airports do not need air traffic controllers if the skies are clear.
How does Polk feel about his job as an air controller?
Check the correct pair of opposites
About retaining walls , it is not correct to say that
The word "backfill" (first paragraph) means
"Each of these walls must be designed to resist the external forces applied to the wall from earth pressure, surcharge load, water, earthquake etc."
According to the sentence above, one can deduce that
1. designing any retaining wall requires knowledge of lateral earth pressure.
2. retaining wall design is an iterative method.
3. it is common for walls to be designed with adequate drainage to prevent water from accumulating behind the wall and producing large additional forces.
Which of th...
The best translation of "Lateral pressure varies linearly with depth and the resultant pressure is located onethird of the height (H) above the base of the wall." Is
Consider these statements about Rankine Theory.
I. It assumes that the wall is frictionless and the soil is cohesionless, the force is parallel to the backfill surface.
II. It assumes that the ground and failure surfaces are straight planes.
III. It assumes that the friction between soil and wall is of no consequence.
Which of them is correct?
Choose the right alternative to complete respectively the blanks in the paragraph.
Since the Theory assumes that there is no soil wall friction, the force (Pa) is ____________ to the backfill surface. On the other hand, since the Theory takes the soil wall friction into consideration, the force (Pa) acts at an angle of from the to the wall. This results in both a vertical and horizontal component of the force (Pa).
According to the text, it is correct to say that Rankine method is
