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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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
1. A 200 cm borehole log of a limestone is shown in Figure. Find the RQD and the core
recovery ratio. Classify the limestone according to RQD classification.
Core run total length - 200 cm
No
Recovery
5.25 cm
recovery
43 cm
18 cm
18 cm
29.5 cm
37.5 cm
10
Mechanical break
caused by drilling
No pieces > 10 cm
2. A rock core of limestone is 3 in. in diameter and 6 in. long is loaded to failure in an
confined compression testing machine. If the failure load P was 60,150 Ib, what is the
unconfined compression strength (UCS) o of the limestone sample? Calculate the UCS in
psi, kPa, and MPa. Classify the rock according to Deere & Miller, 1966
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- What is the rating of the rock under "Spacing of Discontinuities" parameter? The average joint frequency is 8 joints/m. This means that there are 8 joints or discontinuities found within a one meter of recovered rock. (A) 20 B) 8 15 10arrow_forward6. a) In an SPT test, the hammer entered the first 15 cm into a sandy soil with 10 blows. The next 15 cm was obtained with 2 blows and the last 15 cm was obtained with 3 blows. What is SPT value of this soil? Comment about the denseness of the soil. b) Calculate the Rock Quality Designation (RQD) value and comment on the quality of the given rock. 50cm 8cm cracked 11cm fractured 16сm 44cmarrow_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_forward
- 1. Triaxial compression tests are done on quartzite rocks, the results are shown below. (0₁+03)/2 -964.25 14500 19575 23200 29000 43210 63075 psi (01-03)/2 964.25 14500 18850 21750 26100 35960 48575 psi Comment on the applicability of each of the Mohr-Coulomb, Griffith, and Hoek-Brown criteria for the testing results.arrow_forwardQuestion 4 The porosity of a rock sample is 0.155, and its bulk volume is 85 cm. at the ground level at ambient conditions. The porosity of this sample drops by 20% at a depth of 12000 ft. Find the pore compressibility of this sample assuming constant temperature, given that the overburden pressure gradient is 0.96 psig/ft.arrow_forwardA core sample of granite was drilled at 1.5 m length at Muar. Based on the rock core (a) sample as shown in Figure Q3(a), determine the Total Core Recovery (TCR), Solid Core Recovery (SCR) and Rock Quality Designation (RQD). Q3arrow_forward
- Problem 1.1. Determine the rock names for coarse-grained rock samples with the following proportions of alkali feldspar, plagioclase, and quartz. B Alkali feldspar Plagioclase Quartz 0.55 0,37 0.1 0.22 0.36 0.49 0.23 0.27 0.41arrow_forward4. 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_forward
- A sandstone reservoir has an average thickness of 85 feet and a total volume of 7,650 acre-feet. A well was drilled and cored through the reservoir. A rock sample was sent to the laboratory and the following tests were run. The dry weight of the core sample was found to be 140 grams while the sample dimensions were 1.575 in. long and 1.960 in. in diameter. Assuming the compressibility at 4,500 psi is the average compressibility in the reservoir, how much subsidence occurs when the reservoir pressure declines from 5,500 psi to 3,500 psi? What is sample pore volume and porosity? Sandstone density is 2.65 g/cc. Pressure, psi Cumulative pore volume change (-cc) 1000 0.122 2000 0.162 3000 0.196 4000 0.224 5000 0.25 6000 0.273 7000 0.298 8000 0.315arrow_forwardQuestion 10 A 50 m run of core drilled horizontally from an underground drift allowed to recover 42 m ofrock core and 38 m of this core was in pieces longer than 100 mm. In the 4 m of recoveredrock core with pieces smaller than 100 mm, 2 meters contained fresh and sharp breaks(fractures).(a) Determine the Rock Quality Designation (RQD) value and the corresponding rock qualitydescription. (b) Describe the limitations of using RQD to evaluate rock quality and make suggestions onhow you can minimize the sources of error.arrow_forwardHome Work 1. Calculate the bulk volume of a preserved (paraffin-coated) core sample immersed in water, given the following data: Weight of dry sample in air: 20 g, Weight of dry sample coated with paraffin: 20.9 g (density of paraffin is 0.9 g/cc), Weight of coated sample immersed in water: 10 g (density of water is one g/cc). Determine the rock's porosity, assuming a sand-grain density of 2.67 g/cc. 2. Determine the sandstone's grain density and porosity, given the following data: Weight of crushed dry sample in air: 16 g, Weight of crushed sample plus absorbed water: 16.1 g, Weight of water-filled pycnometer: 65 g, Weight of water-filled pycnometer with the sample: 75 g.arrow_forward
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