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Title: Use of plastic filter cloth in revetment construction : Potamology Research Project 11
Authors: United States. Mississippi River Commission.
United States. Army. Corps of Engineers. Lower Mississippi Valley Division.
United States. Army. Corps of Engineers. Memphis District.
Fairley, John G.
Easley, Robert T.
Bowman, James H.
Littlejohn, Bobby J.
Keywords: Potamology
Mississippi River
River banks
Bank stabilization
Plastic filter cloth
Revetment construction
Hydraulic structures
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Potamology investigations report ; 21-4.
Description: Potamology Report
Summary: This study is part of a continuing program of general investigations for improving the design of hydraulic structures on the Mississippi River. Some bank failures in the upper bank area occur from loss of subgrade material through the voids of the articulated concrete mattress and riprap upper bank paving. These failures constitute a significant portion of the total costs for making repairs to revetments each year. This points out a pressing need for a filter which is more effective than the standard gravel blanket presently being used. Consequently, an idea was conceived to place a woven plastic cloth in lieu of gravel as a filter in an 800-foot test section of revetment at Island 63 Bar, Mississippi. The plastic cloth was used for the same purpose in repairing scour damage around two county bridges on the St. Francis River. This report presents a description of the construction procedures and results of the experiments, including an evaluation of the filter cloth. The plastic filter cloth has been highly effective in retaining subgrade material under the revetment and bridges and is definitely superior to gravel in this respect. However, a downslope movement of material under the cloth did occur in the revetment test section, resulting in a bulge just above the riprap-mattress connection with a narrow strip of cloth exposed. The cost of the filter cloth would be comparable to that of gravel when considering the repairs that would probably be prevented by the cloth, thus making its use economically feasible. Use of the cloth on a large scale would be dependent upon the development of a mechanical means for placing and holding the cloth on the underwater slope. Based on performance in these experimental installations, the plastic filter cloth is favorably recommended for other projects such as these.
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