Method of dewatering sandy soils

 

(57) Abstract:

The invention relates to hydraulic construction and can be used for dewatering sandy soils during construction of engineering structures. How is that in the local area at the sandy soil, where it is necessary to carry out dewatering, drilling of wells on the same line in increments of 10-15 m, reinforced the well perforated casing pipe and put a layer of gravel on the bottom of the well. Lowered into the well pipe from the pump and produce the pumping of groundwater. To improve the efficiency of the process is placed on the bottom of the well vibro-exciter, excite elastic vibrations in the range 60-1500 Hz, lead local area ground to an excited state and are pumping ground water vibromaster. 4 C.p. f-crystals, 1 Il.

The invention relates to hydraulic construction and can be used for dewatering of soils during construction using elastic migration geoeffective.

There is a method of dewatering wells, including drilling, filing in a pulsed mode of air-wells for intensification of water [1].

However, this method is tedious, the bones of way.

There is a method of dewatering sandy soils, including drilling, formation in the region of their faces pits, equipment wells perforated pipes, backfilling of pits, gravel and pumping groundwater using pump [2].

However, this method is tedious, ethnological not use to increase the permeability of the soil mass elastic vibrations.

The purpose of the invention is improving the efficiency of the method by reducing energy intensity.

This objective is achieved in that way at wells place non-explosive pneumatic vibration sources, excite elastic vibrations in the range 60-1500 Hz with the orientation direction of their impact along lines connecting the wells, leading to an excited state of the local area's sandy soil and affect the vibration actions during the time of pumping water. Well in sandy soil Buryats on one straight line in increments of 10-15 m from each other.

Vibro-exciter is placed in the hole on the output level of the groundwater in the sandy soil. The layer of gravel is 50-60 cm, and the size fractions of crushed stone is within 10-120 mm Suction pipe from the vacuum pump is lowered to tematicheskie pump when exceeding the level of the water in the pipe 5-10 cm in relation to the water level in the well.

The drawing shows a circuit implementation of the method, showing the ground array 1, a layer of sand 2, well 3 with a perforated pipe, a layer of crushed stone 4, the vacuum pump 5 with a pipe of the compressor 6 high pressure EU-5 and EU-6, block 7 of the agreement, the microprocessor 8 to control the operation of the vibration sources.

The method is as follows.

In the local section of the array 1, which is filled with the sand layer 2 or sandy soil, drilling of wells 3, reinforced their perforated pipes and place them in the vibration sources 9, operating in the frequency range 60-1500 Hz, with orientation directions of their effects along lines connecting the bore 3. Wells are drilled in increments of 10-15 m from each other on the same straight line and the vibration sources 9 place them on the output level of the groundwater. At the bottom of the well is put a layer of crushed stone 4 with a thickness of 50-60 cm with factions 10-120 mm In this layer of gravel 4 down pipe from the vacuum pump 5 with such a condition that it touches the upper layer of crushed stone and no place clogging its particles-sand, silt and other solid debris. Before turning on the vacuum pump 5 excite vibrations of the vibration sources 9, which serves a pulse of compressed air from the compressor 6 to be converted to microprocessor 8, in that program, which control the operation of the vibration sources 9 in time and carry out the pumping of groundwater in the automatic mode by turning on the pump when exceeding the level of the water in the pipe 5 5-10 cm in relation to the water level in the well 3. Vibration produced by the vibration sources 9, placed in two wells, alternately, first in one hole, then another, and time zone on each side to limit the migration of fluids-liquids and gas-air inclusions contained in the pores and fractures of sand, which is determined from the ratio of Migratsii-L/Emigratsii, where L is the path traversed by the elastic wave from one well to another, and C is the speed of migration of fluids under the influence of the elastic wave in m/s

To create a filter on the bottom of the hole put a layer of gravel fractions from 10-120 mm, which provides optimal conditions for pumping groundwater from the sandy soil of the 3 wells drilled at a distance from one another 10-15 m, which place the vibration sources 9, the amplitude of which slowly rise from lowest level up to the level at which it starts liquefaction of Sands, which is 0.2-0.4 from urovnem local section of the ground excited state in the range 60-1500 Hz, moreover, the frequency range can be chosen according to the optimal conditions of wave similarity is the ratio of the wavelength, then move on to the frequency of oscillations in the sandy soil, vibration exercise over time, which causes a positive effect pumping of groundwater from the soil mass.

The essence of the method is that arouse powerful elastic vibrations in a selected range of frequencies through a group of vibration sources, create conditions for optimal and intensive migration of fluids in the direction of propagation of elastic waves in tens and hundreds times higher than the level of migration without the participation of the elastic wave, and produce the pumping of groundwater from the sandy soil from wells placed in the path of wave propagation in a straight line. Migration of fluids under the influence of elastic waves is called elastic migration geoafrica and has a place in any frequency range from Hz to kHz and MHz and the selected frequency range only defines the base of the experiment: in the range of Hz - kHz tens and hundreds of meters, mm in the range of MHz is the first meters.

Advantages of the method are as follows: no need to dig the pit for pumping and collection of groundwater; control rivada in the excited state local section of the soil mass; increase the efficiency and performance of the method by reducing the intensity of way.

The use of the proposed method can significantly reduce the energy consumption of the process and increase productivity by about an order in comparison with the known methods of pumping groundwater through the use of elastic migration geoeffective.

1. METHOD of DEWATERING SANDY SOILS, including drilling, formation in the region of their faces pits, equipment wells perforated drainage pipes, backfilling of pits, gravel and pumping of ground water by a pump, characterized in that at well placed non-explosive pneumatic vibration sources, excite elastic vibrations in the range of 60 to 1500 Hz with orientation directions of their effects along lines connecting the wells, leading to an excited state of the local area's sandy soil and affect the vibration actions during the time of pumping water.

2. The method according to p. 1, characterized in that the wells in sandy soil are drilling in a straight line with a step of 10 - 15 m from one another.

3. The method according to p. 1, wherein the vibro-exciter is placed in the well is gravel form a layer thickness of 50 - 60 cm from fractions of crushed stone 10 - 120 mm

5. The method according to p. 1, characterized in that the pumping of groundwater is carried out using the pump, the suction nozzle is lowered to the bottom of the well with a swing of the surface layer of gravel, and the pumping of groundwater automatically pump the excess water level in the pipe 5 to 10 cm in relation to the water level in the well.

 

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