Use of Plastic Filter Cloth in Revetment Construction Potamology Research Project 11.

摘要

Many revetment failures occur each year as a result of the subgrade material being eroded through the voids of the articulated concrete revetment mattress. The process of erosion frequently continues until an extensive scour pocket develops beneath the mattress. This can eventually result in a structural failure in the mattress or progressive movement toward the bank and in either case poses the threat of a bank failure. Limited experiments were first conducted by this District in 1965 in placing woven filter cloth in revetment construction. This study is an extension of those experiments with the objective of determining the feasibility of placing the cloth on the underwater subgrade by attaching the cloth to the mattress squares during casting operations and sinking the unit as a part of the revetment mattress. In general, the experiments showed that the cloth can be satisfactorily placed on the underwater subgrade by bonding the cloth to the bottom of the mattress squares. The use of filter cloth bonded to the mattress squares is recommended for consideration when the requirement for a more effective bank protection at certain locations warrants the additional cost.