Method of determining coefficient of soil filtration

FIELD: agriculture.

SUBSTANCE: soil sample is passed through a stream of water. On the surface of the soil sample a load is placed. Beginning of dipping of the load is fixed. The parameters of the sample and the water flow are measured. The coefficient of soil filtration is calculated from the measured parameters. The value of the concentration of fulvic acid in the water stream, passed through the soil sample, is recorded. In reducing the concentration value by 10% of the initial value the fulvic acid solution is added into the stream of water directed into the soil sample, restoring the value of the fulvic acid concentration in the stream of water passed through the soil sample, to the initial value.

EFFECT: use of the claimed method extends functional capabilities of determining the filtration coefficient of soil, enables to determine quickly and accurately the filtration coefficient of soil exposed to fulvic acids, in the zone of prevalence of podzolic soils.

1 tbl, 1 ex

 

The invention relates to the field of research of the parameters of soils, and more specifically to methods for determining permeability of quicksand soil in the zone of distribution podzolic soils.

There is a method of determining the permeability of the soil, which is passed through a sample of ground water flow, measure the cross-sectional area, the length of the sample and the volume of water flow for a certain time interval, calculated using the measured indicators of the permeability of the soil (Vadyunin A.F., Korchagina Z.A. research Methods physical properties of soils. - 3rd ed. - M.: Agropromizdat. 1986. - S-236).

The known method does not provide the possibility of determining the permeability of quicksand ground in pseudogigas condition, because it does fix the time of the loss of carrying capacity.

The closest in technical essence and purpose of the proposed technical solution is the method for determining the permeability of soil in which the soil sample is passed a stream of water, on the surface of the soil sample will churn weight, record the beginning of the dive weight, measure parameters of the sample and the flow of water, calculated on the measured indicators of the permeability of the soil (patent RF №2462709, published on 27.09.2012 in bull. No. 27).

The disadvantage of this method is the inability defined the I coefficient filter quicksand ground, exposed to a solution of fulvic acids, in areas with podzolic soils.

The aim of the invention is the extension of functionality.

The invention consists in that the method for determining the permeability of quicksand soil exposed to a solution of fulvic acids, in areas with podzolic soils via soil sample flow stream of water on the surface of the soil sample is placed on the weight record the beginning of the dive weight, measure parameters of the sample and the flow of water, calculated on the measured indicators of the permeability of the soil, characterized in that record the concentration value of fulvic acids in the stream of water passing through the soil sample, and the decrease in the concentration of 10% from the initial value injected into the stream of water directed into the soil sample, the solution fulvic acids, restoring the value of the concentration of fulvic acids in the stream of water passing through the soil sample to the initial values.

The method is implemented as follows. On the upper surface of the sample placed on the weight. Passed through the sample, the flow of water. Record the concentration of fulvic acids in the stream of water passing through the soil sample. Lowering the concentration of 10% from the initial value injected into the stream of water directed on ASEC soil, a solution of fulvic acids, restoring the value of the concentration of fulvic acids in the stream of water passing through the soil sample to the initial value. The change in the value of the concentration of fulvic acids in the stream of water passing through the soil sample, less than 10% of the initial no significant effect on the parameters of the filtering process. A solution of fulvic acids administered in individual portions. Transfer the soil sample in pseudozyma condition, record the beginning of the dive sinker, which shows a sharp drop in load carrying capacity and transition ground in pseudozyma state. The weight of the sinker take more than 5, When the weight of a weight of less than 5 g surface tension forces prevent his dive.

Next, measure the cross-sectional area, the length of the sample, the amount of water for a period of time, pressure and calculated by the well-known formula filtration coefficient quicksand ground

k=W·l/(F·T·h)

where W is the volume of water, F is the cross-sectional area of the sample, T is the time interval, h is the pressure, l is the length of the soil sample.

An example implementation of the method. The soil sample is represented by fine-grained pensioenen sand. On the upper surface of the sample place the sinker weight 6, Create the flow of water. Record the concentration value of fulvic acids in the stream of water passing through the soil sample - 2%. Note the decrease in the oxygen the walkie-talkie up to 1.5%. The decrease in concentration is 25% of the initial value.

The decrease in concentration due to exchange processes in the system soil-water flow. Separate portions enter into the flow of water to be discharged into the soil sample, 15% solution of fulvic acids, restoring the value of the concentration of fulvic acids in the stream of water passing through the soil sample, up to a maximum of 2%. Transfer the soil sample in pseudozyma state. Record the beginning of the dive weight. The transition of the soil sample in pseudozyma condition and loss of bearing capacity is fixed at the beginning of the descent of the sinker weight 6, Measure the cross-sectional area F=13 cm2. For the time interval T=10 min measure the length of the soil sample is l=16 cm, head h=34 cm, the amount of water W=116 cm3. Calculate the coefficient of filtering by the well-known formula k=W·l/(F·T·h)=116·16/(13·10·34)=0.42 cm/min=6.04 m/day. The table presents data variance values of permeability of the soil at different values of changes in the concentration of fulvic acids in the flow of water leaving the soil sample.

The deviation of the concentration of fulvic acids from primary, %571012 1719
Deviation coefficient value of the filter from the start, %234899

These tables show that the deviation of the concentration of fulvic acids from starting more than 10% causes a sharp increase in the variance of the coefficient value of the filter 4 to 8%.

The proposed method of measuring the permeability extends the functionality of the analogue by introducing into the stream of water flowing through the soil sample, a solution of fulvic acids.

The method for determining the permeability of quicksand soil exposed to a solution of fulvic acids, in areas with podzolic soils via soil sample flow stream of water on the surface of the soil sample is placed on the weight record the beginning of the dive weight, measure parameters of the sample and the flow of water, calculated on the measured indicators of the permeability of the soil, characterized in that the fixed value of the concentration of fulvic acids in the stream of water passing through the soil sample, and the decrease in the concentration of 10% from the initial value injected into the water flow, voltage is supplied to the soil sample, a solution of fulvic acids, restoring the value of the concentration of fulvic acids in the stream of water passing through the soil sample to the initial value.



 

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