SU1346729A1 - Method of forming contour trench - Google Patents

Abstract

The invention relates to the construction, in particular to the compaction of loess subsided soils by preliminary soaking and deep explosions. The invention is directed to increasing the efficiency of formation of a contour trench before the blast seal. This is achieved by the fact. that, along the contour of the compacted area of the drill, explosive wells place elongated explosive charges in them, parallel to the line of explosive wells on the outer side of the contour of the drill holes, fill them with drainage material and soak them through the soil zone to a state of plastic consistency, after which explosions are carried out in contour wells with the formation of a contour camouflet trench. Then an array of compacted soil is soaked and deep explosions are carried out. Pre-soaking the soil from the outside of the trench allows the formation of a compacted soil zone with low water permeability. This reduces the water consumption and the duration of the soaking of the array, prevents the soil from deforming outside the compacted area, eliminates negative friction around the contour of the compacted array. 7 il. (L 00 4ih & 5 IsD CO

Description

13

The invention relates to the construction, in particular to the compaction of loess subsided soils by preliminary soaking and deep explosions.

The purpose of the invention is to increase the efficiency of formation of the contour trenches, mainly non-hydraulically exploded. Nym compaction of an array of loess pro cage soil,

FIG. Figure 1 shows a compacted area with contour blast holes, a plan; in FIG. 2 a section A-A in FIG. one; in fig. 3 - plot with contour drainage wells, plan;

in fig. 4 is a cross section in FIG. 3; in fig. 5 - profile of the site at the time of the explosions in the contour blasting squash; in fig. 6 - the same, during the wetting period of the array; Fig. 7 is the same after the hydraulic blast compacting of the array.

The method is carried out as follows.

The area of the compacted area 1 of the drill hole drainage-blast wells 2j places explosive charges 3 and drainage 1P | 1st material 4 in them. Explosive wells 5 are placed in the contour of the drill section 1 and elongated explosive charges 6 The contour of section 1 outside of it is drilled with drainage wells 7 and filled with drainage material. Water is supplied to wells 7, wetting the soil around them to a plastic consistency, while wetting zones 8 should close up and reach explosive wells 5. After that, Yu t explosions of charges 6 in wells 5, as a result of which a commutant trench 9 is formed along the contour of section 1 to the full depth of the packed subsiding thickness. Water is then pumped into wells 2, the array is soaked to a fluid consistency, and charges 3 are exploded in wells 2, which results in subsidence and compaction of the soil mass within Section I. The water from the compacted soil 10 is compressed. 9, from where it is removed by a pump.

The formation of a contoured camouflage trench 9 with preliminary soil moistening gC of its outer side to the state of plastic consistency allows to obtain an area 11 of compacted soil, which has a low water supply.

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incompatibility This sDKa has the role of an impervious curtain that prevents soil from soaking outside the contour of section 1 This reduces the water consumption and the soaking time of the compacted massif, prevents deformation of the soil beyond the compacted area, eliminates negative friction along the contour of the compacted array,

EXAMPLE Soil is compacted over a length of 30,

g 20 wide and with a depth of subsidence of 20 m. Inside the plot, on a square grid with a step of 5 m, there are drainage wells of 13 MS depth equal to 2/3 of the depth of the subsidence

thickness An explosive charge of 8 kg is placed in these wells and coarse-grained drainage material is poured from above. Along the contour of the compacted area of the drill, vertical wells with a diameter of 75 mm over the entire depth of the subsidence are located and elongated charges of explosive are placed throughout their depth. For the formation of a contour trench 0.3-0.4 m wide, the pitch of the contoured squave} kin

 no more than this width is understood, the mass of elongated charges is determined experimentally from the condition of formation of closing camouflet cavities.

Parallel to the contour of the blasting wells on the outer side of the reservoir, drainage wells with a diameter of 90 mm in increments of 1 m are filled with their coarse drainage material. The distance between the lines of drenal and explosive

0 wells accept 0.4 MD of the outcome, from the radius of the wetting zone 0.5 m. Water is supplied to the drainage wells in the calculated amount with soil moistening to a moisture level of 0–4–56, which characterizes the soil consistency of the plastic consistency. charges in blasting holes, resulting in contour

0 camouflage trench pshrina 0.3-0.4 m and a length of 100 m. After that, water is supplied to drains, explosive wells in the area with soil moistening to the degree of moisture O, 80-0.85, characterizing the fluid consistency of the soil. carry out deep explosions in the drenazkno-explosive wells with intervals of 1-3 s, as a result of which subsidence occurs

soil compaction at the site. The water entering the circuit trench is pumped out by a pump.

Claims (1)

The invention The method of forming a contour trench, mainly before the blast compaction of an array of loess subsidence of the soil, including the drill-IQ and the flow of water into them with the formation explosive wells along the contour of a compacted array of soil, placing elongated charges in the wells explosives and the initiation of a charge explosion, characterized in that, in order to increase efficiency, after placing explosive charges in wells, drilling drainage wells are drilled parallel to the contour beyond it, filling them with drainage material closable and reaching explosive wells zones wetted to the plastic consistency of the soil. Ai Phys .2 J j 7 7 7 FIG. five / R, -A., - nineteen ..,, ../,A,,.t., //. nineteen //г.5 J j Compiled by M. Hasin Editor A. Shandor Tehred A. Kravchuk Order 5102/29 Circulation 606 Subscription VNISh State Committee of the USSR for inventions and discoveries 113035, Moscow, ZHZe Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 /2.7 Proofreader M.Sharoshi