Method of determining soil permeability

FIELD: chemistry.

SUBSTANCE: when realising the method, a weight is placed on the top surface of the sample; the soil sample is converted to a pseudoliquid state; the beginning of sinking of the weight is recorded; further, the cross-section and length of the sample, pressure and volume of the stream of water over a defined period of time are measured; soil permeability is calculated from the measured values.

EFFECT: possibility of determining permeability of running soil in pseudo-liquid state by placing a weight on the top surface of the soil sample and recording the beginning of the sinking of the weight.

1 ex

 

The present invention relates to the field of research of the parameters of soils, and more specifically to methods for determining permeability of quicksand ground.

There is a method of determining the permeability of soil layer in the field, including the drilling of vertical wells, the pumping of ground water, the measurement of the rate of recovery of water level in the well and well parameters, the calculation of the measured values of permeability is described in the book: Madunina A.F., Korchagina Z.A. research Methods physical properties of soils. - 3rd ed. - M.: Agropromizdat, 1986. - S-236.

The known method does not allow to determine the permeability of the top layer of soil with a low water level of groundwater.

The closest in technical essence and purpose of the proposed technical solution is the method for 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 parameters permeability coefficient of the soil described in the book: Madunina 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 adjusted the rate of filtration quicksand ground in pseudogigas condition, since it is not possible to fix the time of the loss of carrying capacity.

The aim of the invention is the determination of the permeability of quicksand ground in pseudogigas condition.

This goal is achieved by the fact that on the upper surface of the sample placed on the weight transfer the soil sample in pseudozyma condition, record the beginning of the dive sinker, and then measure the cross section, length of the sample, the pressure and volume of flow of water over a certain time interval, calculated using the measured values of permeability coefficient of the soil.

The method is implemented as follows. On the upper surface of the sample placed on the weight. In the soil sample creates a flow of water. 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 FPIC of the BA. The soil sample is represented by fine-grained sand. On the upper surface of the sample place the sinker weight 7, Create the flow of water. Translate the 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 7, Measure the cross-sectional area F=14 cm2. For the time interval T=10 min measure the length of the soil sample is l=16 cm, head h=37 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/(14·10·37)=0.358 cm/min = 5.15 m/day.

The proposed method of measuring permeability in comparison with analogue provides the possibility of determining the permeability of quicksand ground in pseudogigas condition by placing on the upper surface of the soil sample weight and fixing the beginning of the dive.

The method for 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, characterized in that on the upper surface of the sample placed on the weight transfer the soil sample in pseudozyma condition, fix Acala dive weight, and then measure the cross-sectional area, the length of the sample, the pressure and volume of the upward flow of water.



 

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