PORE PRESSURE VARIATION IN LOOSE SOIL WITH DEPTH PORE PRESSURE VARIATION IN LOOSE SOIL WITH DEPTH GAURAV KHANDELWAL (Civil/Environmental) (OP) 17 Oct 17 20:03 is it possible to get negative pore pressure in loose cohesive soil in CPT test??? RE: PORE PRESSURE VARIATION IN LOOSE SOIL WITH DEPTH LRJ (Civil/Environmental) 18 Oct 17 09:06 It depends on how you define 'loose'. What are the stresses? For that matter, what is 'loose cohesive soil': cohesive soil isn't usually characterised by its density (that's for cohesionless soil). Whether or not something will contract or dilate depends on what side of the critical state line you are. Generally you wouldn't expect 'loose' soil to dilate, but the stresses and critical state line are the other factors to consider. RE: PORE PRESSURE VARIATION IN LOOSE SOIL WITH DEPTH fattdad (Geotechnical) 18 Oct 17 12:59 yes. f-d ípapß gordo ainÆt no madre flaca! RE: PORE PRESSURE VARIATION IN LOOSE SOIL WITH DEPTH geotech_ben (Geotechnical) 25 Oct 17 00:54 Just as precation, are you installing driven piles? Negative pore water pressures on a CPT is a red flag for pile design. Negative pore water pressures can be indicative of a pile relaxing and losing capacity! Perform a load test after a couple of weeks to ensure the capacity at EOD is maintained.