A THEORETICAL STUDY OF PILE/ ROCK SOCKET BEHAVIOUR

The behaviour of piles socketed into a homogeneous rock mass is studied using a finite element technique. A pointwise strain-softening model of the interface behaviour is adopted. This model corresponds to the situation where there is a break in the cement bond between the concrete and rock once the peak shear strength is reached at that point. Consideration is given to the influence of socket geometry, the relative stiffness of the pile and rock, the angle of friction at the interface, the initial horizontal stresses at the interface prior to loading, and the roughness of the socket. It is shown that under certain combinations of these fundamental parameters, a brittle response of the pile may be anticipated. Other combinations of these parameters are shown to give rise to a simple plastic or even plastic workhardening response of the pile even though the interface behaviour is pointwise strain-softening. The results of a simplified analysis are presented in a chart form which may be used in the design of socketed piles. These charts provide an estimate of the pile head settlement, the load transfer to the pile base and the shear mobilisation along the socket for a given pile load. (Author/TRRL)

• Corporate Authors:

  University of Sydney

  School of Civil Engineering, Parramatta Road
  Sydney, New South Wales  Australia  2006
• Authors:
  • Rowe, R K
  • PELLS, PJN
• Publication Date: 1980-7

Media Info

• Features: Figures; References; Tables;
• Pagination: 44 p.

Subject/Index Terms

• TRT Terms: Brittleness; Coefficient of friction; Deformation; Design; Finite element method; Friction; Ground settlement; Heat transfer; Loads; Mass; Motion; Piles (Supports); Restraint systems; Rocks; Shear strength; Sockets (Electricity); Stiffness; Structural connection; Transfer characteristics
• Uncontrolled Terms: Friction angle; Rock mass
• Old TRIS Terms: Sockets
• ITRD Terms: 5900: Brittleness; 5460: Coefficient of friction; 5595: Deformation; 9011: Design (overall design); 6490: Finite element method; 5567: Load; 5483: Movement; 3399: Pile; 3422: Restraint (fixing); 4154: Rock; 5792: Settlement; 5531: Shear; 5931: Stiffness; 6731: Transfer (phys)
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Safety and Human Factors; I24: Design of Bridges and Retaining Walls; I43: Rock Mechanics;

Filing Info

• Accession Number: 00331450
• Record Type: Publication
• Source Agency: ARRB
• Report/Paper Numbers: Res Rpt. R 368 Monograph
• Files: ITRD, TRIS, ATRI
• Created Date: Oct 28 1981 12:00AM