SU1726647A1 - Method for soil consolidation by explosions and device for its accomplishment - Google Patents

Abstract

The invention relates to the construction, in particular to the compaction of soils by explosions, and is aimed at increasing the degree, depth and uniformity of compaction. This is achieved by placing an explosive charge on the ground surface, erecting it with a load with a charging chamber, creating a counter-pressure in a closed volume above the charge and blasting the charge. The device contains a block 1 of vertically placed rigid elements 2. Block 1 has a charging chamber 4 and a flat charge 12 placed therein and is mounted on the chassis. A cutting tooth 10 is located along the perimeter of the block 1. The chamber 4 is provided with a horizontal, vertically movable rigid plate 5 and an elastic sheath 6 located above it with a drainage hole 11. The rigid plate 5 is placed above the ground surface at a distance determined from description text. 2 sp.f-ly, 1 ill. L L IC

Description

The invention relates to the construction, in particular to the compaction of soils by explosions.

The purpose of the invention is to increase the degree of depth and uniformity of compaction.

The drawing shows the device, the overall appearance.

Horizontal charges of an explosive are placed on the surface of the soil, and a load with a charging chamber is erected above it. Above charge, a counter pressure in a closed volume is created and a charge is blown up.

The device for soil compaction with explosions contains a block 1 on a running gear (not shown) with vertically mounted rigid elements 2 on the rod 3. In the charging chamber 4 of the block 1 a rigid movable plate 5 and an elastic shell attached to it and the upper part of the charging chamber 4 are placed 6, filled with gaseous medium 7. In grooves 8 of block 1, horizontally movable latches 9 of the initial position of the plate 5 are installed. A cutting tooth 10 is located along the perimeter of block 1. In block 1, a drain hole 11 is made to regulate the initial pressure tim gas 7 in the shell 6. In the charging chamber 4 of the softening of

Jh

Flat horizontal charge 12 of explosive with detonating cord 13 and electric detonator 14.

The rigid plate 5 is located above the ground surface at a distance determined from the dependence

Ho - (0.5-0.75). -f. br n

where d is the diameter of the charge, m;

- length of charge, m;

n is the number of charges in the charge chamber, pcs;

a, b are the geometrical dimensions of the charge chamber in plan, m

The device works as follows.

Above the flat explosive charge 12, a block 1 is assembled with rigid elements 2 on the rod 3 until the cutting tooth 10 is fully submerged. Rigid elements 2 increase the weight of unit 1 for utilizing the charge of a high explosive.

In the initial position, the movable plate 5 is fixed by the latches 9 above the surface of the soil being compacted. Through the drainage hole 11 in the elastic sheath 6 pump gas, for example, air, creating a preliminary pressure in it. The electric detonator 14 and the detonating cord 13 produce an explosion of flat charges 12. In the charging chamber 4, the pressure increases sharply to a value exceeding the pressure of gas 7 in the elastic shell 6. As a result of the explosion, the process of compaction of the soil begins loads. At the time when the pressure in chamber 4 exceeds the pressure of gas 7 in elastic sheath 6 and the weight of plate 5, the latter moves upwards. The clips 9 are released and, under the action of the pressure of the explosion, are sunk into the grooves 8, without further restricting the movement of the plate 5. The pressure in the charging chamber 4 drops. During the subsequent reverse movement of the plate 5, the pressure increases. Plate oscillations 5

0

0

5 0 5

continue until the explosion energy is completely dissipated. During this time, dynamic loads act on the surface of the soil, under the action of which the bulk soil massif is intensively and evenly compacted.

The use of the proposed method of soil compaction by explosions and a device for its implementation increases the compaction degree of the soil by about 25-30%, the compaction depth 1.3-1.5 times, while ensuring uniform compaction of the array.

Claims (2)

1. A method of compacting soils with explosions, including placing an explosive charge on a soil surface, erecting a prigruz with a charging chamber above it and blasting a charge, characterized in that, in order to increase the degree, depth and uniformity of compaction, before blasting the charge create above it, the counter-pressure in a closed volume. 2. A device for compacting soils with explosions, including a block of water-resistant rigid elements with a charge chamber and a charge placed in it, a running gear and a cutting tooth located along the contour of the block, characterized in that, in order to increase the degree, depth and uniformity sealing, charging chamber is equipped with a horizontal vertically movable rigid plate and located above the last elastic sheath with a drainage hole, a flat charge is used as a charge, and a rigid plate is placed above the surface soil at a distance determined from the dependence X0 (0.5 - 0.75) l d2 I- n a – b where d is the charge diameter, m; f-length of charge, m; n is the number of charges in the charge chamber, pcs; a, b - geometric dimensions of the charge chamber in plan, m.