SETTLEMENT OBSERVATION OF THE 2ND MAINLAND BRIDGE, LAGOS, NIGERIA

This report is concerned with the settlement characteristics of the foundation of the 2nd mainland bridge at lagos, nigeria during the period 1967 (before the superstructure was in place) till 1970, 2 1/2 years after its opening to traffic. The object of the investigation was to study the rate of settlement to find out whether it was excessive. The author describes the method of observation used and the precautionary measures that were taken to eliminate errors. Details are given of the methods used to overcome the problems due to the long and short sights in the lagoon levelling operations, the effect of vibration caused by wind and traffic, the mis-use of level points and the lack of continuity in the team. Detailed results are given and discussed. The author recommends that observations be continued for the next 6 years to check on long-term consolidation of compressible clays. It is concluded that 85% of the total settlement took place at the onset of the application of live-load; that because the maximum settlement was about 1 1/2 inches with a maximum differential of 1/2 inch between the carriageways and A maximum differential between adjacent piers of 3/4 inch, there was no likelihood of instability or structural damage and that level points should be inserted above ground level in future surveys. /TRRL/

  • Corporate Authors:

    Federal Ministry of Works and Housing, Nigeria

    Materials and Research Division, 15 Awolowo Road
    Lagos 12635,   Nigeria 
  • Authors:
    • Odembe, J E
  • Publication Date: 1972-9

Media Info

  • Features: Figures; Tables;
  • Pagination: 49 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00125644
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Res. Note No. 3 R&D Rept.
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM