SETTLEMENTS OBSERVED UNDER A TRIAL FILLER WITH PREFABRICATED VERTICAL DRAINED FOUNDATION (In Turkish)


Berilgen M. M. , Özaydin I. K. , Yildirim S.

Second National Geosynthetics Conference, İstanbul, Turkey, 16 - 17 November 2006, pp.155-164

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.155-164

Abstract

The behavior of an instrumented test fill is analysed in order to assess the effectiveness of a

preloading with vertical prefabricated drains design to improve the soil layers at the site of

Konya Wastewater Treatment Plant where large pool type structures are planned to be

constructed. The foundation layers of the test fill had be instrumented with settlement plates

and magnetic settlements columns, the readings of which are evaluated together with fill

placement programme, and they are compared with the results of a finite element analysis

modelled to duplicate field loading and drainage conditions. In the coupled analysis

performed elasto-plastic material behavior is considered and material properties are derived

from SPT blow count numbers and laboratory oedometer and unconsolidated undrained (UU)

triaxial test results. Observed field behavior and the results of finite element analysis have

shown that planned preloading scheme will be sufficient to obtain the required degree of soil

improvement and the vertical drains will provide for the degree of consolidation within the

planned time period. It is also shown that the method of numerical analysis used in this study

utilizing the material properties obtained from field and laboratory testing can successfully

predict the field behavior.