Graduate Thesis Or Dissertation
 

Evaluation of fabric reinforcement of the roadway structure

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fj236524t

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  • An evaluation of fabric reinforcement of the roadway structure is made. The study includes a parametric analy sis using layered elastic theory and a series of large scale model tests. The parametric. study analyzes the stresses and strains of roadway structures with a fabric layer between tna surface layer and the soil subgrade and compares them to similar systems without fabric. The results show that some benefit results when the fabric is incorporated with a granular surface. No reinforcement is evident when the fbric is incorporated in paved roadways. The analysis, however, does not clearly delineate the benefits, hence, model test results are presented to provide more quantitative data in the indicated range of greatest benefit. The model tests were performed on a granular roadway structure with and without fabric between the gravel and the soil subgrade. The fabric was a nonwoven, needlepunched polypropylene (Fibretex 400). The tests were performed in a five foot diameter test pit. Repeated loads of magnitude up to 9000 pounds were applied to simulate traffic. Rut depth and recoverable deflections were measured as functions of the number of load applications. The effectiveness of the fabric was evaluated with respect to the rate of rut development. A reasonable correlation was found between rutting and the ratio of the vertical stress on the subgrade to the subgrade strength. Measured deflections were compared with values computed by several theories. A finite element method gave good agreement and therefore, was used to estimate stresses in the fabric. The computed fabric stresses indicated if stress on the subgrade was limited to an acceptable value, the factor of safety with respect to fabric strength would be satisfactory. It is concluded that the common construction fabrics in use today (1977) will not provide significant reinforcement to paved roadways. They may, however, be effective for aggregate surfaced roads on very soft subgrades.
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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file details LavansiriDirek1977.pdf 2017-08-10 公开 下载