CN114000881A - Non-pillar sublevel caving method mining method under large-area cemented filling body - Google Patents
Non-pillar sublevel caving method mining method under large-area cemented filling body Download PDFInfo
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Abstract
The invention discloses a sublevel caving method mining method without a sill pillar under a large-area cemented filling body, which comprises the following steps: 1) the method comprises the steps of 1), selecting stope layout and structural parameters, setting 4 subsections with the subsection height of 15m, 3) carrying out stoping operation, wherein the stoping operation is carried out sequentially from the upper subsection to the lower subsection in space, the stope is withdrawn from the upper tray to the lower tray in each subsection and is gradually stoped from the east end to the west end of an ore body, 4) ventilating the stope, enabling fresh air flow required by the stope to enter each subsection roadway from the middle section through an air inlet raise shaft, a mining aligning slope way and a measure slope way, and introducing the fresh air flow into ore removal, rock drilling, explosive loading, supporting and tunneling working faces by using a local fan, and 5) carrying out stope supporting. The invention can solve the problem of mining ore bodies under the large-area and high-strength cemented filling body at present.
Description
Technical Field
The invention relates to the technical field of mining methods under cemented fillers, in particular to a non-pillar sublevel caving method mining method under a large-area cemented filler.
Background
The original two-mining-area of Longshou ore Xi adopts a downward layered hexagonal route mechanical cementing filling method for stoping, two stoping middle sections of 1554m and 1430m are arranged in the mining area, and double-middle-section simultaneous stoping is carried out. The middle section of 1554m is recovered to a 1610m section, and a cemented filling layer of about 27.3m is formed between 1614.7 m and 1642 m; the 1430m middle section has been stoped to 1494m section 16 layering, and a cemented filling layer of about 42.5m is formed between 1503.5-1546 m. In 2016, 3 months, the intermediate section of 1554m is temporarily stopped due to the action influence of the ore control fault F8 in the mining area. At present, the 1430m middle section is normally produced by adopting a filling method.
In 2016, a large area of the cemented filling body collapses unexpectedly in a range of 1610m horizontal 5-7 rows in the middle section of the upper part of a second mining area in 3 months and west and penetrates to the ground surface to form a large ground surface collapse area, so that the cement filling mining in the middle section of 1554m in the upper mining field completely stops production in the Longji ore second mining area, and the mining area is subjected to the mining by adopting a downward layering hexagonal access mechanical cemented filling method, wherein two mining middle sections of 1554m and 1430m are arranged, and the simultaneous mining of double middle sections is realized. The middle section of 1554m is recovered to a 1610m section, and a cemented filling layer of about 27.3m is formed between 1614.7 m and 1642 m; the 1430m middle section has been stoped to 1494m section 16 layering, and a cemented filling layer of about 42.5m is formed between 1503.5-1546 m. In 2016, 3 months, the intermediate section of 1554m is temporarily stopped due to the action influence of the ore control fault F8 in the mining area. At present, the 1430m middle section is normally produced by adopting a filling method.
In 2016, the middle section of 1610m in the middle of 3-month-west mining area of the upper part and the horizontal range of 5-7 rows unexpectedly collapses in a large area and penetrates to the ground surface to form a large ground surface collapse area, so that the cement filling mining of the middle section of 1554m in the upper mining area is completely stopped. Therefore, there is an urgent need for a method that can mine under large area, high strength cemented packs.
Disclosure of Invention
Aiming at the technical problems, the invention provides a sill pillar-free sublevel caving method mining method under a large-area cemented filling body, which can solve the problem of mining ore bodies under the existing large-area and high-strength cemented filling body under the large-area and high-strength cemented filling body.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a sublevel caving method mining method without a sill pillar under a large-area cemented filling body comprises the following steps:
1) stope layout and structural parameter selection
The height of each segment is 15m, 4 segments are arranged, and the segments are 1595m, 1580m, 1565m and 1546m from top to bottom respectively;
2) mining accurate cutting
Arranging a subsection roadway, an ore chute, an air inlet patio and an air return patio on the lower tray of an ore body, arranging the subsection roadway along the vein, arranging an ore removal approach perpendicular to the trend of the ore body, spacing 15m along the trend of the ore body, tunneling a cutting gallery on the boundary of the upper tray of the ore body and perpendicular to the ore removal approach, communicating adjacent subsection roadways through a mining preparation slope way, drilling wedge-shaped rock drilling blast holes in the cutting gallery, and blasting the cutting gallery as a free surface to form a cutting groove;
3) recovery operations
The stoping sequence is mined from an upper section to a lower section in space, the mining is carried out from the upper disc to the lower disc in each section, the ore body is stoped from the east end to the west end gradually, upward sector-shaped rock drilling blast holes are drilled in an ore removal route, each row of 1595m section has 10-11 blast holes, the longest blast hole depth is 14.3m, the total length of one row face blast hole is 118m-126m, the diameter of the blast hole is 80mm, the row spacing of the blast holes is 2.2m, 1580m section and 1565m section are provided, each row has 11-12 blast holes, the longest blast hole depth is 17.0m, the total length of one row face blast hole is 146m-155m, 1546m section is provided, each row has 11-12 blast holes, the longest blast hole depth is 21.8m, and the total length of one row face blast hole is 150m-168m;
4) stope ventilation
Fresh air flow required by a stope enters each subsection roadway from the middle section through an air inlet raise 23, a mining accurate slope ramp 8 and a measure slope ramp, and the fresh air flow is introduced into a working face by a local fan, such as ore removal, rock drilling, charging, supporting and tunneling;
5) stope support
The roadway is supported by a single-layer shotcrete net, the thickness of the shotcrete is 100mm, the metal net is made of round steel with the diameter of 6.5mm, the net depth is 150mm multiplied by 150mm, the length of an anchor rod is 2.25m, the diameter is 18mm, the row spacing is 1.0m multiplied by 1.0m, the double-layer shotcrete net is adopted for supporting in a section with poor ore rock, the supporting is divided into two times, and the supporting parameters in each time are consistent with the supporting of the single-layer shotcrete net.
Wherein in the step 2), the diameter of the ore pass is phi 3.5 m.
In the step 2), the width multiplied by the height of the net section size of the cutting roadway is 4.6m multiplied by 4.3 m.
The invention has the beneficial effects that: the invention fully utilizes the existing development, accurate mining, ventilation, drainage and other projects of the original upper middle section filling method, realizes the efficient, smooth and seamless connection of the filling method and the caving method, and effectively utilizes all development and mining and cutting projects (including various chambers) of the original cemented filling method, thereby leading a caving method stope to be put into production at the fastest speed and saving huge economic cost and time cost.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a sectional view B-B of fig. 1.
Fig. 3 is a cross-sectional view C-C of fig. 1.
Wherein, 1, drilling a blast hole; 2. ore removal and access; 3.1554 middle section upper filling body; 4.1554 middle lower part filling body; 5. cutting a drift; 6. segmenting a roadway; 7. a communication channel; 8. segmenting the roadway by a filling method; 9. ore pass; 10. a return air raise; 11. ore caving; 12.1595 m segments; 13.1580 m segments; 14.1565 m segments; 15.1546 m are segmented.
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 further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
Large-area caving of 5-7 rows of cemented filling bodies and overlying rocks in the western second mining area enables the construction pressure of the mine to be further released outside the two fracture layers, and extremely favorable conditions are created for caving mining and support of a stope roadway. The sublevel caving method without the sill pillar has the particularity in the aspects of mining methods, structural parameters and stoping processes, so that the caving and covering layer forming and the stoping process of the sublevel caving method without the sill pillar on the upper part of an ore body are highly uniform, additional projects are not required to be arranged, and the sublevel caving method without the sill pillar can be realized only by carrying out necessary plans on stoping positions, sequences and advancing speeds. It is for this reason that the transition from cemented filling to sill pillar free sublevel caving is also relatively simple and straightforward. The original main exploitation, lifting transportation, ventilation system and main mining preparation engineering of the cemented filling method are basically fully utilized. As the formation process of the overburden is completed, the transition between the two mining methods will be substantially complete.
(1) Stope layout and structural parameter selection
The segment height is 15m, and 4 segments are arranged, namely a 1595m segment 12, a 1580m segment 13, a 1565m segment 14 and a 1546m segment 15 from top to bottom. Due to the mine's requirement for ore production, the 9-line exploration line restored downward path cemented filling mining to the 1600m level in the west range in 2019. Therefore, according to the current state of mine production, the breakout height of the 1580m segment 9 line is 20m, the breakout height of the 1595m segment 12 line is 20m, the breakout height of the east segment 9 line of the 1580m segment is 15m, the breakout height of the 1565m segment 14 line of the 1586 m segment is 19 m. The route distance and the ore caving step distance are respectively 15m and 2.2 m.
(2) Mining accurate cutting
The mining preparation project mainly comprises a sectional roadway 6, a mineral removal approach 2, an air return raise 10, a cutting drift 5, a connecting road 7 and an ore pass 9.
The subsection roadway 6, the ore pass 9, the air inlet raise and the air return raise 10 are all arranged on the lower tray of the ore body, and the diameter of the ore pass 9 is phi 3.5 m. The sectional roadway 6 is arranged along the vein, the ore removal access road 2 is arranged perpendicular to the trend of the ore body, and the interval is 15m along the trend of the ore body. And (5) tunneling and cutting drifts 5 on the boundary of the ore body and the vertical ore removal route. The sectional roadways 6 are communicated through a mining slope ramp.
The wedge-shaped rock drilling blast hole 1 is drilled in the cutting drift 5, the cutting drift 5 is used as a free surface for blasting to form a cutting groove, and in order to ensure the free surface compensation space when the wedge-shaped blast hole is grooved, the net section size of the cutting drift 5 is 4.6m multiplied by 4.3m (width multiplied by height). When the groove is broached, firstly, a wedge-shaped space is formed on a top plate of a cutting roadway in a shallow hole blasting mode in the cutting roadway, then 6 rows of approximately symmetrical inclined blast holes are respectively arranged on two sides, a first blasting area of the cutting groove is formed in a micro-difference blasting mode, and then the two sides are continuously blasted to form the groove by adopting a fan-shaped hole row surface vertical to the cutting groove roadway. Each row of cutting blast holes has 4 blast holes, the total length of the blast holes is 22m, the diameter of the blast holes is phi 80mm, and the row spacing is 1.4 m.
(3) Recovery operations
The stoping sequence is mined from the upper subsection to the lower subsection in space, and in each subsection, stoping is carried out from the upper tray to the lower tray, and stoping is carried out from the east end to the west end of the ore body gradually and sequentially.
The drilling adopts a Simba1254 type medium-length hole drilling jumbo to drill upward sector-shaped drilling blast holes 1 in a mine removal access 2, the total number of 10 blast holes in each row of a first mining section is 14.3m, the longest blast hole depth is 14.3m, the total length of blast holes on one row surface is 118m, the diameter of the blast holes is phi 80mm, and the row spacing of the blast holes is 2.2 m. 1580m section 13 and 1565m section 14, each row has 11 blast holes, the longest blast hole depth is 17.0m, and the total length of the blast holes of one row surface is 146 m. 1546m, each row has 11 blast holes, the longest blast hole depth is 21.8m, and the total length of the blast holes on one row is 150 m. The rock drilling blast hole 1 is filled with granular ammonium nitrate fuel oil explosive by adopting a charging trolley, and a non-electric explosion system is detonated. The exploded ore 11 is removed from the end part of the ore removal route 2 by adopting the existing JCCY-6 diesel carry scraper of the mine, each carry scraper is responsible for ore removal operation of 6 effective routes, and the ore removal capacity of the carry scraper is 38 multiplied by 104t/a according to the average ore removal distance. The ores shoveled out from the stope are conveyed to each subsection ore pass 9 and are lowered to 1430m middle section rail transportation vein channels and rail transportation vein-crossing channels through the pass.
1595m initial mining test segment mainly forms a covering layer and creates good conditions for the mining of the lower segment by a sublevel caving method without a sill pillar. Therefore, ore drawing is carried out in a total amount control ore drawing mode, the ore drawing amount of the step pitch is 30% of the ore caving amount of the step pitch according to the current test production situation, and the rest ore amount is extracted in subsequent subsections.
The 1580m subsection 13 also adopts an ore drawing mode of 'total amount control ore drawing' to control ore drawing, the ore drawing amount of the step pitch is 80% of the ore drawing amount of the step pitch caving, the upper filling body 3 of the middle section of 1554 can be ensured to be completely, fully and safely caving, and a waste rock covering layer required by the sill pillar-free subsection caving method mining is formed. The 1565m section 14 is drawn when the overburden has been formed and can be controlled in a "low dilution draw" mode to recover ore efficiently and adequately within acceptable levels of ore dilution. 1546m section 15 is the last section, and research is considered to use "cut-off grade ore drawing" to recover the ore as much as possible.
Because the elevation of the top plate of the initial stoping route of the 1430m middle section is 1546m, the stoping route bottom plate of the 1546m section 15 of the bottom-pillar-free sublevel caving method is directly positioned above the filler 4 at the lower part of the 1554 middle section according to the designed segmental division. In order to ensure the safety of the last sublevel stoping access, the mining access is probed in advance (drilling, tunneling and the like can be realized), if a gap or a hole which influences the arrangement of a stoping roadway and normal production does not exist between the 1554 middle-section upper filling body 3 and the 1554 middle-section lower filling body 4, the stoping access can be normally tunneled for stoping. If more holes exist in the middle section lower filling body 4 of 1554, certain technical measures (such as pouring cemented filling materials and the like) are adopted for processing, and when the lower filling body can meet the normal production requirement of the upper section, a mining stoping route is tunneled to prepare for the mining work of the 1546m section 14.
(4) Stope ventilation
Fresh air flow required by a stope enters each subsection roadway from the middle section through an air return raise 10, a mining accurate slope ramp 8 and a measure slope ramp, and is introduced into working faces such as ore removal, rock drilling, charging, supporting, tunneling and the like by a local fan.
(5) Stope support
Most of the roadways formed in the current western second mining area are supported by a single-layer shotcrete net, and the thickness of the shotcrete is 100 mm; the metal net is made of round steel with the diameter of 6.5mm, and the mesh degree is 150mm multiplied by 150 mm; the anchor rods are 2.25m long, 18mm in diameter and 1.0m x 1.0m in row spacing. And (3) adopting double-layer shotcrete-anchor net support in a section with slightly poor ore rock, and carrying out support twice, wherein the support parameters of each time are the same as those of single shotcrete-anchor net support.
The stoping access is mainly used for rock drilling, blasting and ore removal during production by a sill pillar-free sublevel caving method, and the existing time is short, so that the adopted supporting mode is single-layer shotcrete-anchor net supporting.
Example 2
Large-area caving of 5-7 rows of cemented filling bodies and overlying rocks in the western second mining area enables the construction pressure of the mine to be further released outside the two fracture layers, and extremely favorable conditions are created for caving mining and support of a stope roadway. The sublevel caving method without the sill pillar has the particularity in the aspects of mining methods, structural parameters and stoping processes, so that the caving and covering layer forming and the stoping process of the sublevel caving method without the sill pillar on the upper part of an ore body are highly uniform, additional projects are not required to be arranged, and the sublevel caving method without the sill pillar can be realized only by carrying out necessary plans on stoping positions, sequences and advancing speeds. It is for this reason that the transition from cemented filling to sill pillar free sublevel caving is also relatively simple and straightforward. The original main exploitation, lifting transportation, ventilation system and main mining preparation engineering of the cemented filling method are basically fully utilized. As the formation process of the overburden is completed, the transition between the two mining methods will be substantially complete.
(1) Stope layout and structural parameter selection
The segment height is 15m, and 4 segments are arranged, namely a 1595m segment 12, a 1580m segment 13, a 1565m segment 14 and a 1546m segment 15 from top to bottom. Due to the mine's requirement for ore production, the 9-line exploration line restored downward path cemented filling mining to the 1600m level in the west range in 2019. Therefore, according to the current state of mine production, the breakout height of the 1580m segment 9 line is 20m, the breakout height of the 1595m segment 12 line is 20m, the breakout height of the east segment 9 line of the 1580m segment is 15m, the breakout height of the 1565m segment 14 line of the 1586 m segment is 19 m. The route distance and the ore caving step distance are respectively 15m and 2.2 m.
(2) Mining accurate cutting
The mining preparation project mainly comprises a sectional roadway 6, a mineral removal approach 2, an air return raise 10, a cutting drift 5, a connecting road 7 and an ore pass 9.
The subsection roadway 6, the ore pass 9, the air inlet raise and the air return raise 10 are all arranged on the lower tray of the ore body, and the diameter of the ore pass 9 is phi 3.5 m. The sectional roadway 6 is arranged along the vein, the ore removal access road 2 is arranged perpendicular to the trend of the ore body, and the interval is 15m along the trend of the ore body. And (5) tunneling and cutting drifts 5 on the boundary of the ore body and the vertical ore removal route. The sectional roadways 6 are communicated through a mining slope ramp.
The wedge-shaped rock drilling blast hole 1 is drilled in the cutting drift 5, the cutting drift 5 is used as a free surface for blasting to form a cutting groove, and in order to ensure the free surface compensation space when the wedge-shaped blast hole is grooved, the net section size of the cutting drift 5 is 4.6m multiplied by 4.3m (width multiplied by height). When the groove is broached, firstly, a wedge-shaped space is formed on a top plate of a cutting roadway in a shallow hole blasting mode in the cutting roadway, then 6 rows of approximately symmetrical inclined blast holes are respectively arranged on two sides, a first blasting area of the cutting groove is formed in a micro-difference blasting mode, and then the two sides are continuously blasted to form the groove by adopting a fan-shaped hole row surface vertical to the cutting groove roadway. Each row of cutting blast holes has 4 blast holes, the total length of the blast holes is 50m, the diameter of the blast holes is phi 80mm, and the row spacing is 1.4 m.
(3) Recovery operations
The stoping sequence is mined from the upper subsection to the lower subsection in space, and in each subsection, stoping is carried out from the upper tray to the lower tray, and stoping is carried out from the east end to the west end of the ore body gradually and sequentially.
The drilling adopts a Simba1254 type medium-length hole drilling jumbo to drill upward sector-shaped drilling blast holes 1 in a mine removal access 2, each row of a first mining section has 11 blast holes, the longest blast hole depth is 14.3m, the total length of the blast holes on one row surface is 126m, the diameter of the blast holes is phi 80mm, and the row spacing of the blast holes is 2.2 m. Each of the 1580m sections 13 and the 1565m sections 14 has 12 blast holes, the longest blast hole depth is 17.0m, and the total length of the blast holes of one row surface is 155 m. 1546m, each row has 12 blast holes, the longest blast hole depth is 21.8m, and the total length of the blast holes in one row is 168 m. The rock drilling blast hole 1 is filled with granular ammonium nitrate fuel oil explosive by adopting a charging trolley, and a non-electric explosion system is detonated. The exploded ore 11 is removed from the end part of the ore removal route 2 by adopting the existing JCCY-6 diesel carry scraper of the mine, each carry scraper is responsible for ore removal operation of 6 effective routes, and the ore removal capacity of the carry scraper is 38 multiplied by 104t/a according to the average ore removal distance. The ores shoveled out from the stope are conveyed to each subsection ore pass 9 and are lowered to 1430m middle section rail transportation vein channels and rail transportation vein-crossing channels through the pass.
1595m initial mining test segment mainly forms a covering layer and creates good conditions for the mining of the lower segment by a sublevel caving method without a sill pillar. Therefore, ore drawing is carried out in a total amount control ore drawing mode, the ore drawing amount of the step pitch is 40% of the ore caving amount of the step pitch according to the current test production situation, and the rest ore amount is extracted in subsequent subsections.
The 1580m subsection 13 also adopts an ore drawing mode of 'total amount control ore drawing' to control ore drawing, the ore drawing amount of the step pitch is 80% of the ore drawing amount of the step pitch caving, the upper filling body 3 of the middle section of 1554 can be ensured to be completely, fully and safely caving, and a waste rock covering layer required by the sill pillar-free subsection caving method mining is formed. The 1565m section 14 is drawn when the overburden has been formed and can be controlled in a "low dilution draw" mode to recover ore efficiently and adequately within acceptable levels of ore dilution. 1546m section 15 is the last section, and research is considered to use "cut-off grade ore drawing" to recover the ore as much as possible.
Because the elevation of the top plate of the initial stoping route of the 1430m middle section is 1546m, the stoping route bottom plate of the 1546m section 15 of the bottom-pillar-free sublevel caving method is directly positioned above the filler 4 at the lower part of the 1554 middle section according to the designed segmental division. In order to ensure the safety of the last sublevel stoping access, the mining access is probed in advance (drilling, tunneling and the like can be realized), if a gap or a hole which influences the arrangement of a stoping roadway and normal production does not exist between the 1554 middle-section upper filling body 3 and the 1554 middle-section lower filling body 4, the stoping access can be normally tunneled for stoping. If more holes exist in the middle section lower filling body 4 of 1554, certain technical measures (such as pouring cemented filling materials and the like) are adopted for processing, and when the lower filling body can meet the normal production requirement of the upper section, a mining stoping route is tunneled to prepare for the mining work of the 1546m section 14.
(4) Stope ventilation
Fresh air flow required by a stope enters each subsection roadway from the middle section through an air return raise 10, a mining accurate slope ramp 8 and a measure slope ramp, and is introduced into working faces such as ore removal, rock drilling, charging, supporting, tunneling and the like by a local fan.
(5) Stope support
Most of the roadways formed in the current western second mining area are supported by a single-layer shotcrete net, and the thickness of the shotcrete is 100 mm; the metal net is made of round steel with the diameter of 6.5mm, and the mesh degree is 150mm multiplied by 150 mm; the anchor rods are 2.25m long, 18mm in diameter and 1.0m x 1.0m in row spacing. And (3) adopting double-layer shotcrete-anchor net support in a section with slightly poor ore rock, and carrying out support twice, wherein the support parameters of each time are the same as those of single shotcrete-anchor net support.
The stoping access is mainly used for rock drilling, blasting and ore removal during production by a sill pillar-free sublevel caving method, and the existing time is short, so that the adopted supporting mode is single-layer shotcrete-anchor net supporting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A sublevel caving method mining method without a sill pillar under a large-area cemented filling body is characterized in that: the method comprises the following steps:
1) stope layout and structural parameter selection
The height of each segment is 15m, 4 segments are arranged, and the segments are 1595m segments (12), 1580m segments (13), 1565m segments (14) and 1546m segments (15) from top to bottom respectively;
2) mining accurate cutting
Arranging a subsection roadway (6), an ore pass (9), an air inlet patio and an air return patio (10) on the lower tray of an ore body, arranging the subsection roadway (6) along the veins, arranging an ore removal approach (2) vertical to the trend of the ore body, spacing 15m along the trend of the ore body, tunneling a cutting gallery (5) on the boundary of the upper tray of the ore body and vertical to the ore removal approach (2), communicating adjacent subsection roadways (6) through a mining-accurate slope, drilling a wedge-shaped rock drilling blast hole (1) in the cutting gallery (5), and blasting the cutting gallery (5) as a free surface to form a cutting groove;
3) recovery operations
The stoping sequence is mined from an upper subsection to a lower subsection in space, the mining is carried out from the upper plate to the lower plate in each subsection, the mining is carried out from the east end of an ore body to the west end gradually, upward sector-shaped rock drilling blast holes (1) are drilled in an ore removal route (2), 1595m subsections (12) are provided with 10-11 blast holes in each row, the longest blast hole depth is 14.3m, the total length of the blast holes of one row is 118m-126m, the diameter of the blast holes is phi 80mm, the row spacing of the blast holes is 2.2m, the subsection (13) with the length of 1580m and the subsection (14) with the length of 1565m are provided, each row is provided with 11-12 blast holes in total length, the longest blast hole depth is 17.0m, the total length of the blast holes of one row is 146m-155m, the subsection (15) with the length of 1546m, each row is provided with 11-12 blast holes in total length, the longest blast hole depth is 21.8m, and the total length of the blast holes of one row is 150m-168m;
4) stope ventilation
Fresh air flow required by a stope enters each subsection roadway from the middle section through an air inlet raise 23, a mining accurate slope ramp 8 and a measure slope ramp, and the fresh air flow is introduced into a working face by a local fan, such as ore removal, rock drilling, charging, supporting and tunneling;
5) stope support
The roadway is supported by a single-layer shotcrete net, the thickness of the shotcrete is 100mm, the metal net is made of round steel with the diameter of 6.5mm, the net depth is 150mm multiplied by 150mm, the length of an anchor rod is 2.25m, the diameter is 18mm, the row spacing is 1.0m multiplied by 1.0m, the double-layer shotcrete net is adopted for supporting in a section with poor ore rock, the supporting is divided into two times, and the supporting parameters in each time are consistent with the supporting of the single-layer shotcrete net.
2. The sublevel caving method mining method without the sill pillar under the large-area cemented filling body according to claim 1, characterized in that: in the step 2), the diameter of the ore pass (9) is phi 3.5 m.
3. The sublevel caving method mining method without the sill pillar under the large-area cemented filling body according to claim 1, characterized in that: in the step 2), the width multiplied by the height of the net section size of the cutting roadway (5) is 4.6m multiplied by 4.3 m.
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| CN114687748A (en) * | 2022-03-26 | 2022-07-01 | 铜陵有色金属集团股份有限公司 | Construction method for replacing cutting raise to expand groove by tunneling cutting groove of underground drill jumbo |
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