Arch dams

An arch dam, on the other hand, relies on its shape to withstand the pressure of the water behind it. The arch curves back upstream and the force exerted by the water is transferred through the dam into the river valley walls and to the river floor. They are normally constructed in deep gorges where the geological foundations are veiy sound. The United States s Hoover Dam is an example of a concrete arch dam. 

Abstract Accidents of some arch dams show that dam failures are mainly caused by crack or failure of their foundation rocks, which are directly related to water seepage in the rock. This kind of fluid-rock interaction has an important influence on deformation and stress characters of the dam-rock system. In this paper, the stress and flow fields of dams and their foundation rocks are studied as a coupled system, using visco-elastic constitutive models and finite element solution method. The developed models and FEM technique were applied for analysing the continuous displacement of the 13 dam section of the Longyangxia Dam, and the calculated results agree well with the measured ones. 

The above theory and FEM code were applied to analyse the continuous displacements of the 13 dam section of Longyangxia dam from July 1989, as an example. The main part of Longyangxia dam is a gravity arch dam of 396 meters in length, 29.2/80 meters in width (at the top/base), 2610 meters for DCL and 178 meters in height. 

CONCEPT FOR A NEW MONITORING SYSTEM FOR THE ARCH DAM ESCH/SAUER... 

In this paper some ideas are presented and discussed in order to develop a completely new geodetic monitoring system for an existing arch dam. Taking into account the available knowledge on displacements of the structure and critical areas, it was possible to define requirements for the new monitoring system. 

Hatton, T.C. (1922). Deposition of sludges resulting from sewage disposal plants. Trans. ASCE 85 448-450. P Howson, G.W. (1917). Discussion of Multiple-arch dams on Rush Creek, California. Trans. ASCE 81 900-901.(P)... 

Brodie, O.L. (1915). Discussion of The constant-angle arch dam. Trans. ASCE 78 726-727. Brodie,O.L. (1917). Disc.ofReconstructionofthe Stony River Dam. Trans. ASCE% 1041-1044. Jackson, R.W. (2011). Highway under the Hudson Ahistory of the Holland Tunnel. New York. Morrison, C.E., Brodie, O.L. (1910). High masonry dam design. Wiley New York. http //shootingwithhobie.blogspot.ch/2008 04 0 l archive.html P... 

Anonymous (1964). Dexheimer, Wilbur A. Who s who in engineering 9 449. Lewis New York. Dexheimer, W.A. (1938). World s highest multiple arch dams. Bureau of Reclamation Denver. Dexheimer, W.A., ed. (1954). Dams and control works. Bureau of Reclamation. US Government Printing Office Washington DC. 

Jorgensen, L.R. (1917). Multiple-arch dams on Rush Creek, Cal. Trans. ASCE 850-906. Jorgensen, L.R. (1933). Diablo constant angle arch dam. Engineering 136(Jul.07) 2-6. 

Anonymous (1928). Construction of multiple-arch dam in Arizona Lake Pleasant Dam. Engineering News-Record 100(5) 180-183. 

Veltrop, J.A, Wengjer, R.P. (1964). Design of Karadj arch dam. Journal of the Power Division ASCE 90(POl) 1-32. 

Hoover Dam, Colorado, completed In the 1930s but still one of the largest and most Impressive arch dams In the world. 508... 

Well cemented shales, under structurally sound conditions, present few problems at dam sites, though their strength limitations and elastic properties may be factors of importance in the design of concrete dams of appreciable height. They, however, have lower moduli of elasticity and lower shear strength values than concrete and, therefore, are unsatisfactory foundation materials for arch dams. Moreover, if the lamination is horizontal and well developed, then the foundations may offer little shear resistance to the horizontal forces exerted by a dam. A structure keying the dam into such a foundation is then required. 

Arch dam failure is likely to be practically instantaneous and the destruction of the dam may be total. Consequently, unless non-failure can be demonstrated, instantaneous and complete failure of the arch dam with no appreciable accumulation of fragments downstream should be postulated. 

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