Method for determining volume weight of irregular, hard and dry soil block

Abstract

The invention relates to a method for determining the volume weight of an irregular, hard and dry soil block. The specific process comprises the following steps: (1) collecting two soil block samples; (2) weighing the mass of one dry soil block; (3) putting the dry soil block into liquid paraffin to carry out covering; (4) cooling the soil block covered with a paraffin film and weighing the mass of a paraffin sealed soil block; (5) weighing the sum of masses of a beaker and water before putting the paraffin sealed soil block into the beaker; (6) weighing the mass of the beaker after the paraffin sealed soil block is put into the beaker; (7) weighing the other soil blocks, crushing and weighing the mass; drying and weighing; (8) transferring the liquid paraffin with a certain volume and weighing; calculating the density of the liquid paraffin; (9) checking a table to obtain the density of the water at a testing temperature; and (10) calculating the volume weight of the sample. The technology provided by the invention is used for determining the irregular and easily-crushed soil blocks and does not damage the structure of the soil body; the liquid paraffin is used for covering so that the soil block and the water are sufficiently separated; the mass is accurately weighed by a balance and the volume of the soil block can be accurately measured; the determination process is convenient and simple and is easy to grasp; needed tools are few and the determination cost is low.

Description

technical field [0001] The invention relates to a method for measuring the bulk density of irregular hard dry soil blocks, belonging to the technical field of soil physical measurement. Background technique [0002] Soil bulk density refers to the dry weight including the volume of soil voids per unit volume in the natural state. It is an important indicator to measure soil structure, compactness, air permeability, water permeability and tillability. It has important roles in agricultural production and civil engineering construction. important application significance. When evaluating soil fertility, soil quality, engineering quality, etc., the measurement of soil bulk density is often used. [0003] At present, soil bulk density determination has ring knife method (Liu Duosen, Li Weibo; Simple measurement method of soil bulk density and porosity, Soil Bulletin, 1983, 2 (2): 39-40), digging method (Wang Qingli, Dai Limin, Xu Guangshan; Simple forest soil bulk density dete...

AI Technical Summary

Problems solved by technology

[0004] The above method is mainly used on soil with loose soil structure, low hardness, and deep soil layer. If it is particularly compact, hard, extremely dry or burned soil and rammed earth in engineering, the above method is difficult to sample. Collected clods of complete shape

Moreover, the ring knife method and the soil drilling method are often easy to damage the original structure of the soil, and it is easy to cause the rupture or breakage of the soil block, causing the original soil sample to become compact, thereby increasing the actual bulk density of the sample.

In addition, for particularly compact soil, it is easy to damage or jam the ring cutter, soil auger and soil borrowing pipe

The digging method is time-consuming and laborious, and it is generally difficult to dig out a standard cube or cuboid, so errors are prone to occur when calculating the volume

The drainage method has a large error in the determination of the volume of small soil blocks

And the measurement method announced by patent CN102721628A needs a miniature vacuum pump, and it is difficult to fully evacuate the space around the soil block

Images