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    <title>Transport Research International Documentation (TRID)</title>
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    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>CONSTRUCTION MATERIALS SURVEY, INTERSTATE ROUTE 80, GRANGER JUNCTION TO FLAMING GORGE JUNCTION</title>
      <link>https://trid.trb.org/View/118928</link>
      <description><![CDATA[THIS IS ONE OF A SERIES OF MATERIALS SURVEY REPORTS THAT ARE BEING PREPARED TO COVER THE STATE OF WYOMING. IN THE INITIAL PHASES OF THIS PROJECT, THE MATERIALS SURVEYS ARE CONCENTRATED IN THE AREAS OF INTERSTATE ROUTES. THE MATERIAL SURVEYS ARE PERFORMED BY A STUDY OF REFERENCE LITERATURE AND MAPS, AN INTERPRETATION OF AERIAL PHOTOGRAPHY, FIELD OBSERVATIONS AND INVESTIGATIONS, SAMPLING, LABORATORY TESTS OF THE SAMPLES, AND A SUMMARY COMBINING ALL MAPS AND REPORTS INTO INDIVIDUAL TOWNSHIPS. THIS REPORT PRESENTS THE RESULTS OF THE INVESTIGATION FOR THE AREA THAT LIES 20 MILES ON EACH SIDE OF INTERSTATE 80 BETWEEN GRANGER JUNCTION AND FLAMING GORGE JUNCTION. THE REPORT INCLUDES DESCRIPTIONS OF GEOLOGICAL FORMATIONS, TEST HOLE LOGS AND LABORATORY ANALYSIS OF SAMPLES. THE REPORT ALSO CONTAINS MAPS SHOWING LOCATIONS OF GEOLOGICAL FORM- ATIONS, TEST HOLES, EXISTING PIT SITES, AND POTENTIAL SAND AND GRAVEL DEPOSITS. SPECIFIC CONCLUSIONS CONTAINED IN THIS REPORT WERE THAT WASATCH AND GREEN RIVER FORMATIONS HAVE LITTLE OR NO VALUE AS A SOURCE OF HIGHWAY CONSTRUCTION MATERIAL. A PORTION OF THE BRIDGER FORMATION, SAND DUNES, ALLUVIAL DEPOSITS, SANDSTONE LEDGES HAD SOME VALUE AND THE BISHOP CONGLOMERATE HAD THE MOST VALUE AS A POTENTIAL SOURCE OF HIGHWAY CONSTRUCTION MATERIAL. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:07:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/118928</guid>
    </item>
    <item>
      <title>ENGINEERING CLASSIFICATION OF GEOLOGICAL MATERIALS AND RELATED SOILS-DIVISON ONE</title>
      <link>https://trid.trb.org/View/118917</link>
      <description><![CDATA[A SERIES OF REPORTS ARE BEING PREPARED FOR THE GEOGRAPHIC HIGHWAY DIVISIONS WHICH WILL PROVIDE AN ENGINEERING CLASSIFICATION SYSTEM OF GEOLOGIC MATERIALS AND RELATED SOILS SPECIFICALLY DESIGNED AND DEVOTED TO HIGHWAY PURPOSES. GEOLOGIC MATERIALS HAVE BEEN GROUPED INTO GEOLOGIC UNITS RATHER THAN BY THE NORMAL CATEGORIES OF AGE, FORMATION AND MEMBER. EACH UNIT IS REPRESENTATIVE OF A SPECIFIC AREA WITHIN A COUNTY. THE VARIOUS GEOLOGIC MATERIALS FOUND IN THE UNIT WITH THE ENGINEERING CHARACTERISTICS ARE DESCRIBED. FEATURES, IDENTIFIED WITH THE GEOLOGIC UNITS, SUCH AS THICKNESS, SUSCEPTIBILITY TO LANDSLIDES OR BACKSLOGE FAILURES, THE APPARENT MATERIAL SUITABILITY, SEEPAGE AND RIPPABILITY ARE PRESENTED IN TABULAR FORM. THIS INFORMATION IS BASED ON FIELD OBSERVATIONS AND CONSTRUCTION EXPERIENCE. THE SOILS, CLASSIFIED PEDOLOGICALLY, ASSOCIATED WITH THE GEOLOGIC MATERIALS ARE DESCRIBED, THEIR GEOMORPHIC POSITIONS ARE ILLUSTRATED AND THE SOIL ENGINEERING CHARACTERISTICS ARE TABULATED.]]></description>
      <pubDate>Sun, 15 Aug 2004 02:07:38 GMT</pubDate>
      <guid>https://trid.trb.org/View/118917</guid>
    </item>
    <item>
      <title>NEBRASKA GEOLOGY AND HIGHWAY ENGINEERING PROCEDURES</title>
      <link>https://trid.trb.org/View/118242</link>
      <description><![CDATA[SOILS OF RECENT AGE AND ALSO THE OLDER BEDROCK AS ENCOUNTERED EITHER IN THE SURFACE OR SUBSURFACE INVESTIGATIONS FOR HIGHWAY ENGINEERING IN NEBRASKA ARE DESCRIBED. THE SURFACE AND SUBSURFACE DEPOSITS OF NEBRASKA ARE COMPOSED OF THIN TO MASSIVE UNCONSOLIDATED SEDIMENTS OF RECENT AND PLEISTOCENE AGE, WHICH ARE UNDER-LAIN BY THE OLDER SEDIMENTARY BEDROCK OF TERTIARY, CRETACEOUS, PERMAIN AND PENNSYLVANIAN AGE. PROBLEMS DEALING WITH THESE DIFFERENT GEOLOGICAL FORMATIONS ARE EXAMINED IN THEIR RELATION TO HIGHWAY ENGINEERING DESIGN. PROCEDURES, TECHNIQUES AND EQUIPMENT USED BY THE NEBRASKA HIGHWAY DEPARTMENT IN OBTAINING SAMPLES AND INFORMATION ARE DISCUSSED. WITH THE CONTINUING HIGH COST OF RIGHT-OF-WAY, IT IS BECOMING EVIDENT THAT HIGHWAYS IN THE FUTURE WILL BE ALIGNED ON LESS DESIRABLE SOILS THAN IN THE PAST.]]></description>
      <pubDate>Sun, 15 Aug 2004 01:50:37 GMT</pubDate>
      <guid>https://trid.trb.org/View/118242</guid>
    </item>
    <item>
      <title>THE RECOGNITION OF STRIKE-SLIP FAULT SYSTEMS USING IMAGERY, GRAVITY, AND TOPOGRAPHIC DATA SETS</title>
      <link>https://trid.trb.org/View/359979</link>
      <description><![CDATA[Remote sensing and photogeologic techniques are commonly used in the identificatin of high-angle faulting based on geomorphis evidence. Mapping of strike-slip fault systems can often be enhanced by use of ancillary information such as topographic and gravity data. Because most fault systems are composed of discontinuous fault traces, the deformation patterns between step-overs are consistent indicators of the sense of displacement. Once a strike-slip system is identified with the correct sense of displacement, the geometry of the fault traces can be used to predict areas of basin formation which can be targeted for exploration. The structural characteristics of two major strike-slip systems in the vicinity of Las Vegas--the left-lateral Lake Mead Fault System and the right-lateral Las Vegas Valley Shear Zone--are documented using Landsat imagery, topographic data, and gravity data. The strike-slip systems display discrete, discontinuous fault segments. Interaction of the segments generates regional and local deformation consistent with the kinemaics of strike-slip faulting. The Echo Hills are a push-up feature located within a right-stepover of a left-lateral fault. The Overton Arm is a deep pull-apart basin formed at an extensional stepover. Three distinct basins identified by regional gravity anomaly data are aligned in a right-stepping pattern and are interpreted to have been formed by discontinuous right-stepping segments of the Las Vegas Valley Shear Zone.]]></description>
      <pubDate>Sun, 30 Nov 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/359979</guid>
    </item>
    <item>
      <title>SOFTCOPY PHOTOGRAMMETRIC WORKSTATIONS</title>
      <link>https://trid.trb.org/View/364171</link>
      <description><![CDATA[A summary of softcopy photogrammetric workstations developed by the General Dynamics/Helava Associates, Incorporated (GD/HAI) team during the past ten years is given. The summary starts with the Digital Stereo Comparator/Compiler (DSCC), and also includes the DMA workstation, the Digital Imagery Workstation Suit (DOWS), the Digital Stereo Photogrammetric Workstation (DSPW), the HAI-750, and the HAI-500. Some of the latest efforts have been oriented toward the commercial market place. The key aspects discussed in this paper include the handling of large amounts of imagery, geometric handling of images, elevation extraction, and feature extraction. Approaches and solutions to generic technical problems are highlighted even though only top level descriptions are given.]]></description>
      <pubDate>Fri, 31 Jan 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/364171</guid>
    </item>
    <item>
      <title>CENTRIFUGE MODELLING OF ENVIRONMENTAL PROBLEMS</title>
      <link>https://trid.trb.org/View/476481</link>
      <description><![CDATA[This paper presents work that establishes the geotechnical centrifuge as a powerful tool in investigations of contaminant transportation processes.  A major advantage of this apparatus is its ability to model complex natural and mechanical systems in a controlled laboratory environment.  The scaling laws relevant to centrifuge modeling of contaminant transportation are presented together with a set of examples of work carried out in this area.  These examples illustrate the use of centrifuge testing to investigate contaminant transportation mechanisms in geologic formations, migration of pollutants from waste disposal sites and site remediation strategies.]]></description>
      <pubDate>Tue, 03 Mar 1998 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/476481</guid>
    </item>
    <item>
      <title>WATER SUPPLY REVAMP FOR BOGOTA</title>
      <link>https://trid.trb.org/View/366043</link>
      <description><![CDATA[The Los Rosales Tunnel constitutes the major item of the works to renovate the water supply system to Bogota in Colombia. Geological factors and the tight construction schedule demanded a tunnelling system and equipment specifically designed for this project, which brought it to a successful conclusion.]]></description>
      <pubDate>Sun, 30 Jun 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/366043</guid>
    </item>
    <item>
      <title>PRESPLIT BLASTING PROCEDURES, BULL RUN STEAM PLANT, CLINTON, TENNESSEE</title>
      <link>https://trid.trb.org/View/102491</link>
      <description><![CDATA[GEOLOGIC CONDITIONS AND DESIGN REQUIREMENTS AT THE BULL RUN STEAM PLANT PRESENTLY UNDER CONSTRUCTION BY THE TVA, 13 MILES WEST OF KNOXVILLE, TENN., DICTATED CLOSE CONTROL OF BLASTING PROCEDURES TO OBTAIN SAFE AND ECONOMICAL EXCAVATIONS. VARIOUS TECHNIQUES OF PRESPLIT BLASTING WERE USED IN THE INITIAL STAGE OF ALL MAJOR EXCAVATIONS AND OTHER SPECIALIZED LOADING AND DETONATION PATTERNS WERE USED IN LATER STAGES. HOLE DIAMETERS FOR PRESPLITTING VARIED FROM 1 1/2 TO 9 IN., AND HOLE SPACING RANGED FROM 12 TO 33 IN. ON CENTERS. CHARGES VARIED FROM 1/2 LB TO 175 GR PER LIN FT OF HOLE. FOR BOTH 9-IN. DIAMETER HOLES AND THE 2 3/4-IN. DIAMETER HOLES, THE COST OF MATERIALS WAS LESS THAN $0.10 PSF OF FACE DEVELOPED, HOWEVER, DRILLING AND LABOR COSTS WERE CONSIDERABLY HIGHER FOR DRILLING AND LOADING THE LARGER DIAMETER HOLES. USING THE PRESPLIT METHOD, CLEAN VERTICAL WALLS UP TO 70 FT IN HEIGHT WERE OBTAINED IN MODERATELY DIPPING, THOUGH COMPLEXLY SHEARED AND JOINTED ARGILLACEOUS LIMESTONE. AS THE WORK PROGRESSED, THE PRESPLIT PROGRAM WAS MODIFIED TO MEET THE VARYING GEOLOGIC CONDITIONS AND JOB REQUIREMENTS. THIS WORK WAS DONE ON A PRODUCTION BASIS. THEREFORE, REFINEMENTS AND EXPERIMENTATION NORMALLY CARRIED ON IN A RESEARCH PROGRAM COULD NOT BE FULLY UTILIZED. IT IS FELT, HOWEVER, THAT THE METHODS DEVELOPED ON THIS PROJECT COULD HAVE USEFUL APPLICATIONS ON OTHER MAJOR PROJECTS AND IN HIGHWAY CONSTRUCTION. /AUTHOR/]]></description>
      <pubDate>Mon, 12 Dec 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/102491</guid>
    </item>
    <item>
      <title>A LOADING SYSTEM FOR THE INVESTIGATION OF THE INELASTIC PROPERTIES OF GEOLOGIC MATERIALS</title>
      <link>https://trid.trb.org/View/126831</link>
      <description><![CDATA[THIS PAPER DESCRIBES THE THEORY AND DEVELOPMENT OF A LOADING SYSTEM FOR THE LABORATORY INVESTIGATION OF THE INELASTIC PROPERTIES OF SMALL ROCK AND MINERAL SPECIMENS UNDER A VARIETY OF LOADING MODES, INCLUDING CONSTANT LOAD, INCREMENTIAL LOADING, AND CONSTANT RATE OF LOADING. THE APPLICATION OF BASIC FEEDBACK CONTROL THEORY TO THE DESIGN OF THE CONTROL SYSTEM IS OUTLINED, ALONG WITH DETAILS OF THE CONSTRUCTION AND TESTING OF THE COMPLETED SYSTEM. THE PROBLEM OF OBTAINING UNIFORM LOADING OF CYLINDRICAL TEST SPECIMENS UNDER COMPRESSIVE LOAD IS DISCUSSED, AND DETAILS OF A SPECIAL SPECIMEN LOADING JIG DEVELOPED FOR THIS PURPOSE ARE DESCRIBED. /AUTHOR/]]></description>
      <pubDate>Mon, 05 Sep 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/126831</guid>
    </item>
    <item>
      <title>DISCUSSION' A LOADING SYSTEM FOR THE INVESTIGATION OF THE INELASTIC PROPERTIES OF GEOLOGIC MATERIALS</title>
      <link>https://trid.trb.org/View/126832</link>
      <description><![CDATA[No abstract provided.]]></description>
      <pubDate>Mon, 05 Sep 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/126832</guid>
    </item>
    <item>
      <title>MUD. ORIGIN, TYPE AND PROPERTIES OF SOME GEOLOGIC FORMATIONS</title>
      <link>https://trid.trb.org/View/118102</link>
      <description><![CDATA[THE TYPES OF MUD, GENERALLY OF KAOLINITIC CHARACTER, WHICH ARE FOUND IN OUR REGIONS CAN BE DEFINED AS COMPLEXES WHOSE PHYSICO-MECHANICAL PROPERTIES RESULT FROM AN ASSOCIATION OF THE FOLLOWING PHASES' SANDY /LESS THAN MU/, SILTY /2 TO 20 MU/, PRECOLLOIDAL /0.2 TO 2 MU/, FINE PRECOLLOIDAL /0.2 TO 0.06 MU/, COLLOIDAL /MORE THAN 0.06 MU/, ORGANIC, LIQUID /WATER ABSORBTION/. THE STUDY OF MUD, WITH THE AID OF A PUNCHED CARD CODE, IS AIMED AT ESTABLISHING CORRELATIONS BETWEEN TEST DATA AND INDICATIONS OF GEOTECHNICAL BEHAVIOUR. THE AUTHOR PROPOSES A PLAN OF STUDY BASED ESSENTIALLY ON SEDIMENTOLOGY. IT COMMENCES WITH CORE-DRILLING ACCORDING TO SOUNDINGS AGREED WITH THE ROAD ENGINEER, AND MEASUREMENTS IN SITU OF PH AND IF POSSIBLE RH. THE DETERMINATION OF MOISTURE CONTENT AND ORGANIC MATERIALS, THE IDENTIFICATION AND SEMI-QUANTITATIVE ASSESSMENT OF THE DIFFERENT MINERALS, AND THE USUAL SOIL MECHANICS TESTS, ARE THEN CARRIED OUT IN THE LABORATORY. FOR GRADING MEASUREMENTS THE AUTHOR RECOMMENDS A SEDIMENTOLOGY ANALYSIS EFFECTED BY THE USE OF A SHORTENED ANDREASSEN PIPETTE, WHICH PERMITS MEASUREMENTS DOWN TO 0.06 MU. IT IS ESSENTIAL TO KNOW THE AMOUNT OF THE COLLOIDAL FRACTION WHICH IS OFTEN ALLIED TO THE AMOUNT OF EXPANDING MONTMORILLONITE, AND TO THE ORIGIN OF THYXOTROPIC PHENOMENON. THESE LAST CAN ALSO RESULT FROM THE PRESENCE OF ORGANIC MATERIAL OR FROM DESALINISATION. AT NORMAL SALINITY MUD CLAYS ARE FLOCCULATED. /LCPC/RRL]]></description>
      <pubDate>Wed, 01 Jun 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/118102</guid>
    </item>
    <item>
      <title>CHALK' ORIGIN, NATURE AND TECHNICAL PROPERTIES OF SOME GEOLOGIC FORMATIONS</title>
      <link>https://trid.trb.org/View/124691</link>
      <description><![CDATA[DIFFERENT TYPES OF CHALK ARE DEFINED. THEIR MECHANICAL BEHAVIOR AS ROCK AND AS SOIL ARE STUDIED. CHAPTERS ARE INCLUDED CONCERNING' IMPROVEMENT IN THE UTILIZATION OF CHALK, SELECTING THE TYPE OF CHALK TO BE USED, CHALK STABILIZATION AND THE PROTECTION OF ENGINEERING WORKS AGAINST POSSIBLE LONG TERM EFFECTS OF CHALK EVOLUTION. /LCPC/RRL/]]></description>
      <pubDate>Wed, 01 Jun 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/124691</guid>
    </item>
    <item>
      <title>ROCK SLOPE STABILITY IN THE PRECAMBRIAN METAMORPHIC ROCKS OF THE FRONT RANGE COLORADO</title>
      <link>https://trid.trb.org/View/124649</link>
      <description><![CDATA[THE STUDY INVOLVES DETERMINING WHICH OF MANY POSSIBLY SIGNIFICANT FACTORS ARE, IN PRACTICE, IMPORTANT TO ROCK SLOPE STABILITY, AND THEN DEVELOPING A METHOD FOR THE ENGINEERING DESIGN OF ROCK SLOPES BASED ON THESE FACTORS. THIS PROJECT APPEARS TO BE THE FIRST FIELD STUDY OF ROCK SLOPE STABILITY BASED ON STATISTICAL PROCEDURES. MANY NEW PROBLEMS WERE ENCOUNTERED INCLUDING PLANNING A RANDOM SAMPLING PROCEDURE, MEASURING SLOPE STABILITY, AND QUANTIFICATION OF GEOLOGICAL VARIABLES SUCH AS THE JOINT PATTERN. AT THE PRESENT TIME ALMOST ALL THESE PRELIMINARY PROBLEMS HAVE BEEN OVERCOME, MEASURING PROCEDURES HAVE BEEN FORMULATED AND TESTED IN THE FIELD, AND A DEFINITE PLAN HAS BEEN OUTLINED FOR THE NEXT PHASES OF THE STUDY.]]></description>
      <pubDate>Wed, 25 May 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/124649</guid>
    </item>
    <item>
      <title>LIQUEFACTION HAZARDS AND THEIR EFFECTS ON BURIED PIPELINES. TECHNICAL REPORT</title>
      <link>https://trid.trb.org/View/388776</link>
      <description><![CDATA[The research described in this work involves the evaluation of liquefaction-induced ground movements and their effects on buried pipelines.  The work is divided into three components: 1) review of liquefaction phenomena and associated ground displacements, 2) characterization of liquefaction-induced lateral spreading through observations and measurements of lateral spread deformations during past earthquakes, and 3) parametric study to evaluate buried pipeline response as a function of soil properties and geometric characteristics of lateral spreads.  Case studies of four earthquakes were reviewed in which occurrences of lateral spreading have been reported. These include the 1906 San Francisco, 1964 Alaska, 1971 San Fernando, and 1983 Nihonkai-Chubu earthquakes.  From these case studies, the geologic and morphologic features which control the displacement patterns of lateral spreads are identified.  The damage caused by lateral spreading to lifeline system, and pipeline networks in particular, are examined.  A detailed investigation was performed of ground movements associated with the 1906 San Francisco earthquake.  The direction and magnitude of soil deformations are plotted on the city street system, using as references both historical accounts and photographs of damaged parts of the city after the earthquake.  The pattern of soil movements are related to former topographical features of the region, the location and nature of filled areas, and the location of breaks in the pipeline system.  Displacement patterns typical of those observed during the 1906 San Francisco earthquake were used as a basis for a parametric study of buried pipeline response to lateral spreading.  The soil/pipeline interaction was analyzed by means of a special computer code, UNIPIP, which is capable of evaluating the elasto-plastic behavior of both the soil and the pipeline material well into the post-yield range.  The strains and deformation of a 610-mm-diameter continuous steel pipeline were evaluated as a function of the maximum displacement of a lateral spread, the width over which the maximum displacement develops, and the shear strength and density of the surrounding soil.]]></description>
      <pubDate>Fri, 13 May 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/388776</guid>
    </item>
    <item>
      <title>GUIDE FOR FOUNDATION ENGINEERING IN PENNSYLVANIA KARST. FINAL REPORT</title>
      <link>https://trid.trb.org/View/380827</link>
      <description><![CDATA[This report summarizes the important factors in karst development and presents the typical karst features that may be anticipated in Pennsylvania.  Maps show the areas in the counties where karst conditions may be encountered, and the potential karstic geologic formations are summarized. Procedures are outlined for conducting foundation investigations in karst areas, and appropriate foundation options are discussed relevant to the types of karst conditions present.]]></description>
      <pubDate>Wed, 01 Dec 1993 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/380827</guid>
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