ECPT Investigation of a Slurry Trench Cutoff Wall

by William O. Engemoen, US Bureau of Reclamation, Denver, CO, USA,
Perry J. Hensley, US Bureau of Reclamation, Denver, CO, USA,



Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering

Abstract:

ECPT (electronic cone penetration testing) was used to investigate a soil-bentonite backfilled slurry trench cutoff wall at Calamus Dam in Nebraska, The wall was tested shortly after its completion in order to obtain information on the condition of the backfill and the competency of the cutoff wall. The only problem associated with the cone testing was that surprisingly large deflections of the tip occasionally occurred within the relatively soft trench backfill, making data interpretation more difficult. In general, results of the testing indicated a competent cutoff wall. The most significant finding was the lack of increasing tip resistance with depth, indicating a relatively constant strength throughout the depth of the backfill.

Subject Headings: Penetration tests | Diaphragm walls | Trenches | Backfills | Strength of materials | Material tests | Soil strength | Nebraska | United States

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