Rock pressure control method

FIELD: mining.

SUBSTANCE: method includes driving of development-temporary workings, working off of primordial chambers of tapered section, their filling with curing mixture forming artificial pillars, formation of massive ore pillar between artificial pillars. Rock pressure is reallocated on artificial pillars. Touchdown working is driven along ore pillar symmetry axis by contact with ore deposits in overlying roof rocks. Blasting wells are drilled from it radially within outlines of natural arches so that ends of these wells most accurately form sizes and surface of line of natural arches in compliance with estimated ultimate strength of overlying rock massif. Complete discharge of massive ore pillar is performed by induced caving of roof rock between artificial pillars on chambers expanding upwards, support of artificial pillars by caved rock is provided. Massive ore pillar stocks are developed with support of overlying roof rock by natural arches resting upon artificial pillars and retaining slopes formed near side surfaces of artificial pillars during loading of broken ore.

EFFECT: increasing reliability of rock pressure control and labour safety.

2 cl, 4 dwg

 

The technical solution relates to the mining industry and can be used for management of mountain pressure in underground development of horizontal and sloping ore deposits.

There is a method of management of mountain pressure (A.S. USSR №998759, E21C 41/06, publ. in BI No. 7, 1983), including the maintenance of overlapping species ore and artificial pillars of hardening bookmarks, the collapse of rocks and mining excavation area cameras with redistribution of rock pressure artificial pillars, and in the centre of the excavation area leave massive ore pillar, and after working the whole part of the produce tab chambers located on either side of him, and then carry out the excavation of a massive pillar.

The disadvantages of this method are the loss of ore in mezhdurebernyh ore reserves, the ability of dynamic manifestations of rock pressure in the destruction of these pillars pressure of overlapping species and the possibility of air strikes on business horizons when Samoobrona roof rocks, which adversely affects the safety of underground workers.

The closest in technical essence and essential features to the proposed technical solution is the method of controlling rock pressure (A.S. USSR №1606667, AS 41/16, publ. in BI No. 42, 1990), including maintaining patient the surrounding rocks artificial pillars of the hardening of the mixture, the formation of mining the ore massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars of the mining stocks massive ore pillar and the collapse of the roof rocks, and artificial pillars and the Central part of the massive ore pillar first load testing cameras its boundary parts of the artificial pillar, and then produce a complete unloading massive ore pillar forced the collapse of the roof rocks between artificial pillars formed on the camera, this creates a backwater artificial pillars collapsed rocks, and then work out fully the massive reserves of ore pillar with the formation of the side surfaces of the artificial pillar retaining slopes.

The main disadvantage of this method is the high irregularity of the workings of the roof rocks above artificial pillars of the hardening mixture that creates high stress concentration around these workings and the probability of dynamic manifestations of rock pressure in mines during operations on the forced collapse of overlapping species. In addition, the location of drilling workings on artificial pillars of the hardening of the mixture does not faithfully reproduce well the contours of the set of natural balance rocks on the massive ore entirely.

Mining practice shows (Kartozia B.A., V.N. Borisov. Engineering problems of the mechanics of underground structures: a Training manual. 2nd ed., revised and enlarged extra - M.: Publishing house of Moscow state mining University, 2001, p.12)that the sets of natural balance in rocks, usually formed by a parabolic surface. The height h of the code of the natural equilibrium depends on the tensile strength of rocks.

When implementing a known method of controlling rock pressure get in overlapping rocks arch atroveny shape, which is formed of flat lateral surfaces and is not a true arch natural equilibrium. This can lead to Samoobrona rocks over a large area before they reach the true arch form natural equilibrium and, consequently, to the air strikes in the mines.

Thus, not sufficiently accurate formation of the arch of the natural equilibrium in the overlapping rocks does not provide sufficient reliability management of mountain pressure in a known technical solution. The dynamic manifestations of rock pressure and collapse of the roof rocks negative impact on safety.

Technical problem - increasing reliability of control of mountain pressure due to more accurate formation of the arch of the natural equilibrium in the overlapping rocks and is improving safety by reducing the likelihood of dynamic manifestations of rock pressure and mass collapses.

The problem is solved in that in the method of controlling rock pressure, including the sinking of training and development workings, mining primary camera trapezoidal sections and filling them hardening the mixture with the formation of the artificial pillar, the formation of massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars partial mining stocks edge parts of the massive ore pillar extending up cameras in artificial pillar, holding a boarding production in caving the roof rock, the drilling of her blastholes within the arch of the natural equilibrium of overlapping roof rocks above the massive ore as a whole, complete unloading massive ore pillar forced the collapse of the roof rocks between artificial the pillars extending up to the camera, creating a backwater artificial pillars collapsed rocks and mining stocks massive ore pillar with maintaining overlapping species of the roof arch natural equilibrium, based on artificial pillars and formed at side surfaces of the artificial pillar in the process of shipment of broken ore retaining slopes, in accordance with the proposed technical solution boarding the production takes place along the axis of symmetry of the masses of the main ore pillar in contact with the ore Deposit, and blastholes from boarding generate Buryats radially so that the ends of these wells accurately formed to the dimensions and the surface contour of the specified set of natural balance in accordance with the calculated tensile strength of the array of overlapping species.

Conducting boarding develop along the axis of symmetry of the massive ore pillar in contact with the ore Deposit allows you to place it outside the zones of high stress concentration created by the redistribution of rock pressure on the artificial pillars partial depletion of reserves massive ore pillar. This reduces the likelihood of dynamic manifestations of rock pressure in boarding developing during work on forced collapse. In addition, there is no need to perform two types of planting mines (known in technical decision - drifts and russeck), which further reduces the stress concentration around the landing generation and reduces the total cost of conducting a boarding workings and drilling blastholes 10÷12%.

Blasthole drilling out of the housing production in the radial direction and more precise control of the length and angles of the blastholes most accurately to form any size and surface contour of the arch e the natural balance in accordance with the calculated tensile strength of the array of overlapping species.

The combined effect of the above distinctive features allows you to achieve the solution of a technical problem of increasing the reliability of control rock pressure due to more accurate formation of the arch of the natural equilibrium in the overlapping rocks and increase safety by reducing the likelihood of dynamic manifestations of rock pressure and mass collapses.

Suitable partial mining stocks edge parts of the massive ore pillar extending up cameras at the adjacent artificial pillars be implemented in such a way that the camera positioned on the same stages of testing, form a terraced front of wastewater treatment works.

This further reduces the stress concentration along the front of the treatment works, reducing the likelihood of dynamic manifestations of rock pressure and mass collapses, resulting in increased safety.

Thus, the combined effect of the above signs provides the most effective solution to the problem.

The essence of the technical solution is illustrated for the control of rock pressure in underground development of horizontal ore deposits and drawings, in which figure 1 shows a vertical section of the ore body orthogonal to the direction of advancement of the front of istih works (section a-a in figure 2) at the time of drilling operations on the set of natural balance over extreme massive ore as a whole. figure 2 - plan of horizon edition (cross-section B-B in figure 1); figure 3 - the same section a-a in figure 2 at the time of completion of the arch natural equilibrium over at massive ore wholly and holding brown-heading openings therein; figure 4 is the same section a-a in figure 2 at the time of practicing extreme massive ore pillar.

The proposed method is implemented as follows.

Ore deposits 1 (1) receive training and rifled generation 2 and work out the primary chamber 3 a trapezoidal cross-section (figure 2) at full capacity ore deposits 1 brown-explosive way. After a failover of the primary chamber 3 a trapezoidal cross-section over the entire length of z, they are filled with hardening the mixture with the formation of the artificial pillar 4, between which is formed a massive ore pillar 5, parallel to the front 6 of the treatment works. Redistribution rock pressure on the artificial pillars 4 produce partial mining stocks edge parts of the massive ore pillar 5 extending up by the camera 7, the artificial pillar 4 (figure 1). To ensure the safety of artificial pillar 4 should preferably be drilling wells 8 and blasting layers (figure 2) with a mechanical release and shipment of broken ore 9.

After redistribution of rock pressure artificial pillars 4 are boarding the production of 10 the overlapping rocks 11 along the axis of symmetry of the massive ore pillar 5 in contact with the ore Deposit 1. From boarding generate 10 Buryats radially blastholes 12 within the vault 13 natural equilibrium overlapping species 11 above the massive ore entirely 5. Blastholes 12 Buryats so that their ends most accurately formed to the dimensions and the surface contour of the arch 13 natural balance in accordance with the calculated tensile strength of the array of overlapping species 11. For the forming of span L arch 13 natural equilibrium (figure 1) above the massive ore wholly 5 height h of the arch 13 natural equilibrium will be determined by the known formula:

h=L/2f

where f is the fortress of overlapping species 11 on a scale professional Dev (f=R/10);

R is the calculated resistance of overlapping species 11, MPa.

Blastholes 12 have different lengths. The minimum length lminwill have vertical blastholes 12 (1):

lmin=h-hin,

where hin- the height of the planting production 10.

The maximum length lmaxwill have a blast holes 12 extending up over the chambers 7:

lmax=(0,25L2-W2)0,5-0,5bin,

where W is the length of the line of least resistance;

bin- the width of the planting production 10.

The angle α between the explosive wells 12, respectively, are determined from the relation α=arctan (W/h).

Then make a forced collapse of overlapping species 11 is rowly between artificial pillars 4 extending up camera 7, as a result, achieved full unloading massive ore pillar 5. Collapsed rocks 14 fill extending up camera 7 (figure 3), creating a backwater for artificial pillar 4. The massive reserves of ore pillar 5 work under the collapsed rocks 14, after which the developed space 15 remain formed at the side surfaces of the artificial pillar 4 retaining slopes 16 (figure 4) and maintaining the overlapping species 11 of the roof is vault 13 natural equilibrium, based on artificial pillars 4 and formed at their side surfaces in the process of shipment of broken ore 9 retaining slopes 16. Powerful enough for ore deposits 1 massive ore pillar 5 practice with division into padati, drilling wells 8 and blasting from brown-heading openings 17. After full testing of massive ore pillar 5 over the entire length of z, the front 6 of the treatment works is shifted to the right and the cycle of operations management rock pressure in underground development ore deposits 1 is repeated.

It is advisable the breaking of the ore Deposit 1 in the adjacent massive ore pillars 5 lead the way (figure 2), extending up to the camera 7 is positioned on the same stages of testing, form a terraced front 6 sewage treatment works. This reduces the stress concentration along this front 6 treatment p the bot on artificial pillars 4 25÷30%, resulting in further improved safety.

1. The method of controlling rock pressure, including the sinking of training and development workings, mining primary camera trapezoidal sections and filling them hardening the mixture with the formation of the artificial pillar, the formation of massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars partial mining stocks edge parts of the massive ore pillar extending up cameras in artificial pillar, holding a boarding production in caving the roof rock, the drilling of her blastholes within the arch of the natural equilibrium of overlapping roof rocks above the massive ore as a whole, complete unloading massive ore pillar forced the collapse of the roof rocks between artificial pillars extending up to the camera, creating backwater artificial pillars collapsed rocks and mining stocks massive ore pillar with maintaining overlapping species of the roof arch natural equilibrium, based on artificial pillars and formed at side surfaces of the artificial pillar in the process of shipment of broken ore retaining slopes, characterized in that the planting production takes place along the axis of symmetry massiveh the ore pillar in contact with the ore Deposit, and blastholes from boarding generate Buryats radially so that the ends of these wells accurately formed to the dimensions and the surface contour of the specified set of natural balance in accordance with the calculated tensile strength of the array of overlapping species.

2. The method according to claim 1, characterized in that the partial mining stocks edge parts of the massive ore pillar extending up cameras at the adjacent artificial pillars are so that these cameras are located on the same stages of testing, form a terraced front of wastewater treatment works.



 

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EFFECT: increased output, improved safety and ecology.

3 cl, 14 dwg

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