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|Title:||Nondestructive tests for the evaluation of railroad track foundations and lime slurry pressure injection stabilization|
|Authors:||United States. Federal Railroad Administration.|
Transportation Systems Center.
Ledbetter, R. (Richard)
|Keywords:||Lime slurry pressure injection|
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-85-2.|
Summary: This report presents the results of a field evaluation of nondestructive test techniques that could be used for assessing the overall condition of a track support system and for determining the improvement in foundation support derived from lime slurry pressure injection. A number of test techniques were evaluated on an artificial railroad embankment and level area at the US Army Engineer Waterways Experiment Station, Vicksburg, Mississippi, and on two test sections on the Rock Island Railroad west of West Memphis, Arkansas. Twelve different geophysical tools and six penetration and strength tests were employed. The test sections were injected with lime slurry. However, only the granular materials present at the test sites were injectable and showed significant strength increases. Based on test sensitivity and repeatability, on the need for geotechnical engineering data, and most importantly on the length of testing time (in order to minimize the impact of testing on normal railroad operations), the following six techniques were selected as best suited for evaluating lime slurry stabilization and overall track support conditions: (a) surface vibratory, (b) surface refraction, (c) mechanical impedance , (d) cone penetration, (e) small aperture CBR, and (f) static or semistatic loading.
|Appears in Collections:||Documents|