THE PERFORMANCE OF A TIMBER CRIB FOUNDED ON SOFT VERY SENSITIVE LACUSTRINE CLAY

A TIMBER CRIB INTAKE STRUCTURE WAS CONSTRUCTED OFFSHORE IN A LAKE FOUNDED ON A VERY SOFT TO SOFT CLAY OF HIGH MOISTURE CONTENT AND SENSITIVITY. THE CLAY IS A LATE GLACIAL FRESH-WATER SEDIMENT WHICH HAS BEEN CONSOLIDATED BY PRESSURES PROBABLY NOT EXCEEDING OVERBURDEN PRESSURE. SAMPLING AND TESTING OF THE CALY INDICATED A TWO-PART CONSOLIDATION CURVE WITH THE BREAK OCCURRING AT A POINT ABOUT 400 LB/SQ. FT. IN EXCESS OF THE INSITU OVERBURDEN PRESSURE. BEYOND THE BREAK IN THE OEDOMETER CURVE THE COMPRESSION INDEX WAS UP TO 30 TIMES GREATER THAN IN THE INITIAL PORTION BEING A MAXIMUM OF 3.0 TO 3.5. THE CRIB WAS FOUNDED ON A SAND AND GRAVEL MATTRESS KEYED INTO THE LAKE BOTTOM, THE RESULTING NET STRESS INCREASE ON THE CLAY BEING SLIGHTLY WITHIN THE INFERRED RANGE OF APPARENT PRECONSOLIDATION ESTABLISHED BY BY LABORATORY TESTS. PERFORMANCE READINGS ON THE CRIB FOR A PERIOD OF ABOUT A YEAR AFTER CONSTRUCTION HAVE SUBSTANTIATED THE FIELD EXISTENCE OF AN APPARENT PRECONSOLIDATION OF ABOUT THE ORDER OF MAGNITUDE PREDICTED BY LABORATORY TESTS. /CGRA/

• Supplemental Notes:
  • Vol 5, No 1, PP 1-15, 8 FIG, 2 TAB, 2 PHOT, 18 REF
• Authors:
  • Brezinski, L S
• Publication Date: 0

Media Info

• Serial:
  • CANADIAN GEOTECHNICAL JOURNAL
  • Issue Number: 0
  • Publisher: National Research Council of Canada

Subject/Index Terms

• TRT Terms: Clay; Foundation soils; Gravel; Lacustrine deposits; Mattresses (Foundations); Performance; Preconsolidation pressure; Sand; Sensitive clays; Timber construction
• Old TRIS Terms: Cribs; Lake beds; Mattresses; Preconsolidated clay
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00230944
• Record Type: Publication
• Source Agency: CANADIAN GOOD ROADS ASSOCIATION
• Files: TRIS
• Created Date: Aug 15 2004 2:40AM