This example is unusual as it relies upon the understanding of the Mohr circle properties. A sample of clay was subjected to an undrained triaxial test with a cell pressure of $100k\frac{N}{m}2$ and the additional axial stress necessary to cause failure was found to be $188k\frac{N}{m}2.$

Assuming that phi $=0,$ determine the value of additional axial stress that would be required to cause failure of a further sample of the soil if it was tested undrained with a cell pressure of $200k\frac{N}{m}2.$ Graph paper is required.