SU1434135A1 - Method of shaft drainage - Google Patents

Abstract

The invention relates to a mountainous area and may be. used in the development of mineral deposits.myh to protect the treatment of mine workings from flooding. The purpose of the invention is to increase the efficiency of drainage works and reduce the cost of drainage by ensuring reliable interface between the fracture zone (ST) in the zone of water conducting cracks (TLG) and more fully intercepting the flow of groundwater. In rocky or semi-rocky rocks, water intake is made at a distance from the top of the reservoir, determined from the ratio given in the invention. Uphole wells (C) are drilled out of the workings to the VPT zone for forming 1P1 ST. At the same time, ST are formed anisotropic in permeability with increased permeability of rocks in the vertical direction. In order to reverse the drainage effect, rows C are oriented normally to the groundwater flow in the ATF zone. In this case, C is charged with explosive charges taking into account the specified curvature of the lower ST boundary. By blasting explosive charges form the upper and lower boundaries of the ST. The lower boundary of the ST is formed by a concave zone below the contour of the ADT zone. Water is removed from the ST through the conjugate ust. C. 3 Il. i (L

Description

00

SO JV

I The invention relates to the mining industry V can be used in the development of mineral deposits for the protection of mining sites from watering.

The aim of the invention is to enhance; drainage efficiency and reduction of costs for drainage due to ensuring reliable interface of the fracture zone with the zone of water conducting cracks and more complete interception of the groundwater flow. FIG. 1 shows a diagram of the section of the I-pressing with the passed shchrek and risen wells; in fig. 2 shows a section A -A in FIG. one; in fig. 3 - the site after the formation of the permeability anosotropic fracture zone.

The method is carried out as follows.

In rocky or semi-rocky rocks 1, in the roof of which an aquifer 2 lies, with a pressure of iodine1) 1x water on the supply circuit H ,,,, and on the side-work contour I hg, in the lateral side of the deposit 3 with spent in section 4, water intake processing is carried out: treatment 5 at a distance L from the top of the deposit, determined from the ratio

   . coscx L 1)

: 31P (o () Sin (c - | - / iT)

; where is the height of the block shift zone, m ;.

: HT - height of the water supply zone, m;

: sl - angle of fall of the ore deposit, hail;

 the external relative to the developed area is the angle between the end of the water-conducting zone and the horizon, deg.

The location of the mine 5 at a distance satisfying condition (1) allows in the future to provide the case; junction of fracture zone 6 with zone 7 of water conducting cracks, which is a necessary condition for the most complete interception of the flow of sub-groundwater from the aquifer 2 to the reservoir 3. If the production of 5 is at the distance. 6 trapSl-Hfrfvi-p

The innovation is located in rocks disturbed by the displacement of zone 8 of the block shear and the flow of groundwater through zone 7 of water conducting cracks, mine zone 6 of fracture, enters reservoir 3, i.e. the formation of zone 6 of fracture does not have a drainage effect. If a

51-I ((A + Pt01

xcosoi, fracture zone 6 is not matched with zone 7 of water conducting cracks and due to low water permeability

0

five

0

rock and semi-rock 1 it is impossible to intercept the flow of groundwater.

Rising wells 9 are drilled in order to form fracture zone 6 from generation 5 into zone 7 of water-conducting cracks. The depth of the revolving wells 9 is determined from the need to form a fracture zone of a given height hi and preservation of the mouths of the revolving wells 9 for subsequent organized water drainage to production 5. Production tests It has been established that the length of the UK riser wells 9 should be at least 5 m greater than the height hi of the fracture zone 6 being formed, i.e. satisfy the condition

ler.h- + 5. (2)

The fracture zone is formed by the height determined by the following empirical dependence:

L S in RT

+ m., tg.,, (3)

where is the fracture zone height in the i-th

number of wells, m; I is the order number of a number of wells,

where i 1, 2 ..., p;

- and - the number of rows of wells; fracture zone width, m; f is the angle between the contour of the zone of water-conducting cracks and the horizon, deg; L is a dimensionless empirical coefficient of 0.1; Нр- pressure of groundwater on the supply circuit, m;

lij- groundwater pressure on the contour of the aquifer processing, m;

LX is the distance from the contour of the aquifer to the contour of its aquifer, m;

 power of the aquifer produced, m, where, 2, and m

M for pressure aquifer, Mi,

M. - for a non-pressurized aquifer, and pyrene, determined by empirical dependence

Ng

cL

.h.M. - iWilWaEl (4)

lV.

Kb- 1.

where c is a dimensionless empirical coefficient equal to 0.8;

WE moisture content of dried ore in the rock massif, the proportion of units; , Р - average daily productivity of the cleaning unit (slaughterhouse), M / CVT;

 the length of the zone of trushinosity along the strike of the ore deposit, m; K-filtering ratio of the aqueduct being developed, m / day;

 W (- moisture content of broken ore, the share of units, where 1 1.2, and the moisture content of broken ore is chosen from the conditions

iW Wb, if the moisture content of the ore is not normalized, Wj WT, if the moisture content of the ore is normalized,

where Wb is the moisture content of the broken ore, at which hydrogeological complications begin to appear, the proportion of units;. WH-standard moisture repulsed ore, the share of units

The length 1, zone 6 of trechinovost along the strike of the deposit 3 is taken to be equal to the length of the mining area protected from flooding. The fracture zone 6 of the above geometrical parameters (h, m, i) is formed anisotropic in permeability with increased permeability of rocks in the vertical direction and alternation of well-permeable areas with low-permeable areas in the direction of groundwater flow in zone 7 of water-conducting cracks. For this, the revolving wells 9 are arranged in rows, the distance between them is chosen to be equal to

Rp l, (5)

where Pp is the distance between the rows of wells, m;

well spacing in

r d, m

In case there are two rows of revolving wells 9 on the inner and outer contours of fracture zone 6.

In order to increase the drainage effect by preventing the fracture zone 6 from anisotropic in the direction of flow, the row filtration properties of the revolving wells 9 are oriented normal to the flow of groundwater in the zone 7 of water conducting cracks. The distance between the rising wells 9 (Re) in rows is determined by a known technique.

The wells 9 are charged with explosive charges from the bottom to a height h, taking into account the specified curvature of the lower boundary of the fracture zone 6. The formation of cracks of predominantly vertical orientation can be accomplished, for example, by installing pipes with cuts in the well 9 in the charge location zone. In the lower part 10 of the well bore 9, the pipe is left deaf. The slits in the pipe are oriented normal to the flow of groundwater in zone 7 of water conducting cracks.

Then, by directional blasting of explosive well charges, an area is formed

6 fracture, anisotropic in permeability, with coverage of two zones; zones 7 of water-conducting cracks and the underlying low-permeable forges: rocks 1. In this case, the lower boundary of the fracture zone forms a zone of water-conducting cracks concave below the contour.

Q Water from the water-processing aquifer 2 through zone 7 of water-conducting cracks enters the zone 6 of fracture (the path of the zone is indicated by arrows), anisotropic in permeability, and through deaf casing of the preserved wells of the revolving wells 9 enters the mine workings 5. Next For mining, water is directed to a mine drainage installation.

When water is threatened, the site where the drainage is carried out is isolated from the rest of the workings with waterproof jumpers.

Formation of anisotropic permeability of the fracture zone with vertical permeability in the vertical direction with partial coverage of two zones (zones of water conducting cracks 7 and underlying low-permeability rocks 1) junction of fracture zone 6 with zone 7 of water conducting cracks, making the bottom

0 boundary of fracture zone b concave shape and its placement below boundary 1 of the zone of water-conducting cracks 7 provides a more complete interception of groundwater flow from the water-producing aquifer 2 into the reservoir 3. Formation of zone 6 fractures with design parameters (length, width, height) as well as filtration properties varying along the groundwater flow in the zone

7 conductive cracks (alternation of well-permeable and low-permeable rocks) will allow for the technical optimization of mine drainage.

Claims (1)

Invention Formula 5 Mine drainage method, which includes water intake generation, drilling of ascending wells from it into rock and semi-rock, charging wells with explosive charges, forming a fracture zone with formation of its upper and lower boundaries by blasting explosive charges of explosives and draining water from the fracture zone through conjugated wellheads, characterized in that, in order to increase the efficiency of drainage operations 5 and reducing the cost of drainage by ensuring reliable interface of the fracture zone with the zone of water-conducting cracks and more complete interception of the flow 0 groundwater, water intake production is carried out at a distance LOT of the roof of the reservoir, determined from the H, Hj- Nod 81p (o +) sin (o (+; 3t) where Hj is the height of the block shear zone of rocks, m; ; Нт-height of the zone of water-conducting treIonine, m; o (angle of adeny deposits, hail;  the angle between the contour of the zone of water-conducting cracks and the horizon, external to the worked-out area, hail, zones of fracture form at every ujare the development of zones of water-conducting cracks that are anisotropic in permeability with increased permeability of rocks in the vertical direction cracks. Y //, /// U //. /// /// y //, - ///: ///: /// /// ///