BASE STABILITY AND GROUND MOVEMENT PREDICTION FOR EXCAVATIONS IN SOFT CLAY

In this paper, a method is proposed for evaluating the factor of safety against base failure which accounts for the reinforcing effects of wall penetration below the base of excavation. The derivation of the factor of safety is provided, and the assumptions supporting the derivation are tested relative to the measured deformations of excavation walls in the field. Factors of safety are calculated for several deep excavations, which had been near or at failure, and compared with the factors of safety calculated for these cuts according to current stability evaluation procedures. Simplified methods for estimating horizontal wall movements are reviewed, and a movement prediction method is proposed on the basis of plasticity principles and the factor of safety against base failure. Applications of the simplified predictive techniques are illustrated by means of a case history. Finally, the predictive methodologies for ground deformation are examined in context of a general approach for the estimation of ground movement and its effects on structures adjacent to braced and tied-back excavations. (A) For the covering abstract see IRRD 860485.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0727719327
• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • O'ROURKE, T D
• Conference:
  • RETAINING STRUCTURES. PROCEEDINGS OF THE CONFERENCE ORGANIZED BY THE INSTITUTION OF CIVIL ENGINEERS AND HELD ON 20-23 JULY, 1992 AT ROBINSON COLLEGE, CAMBRIDGE
• Publication Date: 1993

Language

• English

Media Info

• Features: References;
• Pagination: p. 657-86

Subject/Index Terms

• TRT Terms: Clay; Conferences; Failure; Forecasting; Mathematical models; Motion; Retaining walls; Safety; Soft soils; Stability (Mechanics)
• Old TRIS Terms: Softness
• ITRD Terms: 4177: Clay; 5905: Compressibility; 8525: Conference; 5520: Failure; 132: Forecast; 6473: Mathematical model; 5483: Movement; 3359: Retaining wall; 1665: Safety; 5930: Stability
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00643247
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-7277-1932-7
• Files: ITRD
• Created Date: Mar 10 1994 12:00AM