Method for developing area of flat and slope seam liable to rock-bumps

FIELD: mining.

SUBSTANCE: extracted core of expendable wells helps to define the outline of bed pinching-out at the area, inside the outline the limits of its standard power are registered and on the base of their average position of seam strike the contoured workings are passed. First cuts are located perpendicular to contoured workings upslope or down-dip and till the outline of bed pinching-out and separate the area to paired blocks. Beginning from the end of each paired block and by moving the front line of extraction by reverse movement there are adjacent extraction workings going from the first cuts to both sides with axes shift and parallel to contoured workings; adjacent extraction workings help to extract the bed selectively and are performed with ground and roof breaking, between the paired blocks there remained are solid blocks with width not more than 10% of abutment pressure zone. Each paired block has formed groups of under-goaf and one support solid block. During seam extraction there drilled are prognostic holes and control the degree of rock-bump hazard is performed, if it is revealed the support solid blocks are unloaded.

EFFECT: increase of safety of developing the area of flat and slope seam liable to rock-bumps and reduction of mineral product losses due to involvement of bed pinching-out areas into actual mining.

3 cl, 3 dwg

 

The invention relates to mining, and in particular to technology development tend to geodynamic phenomena flat and inclined bump hazard layers in areas of limited conditional power until the seepage.

There is a method of development of the Starobin Deposit of salts, leaving mezhdurebernyh and block pillar (see Permiakov, R.S., Proskuryakov NM Sudden release of gas and salt. Leningrad, Nedra, 1972, 49-52). In this way a mine field potash mine ventilation and transport drifts are divided into panels and polypanel and polypanel traffic and block the ventilation drifts into blocks. The recess salt blocks are cameras charged to loss mezhdurebernyh pillars, by changing the width of which maintain their smooth deformation and fracture prevention critical pressure on the roof. This method provides control of the roof due to the reduction of stress and pliability of pillars with a gradual decline in the rate of deformation. However, the main disadvantage of this method is the lack of control for limiting the span of the roof at the intensive destruction mezhdurebernyh pillars that rockburst-hazardous reservoir associated with intensive prigruzkoj on mezhdublokovite pillars and their subsequent destruction in geodynamic form.

The known method development p is astou chamber-and-pillar system with holding the camera and leaving mezhdurebernyh pillars (see Shevyakov L.D. Development of mineral deposits, M-L., Whiteheaded, 1953, s.400-402). By this method from drifts spend chambers separated from each other mezhdurebernye whole, which then work backward from the benches, and width are selected on the principle of exclusion of peregruzok from the pressure of the roof based on the weight of the rocks above the dome of the natural equilibrium. The method allows to remove the layer with reversible podvigina faces and to control the roof. However, the disadvantage of this method is the lack of assessment of the roof with the rise of a goaf mining the pillars of the benches. On rockburst-hazardous seam lack of control influence the length of a goaf affects the resulting stress concentration on the core and edge of the reservoir, and removing the pillars of the benches without limitation of the geometric parameters leads to the formation of foci of geodynamic phenomena and their immediate manifestation, therefore, the method for developing bump hazard layers ineffective.

The closest to the technical nature of the claimed method is a method of mining coal seams short faces chamber system with barrier pillars (see Methodological guide geomechanical parameters of the technology is asrabadi coal seams short faces, SPb., Research Institute, 2003, p.6-15)adopted for the prototype, including the sinking of contour cutting and excavation workings, the stability plot columns, define the width of the zone of support pressure and control categories". According to this way to the borders of the mine field drifts are the main directions and from successive strips work panels, which are a group of parallel cells, which partially remove the reservoir. Between the exhaust chambers leave Mezhdunarodnye pillars and support goaf or their group, leaving the part of the panel, or with additional separation barrier pillars, which are periodically alternated with group mezhdurebernyh pillars. The method allows to extract significant coal reserves in conditions where high lava ineffective under the terms of the occurrence of layers associated with reduced lengths as their complex configuration and variability in thickness, geological disturbance.

The disadvantage of this method variant only mezhdurebernyh pillar is the difficulty of determining their optimal number on the site and establish the geometric parameters in cross-section, causing the group to the destruction of large areas of uncontrolled collapse of the roof, wlecome is for a rockburst-hazardous reservoir geodynamic manifestations of rock pressure. In a variant of the leaving group mezhdurebernyh and barrier pillars in uncured, for example, power, or area of occurrence conditions of the reservoir there is no justification for the optimal distance between barrier pillars, and the calculations of the geometric dimensions of pillars, built on the principle of balancing the current load and carrying capacity, in such conditions due to fluctuations in the level of prigruzki have significant errors due to inconsistencies valid geomechanical state and those other pillars.

These disadvantages of the method create provoking uncontrollable destruction of pillars with geodynamic manifestations and subsequent uncontrolled roof caving in already worked the cameras and the cameras, where the extraction of coal. Development of rockburst-hazardous areas of the reservoir with constraints on conditional power with the transition to the pinch because of their irregularity and unevenness in a stronger degree sensitive to the convergence of the roof and soil requirements rationale the functional characteristics of the training blocks and orderly abandonment of pillars reasonable geometrical dimensions, therefore, direct application of variants of this method on the specified rockburst-hazardous areas is inefficient.

The claimed method solves tasks is safe excavation rockburst-hazardous areas of the reservoir, having restrictions on conditional power with the transition to the pinch, where high-performance long treatment the face is unacceptable.

The technical result to be obtained from use of the inventive method, is to improve the safety of mining areas flat and inclined bump hazard layers and reducing the loss of the mineral due to involvement in the clean-out recess plots his thinning.

This technical result is achieved in that in the method of development of the site is sloping and sloping rockburst-hazardous reservoir, including the sinking of contour cutting and excavation workings, the stability plot columns, define the width of the zone of support pressure and control categories", according to the invention, the extracted core exploration wells to determine the path of seepage reservoir on the site, register the inside contour conforming boundaries of his power and their average position along the strike of the formation are contour generation, which is perpendicular to them by rebellion or fall until the circuit between the reservoir are split develop and divide their land for the pair of blocks, then starting from the end of each pair of block and podvigina front notch backward from the slotted openings in the two hundred and the ons offset and parallel to the contour workings are adjacent, separated by pillars mining production, which selectively remove the layer and which are bomb it with soil or roof seam, leave between the paired blocks of the pillars of a width not exceeding 10% of the area of the reference pressure, and each pair block form groups of mojavelinux and one supporting pillar. This pujavaliya pillars leave a width not exceeding 10% of the area of the reference pressure and the reference pillars formed with a width determined from the condition for the sustainability of the deflection of the main roof with a length of not more than 80% of its ultimate passage. Paired blocks of work to the security pillar, which form a width of not less than 50% of the area of the reference pressure and leave along the contour of mine. Simultaneously with removing the layer of extraction openings in the side of the supporting pillars of the Buryat forecast holes and measure the volume of drilling out the little things, which control the degree of", and if it finds it dangerous categories of support pillars to unload non-hazardous categories, for example, by drilling the relief wells.

The method is illustrated by drawings, where figure 1 shows a diagram of the testing site directional and/or inclined rockburst-hazardous reservoir that have restrictions on conditional power with the transition to pinch; figure 2 shows a section transverse to the extension of the reservoir profile is Cerignola working driving the decline and abandonment mojavelinux and reference blocks; figure 3 in the context of the supporting pillar is shown opposite the drilling of its forward-looking holes and discharge holes.

The method is carried out in the following sequence.

In exploration drilling of coal reserves in the reservoir 1 on the extracted core wells define the contour 2 of the seepage layer 1, register inside the loop 2 border 3 conforming his power and by their averaged values along the strike of the reservoir 1 from nearby transportation tunnel 4 are contour generation 5, which is perpendicular to the rebellion (with the path on the opposite side - on crash) and to loop 2 of seepage reservoir 1 are split generation 6 and divide their land for the pair of blocks 7.

Starting from the end of each pair of unit 7, are partial excavation of the reservoir 1 with podvigina front-reverse (figures 1 and 2 arrows), which split from openings 6 in parallel contouring workings 5 are adjacent excavation generation 8. They are in both sides of the slotted openings 6 and offset. Excavation workings 8 layer is extracted selectively, if their height exceeds the capacity of the up-dip of the reservoir 1, and in the roof or ground to expose the rock mass, which is extracted individually with bomb it. Excavation generation 8 pass length to half the width of pair BC the Cove 7, you take from terms in the effective range of schreberiana coal to slotted openings 6. Between the adjacent pair of blocks 7 on the ends of excavation excavations 8 leave the jumper layer in the form of extended pillar 9 of a width not exceeding 10% of the area of the reference pressure, which is determined by nomograms guidance documents in depth the development and capacity of the reservoir 1.

Excavation generation 8 are forming groups of mojavelinux 10 and one reference 11 pillars. Pujavaliya pillars 10, similarly mizubaku, leave a width not exceeding 10% of the area bearing pressure not to implement them with additional unloading activities, and supporting pillars formed with an increased width, which is determined from the condition for the sustainability of the deflection of the main roof with a length of not more than 80% of its ultimate passage, which is installed on the experience of reservoir development on sites of conditioned power or rely on strength, power, and structural weakening of the roof. The pair of blocks 7 to develop the security pillar 12, which are left along the contour openings 5 in accordance with the instructions and recommendations of the sustainable maintenance of stationary preparatory and major roadways. When this security pillars 12 is formed of a width not less than 50% of the area of the reference pressure.

In terms of the s the " mined seam 1 together with its partial extraction of the extraction openings 8 in the side of the supporting pillars 11 are drilling forecast holes 13 and measure the volume of drilling out the little things during drilling, by which to determine the amount of the". When it detects dangerous for the category of supporting pillars, for example, razvarivat counter unloading wells 14 by overlapping their ends and spacing provide non-hazardous category.

Development of the site is sloping and sloping bump hazard layer of the claimed method allows for safe excavation in places that have restrictions on conditional power with the transition to pinch, and engage in treatment works parts of a mine field, charged with the work of the high lava geological conditions of occurrence of loss. Site preparation of a mine field, including the sinking of contouring, cutting and excavation workings with the formation of paired blocks, provides within the mine fields everywhere removing the layer with the limitations of standard output.

The width of the pillar between the paired blocks and between adjacent excavation workings, limited to 10% of the area of the reference pressure, is a condition of the acquisition of such pillars give up to a quiet smooth fracture after excavation of reservoir fluctuations rock pressure. At the same time, the width of the supporting pillars, calculated from the stability condition of the main roof with a length of not more than 80% of the limit of the span of the roof, maintains safe supports the neigh excavation excavations during the extraction of the reservoir, and forecast and unloading drilling support pillars eliminates the formation of a foci of geodynamic phenomena. Doing work paired blocks perpendicular to the contour workings and offset axes adjacent to probloem and blocks excavation excavations to be undertaken in parallel contouring creates a uniform load distribution over the area of the development taking into account the maximum span of the roof and peregruzok on the support and pujavaliya pillars. Security pillars with a width of not less than 50% of the area bearing pressure along the contour openings allow you to maintain uninterrupted transportation of coal from the site of the development and to protect it from the impact of mining operations on the adjoining sections of a mine field.

This embodiment of the method expands the boundaries of the extraction bump hazard layers conforming with the geological constraints while ensuring safe operation of sewage treatment works prevention of geodynamic phenomena and maintain the stability of tunnels. Compared with the prototype, keeping intervals between groups of mojavelinux and supporting pillars linked with the utmost span of the roof, the forecast and the discharge control them in the category of " systematic and geometric preparation of sections of a mine field when geomechanical reasonable size and have access to the exact bearing capacity of the supporting pillars with give mojavelinux provide exception of the formation of the " with its implementation in the form geodinamicheskih phenomena and caused uncontrolled caving the roof on the plot development.

1. Method development of the site is sloping and sloping rockburst-hazardous reservoir, including the sinking of contour cutting and excavation workings, the stability plot columns, define the width of the zone of support pressure and control categories", characterized in that the extracted core exploration wells to determine the path of seepage reservoir on the site, register the inside contour conforming boundaries of his power and their average position along the strike of the formation are contour generation, which is perpendicular to them by rebellion or fall until the circuit between the reservoir are split develop and divide their land for the pair of blocks, then, starting from the end of each block pair and podvigina front notch backward from the slotted openings in both sides of the offset and parallel to the contour workings are separated by adjacent pillars mining production, which selectively remove the layer and which are bomb it with soil or roof seam, leave between the paired blocks of the pillars of a width not exceeding 10% of the area of the reference pressure, in each pair block form groups of mojavelinux and one supporting pillar, while supporting pillars formed with a width determined from the conditions the sustainability of the deflection of the main roof with a length of not more than 80% of its ultimate passage, paired blocks of work to the security pillar, which leaves along the contour of the workings, simultaneously with removing the layer of extraction openings in the side of the supporting pillars of the Buryat forecast holes and measure the volume of drilling out the little things, which control the degree of", and if it finds it dangerous categories of support pillars to unload non-hazardous categories, for example, by drilling the relief wells.

2. The method according to claim 1, characterized in that pujavaliya pillars leave a width not exceeding 10% of the area of the reference pressure.

3. The method according to claim 1, characterized in that the protective pillars form of a width not less than 50% of the area of the reference pressure.



 

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