CN114352283A - Mining method for mine pillar in panel area through forepoling pressure relief and subsequent filling - Google Patents
Mining method for mine pillar in panel area through forepoling pressure relief and subsequent filling Download PDFInfo
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- 238000005422 blasting Methods 0.000 claims abstract description 48
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- 238000000638 solvent extraction Methods 0.000 claims abstract description 4
- 238000013459 approach Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 12
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
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- E—FIXED CONSTRUCTIONS
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention provides a tray area pillar advanced pressure relief subsequent filling mining method, which comprises the following steps: partitioning: dividing the ore pillar into a plurality of stages in the height direction according to a set height, and dividing each stage into a plurality of ore blocks according to a set size along the trend of the ore pillar; pressure relief: in each stage, the pressure relief blasting is carried out on the ore blocks one by one from the middle position to the two sides, and the pressure relief blasting is carried out on at least one ore block on each side from the first stage to the last stage in advance layer by layer in the next stage; and (3) stoping: respectively mining ores from the middle position to two sides one by one at each stage, wherein the ores with pressure relief blasting at each side are more than the mined ores; filling: and cementing and filling the ore blocks with tailings and cement immediately after the ore is mined. By adopting the method, the pressure relief blasting is performed layer by layer in advance of the next layer, so that the safe and efficient recovery of the ore pillar is realized.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a mining method for advanced pressure relief subsequent filling of ore pillars in a plate area.
Background
With the gradual exhaustion of shallow resources, the large-scale deep well exploitation is gradually increased, and because the deep well exploitation faces the technical problem of high ground stress, for the large-scale deep exploitation of thick ore bodies, the ore pillars of the panel are usually left to support the goaf after the ore room is recovered. And according to rock mechanics calculation, the safety of stoping operation and the stability of shaft and tunnel engineering in the ore pillar are considered, the reserved size of the ore pillar in the panel area is often larger, and if the ore pillar is left, the resource loss amount is larger.
At present, many researches are related to the safe recovery of the ore pillars in the deep-well panel, but the researches are generally only limited to the aspects of changing a mining method, adjusting the recovery parameters and the like, for example, the main ore body is mined by originally adopting a large-diameter or medium-deep hole, and the ore pillars are recovered by adopting a medium-deep hole or shallow hole route method. The management of ground pressure is also generally by means of reinforcing supports. The method has poor safety and low working efficiency, so the recovery of the ore pillars in the panel area is a technical problem of deep well exploitation.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for mining a pillar in a tray area by advanced pressure relief and subsequent filling, which advances the pressure relief blasting layer by layer and realizes safe and efficient pillar recovery.
The invention provides a tray area pillar advanced pressure relief subsequent filling mining method, which comprises the following steps: the method comprises the following steps: partitioning: dividing the ore pillar into a plurality of stages according to a set height in the height direction, and dividing each stage into a plurality of ore blocks according to a set size along the trend of the ore pillar; pressure relief: in each stage, the pressure relief blasting is carried out on the ore blocks one by one from the middle position to the two sides, and the pressure relief blasting is carried out on at least one ore block on each side from the first stage to the last stage in advance layer by layer in the next stage; and (3) stoping: respectively mining ores from the middle position to two sides one by one in each stage, wherein the ores with pressure relief blasting on each side are more than the mined ores; filling: and cementing and filling with tailings and cement immediately after the ore is mined from the ore blocks.
And an access roadway structure is arranged at the bottom of the ore block, each access roadway in the access roadway structure penetrates through the ore pillar along the width direction of the ore pillar, and pressure relief blasting is carried out in the access roadway.
The blast hole structure comprises an upward blast hole structure which is drilled in the access roadway and is arranged in an upward sector mode, a downward blast hole structure which is drilled in a row in the access roadway in the upper stage of the access roadway, and the upward blast hole structure and the downward blast hole structure are arranged on the same vertical plane.
The blast hole structure comprises an advance blast hole structure drilled in the access roadway, a downward blast hole structure arranged in a drilling line is drilled in the access roadway in the stage above the access roadway, and the downward blast hole structure is located above the advance blast hole structure.
And in the ore block, stoping is carried out at intervals on the access roadway, and after the ores are mined, the ores in the rest access roadway are stoped.
The bottom center in stage is provided with along the length direction's of pillar the drift is worn, the drift with the access way tunnel communicates with each other.
The top layer vein-penetrating roadway is arranged above the uppermost layer, top layer access roadways are arranged on two sides of the top layer vein-penetrating roadway, and the top layer access roadway and the access roadways are in the same vertical direction.
And an auxiliary roadway is arranged in the middle of the uppermost stage, auxiliary access roads are arranged on two sides of the auxiliary roadway, and the auxiliary access roads and the access roadway are in the same vertical direction.
The first stage is the uppermost stage of the pillar and the last stage is the lowermost stage of the pillar.
The first stage is the lowermost stage of the pillar and the last stage is the uppermost stage of the pillar.
According to the mining method for mine pillars of the panel area through advanced pressure relief and subsequent filling, the thick and large mine pillars are divided into layers and then divided into blocks, pressure relief blasting is carried out layer by layer from the middle to two sides block by block, the former layer is always advanced and the latter layer is subjected to pressure relief blasting in the blasting process, the pressure relief face of the pressure relief block after pressure relief is mined and filled, and the pressure relief face of the same layer exceeds the mining face. The top of the ore pillar is subjected to top cutting and pressure relief, and the lower part is filled later to form an inverted step-shaped pressure relief structure; or the front layer is subjected to pressure relief blasting from bottom to top and the rear layer is subjected to pressure relief blasting, the bottom of the ore pillar is subjected to pressure relief by an advance cutting groove, and the upper part is filled later to form a step-shaped pressure relief structure. The invention can release pressure, blast, recover and fill layer by layer and block by block, and the pressure release and recovery are cooperated to effectively cooperate, thus avoiding the potential safety hazards such as air shock wave and goaf stability damage caused by large-scale ore caving, effectively reducing the ground stress during formal recovery of ore pillar, reducing the damage of well lane engineering in the ore pillar, avoiding ore dilution caused by collapse of upper and lower tray surrounding rock after recovery of ore pillar, and achieving safe and efficient recovery of ore pillar.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a flow chart of a panel zone pillar advanced pressure relief subsequent filling mining method according to embodiment 1 of the invention;
fig. 2 is a schematic structural view of advanced pressure relief from the top of a pillar according to embodiment 1 of the present invention;
fig. 3 is a plan view of an access roadway structure according to embodiment 1 of the present invention;
fig. 4 is a schematic view of a blast hole structure according to embodiment 1 of the present invention;
fig. 5 is a schematic view of a look-ahead blasthole structure according to embodiment 1 of the present invention;
fig. 6 is a side view of a leading blast hole structure according to embodiment 1 of the present invention;
FIG. 7 is a plan view of a block after filling according to example 1 of the present invention;
fig. 8 is a schematic structural view of advanced pressure relief from the bottom of a pillar according to embodiment 2 of the present invention;
wherein, 1-ore pillar, 2-ore block, 3-drift roadway, 4-upward blast hole structure, 5-downward blast hole structure, 6-drift roadway, 7-top drift roadway, 8-top drift roadway, 9-filler, 10-auxiliary roadway, 11-auxiliary drift, 12-downward blast hole, 13-upward blast hole, 14-middle blast hole, 15-stemming blocking section and 16-explosive.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a panel pillar advanced pressure relief subsequent filling mining method according to embodiment 1 of the present invention, and fig. 2 is a schematic structural diagram of advanced pressure relief from the top of a pillar according to embodiment 1 of the present invention.
As shown in fig. 1 and fig. 2, the method for mining the panels of the mine pillar by advanced pressure relief and subsequent filling can be used for safely recovering the mine pillar in the oversized deep-well panels. The panel ore pillar refers to the thick and big ore body and is used for supporting the panel roof among the large-scale exploitation process, and the guarantee stope structure safety and stability and the ore pillar of setting up of staying generally are the cuboid. In open stope mining, the stope is usually divided into a room and a pillar, and the pillar is recovered after the room is collected. In the recovery process, the ore pillar under the high-stress environment needs to be effectively decompressed, so that the safe and efficient mining of the ore body is ensured. Through repeated simulation test work of stress transfer effects under different pressure relief schemes in the early stage, the method is obtained after comprehensive comparison, after the stress state of the ore column in the panel area is changed through horizontal pressure relief, mining accuracy projects are reasonably arranged by combining a stoping process, and finally, the ore column is recovered safely and efficiently.
The method comprises the following steps:
partitioning: the method comprises the steps of dividing a cuboid ore pillar 1 with large thickness into a plurality of stages according to set height in the height direction, and dividing each stage into a plurality of ore blocks 2 according to set size along the trend of the ore pillar.
The ore pillar 1 defines a plurality of ore blocks 2 with the same size and arranged neatly in the vertical direction and the horizontal direction, and the trend of the ore pillar is the length direction of the ore pillar. The set size comprises a set width, the set height and the set width are respectively the height and the width of the ore block 2, the width of the ore pillar 1 is the length of the ore block 2, and the set height and the set width can be determined according to the specific conditions of the volume, the thickness and the like of the ore pillar.
Pressure relief: and in each stage, the pressure relief blasting is carried out on the ore blocks one by one from the middle position to the two sides, and the pressure relief blasting is carried out on at least one ore block on each side from the first stage to the last stage in advance layer by layer in the next stage.
After the size of the ore block 2 is determined, the pressure relief blasting is started block by block according to the size of the ore block 2. The middle position is the middle part of the length of the ore pillar 1, and the middle position divides the ore pillar 1 into two sides. And (3) firstly carrying out pressure relief blasting on ore blocks in the middle position of each stage, then carrying out pressure relief blasting on the ore blocks one by one on two sides, horizontally transferring the stress, and enabling the ore blocks which are subjected to pressure relief blasting on the two sides to be symmetrical about the middle position. For stability after blasting, the number of blocks blasted per layer is different, each side starting with a first stage, each stage blasting one or two more blocks to relieve pressure than its immediately following stage.
In this embodiment, the pressure is released from the top of the pillar in advance. The first stage is the uppermost stage of the pillar 1 and the last stage is the lowermost stage of the pillar 1. The construction is divided into a first stage, a second stage, a third stage and the like from top to bottom, and the construction is started from the first stage. The ore blocks 2 of each side of the pressure relief blasting in the first stage are one more than those of each side of the second stage, the ore blocks of each side of the pressure relief blasting in the second stage are one more than those of each side of the third stage, and by analogy, the ore blocks with pressure relief form a symmetrical inverted step shape.
And (3) stoping: and respectively mining and transporting ore from the middle position to two sides one by one at each stage, wherein the ore blocks which are subjected to pressure relief blasting at each side are more than the ore blocks from which the ore is transported.
The ore block after pressure relief is subjected to ore recovery, and the pressure relief surface is larger than the recovery surface for the stability of rocks.
The ore blocks at the middle position of each stage are firstly mined and conveyed out, then the ore blocks are mined one by one towards two sides, and the mined ore blocks at the two sides are symmetrical about the middle position. The pressure-relieved ore blocks on each layer cannot be completely mined, a plurality of ore blocks are kept at the end part of each side to be supported by the falling ore, so that an ore buffer layer is formed, and the number of the ore blocks with the ore supports is determined according to the specific construction condition.
Filling: and immediately after the ore blocks are transported out of the ore, the ore blocks are cemented and filled with tailings and cement.
In order to keep the rock stable, the ore blocks which are recovered and transported out of the ore should be immediately filled with tailings and cement to form artificial ore blocks.
Fig. 3 is a plan view of an access roadway structure according to embodiment 1 of the present invention, and as shown in fig. 3, a specific roadway arrangement in an ore pillar 1 may be such that an access roadway structure is provided at the bottom of each lump, the access roadway structure may include a plurality of access roadways 3 each provided along the width direction of the ore pillar and penetrating through the ore pillar, and blast holes are arranged in the access roadways 3 for pressure relief blasting. Each access roadway can be uniformly distributed at the bottom of the ore block, and the distance between the access roadways and the width of the access roadway can be determined according to the actual condition of the ore block.
And a vein penetrating roadway 6 along the length direction of the ore pillars 1 can be arranged at the center of the bottom of each stage, and the vein penetrating roadway 6 is communicated with each access roadway. The drift 6 runs through the length direction of the ore pillar and can be positioned in the center of the width of the ore pillar, namely the drift passes through the middle part of each access roadway and can enter each access roadway through the drift.
Fig. 4 is a schematic view of a blast hole structure according to embodiment 1 of the present invention, and as shown in fig. 4, the blast holes may be arranged such that the blast hole structure is arranged at set intervals in the access roadway 3, the blast hole structure includes an upward blast hole structure 4 drilled in an upward sector arrangement in the access roadway, and the upward blast hole structure includes a plurality of upward blast holes distributed on the side wall and the top of the access roadway. In the stage above the approach roadway, downward blast hole structures 5 arranged in a row are drilled at the bottom of the approach roadway corresponding to the downward blast hole structures, and each downward blast hole structure comprises a plurality of vertical downward blast holes. The upper end of the upward blasthole structure and the lower end of the downward blasthole structure are close to each other in the rock. The upward blast holes are generally shallow holes and the downward blast holes are generally deep holes, and the specific diameter, length, arrangement distance and the like are determined according to the specific construction condition. For example, a shallow upward blast hole structure is arranged in the access roadway in the second stage, a deep downward blast hole structure is arranged at the bottom of the access roadway in the first stage, a bottom ore removal structure is formed after blasting of the downward blast hole structure, and ore after blasting of the downward blast hole structure is discharged through the ore removal structure.
Fig. 5 is a schematic view of a leading blast hole structure according to embodiment 1 of the present invention, and fig. 6 is a side view of the leading blast hole structure according to embodiment 1 of the present invention, and as shown in fig. 5 and 6, in order to form a larger ore removal structure, a leading blast hole structure may be provided in an entry roadway instead of a shallower upward blast hole structure. The advanced blast hole structure comprises an upper blast hole 13 and a lower blast hole 12 which are arranged on two side walls of the access roadway, and a middle blast hole 14 which is arranged in the center of the arched top of the access roadway, wherein five blast holes are drilled on the side walls and the top of the access roadway beyond the middle position of the ore pillar. The included angle between the middle blast hole 14 and the horizontal plane is 15 degrees, the upper blast hole 13 is horizontal, the included angle between the lower blast hole 12 and the horizontal plane is-10 degrees, the depth of each blast hole can be about 8m, the front part of each blast hole is a stemming blocking section 15, and the explosive 16 is filled in the blast hole with the length of about 0.5m from the bottom of the blast hole for initiation. And drilling a downward blast hole structure in an access roadway at the stage above the advanced blast hole structure.
For the stage of the uppermost layer, a downward blast hole cannot be constructed, a top layer pulse tunnel can be arranged above the stage of the uppermost layer, top layer access tunnels are arranged on two sides of the top layer pulse tunnel, and the top layer access tunnels and the access tunnels of the following stages are in the same vertical direction. The size of the top access roadway is the same as that of the access roadway below the top access roadway. And a downward blast hole structure can be constructed at the bottom of the top-layer access roadway at intervals of a set distance. The set distance is determined according to the specific construction situation.
For the stage of the uppermost layer, downward blast holes cannot be constructed, upward blast holes are not enough for blasting ore blocks, an auxiliary roadway 10 can be arranged in the middle of the stage of the uppermost layer, auxiliary access roads 11 are arranged on two sides of the auxiliary roadway 10, and the auxiliary access roads and the access roadways are in the same vertical direction. The auxiliary access way is the same as the access way laneway below the auxiliary access way in size. Upward blast hole structures may be provided at set intervals in the auxiliary approach. Blasting the uppermost ore block in two layers.
The choice of the drill jumbo in this embodiment is dependent on the specific construction situation.
The stoping mode can be that one stope is separated, stoping is carried out in the ore blocks at intervals of the access roadway, and after ore is removed at intervals, the ore collapsed in the rest access roadway is stoped. Can simultaneously recover a plurality of ore blocks, and is safe and efficient.
Fig. 7 is a plan view of a block according to example 1 of the present invention after filling, as shown in fig. 7. The ore pieces immediately after removal are filled with tailings and a cement-bonded filler 9.
The concrete application of this embodiment combines the operating condition of certain iron ore system design at home, and after the orebody adopted the exploitation of major diameter deep hole open stope subsequent filling method in the panel region, leave between the panel region and establish wide 60m, length reaches 600 ~ 800m, highly reaches the pillar of 240 ~ 360m, and the middle section height is 60m, and pillar exploitation is to earth's surface 1400m deep. For thick and large panel pillars, on the basis of the previous work, the method of the embodiment is adopted to recover the pillars.
Depending on the circumstances of the pillar, the size of the nugget is selected, and the set height may be 60m and the set width may be 40 m. Namely, the height of each stage is 60m, the size of the ore block is 60m in height, 40m in width and 60m in length of the ore pillar. The access roadway structure of each ore block is that three access roadways are uniformly arranged in the bottom, and the lateral parts on two sides are respectively provided with one access roadway. The vein-passing laneway passes through the middle part of each route laneway.
The ore pillar is filled from the top in advance after pressure relief, the first stage is set to be the uppermost stage of the ore pillar, and the last stage is set to be the lowermost stage of the ore pillar. The pillar is divided into a first stage, a second stage and a third stage from top to bottom. In each stage, the pressure relief blasting is started by the ore blocks in the middle position, and then the ore blocks on the two sides are blasted respectively. The ore blocks of the pressure relief blasting at each side of the first stage are two ahead than those of the second stage, the ore blocks of the pressure relief blasting at each side of the second stage are two ahead than those of the third stage, and by analogy, the ore blocks with pressure relief form a symmetrical reverse step shape about the middle position.
During blasting, the inside of the access roadway is relieved by adopting an advanced blast hole structure, a downward blast hole structure is drilled at the last stage of the access roadway, and the diameter of the downward blast hole can be
The depth may be 44 to 55 m. A No. 2 rock emulsion explosive and a non-electric conductive detonation system are adopted.
As the upper part of the first stage is not provided with a tunnel, an auxiliary tunnel is added at the middle section of the first stage, auxiliary access ways are arranged at both sides of the auxiliary tunnel, and upward blast hole structures which are arranged in an upward sector shape are drilled in the auxiliary access ways.
And recovering the collapsed ore in each access roadway by adopting a mode of one-by-one mining, and simultaneously recovering 2-3 ore blocks.
3m for ore removal3The scraper carries out retreat mining with two widths of ore pillarsAnd ore removal tunnels are arranged in the panel areas on the sides and are connected with the stoping ore blocks in each access tunnel through connecting channels. Under the condition that the width of the ore pillar is 60m, in the running direction of the ore pillar, the pressure relief surface needs to exceed the mining surface by more than or equal to 120m, namely, the ore blocks mined on each side in each stage are delayed by at least 3 ore blocks subjected to pressure relief. The mined ore blocks are also formed into a symmetrical inverted step shape.
According to the rock exposure condition, the filling can be carried out by taking the access roadway as a unit, and if the rock condition is stable, the filling can be carried out by taking the ore block as a unit.
Example 2
Fig. 8 is a schematic structural view of advanced pressure relief from the bottom of a pillar according to embodiment 2 of the present invention.
As shown in fig. 8, the method for mining the panels and the pillars in the embodiment of the invention adopts the steps of starting from the bottom of the pillars to perform advanced pressure relief and subsequent filling, wherein the first stage can be the lowest stage of the pillars, and the last stage is the uppermost stage of the pillars on the basis of the embodiment 1. The construction method is divided into a first stage, a second stage, a third stage and the like from bottom to top, and the layer-by-layer construction is started from the first stage. The ore blocks of the pressure relief blasting on each side of the first stage are advanced by at least one than the ore blocks of the pressure relief blasting on each side of the second stage, the ore blocks of the pressure relief blasting on each side of the second stage are advanced by at least one than the ore blocks of the pressure relief blasting on each side of the third stage, and so on, the ore blocks with the pressure relief form a symmetrical regular step shape.
The concrete application of this embodiment combines the operating condition of certain iron ore system design at home, and after the orebody adopted the exploitation of major diameter deep hole open stope subsequent filling method in the panel region, leave between the panel region and establish wide 60m, length reaches 600 ~ 800m, highly reaches the pillar of 240 ~ 360m, and the middle section height is 60m, and pillar exploitation is to earth's surface 1400m deep. For thick and large panel pillars, on the basis of the previous work, the method of the embodiment is adopted to recover the pillars.
According to the condition of the ore pillar, the size of the ore block is selected, the set height is 60m, and the set width is 40 m. Namely, the height of each stage is 60m, the size of the ore block is 60m in height, 40m in width and 60m in length of the ore pillar. The access roadway structure of each ore block is that three access roadways are arranged at the bottom, and the lateral parts of two sides are respectively provided with an access roadway. The vein-passing laneway passes through the middle part of each route laneway.
Specifically, the first stage is set as the lowermost stage of the pillar, and the last stage is set as the uppermost stage of the pillar. The ore pillar is divided into a first stage, a second stage and a third stage from bottom to top. In each stage, the pressure relief blasting is started by the ore blocks in the middle position, and then the ore blocks on the two sides are blasted respectively. The ore blocks of the pressure relief blasting at each side of the first stage are one more than the ore blocks of the pressure relief blasting at each side of the second stage, the ore blocks of the pressure relief blasting at each side of the second stage are one more than the ore blocks of the pressure relief blasting at each side of the third stage, and so on, the ore blocks with pressure relief form a symmetrical regular step shape relative to the middle position.
During blasting, the inner side of the access roadway adopts a leading blast hole structure or an upward blast hole structure for pressure relief, the upper stage of the access roadway drills a downward blast hole structure, and the diameter of the downward blast hole can be
The depth may be 44 to 55 m. A No. 2 rock emulsion explosive and a non-electric conductive detonation system are adopted.
A top layer drift roadway 7 can be arranged above the third stage, top layer access roadways 8 are arranged on two sides of the top layer drift roadway, and downward blast hole structures are constructed in the top layer drift roadway. And the downward blast hole structure in the top layer access roadway and the upward blast hole structure in the access roadway of the third stage together blast the ore blocks in the third stage.
And recovering the collapsed ore in each access roadway by adopting a mode of one-by-one mining, and simultaneously recovering 2-3 ore blocks.
3m for ore removal3The scraper carries out retreat mining, ore removal roadways are arranged in the panel areas on two sides of the width of the ore pillar, and the ore removal roadways are connected with the stoping ore blocks in each access roadway through connecting channels. Under the condition that the width of the ore pillar is 60m, in the running direction of the ore pillar, the pressure relief surface needs to exceed the mining surface by more than or equal to 120m, namely, the ore blocks mined on each side in each stage are delayed by at least 3 ore blocks subjected to pressure relief. Of mined materialA symmetrical positive step is formed.
According to the rock exposure condition, the filling can be carried out by taking the access roadway as a unit, and if the rock condition is stable, the filling can be carried out by taking the ore block as a unit.
And the method can also adopt an access type room-column method to yield and relieve pressure for stoping, wherein one ore is mined at intervals in an access roadway of each ore block, ore columns between the access roadways are not mined as yield ore columns, and the ore room after pressure relief is not filled.
The panel pillar advanced pressure relief subsequent filling mining method according to the invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the panel pillar look-ahead pressure relief subsequent filling mining method of the invention described above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. The tray area pillar advanced pressure relief subsequent filling mining method is characterized by comprising the following steps:
partitioning: dividing the ore pillar into a plurality of stages in the height direction according to a set height, and dividing each stage into a plurality of ore blocks according to a set size along the trend of the ore pillar;
pressure relief: in each stage, the pressure relief blasting is carried out on the ore blocks one by one from the middle position to the two sides, and the pressure relief blasting is carried out on at least one ore block on each side from the first stage to the last stage in advance layer by layer in the next stage;
and (3) stoping: respectively mining ores from the middle position to two sides one by one in each stage, wherein the ores with pressure relief blasting on each side are more than the mined ores;
filling: and cementing and filling with tailings and cement immediately after the ore is mined from the ore blocks.
2. The panel pillar advanced pressure relief subsequent filling mining method according to claim 1, wherein an access roadway structure is provided at the bottom of the lump ore, each of the access roadways penetrates the pillar in the width direction of the pillar, and pressure relief blasting is performed in the access roadway.
3. A panel pillar advanced pressure relief subsequent filling mining method according to claim 2, characterized in that blast hole structures are provided at set intervals in the access roadway, the blast hole structures including upward blast hole structures drilled in the access roadway in an upward fan arrangement, and downward blast hole structures drilled in a line arrangement in the access roadway in an upper stage of the access roadway, the upward blast hole structures and the downward blast hole structures being on the same vertical plane.
4. A panel pillar advanced pressure relief subsequent filling mining method according to claim 2, characterized in that blast hole structures are provided in the access roadway at set distances, the blast hole structures including advanced blast hole structures drilled in the access roadway, downward blast hole structures arranged in a row are drilled in the access roadway in an upper stage of the access roadway, the downward blast hole structures being located above the advanced blast hole structures.
5. The advanced pressure relief subsequent filling mining method for panel pillars of claim 2, wherein stoping is performed in said blocks at intervals of the approach roadway, and after ore is mined, ore in the remaining approach roadway is stoped again.
6. The method of advanced pressure relief subsequent filling mining of a panel pillar as defined in claim 2, wherein a tunnel is provided centrally at the bottom of the stage along the length of the pillar, the tunnel communicating with the access tunnel.
7. The advanced pressure relief subsequent filling mining method for panel pillars of claim 6, wherein a top layer vein-penetrating roadway is arranged above the uppermost stage, top layer access roadways are arranged on two sides of the top layer vein-penetrating roadway, and the top layer access roadway and the access roadways are in the same vertical direction.
8. The method for advanced pressure relief subsequent filling mining of a panel ore pillar according to claim 6, wherein an auxiliary roadway is arranged in the middle of the uppermost stage, and auxiliary access roads are arranged on both sides of the auxiliary roadway, and are in the same vertical direction as the access roadway.
9. A panel pillar advanced pressure relief subsequent filling mining method according to claim 1, wherein the first stage is the uppermost stage of the pillar and the last stage is the lowermost stage of the pillar.
10. A panel pillar advanced pressure relief subsequent filling mining method according to claim 1, wherein the first stage is the lowermost stage of the pillar and the last stage is the uppermost stage of the pillar.
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