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9MATHEMATICAL ANALYSIS APPLICATION OF THE GAS-DYNAMIC PRINCIPLE FOR DEEP COOLING OF THE UNDERWAY SOIL LAYER
Rasuljon Tojiyev Xusniddin Nargiza Rajabova Dovudbek Odilov
Erkaboyev
Fergana Polytechnic Institute
ABSTRACT
In the article, information on a new method of deep loosening of the subsoil layer, based on the use of detonation wave energy was given. For these purposes, the parameters of the device acting on the soil in a non-contact way and operating on the basis of detonation energy were developed and substantiated, designed for deep loosening of the subsoil.
Keywords: subsoil, loosening, subsoiler, detonation wave, gas-dynamic impulse, soil, detonation, pressure impulse, shock wave, stresses, cotton, borehole, impulse force, friction force, penetration rate, soil resistance, soil strength, principal stresses, soil resistance.
One of the directions of the ongoing reforms in Uzbekistan is to improve the efficiency of agricultural production. There are various ways and methods of raising agricultural production to the world level. This can be achieved by intensifying agricultural production, primarily by applying scientifically grounded farming systems, efficient use of land, and increasing their fertility. Improving the efficiency of irrigated land use is impossible without improving the fertility of the subsoil by deep tillage.
"5
When the density of the subsoil horizons is higher than 1.4 g /cm , plant roots develop mainly in the arable layer, which is subject to frequent drying out during the hot summer period.
With deep cultivation, the root system of cotton develops in favorable conditions, deforms little, does not squeeze, bends less (Fig. 1) and is covered with lateral processes along the entire length. Thus, according to M.V. Mukhamedjanov, S. Suleimanov [1], with plowing to a depth of 30 cm and loosening the soil to 55 cm, the number of taproots directed vertically downward with almost no deformation was 4 times greater than when plowing to a depth of 30 cm without loosening. The experiments of A. Djuraev [1] confirmed that loosening the subsurface horizon to 50 cm made it possible for the cotton roots to penetrate to a depth of 190 cm, which led to an increase in the yield of raw cotton.
SCIENTIFIC PROGRESS
VOLUME 2 I ISSUE 7 I 2021 ISSN: 2181-1601
Fig. 1. Development of the cotton root system according to the depth of
cultivation.
The subsoilers used today do not meet the modern requirements of agricultural technology, they are energy-intensive and have low productivity. Therefore, we have proposed a new method of deep loosening of the subsoil layer, based on the use of detonation wave energy and which is a completely new method.
During operation, the gas detonation tool exerts a force effect P (t) on the borehole bottom, which is of an impulsive nature. A single-acting impulsive load is understood as a short-term load of a constant direction, which has no more than one maximum during its continuous action, represented by analytical expressions:
P(t) = Po f (t) at 0 < t <t
>
I (1)
P(t) = 0 att>
Here, t = 0 is the beginning of the load; P = 0 its maximum; f (t) -function characterizing the shape of the pulse, and the maximum.
Single-acting load (1) is characterized by three parameters:
1. Duration;
2. The shape of the impulse f (t);
3. The greatest value of P0 or impulse of force S.
T
S = Po J f (t) dt
(2)
The duration of the action of impulse gas detonation loads □ is approximately 0.002 sec. those. shock type.
The impulse at a direct impact of a wave on the bottom of the soil can be determined by the approximate formula
S=muo(1+k0) (3)
Where, m - is the mass of combustion products; uo - speed at the beginning of the strike;
o
ko - coefficient of recovery to impact, depending on the properties colliding bodies.
The pulse has three main parameters.
P-impulsive load;
S- is the strength of the impulse;
i-pulse duration.
From these parameters, P and i can be determined experimentally, i.e. by measuring. The strength of the impulse can be determined using formulas (3). To do this, it is necessary to determine the speed of the combustion products uo at the beginning of the impact.
The soil massif falling under the shock wave will undergo deformation at all its points. Note that in this array there are sets of points with the same stress values, and their geometrical place, undoubtedly, should be some kind of regular curve (Fig. 2).
Fig. 2. Calculation scheme.
In addition, the cooled portion of the detonation product serves as an intermediate layer between the fresh mixture and the detonation product at the discharge stroke. This prevents spontaneous ignition of the fresh mixture from the detonation product of the previous cycle.
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