A 3-ft-thick (measured vertically) veneer of residual soil overlies a long rock slope inclined at 28 degrees above the horizontal. During a period of prolonged rainfall, the soil slide down the slope when the free water surface in the residual soil was 2 ft above the rock (measured vertically). The total unit weight of the soil above and below the free water surface was about 132 pcf. Determine possible combinations of effective stress cohesion intercept (c') and effective stress friction angle (o') at the soil-rock interface consistent with the failure. Plot these values on a diagram showing that, as o' increases, c' decreases, for conditions corresponding to failure.

A 3-ft-thick (measured vertically) veneer of residual soil overlies a long rock slope inclined at 28 degrees above the horizontal. During a period of prolonged rainfall, the soil slide down the slope when the free water surface in the residual soil was 2 ft above the rock (measured vertically). The total unit weight of the soil above and below the free water surface was about 132 pcf. Determine possible combinations of effective stress cohesion intercept (c') and effective stress friction angle (o') at the soil-rock interface consistent with the failure. Plot these values on a diagram showing that, as o' increases, c' decreases, for conditions corresponding to failure.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.12P: Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below...

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A 3-ft-thick (measured vertically) veneer of residual soil overlies a long rock slope inclined at 28
degrees above the horizontal. During a period of prolonged rainfall, the soil slide down the slope
when the free water surface in the residual soil was 2 ft above the rock (measured vertically). The
total unit weight of the soil above and below the free water surface was about 132 pcf.
Determine possible combinations of effective stress cohesion intercept (c') and effective stress
friction angle (o') at the soil-rock interface consistent with the failure. Plot these values on a
diagram showing that, as o' increases, c' decreases, for conditions corresponding to failure.

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