Model Study of Side Slope Riprap

by A. F. Ahmed, Hydraulics and Sediment Research, Inst, Egypt,



Document Type: Proceeding Paper

Part of: Sediment Transport Modeling

Abstract:

Laboratory experiments were conducted in 10-m long channels having 1.5 H : 1 V side slopes protected with a 20.7-mm diameter rock layer 1.5 diameters thick. Four models were tested. In the first three models, increasing the discharges up to the maximum pumping capacity did not produce anymore than minor rock displacement, although failure was predicted by all of seven applied methods taken from published research papers. In the last model where the bed was increased, failure did occur and the mode of failure was assessed. A sensitivity analysis of the design methods with safety factor is made which indicated that the protective layer was much more stable than many methods predict. The design methods of the California Highway Department and A.G. Anderson et al. which do not employ safety factor gave results better than that of the safety factor methods.

Subject Headings: Failure analysis | Safety | Riprap | Failure modes | Sensitivity analysis | Rocks | Soil analysis

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