CN117722181A - Method and system for mining steep-inclined thick and large ore body protection column - Google Patents
Method and system for mining steep-inclined thick and large ore body protection column Download PDFInfo
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Abstract
The application relates to the technical field of mining and provides a method and a system for mining a steep-inclined thick and large ore body protection column. In the method, the steep thick and large ore body is mined from stage by stage from top to bottom, and each stage of the steep thick and large ore body is divided into a protective ore pillar and a segmented ore body; combining the non-partition areas of the protection ore pillars at the same stage, and performing oblique cutting on the whole, so as to divide the protection ore pillars into a plurality of ore pillar oblique strips; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillar of each stage disc zone is positioned at the boundary of the corresponding segmented ore body and the upper disc surrounding rock, under the premise of ensuring the safe production of underground mines, the protective ore pillar resources are extracted, each stage disc zone is extracted according to the sequence of firstly extracting the protective ore pillar and then extracting the segmented ore body, and the segmented ore body of each stage disc zone is extracted and filled from bottom to top in a segmented manner one by one; realize the high-efficient safe exploitation of the heavy and steep ore body, the multi-resource exploitation improves the economic benefits of mine.
Description
Technical Field
The application relates to the technical field of mining, in particular to a method and a system for mining a steep-inclined thick and large ore body protection column.
Background
The steep thick ore body is a complex ore body shape, the inclination angle is larger than 30 degrees, the thickness is usually more than 50 meters, and the mining difficulty of the ore body is high because the problems of irregular ore body shape, poor stope stability, outstanding safety and the like are faced.
At present, when a large and steep-inclined ore body is mined, when the ore is stable and surrounding rock is unstable, in order to protect the mining of the ore body below the upper-disc unstable surrounding rock, a protective ore pillar with a certain thickness or width is often reserved on the boundary of the ore body, which is close to the upper-disc surrounding rock, so as to prevent the upper-disc surrounding rock from collapsing to influence the mining of the ore body. When the ore value is higher or the ore pillar is thicker, the reserved protection ore pillar not only causes the waste of useful resources, but also can seriously influence the economic benefit of mine production.
Thus, there is a need to provide a solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
It is an object of the present application to provide a method and system for mining steeply dipping thick and large ore body guard posts that solves or alleviates the problems of the prior art described above.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a method for mining a steeply inclined thick and large ore body protection column, which comprises the following steps: mining the steep thick ore body from top to bottom in a stage-by-stage tray area, and dividing each stage tray area of the steep thick ore body into a protective ore pillar and a sectional ore body; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillars of each stage disc area are positioned at the boundary between the corresponding segmented ore body and the upper disc surrounding rock; and mining the sectional ore bodies of each stage of the section from bottom to top in sequence.
Preferably, the width of the protective ore pillar of each stage tray zone is in the range of 8 meters to 12 meters, and the height of the segmented ore body is 10 meters.
Preferably, the non-staged coil areas of the protection ore pillars at the same stage are combined, and the whole is obliquely cut and divided into a plurality of ore pillar oblique strips; the width of each pillar inclined strip is the width of the protection pillar of the corresponding stage disc area, the height range is 8 meters to 10 meters, and the inclination angle range is 8 degrees to 12 degrees.
Preferably, when the protective ore pillar is mined, the sublevel transportation roadway is tunneled from the lower wall surrounding rock of the sublevel ore body at the lowest layer and the lower wall surrounding rock of the sublevel ore body at the uppermost layer of the sublevel ore body of the sublevel ore region at the stage of the protective ore pillar;
tunneling the sectional connecting channel inwards from the sectional transportation roadway to one wing of the corresponding stage disc zone vertical ore body trend; the sectional connecting channel extends from the outer lower pulse disc of the stage disc area to the inner sectional ore body of the stage disc area and is close to the boundary edge of the corresponding sectional ore body and the protective ore pillar;
and tunneling a segmented intra-pulse roadway which penetrates through the whole segmented ore body along the ore body trend.
Preferably, a plurality of pillar diagonal strips are mined and filled at intervals, and then the pillar diagonal strips serving as intervals are mined and filled;
a plurality of road connection short lanes are horizontally tunneled from the subsection intra-pulse roadway at the lowest layer and the uppermost layer to the protection ore pillar; the entrance connecting short lane of the lowermost stage is used for tunneling the inclined strip entrance of the ore pillar obliquely upwards in the inclined strip of the ore pillar and is connected with the entrance connecting short lane of the uppermost stage; the sublevel intra-pulse roadway at the lowest layer and the uppermost layer form a complete transportation and ventilation loop with the horizontal tunneling approach connecting short roadway of the pillar and the inclined strip approach of the pillar.
Preferably, a plurality of pillar diagonal strips are mined at intervals, and then the pillar diagonal strips serving as intervals are mined; when the oblique strip of the ore pillar is mined, the sector blast holes are cut from the oblique approach of the oblique strip of the ore pillar from bottom to top section by section, and the oblique strip of the ore pillar is mined by step blasting from bottom to top;
the blasted ore is shoveled in the inclined approach of the inclined strip of the ore pillar, then is transported downwards from the inclined approach of the inclined strip of the ore pillar, and is transported out of the ground surface directly or through a drop shaft after passing through an approach connecting short lane, a sectional intra-pulse roadway, a sectional connecting lane and a sectional transportation roadway of the lowest layer of the sectional ore body of the stage area where the ore pillar is positioned in turn.
Preferably, after the segmented ore bodies of each stage of the coil are mined, a high-strength filling body with the final strength of more than 4 megapascals is adopted.
Preferably, when mining the pillar diagonal strip to the uppermost layer of segmented ore body, the segmented intra-pulse gallery and the special return air well of the disc area of the previous stage are bridged and connected by a hard air duct;
when the inclined strips of the ore pillars are filled, the filling body reserved roadway technology is adopted to ensure that ventilation can be carried out when the inclined strips of the ore pillars are mined.
The embodiment of the application also provides a system for mining a steep-inclined thick and large ore body protection column, which comprises: the sectional dividing unit is configured to mine the steep thick and large ore body from top to bottom in a stage-by-stage manner, and divide each stage of the steep thick and large ore body into a protective ore pillar and a sectional ore body; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillars of each stage disc area are positioned at the boundary between the corresponding segmented ore body and the upper disc surrounding rock; the mining and filling unit is configured to mine the sectional ore bodies of each stage of the coil area according to the sequence of mining the protective column and then mining the sectional ore bodies, and sequentially mine and fill the sectional ore bodies of each stage of the coil area from bottom to top in a sectional manner; when the protective ore pillar is mined, tunneling a sectional transportation roadway from the lower wall surrounding rock of the sectional ore body at the lowest layer and the lower wall surrounding rock of the sectional ore body at the uppermost layer of the section area of the stage where the protective ore pillar is positioned respectively; tunneling the sectional connecting channel inwards from the sectional transportation roadway to one wing of the corresponding stage disc zone vertical ore body trend; tunneling a segmented intra-pulse roadway penetrating through the whole segmented ore body along the ore body trend; a plurality of road connection short lanes are horizontally tunneled to the protection ore pillar by the subsection intra-pulse roadway of the lowermost subsection ore body and the uppermost subsection ore body respectively;
dividing the steep thick ore body into a plurality of mining stages along the vertical height direction according to preset distances; combining the protected ore pillars at the same mining stage without dividing the ore pillars into disc areas, and performing oblique cutting on the whole to divide the ore pillars into a plurality of ore pillar oblique strips; firstly, carrying out interval mining and filling on a plurality of ore pillar inclined strips, and then, carrying out mining and filling on the ore pillar inclined strips serving as intervals; when the oblique strip of the ore pillar is mined, the sector blast holes are cut from the oblique approach of the oblique strip of the ore pillar from bottom to top section by section, and the oblique strip of the ore pillar is mined by step blasting from bottom to top;
the blasted ore is shoveled in the inclined approach of the inclined strip of the ore pillar, then is transported downwards from the inclined approach of the inclined strip of the ore pillar, and is transported out of the ground surface directly or through a drop shaft after passing through an approach connecting short lane, a sectional intra-pulse roadway, a sectional connecting lane and a sectional transportation roadway of the lowest layer of the sectional ore body of the stage area where the ore pillar is positioned;
the sectional connecting channel extends from the outer lower pulse disc of the stage disc area to the inner sectional ore body of the stage disc area and is close to the boundary edge of the corresponding sectional ore body and the protective ore pillar; the drift connecting short lane of the lowermost segmented ore body is used for tunneling the drift of the inclined strip of the ore pillar obliquely upwards in the inclined strip of the ore pillar and is connected with the drift connecting short lane of the uppermost segmented ore body; the sublevel intra-pulse roadway at the lowest layer and the uppermost layer form a complete transportation and ventilation loop with the horizontal tunneling approach connecting short roadway of the pillar and the inclined strip approach of the pillar.
Advantageous effects
In the method for mining the protection post of the steep-dip thick and large ore body, the steep-dip thick and large ore body is mined from the stage-by-stage tray area from top to bottom, and each stage tray area of the steep-dip thick and large ore body is divided into the protection post and the segmented ore body; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillar of each stage disc area is positioned at the boundary between the corresponding segmented ore body and the upper disc surrounding rock; and mining the sectional ore bodies of each stage of the section from bottom to top in sequence. Under the premise of ensuring the safe production of underground mines, the method can protect the ore pillar resources from being mined, realize the efficient and safe mining of the heavy and steep ore bodies, and improve the economic benefit of the mines by multi-mining resources.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. Wherein:
FIG. 1 is a front view of a staged ore body, and a protective pillar division provided in accordance with some embodiments of the present application;
FIG. 2 is a view A-A of the embodiment of FIG. 1;
FIG. 3 is a C-C view of the embodiment of FIG. 1;
FIG. 4 is a front view of a mining-based cutting operation prior to a formal mining operation provided in accordance with some embodiments of the present application;
FIG. 5 is a view B-B of the embodiment of FIG. 4;
FIG. 6 is a D-D view of the embodiment of FIG. 4;
FIG. 7 is a front view of an operation for mining a pillar diagonal strip during a first mining cycle at a formal mining operation provided in accordance with some embodiments of the present application;
FIG. 8 is an E-E view of the embodiment of FIG. 7;
FIG. 9 is a F-F view of the embodiment of FIG. 7;
FIG. 10 is a front view of a second mining cycle mining pillar diagonal strip and a first mining cycle filling operation during a main mining operation provided in accordance with some embodiments of the present application;
FIG. 11 is a G-G view of the embodiment of FIG. 10;
FIG. 12 is a view H-H of the embodiment of FIG. 10;
FIG. 13 is a front view of a second production cycle after completion of a filling operation provided in accordance with some embodiments of the present application;
FIG. 14 is an I-I view of the embodiment of FIG. 13;
FIG. 15 is a J-J view of the embodiment of FIG. 13;
fig. 16 is a schematic structural view of a system for mining steeply dipping thick and large ore body guard posts provided in accordance with some embodiments of the present application.
Reference numerals illustrate:
1. a stage disc area; 2. segmenting ore bodies; 3. protecting the ore pillar; 4. a pillar diagonal strip; 5. a section transportation roadway; 6. segmenting the contact path; 7. segmenting an intra-pulse gallery; 8. a road junction short lane; 9. a pillar inclined strip enters a road; 10. return air connecting lane; 11. a special return air well; 12. a filler;
1601. a segmentation dividing unit; 1602. and (5) mining the filling unit.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Various examples are provided by way of explanation of the present application and not limitation of the present application. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present application include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
At present, when mining a heavy and steep ore body, the reserved protection ore pillar not only causes a great amount of useful resource waste, but also seriously influences the economic benefit of mine production. Aiming at the situation that the traditional ore is firm and the surrounding rock is unstable and the steep and thick ore body needs to be reserved for protecting the ore pillar to ensure the exploitation safety of most ore bodies, resources are wasted and the economic benefit of mine enterprises is influenced, the application provides a method for exploiting the steep and thick ore body to protect the ore pillar, and under the premise of guaranteeing the safe production of underground mines, the resources of the protecting ore pillar are replaced or mined, so that the overall high-efficiency safe exploitation of the steep and thick ore body is realized, and the economic benefit of the mines is effectively improved by multi-mining resources of the protecting ore pillar.
As shown in fig. 1 to 15, the method for mining the steep and heavy ore body protection specifically comprises mining the steep and heavy ore body from bottom to top in a stage tray zone 1, dividing each stage tray zone 1 into a protection ore pillar 3 and a segmented ore body 2, and mining the protection ore pillar 3 in advance of one stage tray zone 1 of the segmented ore body 2, namely mining the steep and heavy ore body from bottom to top according to the divided stage tray zones 1, and for the stage tray zones 1 adjacent from top to bottom, when mining the segmented ore body 2 of the upper stage tray zone 1, the protection ore pillar 3 of the next stage tray zone 1 is already in mining.
The protective ore pillars 3 of each stage tray zone 1 are positioned at the boundary between the corresponding segmented ore body 2 and the upper tray surrounding rock, the width range of the protective ore pillars 3 of each stage tray zone 1 is 8 meters to 12 meters, and the height of the segmented ore body 2 is 10 meters. In the same stage of the tray area 1, mining is carried out according to the sequence of firstly mining the protection ore pillar 3 and then mining the segmented ore bodies 2, and the segmented ore bodies 2 of each stage of the tray area 1 are mined and filled sequentially from bottom to top in a segmented manner one by one.
In a specific example, dividing the steep-inclined thick ore body into a plurality of mining stages along the vertical height direction according to a preset distance; for example, a steep thick ore body having a vertical height of between about 50 meters and about 230 meters is classified into a mining stage by classifying the ore body having a vertical height of between about 80 meters and about 130 meters. The non-staged coil sections 1 of the protection ore pillars 3 belonging to the same mining stage are combined and then cut obliquely, the non-staged coil sections are divided into a plurality of inclined ore pillar strips 4, the width of each inclined ore pillar strip 4 corresponds to the width of the protection ore pillar 3 of the stage coil section 1, the height range is 8 meters to 10 meters, and the inclination angle range is 8 degrees to 12 degrees.
In the application, as shown in fig. 1 to 6, when the protective ore pillar 3 is mined, the sectional transportation roadway 5 is respectively tunneled from the lower wall surrounding rock of the sectional ore body 2 at the lowest layer and the lower wall surrounding rock of the sectional ore body 2 at the uppermost layer of the stage disc zone 1 where the protective ore pillar 3 is positioned; and the sectional conveying roadway 5 drives the sectional connecting road 6 inwards towards the vertical ore body trend of one wing of the corresponding stage disc zone 1. The sectional connecting channel 6 extends from the outer lower wall of the stage disc area 1 to the inner sectional ore body 2 of the pulse of the stage disc area 1, is close to the boundary edge of the corresponding sectional ore body 2 and the protective ore pillar 3, and then digs a sectional inner drift 7 extending through the whole sectional ore body 2 along the ore body trend. That is, the segmented intra-venous roadway 7 is tunneled along the seam run through the entire segmented seam 2. Wherein, during mining, the inside of the vein refers to the inside of the ore body, the outside of the vein is to the outside of the ore body, the outer lower disc refers to the lower disc outside the ore body, and the intra-vein segmented ore bodies refer to the segmented ore bodies 2 inside the ore body.
In formally mining the protective pillar 3, as shown in fig. 7 to 15, the pillar diagonal stripe 4 is mined in two steps, in a first mining cycle, one pillar diagonal stripe 4 is mined at a time from one pillar diagonal stripe 4 (as shown in fig. 7 to 9), then, in a second mining cycle, the pillar diagonal stripe 4 as a gap in the first mining cycle is mined again, and the pillar diagonal stripe 4 mined in the first mining cycle is filled for a filling operation (as shown in fig. 10 to 12). That is, the plurality of pillar inclined strips 4 are mined at intervals, and then the pillar inclined strips 4 are mined as intervals, and the pillar inclined strips 4 mined in the previous mining cycle are filled; finally, the pillar diagonal strip 4 of the subsequent mining cycle is subjected to a filling operation (as shown in fig. 13 to 15).
In the exploitation process, a plurality of road connection short lanes 8 are respectively tunneled horizontally from the subsection intra-pulse lanes 7 at the lowest layer and the uppermost layer to the protection ore pillar 3. The lowest layer of segmented approach connecting short lanes 8 are used for tunneling the pillar inclined strip approach 9 obliquely upwards in the pillar inclined strip 4 and are connected with the uppermost layer of segmented approach connecting short lanes 8; the sublevel intra-pulse roadway 7 at the lowest layer and the uppermost layer form a complete transportation and ventilation loop with the pillar inclined strip roadway 9 towards the road connecting short roadway 8 for protecting the horizontal tunneling of the pillar 3.
Here, the lower wall surrounding rock of the segmented ore body 2 at the lowest layer of the tray zone 1 at the stage of protecting the ore pillar 3 and the two segmented transportation drifts 5 corresponding to the lower wall surrounding rock of the segmented ore body 2 at the uppermost layer are communicated through the pillar diagonal strip entrance 9, and the segmented intra-pulse drifts 7 and the segmented connecting channels 6 are in transverse and longitudinal lap joint to form a personnel and equipment channel.
When a certain pillar tilt strip 4 is mined, upward sector blast holes are cut from the tilt path of the pillar tilt strip 4 from bottom to top in a section-by-section mode, and the pillar tilt strip 4 is mined by blasting from bottom to top in a step-by-step mode, as shown in fig. 10 to 12. The blasted ore is shoveled in the inclined approach of the pillar inclined strip 4 by shoveling equipment, then transported downwards from the inclined approach of the pillar inclined strip 4, and transported out of the ground surface directly or via a drop shaft after sequentially passing through an approach contact short lane 8, a sectional intra-pulse lane 7, a sectional contact lane 6 and a sectional transportation lane 5 of the lowermost layer section ore body 2 of the stage tray area 1 where the pillar 3 is positioned.
The segmented ore bodies 2 of the coil 1 at each stage are filled after being mined, specifically, the high-strength filling bodies 12 with the final strength of more than 4 megapascals are used for filling. Next, adjacent pillar tilt strips 4 which have not been mined and are isolated are mined next to the pillar tilt strips 4 which have been mined and filled, and filling is performed after mining of the adjacent pillar tilt strips 4 is completed. The cycle is in turn completed to mine and fill the whole pillar 3 of the ore body as shown in fig. 13 to 15.
In the application, when the protective ore pillar 3 is mined, air is fed into the inlet connecting short lane 8 at the bottommost part of the protective ore pillar 3 of the ore pillar at the stage by the segmented transportation roadway 5, the segmented connecting lane 6 and the segmented intra-pulse parallel lane 7 corresponding to the lowermost segmented ore pillar 2 of the ore pillar at the stage of the protective ore pillar 3, and the polluted air after the mining working face is washed enters the inlet connecting short lane 8, the segmented intra-pulse parallel lane 7 and the air return connecting lane 10 corresponding to the uppermost segmented ore pillar 2 of the ore pillar at the stage of the protective ore pillar 3 through the inclined strip of the ore pillar to be discharged to the ground surface.
Here, a large part of the return air connecting short lanes are positioned in the protective ore pillar 3, when the ore pillar inclined strip 4 is mined from bottom to top, peripheral ores of the return air connecting short lanes in the ore body are mined, and therefore the return air connecting short lanes are not damaged temporarily in a short time, when the ore pillar inclined strip 4 is mined to the top ore body, the return air connecting short lanes are temporarily damaged, when the ore pillar inclined strip 4 is mined to the uppermost layer of the sectional ore body 2, the sectional intra-vein parallel lanes 7 of the first-stage tray area 1 and the special return air wells 11 are bridged by a hard air duct, and when the ore pillar inclined strip 4 is filled, a roadway technology is reserved by adopting a filling body 12, so that ventilation can be carried out when the ore pillar inclined strip 4 of the protective ore pillar 3, the return air connecting lanes 10 are ensured to be less influenced by mining and filling, and the ventilation effect when the ore pillar inclined strip 3 and the ore pillar inclined strip 4 are mined is ensured.
By the method for mining the protective ore pillars, the steep-inclined thick and large ore body protective ore pillars 3 are mined, so that the mining rate of mine resources is improved, and the economic benefit of mine enterprises is effectively improved; meanwhile, the high-strength filling body 12 is adopted to carry out exploitation replacement on the protective ore pillar 3 before exploitation of the main part of the ore body in the next stage, namely the segmented ore body 2 in the stage, so that the safety and stability of ore body exploitation are effectively ensured.
In the application, when the protective ore pillar 3 is mined in the next stage, the main part of the ore pillar in advance of the ore pillar in the next stage, namely the segmented ore pillar 2 in the stage is adopted to perform mining replacement of the inclined ore pillar in one-to-one mining, so that the protective ore pillar resources are effectively replaced, and the mine safety production is ensured. The problem of traditional ore is firm and when the thick big ore body of steep slope that surrounding rock is unstable, reserve the extravagant resource of protection pillar is solved, utilize to divide the slant strip with protection pillar 3 to carry out the mode of two-step stoping, realized the safe replacement of protection pillar 3, realized the safe exploitation of mine protection pillar 3, also improved the economic benefits of mine enterprise.
The present embodiments also provide a system for mining a steeply dipping thick massive guard post, as shown in fig. 16, comprising: a segmentation unit 1601 and a production filling unit 1602. The sectional dividing unit 1601 is configured to mine the steep thick and large ore body from top to bottom in a stage-by-stage tray zone 1, and divide each stage tray zone 1 of the steep thick and large ore body into a protective ore pillar 3 and a sectional ore body 2; protecting a pillar 3 from leading a stage disc zone 1 of a segmented ore body 2 for exploitation; the protection ore pillar 3 of each stage disc zone 1 is positioned at the boundary between the corresponding segmented ore body 2 and the upper disc surrounding rock; the mining and filling unit 1602 is configured to mine the sectional ore bodies 2 after the protective columns are mined in the sequence of mining the sectional ore bodies 2 in each stage of the panel 1, and mine and fill the sectional ore bodies 2 of each stage of the panel 1 from bottom to top in sequence one by one; when the protective ore pillar 3 is mined, tunneling the sectional transportation roadway 5 from the lower wall surrounding rock of the sectional ore body 2 at the lowest layer and the lower wall surrounding rock of the sectional ore body 2 at the uppermost layer of the stage disc zone 1 where the protective ore pillar 3 is positioned; a sectional connecting road 6 is tunneled inwards from the sectional transportation roadway 5 to the direction of the vertical ore body of one wing of the corresponding stage disc zone 1; tunneling a segmented intra-pulse roadway 7 which penetrates through the whole segmented ore body along the ore body trend; a plurality of road connection short lanes 8 are horizontally tunneled to the protection ore pillar 3 through the segmented intra-pulse drifts 7 of the lowermost segmented ore body and the uppermost segmented ore body respectively;
dividing the steep thick ore body into a plurality of mining stages along the vertical height direction according to preset distances; combining the non-partition areas of the protection ore pillars 3 in the same mining stage, and performing oblique cutting on the whole to divide the protection ore pillars into a plurality of ore pillar oblique strips 4; firstly, carrying out interval mining on a plurality of ore pillar inclined strips 4, and then mining the ore pillar inclined strips 4 serving as intervals; when the pillar diagonal strip 4 is mined, the upward sector blast holes are cut from the inclined approach of the pillar diagonal strip 4 from bottom to top section by section, and the pillar diagonal strip 4 is mined by blasting from bottom to top step by step;
the blasted ore is shoveled in the inclined approach of the pillar inclined strip 4, then is transported downwards from the inclined approach of the pillar inclined strip 4, and is transported out of the ground surface directly or through a drop shaft after passing through an approach contact short lane 8, a sectional intra-pulse lane 7, a sectional contact lane 6 and a sectional transportation lane 5 of the lowest layer of the sectional ore body of the stage disc zone 1 where the pillar 3 is positioned in sequence;
the segmented connecting channel 6 extends from the outer subplate of the stage disc zone 1 to the inner segmented ore body of the stage disc zone 1 and is close to the boundary edge of the corresponding segmented ore body 2 and the protective ore column 3; the drift connecting short lane 8 of the lowermost segmented ore body is used for tunneling the inclined pillar strip drift 9 obliquely upwards in the inclined pillar strip 4 and is connected with the drift connecting short lane 8 of the uppermost segmented ore body; the lowest and uppermost segmented intra-pulse drifts 7 form a complete transportation and ventilation loop with the horizontal tunneling route of the pillar inclined strip 4 towards the road connecting short drift 8 for protecting the pillar 3.
The system for mining the steep-inclined thick and large ore body protection column provided by the embodiment of the application can realize the steps and the flow of the method for mining the steep-inclined thick and large ore body protection column described in any embodiment, and achieve the same technical effects, and are not described in detail herein.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (6)
1. A method of mining a steeply dipping thick large ore body guard post, comprising:
mining the steep thick ore body from top to bottom in a stage-by-stage tray area, and dividing each stage tray area of the steep thick ore body into a protective ore pillar and a sectional ore body; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillars of each stage disc area are positioned at the boundary between the corresponding segmented ore body and the upper disc surrounding rock;
mining the sectional ore bodies of each stage of the coil area from bottom to top in sequence according to the sequence of mining the protective ore pillar and then mining the sectional ore bodies; when the protective ore pillar is mined, tunneling a sectional transportation roadway from the lower wall surrounding rock of the sectional ore body at the lowest layer and the lower wall surrounding rock of the sectional ore body at the uppermost layer of the section area of the stage where the protective ore pillar is positioned respectively; tunneling the sectional connecting channel inwards from the sectional transportation roadway to one wing of the corresponding stage disc zone vertical ore body trend; tunneling a segmented intra-pulse roadway penetrating through the whole segmented ore body along the ore body trend; a plurality of road connection short lanes are horizontally tunneled to the protection ore pillar by the subsection intra-pulse roadway of the lowermost subsection ore body and the uppermost subsection ore body respectively;
dividing the steep thick ore body into a plurality of mining stages along the vertical height direction according to preset distances; combining the protected ore pillars at the same mining stage without dividing the ore pillars into disc areas, and performing oblique cutting on the whole to divide the ore pillars into a plurality of ore pillar oblique strips; firstly, carrying out interval mining and filling on a plurality of ore pillar inclined strips, and then, carrying out mining and filling on the ore pillar inclined strips serving as intervals; when the oblique strip of the ore pillar is mined, the sector blast holes are cut from the oblique approach of the oblique strip of the ore pillar from bottom to top section by section, and the oblique strip of the ore pillar is mined by step blasting from bottom to top;
the blasted ore is shoveled in the inclined approach of the inclined strip of the ore pillar, then is transported downwards from the inclined approach of the inclined strip of the ore pillar, and is transported out of the ground surface directly or through a drop shaft after passing through an approach connecting short lane, a sectional intra-pulse roadway, a sectional connecting lane and a sectional transportation roadway of the lowest layer of the sectional ore body of the stage area where the ore pillar is positioned;
the sectional connecting channel extends from the outer lower pulse disc of the stage disc area to the inner sectional ore body of the stage disc area and is close to the boundary edge of the corresponding sectional ore body and the protective ore pillar; the drift connecting short lane of the lowermost segmented ore body is used for tunneling the drift of the inclined strip of the ore pillar obliquely upwards in the inclined strip of the ore pillar and is connected with the drift connecting short lane of the uppermost segmented ore body; the sublevel intra-pulse roadway at the lowest layer and the uppermost layer form a complete transportation and ventilation loop with the horizontal tunneling approach connecting short roadway of the pillar and the inclined strip approach of the pillar.
2. The method of mining a steeply dipping thick and large ore body guard post of claim 1,
the width of the protection ore pillar of each stage tray zone ranges from 8 meters to 12 meters, and the height of the segmented ore body is 10 meters.
3. The method of mining a steeply dipping thick and large ore body guard post of claim 1,
the width of each pillar inclined strip is the width of the protection pillar of the corresponding stage disc area, the height range is 8 meters to 10 meters, and the inclination angle range is 8 degrees to 12 degrees.
4. The method of mining a steeply dipping thick and large ore body guard post of claim 1,
after the sectional ore bodies of each stage of the coil are mined, a high-strength filling body with the final strength of more than 4 megapascals is adopted.
5. The method of mining a steeply dipping thick and large ore body guard post of claim 1,
when mining the ore pillar inclined strip to the uppermost layer of segmented ore body, bridging and connecting a segmented intra-pulse gallery of the disc area of the previous stage and a special return air well by a hard air duct;
when the inclined strips of the ore pillars are filled, the filling body reserved roadway technology is adopted to ensure that ventilation can be carried out when the inclined strips of the ore pillars are mined.
6. A system for mining a steeply inclined thick large ore body guard post, comprising:
the sectional dividing unit is configured to mine the steep thick and large ore body from top to bottom in a stage-by-stage manner, and divide each stage of the steep thick and large ore body into a protective ore pillar and a sectional ore body; protecting a stage disc area of the ore pillar advanced sectional ore body for exploitation; the protective ore pillars of each stage disc area are positioned at the boundary between the corresponding segmented ore body and the upper disc surrounding rock;
the mining and filling unit is configured to mine the sectional ore bodies of each stage of the coil area according to the sequence of mining the protective column and then mining the sectional ore bodies, and sequentially mine and fill the sectional ore bodies of each stage of the coil area from bottom to top in a sectional manner; when the protective ore pillar is mined, tunneling a sectional transportation roadway from the lower wall surrounding rock of the sectional ore body at the lowest layer and the lower wall surrounding rock of the sectional ore body at the uppermost layer of the section area of the stage where the protective ore pillar is positioned respectively; tunneling the sectional connecting channel inwards from the sectional transportation roadway to one wing of the corresponding stage disc zone vertical ore body trend; tunneling a segmented intra-pulse roadway penetrating through the whole segmented ore body along the ore body trend; a plurality of road connection short lanes are horizontally tunneled to the protection ore pillar by the subsection intra-pulse roadway of the lowermost subsection ore body and the uppermost subsection ore body respectively;
dividing the steep thick ore body into a plurality of mining stages along the vertical height direction according to preset distances; combining the protected ore pillars at the same mining stage without dividing the ore pillars into disc areas, and performing oblique cutting on the whole to divide the ore pillars into a plurality of ore pillar oblique strips; firstly, carrying out interval mining and filling on a plurality of ore pillar inclined strips, and then, carrying out mining and filling on the ore pillar inclined strips serving as intervals; when the oblique strip of the ore pillar is mined, the sector blast holes are cut from the oblique approach of the oblique strip of the ore pillar from bottom to top section by section, and the oblique strip of the ore pillar is mined by step blasting from bottom to top;
the blasted ore is shoveled in the inclined approach of the inclined strip of the ore pillar, then is transported downwards from the inclined approach of the inclined strip of the ore pillar, and is transported out of the ground surface directly or through a drop shaft after passing through an approach connecting short lane, a sectional intra-pulse roadway, a sectional connecting lane and a sectional transportation roadway of the lowest layer of the sectional ore body of the stage area where the ore pillar is positioned;
the sectional connecting channel extends from the outer lower pulse disc of the stage disc area to the inner sectional ore body of the stage disc area and is close to the boundary edge of the corresponding sectional ore body and the protective ore pillar; the drift connecting short lane of the lowermost segmented ore body is used for tunneling the drift of the inclined strip of the ore pillar obliquely upwards in the inclined strip of the ore pillar and is connected with the drift connecting short lane of the uppermost segmented ore body; the sublevel intra-pulse roadway at the lowest layer and the uppermost layer form a complete transportation and ventilation loop with the horizontal tunneling approach connecting short roadway of the pillar and the inclined strip approach of the pillar.
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