Soil density: also known as soil specific gravity. Dry weight per unit volume of soil (without pores). One of the soil physical parameters. The unit is Mg / m3. Its size is related to soil chemistry and mineral composition. Generally, the density of soil is mostly in the range of 2.6 ～ 2.8Mg / m3, and the density of soil with high organic matter content is low. The data of soil bulk density can be used to calculate the total soil porosity. The average density is usually 2.65Mg / m3. The density of the soil is generally 1.5 to 2.0 tons / cubic meter (it can not be 2.6 to 2.8, because ordinary concrete is only about 2.5 at most). The exact value of the density of the soil in the garden can not be clearly explained, only through experiments. The density of the general soil can be obtained by the ring knife test.
Specific operation steps of ring knife method:
(1) This test method is applicable to fine-grained soil.
(2) The main instruments and equipment used in this test shall meet the following requirements:
1) Ring knife: inner diameter 61.8mm and 79.8mm, height 20mm.
2) Balance: Weighing 500g, the minimum division value is 0.1g; Weighing 200g, the minimum division value is 0.01g.
3) To measure the density with the ring knife method, a thin layer of petroleum jelly should be coated on the inner wall of the ring knife, the cutting edge should be placed down on the soil sample, the ring knife should be pressed down vertically, and the soil sample should be cut along the outside of the ring knife with the cutting knife Cut the soil sample higher than the ring knife. According to the hardness of the sample, use a wire saw or a soil cutter to level the soil samples at both ends of the ring cutter, wipe the outer wall of the ring cutter, and call the total mass of the ring cutter and the soil.
4) The wet density of the sample should be calculated as follows:
Ï0 = M0 / V
Where Ï0——wet density of sample (g / cm3), accurate to 0.01g / cm3.
5) The dry density of the sample should be calculated as follows (see attachment).
6) This test should be measured twice, the difference between the two determinations should not be greater than 0.03g / cm3, and the average of the two measurements should be taken.
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