Mining method of V-shaped pseudo-inclined stratified mining with pre-cut top by raise boring machine

Abstract

The present application relates to the field of mining engineering technology, and provides a mining method for V-shaped pseudo-inclined stratified mining with a reverse drilling rig pre-cut top. In this method, the ore body is divided into several stages and pseudo-inclined mining areas, and further divided into several mine rooms and point columns; a reverse drilling rig is arranged in the joint tunnel, and the hole is reversely expanded and brushed along the top plate of the ore body to form a pseudo-inclined cutting uphill; stratified mining is carried out, and shallow holes are drilled in the V-shaped direction in the upper part of the cutting uphill, and the lower layer is arranged by arranging inclined-vertical medium-deep holes, and the uncoupled intermittent charging method and millisecond delay blasting method are used to perform interval lateral blasting to drop the ore; the blasted ore is transported to the chute or the ground by an intelligent scraper; the goaf is treated by anchor net support and waste rock or tailings dry filling point columns. This mining method is suitable for gently inclined medium-thick ore bodies, which can not only improve the mechanical efficiency and safety factor of ore recovery, but also reduce mining costs and improve economic benefits.

Description

Technical Field

[0001] The present application relates to the technical field of mining engineering, and in particular to a mining method for V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top. Background Art

[0002] Gently inclined medium-thick ore bodies refer to ore deposits with an inclination of 5 to 30 degrees and a thickness of 5 to 15 meters. They have the characteristics of gentle inclination, high mining dilution rate, poor safety, low resource recovery rate, high mining cost, and low economic benefits, which seriously affect the safe and efficient mining of ore resources. In order to improve the safe mining efficiency of such ore bodies.

[0003] In order to solve the technical problems encountered in the mining of gently inclined medium-thick ore bodies, such as difficulty in self-sliding and mining site safety, the traditional mining methods were improved and explored during the mining process. For example, in a mining method of a gently inclined ore body with self-sliding in the prior art, A. Ore body division: the ore body is divided into several pan areas along the ore body direction, each pan area is evenly divided into several mine rooms, and the mine rooms are divided into upper and lower layers according to the thickness of the ore body, and the distance between two adjacent mine rooms is 20m; B. Mining construction: the upper layer vein mining tunnel and the lower layer vein mining tunnel are respectively excavated at the top and bottom of the mine room to be mined, and a mine room stone door perpendicular to it is excavated in the middle of the lower layer vein mining tunnel, and an outer vein mining tunnel is excavated at the front end of the mine room stone door; C. Cutting groove construction: a cutting groove with a width of 4m is opened in the middle of the mine room to be mined, the inclination of the cutting groove is the same as that of the ore body, and the cutting groove is perpendicular to the upper layer vein mining tunnel and the lower layer vein mining tunnel; D. Cutting groove support: several rows of evenly arranged Anchor cables are used to support the cutting groove with anchor nets. There are two anchor cables in one row with a row spacing of 4m. The rows of anchor cables are connected with flexible steel belts to make the cutting groove and the top plate of the ore body a whole; E. Bottom extraction: There are two places for bottom extraction, one is the waste rock bottom of the cutting groove to increase the inclination of the ore body and the self-sliding degree of the ore, and the other is the bottom extraction of the ore in the upper layer vein; F. Brush side mining: Use a medium-deep hole trolley to arrange a pair of medium-deep holes on both sides of the cutting groove, with a row spacing of 4 meters. The medium-deep holes are filled with blasting units, and one row on one side is detonated at the same time to throw the ore into the cutting groove; G. Mining: Use a remote-controlled excavator with a maximum excavation distance of 12 meters to scrape the ore scattered outside the cutting groove into the cutting groove, and then use a scraper to shovel the ore in the cutting groove out of the mining area to complete the mining; H. Filling: Dry filling, fill the empty space after mining with phosphogypsum and underground waste slag.

[0004] Although this mining method improves the mining efficiency of gently inclined ore bodies, the amount of blasting work for bottoming out increases, and the blasting cost is higher; the safety factor of using cutting grooves to form free surfaces is low, the construction period is long, and the excavation cost is high; the bottoming out angle is 50 degrees, which prevents some ores from flowing smoothly, and the scope of application is too narrow; detonating one row at a time on one side will not only increase the size of the ore, increase the cost of secondary crushing, but also increase the depletion rate of the ore.

[0005] Therefore, there is an urgent need to provide a technical solution to the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the present application is to provide a mining method for V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] The present application provides a mining method for V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top, comprising: step 1, mining area division: along the inclination direction of the ore body, the ore body is divided into several stages according to a set height interval range; then along the direction of the ore body, each stage is divided into several pseudo-inclined mining areas; each pseudo-inclined mining area includes a mine room, continuous intermediate pillars and ore pillars;

[0009] Step 2, mining and construction: excavate the return air level tunnel in the vein stage, the transport level tunnel in the vein stage, and the upper and lower connecting tunnels of the ore body in the upper and lower parts of the ore body respectively;

[0010] Step 3, cutting work: In each pseudo-inclined mining area, a rock drilling chamber is excavated at the intersection of the center line of the connecting tunnel and the mine room, and a raise drill is arranged in the rock drilling chamber. After drilling a small diameter hole from top to bottom along the roof of the ore body to the upper part of the mine outlet end of the connecting tunnel by the raise drill, the hole diameter is increased in the reverse direction to form a cutting tunnel, and the wall is expanded by rock drilling and blasting to form a cutting uphill tunnel; at the same time, each pseudo-inclined mining area excavates a cutting horizontal tunnel next to the bottom pillar in the ore pillar;

[0011] Step 4, V-type rock drilling and blasting: The ore body is mined in a layered mining manner. When the upper part of the ore body is mined, a shallow hole rock drilling trolley is used to drill the rock vertically in the uphill direction of the cutting, and the air column is filled, the charge column and the electric detonator are installed in the shallow hole by the uncoupled intermittent charging method, and the ore is blasted and dropped at intervals of 0 to 2000 milliseconds from the inside to the outside by using a detonator, and the mine is mined and point columns are left; when the lower part of the ore body is mined, a medium-deep hole is vertically drilled by a medium-deep hole rock drill, and each row of medium-deep holes is arranged obliquely, and a detonator is used to perform lateral blasting and dropping of ore at intervals of 0 to 2000 milliseconds in the order from bottom to top and from outside to inside;

[0012] Step 5: Transportation at the mining site: The blasted ore is transported to a trackless truck using an intelligent scraper, and the trackless truck transports the ore to a chute or the ground;

[0013] Step 6: Mine pressure management: After the upper part of the ore body is mined, the roof is immediately supported by anchor nets. After the lower part of the ore body is mined, waste rock or tailings are piled around the point columns of the ore pillars.

[0014] Preferably, in step 1, the set height interval range is 10 to 30 meters, the length of each pseudo-inclined mining area is 200 to 400 meters, and the inclination angle of the pseudo-inclined mining area is 2 to 3 times the inclination angle of the ore body.

[0015] Preferably, in step 1, the length of the mine chamber is 10 to 20 meters, the width is 10 to 20 meters, and the thickness is the thickness of the ore body.

[0016] Preferably, in step 1, the ore pillars include: point pillars, top pillars, bottom pillars and continuous intermediate pillars; wherein, the length of the point pillars is 10 to 20 meters, the width is 10 to 20 meters, and the thickness is the thickness of the ore body; the width of the top pillar and the bottom pillar is 3 to 5 meters, and the thickness is the thickness of the ore body; the length of the continuous intermediate pillars is the inclined length of the pseudo-inclined mining area, the width is 5 to 10 meters, and the thickness is the thickness of the ore body.

[0017] Preferably, in step 3, the diameter of the small-diameter hole is 250-400 mm, and the diameter of the expanded hole is 2000-3000 mm.

[0018] Preferably, in step 3, the width of the cut up the mountain is 10 to 20 meters, the height is 2 to 4 meters, and the length is the oblique length of the pseudo-inclined mining area.

[0019] Preferably, in step 4, the diameter of the shallow holes is 30-50 mm, and the density coefficient is 0.8-1.2; the diameter of the medium-deep holes is 79-130 mm, and the density coefficient is 0.7-1.3, and they are arranged at an inclination of 60-80 degrees with the point column.

[0020] Preferably, in step 6, the anchor net is anchor rods, anchor cables and metal mesh; wherein the anchor rods are resin anchor rods with a row spacing of 0.6 to 1.2 meters, an anchoring length of 1 / 3 to 1 / 2 of the anchor rods, and an anchor cable with a row spacing of 3 to 6 meters and a length of 4 to 7 meters.

[0021] Preferably, in step 6, the stacking height of the waste rock or tailings is 1 / 3 to 1 / 2 of the point column.

[0022] Beneficial effects:

[0023] The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top provided in the embodiment of the present application first divides the mining area, and divides the ore body into several stages according to a set height interval range along the inclination direction of the ore body; then divides each stage into several pseudo-inclined mining areas along the direction of the ore body; each pseudo-inclined mining area includes: a mine room, continuous intermediate pillars and ore pillars; then, mining and preparation are carried out, and the return air level tunnel in the vein stage, the transport level tunnel in the vein stage and the return air level tunnel are respectively excavated in the upper and lower parts of the ore body. Combined tunnel with filling; then, cutting work is carried out: in each pseudo-inclined mining area, a rock drilling chamber is excavated at the intersection of the center line of the connecting tunnel and the mine room, and a raise drill is arranged in the rock drilling chamber. After the raise drill drills a small diameter hole from top to bottom along the roof of the ore body to the upper part of the combined tunnel for ore exit, the hole diameter is increased in the reverse direction to form a cutting tunnel, and the wall is expanded by rock drilling and blasting to form a cutting tunnel up the mountain; at the same time, each pseudo-inclined mining area excavates a cutting tunnel next to the bottom pillar in the ore pillar; then, V-shaped rock drilling and blasting are used to drop the ore :The ore body is mined in a layered mining manner. When mining the upper part of the ore body, a shallow hole drilling trolley is used to drill vertically in the uphill direction of the cutting, and the shallow holes are filled with air columns, and explosive columns and electric detonators are installed through the uncoupled intermittent charging method. The detonator is used to blast the ore from the inside to the outside with an interval of 0 to 2000 milliseconds, and the mine room is mined, leaving point columns. When mining the lower part of the ore body, medium-deep holes are drilled vertically by a medium-deep hole driller, and each row of medium-deep holes is arranged obliquely. Using detonators, lateral blasting is carried out at intervals of 0 to 2000 milliseconds in a sequence from bottom to top and from outside to inside. Then the mine is transported: the blasted ore is transported to trackless vehicles using intelligent shovel loaders, and the trackless vehicles transport the ore to the chute or the ground. Finally, mine pressure management is carried out: when the upper part of the ore body is mined, the roof is immediately supported by anchor nets. After the lower part of the ore body is mined, waste rock or tailings are piled around the point pillars of the ore pillars to increase the support force of the point pillars, thereby controlling and reducing mine pressure.

[0024] Compared with the existing technology, the cutting tunnel is formed by the raise boring machine instead of the cutting groove, which has low labor intensity, good safety and low cost for forming a blasting free surface; the ore is dropped by V-shaped rock drilling and blasting, which can be mechanized on a large scale and greatly improve the efficiency of ore recovery; the ore is transported by intelligent shovel loaders, which is more efficient and effectively reduces casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0026] Figure 1 A schematic flow chart of a mining method for V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top provided according to some embodiments of the present application;

[0027] Figure 2 A top view of a stope arrangement provided according to some embodiments of the present application;

[0028] Figure 3 for Figure 2 AA cross-section in;

[0029] Figure 4 for Figure 2 BB longitudinal section in.

[0030] Description of reference numerals:

[0031] 1. Return air tunnel in the intra-vein stage; 2. Cutting tunnel; 3. Cutting uphill; 4. Combined tunnel for mining; 5. Connecting tunnel; 6. Continuous intermediate pillars; 7. Top pillars; 8. Point pillars; 9. Bottom pillars; 10. Cutting tunnel; 11. Transport tunnel in the extra-vein stage. DETAILED DESCRIPTION

[0032] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0033] There are many problems in the existing mining of gently inclined ore bodies: the amount of blasting work for bottoming out the bottom plate increases, and the blasting cost increases; the safety factor of using cutting grooves to form free surfaces is low, the construction period is long, and the excavation cost is high; the bottoming out angle is 50 degrees, which makes some ores unable to slide smoothly, and the scope of application is too narrow; detonating one row at a time on one side will not only increase the size of the ore and increase the cost of secondary crushing, but also increase the depletion rate of the ore.

[0034] Based on this, for a gently inclined medium-thick ore body with a dip angle of 13 to 18 degrees, an average dip angle of 15 degrees, an average thickness of 7.2 meters, a strike length of 1,200 meters, and a vertical burial depth of 100 meters, due to the small dip angle of the ore body, the exploded ore body cannot slide freely under the action of gravity, resulting in high ore depletion rate, high labor intensity, high mining cost, and low economic benefits. This application proposes a mining method for V-shaped pseudo-inclined stratified mining with a raise drilling rig pre-cut top, so as to achieve safe, efficient, economical and green mining of gently inclined medium-thick ore bodies.

[0035] Specifically, Figures 1 to 4 As shown in the figure, the mining method of V-shaped pseudo-inclined stratified mining with a reverse well drilling rig pre-cut top includes:

[0036] Step 1: Mining area division: along the inclination direction of the ore body, divide the ore body into several stages according to the set height range; then divide one stage into several pseudo-inclination mining areas along the direction of the ore body; each pseudo-inclination mining area includes a mine room, continuous pillars and ore pillars.

[0037] Among them, the set height interval range is 10~30 meters, each pseudo-inclined mining area is 200~400 meters, and the inclination angle of the pseudo-inclined mining area is 2~3 times the inclination angle of the ore body. In each pseudo-inclined mining area, the length of the mine room is 10~20 meters, the width is 10~20 meters, and the thickness is the thickness of the ore body. The pillars include: point pillars, top pillars, bottom pillars and continuous pillars; the length of the point pillars is 10~20 meters, the width is 10~20 meters, and the thickness is the thickness of the ore body; the width of the top and bottom pillars is 3~5 meters, and the thickness is the thickness of the ore body; the length of the continuous pillars is the oblique length of the pseudo-inclined mining area, the width is 5~10 meters, and the thickness is the thickness of the ore body.

[0038] In a specific example, for a gently inclined medium-thick ore body with an inclination of 13 to 18 degrees, an average inclination of 15 degrees, an average thickness of 7.2 meters, a strike length of 1,200 meters, and a vertical burial depth of 100 meters, the ore body is divided into five stages along the inclination direction at a height of 20 meters, and each stage is divided into four pseudo-inclined mining areas along the strike of the ore body; the length and width of the mine room and point column are both 15 meters, and the thickness is the thickness of the ore body; the width of the continuous pillars between the pseudo-inclined mining areas is 10 meters, the length is the oblique length of the pseudo-inclined mining area, and the thickness is the thickness of the ore body.

[0039] Step 2, mining construction: excavate the return air level tunnel in the vein stage, the transport level tunnel in the vein stage, and the connecting tunnels in the upper and lower parts of the ore body respectively. Specifically, the return air level tunnel in the vein stage is excavated near the top plate, the transport level tunnel in the vein stage is excavated in the lower part 8 meters away from the bottom plate of the ore body, and the return air and filling connecting tunnels are excavated on the center line of each mine room. Here, along the oblique length direction of the pseudo-inclined mining area, the upper part of the ore body and the lower part of the ore body are divided from the bottom to the top 1 / 3.

[0040] Step 3, cutting work: In each pseudo-inclined mining area, a drilling chamber is excavated at the intersection of the center line of the connecting tunnel and the mine room, and a raise drill is arranged in the drilling chamber. After drilling a small diameter hole from top to bottom along the roof of the ore body to the upper part of the joint tunnel for mining, the hole diameter is increased in the reverse direction to form a cutting tunnel, and the wall is expanded by drilling and blasting to cut up the mountain; at the same time, each pseudo-inclined mining area excavates and cuts a horizontal tunnel next to the bottom pillar in the ore pillar.

[0041] Among them, the aperture of the small diameter hole is 250~400 mm, the aperture of the expanded hole is 2000~3000 mm; the width of the cutting uphill is 10~20 meters, the height is 2~4 meters, and the length is the inclined length of the pseudo-inclined mining area. Specifically, the raise boring machine drills a 300 mm small diameter hole from top to bottom along the roof of the ore body. After reaching the upper part of the joint tunnel for mining, the diameter of the drill is increased in the reverse direction to 2000 mm to form a cutting tunnel, and the rock is drilled and blasted to expand the wall to form a cutting uphill for transportation and ventilation.

[0042] Step 4, V-type rock drilling and blasting: The ore body is mined by layered mining. When mining the upper part of the ore body, a shallow hole rock drilling trolley is used to drill the rock vertically in the uphill direction of the cutting, and the air column is filled, the charge column and the electric detonator are installed in the shallow hole by the uncoupled intermittent charging method, and the blasting and ore dropping are carried out from the inside to the outside with an interval of 0 to 2000 milliseconds, and the mine room is mined and point columns are left; when mining the lower part of the ore body, a medium-deep hole rock drill is used to vertically drill medium-deep holes, and each row of medium-deep holes is arranged at an angle. The blasting and ore dropping are carried out at an interval of 0 to 2000 milliseconds in the order from bottom to top and from outside to inside with a detonator. Among them, the aperture of the shallow hole is 30 to 50 mm, and the density coefficient is 0.8 to 1.2; the aperture of the medium-deep hole is 79 to 130 mm, and the density coefficient is 0.7 to 1.3, and it is arranged at an angle of 60 to 80 degrees with the point column.

[0043] In a specific example, when mining the upper part of the ore body, a shallow hole drilling trolley is used in the cutting uphill to drill the rock in a V shape, and horizontal holes (shallow holes) are drilled. The diameter of the shallow holes is 46 mm, and the density coefficient is 1.0; a medium-deep hole drilling machine is used in the lower part of the ore body to drill vertical holes (medium-deep holes), and the angle between each row of holes and the point column is 60 degrees, the diameter of the medium-deep holes is 89 mm, and the density coefficient is 1.0. In other words, when mining the upper part of the ore body, the horizontal holes (shallow holes) drilled vertically in the cutting uphill are cut vertically, and when mining the lower part of the ore body, medium-deep holes are drilled vertically; the shallow holes drilled in the upper part of the ore body are cut vertically uphill, and the medium-deep holes drilled in the lower part of the ore body are inclined holes; the shallow holes in the upper part of the ore body and the medium-deep holes in the lower part of the ore body form a "V"-shaped structure, so that when blasting mining, the whole presents a V-shaped blasting.

[0044] The medium-long holes are filled with air columns, explosive columns and electric detonators by uncoupled intermittent charging method. The air columns are mainly distributed in the empty space, the hole and the hole mouth of the medium-long hole. The length of the air column in the empty space and the hole is 0.5 meters, and the length of the air column at the hole mouth is 1.5 meters. The length of the explosive column is 2.5 meters, mainly distributed between the air columns. Digital electronic detonators are buried inside the explosive column, including 2 in the lower section of the hole, 3 in the middle section of the hole, and 6 in the upper section of the hole. Using the detonator, the shallow hole is blasted from the inside to the outside with an interval of 1000 milliseconds, and the medium-long hole is blasted from the bottom to the top and from the inside to the outside with an interval of 2000 milliseconds.

[0045] Step 5: Transportation at the mining site: The blasted ore is transported to the trackless truck by the intelligent scraper, and the trackless truck transports the ore to the chute or the ground. Specifically, the 5G unmanned on-site intelligent scraper controlled by the ground dispatch room transports the blasted ore to the trackless truck, and the trackless truck transports the ore to the chute or the ground.

[0046] Step 6: Mine pressure management: After the upper part of the ore body is mined, the roof is immediately supported by anchor nets. After the lower part of the ore body is mined, waste rock or tailings are piled around the point columns of the ore pillars.

[0047] Among them, the anchor net is anchor rods, anchor cables and metal mesh; among them, the anchor rods are resin anchor rods with a row spacing of 0.6~1.2 meters and an anchoring length of 1 / 3~1 / 2 of the anchor rods; the anchor cable has a row spacing of 3~6 meters and a length of 4~7 meters; the stacking height of waste rock or tailings is 1 / 3~1 / 2 of the point column.

[0048] In a specific example, the anchor rods are resin anchor rods with a spacing of 1 meter and an anchoring length of 1 / 3 of the anchor rods. The spacing of the anchor cables is 4 meters and the length is 6 meters. After the mining of the lower part of the ore body is completed, waste rock or tailings are piled around the point columns, and the height of the waste rock or tailings is 1 / 2 of the point columns, so that the supporting force of the point columns is increased, thereby controlling and reducing the mine pressure.

[0049] Therefore, the cutting tunnel is formed by the raise boring machine instead of the cutting groove, which has low labor intensity, good safety, and low cost for forming the blasting free face; the V-shaped rock drilling and blasting can realize mechanization on a large scale, greatly improving the efficiency of ore recovery; the intelligent scraper is used to transport the ore, which is more efficient and effectively reduces casualties. It provides effective guarantee for the safe operation of the mine, shortens the free face tunneling period, and increases the mining efficiency of the gently inclined ore body by 10%, greatly saving the mining cost, with good technical and fine effects.

[0050] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mining method for V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top, It is characterized in that include: Step 1: Mining area division: along the inclination direction of the ore body, the ore body is divided into several stages according to the set height interval range; then along the direction of the ore body, each stage is divided into several pseudo-inclination mining areas; each pseudo-inclination mining area includes a mine room, continuous intermediate pillars and ore pillars; Step 2, mining and construction: excavate the return air level tunnel in the vein stage, the transport level tunnel in the vein stage, and the upper and lower connecting tunnels of the ore body in the upper and lower parts of the ore body respectively; Step 3, cutting work: In each pseudo-inclined mining area, a rock drilling chamber is excavated at the intersection of the center line of the connecting tunnel and the mine room, and a raise drill is arranged in the rock drilling chamber. After drilling a small diameter hole from top to bottom along the roof of the ore body to the upper part of the mine outlet end of the connecting tunnel by the raise drill, the hole diameter is increased in the reverse direction to form a cutting tunnel, and the wall is expanded by rock drilling and blasting to form a cutting uphill tunnel; at the same time, each pseudo-inclined mining area excavates a cutting horizontal tunnel next to the bottom pillar in the ore pillar; Step 4, V-type rock drilling and blasting: the ore body is mined in a layered mining manner. When the upper part of the ore body is mined, a shallow hole rock drilling trolley is used to drill rock in the vertical direction of the cutting uphill, and the air column is filled, the charge column and the electric detonator are installed in the shallow hole by the uncoupled intermittent charging method, and the ore is blasted and dropped at intervals of 0 to 2000 milliseconds from the inside to the outside by using a detonator, and the mine is mined and point columns are left; when the lower part of the ore body is mined, medium-deep holes are vertically drilled by a medium-deep hole rock drill, and each row of medium-deep holes is arranged obliquely, and a detonator is used to blast and drop ore at intervals of 0 to 2000 milliseconds in the order from bottom to top and from outside to inside; wherein, the aperture of the shallow hole is 30 to 50 mm, and the density coefficient is 0.8 to 1.2; the aperture of the medium-deep hole is 79 to 130 mm, and the density coefficient is 0.7 to 1.3, and it is arranged at an angle of 60 to 80 degrees to the point column; Step 5: Transportation at the mining site: The blasted ore is transported to a trackless truck using an intelligent scraper, and the trackless truck transports the ore to a chute or the ground; Step 6: Mine pressure management: After the upper part of the ore body is mined, the roof is immediately supported by anchor nets. After the lower part of the ore body is mined, waste rock or tailings are piled around the point columns of the ore pillars.

2. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 1, the height interval is set to range from 10 to 30 meters, the length of each pseudo-inclined mining area is 200 to 400 meters, and the inclination angle of the pseudo-inclined mining area is 2 to 3 times the inclination angle of the ore body.

3. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 1, the length of the mine chamber is 10~20 meters, the width is 10~20 meters, and the thickness is the thickness of the ore body.

4. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 1, the ore pillars include: point pillars, top pillars, bottom pillars and continuous intermediate pillars; wherein, the length of the point pillars is 10~20 meters, the width is 10~20 meters, and the thickness is the thickness of the ore body; the width of the top pillar and the bottom pillar is 3~5 meters, and the thickness is the thickness of the ore body; the length of the continuous intermediate pillars is the inclined length of the pseudo-inclined mining area, the width is 5~10 meters, and the thickness is the thickness of the ore body.

5. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 3, the aperture of the small diameter hole is 250-400 mm, and the aperture of the expanded hole is 2000-3000 mm.

6. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 3, the width of the cut up the mountain is 10 to 20 meters, the height is 2 to 4 meters, and the length is the inclined length of the pseudo-inclined mining area.

7. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 6, the anchor net is composed of anchor rods, anchor cables and metal mesh; wherein, the anchor rods are resin anchor rods with a row spacing of 0.6 to 1.2 meters, an anchoring length of 1 / 3 to 1 / 2 of the anchor rods, and an anchor cable with a row spacing of 3 to 6 meters and a length of 4 to 7 meters.

8. The mining method of V-shaped pseudo-inclined stratified mining with a raise boring machine pre-cut top according to claim 1, It is characterized in that In step 6, the stacking height of waste rock or tailings is 1 / 3~1 / 2 of the point column.

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