PE Civil Practice: Which side shows active earth pressure?

NCEES Civil PE Specification Analysis of Structures–Loads and Load Applications: Earth Pressure and Surcharge Loads

Problem

In the provided figure, there are two sides of the retaining wall labeled as A and B. Which of the following statements is true regarding the pressure exerted on these sides?

Select an Answer:

A) Side A exhibits active pressure, while side B demonstrates passive pressure
B) Side B showcases active pressure, whereas side A displays passive pressure.
C) Both sides A and B experience passive pressures.
D) Both sides A and B are subjected to active pressures.

% Students Correctly Answered:

85.6%

Solution

Refer to PE Civil Reference Handbook V2.0, Section 3.1.2

Refer to PE Structural Engineering Reference Handbook V1.0, Section 3

The concept of active and passive pressure is related to the lateral pressure exerted by the soil against the retaining wall. These pressures are influenced by the movement and behavior of the soil.

Active Pressure: This type of pressure occurs on the side of the retaining wall where the soil tends to move away from the wall. It happens when the retained soil pushes the wall, trying to move or overturn it. Active pressure is generally seen on the side where soil is not restrained and has room to move or expand.

Passive Pressure: Passive pressure occurs on the opposite side of the active pressure. This pressure develops when the soil is constrained or resisting movement, pressing against the wall. It provides support to the wall, counteracting the forces exerted by the soil.

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Practice Question: Which side shows active earth pressure?

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