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Title: AMPERAGE AND TREATMENT TIME MONITORING TO EVALUATE STONE COLUMN EFFECTIVENESS
Accession Number: 00930562
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: During stone column installation for the seismic retrofit of the Mormon Island Auxiliary Dam, several important parameters of the construction process were continuously monitored using a data acquisition system. This system provided data on operating amperage, stone volume, and treatment time as a function of probe depth. In this study, treatment time and amperage values were analyzed in detail. In addition, equations combining amperage and time were developed to define the amount of energy applied to the soil during remediation. Applied energy, as measured by treatment time and amperage, was then compared to (N1)60 values from Becker penetration tests. This test was selected as the evaluation tool because of the presence of gravel and cobbles. Analysis of the data suggests that the maximum amperage at a given depth can be used to separate layers with high and low fines contents. In general, the maximum amperage was more a function of soil type than of treatment time. For soils with high fines content, the maximum amperage was consistently low relative to soils with low fines content and did not increase significantly with continued vibration. Comparisons between the applied energy and the posttreatment Becker penetration tests results showed that slight improvement is possible in soils with higher fines contents. However, increasing the vibration time in these soils did not increase the (N1)60 values. Therefore, additional time beyond that required to install the column was not useful. For soils with low fines contents, the posttreatment (N1)60 value did tend to increase with additional applied vibration energy, but the scatter in the results was substantial.
Supplemental Notes: This paper appears in Transportation Research Record No. 1786, Geology and Properties of Earth Materials 2002.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Rollins, K MGiles, EPagination: p. 11-19
Publication Date: 2002
Serial: ISBN: 0309077117
Features: Figures
(9)
; References
(3)
TRT Terms: Uncontrolled Terms: Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB
Created Date: Sep 17 2002 12:00AM
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