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Title: Tests of rock cores, Pease study area, New Hampshire
Authors: Space and Missile Systems Organization (U.S.)
United States. Air Force. Systems Command
Crisp, Robert W.
Keywords: Pease study area, New Hamphire
Petrographic examination
Rock cores
Rock properties
Rock tests
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-70-11.
Description: Miscellaneous paper
Abstract: Laboratory tests were conducted on rock core samples received from six core holes in the Pease study area of Belknap, Cheshire, Grafton, and Merrimack Counties in New Hampshire. Results were used to determine the quality and uniformity of the rock to depths of 200 feet below ground surface. The rock core was petrographically identified as predominately mica gneiss, mica schist, dacite, granite gneiss, and muscovite granodiorite, with relatively minor quantities of tonalite, granodiorite gneiss, and basaltic material. Evaluation of the Pease study area core on a hole-to-hole basis indicates the moderately fractured and intact dacite removed from Hole PZ-CR-36 to be very competent rock. The highly fractured core, removed at depths of 40 feet or less below ground surface, was marginal in quality. Generally, this hole yielded material representative of competent, hard rock media. The remainder of the holes from this area, i.e., PZ-CR-2, -11, -23, -25, and -34, generally yielded rock core exhibiting physical properties characteristic of marginal to barely competent material. Holes PZ-CR-11, -23, and -34 yielded incompetent core from depths greater than 50 feet below ground surface, dictating classification of the core as unsuitable as competent media. Holes PZ-CR-2 and -25 yielded significantly quantities of rock of marginal quality, but, dependent on results of possible further investigation, could offer some possibility as competent hard rock media. The above evaluations and conclusions have been based on somewhat limited data; therefore, more extensive investigation will be required in order to accurately assess the individual areas under consideration
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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