Shelby Tubes And Thin Walled Sampler

5 1 thin walled tube samples are used for obtaining intact specimens of fine grained soils for laboratory tests to determine engineering properties of soils strength compressibility permeability and density.

Shelby tubes and thin walled sampler. Thin wall samplers shelby tubes thin walled samplers are designed to take undisturbed samples in cohesive type soils and clays. They are suitable for fine soils up to a firm consistency and free from large particles. The bottom of the tube is sharpened and beveled which acts as a cutting edge. The tube is pushed driven into the soil.

Typical sizes of thin walled tubes are shown on table 1 the most commonly used tube is the 3 in. The thin steel tube may be removed from the sampler to be used as a container to transport the sample minimising disturbance preserving moisture and reducing delays in the sampling procedure. The sampler consists of a thin walled steel tube whose lower end is chamfered to form a cutting edge. The sampler consists of a thin walled steel tube whose lower end is shaped to form a cutting edge.

The thin walled seamless steel tubes are called shelby tubes. The clear sketch of shelby tube is shown in fig 2 6 a. The upper portion of the sampler has threads on the inside surface to enable the sampler to be attached to the bottom of the drill rod. The shelby sampler is a thin walled soil sampling system.

Thin walled open tube samplers are designed for taking samples in soft and firm cohesive soils. They are generally used to take undisturbed samples for routine site investigation works. Shelby tube sampler thin wall open tube samplers shelby tube samplers are used for soils that are particularly sensitive to sampling disturbance. Two factors which are essential for evaluating engineering properties.

Thin walled shelby tube sample. Shelby tube sampling methods are used to collect undisturbed samples of soft fine grained cohesive soils in an effort to recover intact samples which are representative of the in situ soil density and water content. Shelby tube samplers are thin walled hollow steel tubes which are driven into the ground to extract a relatively undisturbed soil sample for use in laboratory tests used to determine density permeability compressibility and strength. However some disturbance is caused due to friction of the sample on the inside of the sample tube.

This sampler should be forced into the soil by pressing under steady pressure in order to take sample. These samplers have a much lower area ratio approximately 10 than u100 samplers and therefore give less disturbed samples. 2 shows the use of the sampler in a drill hole. They are thin wall tube samplers made of seamless steel and are also known as thin wall shelby tube samplers.

Shelby tube sampler is utilized in the standard practice for thin walled tube sampling of soils for geotechnical purposes used for sampling undisturbed samples of cohesive silts and soft clays.