Method of prevention of flooding of potassium mines and hazardous deformations of earth surface at underground water inrush into mines

FIELD: mining.

SUBSTANCE: method comprises leaving of massifs of minerals 14 between chambers 7-13, driven at extraction of potassium salt bed 1, and filling chambers with backfill material. Bores 6 are drilled from ground surface 5 to chambers; the bores are cased with tubes. Not soluble in water backfill material is supplied into chambers via bores 6 till chambers are filled for their complete height at a point of backfill material supply. The first to be filled are chambers 7 located at proximity to the underground water inrush zone 4 from the side of the bed rise 1 of potassium salt; thereafter filling of chambers 8-10 located below underground water inrush 4 is carried out. Not solved in water, hardening, backfill materials are supplied into chambers 7-13 via bores 6. If filed chambers driven along the course of bed chambers have considerable length, the distance between bores is determined from a calculated expression.

EFFECT: invention facilitates prevention of flooding of potassium mine and hazardous deformation of the earth surface at breaks of water protective strata and underground water inrushes into mine through water permeable cracks generated in water protective strata in areas of geological disturbances.

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The invention relates to mining and can be used in underground mining of potassium salts.

Known way to prevent flooding, potash mines and dangerous deformations of the earth surface by the outburst of groundwater in potash mines (Way to prevent flooding of potash mines. RF patent №2133342 on application No. 97113888/03 from 13.08.1997. Authors: Paulov L., Nikolaev A.S., Belkin CENTURIES), including drilling from the surface of the wells to the upper contact of the water conveyance channel between the aquifer and mine workings. In drilled wells determine the level of the brine. In one of the wells located upstream of the brine, pumped cement slurry. From the other wells pumping the brine. The injection of cement slurry and pumping of brine are continuously with constant flow rates, the flow rate of pumping exceeds the rate of pumping 3-4 times. The disadvantage of this method is the low reliability prevent flooding, potash mines and dangerous deformations of the earth surface, which is associated: with the difficulty of positioning the upper contact of the water conveyance channel between the aquifer and mine workings; the inability to completely prevent the entry of water into the underground mine workings and the destruction of the security pillar in the races is of its salts present in them.

There are ways to help prevent flooding in the potash mines and dangerous deformations of the earth surface by the outburst of groundwater in potash mines (Way to develop gentle potash seams excavation blocks. Patent No. 2060389 on the application 5033860/03 from 10.02.1992. Authors: Paulov L.M., Parfenov V.B. have been, Gorkovenko V.N., Artemov VG, Palianina GD, Volkov Dmitriy E.V.; W. Entwicklungstendenzen im Untertagebereich West des-Deuschen Kalibergbaus. Kali und Steinsalze., 1975, Vol.6, No. 3. S. 375-382). These methods include the seam potassium salt chambers for separation between cameras, columnar, and on the borders of mined blocks - barrier pillars fossil. The disadvantage of these methods is their low reliability when developing potash seams in areas of mine fields in complicated geological disturbances.

The known method, adopted as a prototype, prevent flooding, potash mines and dangerous deformations of the earth surface by the outburst of groundwater in potash mines (RF Patent No. 95118809 on application No. 95118809/03 from 31.10.1995. Authors: Shaman G.P., Markov V.E., Nesterov BTW, Vorontsov VI, Anikin NF, Sivkov B.C.), including the seam potassium salt chambers for separation between cameras pillars of minerals and the subsequent laying of the cameras solid salt waste rock and rock salt)obtained in the excavation and remanaging workings.

The disadvantage of this method is the low reliability prevent flooding of the mine and dangerous deformations of the earth surface by the outburst of underground waters (brines) from aquifers in mines, passed through the formation of the potassium salt, water conveyance through the cracks formed in the water strata in places of geological faults.

This is because water (brines), coming from aquifers in the camera, leads to the destruction mezhdurebernyh pillars and backfill array consisting of a water soluble salt rocks. The consequence is the collapse of the rocks overlying strata and dangerous deformation of the earth surface (down in the troughs displacement, cracking, cratering and failures, destruction of terrestrial plants). So, the flooding of the mine Fineburg (Germany) on the earth's surface caused the crater to a depth of 30 m and a diameter of about 100 m In the Verkhnekamskoe potash over flooded in 1986, the mine-3 formed a vast and deep failure depth of tens of meters.

The technical result achieved when using the proposed method, is to eliminate the disadvantage of the prototype method, namely the prevention of flooding potash mine and dangerous deformation the Nations of the earth surface at the fracture water column and breakthroughs in the mine groundwater water conveyance through the cracks, formed in the water strata in places of geological faults.

The technical result is achieved by the inventive method to prevent flooding of the mine and dangerous deformations of the earth surface by the outburst of groundwater in potash mines includes giving between cameras, passed during the mining of seam potassium salt, pillars of minerals and filled chambers backfill material.

According to the invention from the surface through cameras drilled wells, the wells grow tubes through the holes in the camera serves nerastvorim in the water filling materials to fill the chambers in the place of submission of backfill materials the entire height of the camera, and the first lay cameras located in the immediate vicinity of the zone breakthrough groundwater from the uprising of the formation of the potassium salt, then make a bookmark chambers located beneath the area of the breakthrough of groundwater.

To improve the efficiency of the proposed method by wells in the camera serves nerastvorim in water hardening filling material.

When the tab is passed along the strike of the formation of chambers of great length, the distance between the wells is determined from the expression

S≤2εCR·ctgϕ,

where: S is the distance between the wells,

εCR- maximum the transmission of rocks water column, above the backfill array, above which there is destruction of the water column with education in her water conducting fractures,

ϕ- the spreading angle of backfill material in the mine workings.

The essence of the proposed method is illustrated by drawings presented on figure 1 and figure 2.

Figure 1 shows a schematic diagram (vertical section) of cameras, mezhdurebernyh pillars and wells for the supply of filling material in the chamber.

Figure 2 shows a schematic diagram (vertical section) of the mutual location of wells in the supply of filling material in the chamber length, traversed along the strike of the formation.

Figure 1 and figure 2:

1 - Plast potassium salt; 2 - lower limit of the goaf; 3 - upper limit goaf; 4 - zone breakthrough groundwater (water conducting fractures in the water thicker); 5 - the earth's surface; 6 - hole to feed backfill materials; 7-13 camera (camera 7 is filled insoluble in water backfill material); 14 - Mezhdunarodnye pillars; and the width of the camera; b - a part of a mine field, located by the fall of the formation of the potassium salt from the zone breakthrough groundwater; - a part of a mine field, located with hand uprising of the formation of the potassium salt from the zone breakthrough underground is od; α - the angle of incidence of the formation of the potassium salt; h1- power rock water column; h2- the power of rock aquifer.

The method is as follows.

Between cameras 7-13, passed during the mining of seam potassium salt, leave pillars of minerals 14. From the surface 5 to cameras drilled wells 6, which grow tubes (e.g., metal). Wells in the camera serves nerastvorim in the water filling materials (e.g. sand, slag and other) to fill the chambers in the supply of filling material (pairing the camera and wells a and b) on their entire height. When it first put the camera 7 (figure 1), located in close proximity to areas of breakout 4 groundwater from the uprising of the formation of the potassium salt. After filling the filling material cameras produce 7 tab 8 cameras located directly beneath the area of the breakthrough 4 groundwater.

To improve the efficiency of the proposed method by wells in the camera serves nerastvorim in water hardening filling material (e.g. sand-cement mixture or hardening of the mixture on the basis of tailings).

When the tab is passed along the strike of the reservoir chambers of the great length of the distance S (figure 2) between the wells is determined from the expression

S≤2εPR ·ctgϕ,

where: S is the distance between the wells,

εCR- maximum allowable lower rocks of the water column above the backfill array, above which there is destruction of the water column with education in her water conducting fractures,

ϕ - the spreading angle of backfill material in the mine workings (the angle between the horizontal plane and the surface of the backfill array 15 (2)).

When laying cameras great length traversed along the strike of the seam, lower the rocks the water column at the point D (figure 2) should not exceed εCR.

Drilling and filing with the camera nerastvorim in the water filling materials to fill the chambers in the supply of filling material on the whole of their height allows to exclude hazardous quantities of lowering of the roof rocks develop potash layers, and hence the earth's surface, above the goaf in cases of penetration into the mine groundwater. The cased hole pipes eliminates the admission chamber water wells.

First lay the chamber (7)located in the immediate vicinity of the zone breakthrough 4 groundwater from the uprising of the formation of the potassium salt. This eliminates the possibility of water ingress in the old part of the mine field (figure 1), the location is nnow from the uprising of the formation of the potassium salt from zone 4 breakthrough groundwater and the destruction of the pillar 14 by dissolving water-salt rocks. After laying the camera (cameras) 7 produce a bookmark of the camera (cameras) 8, located directly beneath the area of the breakthrough 4 groundwater, which reduces the tributaries water (brine) in the underground workings of the mine, and therefore the intensity of dissolution of salt rocks.

Improving the efficiency of the proposed method when used for bookmarks cameras nerastvorim in water hardening filling material (e.g. sand-cement mixtures) because this increases the reliability of the exceptions dangerous lowering of rocks in the water column and prevent the ingress of groundwater through filling the array in the camera, not filled with backfill material.

The condition S≤2εCR·ctgϕ when laying passed along strike cameras large length excludes the possibility of dangerous lowerings (εCRrocks water column at points equidistant from adjacent wells (point D, figure 2), above which there is destruction of the water column with education in her water conducting fractures.

Compared with the known methods, this method allows to reduce the probability of flooding potash mines and eliminate dangerous deformation of the earth surface when the PoWPA the I-V characteristics of groundwater in underground mining water conveyance through the cracks, formed in the water strata in places of geological faults.

Positive economic benefit gained through the implementation of this method, due to: conservation of potash reserves and providing opportunities for further work profitable mines, to reduce the negative impact of water breakthrough in the potash mines in the state of the earth's surface and the environment.

The inventive method is intended primarily for use in underground mining of deposits of potassium salts.

The parameters required to implement the proposed method, namely, the angle of spreading ϕ backfill material in the mine workings and the maximum lowering εCRrocks water column above the backfill array, above which there is destruction of the water column with education in her water conducting fractures, determined in each case by known methods using mine, laboratory or analytical studies.

1. The way to prevent flooding potash mines and dangerous deformations of the earth surface when breakthroughs in the mines groundwater, including abandonment between cameras, passed during the mining of seam potassium salt, pillars of minerals and filled the chambers of filling material, characterized in that the surface of the earth to cameras drilled wells, the wells grow tubes through the holes in the camera serves not dissolved in the water filling materials to fill the chambers in the place of submission of backfill materials the entire height of the camera, and the first lay cameras located in the immediate vicinity of the zone breakthrough groundwater from the uprising of the formation of the potassium salt, then make a bookmark chambers located beneath the area of the breakthrough of groundwater.

2. The method according to claim 1, characterized in that the wells in the camera serves not dissolved in water hardening filling material.

3. The method according to any one of claims 1 and 2, characterized in that when the tab is passed along the strike of the reservoir chambers large length, the distance between the wells is determined from the expression

S≤2εnp·ctgϕ,

where S is the distance between the wells,

εnp- maximum allowable lower rocks of the water column above the backfill array, above which there is destruction of the water column with education in her water conducting fractures,

ϕ - the spreading angle of backfill material in the mine workings.



 

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