THERMODYNAMICS OF GRANULAR SYSTEMS

THE THERMODYNAMICS OF GRANULAR SOIL SYSTEMS ARE INVESTIGATED. THE THERMODYNAMIC TREATMENT OF SOIL COMPRESSION FOLLOWS BY ANALOGY TO CLASSIC THERMODYNAMICS. TEMPERATURE AND HEAT CONTENT ARE DETERMINED ON THE BASIS OF THE ENERGY PRINCIPLE FROM PROPERTIES OF GRANULAR SYSTEMS THAT CAN BE MEASURED MICROSCOPICALLY. TEMPERATURE AND HEAT CONTENT ARE DERIVED FOR DEFINITE WORK PROCESSES AND GENERAL CONCLUSIONS ARE DRAWN. WORK PROCESSES ARE DEFINED AS THOSE IN WHICH THE GRANULAR SYSTEM RECEIVES WORK, AS IN MIXING, SEGREGATION, COMPRESSION, EXPANSION, AND SHEAR. A METHOD WAS PROPOSED TO DETERMINE THE AMOUNT OF HEAT PRODUCED IN WHICH A SIMPLE COMPRESSION TEST WAS USED AS COMPARISON PROCESS. IT WAS SHOWN THAT THE INFLUENCE OF TEMPERATURE AND HEAT IN SUCH WORK PROCESSES IS COMPARITIVELY SMALL, AND THAT THE TEMPERATURE CHANGES ARE ALSO VERY SMALL. THE STUDY CONCLUDES THAT: (1) GRANULAR SYSTEMS CAN BE CONSIDERED AS THERMODYNAMIC SYSTEMS, (2) THE METHODOLOGY THAT WAS DEVELOPED PERMITS USE OF SIMPLE ANALYTICAL FUNCTIONS FOR THE EXPRESSION OF A LARGE NUMBER OF RELATIONSHIPS EXISTING BETWEEN MACROSCOPIC PARAMETERS, (3) IN ACCORDANCE WITH CLASSICAL METHODOLOGY, THERMODYNAMIC PARAMETERS MAY BE DETERMINED IN TWO DIFFERENT MANNERS: THEY MAY BE CALCULATED FROM DIRECT MACROSCOPIC MEASUREMENTS, OR THEY CAN BE CALCULATED OR ESTIMATED FROM THE COMPOSITION OF THE SYSTEM BY UTILIZING THE CONCEPT OF MIXED-PHASE CHARACTER, AND (4) THE LIMITATIONS OF CLASSICAL THERMODYNAMIC METHODOLOGY HAVE BEEN INDICATED.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 91-113
  • Monograph Title: Effects of temperatures and heat on engineering behavior of soils
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00237758
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Aug 25 1994 12:00AM