Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 17, Problem 17.15P
To determine
Find the recovery ratio and the rock quality designation and comment on the quality of rock.
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Please answer 17.10
1) 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).
A rock sample was subjected to point load test as shown, if the sample 50 mm diameter and
100 length and the load at rupture about 2.20KN, The point load index
L>0.7 D
T
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Q3 (a) A core sample of granite was drilled at 1.5 m length at Muar. Based on the rock core sample as shown in Figure Q3(a), determine the Total Core Recovery (TCR), Solid Core Recovery (SCR) and Rock Quality Designation (RQD).arrow_forwardA rock stratum was cored for a length of 1.00m(i.e., length of core advance). Total length of the recovered core was0.75 m. Total length of the recovered pieces which are 100 mm or larger was 0.60 m. Determine:(a) The rock recovery ratio (RRR) and the rock quality.(b) The rock quality designation (RQD) and the rock quality.(c) An approximate value for the reduced field modulus of elasticity (Ef) of the rock if its laboratory modulusof elasticity (Elab) is 20 000 MPa.arrow_forwardQ5 aarrow_forward
- 4. The uniaxial compressive strength test is done on a cylindrical rock specimen with diameter of 60 mm and length of 120 mm. The load- deformation diagram of this specimen is shown on the following figure. Determine the uniaxial compressive strength and the secant Young modulus (E50) of this rock. 80000 70000 60000 50000 40000 30000 20000 10000 0.5 1 1.5 Deformation (mm) Load (N) 2.arrow_forwardA cylindrical rock sample has a porosity of 27%. The dimensions of the core are 15 cm in length and 5.6 cm in diameter. Calculate the pore volume.arrow_forwardreservior rock and fluid propertiesarrow_forward
- Data from an oedometer test using a clay specimen are plotted in the graph shown below. If the compression index is equal to 0.6, calculate the void ratio (e2) missing at Point C, which is associated with a vertical effective stress equal to 105 kPaarrow_forwardI need the answer as soon as possiblearrow_forward2. How to evaluate the rock properties according to the distribution curves and give at least two coefficients of that.arrow_forward
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