Q$\mathrm{.}2.$ An undisturbed soil sample was brought from a construction site to Laboratory and two identical specimen of the soil were prepared and tested in tri$-$axia? test apparatus. First specimen failed at a deviator stress of $770k\frac{N}{m^2}$ when the cell pressure was $200k\frac{N}{m^2},$ while the second specimen failed at a deviator stress of $1370k\frac{N}{m^2}$ under a cell pressure of $400k\frac{N}{m^2}.$ Find shear strength parameters analytically

$20$