RESPONSE TESTING OF PIEZOMETERS IN FRACTURED POROUS MEDIA

Conventional methods of piezometer response testing are unsuitable for analyzing observed data from three piezometers placed in fractured coal and siltstone units. However, these responses correspond closely to the results of pressure tests in fractured limestones (pollard). Following an extended form of the pollard analysis, the fracture porosity within fractured coal units is calculated to comprise approximately 3.7% of the total porosity. In the deeper siltstone unit, the fracture porosity makes up only 0.5% of the total porosity. The application of basic time lag principles (hvorslev) to separate segments of the pollard plot makes it possible to determine the hydraulic conductivity of the matrix and fracture systems. The hydraulic conductivity of the fracture system is calculated to be 40 to 250 times higher than the matrix. (A) /TRRL/

• Corporate Authors:

  Royal Canadian Geographical Society

  488 Wilbrod Street
  Ottawa 2, ONo,   Canada 
• Authors:
  • Schwartz, F W
• Publication Date: 1975-8

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 408-12
• Serial:
  • Canadian Geographic Journal
  • Volume: 12
  • Issue Number: 3

Subject/Index Terms

• TRT Terms: Coal; Cracking; Fracture mechanics; Limestone; Matrices (Mathematics); Permeability coefficient; Piezometers; Porosity; Pressure; Silts; Siltstones; Testing; Tests
• Uncontrolled Terms: Fracture
• ITRD Terms: 5211: Cracking; 4131: Limestone; 6107: Piezometer; 5938: Porosity; 5412: Pressure; 4149: Silt; 6255: Test
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00129658
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 7 1976 12:00AM