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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>THE DETERMINATION OF IN SITU STRESSES IN ROCK AN CONCRETE</title>
      <link>https://trid.trb.org/View/118124</link>
      <description><![CDATA[A TECHNIQUE IS DESCRIBED WHICH EMPLOYS PHOTOELASTIC COATINGS IN CONJUNCTION WITH STRESS RELIEF PROCEDURES IN ORDER TO DETERMINE THE DIRECTION AND SEPARATE MAGNITUDES OF THE PRINCIPAL SURFACE STRESSES IN ROCK AND CONCRETE SPECIMENS. THE THEORETICAL BASIS OF THE TECHNIQUE IS FULLY DESCRIBED, AND A SURVEY IS GIVEN OF ALTERNATIVE PHOTO- ELASTIC METHODS OF RESIDUAL STRESS DETERMINATION BASED ON THE OVERCORING TECHNIQUE. SOME REPRESENTATIVE DATA CONCERN- ING THE HOLE-DEPTH EFFECT IN ROCK AND CONCRETE ARE GIVEN, AND THE EFFECT OF CONCRETE AGGREGATE SIZE IS DISCUSSED. /RRL/A/]]></description>
      <pubDate>Sun, 15 Aug 2004 01:47:44 GMT</pubDate>
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      <title>THE INFLUENCE OF ROCK ANISOTROPY ON STRESS MEASUREMENTS BY OVERCORING TECHNIQUES</title>
      <link>https://trid.trb.org/View/270751</link>
      <description><![CDATA[This paper is concerned with the influence of rock anisotropy on in-situ stress measurements.  It is limited to stress measurements by overcoring techniques for which strains and displacements are recorded either on the walls of a pilot hole at the end of one or several boreholes or within instrumented solid or hollow inclusions perfectly bonded to the surface of the pilot hole.  The rock is described as homogeneous, continuous, anisotropic and linearly elastic.  The following questions are answered with special emphasis on rocks that can be classed as transversely isotropic or orthotropic: the number of independent measurements obtainable in a single borehole; the number of boreholes required to determine in-situ stress field; the influence of rock anisotropy on these numbers; the influence of the anisotropy type and the error involved be neglecting rock anisotropy.  For the covering abstract of the symposium see TRIS 452576.  (Author/TRRL)]]></description>
      <pubDate>Thu, 31 Jul 1986 00:00:00 GMT</pubDate>
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      <title>IN SITU STRESS MEASUREMENTS IN ANISOTROPIC ROCK</title>
      <link>https://trid.trb.org/View/216651</link>
      <description><![CDATA[The purpose of this paper is to discuss how to account for rock anisotropy when measuring in situ stresses by overcoring with instrumented devices such as the CSIRO hollow inclusion cell or the U.S. Bureau of Mines (USBM) gauge.  The rock is described as an isotropic, a transversely isotropic or an orthotropic material.  The computation of in situ rock stresses with the two devices mentioned above depends on the anisotropic rock character, the degree and type of rock anisotropy, the orientation of the rock anisotropy with respect to the hole in which the devices are located, and, for the CSIRO cell only, dimensionless parameters describing the relative deformability of the rock with respect to the deformability of the cell material.  Using these parameters, the paper addresses the following problems: the effect of the degree and type of rock anisotropy on in situ stress determination; the error involved in neglecting rock anisotropy by assuming isotropy; the error involved in neglecting the geometry and properties of the CSIRO cell by assuming that its strain gauges are positioned directly on the walls of pilot holes, and how this error is affected by the rock anisotropy. (TRRL)]]></description>
      <pubDate>Wed, 31 Jul 1985 00:00:00 GMT</pubDate>
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      <title>CRITICAL EVALUATION OF ROCK BEHAVIOR FOR IN- SITU STRESS DETERMINATION USING OVERCORING METHODS</title>
      <link>https://trid.trb.org/View/204916</link>
      <description><![CDATA[Several significant developments in the interpretation and analysis of in situ stress measurements performed in weak rock using overcoring techniques are described.  These developments include the critical appraisal of overcoring strain data, the determination of stress-strain transformation parameters for cross-anisotropic nonlinear rock, and the formulation of a numerical solution for cross- anisotropic rock.  By suitable comparisons, it is shown that without these refinements meaningful results to the regional stress field could not have been obtained.  The number of the covering abstract of the congress is TRIS no. 385148. (Author/TRRL)]]></description>
      <pubDate>Thu, 28 Jun 1984 00:00:00 GMT</pubDate>
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