The figure shows CT scan images of two PPI soft clay samples (left and center) and a standard U75 sample (right).
The figure below is an extract from the technical paper “Performance Of An Innovative Direct-Push Piston Sampler in Soft Clay”, by Dr Jubert A.Pineda, Allan McConnell and Dr Richard Kelly, presented at the 3rdInternational Symposium on Cone Penetration Testing, Las Vegas, Nevada, USA –2014. Download scientific diagram Photos of samples under different conditions (a) disturbed sample after air-dried (b) obtaining an undisturbed soil sample in. If all condition meets during collection of samples from bore hole, during removal of this sample produces change in stress as conditions and get disturbed. It is a theoretical term as some disturbance is unavoidable. then totally eliminates tension in the sampled material inside the tube as the sampler is withdrawn from the ground. Undisturbed sample The samples that retains its natural water content and structure of soil are known as undisturbed samples.then cuts the sample free from the soil mass.first captures the sample in the normal fixed-piston manner.This is a thin-walled fixed piston sampler developed by IGS that: For this test the soil specimen should have water content greater than liquid limit. Shrinkage Limit Test: This is one of the Atterberg Limit test to find out the shrinkage limit of the soil. Typically, it is used for sampling for high quality laboratory strength and compressibility testing. Concept: Hydrometer Test: This is used to determine the particle size distribution of fine-grained soils passing 75 µ sieve.For this test both disturbed and undisturbed soil sample can serve the purpose. This sampler is used for undisturbed sampling of very soft to firm cohesive soils, sediments and fine-grained tailings.
Disturbed undisturbed soil samples iso#
In accordance with BS EN ISO 22475-1 PPI samples are Category A, Class 1 – thin-walled undisturbed sampler. Samples are about 800mm long and are arguably as close to undisturbed sampling as you will get by any means other than research-level block sampling.
We have two sizes available, 63 or 75mm diameter. The PPI (Piston Pneumatic Injection) sampler is our flagship sampler.