Chapter 14, Problem 14.14P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

The elevation and plan of a bracing system for an open cut in sand are shown in Figure 14.21. Using Peck’s empirical pressure diagrams, determine the design strut loads. Given: γ_{sand} = 18 kN/m^{3}, *ϕ'* = 38°, *x* = 3 *m*,* z =* 1.25 m, and *s* = 3 m.

To determine

Find the design strut loads by using the Peck’s empirical pressure.

Explanation

**Given information:**

The unit weight

The soil friction angle

The depth *z* is 1.25 m.

The depth *x* is 3.0 m.

The depth *s* is 3.0 m.

**Calculation:**

Determine the height (*H*) of the bracing system using the relation.

Substitute 1.25 m for *z*, 3.0 m for *x*, and 3.0 m for *s*.

Determine the maximum pressure intensity

Substitute *H*, and

Draw the diagram of level *A* to *B* as in Figure 1.

Refer Figure 1.

Determine the reaction at level *A* by taking moment about level *B*.

Substitute *x*, and 1.25 m for *z*.

Draw the sketch of level *B* to *C* as in Figure 2.

Refer Figure 2.

Determine the reaction at level

Substitute *x*, 1.25 m for *z*, and *A*.

Determine the reaction

Substitute *x*.

Draw the sketch of level *C* to *D* as in Figure 3.

Refer Figure 3.

Determine the reaction at level *D* by taking moment about level *C*.

Substitute

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