A compressible clay layer 5 m thick carries an overburden of pervious sand and rests on an impervious bed of rock. A structure with a large construction area, founded in the sand, causes the same increase in vertical effective stress throughout the clay layer. Results of an oedometer test on a sample of the clay, 19 mm thick, showed that the void ratio decreased from 0.85 to 0.83 under a corresponding increase in pressure and the consolidation was 75% complete after 30 min. The following values of time factor versus degree of consolidation are available: U: 0.45 0.65 0.85 Ty: 0.15 0.30 0.60 Estimate the final settlement of the structure due to consolidation of the clay. Also, estimate the time elapsing before one-half of the final settlement has taken place.

A compressible clay layer 5 m thick carries an overburden of pervious sand and rests on an impervious bed of rock. A structure with a large construction area, founded in the sand, causes the same increase in vertical effective stress throughout the clay layer. Results of an oedometer test on a sample of the clay, 19 mm thick, showed that the void ratio decreased from 0.85 to 0.83 under a corresponding increase in pressure and the consolidation was 75% complete after 30 min. The following values of time factor versus degree of consolidation are available: U: 0.45 0.65 0.85 Ty: 0.15 0.30 0.60 Estimate the final settlement of the structure due to consolidation of the clay. Also, estimate the time elapsing before one-half of the final settlement has taken place.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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