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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ s ~ ~ ~ ~ <br />P Q DIAGRAM <br />(EFFECTIVE STRESSES) <br />1000 <br />900 <br />600 <br />200 <br />Q 600 <br />k soo <br />P <br />a 4oo <br />300 <br />200 <br />I00 <br />0 <br />0 200 400 600 800 1000 1200 1400 <br /> EFF. P kPa <br />INTACT SHEAR ~ 1st STAGE 20ps1 ~ 2nd STAGE 40ps1 X 3~d STAGE 60psi <br />1600 1800 <br />.~. i <br />