CN110295908B - Mining method for gentle dip medium-thickness ore body in fluctuating sectional roadway - Google Patents

Mining method for gentle dip medium-thickness ore body in fluctuating sectional roadway Download PDF

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CN110295908B
CN110295908B CN201910536381.8A CN201910536381A CN110295908B CN 110295908 B CN110295908 B CN 110295908B CN 201910536381 A CN201910536381 A CN 201910536381A CN 110295908 B CN110295908 B CN 110295908B
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ore
roadway
layer
return air
filling
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CN110295908A (en
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马少维
罗周全
胡建华
秦亚光
文磊
董喆喆
丁春胜
代转
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Central South University
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Central South University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/22Methods of underground mining; Layouts therefor for ores, e.g. mining placers

Abstract

The invention discloses a mining method for a gentle dip medium-thickness ore body of an undulating sectional roadway. The method is characterized in that a rail transportation gallery, a mining area slope way, a subsection gallery connecting way and a fluctuating subsection gallery are arranged on a lower plate of an ore body, the connecting way is constructed from a high point of the subsection gallery to the ore body, an upper-layer filling return air gallery, an upper-layer filling return air chamber and an upper-layer filling return air drill hole are formed by penetrating through the ore body, the connecting way is constructed from a low point of the subsection gallery to the ore body, and a lower-layer filling return air gallery, a lower-layer filling return air chamber and a lower-layer filling return air drill hole are formed by penetrating through the ore body. And the strip stope is mined at intervals in two steps, wherein odd-number strip stopes are mined in one step, high-strength cemented filling bodies are filled, even-number strip stopes are mined in the two steps, and low-strength filling bodies are filled. And (3) adopting medium-length hole ore falling, carrying out ore removal by a scraper, and filling in a dead zone afterwards. The invention has the advantages of safe stoping operation, large stope production capacity, less mining and cutting engineering quantity and the like.

Description

Mining method for gentle dip medium-thickness ore body in fluctuating sectional roadway
Technical Field
The invention belongs to the field of underground mining, and particularly relates to a gentle dip medium-thickness ore body mining method for an undulating sectional roadway.
Background
For the gently inclined medium-thickness ore body, especially the gently inclined medium-thickness ore body with the ore body inclination angle larger than 15 degrees, the loading and transporting difficulty of the ore is very high because the equipment climbing capability is limited and the ore body inclination angle is far smaller than the natural repose angle of the ore, and the realization of efficient and safe mining is difficult.
In order to realize the efficient and safe mining of the gently inclined medium-thickness ore body, equipment such as a scraper and a drilling trolley must be selected, and in order to operate supporting equipment, an arrangement form of a slope ramp and a sectional roadway is often adopted. When the sectional height of the arrangement form is small, the arrangement of the drift is facilitated, and the ore dilution loss rate can be effectively controlled, however, under the condition that the middle section height is fixed, the smaller the sectional height is, the more the sectional level roadways are, the more the engineering quantity is obviously increased, the mining-cutting ratio is correspondingly increased, and the unit cost of the ore is also increased; on the contrary, when the section height is larger, under the condition that the middle section height is constant, the number of the section level roadways is smaller, the engineering quantity is relatively less, but the section height is too large, the arrangement of the vein-passing roadway and the rock drilling roadway is not facilitated, and the ore dilution loss rate is relatively higher. In summary, this arrangement allows the determination of the optimum segment height, but does not optimally address both the high cut-to-cut ratio and the high depletion loss.
Therefore, the invention creates a mining method for the gentle dip medium-thickness ore body of the fluctuating sublevel roadway, and aims to comprehensively solve the problems.
Disclosure of Invention
The invention aims to provide a mining method for a gentle dip medium-thickness ore body of an undulating sectional roadway, which is safe, reliable, stable in production capacity and low in production cost. The method is suitable for medium-thickness slowly-inclined ore bodies with ore body inclination angles larger than 15 degrees and medium and stable ore rocks, can reduce the sectional engineering quantity and effectively control the dilution loss rate by arranging the fluctuating sectional roadway, ensures large-scale ore removal, effectively controls the ground pressure by subsequent filling, and finally realizes safe, economic and efficient mining.
In order to solve the technical problem, the gentle dip medium-thickness ore body mining method for the undulating sectional roadway provided by the invention comprises the following steps:
1) dividing an ore body into ore blocks with equal width along the trend, then dividing each ore block into strip-shaped stopes along the trend of the ore body, arranging middle-section transportation galleries along the trend of the ore body on a lower ore body tray, arranging middle-section transportation cross roadways perpendicular to the trend of the ore body every 200m along the trend of the ore body, and tunneling mining area slope roads from openings of the middle-section transportation galleries;
2) excavating a subsection roadway connecting roadway at every 20m vertical height of an opening of a slope way in a self-mining area, arranging subsection roadways along the trend of an ore body, wherein the subsection roadways are arranged in a fluctuating manner, slopes are changed at every 100m, and a subsection roadway high point and a subsection roadway low point are respectively arranged at the central positions of corresponding studs;
3) and (3) tunneling an upper-layer connection roadway to the upper plate of the ore body from the high point of the sublevel roadway to the vertical ore body, continuously tunneling along the direction to form an upper-layer filling return air connection roadway, and then tunneling an upper-layer filling return air roadway from the end of the upper-layer filling return air connection roadway along the trend of the ore body. And arranging an upper layer filling return air chamber at a position about 80m away from the opening of the upper layer filling return air connecting roadway, and arranging a filling return air drilling hole in the upper layer filling return air chamber to the top of the strip stope. In addition, 2 upper layer rock drilling roadways are arranged at the position, close to the 2 strip-shaped stopes of the ore body, of the upper layer connecting roadway along the trend of the ore body;
4) and (3) tunneling a lower-layer connection roadway to an upper ore body plate from a low-point vertical ore body of the sublevel roadway, continuously tunneling along the direction to form a lower-layer filling return air connection roadway, and then tunneling a lower-layer filling return air roadway from the end of the lower-layer filling return air connection roadway along the direction of the ore body. And arranging a lower-layer filling return air chamber at a position about 80m away from the opening of the lower-layer filling return air communication roadway, and arranging a filling return air drilling hole in the lower-layer filling return air chamber to the top of the strip stope. In addition, 2 lower-layer rock drilling roadways are arranged at the positions, close to the 2 strip-shaped stopes of the ore body, of the lower-layer connecting roadways along the trend of the ore body;
5) arranging a water drainage drilling chamber outside the low point of the self-segmentation roadway, drilling a water drainage drilling hole to a middle-segment drainage connection roadway under the water drainage drilling chamber, wherein the drainage connection roadway is communicated with the middle-segment transportation cross roadway;
6) an upper-layer ore chute chamber is arranged on the outer side of a high point of the sectional roadway, and an upper-layer ore chute is tunneled downwards to the middle-section transportation cross roadway in the upper-layer ore chute chamber;
7) and a lower-layer ore chute chamber is arranged about 10m away from the opening of the rock drilling roadway from the lower-layer connecting roadway, and a lower-layer ore chute is tunneled downwards to the middle-section transportation cross roadway in the lower-layer ore chute chamber.
The width of the ore block is 100m, and the width of the strip stope is determined according to the physical and mechanical properties of ore rocks.
The mining area slope ramp is arranged every 600m and is responsible for transporting personnel and materials of 300m ore bodies left and right, and the slope is less than or equal to 15%.
The segmentation tunnel is the undulation form, and the slope of falling slope and climbing slope all equal to 10%, the discrepancy in height of segmentation tunnel high point and segmentation tunnel low point is 10 m.
The upper layer connecting roadway and the upper layer filling and air returning connecting roadway are in a climbing shape, the climbing gradient is less than or equal to 3 thousandths, the lower layer connecting roadway and the lower layer filling and air returning connecting roadway are in a climbing shape, and the climbing gradient is less than or equal to 3 thousandths.
The filling return air drill hole is used for stope blasting ventilation and stope subsequent filling, and 2 drainage drill holes in the drainage drill hole chamber are usually needed to be arranged, and one drainage drill hole is used for standby.
The strip stope is mined at intervals in two steps, odd-numbered strip stopes are mined in one step, high-strength cemented filling bodies are filled, even-numbered strip stopes are mined in two steps, low-strength filling bodies are filled, medium-deep hole ore falling is adopted in stope mining, caving ore is removed by a scraper, a goaf is filled afterwards after stope mining is finished, ore is removed from the end of the rock drilling roadway by a non-remote control scraper after each blasting of the stope, the ore removal amount is one third of the ore removed in each caving, and after all ore in the stope is collapsed, ore is removed from the end of the rock drilling roadway by the remote control scraper until all ore in the whole stope is removed.
Advantageous effects
The advantages and positive effects of the invention include: the first and the second sectional roadways are arranged in a wavy shape, the through-vein roadways are also arranged in a staggered manner in a vertical space, and the vertical height difference of adjacent through veins is 10m, so that ore bodies can be controlled more easily, and the dilution loss rate can be greatly reduced; secondly, as the sectional roadway is arranged in a fluctuant shape, compared with the arrangement of a flat slope sectional roadway, the sectional roadway has the advantages that the sectional roadway engineering amount is reduced by half and the mining-cutting ratio is greatly reduced on the premise that 10m of an ore body is controlled in the vertical direction; the third, upper layering connecting lane (or upper layering connecting lane) can stope about 100m for 4, the mining and cutting engineering utilization rate is high, and the cooperative management and control and equipment regulation and control are facilitated; fourthly, in all mining and cutting projects, all the tunnel projects with the gradient larger than 3 per thousand only operate no-load equipment and material transporting equipment, and the gradients of the tunnels operated by ore transporting equipment are not larger than 3 per thousand, so that the working efficiency of the ore transporting equipment can be greatly improved, and the popularization of a full-automatic scraper is facilitated; fifthly, the water drainage drilling chamber is arranged at the lowest point of the segmented roadway, so that underground water, equipment water and filler water are collected, roadway roads are prevented from being muddy, and the operation efficiency of equipment is improved; sixthly, a filling return air drilling hole is specially arranged, so that the ventilation condition is good, and the filling roof contact and ground pressure control are facilitated; and seventhly, blasting ore falling adopts a fan-shaped medium-length hole differential blasting mode, the unit consumption of explosives and detonators is low, the ore quantity in one-time blasting is large, intensive ore removal of the scraper can be realized, and the working efficiency of the automatic scraper is improved.
Drawings
FIG. 1 is a cross-sectional view taken along line A-A of the present invention;
FIG. 2 is a top view of the present invention B-B;
FIG. 3 is a side view of the present invention C-C;
in the figure: 1-middle section transportation roadway; 2-middle section transportation cross drift; 3-mining area slope ramp; 4-segmenting the roadway; 4-1-sectional roadway high points; 4-2-sectional roadway low points; 5-1-upper level connecting lane; 5-2-lower level connection lane; 6-1-upper rock drilling roadway; 6-2-lower rock drilling roadway; 7-1-upper layer chute chamber; 7-2-lower layer chute chamber; 8-1-upper layer chute; 8-2-lower layer chute; 9-draining and drilling; 10-1-upper layer is filled with a return air connection roadway; 10-2-the lower layer is filled with a return air connection roadway; 11-1-upper layer filling return airway; 11-2-filling a return airway at the lower layer; 12-1-filling a return air chamber at the upper layer; 12-2-filling a return air chamber at the lower layer; 13-1-filling air return drill holes in the upper layer; 13-2-filling air return drill holes in the lower layer; 14-sector medium-length hole; 15-1-high strength filler; 15-2-low strength filler; 16-collecting the ore trench; 17-studs; 18-sectional lane connecting lanes; 19-a drainage drilling chamber; and 20-middle section drainage communication lane.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1, fig. 2 and fig. 3, a gentle dip medium-thickness ore body mining method for an undulating sectional roadway according to an embodiment of the present invention includes the following steps:
1) dividing an ore body into ore blocks I with equal width along the trend, and then dividing each ore block I into strip-shaped stopes II along the trend of the ore body;
2) arranging middle-section transportation drifts 1 along the trend of the ore body on the ore body lower tray, and arranging middle-section transportation cross lanes 2 perpendicular to the trend of the ore body at intervals of 200m along the trend of the ore body;
3) excavating a mining area slope ramp 3 from an opening of the middle-section transportation drift 1;
4) excavating a subsection roadway connecting road 18 at an opening of 20m vertical height from the mining area slope road 3, arranging a subsection roadway 4 along the trend of an ore body, wherein the subsection roadway is arranged in a fluctuating shape, slopes are changed at intervals of 100m, and a subsection roadway high point 4-1 and a subsection roadway low point 4-2 are respectively arranged in the center of a corresponding stud 17;
5) and (3) vertically tunneling an upper-layer connecting roadway 5-1 from a high point 4-1 of the sublevel roadway to an upper plate of the ore body, continuously tunneling along the direction to form an upper-layer filling air return connecting roadway 10-1, and then tunneling an upper-layer filling air return roadway 11-1 from the end of the upper-layer filling air return connecting roadway 10-1 along the direction of the ore body. An upper layer filling return air chamber 12-1 is arranged at a position which is about 80m away from an opening of the upper layer filling return air connecting roadway 11-1, and upper layer filling return air drill holes 13-1 are arranged in the upper layer filling return air chamber 12-1 to the top of the strip stope II. In addition, 2 upper rock drilling roadways 6-1 are arranged at the position, close to the lower plate of the 2 strip-shaped stopes II of the ore body, of the upper-layer connecting roadway 5-1 along the trend of the ore body;
6) and vertically tunneling a lower-layer connecting roadway 5-2 from a low point 4-2 of the sublevel roadway to an upper plate of the ore body, continuously tunneling along the direction to form a lower-layer filling air return connecting roadway 10-2, and then tunneling a lower-layer filling air return roadway 11-2 from the end of the lower-layer filling air return connecting roadway 10-2 along the direction of the ore body. A lower layer filling return air chamber 12-2 is arranged at a position which is about 80m away from the opening of the lower layer filling return air connecting roadway 11-2, and lower layer filling return air drill holes 13-2 are arranged in the lower layer filling return air chamber 12-2 to the top of the strip stope II. In addition, 2 lower-layer rock drilling roadways 6-2 are arranged at the position, close to the lower wall of the 2 strip-shaped stopes II of the ore body, of the lower-layer connecting roadway 5-2 along the trend of the ore body;
7) a water drainage drilling chamber 19 is arranged outside the low point 4-2 of the sectional roadway, a water drainage drilling hole 9 is drilled downwards to a middle section water drainage connection roadway 20 under the water drainage drilling chamber 19, and the middle section water drainage connection roadway 20 is communicated with the middle section transportation cross roadway 2;
8) an upper-layer ore chute chamber 7-1 is arranged outside a high point 4-1 of the sectional roadway, and an upper-layer ore chute 8-1 to a middle-section transportation cross roadway 2 is tunneled downwards from the upper-layer ore chute chamber 7-1;
9) a lower layer ore chute chamber 7-2 is arranged from the lower layer connecting roadway 5-2 to the opening of the lower layer rock drilling roadway 6-2 by about 10m, and a lower layer ore chute 8-2 is tunneled downwards to the middle section transportation cross roadway 2 from the lower layer ore chute chamber 7-2;
10) in order to further illustrate the superiority of the mining method, the mining process is further described in combination with mining and cutting engineering.
Firstly, the mining method adopts interval stoping in stoping sequence, namely stoping in two steps, namely, after stoping and filling of an odd-numbered strip stope in one step are finished, and after the strength of a filling body meets the stoping requirement of an adjacent ore body, carrying out two-step stoping work of the adjacent even-numbered strip stope;
secondly, in a strip stope II, a raise drilling machine is adopted to drill and cut a raise upwards at the top of an upper rock drilling lane 6-1 (or a lower rock drilling lane 6-2) and then a medium-length hole rock drilling trolley is adopted to drill and blast an upper sector medium-length hole 14 to form a cutting groove, and the formed cutting groove is communicated with an upper layer filling return air drilling hole 11-1 (or a lower layer filling return air drilling hole 11-2);
thirdly, the cutting groove is used as a free surface, the medium-length hole drilling trolley drills an upward fan-shaped medium-length hole 14 along the upper layer rock drilling lane 6-1 (or the lower layer rock drilling lane 6-2) in parallel with the cutting groove, row-by-row blasting is carried out by adopting a differential blasting mode to form an ore collecting trench 16, and blasted ore is collected through the ore collecting trench 16 and falls into the upper layer rock drilling lane 6-1 (or the lower layer rock drilling lane 6-2).
For ore falling into the upper rock drilling roadway 6-1, the scraper reaches a ore falling point through a middle-section transportation roadway 1, a mining area slope ramp 3, a sectional roadway connecting roadway 18, a sectional roadway 4, a sectional roadway high point 4-1, an upper-layer connecting roadway 5-1 and an upper rock drilling roadway 6-1. The ores shoveled and dropped into the upper rock drilling roadway 6-1 are poured into an upper ore pass through the upper rock drilling roadway 6-1, an upper connecting roadway 5-1, a subsection roadway high point 4-1 and an upper ore pass chamber 7-1 to form an upper ore pass 8-1. Then the scraper carries out reciprocating and circulating ore removal work between an ore falling point of the upper rock drilling roadway 6-1 and an upper slide mine chamber 7-1.
For ore falling into the lower rock drilling roadway 6-2, the scraper reaches a ore falling point through a middle-section transportation roadway 1, a mining area slope way 3, a sectional roadway connecting way 18, a sectional roadway 4, a sectional roadway low point 4-2, a lower-layer connecting roadway 5-2 and a lower rock drilling roadway 6-2. The ores shoveled and dropped into the lower rock drilling roadway 6-2 pass through the lower rock drilling roadway 6-2, the lower connecting roadway 5-2 and the lower ore chute chamber 7-2 and are poured into the lower ore chute 8-2. Then the scraper carries out reciprocating and circulating ore removal work between the ore falling point of the lower rock drilling roadway 6-2 and the lower ore pass chamber 7-2.
And fourthly, in order to realize safe and efficient stoping of the stope, smooth stope ventilation is necessary. Fresh airflow enters an upper rock drilling roadway 6-1 (or a lower rock drilling roadway 6-2) through a middle-section transportation drift 1, a mining area slope 3, a subsection roadway connecting roadway 18, a subsection roadway 4 and an upper layer connecting roadway 5-1 (or a lower layer connecting roadway 5-2), then dust and toxic and harmful gas in the upper rock drilling roadway 6-1 (or the lower layer rock drilling roadway 6-2) are carried, and air returns to a return air main roadway section by section through an upper layer filling return air drilling hole 13-1 (or a lower layer filling return air drilling hole 13-2) and an upper layer filling return air roadway 11-1 (or a lower layer filling return air roadway 11-2), so that series connection of dirty wind is avoided;
in order to realize safe and efficient stoping in stopes, a smooth drainage system is necessary. Production water and filler filtered water of the upper rock drilling lane 6-1 reach the drainage drilling chamber 19 through an upper layer connecting lane 5-1, a sectional lane high point 4-1 and a sectional lane low point 4-2, sewage is discharged to the middle section drainage connecting lane 20 through the drainage drilling hole 9, and then the sewage is drained to a drainage system sump through the middle section transport cross lane 2 and a ditch of the middle section transport flat lane 1; production water and filler filtered water of the lower rock drilling roadway 6-2 reach the drainage drilling chamber 19 through the lower connecting roadway 5-2 and the low points 4-2 of the sectional roadways, sewage is discharged to the middle drainage connecting roadway 20 through the drainage drilling holes 9, and then the sewage is drained to a drainage system sump through the middle transport cross roadway 2 and the water ditches of the middle transport level 1; (ii) a
Sixthly, in order to effectively control stope ground pressure, ensure safe operation and improve the recovery rate, subsequent filling needs to be carried out on the strip-shaped stope II which is completely recovered. Firstly, filling retaining walls are arranged at openings on two sides of an upper-layer rock drilling roadway 6-1 (or a lower-layer rock drilling roadway 6-2), then filling pipelines pass through a subsection roadway 4, an upper-layer connecting roadway 5-1 (or a lower-layer connecting roadway 5-2), an upper-layer filling return air drilling connecting roadway 10-1 (or an upper-layer filling return air drilling connecting roadway 10-2), an upper-layer filling return air roadway 11-1 (or a lower-layer filling return air roadway 11-2) and an upper-layer filling return air chamber 12-1 (or a lower-layer filling return air chamber 12-2) to be erected into an upper-layer filling return air drilling hole 13-1 (or a lower-layer filling return air drilling hole 13-2), finally, cemented filling materials into a strip-shaped stope II dead zone, and mining adjacent stopes can be mined after the filling is maintained for 28 days, wherein stopes obtained by the odd-number strip-shaped stopes in one step are filled with high-strength filling bodies, and (4) filling the stopes with the stope stoping completion of the even-numbered strip stopes in the two steps by using low-strength filling bodies 15-2.
The width of the ore block I is 100 m.
The width of the strip stope II is determined to be 12.5m according to the physical and mechanical properties of the ore rock.
The mining area slope ramp 3 is arranged every 600m and is responsible for transporting personnel and materials of 300m ore bodies left and right, and the slope is less than or equal to 15 percent.
The sectional roadway 4 is in a fluctuant shape, and the slope of the descending slope and the slope of the climbing slope are both equal to 10%.
The height difference between the high point 4-1 of the sectional roadway and the low point 4-2 of the sectional roadway is 10 m.
The upper layer connecting lane 5-1 and the upper layer filling air return connecting lane 10-1 are in a climbing shape, and the climbing gradient is less than or equal to 3 thousandth
The lower layer connecting lane 5-2 and the lower layer filling return air connecting lane 10-2 are in a climbing shape, and the climbing gradient is less than or equal to 3 thousandth
The upper layer filled return air drill hole 13-1 and the lower layer filled return air drill hole 13-2 are used for strip stope II blasting ventilation and subsequent filling.
The drainage boreholes 9 in the drainage borehole chamber 19 are typically arranged in 2, one for each use.
And the subsequent filling refers to that after stope recovery is finished, a filling retaining wall is arranged at an opening communicated with the stope, and then cemented filling materials are used for filling and roof connecting through a filling return air drilling hole.
The invention is suitable for the gently inclined medium-thickness ore body, and is particularly suitable for large-scale modern deep mines. Compared with other mining methods, the mining method is low in mining-cutting ratio, low in dilution loss rate, safe, reliable, stable in production capacity and high in intensification degree, and finally safe, economical and efficient mining is achieved by effectively controlling ground pressure through subsequent filling.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. A mining method for a gentle dip medium-thickness ore body of an undulating sectional roadway is characterized by comprising the following steps:
1) dividing an ore body into ore blocks with equal width along the trend, then dividing each ore block into strip-shaped stopes along the trend of the ore body, arranging middle-section transportation galleries along the trend of the ore body on a lower ore body tray, arranging middle-section transportation cross roadways perpendicular to the trend of the ore body every 200m along the trend of the ore body, and tunneling mining area slope roads from openings of the middle-section transportation galleries;
2) excavating a subsection roadway connecting roadway at every 20m vertical height of an opening of a slope way in a self-mining area, arranging subsection roadways along the trend of an ore body, wherein the subsection roadways are arranged in a fluctuating manner, slopes are changed at every 100m, and a subsection roadway high point and a subsection roadway low point are respectively arranged at the central positions of corresponding studs;
3) tunneling an upper-layer connection roadway to an ore body upper wall from a high point of a sectional roadway vertical to the ore body, continuously tunneling to the direction of the ore body upper wall to form an upper-layer filling return air connection roadway, then tunneling the upper-layer filling return air roadway from the end of the upper-layer filling return air connection roadway along the trend of the ore body, arranging an upper-layer filling return air chamber at a position about 80m away from the opening of the upper-layer filling return air connection roadway, arranging a filling return air drilling hole in the upper-layer filling return air chamber to the top of a strip-shaped stope, and arranging 2 upper-layer rock drilling roadways at the position of the upper-layer connection roadway close to a lower wall of the 2 strip-shaped stopes of the ore body;
4) tunneling a lower-layer connection roadway to an upper ore body wall from a low-point vertical ore body of a sublevel roadway, continuously tunneling along the direction to form a lower-layer filling return air connection roadway, then tunneling the lower-layer filling return air roadway from the end of the lower-layer filling return air connection roadway along the direction of the ore body, arranging a lower-layer filling return air chamber at a position about 80m away from the opening of the lower-layer filling return air connection roadway, arranging filling return air drill holes in the lower-layer filling return air chamber to the top of a strip-shaped stope, and arranging 2 lower-layer rock drilling roadways at the position, close to the lower plate of the 2 strip-shaped stopes, of the ore body in the lower;
5) arranging a water drainage drilling chamber outside the low point of the self-segmentation roadway, drilling a water drainage drilling hole to a middle-segment drainage connection roadway under the water drainage drilling chamber, wherein the drainage connection roadway is communicated with the middle-segment transportation cross roadway;
6) an upper-layer ore chute chamber is arranged on the outer side of a high point of the sectional roadway, and an upper-layer ore chute is tunneled downwards to the middle-section transportation cross roadway in the upper-layer ore chute chamber;
7) a lower-layer ore chute chamber is arranged about 10m away from the opening of the rock drilling roadway from the lower-layer connecting roadway, and a lower-layer ore chute is tunneled downwards to the middle-section transportation cross roadway in the lower-layer ore chute chamber;
8) the strip stope is mined at intervals in two steps, odd-number strip stopes are mined in one step, high-strength cemented filling bodies are filled, even-number strip stopes are mined in the two steps, and low-strength filling bodies are filled;
9) and (2) adopting medium-length hole ore dropping in stope stoping, adopting a scraper to remove the ore from the caving ore, filling a goaf later after stoping ore removal is finished, adopting a non-remote control scraper to remove ore from the end of the rock drilling roadway after stope blasting each time, wherein the ore removal amount is one third of that of the ore from caving each time, and adopting a remote control scraper to remove ore from the end of the rock drilling roadway after the stope ore is completely collapsed until the whole stope ore is completely removed.
2. The method for mining moderately-thick ore bodies in gentle dip of undulating sectional roadway according to claim 1, wherein: the width of the ore block is 100m, and the width of the strip stope is determined according to the physical and mechanical properties of ore rocks.
3. The method for mining moderately-thick ore bodies in gentle dip of undulating sectional roadway according to claim 1, wherein: the mining area slope ramp is arranged every 600m and is responsible for transporting personnel and materials of 300m ore bodies left and right, and the slope is less than or equal to 15%.
4. The method for mining moderately-thick ore bodies in gentle dip of undulating sectional roadway according to claim 1, wherein: the segmentation tunnel is the undulation form, and the slope of falling slope and climbing slope all equal to 10%, the discrepancy in height of segmentation tunnel high point and segmentation tunnel low point is 10 m.
5. The method for mining moderately-thick ore bodies in gentle dip of undulating sectional roadway according to claim 1, wherein: the upper layer connecting roadway and the upper layer filling and air returning connecting roadway are in a climbing shape, the climbing gradient is less than or equal to 3 thousandths, the lower layer connecting roadway and the lower layer filling and air returning connecting roadway are in a climbing shape, and the climbing gradient is less than or equal to 3 thousandths.
6. The method for mining moderately-thick ore bodies in gentle dip of undulating sectional roadway according to claim 1, wherein: the filling return air drill hole is used for stope blasting ventilation and stope subsequent filling, and 2 drainage drill holes in the drainage drill hole chamber are usually needed to be arranged, and one drainage drill hole is used for standby.
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