DBPapers
DOI: 10.5593/SGEM2014/B12/S2.110

STUDY ON SLOPE STABILITY FOR SMALL DAMS WITH NON PERMANENT LAKES

M. L. Botos,D. Vingan
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 861-868 pp

ABSTRACT
Small dams with permanent and non-permanent lakes constructed in order to regulate the maximum discharge for small rivers or streams are often avoided by detailed studies in the design phase due the limited founding. Designed in most cases using solution of the homogeneous earth, the cross section is the result of the calculation of upstream and downstream slope stability. These results are influenced by the type of soil used and especially by the seepage. Not only the water level in lake is important, but the position of water table in the dam’s body is the one having the biggest influence. Small dams are characterized by short times in which the water level varies in the lake; steady seepage cannot be obtained for maximum levels in lake. Methods to estimate the main parameters that influence the flow through unsaturated soils, based on size and pore distribution, became available in order to conduct complex studies on small dams. The study was conducted for homogeneous earth small dams, heights smaller than 10 meters, made of different soils, subjected to unsteady seepage as a result of sudden or linear raise of water level in lake, for different operations modes. The study of the impact on slope stability results obtained using classical methods, considering unsteady seepage can highlight whether or not this type of approach necessary.

Keywords: small dams, slope stability, unsteady.