A DEVICE FOR MEASURING TENSIONS IN WATER

THE MEASUREMENT OF NEGATIVE PORE WATER PRESSURES IN SOIL SYSTEMS IS IMPORTANT IN BOTH RESEARCH AND DESIGN STUDIES ON PRECOMPRESSED SATURATED CLAYS AND PARTIALLY SATURATED COMPACTED CLAYS. TO DATE, NO EQUIPMENT THAT CAN MEASURE WATER TENSIONS BELOW ABSOLUTE ZERO PRESSURE UNDER CONDITIONS OF CHANGING EXTERNAL STRESS HAS BEEN AVAILABLE. THIS PAPER DESCRIBES SUCH EQUIPMENT. IN THE DEVICE DESCRIBED HERE, THE SENSING ELEMENT CONTACTING THE SOIL IS A FINE-GRAINED CERAMIC STONE, WHICH IS CONNECTED BY A CLOSED WATER SYSTEM TO A FLEXIBLE STEEL MEMBRANE. TENSION IS CONTROLLED BY EXTERNALLY ADJUSTING THE MEMBRANE DEFLECTION. THE ABSENCE OF A FREE WATER SURFACE PREVENTS CAVITATION. CALIBRATION DATA DEMONSTRATE THAT THE PORE PILOT CAN INDEED MEASURE WATER TENSIONS BELOW ABSOLUTE ZERO PRESSURE. /AUTHOR/

Media Info

  • Monograph Title: Water tensions: swelling mechanisms: strength of compacted soil
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00235313
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 9 1994 12:00AM