Soil Sampling for Pore Space and Percolation: Field and Laboratory Procedures (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Soil Sampling for Pore Space and Percolation: Field and Laboratory Procedures

The sampler used at the Piedmont Research Center is shown in figures 1 and 2. This sampler holds a copper cylinder in which the soil is collected. It is driven by impact using the 12 to 16 pound hammer illustrated in the figures. Because the hammer is mounted on a rod which slides inside the same pler handle, the sampler can be driven with a minimum of wobble. Generally, when sampling heavy soils one man guides the sampler while another man usesthe hammer. A heavy hammer avoids some of the jarring and breakdown of structure caused by many blows from a lightweight hammer.

The copper cylinders in which soil is contained are cut from 3-inch copper pipe. The inside diameter is cm. And the cylinders are cut to be cm. Long to hold 250 ml. Cylinders are fitted with lids made from sheet copper. The top lid and cylinder are numbered and stay together throughout the field and laboratory procedure. Lower lids are interchange able and used only until the sample begins laboratory processing. A small hole is drilled into the top lid to prevent air trapping during saturation and to allow entry of air when the sample is on the tension table.

The copper cylinder is slipped into the sampler after removing the sampler cutting head, which is held only by a loose friction fit. The cut ting head is not tempered or specially hardened and is easily kept in shape with a carborundum stone and file. The most satisfactory cutting surface is square edged and about inch wide. A knife-like cutting edge does not cut roots as well and is quickly damaged by rock.

Figure l.-equipment used for collecting core samples in a pit. In the upper left hand corner is the empty copper cylinder with two lids. Next to it is a cylinder ready for saturation, inverted to show the cheesecloth on the bottom. In the middle is the soil sampler with Copper cylinder and cutting head. At the bottom is the driving hammer. The long end of the hammer is inserted in the hollow handle of the sampler to drive it in the soil.

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