An unconfined compression (UC) test was conducted on a 50-mm-diameter and 100-mm-high cylindrical sample of silty clay (Gs=2.70). The total mass of the soil sample was 402.52 g. The sample, which was assumed to be fully saturated at the time of the test, failed at an axial load of 318 N at an axial displacement of 7.15 mm. (a) Calculate the total axial stress at failure. (b) Calculate the undrained shear strength of the sample. (c) If it is previously known that the angle of friction is equal to 22° for the silty clay, estimate the effective horizontal stress and pore-wate) pressure at failure. (d) Post-test gravimetric water content of the sample (w) was found to be 19.3%. Does this measured value of w affect the interpretation of your test results? If it does, in what way(s) and why?

An unconfined compression (UC) test was conducted on a 50-mm-diameter and 100-mm-high cylindrical sample of silty clay (Gs=2.70). The total mass of the soil sample was 402.52 g. The sample, which was assumed to be fully saturated at the time of the test, failed at an axial load of 318 N at an axial displacement of 7.15 mm. (a) Calculate the total axial stress at failure. (b) Calculate the undrained shear strength of the sample. (c) If it is previously known that the angle of friction is equal to 22° for the silty clay, estimate the effective horizontal stress and pore-wate) pressure at failure. (d) Post-test gravimetric water content of the sample (w) was found to be 19.3%. Does this measured value of w affect the interpretation of your test results? If it does, in what way(s) and why?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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Question

An unconfined compression (UC) test was conducted on a 50-mm-diameter and 100-mm-high cylindrical sample
of silty clay (Gs=2.70). The total mass of the soil sample was 402.52 g. The sample, which was assumed to be
fully saturated at the time of the test, failed at an axial load of 318 N at an axial displacement of 7.15 mm.
(a) Calculate the total axial stress at failure.
(b) Calculate the undrained shear strength of the sample.
(c) If it is previously known that the angle of friction is equal to 22° for the silty clay, estimate the effective
horizontal stress and pore-water pressure at failure.
(d) Post-test gravimetric water content of the sample (w) was found to be 19.3%. Does this measured value of w
affect the interpretation of your test results? If it does, in what way(s) and why?

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This is not a graded question. Please solve.
The value of x is 8