![CDATA[All earth pressure theories put forward hitherto are based on an ideal, dry soil which is endowed with hypothetical, ideal, and uniform properties.  This permits the engineer to solve earth pressure problems only approximately.  By lateral earth pressure is understood the force which is exerted by the soil mass and which acts upon an earth- retaining structure, for instance a retaining wall or bulkhead, or sheet piling.  The magnitude of the lateral earth pressure is known to vary considerably with the displacement of the retaining wall and with the nature of the soil.  The effect of displacement of a retaining wall on the magnitude of the lateral earth pressure is best illustrated by Terzahi's paper on large-scale retaining wall experiments with dry and saturated sand as well as with fine-particled soils.  These experiments revealed that the lateral earth pressure on a retaining wall varies with the lateral displacement of the wall.  Theory, as well as experiments described by Prof. Junikis, shows that the passive earth pressure is always greater than the active earth pressure.]]></description>
      <pubDate>Tue, 08 Apr 1975 00:00:00 GMT</pubDate>
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      <title>RUBBER-TYRED ROLLERS ON COMPACTION OF FOUNDATIONS</title>
      <link>https://trid.trb.org/View/139811</link>
      <description><![CDATA[Whereas the problem of the compaction of road bed layers by means of rollers with rubber tyres is usually approached in an essentially empirical manner, this  report is an attempt to approach the problem rationally, on the basis of known theories and experimental results concerning the behaviour of soils when subjected to static loads. The behaviour of the soil subjected to loads applied by a compactor is analysed by using the so-called 'Mohr' representation for the expression of the stresses and the intrinsic straight lines for those of the properties of the soil. The study of the equilibrium of the soil under load shows that it is reached when the limit conditions are equal to the maximum values of the stresses; in the case of purely cohesive soils, this equilibrium corresponds to and the maximum shear stress. Since the intensity of this maximum shear stress depends only on the pressure of contact and in the extent of the contact area, the author shows how it is possible, by means of graphs, to analyse the influence of the variations of load per wheel and of air pressure in the tyres on the density obtained at different depths. It is possible, in particular, to estimate the maximum depth that can be compacted for a given maximum density, the maximum accessible density for a given load, and so on.]]></description>
      <pubDate>Thu, 09 Jan 1975 00:00:00 GMT</pubDate>
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      <title>CHEMICAL CURTAIN UNDER GREEN PARK, LONDON</title>
      <link>https://trid.trb.org/View/139818</link>
      <description><![CDATA[Difficulties had arisen in the tunneling beneath Green Park, London, because of the thin clay cover between the tunnel crown and the overlying sands and gravels. A layer of these water bearing sands and gravels five feet thick and 350 feet long was injected, by Cementation, with TDM - one of their own chemical grouts - which gives cohesion and strength to the ground above the excavation and controls the inflow of groundwater.]]></description>
      <pubDate>Thu, 09 Jan 1975 00:00:00 GMT</pubDate>
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