DO QUESTION B$,$ IDK HOW TO DO B

a$)$ Three samples of a soil have been tested under consolidated undrained conditions in a triaxial cell using a constant back pressure of $100$ kPa at the consolidation stage under isotropic stress conditions. Details of the test are found in the table below.

Estimate the effective shear strength parameters.

$(10$ marks$)$

b$)$ Draw the stress path and effective stress Mohr circles that most closely simulate $(1)$ the initiation of rainfall$-$induced landslides and, $(2)$ static liquefaction in contractive sandy soils.

$(5$ marks$)$