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QUESTION

Objective Question

Q.1
A masonry dam is founded on pervious sand a factor of safety of 4 is required against boiling. For the sand, n = 45% and Gs = 2.65. The maximum permissible upward hydraulic gradient will be nearly 
एक मेसनरी डैम पारगम्य रेत पर बना है, उबलने से बचाने के लिए 4 का सेफ्टी फैक्टर ज़रूरी है। रेत के लिए, n = 45% और Gs = 2.65। ज़्यादा से ज़्यादा ऊपर की ओर जाने वाला हाइड्रोलिक ग्रेडिएंट लगभग होगा।
A
0.18
B
0.23
C
0.28 
D
0.33 
Answer ( Option B)

0.23

Solution

Gs = 2.65 

n = 45% = 0.45 

 

Critical hydraulic gradient (icr) =  

 

 

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