Experimental study of the basal excitation and saturation degree effect on the pore pressure underneath an earth dam
DOI:
https://doi.org/10.4067/s0718-28132018000200053Keywords:
earth dam, pore pressure, degree of saturation, excitation frequency, seepageAbstract
The pore pressure variation and the degree of saturation in a transient regime under an earth dam structure containing liquid are investigated, when subjected to basal dynamic excitations. A scaled physical model (1:200) of an earth dam is built. Frequency ranges between 3 and 10 Hz, in the vertical and the horizontal direction are used. Sine, cosine and triangular functions are used to represent the basal excitation of the structure. The experimental control process is carried out with the continuous measurement of the pore pressure along with a general hydrological balance, which allows controlling not only the infiltration capacity of the system but also the internal storage of water and effluent flow. Results of pore pressure represent piezometric level magnitudes. It was found that larger pore pressure values occur with the increase of the medium degree of saturation and low excitation frequencies. Also permanent changes in pore pressure due to surcharges and suction produced in the dam-foundation soil interface are observed, as a consequence of the imposed ground excitations.
References
Campaña, J., Valenzuela, L. and Bard, E. (2010). Seismic response of the Convento Viejo earth dam during the February 27th 2010 Chile earthquake. Obras y Proyectos 8, 37-46.
Custodio, E. y Llamas, M.R. (2001). Hidrología subterránea. Segunda edición, vol. I, ediciones Omega, Barcelona.
Figueroa, A., Solans, D., Gonzalez, C. y Campaña, J. (2017). Comportamiento sísmico de presas de relaves construidas aguas abajo y línea central. Obras y Proyectos 21, 30-37. https://doi.org/10.4067/S0718-28132017000100004
Kissin, I.G., Belikov, V.M. and Ishankuliev, G.A. (1996). Short-term groundwater level variations in a seismic region as an indicator of the geodynamic regime. Tectonophysics 265(3-4), 313-326. https://doi.org/10.1016/S0040-1951(96)00050-9
Koizumi, N., Kano, Y., Kitagawa, Y, Sato, T., Takahashi, M., Nishimura, S. and Nishida, R. (1996). Groundwater anomalies associated with the 1995 Hyogo-ken Nanbu earthquake. Journal of Physics of the Earth 44(4), 373-380. https://doi.org/10.4294/jpe1952.44.373
Martínez, M. (2010). Influencias de los eventos sísmicos en las aguas subterráneas. Tierra y Tecnología 37, 3-10.
Pastén, M. (2016). Estudio experimental de la infiltración en un tranque de relaves sometido a una excitación dinámica basal. Tesis de título de Ingeniero Civil, Universidad Católica del Norte, Antofagasta, Chile.
Roeloffs, E.A. (1998). Persistent water level changes in a well near Parkfield, California, due to local and distant earthquakes. Journal of Geophysical Research: Solid Earth 103(B1), 869-889. https://doi.org/10.1029/97JB02335
Rojstaczer, S. and Wolf, S. (1991). Hydrologic changes associated with the earthquake in The San Lorenzo and Pescadero drainage basins. Open file report 91-567, US Geological Survey, Menlo Park, California, 51-64. https://doi.org/10.3133/ofr91567
SEEP/W (2012). Seepage modeling with SEEP/W. An engineering methodology. July 2012 Edition. GEO-SLOPE International Ltd. Calgary, Canada.
Shibata, T. and Akita, F. (2001). Precursory changes in well water level prior to the March, 2000 eruption of Usu Volcano, Japan. Geophysical Research Letters 28(9), 1799-1802. https://doi.org/10.1029/2000GL012467
Sibson, R.H., Moore, J.M.M. and Rankin, A.H. (1975). Seismic pumping - a hydrothermal fluid transport mechanism. Journal of the Geological Society 131(6), 653-659. https://doi.org/10.1144/gsjgs.131.6.0653
Sinaba, B., Becker, B., Klauder, W., Salazar, I. and Schüttrumph, H. (2013). On the proceeding of a saturation front under ponded conditions. Obras y Proyectos 13, 31-39. https://doi.org/10.4067/S0718-28132013000100003
Valenzuela, L. (2016). Design, construction, operation and the effect of fines content and permeability on the seismic performance of tailings sand dams in Chile. Obras y Proyectos 19, 6-22. https://doi.org/10.4067/S0718-28132016000100001
Valenzuela, L., Campaña, J., Bard, E. and Figueroa, A. (2016). High sand tailings dams: main challenges. Obras y Proyectos 20, 17-29. https://doi.org/10.4067/S0718-28132016000200002
Downloads
Published
Issue
Section
License
Copyright (c) 2018 Universidad Católica de la Santísima Concepción
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
