CN114352283B - Advanced pressure relief subsequent filling mining method for ore pillar in coiled area - Google Patents
Advanced pressure relief subsequent filling mining method for ore pillar in coiled area Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
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- 238000005422 blasting Methods 0.000 claims abstract description 49
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- 239000004568 cement Substances 0.000 claims abstract description 5
- 238000013459 approach Methods 0.000 claims description 21
- 238000011084 recovery Methods 0.000 abstract description 6
- 239000011435 rock Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 6
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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
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Abstract
The invention provides a method for advanced pressure relief subsequent filling and mining of a coiled ore pillar, which comprises the following steps: and (3) blocking: dividing the ore pillar into a plurality of stages in the height direction according to the set height, and dividing each stage into a plurality of ore blocks along the trend of the ore pillar according to the set size; pressure relief: the method comprises the steps that in each stage, ore blocks are subjected to pressure relief blasting from the middle position to two sides one by one, and each side is subjected to pressure relief blasting from the first stage to the last stage one by one before at least one ore block in the subsequent stage; and (3) stoping: ore is extracted from the middle position to two sides one by one in each stage, and more ore blocks are extracted from each side after pressure relief blasting; filling: and immediately after the ore is extracted from the ore blocks, the ore blocks are filled with tailings and cement in a cementing way. By means of the method, the subsequent layer of pressure relief blasting is advanced layer by layer, and safe and efficient ore pillar recovery is achieved.
Description
Technical Field
The invention relates to the technical field of mining, in particular to an advanced pressure relief and subsequent filling mining method for a coiled ore pillar.
Background
With gradual exhaustion of shallow resources, large-scale deep well exploitation is gradually increased, and due to the technical problem that deep well exploitation is faced with high ground stress, aiming at large-scale deep exploitation of thick and large ore bodies, after a ore room is recovered, a coil ore pillar is left to support a goaf. And according to rock mechanics calculation, the safety of stoping operation and the stability of the roadway engineering in the ore pillar are considered, the reserved size of the ore pillar in the coil area is often larger, and if the ore pillar is left, the resource loss amount is larger.
The prior researches on the safety recovery of the ore pillars in the deep well disk area are more, but the prior researches are generally limited to the aspects of changing the mining method, adjusting the extraction parameters and the like, for example, the prior method adopts a main ore body for large-diameter or medium-deep hole mining, and the ore pillars are adjusted to be recovered by adopting a medium-deep hole or shallow Kong Jinlu method. The ground pressure is generally managed by reinforcing the support. The method is poor in safety and low in working efficiency, so that the method aims at the technical problem of deep well exploitation in the recovery of the dish area ore pillar.
Disclosure of Invention
In view of the problems, the invention aims to provide the advanced pressure relief subsequent filling mining method for the coiled ore pillar, which is characterized in that the subsequent layer of pressure relief blasting is advanced layer by layer, so that the safe and efficient ore pillar recovery is realized.
The invention provides a method for advanced pressure relief subsequent filling mining of a coiled ore pillar, which comprises the following steps: the method comprises the following steps: and (3) blocking: dividing the ore pillar into a plurality of stages in the height direction according to the set height, and dividing each stage into a plurality of ore blocks along the trend of the ore pillar according to the set size; pressure relief: the method comprises the steps that in each stage, ore blocks are subjected to pressure relief blasting from the middle position to two sides one by one, and each side is subjected to pressure relief blasting from the first stage to the last stage one by one before at least one ore block in the subsequent stage; and (3) stoping: ore is extracted from the middle position to two sides one by one in each stage, and more ore blocks are extracted from each side after pressure relief blasting; filling: immediately after the ore is mined from the ore block, the ore block is filled with tailings and cement by cementing.
The bottom of the ore block is provided with a drift roadway structure, each drift roadway in the drift roadway structure penetrates through the ore pillar along the width direction of the ore pillar, and pressure relief blasting is carried out in the drift roadway.
And a blasthole structure is arranged in the access roadway at intervals of a set distance, the blasthole structure comprises upward blasthole structures which are drilled in the access roadway and are arranged in a fan shape, downward blasthole structures which are drilled in the access roadway in a row are drilled in the access roadway in the upper stage of the access roadway, and the upward blasthole structures and the downward blasthole structures are on the same vertical plane.
And a blasthole structure is arranged in the access roadway at intervals of a set distance, the blasthole structure comprises an advanced blasthole structure drilled in the access roadway, downward blasthole structures arranged in rows are drilled in the access roadway in the upper stage of the access roadway, and the downward blasthole structures are positioned above the advanced blasthole structures.
And in the ore blocks, stoping is carried out at intervals on the access roadways, and after ore is extracted, the ore in the rest access roadways is stoped.
And a drift roadway along the length direction of the ore pillar is arranged in the center of the bottom of the stage, and the drift roadway is communicated with the access roadway.
A top-layer drift roadway is arranged above the uppermost stage, top-layer drift roadways are arranged on two sides of the top-layer drift roadway, and the top-layer drift roadway and the drift roadway are in the same vertical direction.
An auxiliary roadway is arranged in the middle of the uppermost stage, auxiliary access ways are arranged on two sides of the auxiliary roadway, and the auxiliary access ways 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.
By using the advanced pressure relief subsequent filling mining method for the tray area ore pillars, which is disclosed by the invention, a mode of layering and then blocking thick ore pillars is adopted, the pressure relief blasting is carried out layer by layer from the middle to the two sides block by block, the pressure relief blasting is always carried out on the front layer in advance on the rear layer in the blasting process, the ore blocks after pressure relief are subjected to stoping filling, and the pressure relief surface of the same layer exceeds the stoping surface. The method can be characterized in that the front layer is advanced and the rear layer is subjected to pressure relief blasting from top to bottom, the top of the ore pillar is advanced, the top is cut, the pressure relief lower part is filled later, and an inverted ladder-shaped pressure relief structure is formed; or the front layer is advanced from bottom to top and then the pressure relief blasting is carried out on the front layer, the pressure relief upper part of the advanced grooving at the bottom of the ore pillar is filled later, and a positive-step pressure relief structure is formed. According to the invention, the pressure relief blasting stoping filling is carried out layer by layer in a block manner, the pressure relief and stoping collaborative propulsion are effectively matched, potential safety hazards such as air shock waves and goaf stability damage caused by large-scale ore caving are avoided, the ground stress during the formal stoping of the ore pillar is effectively reduced, the damage of well lane engineering in the ore pillar is reduced, the ore dilution caused by the collapse of surrounding rocks of the upper disc and the lower disc after the ore pillar is recovered is avoided, and the safe and efficient stoping of the ore pillar is achieved.
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. Furthermore, the 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 readily appreciated by reference to the following description and claims in conjunction with the accompanying drawings and a more complete understanding of the invention. In the drawings:
FIG. 1 is a flow chart of an advanced pressure relief subsequent filling mining method for a coiled section pillar according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the structure of the advanced pressure relief from the top of the pillar according to embodiment 1 of the present invention;
fig. 3 is a plan view of an entry roadway structure according to embodiment 1 of the present invention;
FIG. 4 is a schematic view of a blasthole structure according to embodiment 1 of the present invention;
FIG. 5 is a schematic view of a leading borehole structure according to embodiment 1 of the present invention;
FIG. 6 is a side view of a leading borehole structure according to embodiment 1 of the present invention;
FIG. 7 is a plan view of the block according to example 1 of the present invention after filling;
FIG. 8 is a schematic view showing the structure of the present invention according to example 2, wherein the advanced pressure relief is started from the bottom of the pillar;
wherein, 1-ore pillar, 2-ore block, 3-access roadway, 4-up blast hole structure, 5-down blast hole structure, 6-drift roadway, 7-top drift roadway, 8-top access roadway, 9-filler, 10-auxiliary roadway, 11-auxiliary access, 12-down blast hole, 13-up blast hole, 14-middle blast hole, 15-stemming blocking section and 16-explosive.
The same reference numerals will be used throughout the drawings to refer to 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 flow chart of a method for advanced pressure relief and subsequent filling and mining of a pillar in a coil area according to embodiment 1 of the present invention, and fig. 2 is a schematic diagram of a structure for advanced pressure relief from the top of the pillar according to embodiment 1 of the present invention.
As shown in fig. 1 and fig. 2, the advanced pressure relief subsequent filling mining method for the coiled ore pillar provided by the embodiment can be used for safely recovering the coiled ore pillar of the ultra-large deep well. The dish area ore pillar refers to an ore pillar which is used for supporting a dish area roof in the large-scale mining process of thick large ore bodies, ensures the safety and stability of stope structures and is reserved, and is generally cuboid. In open stope mining, the stope is generally divided into a room and a pillar, and the pillar is recovered after the room is collected. In the recovery process, effective pressure relief is necessary to be carried out on the ore pillar under the high-stress environment, so that safe and efficient mining of the ore body is ensured. The repeated simulation test work of the stress transfer effect under different earlier-stage pressure relief schemes is carried out, the method is obtained after comprehensive comparison, and after the stress state of the dish area ore column is changed through horizontal pressure relief, the mining standard engineering is reasonably arranged by combining with the stoping process, so that the safe and efficient ore column recovery is finally achieved.
The method comprises the following steps:
and (3) blocking: the thick and large cuboid ore pillar 1 is divided into a plurality of stages in the height direction according to the set height, and each stage is divided into a plurality of ore blocks 2 along the trend of the ore pillar according to the set size.
The pillar 1 is vertically and transversely divided into a plurality of ore blocks 2 which are orderly arranged and have the same size, and the trend of the pillar is the length direction of the pillar. The set dimensions include a set width, the set height and the set width are the height and the width of the ore block 2, respectively, 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 specific conditions such as the volume, the thickness and the like of the ore pillar.
Pressure relief: and in each stage, carrying out pressure relief blasting on at least one ore block of the subsequent stage layer by layer from the first stage to the last stage.
After sizing the block 2, a block-by-block pressure relief blasting is started in units of the size of the block 2. The middle position is the middle part of the length of the ore pillar 1, and divides the ore pillar 1 into two sides. The ore blocks in the middle position of each stage are subjected to pressure relief blasting firstly, then the ore blocks on two sides are subjected to pressure relief blasting one by one, the stress is horizontally transferred, and the ore blocks in the pressure relief blasting on the two sides are symmetrical about the middle position. For post-blasting stability, the number of blocks per layer blasted varies, each side starting with a first stage, each stage being relieved by blasting one or two more blocks than its immediately following stage.
In this embodiment, the pressure relief is advanced from the top of the pillar. The first stage is the uppermost stage of the pillar 1 and the last stage is the lowermost stage of the pillar 1. The method is divided into a first stage, a second stage, a third stage and the like from top to bottom, and construction is started from the first stage. The ore blocks 2 of each side pressure relief blasting in the first stage are one more than the ore blocks of each side pressure relief blasting in the second stage, the ore blocks of each side pressure relief blasting in the second stage are one more than the ore blocks of each side pressure relief blasting in the third stage, and so on, and the ore blocks with pressure relief form a symmetrical inverted ladder shape.
And (3) stoping: ore is extracted and carried out from the middle position to two sides one by one in each stage, and more ore blocks are carried out from each side after pressure relief blasting.
Ore blocks with pressure relief are subjected to ore extraction, and the pressure relief surface is larger than the extraction surface for rock stabilization.
The ore blocks at the middle position of each stage are firstly extracted and conveyed out, then ore blocks are extracted to two sides one by one, and the ore blocks extracted to the two sides are symmetrical about the middle position. Each layer of the ore blocks subjected to pressure relief cannot be fully extracted, and a plurality of ore blocks are kept at the end parts of each side to form an ore buffer layer, wherein the ore supports are left in the ore blocks, and the number of the ore blocks left with the ore supports depends on the specific condition of construction.
Filling: immediately after ore is transported out of the ore, the ore blocks are filled with tailings and cement in a cementing manner.
In order to maintain the stability of the rock, the ore blocks of the mined ore should be immediately filled with tailings and cement to form artificial ore blocks.
Fig. 3 is a plan view of an entry roadway structure according to embodiment 1 of the present invention, and as shown in fig. 3, a specific roadway arrangement in a pillar 1 may be that an entry roadway structure is provided at the bottom of each block, and the entry roadway structure may include a plurality of entry roadways 3 each provided along the width direction of the pillar and penetrating through the pillar, and blast holes are arranged in the entry roadways 3 to perform 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.
A drift 6 along the length direction of the pillar 1 can be arranged at the center of the bottom of each stage, and the drift 6 is communicated with each drift. The drift 6 penetrates through the length direction of the pillar and can be located in the center of the width of the pillar, namely, the drift penetrates through the middle of each drift and can enter each drift from the drift.
Fig. 4 is a schematic view of a blasthole structure according to embodiment 1 of the present invention, and as shown in fig. 4, blastholes may be arranged such that a blasthole structure is arranged in the approach tunnel 3 at intervals of a set distance, the blasthole structure includes an upward blasthole structure 4 drilled into an upward fan-shaped arrangement in the approach tunnel, and the upward blasthole structure includes a plurality of upward blastholes distributed on a side wall and a top of the approach tunnel. In the stage above the approach tunnel, the bottom of the approach tunnel corresponding thereto is drilled with a downward blasthole structure 5 arranged in rows, the downward blasthole structure comprising several vertical downward blastholes. The upper end of the upward blasthole structure and the lower end of the downward blasthole structure are close in the rock. The upward blast holes are generally shallow holes, the downward blast holes are generally deep holes, the specific diameter and length, the specific arrangement spacing and the like are determined according to the specific conditions of construction. For example, a shallower upward blasthole structure is arranged in the access roadway of the second stage, a deeper downward blasthole structure is arranged at the bottom of the access roadway of the first stage, a bottom ore discharging structure is formed after the downward blasthole structure is blasted, and ore after the downward blasthole structure is blasted is discharged through the ore discharging structure.
Fig. 5 is a schematic view of a leading blasthole structure according to embodiment 1 of the present invention, and fig. 6 is a side view of the leading blasthole structure according to embodiment 1 of the present invention, as shown in fig. 5 and 6, in order to form a larger ore drawing structure, a leading blasthole structure may be provided in an entry roadway instead of a shallower upward blasthole structure. The advanced blast hole structure comprises an upper blast hole 13, a lower blast hole 12 and a middle blast hole 14, wherein the upper blast hole and the lower blast hole are arranged on two side walls of the access roadway, the middle blast hole 14 is arranged in the center of the arched top of the access roadway, and the five blast holes are drilled at the middle positions of the side walls and the top of the access roadway, which are beyond 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 length of about 0.5m from the hole bottom for detonation. And drilling a downward blast hole structure in a road roadway at the upper stage of the advanced blast hole structure.
For the stage of the uppermost layer, downward blast holes cannot be constructed, a top-layer drift roadway can be arranged above the stage of the uppermost layer, top-layer drift roadways are arranged on two sides of the top-layer drift roadway, and the top-layer drift roadway and the drift roadway of the lower stage are in the same vertical direction. The top layer access roadway is the same as the lower access roadway in size. The downward blast hole structure can be constructed at intervals of a set distance at the bottom of the top-layer access roadway. The set distance is determined according to the specific conditions of construction.
For the stage at the uppermost layer, downward blast holes cannot be constructed, upward blast holes are insufficient for blasting ore blocks, an auxiliary roadway 10 can be arranged in the middle of the stage at the uppermost layer, auxiliary routes 11 are arranged on two sides of the auxiliary roadway 10, and the auxiliary routes and the route roadways are in the same vertical direction. The auxiliary route has the same size as the route roadway below the auxiliary route. The upward blast hole structure can be arranged in the auxiliary approach at intervals of a set distance. The uppermost ore block is blasted in two layers.
The choice of the drill jumbo in this embodiment depends on the specific construction situation.
The stoping mode can be one stoping at intervals, stoping is carried out in the ore blocks at intervals of the approach tunnels, and stoping is carried out on ore caving in the rest of the approach tunnels after ore is separated at intervals. Multiple ore blocks can be extracted simultaneously, and the method is safe and efficient.
Fig. 7 is a plan view of the ore block according to embodiment 1 of the present invention after filling, as shown in fig. 7. The ore blocks after ore removal are immediately filled with tailings and cement-bonded filler 9.
The specific application of the embodiment is that, in combination with the actual working condition of the design of a certain domestic iron ore system, after mining by adopting a large-diameter deep hole open-field filling method, ore pillars with the width of 60m, the length of 600-800 m and the height of 240-360 m are reserved between the trays, the middle section height is 60m, and the mining distance of the ore pillars from the ground surface is 1400 m. Aiming at thick and large dish area ore pillars, the ore pillars are recovered by adopting the method of the embodiment on the basis of earlier work.
Depending on the pillar, the size of the block is chosen, the set height may be 60m and the set width may be 40m. I.e. the height of each stage is 60m, the size of the ore block is 60m high, 40m wide and 60m long as the width of the pillar. The structure of the access roadway of each ore block is that three access roadways are uniformly arranged in the bottom, and one access roadway is respectively arranged at the side parts of two sides. The drift roadway passes through the middle part of each drift roadway.
The ore pillar is filled from the top in advance and after pressure relief, the first stage is set as the uppermost stage of the ore pillar, and the last stage is set as the lowermost stage of the ore pillar. The ore pillar is divided into a first stage, a second stage and a third stage from top to bottom. In each stage, the ore blocks at the middle position are subjected to pressure relief blasting, and the ore blocks at the two sides are blasted respectively. The ore blocks of each side pressure relief blasting in the first stage are advanced by two than the ore blocks of each side pressure relief blasting in the second stage, the ore blocks of each side pressure relief blasting in the second stage are advanced by two than the ore blocks of each side pressure relief blasting in the third stage, and so on, and the ore blocks with pressure relief form a symmetrical inverted ladder shape relative to the middle position.
During blasting, the inner side of the drift roadway is relieved by adopting an advanced blast hole structure, the downward blast hole structure is drilled at the last stage of the drift roadway, and the aperture of the downward blast hole can be
The depth may be 44-55 m. And a No. 2 rock emulsion explosive and a non-conductive explosion initiation system are adopted.
Because the upper part of the first stage is free from a roadway, an auxiliary roadway is added at the middle section of the first stage, auxiliary roadways are arranged on two sides of the auxiliary roadway, and an upward blast hole structure which is arranged in an upward fan shape is drilled in the auxiliary roadways.
The caving ore in each access roadway is recovered by adopting a one-by-one mode, and 2-3 ore blocks can be recovered simultaneously.
The ore is discharged by 3m 3 The scraper carries out backward mining, ore drawing tunnels are arranged in the tray areas on two sides of the width of the ore pillar, and the ore drawing tunnels are connected with stopes in each of the access tunnels through connecting channels. In the case of a pillar width of 60m, the pressure relief surface needs to exceed the extraction surface by more than or equal to 120m in the pillar travel direction, i.e. at least 3 ore blocks to be pressure relieved are lagged behind for each side of the ore block extracted in each stage. The mined ore blocks also form a symmetrical inverted step shape.
Filling can be carried out according to the rock disclosure condition by taking a roadway as a unit, and filling can be carried out by taking ore blocks as a unit if the rock condition is stable.
Example 2
Fig. 8 is a schematic view showing the structure of the present invention according to example 2, wherein the pressure relief is advanced from the bottom of the pillar.
As shown in fig. 8, in the method for mining the coiled pillar with advanced pressure relief and subsequent filling provided in this embodiment, on the basis of embodiment 1, advanced pressure relief and subsequent filling is performed from the bottom of the pillar, where the first stage may be the lowest stage of the pillar, and the last stage is the uppermost stage of the pillar. The method is divided into a first stage, a second stage, a third stage and the like from bottom to top, and layer-by-layer construction is started from the first stage. The ore blocks of each side pressure relief blasting of the first stage are advanced by at least one than the ore blocks of each side pressure relief blasting of the second stage, the ore blocks of each side pressure relief blasting of the second stage are advanced by at least one than the ore blocks of each side pressure relief blasting of the third stage, and so on, and the ore blocks with pressure relief form a symmetrical positive ladder shape.
The specific application of the embodiment is that, in combination with the actual working condition of the design of a certain domestic iron ore system, after mining by adopting a large-diameter deep hole open-field filling method, ore pillars with the width of 60m, the length of 600-800 m and the height of 240-360 m are reserved between the trays, the middle section height is 60m, and the mining distance of the ore pillars from the ground surface is 1400 m. Aiming at thick and large dish area ore pillars, the ore pillars are recovered by adopting the method of the embodiment on the basis of earlier work.
According to the situation of the ore pillar, the size of the ore block is selected, the set height is 60m, and the set width is 40m. I.e. the height of each stage is 60m, the size of the ore block is 60m high, 40m wide and 60m long as the width of the pillar. The structure of the access roadway of each ore block is that three access roadways are arranged at the bottom, and the side parts of the two sides are respectively provided with the access roadways. The drift roadway passes through the middle part of each drift roadway.
Specifically, the first stage is set to be the lowermost stage of the pillar, and the last stage is set to be 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 ore blocks at the middle position are subjected to pressure relief blasting, and the ore blocks at the two sides are blasted respectively. The ore blocks of each side pressure relief blasting in the first stage are one more than the ore blocks of each side pressure relief blasting in the second stage, the ore blocks of each side pressure relief blasting in the second stage are one more than the ore blocks of each side pressure relief blasting in the third stage, and so on, the ore blocks with pressure relief are symmetrical and positive steps are formed on the middle position.
During blasting, an advanced blast hole structure or an upward blast hole structure is adopted at the inner side of the drift roadway to relieve pressure, the downward blast hole structure is drilled at the last stage of the drift roadway, and the aperture of the downward blast hole can be
The depth may be 44-55 m. And a No. 2 rock emulsion explosive and a non-conductive explosion initiation system are adopted.
A top-layer drift 7 may be provided above the third stage, with top-layer drift 8 provided on both sides of the top-layer drift, and downward blasthole structures constructed in the top-layer drift. The downward blast hole structure in the top layer approach tunnel and the upward blast hole structure in the third stage approach tunnel together blast the ore blocks in the third stage.
The caving ore in each access roadway is recovered by adopting a one-by-one mode, and 2-3 ore blocks can be recovered simultaneously.
The ore is discharged by 3m 3 The scraper carries out backward mining, ore drawing tunnels are arranged in the tray areas on two sides of the width of the ore pillar, and the ore drawing tunnels are connected with stopes in each of the access tunnels through connecting channels. In the case of a pillar width of 60m, the pressure relief surface needs to exceed the extraction surface by more than or equal to 120m in the pillar travel direction, i.e. at least 3 ore blocks to be pressure relieved are lagged behind for each side of the ore block extracted in each stage. The mined ore blocks also form a symmetrical positive step.
Filling can be carried out according to the rock disclosure condition by taking a roadway as a unit, and filling can be carried out by taking ore blocks as a unit if the rock condition is stable.
The method can also adopt the approach Fang Zhufa yield pressure relief stoping, the approach roadway of each ore block is divided into one mining step, ore pillars between the approach roadways are not mined as yield ore pillars, and the ore room after pressure relief is not filled.
The method for mining a coiled pillar by advanced pressure relief and subsequent filling according to the present 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 above-described method of advanced pressure relief and subsequent filling of a coiled pillar in accordance with the present invention without departing from the teachings of the present invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The advanced pressure relief subsequent filling mining method for the ore pillar in the coil area is characterized by comprising the following steps of:
and (3) blocking: dividing the ore pillar into a plurality of stages in the height direction according to the set height, and dividing each stage into a plurality of ore blocks along the trend of the ore pillar according to the set size;
pressure relief: the method comprises the steps that in each stage, ore blocks are subjected to pressure relief blasting from the middle position to two sides one by one, and each side is subjected to pressure relief blasting from the first stage to the last stage one by one before at least one ore block in the subsequent stage;
and (3) stoping: ore is extracted from the middle position to two sides one by one in each stage, and more ore blocks are extracted from each side after pressure relief blasting;
filling: immediately after the ore is mined from the ore block, the ore block is filled with tailings and cement by cementing.
2. The method of advanced pressure relief subsequent filling mining of a pillar in a tray area according to claim 1, wherein a drift structure is provided at a bottom of the block, each drift in the drift structure penetrates the pillar in a width direction of the pillar, and pressure relief blasting is performed in the drift.
3. The coil pillar advanced pressure relief subsequent filling mining method according to claim 2, wherein blasthole structures are provided in the approach path every set distance, the blasthole structures including upward blasthole structures in an upward fanning arrangement drilled in the approach path, downward blasthole structures in a row arrangement drilled in the approach path in an upper stage of the approach path, the upward blasthole structures being on the same vertical plane as the downward blasthole structures.
4. The coil pillar advanced pressure relief subsequent filling mining method according to claim 2, wherein a blasthole structure is provided in the approach tunnel at every set distance, the blasthole structure including an advanced blasthole structure drilled in the approach tunnel, a downward blasthole structure arranged in a row is drilled in the approach tunnel in an upper stage of the approach tunnel, the downward blasthole structure being located above the advanced blasthole structure.
5. The method of advanced pressure relief subsequent filling mining of a coiled section pillar according to claim 2, wherein in said ore block, stoping is performed at intervals of the access roadway, and after ore is mined, ore in the remaining access roadway is stoped.
6. The method of advanced pressure relief subsequent filling mining of a pillar in a panel of claim 2, wherein a through-pulse tunnel is provided at a bottom center of the stage along a length direction of the pillar, the through-pulse tunnel communicating with the access tunnel.
7. The advanced pressure relief subsequent filling mining method for the pillar in the coil area according to claim 6, wherein a top-layer drift channel is arranged above the uppermost stage, and top-layer drift channels are arranged on both sides of the top-layer drift channel, and the top-layer drift channel and the drift channels are in the same vertical direction.
8. The method of advanced pressure relief subsequent filling mining of a coiled ore pillar according to claim 6, wherein 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 roads are in the same vertical direction.
9. The coil pillar advanced pressure relief subsequent filling mining method according to claim 1, wherein the first stage is an uppermost stage of the pillar and the last stage is a lowermost stage of the pillar.
10. The panel pillar advanced pressure relief subsequent fill mining method of claim 1, wherein the first stage is a lowermost stage of the pillar and the last stage is an uppermost stage of the pillar.
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