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Design of Sheet Pile Wall-US Army


Quiz Questions

1.An Anchored wall is A sheet pile wall which derives its support from a combination of interaction with the surrounding soil and one (or more) mechanical devices which inhibit motion at an isolated point(s). The design procedures described in this manual are limited to a single level of anchorage.
True
False
2. Factor of safety for rotational failure of the entire wall/soil system (mass overturning) is the ratio of available resisting effort to driving effort.
True
False
3.Structural material factor of safety is the ratio of limiting stress (usually yield stress) for the material to the calculated stress.
True
False
4.Cantilever walls are usually used as floodwall or as earth retaining walls with low wall heights (10 to 15 feet or less). Because cantilever walls derive their support solely from the foundation soils, they may be installed in relatively close proximity (but not less than 1.5 times the overall length of the piling) to existing structures.
True
False
5.An anchored wall is required when the height of the wall exceeds the height suitable for a cantilever or when lateral deflections are a consideration. The proximity of an anchored wall to an existing structure is governed by the horizontal distance required for installation of the anchor
True
False
6.The designer must consider the possibility of material deterioration and its effect on the structural integrity of the system. Most permanent structures are constructed of steel or concrete. Concrete is capable of providing a long service life under normal circumstances but has relatively high initial costs when compared to steel sheet piling.
True
False
7.Wood sheet pile is suitable as a permanent or long-term structure.
True
False
8.The purpose of the geotechnical investigation for wall design is to identify the type and distribution of foundation materials, to identify sources and characteristics of backfill materials, and to determine material parameters for use in design/analyses.
True
False
9.The geotechnical investigation program should be laid out by a geotechnical engineer familiar with the project and the design of sheet pile walls. The exploration program should be coordinated with an engineering geologist and/or geologist familiar with the geology of the area.
True
False
10.The loads governing the design of a sheet pile wall arise primarily from the soil and water surrounding the wall and from other influences such as surface surcharges and external loads applied directly to the piling.
True
False
11.Earth pressures reflect the state of stress in the soil mass. The concept of an earth pressure coefficient, K, is often used to describe this state of stress. The earth pressure coefficient is defined as the ratio of horizontal stresses to the vertical stresses at any depth below the soil surface:
True
False
12. Active soil pressure is the minimum possible value of horizontal earth pressure at any depth. This pressure develops when the walls move or rotate away from the soil allowing the soil to expand horizontally in the direction of wall movement.
True
False
13.A difference in water level on either side of the wall creates an unbalanced hydrostatic pressure.
True
False
14.Lateral soil and/or water pressures exerted on the wall tend to cause rigid body rotation of a cantilever or anchored wall as illustrated in Figure 5-2. This type of failure is prevented by adequate penetration of the piling in a cantilever wall or by a proper combination of penetration and anchor position for an anchored wall.
True
False
15.Analysis by the classical methods of a wall with a penetration greater than that required for stability indicates not only an increase in the factor of safety but attendant increases in soil pressures, bending moments, anchor forces, and deflections as well. While the increased deflections are consistent with the assumptions in the classical procedures, an increase in penetration should be expected to result in reduced deflections.
True
False