Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/11212
Title: Analysis of dynamic in situ backfill property tests. Report 1, A method for removing oscillations and damping from diaphragm-type stress gage records
Authors: SRI International.
Seaman, L. (Lynn), 1933-
Lew, Bonnie.
Cooper, Tom.
Lowell, Frances.
Keywords: Diaphragm-type stress gage
In situ soil properties
Oscillatory stress record
Plane shock waves
Processed stress histories
SDOF oscillator gage model
Soil dynamics
Soil mechanics
Testing
Equipment
Instruments
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-87-11 rept.1.
Description: Technical Report
Abstract: A procedure for eliminating or minimizing the effects of stress gage frequency and damping has been developed. The method was applied to SE (diaphragm) stress gages used to measure soil stress during the passage of shock waves. The purposes of this study were to understand how stress records of diaphragm gages are related to imposed stress histories and to develop a method for deriving the stress histories from the records. Two-dimensional wave propagation simulations of embedded gages were made to determine the effects of the gage frequency characteristics on the gage record; the results of these calculations showed that the gage filters the imposed stress like a single-degree-of-freedom oscillator would. Then a method was developed for deriving analytically a stress record corresponding to the response of an oscillator to an imposed stress history. This method was incorporated into an iterative procedure with which a user can construct a best estimate of a stress history acting on a diaphragm gage. This estimate is not necessarily the soil stress that would have existed in the absence of the gage. This record-processing procedure was used to compute stress histories for gages measuring vertical and horizontal stress in the DISKO-1 event executed by the US Army Engineer Waterways Experiment Station.
URI: http://hdl.handle.net/11681/11212
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