Method of eliminating inrush of water through vertical groove

FIELD: mining.

SUBSTANCE: invention refers to mining and is designed for elimination of hazardous situation at instantaneous inrush of water. Massif of rock is bored around with bore holes and outpost blast holes in vicinity of a groove head. Clay material is stacked inside the contour. Explosive substances are inserted in bore and blast holes; and explosion is initiated.

EFFECT: reduced time and material costs for preparation of non-combustible material to simultaneous discharge.

1 ex, 2 dwg

 

The invention relates to mining and is designed for emergency situations when a sudden flood from the suppressed workings of the upper horizons through a vertical shaft in the actual production of the lower horizon.

Known method of eliminating vertical shaft, including the overlapping section of the trunk regiment and the filling of the barrel with non-combustible materials (Rules of safety in coal and shale mines. M.: Nedra, 1974, p.48).

The disadvantages of this method are the following. The entrance of large volumes of water in the barrel at her sudden breakthrough eliminates the possibility of erecting a regiment to cover the cross section of the trunk. In dumping of non-combustible material without building regiment he fills the sump and is located above the sump in the form of a cone angle of repose. On the surface of the cone material is ultimate balance and falling on this surface with further filling of the barrel material is easily carried away by water flow, with large kinetic energy. As a result of this whole usuaaly material not retained on the pair, and brought water to produce lower horizon that does not allow you to overlap the section of the barrel and eliminate the sudden breakthrough of water into the current generation.

Known also adopted by the closest analogue of the method of liquidation PR is the gap of water through a vertical shaft (patent RF №2261332, IPC 21F 5/00, 21D 11/38, publ. 27.09.2005, BI No. 27), including the overlapping section of the trunk drop-down regiment, provisional storage of non-combustible material above the regiment to the extent necessary for the simultaneous reset, which is determined from the expression

V=S(l+h+2d)+bh2ctgϕ,

where S is the cross section of the trunk in the light;

l is the depth of the sump;

h - the height of the pair of trunk;

d is the diameter of the trunk in the light;

b - width of the pair of trunk;

ϕ - the angle of repose of non-combustible material and noncombustible material consists of granular and clayey parts that are warehoused in layers, and the volume of clay part is equal to the pore volume of the loose parts, additionally, the subsequent discharge of non-combustible material continue in amounts not smaller volume of water.

The disadvantage of this method is the considerable time and expense to prepare for the simultaneous discharge of non-combustible material in the barrel associated with the manufacture and installation of special drop-down shelf, as well as with production, transportation and storage of non-flammable material.

The objective of the invention is to reduce time and material costs in the period of preparation for simultaneous discharge of non-combustible material in the barrel.

To obtain the desired technical effect in the known method, including overlapping brings the I-stem regiment, pre-determining the amount of non-combustible material, warehousing clay material, the simultaneous discharge of non-combustible material and subsequent discarding of non-combustible material in amounts not smaller volume of water, offers an array of rocks in the vicinity of the mouth of the barrel to Buriti wells and counting the holes, to store the clay material with the inner side of the contour on the surface, to be placed in wells and bore-holes with explosives and trigger the explosion, and the volume of the clay material Vgto determine the expression

n - factor residual loosening the broken rocks falling into the trunk;

d is the diameter of the trunk in the light.

It is the overlapping section of the trunk regiment, production of granular pieces of non-combustible material of the rock mass near the mouth of the barrel and warehousing clay part to the extent necessary for creating a waterproof tube only in the trunk above the pair provides the reduction of time and material costs at the stage of execution of works on preparation for simultaneous discharge of non-combustible material in the barrel.

The invention is illustrated by drawings, where:

figure 1 shows a vertical section of rock at the mouth of the barrel with the location of wells, contouring the hole is and clay in part of non-combustible material;

figure 2 is a vertical section of the trunk at the site of pairing it with the workings of the current horizon after the simultaneous discharge of the material.

The method is implemented as follows. With a sudden breakthrough of water into the barrel 1 (Fig 1) above its mouth 2 mounted light shelves 3 (of beams with solid flooring) with enclosure 4. In the mountain array 5 in the vicinity of the barrel 1 drilling of wells 6 and counting the holes 7 perebiraniem wells 6 beyond the contour 8 of the planned destruction of rocks. The amount of perebor wells shall be appointed taking into account the utilization of the wells. The volume of rock fracture and lining 9 of the barrel Vmtaking into account the coefficient of the residual opening is made equal to the volume required for reliable shutoff section of trunk

Vmn=S(l+h+2d)+bh2ctgϕ,

where n is the ratio of the residual loosening the broken rocks falling into the trunk, n=1,08;

S - section of the trunk in the light;

l is the depth of the sump;

h - the height of the pair of trunk;

d is the diameter of the trunk in the light;

b - width of the pair of trunk;

ϕ - angle of repose collapsed rocks.

To improve separation of rock from the array and caving it in the trunk inclination angle forming cone collapse from the vertical equals

where ρ - the angle of internal friction of the powder is rock solid ρ≈30-35°.

In wells 6 and the holes 7 are placed explosives and triggering facilities (e.g., electric detonators) and collect the electrical circuit, through which the switch is connected to the current source. Use electric detonators with delay so that the collapse of the rocks took place in several stages, evolving from the trunk lining to the side of the mountain massif. For the destruction of the shelf 3 use overhead charges, which are also connected in common explosive power grid and will be blasting from the wells of the first stage (without slowing down). After taking measures to prevent violations of the explosive chain produce warehousing clay part 10 non-combustible material on the inner side of the contour 8 of the collapse of rocks on the surface. Volume Vgclay part 10 of the material is determined from the expression

where n is the porosity of the granular part (collapsed rocks and lining corner, sealed in the fall in the trunk).

Closure of the electric blast network produce blasting shelf, trunk lining and rocks in the path of collapse.

Destroyed by the explosion of the lining of the trunk, shelves, rocks and clay of the material obrushayutsya in the trunk of a continuous stream, thus slowing precluded the formation of the tube at the mouth of the barrel and this reduced the economic effect of mass explosion. Clay part of the material has been coming down with rocks adjacent to the path of collapse on the surface and exploded in the last turn, creating a waterproof jumper 10 height 2d (figure 2) in the barrel above the pair, which relies on a loose part in the sump 11, and a pair of 12 non-combustible material obtained by the explosion of rock collapsed into the barrel in the previous stages of break-down.

Further filling of the barrel with non-combustible material is performed after the fencing of dangerous areas in the path of collapse by schreberiana.

An example of the method. When breakthrough of water through a vertical ventilation shaft diameter in light of 4.0 m and a cross-sectional area of 12.6 m water production is about 300 m3/min, which creates a threat of flooding of the lower working horizon. According to the formula provided in the prior art, calculate the volume of material required for reliable shutoff section of trunk

Based on the specified volume calculate the volume of rocks and trunk lining, subject to destruction (array)

Vm=V/n=305/1,08=282,4 m3.

By the method of successive approximations, taking ρ=30° and accordingly, the angle at the vertex of the cone is equal todetermine the diameter of the contour of the necessary collapse n the surface D≈ 12 m by the well-known zone settings caving and rock strength and trunk lining calculate the parameters of drilling and blasting works by known methods (number and depth of wells, taking into account the rate of use, distance between wells, the desired charge weight of explosives, the sequence and magnitude of deceleration when the detonations and others).

In accordance with the passport blasting produce drilling and contouring of boreholes, installation of explosive mixtures and installation of blasting agents, and then make storing clay rocks in the amount of

spreading them over a part buranovo array, exploded in the last turn. The blasting array is produced with a delay in tens of milliseconds from the start of the wells immediately adjacent to the trunk (figure 1), then wells 2 and 3-ring and last wells 4 and 5 rings and counting holes. As a result of collapse blasted rocks and placed clay rocks on the desktop horizon creates a waterproof (directly in the barrel) jumper, based on the bulk part of the collapsed rocks.

Thus, liquidated water breakthrough. Next, the barrel is filled with non-combustible material up to the earth surface with the formation of the funnel orosenivariate screen. Backfilling is carried out by schreberiana rocks, discharged at a safe distance from the path of collapse.

In the proposed method, the extraction of granular pieces of non-combustible material is produced directly from the barrel, eliminating transportation costs and reduces the time of preparation for the elimination of breakthrough. In addition, the clay part is stored in smaller quantities than in the known method that also reduces the time and material costs.

The method of liquidation breakthrough of water through a vertical shaft, including the overlapping section of the trunk regiment, pre-determining the amount of non-combustible material, storage of non-flammable material, the simultaneous discharge of non-combustible material and subsequent discarding of non-combustible material in amounts not smaller volume of water, characterized in that the rock mass in the vicinity of the mouth of the barrel amerivault wells and counting the holes, the clay material is warehoused on the inner side of the contour on the surface, placed in wells and bore-holes with explosives and trigger the explosion, and the volume of the clay material is determined from the expression

where n is the ratio of the residual loosening the broken rocks falling into the trunk;

d is the diameter of the trunk in the light.



 

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3 cl, 3 dwg, 1 ex

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SUBSTANCE: method involves drilling injection wells along pit shaft perimeter; widening cracks by supplying high-pressure water and injecting grouting mortar in the cracks; additionally boring vertical preparation well in pit shaft center. Cracks are widened by feeding water and then air or only water in vertical preparation well. Water and air are supplied under pressure lesser than pressure of hydraulic rock fracturing. Grouting mortar is injected in cracks by forcing thereof through injection wells immediately after finishing of feeding water or air in vertical preparation well. Cryogenic gel is used as the grouting mortar. Cryogenic gel is foamed before injecting thereof in wells and foamed cryogenic gel is forced into cracks beyond the pit shaft perimeter by supplying compressed air in vertical preparation well. After leaving pit shaft as it is for grouting mortar setting time wells are sunk for the next grouting step depth and above operations are repeated up to reaching the lower boundary of pit shaft interval, wherein injection is performed under pressure exceeding that on previous step.

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3 cl, 3 dwg, 1 ex

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