CN117266856B - Inclined medium-thickness ore body double-access subsection open stope mining method - Google Patents
Inclined medium-thickness ore body double-access subsection open stope mining method Download PDFInfo
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- CN117266856B CN117266856B CN202311562919.5A CN202311562919A CN117266856B CN 117266856 B CN117266856 B CN 117266856B CN 202311562919 A CN202311562919 A CN 202311562919A CN 117266856 B CN117266856 B CN 117266856B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005065 mining Methods 0.000 title claims abstract description 33
- 239000011435 rock Substances 0.000 claims abstract description 107
- 238000005553 drilling Methods 0.000 claims abstract description 90
- 238000005520 cutting process Methods 0.000 claims abstract description 57
- 238000005422 blasting Methods 0.000 claims abstract description 14
- 230000005641 tunneling Effects 0.000 claims description 20
- 210000003462 vein Anatomy 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000010878 waste rock Substances 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010790 dilution Methods 0.000 abstract description 2
- 239000012895 dilution Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
Abstract
The invention provides a double-access subsection open stope mining method for an inclined medium-thickness ore body, which is characterized in that an intra-vein rock drilling roadway and an extra-vein rock drilling roadway are tunneled in a stoping subsection to form a double-access stope, ore falling is carried out in a mode of cooperative operation of an upward sector medium-deep hole and a shallow hole, the fallen ore is completely discharged through a split-leakage cutting well, and then the fallen ore is discharged from a stope by utilizing an ore discharge funnel formed by primary blasting of the split-leakage cutting well as a compensation space, so that the fallen ore is efficiently conveyed out of the stope, the depletion rate of the ore is reduced, and safe, efficient and economic stope of the inclined medium-thickness ore body is realized. The inclined medium-thickness ore body double-way segmented open stope mining method has the advantages of simple construction, low labor intensity of workers, no need of entering goaf when workers and equipment only work in a roadway, great improvement of the working safety of the workers, small ore loss rate, low dilution rate, high production efficiency and higher economic benefit.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a double-route segmented open stope mining method for an inclined medium-thickness ore body.
Background
The inclined medium-thickness ore bodies occupy a certain proportion in the metal mines in China, the inclined medium-thickness ore bodies cannot be drawn by gravity due to the fact that the inclined medium-thickness ore bodies are slow in inclination angle, meanwhile, the influence of the thickness of the ore bodies is achieved, stope space is high after stoping, and working safety of personnel and equipment under a high goaf is poor, so that how to safely and efficiently mine the inclined medium-thickness ore bodies is always a technical problem in the field of mine mining.
At present, a common mining method for inclined medium-thickness ore bodies is a room column method, a mountain is tunneled in a stope along the trend of the ore bodies at intervals, layered ore falling is carried out on two sides of the mountain as a free surface, 1/3 of the falling ore is transported out of the stope through a rake after each ore falling, the rest ore is left in the stope as an upper layered ore falling platform, concentrated ore falling is carried out after the whole ore falling of the stope is finished, and roof supporting is carried out in the stope through reserved ore columns. However, the method has low production efficiency, high labor intensity of workers and high ore loss rate, and workers work under the empty areas, so that the safety is poor.
For mines with filling systems, the mining of inclined medium-thickness ore bodies is mainly carried out by adopting an upward horizontal filling method, for example, an invention patent (application number is CN 201910536392.6) discloses a pre-control top efficient mining method for the slowly inclined medium-thickness ore bodies, a strip stope is mined at intervals of two steps, a high-strength cemented filling body is adopted for filling after the mining of one step is completed, the mining of the two steps is carried out, and a low-strength filling body is adopted for filling. The method is used for reducing the exposed area of the stope, and mainly adopts striping for stoping, so that the loss rate of ores can be effectively reduced, but the production efficiency is low, and the filling cost is high; in addition, the method of medium-length hole extraction is adopted, and a lower disc tunneling project is needed, and a large amount of lower disc surrounding rock is mixed into a ore body in the method, so that a large ore depletion rate is caused.
In view of the foregoing, there is a need for an improved inclined medium-thickness ore body double-access segmented open stope method that solves the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a double-access subsection open stope mining method for an inclined medium-thickness ore body, which is characterized in that an intra-vein rock drilling roadway and an extra-vein rock drilling roadway are respectively arranged in a stoping subsection to form a double-access stoping mode, and an ore discharging hopper is arranged at the lower part of the stope, so that caving ore is efficiently conveyed out of a stope, and the technical problems of high ore loss rate or high depletion rate in the process of mining the inclined medium-thickness ore body in the prior art are solved, and the safe, efficient and economic stoping of the inclined medium-thickness ore body is realized.
In order to achieve the aim of the invention, the invention provides a double-route segmented open stope mining method for an inclined medium-thickness ore body, which comprises the following steps:
s1, dividing a ore body to be mined into a plurality of middle-section stopes along an inclined direction, and dividing the middle-section stopes into a plurality of stope sections; the ore body to be mined is mined sequentially from top to bottom by taking the stoping segment as a unit;
s2, tunneling a slope way on the lower disc of an ore body to be mined, tunneling a sectional connecting passage horizontally from the slope way to each stoping section of the ore body to be mined, and tunneling an intra-pulse rock drilling tunnel and an extra-pulse rock drilling tunnel respectively along the trend of the ore body in any sectional connecting passage;
s3, horizontally digging ore entering and exiting through veins in the outer rock drilling tunnel at intervals in a direction away from the ore body to be mined, expanding edges at the end parts of the ore exiting through veins to form a split leakage chamber, and vertically tunneling a split leakage cutting well upwards from the split leakage chamber, wherein the split leakage cutting well is tunneled into an upper extraction section adjacent to the extraction section where the split leakage cutting well is located; the split leakage cutting well is used as an ore outlet channel of the upper stoping section;
s4, penetrating the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel at the other end deviating from the segmented connecting channel to form a cutting tunnel, pulling a bottom in the cutting tunnel to form a bottom pulling space, tunneling a stope cutting well upwards in the bottom pulling space, and pulling a groove by taking the stope cutting well as a free surface to serve as a ore collapse compensation space;
s5, drilling upward sector medium-length holes in the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel, drilling shallow holes in peach-shaped ore pillars between the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel, and performing blasting ore breaking and ore falling by adopting the cooperative operation of the upward sector medium-length holes and the shallow holes, wherein the ore breaking step distance is 3-5 m;
s6, after ore at the upper part of the split leakage cutting well is discharged from the lower part of the split leakage cutting well, the lower opening of the split leakage cutting well is plugged, a fan-shaped medium-length hole is drilled upwards in the split leakage chamber, and an ore discharge funnel is formed through one-time blasting;
s7, after the waste rocks in the ore discharging hopper are discharged completely, ore which cannot be discharged through the split-leakage cutting well in the step S6 is discharged; repeating the steps S5-S7 in a backward stoping mode after ore removal is completed until the whole stoping section is completed;
s8, repeating the steps S3-S7 to perform stoping of all stoping sections from top to bottom until stoping of the whole ore body is completed.
As a further improvement of the invention, in step S2, the intra-pulse rock drilling tunnels and the extra-pulse rock drilling tunnels are uniformly arranged at the junction of the ore body to be mined and the lower wall surrounding rock, the intra-pulse rock drilling tunnels are arranged inside the ore body to be mined, and the extra-pulse rock drilling tunnels are arranged inside the lower wall surrounding rock; the intra-pulse rock drilling roadway and the extra-pulse rock drilling roadway are arranged in the same horizontal plane in parallel.
As a further improvement of the invention, the inclination angle of the inclined medium-thickness ore body to be mined is 30-55 degrees, and the thickness of the ore body is 4-15 m.
As a further improvement of the invention, in step S6, the maximum caliber of the ore removal hopper is not greater than the distance between the inner rock drilling tunnel and the outer wall of the outer rock drilling tunnel; the ore receiving slope angle of the ore discharging funnel is larger than 60 degrees, so that the length of the ore discharging funnel covering one ore breaking is ensured.
As a further improvement of the invention, in step S2, a chute is further provided in the middle stope, the chute is formed by vertically tunneling the sectional connecting passage upwards to an adjacent sectional connecting passage, and the chute is used as a waste rock and ore lowering passage for stoping the sections.
As a further improvement of the invention, in the step S3, the included angle between the ore drawing through vein and the external rock drilling tunnel is 65-75 degrees, and the distance between the ore drawing through vein and the ore drawing through vein is 7-8 m.
As a further improvement of the invention, the ore-drawing through vein is horizontally arranged and is positioned at the same horizontal plane with the sectional connecting channel; the length of the ore-drawing pulse is not less than 7 m.
In step S1, a middle-section along-vein roadway and a middle-section through-vein roadway are further arranged between the middle-section stope and the middle-section stope, the middle-section along-vein roadway is arranged at the junction of the ore body to be mined and the lower wall surrounding rock along the ore body trend, and the middle-section through-vein roadway is a horizontal roadway which is perpendicular to the middle-section along-vein roadway and is tunneled into the ore body to be mined.
As a further improvement of the invention, in step S2, the segmented connecting channel is arranged at one end of the ore body to be mined along the trend of the ore body; the sectional connecting passage is communicated with the ramp and the middle section along vein roadway, or is communicated with the ramp and the extra-vein rock drilling roadway.
As a further improvement of the invention, the ramp is arranged according to the actual working condition of the ore body to be mined, is a channel spiraling in surrounding rock below the ore body to be mined and is used for conveying ores, surrounding rock waste rocks, personnel or material equipment.
As a further improvement of the invention, the distance between the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel is 4-5 m; the specification of the intra-pulse rock drilling tunnel, the extra-pulse rock drilling tunnel and the ore drawing and penetrating pulse is 2-3 m multiplied by 2-3 m.
As a further improvement of the invention, the stope length of the inclined medium-thickness ore body is the length of the ore body to be mined, and the sectional height is 6-9 m.
As a further improvement of the invention, the specifications of the stope cutting well, the split leakage cutting well and the chute are 2m multiplied by 2m, the specifications of the split leakage chamber are 4m multiplied by 3.5m, and the specifications of the bottom pulling space are 10m multiplied by 4m multiplied by 2.6m.
The beneficial effects of the invention are as follows:
1. the invention provides a tilting medium-thickness ore body double-access subsection open stope mining method, which adopts an extrapulse slope way exploitation, adopts a form of double access of an intra-pulse rock drilling tunnel and an extrapulse rock drilling tunnel in a stope, and carries out ore dropping in a form of cooperative operation of an upward sector medium-length hole and a shallow hole, thereby reducing ore loss and improving ore recovery rate; the caving ore is discharged completely through the split-leakage cutting well, and then is discharged by using an ore discharging funnel formed by primary blasting of medium-length holes by taking the split-leakage cutting well as a compensation space, so that the depletion rate of the ore is reduced, and the problems of high ore depletion rate and low grade when the inclined medium-thickness ore body is mined by the existing filling method are solved. The inclined medium-thickness ore body double-way segmented open stope mining method is simple in construction, low in labor intensity of workers, workers and equipment only need to work in a roadway and do not need to enter a goaf, so that the working safety of the workers is greatly improved, medium-length hole blasting ore breaking is mainly adopted for stoping, the production efficiency is high, and the economic benefit is high.
2. According to the invention, by utilizing the cooperation of the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel, the blasting accuracy of ores is improved, and the mixing of surrounding rock waste stones is avoided; the split cutting well and the ore discharging hopper formed by the split cutting well are used for discharging ores twice, so that the ore is separated and discharged, the amount of waste rock mixed into the ore during blasting is reduced, the ore dilution rate is reduced, the ore which is difficult to discharge through the split cutting well is discharged through the ore discharging hopper, the loss rate of the ore is reduced, the mining benefit of the inclined medium-thickness ore body is obviously improved, and the guarantee is provided for the long-term development of mining industry.
Drawings
FIG. 1 is a schematic illustration of the inclined medium-thickness ore body double-access segmented open stope method of the present invention.
FIG. 2 is a schematic view of the direction II-II in FIG. 1.
FIG. 3 is a schematic view of the direction III-III in FIG. 1.
Fig. 4 is a schematic diagram of the blast hole arrangement of the inclined medium-thickness ore body double-route segmented open stope mining method of the present invention.
Reference numerals: 100-middle stope; 111-intra-pulse rock drilling lanes; 112-extravenous rock drilling roadway; 113-ore drawing and pulse penetrating; 114-a split drain chamber; 115-cleaving the leaky cutting well; 116-cutting a roadway; 117-stope cutting well; 118-upward sector medium-length holes; 119-shallow holes; 120-ramp; 130-segmenting the contact; 140-an ore discharge hopper; 150-mine slipping; 160-middle section along vein roadway; 170-middle section drift.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Examples
Referring to fig. 1-4, a method for mining a tilting medium-thickness ore body by double-route subsection open stope includes the following steps:
s1, dividing a ore body to be mined into a plurality of middle-section stopes 100 along an inclined direction, and dividing the middle-section stopes 100 into a plurality of stope sections; the ore body to be mined is mined sequentially from top to bottom by taking the stoping segment as a unit;
s2, tunneling a ramp 120 at the lower disc of the ore body to be mined, tunneling a segmented connecting channel 130 horizontally from the ramp 120 to each stoping segment of the ore body to be mined, and tunneling an intra-pulse rock drilling tunnel 111 and an extra-pulse rock drilling tunnel 112 in any segmented connecting channel 130 along the trend of the ore body;
wherein, the intra-pulse rock drilling tunnel 111 and the extra-pulse rock drilling tunnel 112 are uniformly distributed at the junction of the ore body to be mined and the lower wall surrounding rock, the intra-pulse rock drilling tunnel 111 is arranged in the ore body to be mined, and the extra-pulse rock drilling tunnel 112 is arranged in the lower wall surrounding rock; the intra-pulse rock drilling tunnel 111 and the extra-pulse rock drilling tunnel 112 are arranged in parallel in the same horizontal plane;
s3, horizontally digging ore entering and exiting through veins 113 in the outer rock drilling tunnel 112 at intervals in a direction away from an ore body to be mined, expanding edges at the end parts of the ore exiting through veins 113 to form a split leakage chamber 114, vertically tunneling split leakage cutting wells 115 upwards from the split leakage chamber 114, and tunneling the split leakage cutting wells 115 into an upper extraction section adjacent to the extraction section where the split leakage cutting wells 115 are positioned; the split-leakage cutting well 115 is used as an ore outlet channel of an upper extraction section;
s4, penetrating the intra-pulse rock drilling tunnel 111 and the extra-pulse rock drilling tunnel 112 at the other end away from the segmented connecting channel 130 to form a cutting tunnel 116, pulling the bottom in the cutting tunnel 116 to form a bottom pulling space, tunneling a stope cutting well 117 upwards in the bottom pulling space, and pulling a groove by taking the stope cutting well 117 as a free surface to serve as a ore collapse compensation space;
s5, drilling upward sector medium-deep holes 118 in the intra-pulse rock drilling tunnel 111 and the outer-pulse rock drilling tunnel 112, drilling shallow holes 119 in peach-shaped ore pillars between the intra-pulse rock drilling tunnel 111 and the outer-pulse rock drilling tunnel 112, and performing blasting ore breaking by adopting the cooperative operation of the upward sector medium-deep holes 118 and the shallow holes 119, wherein the ore breaking step distance is 3-5 m as shown in FIG. 4;
s6, after ore at the upper part of the split leakage cutting well 115 is discharged from the lower part of the split leakage cutting well, a lower opening of the split leakage cutting well 115 is plugged, a fan-shaped medium-length hole is drilled upwards in the split leakage chamber 114, and an ore discharge funnel 140 is formed through one-time blasting;
wherein the maximum caliber of the ore drawing hopper 140 is not greater than the distance between the outer walls of the intra-pulse rock drilling tunnel 111 and the outer-pulse rock drilling tunnel 112; the ore receiving slope angle of the ore discharging hopper 140 is larger than 60 degrees so as to ensure that the ore discharging hopper 140 covers the length of one ore breaking, as shown in fig. 3;
s7, after the waste rocks in the ore discharging hopper 140 are discharged completely, ore which cannot be discharged through the split-leakage cutting well 115 in the step S6 is discharged; repeating the steps S5-S7 in a backward stoping mode after ore removal is completed until the whole stoping section is completed;
s8, repeating the steps S3-S7 to perform stoping of all stoping sections from top to bottom until stoping of the whole ore body is completed.
In particular, in the mining method, the matching of the intra-pulse rock drilling tunnel 111 and the extra-pulse rock drilling tunnel 112 is utilized, so that the blasting accuracy of ores is improved, and the mixing of surrounding rock waste rocks is avoided; the split cutting well 115 and the ore discharge hopper 140 formed by the explosion of the split cutting well 115 are adopted for twice ore discharge, so that the separate mining and the separation of ores are realized, the amount of waste rocks mixed into the ores during the explosion is reduced, the ore depletion rate is reduced, the ore which is difficult to discharge through the split cutting well 115 is discharged through the ore discharge hopper 140, the ore loss rate is reduced, the mining benefit of the inclined medium-thickness ore body is obviously improved, and the guarantee is provided for the long-term development of the mining industry.
Specifically, a chute 150 is further disposed in the middle stope 100, the chute 150 is formed by vertically tunneling the sectional connecting channel 130 up to the adjacent sectional connecting channel 130, and the chute 150 is used as a waste rock and ore discharging channel for stoping the sections. It should be noted that, when a certain stoping section is used for ore extraction, an scraper is used to convey ore which is discharged from the split cutting well 115 or the ore-extracting hopper 140 to the section connecting channel 130 through the ore-extracting through vein 113 and the extra-vein rock drilling tunnel 112 of the lower stoping section, and the ore is extracted in a concentrated manner through the ore-extracting well 150, so that the actual ore extraction efficiency is improved.
In step S1, a middle-section along-vein roadway 160 and a middle-section through-vein roadway 170 are further provided between the middle-section stope 100 and the middle-section stope 100, the middle-section along-vein roadway 160 is arranged at the junction of the ore body to be mined and the lower wall surrounding rock along the ore body trend, and the middle-section through-vein roadway 170 is a horizontal roadway which is perpendicular to the middle-section along-vein roadway 160 and is tunneled into the ore body to be mined.
More specifically, in step S3, the included angle between the ore pass 113 and the extravenous rock drilling tunnel 112 is 65 ° to 75 °, and the distance between the ore pass 113 and the ore pass 113 is 7 to 8 m. The ore-drawing vein 113 is horizontally arranged and is positioned on the same horizontal plane with the segmented connecting channel 130; the length of the ore-drawing vein 113 is not less than 7 m. The segmented connecting channel 130 is arranged at one end part of the ore body to be mined along the trend of the ore body, and the cutting roadway 116 is arranged at the other end part; the segmented link 130 communicates the ramp 120 with the mid-section along-vein roadway 160 or communicates the ramp 120 with the extravein rock-drilling roadway 112.
In some specific embodiments, the inclination angle of the inclined medium-thickness ore body to be mined is 30-55 degrees, and the thickness of the ore body is 4-15 m.
When the actual mine inclines to mine the medium-thickness ore body, the ramp 120 is arranged according to the actual working condition of the ore body to be mined, and the ramp 120 is a channel spiraling in surrounding rock below the ore body to be mined and is used for conveying ores, surrounding rock waste rocks, personnel or material equipment.
In some embodiments, the spacing between the intra-pulse rock drilling lanes 111 and the extra-pulse rock drilling lanes 112 is 4-5 m; the specifications of the intra-pulse rock drilling tunnel 111, the extra-pulse rock drilling tunnel 112 and the ore drawing through pulse 113 are 2-3 m×2-3 m.
In some specific embodiments, the stope length of the inclined medium ore body is the length of the ore body to be mined, and the sectional height is 6-9 m.
In some embodiments, the stope cutting well 117, the split drain cutting well 115, and the chute 150 are 2m×2m in size, the split drain chamber 114 is 4m×3.5m in size, and the draw-down space is 10m×4m×2.6m in size.
When an enterprise adopts the inclined medium-thickness ore body double-route segmented open stope mining method of the embodiment to mine the actual mine inclined medium-thickness ore body, the actual recovery rate of the ore is improved by 7% -12% compared with the historical data of the recovery rate by adopting the traditional open stope method, and higher economic benefit is brought to the enterprise.
In summary, the invention provides a double-route section open stope mining method for inclined medium-thickness ore bodies, which is characterized in that an intra-pulse rock drilling roadway and an extra-pulse rock drilling roadway are respectively arranged in a stope section to form a double-route stope mode, so that the accurate blasting range of ores is improved, and the mixing amount of waste rocks is reduced; ore falling is carried out in a mode of cooperative operation of upward sector medium-deep holes and shallow holes, so that ore loss is reduced, and ore recovery rate is improved; the caving ore is discharged through the split leakage cutting well, and then is discharged through an ore discharge hopper formed by primary blasting of medium-length holes by taking the split leakage cutting well as a compensation space, so that the caving ore is efficiently transported out of a stope, the depletion rate of the ore is reduced, the problems of high ore depletion rate and low grade when the inclined medium-thickness ore body is mined by the existing filling method are solved, and the safe, efficient and economic stoping of the inclined medium-thickness ore body is realized. The inclined medium-thickness ore body double-route segmented open stope mining method disclosed by the invention is simple in construction, low in labor intensity of workers, and high in production efficiency and economic benefit, and workers and equipment only need to work in a roadway and do not need to enter a goaf, so that the working safety of the workers is greatly improved.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The double-route segmented open stope mining method for the inclined medium-thickness ore body is characterized by comprising the following steps of:
s1, dividing a ore body to be mined into a plurality of middle-section stopes along an inclined direction, and dividing the middle-section stopes into a plurality of stope sections; the ore body to be mined is mined sequentially from top to bottom by taking the stoping segment as a unit;
s2, tunneling a slope way on the lower disc of an ore body to be mined, tunneling a sectional connecting passage horizontally from the slope way to each stoping section of the ore body to be mined, and tunneling an intra-pulse rock drilling tunnel and an extra-pulse rock drilling tunnel respectively along the trend of the ore body in any sectional connecting passage;
s3, horizontally digging ore entering and exiting through veins in the outer rock drilling tunnel at intervals in a direction away from the ore body to be mined, expanding edges at the end parts of the ore exiting through veins to form a split leakage chamber, and vertically tunneling a split leakage cutting well upwards from the split leakage chamber, wherein the split leakage cutting well is tunneled into an upper extraction section adjacent to the extraction section where the split leakage cutting well is located; the split leakage cutting well is used as an ore outlet channel of the upper stoping section;
s4, penetrating the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel at the other end deviating from the segmented connecting channel to form a cutting tunnel, pulling a bottom in the cutting tunnel to form a bottom pulling space, tunneling a stope cutting well upwards in the bottom pulling space, and pulling a groove by taking the stope cutting well as a free surface to serve as a ore collapse compensation space;
s5, drilling upward sector medium-length holes in the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel, drilling shallow holes in peach-shaped ore pillars between the intra-pulse rock drilling tunnel and the extra-pulse rock drilling tunnel, and performing blasting ore breaking and ore falling by adopting the cooperative operation of the upward sector medium-length holes and the shallow holes, wherein the ore breaking step distance is 3-5 m;
s6, after ore at the upper part of the split leakage cutting well is discharged from the lower part of the split leakage cutting well, the lower opening of the split leakage cutting well is plugged, a fan-shaped medium-length hole is drilled upwards in the split leakage chamber, and an ore discharge funnel is formed through one-time blasting;
s7, after the waste rocks in the ore discharging hopper are discharged completely, ore which cannot be discharged through the split-leakage cutting well in the step S6 is discharged; repeating the steps S5-S7 in a backward stoping mode after ore removal is completed until the whole stoping section is completed;
s8, repeating the steps S3-S7 to perform stoping of all stoping sections from top to bottom until stoping of the whole ore body is completed.
2. The inclined medium-thickness ore body double-access segmented open-stope method according to claim 1, characterized in that in step S2 the intra-pulse rock drilling lanes and the extra-pulse rock drilling lanes are arranged at the junction of the ore body to be mined and a lower disc surrounding rock, the intra-pulse rock drilling lanes are arranged inside the ore body to be mined, and the extra-pulse rock drilling lanes are arranged inside the lower disc surrounding rock; the intra-pulse rock drilling roadway and the extra-pulse rock drilling roadway are arranged in the same horizontal plane in parallel.
3. The inclined medium-thickness ore body double-access segmented open stope mining method according to claim 1, wherein the inclination angle of the inclined medium-thickness ore body to be mined is 30-55 degrees, and the thickness of the ore body is 4-15 m.
4. A tilting medium-thickness ore body double-entry segment open stoping method according to claim 3, characterized in that in step S6 the maximum caliber of the ore drawing hopper is not greater than the distance between the intra-pulse rock drilling tunnel and the outer wall of the extra-pulse rock drilling tunnel; the ore receiving slope angle of the ore discharging funnel is larger than 60 degrees, so that the length of the ore discharging funnel covering one ore breaking is ensured.
5. The inclined medium-thickness ore body double-access segmented open stope method according to claim 1, wherein in step S2, a chute is further provided in the intermediate stope, the chute being formed by the segmented connecting channels tunneling vertically upwards to the adjacent segmented connecting channels, the chute serving as a stope segmented waste rock and ore drop channel.
6. The inclined medium-thickness ore body double-access segmented open stope mining method according to claim 1, wherein in step S3, the included angle between the ore removal through vein and the extra-pulse rock drilling roadway is 65 ° -75 °, and the distance between the ore removal through vein and the ore removal through vein is 7-8 m.
7. The inclined medium-thickness ore body double-access segmented open stope method according to claim 6, wherein the ore drawing through vein is horizontally arranged and is positioned on the same horizontal plane as the segmented connecting channel; the length of the ore-drawing pulse is not less than 7 m.
8. The inclined medium-thickness ore body double-access subsection open stope mining method according to claim 1, wherein in step S1, a middle-section along-vein roadway and a middle-section through-vein roadway are further arranged between the middle-section stope and the middle-section stope, the middle-section along-vein roadway is arranged at the junction of the ore body to be mined and the lower wall surrounding rock along the ore body trend, and the middle-section through-vein roadway is a horizontal roadway which is perpendicular to the middle-section along-vein roadway and is tunneled into the ore body to be mined.
9. The inclined medium-thickness ore body double-access segmented open stope method according to claim 8, characterized in that in step S2 the segmented connecting channel is provided at one end of the ore body to be mined along the ore body; the sectional connecting passage is communicated with the ramp and the middle section along vein roadway, or is communicated with the ramp and the extra-vein rock drilling roadway.
10. The inclined medium-thickness ore body double-access segmented open stope mining method according to claim 2, wherein the distance between the intra-pulse rock drilling roadway and the extra-pulse rock drilling roadway is 4-5 m; the specification of the intra-pulse rock drilling tunnel, the extra-pulse rock drilling tunnel and the ore drawing and penetrating pulse is 2-3 m multiplied by 2-3 m.
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| CN202311562919.5A CN117266856B (en) | 2023-11-22 | 2023-11-22 | Inclined medium-thickness ore body double-access subsection open stope mining method |
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