Stability of Rock Protection on Slopes
Publication: Journal of Hydraulic Engineering
Volume 113, Issue 7
Abstract
The stability of rock protection on slopes attacked by a flow requires two conditions. The first is the resistance to sliding that is provided if the ratio of tangential forces to normal forces on one or several rock layers is less than the tangent of the angle of friction of the layers on their support. The second is the resistance to wrenching of the surface layer blocks and is covered by equations derived from the Shields criteria. This paper proposes a new approach to two factors in the analysis, namely: (1) For downslope flow the hydrostatic pressure gradient is not vertical but normal to the slope, and thus existing equations expressing the effect of slope on the threshold shear stress are modified; and (2) a condition of stability that involves the bearing angle of a surface‐layer block thrusting on neighboring stable blocks that is wider than the commonly used angle of repose.
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References
1.
Lane, E. W. (1953). “Design of stable channels.” Transactions, ASCE, 120, 1234–1260.
2.
Olivier, H. (1967). “Through and overflow rockfill dam—New design techniques.” Proc., Inst. Civ. Engr., 433–471.
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4.
Stevens, M. A., and Simons, D. B. (1971). “Stability analysis for coarse granular material on slopes.” River mechanics, Vol. 1, published by Msieh Wen Shen, Ed., Fort Collins, Colo., 17‐1, to 17–27.
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Published In
Journal of Hydraulic Engineering
Volume 113 • Issue 7 • July 1987
Pages: 879 - 891
Copyright
Copyright © 1987 ASCE.
History
Published online: Jul 1, 1987
Published in print: Jul 1987
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