Accession Number : ADA182710

Title :   Computer-Based System for Torsionally and Longitudinally Cycling Soil Specimens Confined under Triaxial States of Stress.

Descriptive Note : Final technical rept. 1 Jul 84-31 Dec 85,

Corporate Author : TEXAS UNIV AT AUSTIN GEOTECHNICAL ENGINEERING CENTER

Personal Author(s) : Stokoe,Kenneth H , II ; Ni,Sheng-Huoo

PDF Url : ADA182710

Report Date : Jun 1987

Pagination or Media Count : 33

Abstract : A microcomputer-based set of instrumentation was purchased, configured and programmed for laboratory use in resonant column and slow cyclic (RCSC) testing of soils. This system is capable of exciting cylindrical soil specimens in either torsional or longitudinal motion. The specimens can be confined either isotropically (sigma 1' signam 2' = 3'), biaxially sigma ' sigma 2' = sigma 3') or true triaxially (sigma 1' sigma 2' sigma 3'). Resonant testing is performed at frequencies typically above 20 Hz while slow cyclic testing is performed at frequencies of 1 Hz or less. To computerize the RCSC test, all existing manually-controlled electronic equipment (used originally in torsional resonant testing) had to be replaced by digital electronic equipment. This equipment had to be configured so that an HP 200 series microcomputer could control the testing and perform data acquisition automatically. To complete the automated, computer-aided, test system, a computer program named RCTEST was coded (Ni and Stokoe, 1987). Besides the main program which involves test control and data acquisition, several supplementary programs were also developed to help the user in reducing test data and performing data communications with the mainframe computer at The University of Texas at Austin. (Author)

Descriptors :   *COMPUTER APPLICATIONS, *SOIL MECHANICS, *SOIL TESTS, *TRIAXIAL STRESSES, COMPUTER PROGRAMS, DATA ACQUISITION, DIGITAL SYSTEMS, ELECTRONIC EQUIPMENT, RESONANCE, CYCLIC TESTS, SOILS, DATA TRANSMISSION SYSTEMS, LABORATORIES, TEST AND EVALUATION, EXPERIMENTAL DATA, MICROCOMPUTERS, TEXAS, TORSION

Subject Categories : Soil Mechanics
      Mechanics
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE