Unformatted text preview: much load on piston may compress sample during push. These samplers can be very expensive & complicated (e.g. foil sampler). Shelby tube modifications sometimes include a piston. Can get very high quality samples (e.g. Osterberg sampler). (Figure from Bowles, 1996) u.rFiud piston Thin-walled sampling tube Beainoina operation Thin-walled Top piston is (ully advanced and sample (e) tube can be recovered Typic:aI pl~ton ~plers. ~a) Sta~onary piston sampler for recovery of "undisturbed" samples of . . cohesive SOI~. Piston rcmams stationary on soil and tube is pushed into the soil; piston is then clamped and sample IS recovered; (b) Swedish foil sampler; (e) Osterberg piston sampler. (Hl'onlev (/949))....
View Full Document
- Fall '08
- break, Nyquist–Shannon sampling theorem, Sampler