   # A smooth vertical wall retains a clay backfill with c ′ = 10 kN/m 2 , ϕ ′ = 25 ° , and γ = 19.0 kN/m 3 . If the clay is in active state, determine the following: a. The maximum tensile stress within the clay b. The depth of the tensile cracks ### Fundamentals of Geotechnical Engin...

5th Edition
Braja M. Das + 1 other
Publisher: Cengage Learning
ISBN: 9781305635180

#### Solutions

Chapter
Section ### Fundamentals of Geotechnical Engin...

5th Edition
Braja M. Das + 1 other
Publisher: Cengage Learning
ISBN: 9781305635180
Chapter 14, Problem 14.6P
Textbook Problem
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## A smooth vertical wall retains a clay backfill with c′ = 10 kN/m2, ϕ ′ = 25 ° , and γ = 19.0 kN/m3. If the clay is in active state, determine the following:a. The maximum tensile stress within the clayb. The depth of the tensile cracks

(a)

To determine

Find the maximum tensile stress within the clay.

### Explanation of Solution

Given information:

The cohesion (c) of the clay backfill is 10kN/m3.

The drained angle (ϕ) of friction is 25°.

The unit weight (γ) of the clay is 19.0kN/m2.

Calculation:

Find the active earth pressure coefficient (Ka) using the equation:

Ka=tan2(45ϕ2)

Substitute 25° for ϕ.

Ka=tan2(4525°2)=0

(b)

To determine

Find the depth of the tensile cracks.

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