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Title: Development and implementation of instrumentation for WIPP Test Series A of the small-scale seal performance tests
Authors: Sandia National Laboratories
Ainsworth, Donnie L.
Keywords: Borehole plugging
Expansive concrete
Borehole seal instrumentation
Concrete instrumentation
Radioactive waste disposal
Waste Isolation Pilot Plant
New Mexico
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-88-4.
Description: Technical Report
Abstract: An instrumentation program was developed for the purpose of monitoring the state of stress and deformation in a concrete borehole seal for use underground at the WIPP. A laboratory development program was conducted both to select gages for a field experiment and to measure for evaluation purposes the stresses and strains in an expansive salt saturated concrete plug, 3 ft in diameter by 3 ft long, cast in a 34-3/4-in. I.D. by 5-ft-long steel casing with 5/8-in. wall thickness. A total of 33 internal gages were placed in the concrete and 9 gages were located on the external surface of the steel casing. The gages were strategically located to provide the maximum useful information for thermal and structural analysis for the plug. The gages used were: Carlson stress meters; Sandia pressure cells; Carlson strain meters; Ailtech strain meters; SR-4 strain gages; and type T thermocouples. Based on their performance in the laboratory program, gages were selected for installation in a field experiment at the WIPP. Three vertical boreholes seals, 6-, 16-, and 36-in.-diameter holes were instrumented. Carlson stress meters and Sandia pressure cells were used to measure the stress in the seal. Carlson strain meters and Ailtech strain meters measured the strain in the seal. SR-4 strain gages were fixed to the borehole wall to measure strain at the seal-rock interface. Type E thermocouples were used to measure the temperature in the seal and at the seal-rock interface. The gages were preassembled on a mounting fixture, with the exception of the Carlson joint and stress meters and the SR-4 gages, and positioned in the holes prior to the placement of the concrete. As in the laboratory experiment, the gages were strategically located to provide the optimum description of the concrete seal performance.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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