Question $21$

If $H1=5\mathrm{.}7m,$ what will be the time $($in years$)$ taken to achieve an average Degree of Consolidation $($Uv$)$ of $90\%$ for Clay A$?$

Question $22$

If $H2=6\mathrm{.}0m,$ what will be the time $($in years$)$ taken to achieve an average Degree of Consolidation $($Uv$)$ of $90\%$ for Clay B$?$

Question $23$

What will be the corresponding ground surface settlement $($in $m)$ due to Clay $A$ if $H1=4\mathrm{.}4m?$

Question $24$

What will be the corresponding ground surface settlement $($in $m)$ due to Clay $B$ if $H2=5\mathrm{.}2m?$

If H$1$ and H$2$ are now fixed at $10$m and $8$m$,$ respectively, what is the TOTAL settlement $($in m$)$ experienced by Clays A and B$?$

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For H$1=10$m and time $=3$ years, what will be the average degree of consolidation $($Uv$$in $\%)$ of Clay A$?$

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Hint: Calculate Tv$$first then find Uv$$from Figure.

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For H$2=8$m and time $=3$ years, what will be the average degree of consolidation $($Uv$$in $\%)$ of Clay B$?$

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Hint: Calculate Tv$$first then find Uv$$from appropriate Chart

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For H$1=10$m and H$2=8$m$,$ if time of $3$ years is desired to achieve average Uv of $90\%$ for both Clay A and Clay B$,$ what will be the additional required surcharge pressure $($p$)($in kN$/$m$2)?$

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Hint; Use the formula:$$Total sett,$$H $=$ UA$*($mv$*$H$*\backslash$sigma v$\text{'})$clay A$+$ UB$*($mv$*$H$*\backslash$sigma v$\text{'})$clay B

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Continuing from above, if BOTH the sand used as permanent fill$$and$$surcharge$$has a bulk unit weight,$\backslash$gamma s of $18\mathrm{.}3$ kN$/$m$3,$ what will be the total permanent fill $+$ surcharge height $($in m$)?$

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Based on a $9-$month accelerated ground improvement program where sand drains willl be installed for Clay A only with Uv$=0\mathrm{.}28,$ determine Uh$($in $\%)$ if the Combined Degree of Consolidation $($Uv$,$h$)$ is given as $0\mathrm{.}9.$

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$[$Hint: use Carillo's Theorem$]$

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For a $9-$month ground improvement program with sand drain diameter Dw$=0\mathrm{.}5$m$,$ find Tw$($dimensionless$)$ for Clay A$,$ knowing that radial consolidation will occur.

Note: Subscript $\text{'}$w$\text{'}$ means 'well' or 'drain'. Can be used interachangeably without altering the meaning.

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Based on question above, use the appropriate Chart provided to determine the dimensionless value of n $(=$ De$/$Dw$).$

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From the question above, what is the equivalent diameter or tributary drain spacing, De$($in m$)$ for the proposed ground improvement work to work?

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What would the square grid spacing $($in m$)$ be if the Client were to request for it$?$