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.
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.
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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- An undisturbed sample of clay loam has a saturated mass of 15 kg, a total volume of 0.008 m3. What is the porosity? Assume particle density of 2.65 g cm-3.arrow_forward1) A dry rock weighs 240 grams and has a bulk density of 2.5 grams per cubic centimeter. Whensaturated with pure water at room temperature (T = 25 °C), it weighs 255 grams. At room temperature,specific volume of water is 1.00295E-03 m3/kg. Calculate the porosity of the sample. 2) A cylindrical core sample of 1.5 cm length and 1.2 cm2cross-section has upstream and downstreampressures of 2 atm and 1.25 atm, respectively, during steady state flow of water at 1.00 g/s at roomtemperature. Calculate the permeability of the core. (Water @ 25 °C, viscosity = 1 cp, density of water = 0.997 g/cm3).arrow_forwardThe volume of the rock is found to be 0.00015 m^3. If the rock's specific gravity is 2.60, what is its weight in N?arrow_forward
- A petroleum reservoir has an areal extent of 20,000 ft2 and a pay zone thickness of 100ft. The reservoir rock has a uniform porosity of 35%. what is the pore volume of this reservoir?arrow_forward10 A clay layer having a thickness of 13.19 m. has an initial void ratio of 1.18. It is compressed and the void ratio changed to 0.88. Determine the reduction in thickness, in mm., of the clay layer. Round off to three decimal places. Input the numerical value only.arrow_forwardAn artesian aquifer 25-m thick has a porosity of 17% and bulk modulus ofcompression 2400 kg/ cm². Estimate the storage coefficient of the aquifer. Bulkmodulus of elasticity of water = 2.14 x 10¹ kg/cm².arrow_forward
- Absolute and effective porosity is a kind of measurement of porosity percentage in a reservoir rock, however, the distinguished point to separate them is depend on: Type of porosity Size of porosity connection between the pores None of thesearrow_forwardCalculate the saturated density from void ratio 0.8.arrow_forwardA petroleum reservoir has an areal extent of 0.56 acre and a pay zone thickness of 100 ft. The reservoir rock has a uniform porosity of 35%. What is the pore volume of this reservoir?arrow_forward
- Water depth in a lake is 3 m. A soil sample was collected from the sediment in the lake and the following properties are obtained.Calculate the following pressures at a depth of 12 m below the bed levelof the lake (assume the entire top clay layer is saturated):(A) The total pressure(B) The pore pressure(C) The intergranular pressurearrow_forwardWeight at 0kpa: 396 g Weight at -33kpa: 325 g Weight at -1500kpa: 291 g Weight at -3100kpa: 280g Weight at -1,000,000kpa: 273 g If we assume the soil core volume is 247cm^3, what is the bulk density in g/cm^3?arrow_forwardDetermine the value of void ratio if porosity 0.79arrow_forward
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