procedure for split-spoon sampling describes the collection and extraction of undisturbed soil. Polymer Gel reduces friction during sampling process and soil extrusion and it work to maintain sample in high quality. Undisturbed samples are generally taken by cutting blocks of soil or rock, or by pushing or driving tubes into the ground. Use: Split spoons provide samples from cohesive soils. 7.2.3 Sampling Subsurface Soils with Power drilling. Designed for undisturbed soil sampling to 10 m.

The relationship of piston thrust pressure and displacement of piston during sample extrusion is shown in Figure-1. Unless it is certain that the soil will not accumulate moisture after construction, CBR tests are performed on soaked samples. 7.2.2 Sampling Soils with Augers and Thin-Wall Tube Samplers. Because the Van Walt Percussion Window Sampling System is unique. The effect of reducing the friction was confirmed during extrusion of the soil sample as well. The polymer solution is coated on a surface of a soil sample, and reduces friction between the sample tube and the sample during the sampling process. Even though such samples are designated as undisturbed, in reality they are disturbed to varying degrees. One of the major features of this sampling method is that polymer solution of high concentration is used as its drilling fluid for lubricant and not circulated unlike conventional drilling fluid. Undisturbed soil sample is used to determine the in place strength, compressibility (settlement), natural moisture content, unit weight, permeability, discontinuities, fractures and fissures of subsurface formations. sampler is commonly used to obtain relatively undisturbed samples of cohesive. Can buy multiple sample tubes and plastic end caps for the tubes. The samplers are available in 2 sizes, being for a 48mm x 300mm sample or 40mm x 300mm sample. It is made from stainless steel only and has either a stainless steel or hard clear plastic inner sample tube. Gel-Push (GP) sampler was developed by Kiso-Jiban Consultants in cooperation with Professor Tani, of Graduated School of Engineering, Yokohama National University, to obtain high quality undisturbed soil samples. Split Barrel Sampler: (a) Open sampler with soil sample and cutting shoe. The Core-Tube sampler is for taking undisturbed samples in normal soils.

Undisturbed soil sampler