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Question
The foundation soil at the toe of a dam has a void ratio of 0.69. The specific gravity of soil grains is 2.62. For safety against piping the upward gradient must not exceed 29% of the value at which quick condition occurs. The maximum permissible upward gradient is:
A.
0.287
B.
0.872
C.
1.463
D.
0.278
Answer ( Option D)

0.278

Solution

Given -
e = 0.69
G = 2.62
Given that for safety against piping the upward gradient must not exceed 29% of the value at which quick condition occurs.
Hence, i = 0.29 × 0.9585
            i = 0.278
 

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