3. A 405 cm³ volume of fully saturated clay weights 8.1 N and the specific gravity of the solids is 2.70. Given the liquid limit and the plastic limit of the clay are LL (W₁) = 40% and PL (wp )= 10.5%, respectively. (1) Find the plasticity index PI of the clay. (2) What is the liquidity index of the clay? (3) Do you expect a brittle type of failure of this soil? Why?

3. A 405 cm³ volume of fully saturated clay weights 8.1 N and the specific gravity of the solids is 2.70. Given the liquid limit and the plastic limit of the clay are LL (W₁) = 40% and PL (wp )= 10.5%, respectively. (1) Find the plasticity index PI of the clay. (2) What is the liquidity index of the clay? (3) Do you expect a brittle type of failure of this soil? Why?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.20P

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Concept explainers

Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.

Question

3. A 405 cm³ volume of fully saturated clay weights 8.1 N and the specific gravity of the
solids is 2.70. Given the liquid limit and the plastic limit of the clay are LL (w₁) = 40%
and PL (wp )= 10.5%, respectively.
(1) Find the plasticity index PI of the clay.
(2) What is the liquidity index of the clay?
(3) Do you expect a brittle type of failure of this soil? Why?

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STATEMENTS: A - an increase in volume is expected in 2:1 expanding type of clay when wet/saturated with water. B - cracking is expected when an expanding type of clay dries. A- both statements are trueB- neither statements are trueC- only statement A is true D- only statement B is true
4.15 The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 (а) Determine the liquid limit of this clay. (b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. (c) Do you expect a brittle type of failure for this soil? Justify your answer.
The dry unit weight of a sand sample in the loosest state is 13.34 kN/m³ and in the densest state, it is 21.19 kN/m³. Its grain specific gravity is 2.70 and has a porosity of 33%. 23. Determine the void ratio of the sand at the given porosity. b. 0.6493 а. 0.4925 C. 0.4241 d. 0.5256 24. Determine the relative density. а. 0.670 b. 0.605 С. 0.655 d. 0.625 25. Find the relative compaction. a. 95.67% b. 93.52% C. 83.12% d. 83.75%
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Please explain clearly..... Thank you
A certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. (Table on the right) Solution: Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e = Thus the relative density is found to be Dr = • According to the table, the soil is classified as %; soil. TABLE 3.3 CONSISTENCY OF COARSE-GRAINED SOILS AT VARIOUS RELATIVE DENSITIES (data from Lambe and Whitman, 1969) Relative Density, D,(%) 0-15 15-35 35-65 65-85 85-100 Classification Very loose Loose Medium denseª Dense Very dense "Lambe and Whitman used the term "medium," but "medium dense" is better because "medium" usually refers to the particle size distribution.
a）For clays, the failure line (one that connects the peak failure stresses) in the normally consolidated range does not have a cohesion intercept, whereas the failure line in the overconsolidated range has a cohesion intercept. T or F B）During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will: 1 decrease. 2 could increase or decrease. 3 remain a constant. 4 increase. C)What does the cohesion (that appears in the Mohr-Coulomb criterion) of OC clays depend on? 1the preconsolidation pressure. 2whether the failure stresses are total or effective. 3the soil type. 4everything listed here.
In general, clays tend to have a more pronounced failure: -True -False
Detailed solution please A clay has the following Atterberg limits: liquid limit = 60%, plastic limit = 40%, shrinkage limit = 25%. The clay shrinks from 15 cubic centimeters to 9.57 cubic centimeters when the moisture content is decreased from the liquid limit to the shrinkage limit. a. What is the specific gravity? b. What is the plasticity index? c. What is the liquidity index if the water content is 52%? d. From a hydrometer analysis to determine particle sizes, it is found that 45 percent of the sample consists of particles smaller that 0.002 mm. From this information indicate the activity classification of the clay.
The coefficient of earth pressure at rest for a sand having the Poisson's ratio value of 0.25 is. ?
An oedometer test on a saturated clay soil gave the following results: Cc = 0.2 and Cs = 0.04. The in-situ vertical effective stress in the field is 130 kPa. A building foundation will increase the vertical stress in the center of the clay by 150 kPa. The thickness of the clay layer is 2 m and its water content is 28%. Calculate the primary consolidation settlement of the clay layer in the field if: a). OCR = 4.5; b). OCR = 1.5.
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