Question

In a soil specimen, the total stress, effective stress, hydraulic gradient and critical hydraulic gradient are $\sigma ,{\sigma }^{\prime },$ $i$ and $i_c$ respectively. For initiation of quick sand condition, which one of the following statement is TRUE?

• A. ${\sigma }^{\prime }\ne 0andi=i_c$
• B. $\sigma =0andi=i_c$
• C. ${\sigma }^{\prime }\ne 0andi\ne i_c$
• D. ${\sigma }^{\prime }=0andi=i_c$

Answer 1

The correct option is D ${\sigma }^{\prime }=0andi=i_c$

During quick sand condition, the effective stress is reduced to zero $[i.e,{\sigma }^{\prime }=0$]