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Saturated silty clay encountered in a deep excavation is found to have a water content of 15%. Determine the unit weight of clay. G=2.7

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.12P

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Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.

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Saturated silty clay encountered in a deep excavation is found to have a water content of 15%. Determine the unit weight of clay. G=2.7

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A hand-carved sample of soft saturated clay has a volume of 100 cu.cm and weighs 175 grams. If the oven-dry weight is found to be 120 grams; 1. Calculate the water content of the soil. A. 45.80% B. 42.64% C. 29.57% D. 36.40% 2. Solve the void ratio. A. 1.80 B 1.22 C. 0.84 D. 0.52 E. None of the side
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8. An exploratory drill hole was made in a saturated stiff clay having a water content of 32%. It was observed that the sand layer underlying the clay was under artesian pressure water in the drill hole rose to a height of 4 m. above the top of the sand layer. If an open excavation is to be made in the clay. (See picture below) Determine the void ratio of clay. (Answer: 0.864) Determine the saturated unit weight of clay. (Answer: 18.76 kN/m3) How deep can the excavation proceed before the bottom of the saturated clay heaves or when its effective stress is zero. (Answer: 5.91 m)
A sample of saturated clay, taken from a depth of 5 m, was tested in a conventional oedometer. The table below gives the vertical effective stress and the corresponding thickness recorded during the test. The water content at the end of the test was 40% and the initial height was 20 mm.(a) Plot a graph of void ratio versus ??′(log scale).(b) Determine ?? and ??.(c) Determine ?? between ??′ = 400 kPa and ??′ = 500 kPa. (d) Determine ???′ using Casagrande’s method.
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1. The pressure versus void ratio data determined from a consolidation test on an undisturbed clay specimen are as follows: Applied Pressure (kPa) 20 40 80 160 320 640 1280 320 80 20 0 Void Ratio 0.953 0.948 0.938 0.920 0.878 0.789 0.691 0.719 0.754 0.791 0.890 (a) Plot this pressure versus void ratio data on a semi-logarithmic graph. (b) Determine the equations for the virgin compression curve and for the rebound curve for unloading starting at 1,280 kPa. (c) What are the corresponding compression and recompression indices for this soil? (d) Estimate the stress to which this clay has been preconsolidated. (After A. Casagrande.)