In an oedometer test on a $2$cm thick sample, the following set of data was recorded under

constant stress of $800$ kPa:

t $($min$)12481530601202404809601440$

e $0\mathrm{.}88210\mathrm{.}88140\mathrm{.}88040\mathrm{.}87930\mathrm{.}87780\mathrm{.}87550\mathrm{.}87230\mathrm{.}8690\mathrm{.}8670\mathrm{.}8660\mathrm{.}86550\mathrm{.}865$

a$)$ Calculate coefficient of consolidation by Casagrande$$s method.

b$)$ Calculate coefficient of consolidation by Taylor$$s method. $($Do not be confused if the

answer is different from the answer in part a$)$

Void ratios at the end of the other load increments for this test are:

c$)$ Find preconsolidation pressure $($maximum past effective stress$),$ by Casagrande$$s method.

d$)$ Find preconsolidation pressure $($maximum past effective stress$),$ by Strain Energy method.

e$)$ Calculate compression index $,$ compression ratio $,$ recompression$/$reload index and reload

ratio. Assume the clay was normally consolidated in its natural state before sampling. $($Note

that when you plot the stress axis in log$-$scale, the numbers written on the axis are actual

stress values. So you still need to take their log in slope calculations$)$

please could you solve the all parts