Applied geophysical techniques to evaluate earth dams and foundations

Jose L. Llopis; Michael K. Sharp; Dwain K. Butler; Donald E. Yule

doi:10.1117/12.209402

12 May 1995 Applied geophysical techniques to evaluate earth dams and foundations

Jose L. Llopis, Michael K. Sharp, Dwain K. Butler, Donald E. Yule

Proceedings Volume 2457, Nondestructive Evaluation of Aging Structures and Dams; (1995) https://doi.org/10.1117/12.209402
Event: Nondestructive Evaluation of Aging Infrastructure, 1995, Oakland, CA, United States

Abstract

Mill Creek Dam, near Walla Walla, Washington has experienced anomalous seepage since its first filling in 1941. Various attempts to abate and control the seepage, including construction of a concrete wall, have not been completely successful. Construction of the cutoff wall reduced the seepage by about 30 percent, from 33 cubic feet per second to 22 cubic feet per second, and downstream saturated farmland was reduced by 56 percent. However, there are indications of increased seepage pressures in a conglomerate formation in the right abutment. A comprehensive, integrated geophysics investigation of the right abutment area of the dam was conducted to detect and map anomalous conditions and assist in the evaluation of remedial measures. The geophysics program consisted of microgravity, ground penetrating radar, seismic reflection, electromagnetic conductivity, and electrical resistivity surveying. Results of the program indicate anomalous conditions extending from the reservoir area through the right abutment. The aspects of the program planning leading to technique selection and field procedures are emphasized, as well as the role of different geophysical techniques in defining the nature of anomalous condition.

Citation Download Citation

Jose L. Llopis, Michael K. Sharp, Dwain K. Butler, and Donald E. Yule "Applied geophysical techniques to evaluate earth dams and foundations", Proc. SPIE 2457, Nondestructive Evaluation of Aging Structures and Dams, (12 May 1995); https://doi.org/10.1117/12.209402

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