EA020421B1 - Method for preventing mine flooding in underground potash salt mining in case of ground water influx into mine - Google Patents

Abstract

The invention relates to mining and may be used in underground potash salt mining to prevent mine flooding in case of ground water influx into mine through water-conducting fractures in geological fault zones exposed by underground workings. The object of the invention is to reduce expenses and improve reliability of potash mine flooding prevention in case ground water penetrates into mine through water-conducting fractures in geological fault zones exposed by underground workings. The formulated problem is solved as follows: in method of potash mine flooding prevention in case ground water penetrates into mine which includes identification of geological fault zone boundary, surface borehole drilling, tubing, infusion of hardening water-insoluble materials through boreholes, borehole axis is directed to a point located at underground working path in front of the stope of this working, hardening materials are infused at regular intervals, after borehole is drilled for a length equal to depth of hardening material penetration into rock mass in front of borehole stope, final length of the borehole is taken equal to depth of underground working with respect to the surface, and distance between stope of underground working and borehole is determined by calculation.

Description

The invention relates to the field of mining and can be used in underground mining of potash salts to prevent flooding of mines during breakthroughs into the mine groundwater through water-supply cracks in zones of geological disturbances uncovered by underground mine workings.

There is a method of preventing flooding of potash mines during breakthroughs in the underground water mine [1], including the construction of bridges from hardening materials in underground mine workings, for example, sand-cement mixtures, for waterproofing water entry points. The disadvantages of this method are the high cost of erecting jumpers and a short service life, which is associated with intensive dissolution of salts at the junction of the jumper with the host salt rocks and the subsequent flow of water into the mine between the jumpers and the rock circuit.

A known method of preventing flooding of potash mines during breakthroughs into the mine groundwater from geological disturbances [2], including determining the location of the geological disturbance and the places of water flow into the underground mine, drilling from the earth's surface to the underground mine workings, fixing (casing) of wells with pipes, injection through wells into underground openings of hardening insoluble filling materials not soluble in water until filling underground workings at the place of supply of filling materials to their entire height and Ania resulting in the workings of waterproofing of concrete bridges. The disadvantages of this method are the significant costs of its implementation, due to the large amount of work on the creation of waterproofing concrete lintels; as well as its low reliability, which is associated with intensive dissolution of salts at the junction of the jumper with the host salt rocks and the subsequent flow of water into the mine between the jumper and the rock contour.

The objective of the invention is to reduce costs and increase the reliability of preventing flooding of potash mines during breakthroughs in the underground water mine through water-supply cracks in zones of geological disturbances exposed by underground mine workings.

This object is achieved in that in a method of preventing flooding of potash mines during breakthroughs into a groundwater mine, including determining the boundaries of a geological disturbance zone, drilling a well from the earth's surface, fastening wells with pipes, injecting hardening materials that are not soluble in water, and the axis of the well when it is drilling is directed to a point located on the route of underground mining ahead of the bottom of this mine, hardening materials are injected through the well periodically, according to after drilling a well to a length equal to the depth of penetration of the hardening material into the rock mass ahead of the bottom of the well, the final length of the well is taken equal to the depth of the underground working from the surface of the earth, and the distance from the bottom of the underground working to the well is determined from the expression a <b <t, where B is the distance from the bottom of the underground mine to the well, a is the width of the underground mine, g is the depth of penetration of the hardening material into the rock mass in planes parallel to the bedding planes.

The essence of the proposed method to prevent flooding of potash mines during breakthroughs in the underground water mine is illustrated by the scheme shown in the drawing.

On the drawing are indicated: 1 - underground development, 2 - bottom of the underground output (place of entry into the development of 1 groundwater from the zone of geological disturbance), 3 - boundary of the zone of geological disturbance, 4 - well, 5, 6, 7 and 8 - location of the face wells 4, during which hardening material was injected through well 4 into water-conducting cracks of the rock mass, 9 boundaries of the rock mass region into which the hardening material was injected, 10 earth surface, g - depth of penetration of the hardening material into the native mass in planes parallel to the bedding planes, b is the distance from the bottom of the underground mine to the well, b is the depth of penetration of the hardening material into the rock mass ahead of the bottom of the well.

The method is as follows.

The boundaries of 3 zones of geological disturbance are determined. Drill a well 4 from the earth's surface 10. The axis of the well 4 during its drilling is directed to point A, located on the route of underground mining 1 ahead of the face 2 of this generation. Well 4 is fixed with pipes, for example metal.

Injection of 4 hardening materials through the well is carried out periodically, after drilling 4 to a length b equal to the depth of penetration of the hardening material into the rock mass ahead of the bottom of the well 4. So, for the first time, the hardening material is injected through the well 4 when its bottom is in position 5, the second time - when the bottom of the well 4 is in position 6, the third time - when the bottom of the well 4 in position 7 and so on.

The final length of the well 4 is taken equal to the depth H of the location of the underground mine 1 from the surface of the earth, while the distance from the bottom 2 of the underground mine 1 to the well 4 is determined from the expression

- 1 020421 a <b <t, where b is the distance from the bottom of the underground mine to the well, a is the width of the underground mine, g is the depth of penetration of the hardening material into the rock mass in planes parallel to the bedding planes.

When the condition a <b is fulfilled, in combination with assuming that the length H of the well 4 is equal to the depth of the underground mine 1 from the surface, it is possible to completely fill the water-bearing cracks with the hardening material between the well 4 and the bottom 2 of the underground mine 1 that revealed the geological disturbance .

If the condition b <m is fulfilled, a waterproof area of the mountain range will be in front of the bottom of the underground mine.

The parameters b and g, the knowledge of which is necessary when applying this method, are determined in each specific case using well-known techniques, taking into account specific mining and geological conditions of mining, filtration and strength properties of the rock mass within a geological disturbance.

Compared with known methods, the inventive method of preventing flooding of potash mines during breakthroughs into a groundwater mine allows:

1) to increase the reliability of preventing flooding of potash mines during breakthroughs of underground water into a mine through water-supply cracks in zones of geological disturbances uncovered by underground mine workings;

2) significantly reduce the costs associated with the implementation of measures to prevent flooding of potash mines.

The inventive method is intended mainly for use in the development of potash deposits.

Information sources

1. Patent KI No. 2219350, publ. 12/20/2003.

2. Patent KI No. 2341658, publ. 12/20/2008.

Claims (1)

CLAIM A method of preventing flooding of potash mines during breakthroughs into a groundwater mine, including determining the boundaries of the geological disturbance zone, drilling wells from the earth's surface, casing wells with pipes, injecting hardening materials not soluble in water, characterized in that the well is drilled in a direction such that its axis passes through a point located on the route of underground mining ahead of the bottom of this mine; hardening materials are injected through the well in stages, alternating with by drilling a well to a length equal to the depth of penetration of the hardening material into the rock mass ahead of the bottom of the well, while the final length of the well is taken equal to the depth of the underground working from the surface of the earth, and the distance from the bottom of the underground working to the well is determined from the expression a <b <t, where B is the distance from the bottom of the underground mine to the well, a is the width of the underground mine, g is the depth of penetration of the hardening material into the rock mass in planes parallel to the bedding planes.