In a liquid limit test, using a cone penetrometer, the following readings were recorded. Moisture Content (%) Cone Penetration (mm) 32.26 14.4 41.92 16.4 51.96 18.2 64.52 21.2 72.76 22.3 Plastic Limit Test: Weight of wet soil + container 22.28 g Weight of dry soil + container 20.42 g Weight of container 13.39 g Natural Water Content: Weight of wet soil + container 17.69 g Weight of dry soil + container 14.84 g Weight of container 8.16 g Determine: A. Liquid Limit B. Plastic Limit C. Natural Water Content

In a liquid limit test, using a cone penetrometer, the following readings were recorded. Moisture Content (%) Cone Penetration (mm) 32.26 14.4 41.92 16.4 51.96 18.2 64.52 21.2 72.76 22.3 Plastic Limit Test: Weight of wet soil + container 22.28 g Weight of dry soil + container 20.42 g Weight of container 13.39 g Natural Water Content: Weight of wet soil + container 17.69 g Weight of dry soil + container 14.84 g Weight of container 8.16 g Determine: A. Liquid Limit B. Plastic Limit C. Natural Water Content

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.1CTP

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The data from a falling-head test on a silty clay are: Cross-sectional area of soil: 80 cm^2; Length of soil: 10 cm ;Initial head: 90 cm ; Final head : 84 cm ; Duration of test : 15 minutes ; Diameter of tube : 6 mm ; Temperature : 22C .Determine k a. 3.47 x 10^-2 b. 2.6 x 10^-6 c. 5.0 x 10^-2 d. 6.7 x 10^-1
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below the silt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface.The following data are available for both the silt and clay layers of soil.Silt layer: ?10 = 0.018 mm, e = 0.7, and Gs = 2.7Clay layer: e = 0.8 and Gs = 2.75Required: (a) Height of capillary rise, (b) capillary pressure, (c) the effective pressure at the ground surface, at groundwater table (GWT) level, at the bottom of the silt layer and at a depth of H =6 m below ground level, and (d) at a depth 2 m below ground level. (Sketch or draw the stress distribution diagram).
3. A civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions: a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretation
A civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions:a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretationc. Calculate 99% CI for the population mean μ. Write down your interpretationd. Explain why the size of CI changed between parts a - c
A course sand sample is placed in the constant permeameter test. Water passes through the sample water with a constant head of 40cm and after 0.00167hr, 40grams of water have been collected. What is the coefficient of permeability of the sand in cm/sec if the sample is placed inside a 166cm container with a 7.89cm radius?
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface. The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7 Clay layer: e = 0.8 and Gs = 2.75 Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, and (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface.The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7Clay layer: e = 0.8 and Gs = 2.75Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).
For a falling or variable head permeability test, the following are given: Length of soil specimen = 12 cm. Cross sectional area of stand pipe: A = 0.018 cm2 Diameter of soil specimen = 7.5 cm. Time of collection of water: t = 65 sec. Head difference at time t = 0; h1 = 70 cm. Head difference at time t = 65 sec; h2 = 40 cm. Temperature of water: 14 ֯C Find the absolute permeability of the soil at 20 ֯C.
The following data are from a direct shear test on an undisturbed soil sample. Represent the data by a Mohr Circle and compute the direction of principal planes. Normal pressure = 16.2 kN/m2; Tangential pressure = 14.4 kN/m2, Angle of internal friction = 24°; c = 7.2 kN/m2. a. 6.77 b. 26.25 c. 57 d. 38.77
A civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions:a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretation
Given data: Depth of Clay layer =4Depth of Sand layer=2unit weight of clay kN/m3=23unit weight of sand kN/m3 =21Ø in both layers=30C´= 0
Pressure (kN/m²)27 54 107 214 429 214 107 54 Void ratio1.243 1.217 1.144 1.068 0.994 1.001 1.012 1.024 The table above shows results obtained from an oedometer test on a specimen of saturated clay. A layer of this clay 2.5 m thick lies below a 10 m depth of sand, the water table being at the surface. The saturated weight for both soils is 19 kN/m³. A 10-m depth of fill of unit weight of 21 kN/m³ is placed on the sand over an extensive area. If the fill was to be removed some time after the completion of consolidation, what heave (mm) would eventually take place due to swelling of the clay? (0 d.p). Use unit weight of water of 9.8 kN/m3. Use log base 10.

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Moisture Content (%)	Cone Penetration (mm)
32.26	14.4
41.92	16.4
51.96	18.2
64.52	21.2
72.76	22.3

Plastic Limit Test:
Weight of wet soil + container	22.28 g
Weight of dry soil + container	20.42 g
Weight of container	13.39 g
Natural Water Content:
Weight of wet soil + container	17.69 g
Weight of dry soil + container	14.84 g
Weight of container	8.16 g