Settlement of shallow foundations. Structures built on a shallow foundation (e.g., a concrete slab-on-grade foundation) are susceptible
Question:
Settlement of shallow foundations. Structures built on a shallow foundation (e.g., a concrete slab-on-grade foundation)
are susceptible to settlement. Consequently, accurate settlement prediction is essential in the design of the foundation. Several methods for predicting settlement of shallow foundations on cohesive soil were compared in LO5 Environmental & Engineering Geoscience (Nov. 2012).
Settlement data for a sample of 13 structures built on a shallow foundation were collected. The actual settlement values (measured in millimeters) for each structure were compared to settlement predictions made using a formula that accounts for dimension, rigidity, and embedment depth of the foundation. The data are listed in the table.
Structure Actual Predicted 1 11 11 2 11 11 3 10 12 4 8 6 5 11 9 6 9 10 7 9 9 8 39 51 9 23 24 10 269 252 11 4 3 12 82 68 13 250 264 Source: Ozur, M. “Comparing methods for predicting immediate settlement of shallow foundations on cohesive soils based on hypothetical and real cases.” Environmental & Engineering Geoscience, Vol. 18, No. 4, Nov. 2012 (from Table 4).
a. What type of design was employed to collect the data?
b. Use the information in the accompanying SAS printout to construct a 99% confidence interval for the mean difference between actual and predicted settlement value. Give a practical interpretation of the interval.
c. Explain the meaning of “99% confidence” for this application.
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