Internal erosion vulnerability of core soil due to drought: Case study of three zoned dams

Volume 6, Issue 2, April 2021     |     PP. 15-36      |     PDF (1925 K)    |     Pub. Date: December 8, 2021
DOI: 10.54647/cebc56065    89 Downloads     5281 Views  

Author(s)

Ahmed Jalil, LOMC UMR 6294 CNRS-University of Le Havre Normandie, Department of civil Engineering, 53 rue de Prony 76600 Le Havre, France; Laboratory of Materials and Environment Engineering, University of Ibn Tofail, B.P 242, Kenitra, Morocco
Ahmed Benamar, LOMC UMR 6294 CNRS-University of Le Havre Normandie, Department of civil Engineering, 53 rue de Prony 76600 Le Havre, France.
Mohamed Ebn Touhami, Laboratory of Materials and Environment Engineering, University of Ibn Tofail, B.P 242, Kenitra, Morocco

Abstract
Very long dry seasons due to high temperature and decrease of rainfall rate, may threaten the stability of dams and dikes, and make them more sensitive to internal erosion. This vulnerability raises a question of how such hydraulic structures could behave after the degradation of soil properties. This research investigated the susceptibility of three zoned dams in Morocco to internal erosion, particularly after the dam’s core soil was submitted to the drying effect due to the drought, causing desiccation. For this purpose, Hole Erosion Tests (HETs) carried out on core soils collected from the three dams aimed to assess their vulnerability to erosion after desiccation. The materials have been also analyzed in order to assess their suitability to dam construction using the usual engineering guidelines. The erosion results, analyzed through the erosion kinetics and soil resistance classification, showed an initial high resistance to internal erosion of tested soils, but the desiccation makes the core soils more vulnerable to erosion, especially for Mazer dam whose core soil is a lean clay. So, the soil resistance degradation affected in a different way the three core soils. So, a drought phase may threat strongly the core resistance against erosion, leading to serious damage in dam stability when refilling occurs during floods.

Keywords
Internal erosion; Base soil; Drought; Desiccation; Zoned Dam.

Cite this paper
Ahmed Jalil, Ahmed Benamar, Mohamed Ebn Touhami, Internal erosion vulnerability of core soil due to drought: Case study of three zoned dams , SCIREA Journal of Civil Engineering and Building Construction . Volume 6, Issue 2, April 2021 | PP. 15-36. 10.54647/cebc56065

References

[ 1 ] Archer A and Ng CWW (2018) Effects of temperature and relative humidity on a clay embankment: centrifuge modelling. Géotechnique letters 8(2):138-143, https//doi.org/10.1680/jgele.18.00002.
[ 2 ] ASTM D-2487-17 (2017) Standard practice for classification of soils for engineering purposes, unified soil classification system. American Society for Testing and Materials, West Conshohocken.
[ 3 ] Caldeira L (2019) Internal Erosion in Dams: Studies and Rehabilitation. International Journal of Civil Engineering 17(1):457-471, https//doi.org/10.1007/s40999-018-0329-5.
[ 4 ] Chang DS and Zhang LM (2013). Critical hydraulic gradients of internal erosion under complex stress states. J. Geotech. Geo-environ. Eng. 139(9):1454-1467, https//doi.org/10.1061/(ASCE)GT.1943-5606.0000871.
[ 5 ] Coulson, B. (2003). The effect of fine fissuring of clay on the stability of flood defence embankments. MEng Final Year Report, University of Durham.
[ 6 ] Cui YF, Gao YB and Ferber V (2010). Simulating the water content and temperature changes in an experimental embankment using meteorological data. Eng. Geol. 114(1): 456-471.
[ 7 ] Cui YF, Zhou XJ and Guo CX (2017) Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall. Journal of Mountain Science. 14(3):417-431, https//doi.org/10.1007/s11629-016-4303-x
[ 8 ] Dickson A (2004) Investigation into the effect of fine fissuring of clay on the stability of flood defence embankments. MEng Final Year Report, University of Durham.
[ 9 ] Dijkstra TA and Dixon N (2010) Climate change and slope stability in the UK: challenges and approaches. Quarterly Journal of Engineering Geology and Hydrogeology 43(1):371-385, https//doi.org/10.1144/1470-9236/09-036.
[ 10 ] Dyer M, Utili S and Zielinski M (2007) The influence of desiccation fine fissuring on the stability of flood embankments. FRMRC Research Report UR11.
[ 11 ] Hanson GJ and Simon A (2001) Erodibility of cohesive streambeds in the loess area of the midwestern. USA Hydrological Processes 15(1):23-38.
[ 12 ] ICOLD (2013) Internal erosion Processes and Engineering Assessment. In COLD Bulletin on Internal Erosion of Existing Dams, levees and dikes, and their foundations, vol.1, ICOLD, Paris, France.
[ 13 ] Indraratna B, Nguyen VT and Rujikiatkamjorn C (2011) Assessing the Potential of Internal Erosion and Suffusion of Granular Soils. J. Geotech. Geo-environ. Eng. 137(5): 550-554, https//doi.org/10.1061/(ASCE)GT.1943-5606.0000447
[ 14 ] Jalil A, Benamar A and Ebn Touhami M (2019) Erosion - filtration analysis for assessing hydraulic instability of dams in Morocco and global warming effect. 2nd International Conference on EGRWSE, University of Illinois-Chicago. In: Reddy KR, Agnihotri AK, Yukselen-Aksoy Y, Dubey BK and Bansal A (Ed.) Sustainable Environment and Infrastructure. Lecture Notes in Civil Engineering, vol. 90 Springer, Cham. https//doi.org/10.1007/978-3-030-51354-2_41.
[ 15 ] Jalil A, Benamar A and Ebn Touhami M (2020) Assessment of a dam vulnerability to internal erosion due to climate change in Morocco. Innovative Infrastructure Solutions, 5(2), https//doi.org/10.1007/s41062-020-00297-9.
[ 16 ] Jalil A, Benamar A and Ebn Touhami M (2021) Investigation of internal erosion susceptibility of core soil from three dams. Journal of Civil Engineering and Construction 10(2):59-68, https//doi.org/10.32732/jcec.2021.10.2.59
[ 17 ] Lim S (2006) Experimental investigations of erosion in variably saturated clays. Ph-D thesis report, University of New South Wales, Australia.
[ 18 ] MacRobert CJ, Day PW and Luker I (2019) Strength changes during internal erosion of gap-graded soils. Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 172(4):331-343, https://doi.org/10.1680/jgeen.18.00064
[ 19 ] Marnette E, Schuren C, Van de Brink K, Glew ND, Dyer M, Romero EJ (Ed.) and Cui YJ (Ed.) (2005) Further tests on the fissuring of clay fill at thorngumbald food embankment. In Advanced Experimental Unsaturated Soil Mechanics, 501-504.
[ 20 ] Morris PH, Graham J and Williams DJ (1992) Cracking in drying soils. Canadian Geotechnical Journal 29(2):263-277.
[ 21 ] Reddi LN, Lee IM and Bonala MVS (2000) Comparison of Internal and Surface Erosion Using Flow Pump Tests on a Sand-Kaolinite Mixture. Geotechnical Testing Journal, GTJODJ 23(l):116-122.
[ 22 ] Salari M, Akhtarpour A and Ekramifard A (2018) Hydraulic fracturing: a main cause of initiating internal erosion in a high earth-rock fill dam. International Journal of Geotechnical Engineering 15(2):207-219, https//doi.org/10.1080/19386362.2018.1500122.
[ 23 ] Sherard JL (1953) Influence of soil properties and construction methods on the performance of homogeneous earth. U.S. Dept. of the Interior, Office of Reclamation, Design and Construction Division.
[ 24 ] Wan CF and Fell R (2002) Investigation of internal erosion and piping of soils in embankment dams by the slot erosion test and the hole erosion test. The Univ. of New South Wales, Sydney, Australia, UNICIV Rep. R-412.
[ 25 ] Wilson GV, Periketi RK, Fox GA, Dabney SM, Shields FD and Cullum RF (2007) Soil properties controlling seepage erosion contributions to streambank failure. Earth Surf. Process. Landforms 32(1):447-459, https://doi.org/10.1002/esp.1405
[ 26 ] Zeng H, Tang Cs, Cheng Q, Inyang HI, Rong Dz, Lin L and Shi B (2019) Coupling effects of interfacial friction and layer thickness on soil desiccation cracking behavior. Eng. Geol. 260(1):105-220, https://doi:10.1016/j.enggeo.2019.105220.