5. Point load tests were carried out on two sedimentary rock speci- mens of 54 mm diameter (NX core), as shown the following figure The loads P and P, at failure are 6.28 kN and 4.71 kN, respectively. Find the point load strength index I(50) in the two directions and compute the point load strength anisotropy index Ia(50). Q.PH 30 mm ↓ TP₁ 1P₁ 60 mm

5. Point load tests were carried out on two sedimentary rock speci- mens of 54 mm diameter (NX core), as shown the following figure The loads P and P, at failure are 6.28 kN and 4.71 kN, respectively. Find the point load strength index I(50) in the two directions and compute the point load strength anisotropy index Ia(50). Q.PH 30 mm ↓ TP₁ 1P₁ 60 mm

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.23P

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2. Ten point load tests are carried out on cylindrical specimens of a sedimentary rock with 30 mm diameter, as shown in the figure. 50 mm The failure loads of these tests are equal to: 3.2, 4.1, 3, 3.8, 2.9, 4.2, 3.5, 3.6, 3.5 and 4 kiloNewtons. Determine Iyso of this rock. Predict the uniaxial compressive strength of this rock.
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a) Following results are obtained in a series of CU triaxial tests on saturated samples of a clay. Calculate the effective shear strength parameters (c' and ') and plotting the Mohr- Coulomb failure envelope. (Hint: you can first plot the top points of the circles in q=(01-03)/2 vs. p=(₁03)/2 space.) Test number Confining (cell) Pressure (kPa) Deviator stress (01-03) (kPa) Pore pressure before shear (kPa) Pore water pressure at failure (kPa) ● 1 400 120 300 320 2 400 210 200 260 3 550 270 250 235 b) If we carry out a consolidated drained triaxial test on a specimen taken from the same clay (assume same c', '), what would be the deviator force at failure in a specimen that is consolidated under an isotropic stress of 240 kPa and pore pressure of 300 kPa. The specimen was initially 5 cm in diameter and 10 cm in height. Peak strength (i.e. failure) is reached at axial strain of 4% and volumetric strain of 2% in compression. Hints: the pore pressure is initial pore water pressure
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answer in ccomplete sol
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