Effect of Compression Index and Consolidation Coefficient on Settlement of Rectangular Foundation Resting on Clayey Soil
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Keywords:
Clay, Compression Index, Coefficient Of Consolidation, Settlement, Settle 3DAbstract
Significant settlements may occur in the soils because of structural loads. These settlement
values are affected by multiple factors. Consolidation coefficient and compression index are among the
factors that change settlement calculations the most. In this study, the model was created in the Settle 3D
program to analyze a 30m deep soil profile consisting of 10m clay, 10m sand, and 10m gravel, with the
water level at the ground surface. A 10m x 20m rectangular foundation loaded with 10 kPa was considered.
The construction period was 365 days, and settlement calculations were performed for 12 different periods
ranging from 15 days to 50 years. The 50 years with the highest settlement values were taken into account
in the evaluations. A total of 2025 analyses were made by changing the consolidation coefficient,
compression index, and unit volume weights. Results showed that after the consolidation coefficient of clay
reaches 0.002 m2/year for all unit volume weights and compression indices, settlement reaches its maximum
value for the relevant situation, and increasing the consolidation coefficient does not change the result. The
lowest and highest settlement values detected in all analyses were 2.96 cm and 134 cm, respectively. At the
same time, the minimum settlement value found when the compression index value is 0.7 and above is 25.3
cm. This situation causes serious problems for structures due to the settlement of high plasticity clay soils
with high compression index and coefficient of consolidation.
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References
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Rocscience, Settle 3D Software.
