Question

A vane-shear test was performed at the botiom of a borehole drilled in a fine-grained (clay) deposil, using a 2.0-in. vane ( $D=2.0$ in. of $50.8 \mathrm{~mm}, \mathrm{H}=40 \mathrm{in}$. or $101.6 \mathrm{~mm}$ ). In the undisturbed condition, the measured torque (soil resistance) was $36 \mathrm{~N}$-m. A torque resistance of $9.5 \mathrm{~N}$-m was recorded for the subsequent rotation used to determine the remolded shear streagth. (a) Inflicate the value for the test-determined (uncorrected) undisturbed, undrained soil shear strength (or cohesion), the remolded shear strength, and the clay sensitivity. (b) Samples of the soil tested in a laboratory indicate the plasticity index, P1, is 62 . Indicate the corrected undisturbed, undrained shear strength value to use for analysis and design purposes. The test depth was $7 \mathrm{~m}$. and the preconsolidation stress was determined to be $260 \mathrm{kPa}$.

   A vane-shear test was performed at the botiom of a borehole drilled in a fine-grained (clay) deposil, using a 2.0-in. vane ( $D=2.0$ in. of $50.8 \mathrm{~mm}, \mathrm{H}=40 \mathrm{in}$. or $101.6 \mathrm{~mm}$ ). In the undisturbed condition, the measured torque (soil resistance) was $36 \mathrm{~N}$-m. A torque resistance of $9.5 \mathrm{~N}$-m was recorded for the subsequent rotation used to determine the remolded shear streagth.
(a) Inflicate the value for the test-determined (uncorrected) undisturbed, undrained soil shear strength (or cohesion), the remolded shear strength, and the clay sensitivity.
(b) Samples of the soil tested in a laboratory indicate the plasticity index, P1, is 62 . Indicate the corrected undisturbed, undrained shear strength value to use for analysis and design purposes. The test depth was $7 \mathrm{~m}$. and the preconsolidation stress was determined to be $260 \mathrm{kPa}$.
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Essentials of soil mechanics and foundations : basic geotechnics
Essentials of soil mechanics and foundations : basic geotechnics
David F. McCarthy 7th Edition
Chapter 11, Problem 32 ↓

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Given: Torque resistance in undisturbed condition = 36 N-m Area of vane = $\pi \left(\frac{D}{2}\right)^2 = \pi \left(\frac{2.0}{2}\right)^2 = \pi \times 1 = 3.1416 \mathrm{~in}^2$ Undisturbed, undrained shear strength = $\frac{\text { Torque resistance }}{\text {  Show more…

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A vane-shear test was performed at the botiom of a borehole drilled in a fine-grained (clay) deposil, using a 2.0-in. vane ( $D=2.0$ in. of $50.8 \mathrm{~mm}, \mathrm{H}=40 \mathrm{in}$. or $101.6 \mathrm{~mm}$ ). In the undisturbed condition, the measured torque (soil resistance) was $36 \mathrm{~N}$-m. A torque resistance of $9.5 \mathrm{~N}$-m was recorded for the subsequent rotation used to determine the remolded shear streagth. (a) Inflicate the value for the test-determined (uncorrected) undisturbed, undrained soil shear strength (or cohesion), the remolded shear strength, and the clay sensitivity. (b) Samples of the soil tested in a laboratory indicate the plasticity index, P1, is 62 . Indicate the corrected undisturbed, undrained shear strength value to use for analysis and design purposes. The test depth was $7 \mathrm{~m}$. and the preconsolidation stress was determined to be $260 \mathrm{kPa}$.
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