Example

A smooth backed vertical wall is 6 m high and retains a soil with a bulk unit weight of 20kN/m3 and <f>' = 20°. The top of the soil is level with the top of wL

Fig. 6.10 Line load effect (after Code of Practice for Earth retaining structures (CP2), 1951).

Fig. 6.11 Culmann line construction for a line load.

the wall and its surface is horizontal and carries a uniformly distributed load of 50kN/m2. Using the Rankine theory determine the total active thrust on the wall/linear metre of wall and its point of application.

Solution

Figure 6.12a shows the problem and Fig. 6.12b shows the resultant pressure diagram.

Using the Rankine theory: l-sin^

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