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|Title:||In situ and laboratory shear devices for rock : a comparison|
|Authors:||Nicholson, Glenn A.|
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-83-14.|
Abstract: Shear strength parameters were measured using an assortment of testing devices. The results were compared and contrasted. The devices included machines routinely used by the U. s. Army Corps of Engineers and several machines with new or unusual features. The tests were performed on rock simulant and Rangely sandstone. The tests on rock simulant used specimen suites that included smooth cast joints, joints with asperities, and intact material. The tests on the Rangely sandstone were performed on clean discontinuities. All tests on the rock simulant were performed in the laboratory. One of the test suites on the sandstone was performed in situ; the remainder of the tests were performed in the laboratory. The tests showed substantial differences in strength parameters due to test machine details. The study demonstrated the need for a reliable direct shear device capable of testing 6-in.-diam core.
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