Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 3, Problem 3.6P
To determine
Find the porosity of the rock.
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A large piece of dry rock has a mass of 2450 kg and volumeof 0.925 m3. The specific gravity of the rock mineral is 2.80.Determine the porosity of the rock.
Calculate the porosity of a rock that is 50% Quartz,
50% Muscovite, and that has a bulk density of 2.00
3
g/cm when saturated with water. (Density of quartz
= 2.65 g/cm³; density of Muscovite = 2.85 g/cm³).
Find the weight of a 1.2 m3 dry rock mass, having a porosity of 1%. The specific gravity of the rock mineral is 2.69.
Chapter 3 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- A cubic meter of dry (no water) quartz sand (G, = 2.65) with a porosity of 60% is immersed in an oil bath having a unit weight of 0.92 g/cm³. How much force in addition to the upthrust (buoyant force) is required to prevent the sand from sinking if the soil contains 0.27m³ of entrapped air after submergence?arrow_forwardFind the value of void ratio Porosity=0.712arrow_forwardQUESTION 4aTo use rock in engineering applications, certain properties of the rock mass must be assessed to reasonably predict performance in the as-built condition. Discuss the following in the field of rock performance i. Discontinuityii. Elastic deformationiii. Plastic deformationarrow_forward
- A cubic rock sample has the following dimensions: 33 cm x 12 cm x 24 cm. If the porosity of the rock sample is 11%, calculate the rock sample pore vaiume.arrow_forward2. Refer to figure 8.16. Calculate o, u, o'at A, B, C, and D for the following cases and plot the variations with depth. (Note: e = void ratio, w =moisture content, Gg = specific gravity of soil solids, Ya = dry unit weight, and ysat = saturated unit weight.) н, 3 1.5 т Ya = 17.6 kN/m³ H2 = 1.83 m Ysat = 18.87 kN /m³ H3 = 2.44 m 19.65 kN /m3 Ysat =arrow_forwardHomework 1: a sample of rock has a total mass of 300 gm and a dry mass of 250 gm with a real specific weight of 2.77 and a degree of saturation of 80%. Find the following: Total volume, volume of sold particles, volume of voids, total density, dry density, void ratio, porosity, moisture content.arrow_forward
- A rock with 4% water absorption by weight has a dry weight of 656 g, a degree of saturation of 27%, Its weight in water is 415.45 g and its specific gravity is 2.72. This rock; a) Apparent and total porosity b) Natural and grain unit volume weight c) water content calculate.arrow_forwardQuestion 4.5 A rock sample has a length of 20.32 cm and a diameter of 5 cm. The pressure profile inside the core sample is given below, where nitrogen of viscosity 0.0178 cP is flowing at a constant rate of 55 cm³/s. What is the permeability of the sample if the flow is in accordance with Darcy's law? 450 400 350 - 300 250 - P [psig] 200 150 100 - 50 1 3. 4 7 8 9. Distance from inlet [in] 6arrow_forward1.)This type of rock is formed by the process of changing the composition and texture of rocks (without melting) by heat and pressure. 2.) What is the term for the soil particle with microscopic soil fractions that consist of very fine quartz grains and some flake-shaped particles that are fragments of micaceous minerals.arrow_forward
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