SETTLEMENTS OF CIRCULAR, RIGID FOUNDATIONS ON NON-COHESIVE SOIL INFLUENCE OF DYNAMIC PRELOADING

SAETININGAR HOS CIRKULAERA, STELA FUNDANENT PAA FRIKTIONSJORD. INVERKAN AV DYNAMISK FOERBELASTNING

THE INVESTIGATION DEALS WITH SETTLEMENTS UNDER STATIC AND DYNAMIC LOADING OF A CIRCULAR, RIGID FOUNDATION ON DENSE, NON-COHESIVE SOIL. IT SPECIALLY DEALS WITH IMPULSIVE LOADING FROM A DROP HAMMER AND ITS EFFECT ON SETTLEMENTS UNDER SUBSEQUENT STATIC LOADING. THE NON COHESIVE SOIL IS LOADED WITH A UNIFORM OVERBURDEN PRESSURE, REPRESENTING THE WEIGHT OF LOOSE SOIL AROUND A DEEP FOUNDATION. THE INVESTIGATION SHOWS, FOR BOTH MOIST AND SATURATED SOIL, THAT REPEATED DYNAMIC LOADING WITH A DROP HAMMER HAS A HARDENING EFFECT ON THE SOIL WITHIN THE ACTUAL RANGE OF OVERBURDEN PRESSURES. A COMPARISON BETWEEN THE RESULTS OF STATIC AND DYNAMIC LOAD TESTS SHOWS THAT SETTLEMENTS UNDER STATIC LOADING CAN BE PREDICTED FROM A DYNAMIC LOAD TEST WITH A DROP HAMMER AND DYNAMIC THEORY OF ELASTICITY. THE TESTS SHOW THAT THE RATE OF LOADING CAN BE DECREASED WITH A RUBBER CUSHION PLACED ON TOP OF THE FOUNDATION. THE RESULTS IMPLY THAT DYNAMIC PRELOADING WITH A DROP HAMMER CAN BE USED BOTH TO REDUCE AND PREDICT SETTLEMENTS DURING SUBSEQUENT STATIC LOADING. EQUIPMENT SUGGESTED FOR PRELOADING OF THE SOIL BENEATH THE TIP OF A BORED PILE IS DESCRIBED IN THE REPORT.

• Corporate Authors:

  National Swedish Institute for Building Research

  Box 27 163, 102 52
  Stockholm,   Sweden 
• Authors:
  • Eresund, S
• Publication Date: 1972

Language

• Swedish

Media Info

• Features: Figures; Photos; References;
• Pagination: 168 p.

Subject/Index Terms

• TRT Terms: Dynamic loads; Equipment; Foundations; Granular soils; Ground settlement; Hammers; Loads; Machine valves; Overburdens; Pile driving; Pile hammers; Precast concrete; Repeated loads; Static loads; Stiffness; Support piles
• Uncontrolled Terms: Preloading; Rigid foundations
• Old TRIS Terms: Non-cohesive soil; Static loading
• ITRD Terms: 3641: Driving (pile); 3377: Foundation; 3681: Hammer; 5567: Load; 4109: Non cohesive soil; 3399: Pile; 5588: Repetitive loading; 5792: Settlement
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00081067
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: No. R 41:1972 R&D Rept.
• Files: ITRD, TRIS
• Created Date: Apr 8 1975 12:00AM