Accession Number : ADA290878

Title :   Experimental Determination of Probability Distributions for Parameters of a Salem Limestone Cap Plasticity Model.

Descriptive Note : Technical rept. 31 Jan 92-30 Jun 94,

Corporate Author : RE/SPEC INC RAPID CITY SD

Personal Author(s) : Fossum, Arlo F. ; Pfeifle, Tom W. ; Mellegard, Kirby D.

PDF Url : ADA290878

Report Date : 01 JAN 1995

Pagination or Media Count : 63

Abstract : Marginal probability density functions and a correlation matrix are determined for parameters of the Weidlinger cap plasticity model for Salem limestone specimens originating from Bedford, Indiana. The report describes a program comprising precision laboratory testing, parameter estimation, and probability distribution model fitting. A novel testing scheme allows a complete set of material parameters to be determined from a single test specimen. Statistical properties and distributions are determined by replication. The fitted model is validated by predicting loading histories not included in the fitting database. The testing program includes uniaxial strain tests in axial strain control ), unconfined compression tests in ail strain control, hydrostatic compression tests in load control, and triaxial compression tests in axial strain control during loading and load control during unloading . All specimens are tested at a constant temperature of 20 deg C and at a water saturation level of 50%. The validation study clearly demonstrates that the parameter estimation procedure produces high quality parameter values, and that the fitted model can not only reproduce measured data included in the fitting database, but also predicts responses from tests conducted under loading histories different from those found in the fitting database. (AN)

Descriptors :   *STRUCTURAL MECHANICS, *PROBABILITY DENSITY FUNCTIONS, *LIMESTONE, TEST AND EVALUATION, COMPRESSION, STRESS STRAIN RELATIONS, DATA BASES, MATHEMATICAL MODELS, EXPERIMENTAL DATA, LABORATORY TESTS, PARAMETERS, PROBABILITY DISTRIBUTION FUNCTIONS, ESTIMATES, MATHEMATICAL PREDICTION, SHEAR STRESSES, HYDROSTATICS, PLASTIC PROPERTIES, CORRELATION TECHNIQUES, AXIAL LOADS, LOAD CONTROL, UNDERGROUND STRUCTURES, SEDIMENTARY ROCK.

Subject Categories : Geology, Geochemistry and Mineralogy
      Statistics and Probability
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE