1. The maximum density corresponds to (maximum/minimum)_ 2. An increase in the degree of saturation of a soil (increases/decreases) permeability. 3. Shortcoming of direct shear test is that it fails the soil on a designated plane which may not be the weakest one. (a) True (b) False 4. Compaction means the decrease of air voids. (a) True (b) False 5. To determine the grain size distribution of fine-grained soil (smaller than 0.075 mm), Hydrometer test should be conducted. (a) True (b) False True 6. In triaxial test, cell pressure is applied to simulate the actual field condition of the sample in the laboratory. (a) (b) False 7. Sand cone method can be used to determine the in-situ density (field density) of soil. (a) True (b) False 8. What is the particle size (diameter) distribution of clay soil? (a) Smaller than 0.002 mm (c) 0.005 mm to 2.0 mm 9. Specific gravity of clay soil ranges from (a) 2.70 2.80 (b) 2.20-2.50 10. Typically, permeability of clay soil is: void ratio. (b) (d) 0.002 mm to 0.05 mm greater than 2.0 mm (c) 2.60 -2.70 (d) 2.85-2.95 (a) Very low (b) very high (c) high to medium (d) Low to medium

1. The maximum density corresponds to (maximum/minimum)_ 2. An increase in the degree of saturation of a soil (increases/decreases) permeability. 3. Shortcoming of direct shear test is that it fails the soil on a designated plane which may not be the weakest one. (a) True (b) False 4. Compaction means the decrease of air voids. (a) True (b) False 5. To determine the grain size distribution of fine-grained soil (smaller than 0.075 mm), Hydrometer test should be conducted. (a) True (b) False True 6. In triaxial test, cell pressure is applied to simulate the actual field condition of the sample in the laboratory. (a) (b) False 7. Sand cone method can be used to determine the in-situ density (field density) of soil. (a) True (b) False 8. What is the particle size (diameter) distribution of clay soil? (a) Smaller than 0.002 mm (c) 0.005 mm to 2.0 mm 9. Specific gravity of clay soil ranges from (a) 2.70 2.80 (b) 2.20-2.50 10. Typically, permeability of clay soil is: void ratio. (b) (d) 0.002 mm to 0.05 mm greater than 2.0 mm (c) 2.60 -2.70 (d) 2.85-2.95 (a) Very low (b) very high (c) high to medium (d) Low to medium

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter3: Natural Soil Deposits And Subsoil Exploration

Section: Chapter Questions

Problem 3.19P

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Part #2 The following are the results of laboratory consolidation test conducted on clayey soil sample. Determine, graphically, the compression and recompression indices, Cc, Cr of this soil. Using Casagrande's method, determine graphically the preconsolidation pressure. Effective Stress (kPa) Void Ratio (%) 27 1.24 1.21 1.15 1.08 0.99 1.00 1.01 1.02 54 107 214 429 214 107 54
Ex (21) The shear strength equation of a compacted soil can be expressed as (S=T= 9.6+5 tan 30). The results of CU triaxial test with pore water pressure measurements on the same soil at failure are as follows:- Deviator Stress at failure с 1 234 2 350 545 a) Find the shear strength parameters in terms of total stress. b) In CU triaxial test, find the pore water pressure at failure when the cell pressure is (200) kPa (having Deu 21° and Co 54 kPa). c) In CD triaxial test carried out on the same samples of the samme soil, the cell pressure at failure is (200) kPa. Find the deviator stress at failure. Test No. Cell Pressure (кра) 70
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|!;9 ELABORATE Try solving the following problem: Practice Problem: The following are the results of a consolidation test on a sample soil: a. Plot the e-log o' curve b. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, Cc e 1.1 1.085 1.055 1.01 0.94 0.79 0.63 Pressure, o' (ton /ft²) 0.25 0.50 1.00 2.00 4.00 8.00 16.00