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Proceedings Paper

Crosshole seismic methods to assess the seismic stability of earthen dams
Author(s): Jose L. Llopis; Robert F. Ballard Jr.
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Paper Abstract

An in situ geophysical investigation consisting of crosshole and downhole shear wave (S-wave) and surface vibratory tests was performed at Sardis Dam, located on the Tallahatchie River in northwest Mississippi. Tests were conducted in a pile test section at the downstream toe of the dam. The purpose of the investigation was to determine changes in S-wave velocities, which are related to soil strength, in the test section due to pile driving activities. Comparison tests were conducted three times: prior to driving the piles, immediately after, and three months after the piles had been driven. The S-wave crosshole and surface vibratory tests indicated a significant velocity increase, averaging more than 20 percent, due to the driving of piles in the test section. Of the geophysical tests conducted, crosshole testing was the most sensitive in denoting velocity changes. The downhole S-wave test did not detect any significant velocity increases. The scope of this paper is limited to results of crosshole testing.

Paper Details

Date Published: 12 May 1995
PDF: 10 pages
Proc. SPIE 2457, Nondestructive Evaluation of Aging Structures and Dams, (12 May 1995); doi: 10.1117/12.209382
Show Author Affiliations
Jose L. Llopis, U.S. Army Corps of Engineers Waterways Experiment Station (United States)
Robert F. Ballard Jr., U.S. Army Corps of Engineers Waterways Experiment Station (United States)

Published in SPIE Proceedings Vol. 2457:
Nondestructive Evaluation of Aging Structures and Dams
Soheil Nazarian; Larry D. Olson, Editor(s)

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