Abstract
In this study, it was aimed to map the corrected Standard Penetration Test (SPT) values in Karşıyaka city center by kriging approach. Six maps were prepared by this geostatistical approach at depths of 3, 6, 9, 13.5, 18 and 25.5 m. Borehole test results obtained from 388 boreholes in central Karşıyaka were used to model the spatial variation of (N1)60cs values in an area of 5.5 km2. Corrections were made for depth, hammer energy, rod length, sampler, borehole diameter and fines content, to the data in hand. At various depths, prepared variograms and the kriging method were used together to model the variation of corrected SPT data in the region, which enabled the estimation of missing data in the region. The results revealed that the estimation ability of the models were acceptable, which were validated by a number of parameters as well as the comparisons of the actual and estimated data. Outcomes of this study can be used in microzonation studies, site response analyses, calculation of bearing capacity of subsoils in the region and producing a number of parameters which are empirically related to corrected SPT number as well.
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Acknowledgement
This study is based on the data obtained from projects 105M336 and 106M013, supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK).
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List of symbols
List of symbols
- a :
-
Range in model
- C :
-
Variance between predetermined two points
- C 0 :
-
Nugget in model
- C B :
-
Borehole diameter correction
- C E :
-
Hammer energy correction
- C fines :
-
Fines content correction
- C N :
-
Overburden pressure correction
- C R :
-
Rod length correction
- C S :
-
Sampler correction
- CPT:
-
Cone penetration test
- CSR:
-
Cyclic stress ratio
- FC :
-
Percentage of fines content
- GIS :
-
Geographic information system
- H :
-
Lag distance between two points
- LPI:
-
Liquefaction probability index
- MAE:
-
Mean absolute error
- (N1)60 :
-
Corrected number of blow counts
- (N1)60cs :
-
Number of blow counts corrected by fines content
- N(h):
-
Number of data pairs separated within a predefined lag distance
- p:
-
Estimated value
- R:
-
Refusal in standard penetration test
- RMSE:
-
Root mean square error
- SPT:
-
Standard penetration test
- SPT-N:
-
Experimentally obtained standard penetration value
- UTM:
-
Universal transverse mercator
- u :
-
Location of variable z
- y :
-
Calculated value
- z :
-
Variable in kriging
- α :
-
Lagrange coefficient used in the minimization of the error variance
- γ(h):
-
Variogram
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ALTUN, S., GÖKTEPE, A.B. & SEZER, A. Geostatistical interpolation for modelling SPT data in northern Izmir. Sadhana 38, 1451–1468 (2013). https://doi.org/10.1007/s12046-013-0183-8
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DOI: https://doi.org/10.1007/s12046-013-0183-8