Two-step sublevel open-stope subsequent filling mining method for goaf of underground stope

Abstract

The invention provides a two-step sublevel open-stope subsequent filling mining method for a goaf of an underground stope, and relates to the technical field of underground metal mine mining. The method comprises the steps that stopes are segmented in the trend of an ore body, first-step stopes and second-step stopes are alternately arranged, and the width of the first-step stopes and the width of the second-step stopes are consistent with the thickness of the ore body; stope preparation and cutting engineering arrangement; the segmented roadways are communicated with the segmented stopes, the segmented roadways enter the corresponding segmented stopes through the segmented connection ways, the winches are connected with one another for ore removal, the pedestrian drainage ventilation raise is used for drainage and enters the end parts of the stopes through the rock drilling ore removal roadways, and the cutting wells are constructed upwards from the end parts of the stopes to form initial blasting spaces; the stope is subjected to stoping and filling; and according to a bottom-to-top stoping rule, blasting the initial blasting space in sequence according to a stoping sequence, removing ore to a draw shaft by utilizing a carry-scraper, filling by adopting graded tailings, and alternately filling the stope in the first step and the stope in the second step in the stope.

Description

Technical Field

[0001] The invention relates to the technical field of underground metal mining, in particular to a two-step segmented empty field and subsequent filling mining method for an underground mining field goaf area. Background Art

[0002] At present, in underground mining, the sub-level empty-field and subsequent filling mining method is suitable for mining areas with thick ore bodies, large inclinations, and medium ore rock stability. Affected by the geological environment, after certain changes in the geological environment, the sub-level empty-field and subsequent filling mining method is still applicable, but it still needs to be adjusted according to the on-site engineering layout.

[0003] According to the conventional two-step mining plan, only the mining order of the mining site is considered, and there are not too many requirements for filling the space after mining, which cannot achieve cost reduction, efficiency improvement, energy conservation and emission reduction. Summary of the invention

[0004] In order to solve a technical problem existing in the prior art, the embodiment of the present invention provides an upward segmented empty field subsequent filling mining method. In order to achieve cost reduction, efficiency improvement, energy conservation and emission reduction in the mining production process, it is important to fully consider the filling requirements of the goaf. The technical solution is as follows:

[0005] A two-step segmented empty area and subsequent filling mining method for underground stope goaf, comprising a stope, a chute, a chute connecting road, a segmented connecting road, a segmented roadway and a pedestrian drainage ventilation shaft, comprising the following steps:

[0006] S1. Segment the stope along the direction of the ore body, alternately arrange the first-step stope and the second-step stope, and the width of the first-step stope and the width of the second-step stope are consistent with the thickness of the ore body;

[0007] S2, stope preparation and cutting engineering layout;

[0008] Among them, the segmented roadway is connected with each segmented stope, and the segmented roadway enters the corresponding segmented stope through the segmented connecting road. The chute and the chute are connected for mining, and the pedestrian drainage ventilation skylight is used for drainage. The end of the stope is entered through the rock drilling mine exit roadway, and a cutting well is constructed upward from the end of the stope to form an initial blasting space;

[0009] S3, mining and filling the stope;

[0010] Among them, following the bottom-up mining rule, the initial blasting space is blasted in sequence according to the order of mining withdrawal, the mine is unloaded to the chute by a scraper, and graded tailings are used for filling. The one-step mining area and the two-step mining area are alternately filled in the mining area.

[0011] Optionally, the filling with graded tailings includes:

[0012] High-strength filling bodies are used to fill the 6m height range at the bottom of the first mining section of any middle section of the mining field, and the mining field is alternately filled with low-strength filling bodies and micro-cemented filling bodies. High-strength filling bodies are used to fill the 50cm range at the top of the section.

[0013] Optionally, the alternating filling of the one-step stope and the two-step stope in the stope includes:

[0014] The first-step stope is filled with low-strength filling material;

[0015] In the second step, the stope is filled with micro-cemented filling material.

[0016] Optionally, the first mining segment includes: the bottom of the middle segment, the stope in the first mining segment and the top of the middle segment arranged sequentially from bottom to top;

[0017] The bottom of the middle section is 6m high;

[0018] The stopes in the first mining segment include: a one-step stope and a two-step stope that are alternately arranged horizontally;

[0019] The top of the middle section is 50 cm high.

[0020] Optionally, the lime-sand ratio of the high-strength filler is 1:4;

[0021] The lime-sand ratio of the low-strength filling body is 1:10;

[0022] The lime-sand ratio of the micro-cemented filling body is 1:20.

[0023] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0024] By adopting the above technical scheme, the ore body is divided along the strike, and the two-step stopes are arranged alternately to carry out the mining and cutting work. After the mining is completed, the strength of each section is divided, and high-strength filling and two-step filling are carried out respectively. The two-step stopes are arranged alternately, and low-strength filling and micro-cemented filling are carried out respectively. While reducing the cement consumption, the utilization rate of solid waste such as tailings is increased, the filling cost is effectively saved, and the efficient recycling of solid waste is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a cross-sectional view of the two-step segmented emptying and subsequent filling mining method of the underground stope goaf of the present invention ( Figure 2 AA section view);

[0027] Figure 2 It is a BB cross-sectional view of the present invention;

[0028] Figure 3 It is a CC cross-sectional view of the present invention;

[0029] In the figure: 1- chute, 2- chute connecting road, 3- rail transport middle section, 4- auxiliary middle section, 5- auxiliary ramp, 6- service shaft, 7- segmented tunnel, 8- segmented connecting tunnel, 9- segmented vein inner tunnel (through vein), 10- segmented vein outer tunnel (through vein), 11- pedestrian drainage ventilation skylight, 12- false tunnel, 13- rock drilling tunnel, 14- cutting shaft, 15- cutting groove, 16- upward fan-shaped medium and deep hole, 17- cementation filling body (first step 1:10 / second step micro-cementation 1:20), 18- pouring surface (50cm / 1:4), 19- first mining segmented false roof filling body (1:4). DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0032] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0033] The stopes are arranged parallel to the direction of the ore body, and two-step stopes are arranged alternately to carry out the mining and cutting work. After the mining is completed, the strength of each section is divided, and high-strength filling and two-step filling are carried out respectively. The two-step stopes are arranged alternately, and low-strength filling and micro-cemented filling are carried out respectively. While reducing the amount of cement, the utilization rate of solid waste such as tailings is increased, the filling cost is effectively saved, and the efficient reuse of solid waste is realized. The specific plan is as follows:

[0034] A two-step segmented empty area and subsequent filling mining method for underground stope goaf, comprising a stope, a chute, a chute connecting road, a segmented connecting road, a segmented roadway and a pedestrian drainage ventilation shaft, comprising the following steps:

[0035] S1. Segment the stope along the direction of the ore body, alternately arrange the first-step stope and the second-step stope, and the width of the first-step stope and the width of the second-step stope are consistent with the thickness of the ore body;

[0036] S2, stope preparation and cutting engineering layout;

[0037] Among them, the segmented roadway is connected with each segmented stope, and the segmented roadway enters the corresponding segmented stope through the segmented connecting road. The chute and the chute are connected for mining, and the pedestrian drainage ventilation skylight is used for drainage. The end of the stope is entered through the rock drilling mine exit roadway, and a cutting well is constructed upward from the end of the stope to form an initial blasting space;

[0038] S3, mining and filling the stope;

[0039] Among them, following the bottom-up mining rule, the initial blasting space is blasted in sequence according to the order of mining withdrawal, the mine is unloaded to the chute by a scraper, and graded tailings are used for filling. The one-step mining area and the two-step mining area are alternately filled in the mining area.

[0040] In a specific implementation manner, the filling using graded tailings includes:

[0041] High-strength filling bodies are used to fill the 6m height range at the bottom of the first mining section of any middle section of the mining field, and the mining field is alternately filled with low-strength filling bodies and micro-cemented filling bodies. High-strength filling bodies are used to fill the 50cm range at the top of the section.

[0042] In a specific implementation manner, the alternating filling of the one-step stope and the two-step stope in the stope includes:

[0043] The first-step stope is filled with low-strength filling material;

[0044] In the second step, the stope is filled with micro-cemented filling material.

[0045] The first mining section includes: the bottom of the middle section, the stope in the first mining section and the top of the middle section arranged from bottom to top;

[0046] The bottom of the middle section is 6m high;

[0047] The stopes in the first mining segment include: a one-step stope and a two-step stope that are alternately arranged horizontally;

[0048] The top of the middle section is 50 cm high.

[0049] Among them, the mining areas outside the first mining section also include one-step mining areas and two-step mining areas. From top to bottom, the one-step mining areas and the two-step mining areas are alternately arranged. In the horizontal direction, the one-step mining areas and the two-step mining areas are alternately arranged. Moreover, the setting method of the one-step mining areas and the two-step mining areas in the mining areas within the first mining section and the connection of the mining areas outside the first mining section is also to follow the alternating setting of one step and two steps in the horizontal and vertical directions.

[0050] Wherein, the lime-sand ratio of the high-strength filler is 1:4;

[0051] The lime-sand ratio of the low-strength filling body is 1:10;

[0052] The lime-sand ratio of the micro-cemented filling body is 1:20.

[0053] The specific principles of the present invention are as follows:

[0054] Stope layout: The stopes are divided along the strike of the ore body, and two-step mining is carried out. One-step stopes and two-step stopes are arranged alternately. No top pillars, bottom pillars or intermediate pillars are left in the stopes, and the stope width is consistent with the thickness of the ore body.

[0055] Layout of mining site preparation and cutting engineering: each section mining site is connected by section tunnels, and the mining site is entered through section connecting roads. Chutes and chute connecting roads are used for mining, and pedestrian drainage and ventilation shafts are used for drainage. The end of the mining site is entered through the rock drilling exit tunnel, and a cutting shaft is constructed from the end upward to create the initial blasting space.

[0056] Mining and backfilling in the mine: Mining is done from bottom to top, blasting compensation space is formed by slotting holes, and the mine is transported to the chute by a scraper, and graded tailings are used for backfilling. Each middle section is first mined and divided into sections for intensity, and two steps of alternating backfilling are carried out in the mine.

[0057] A middle section of the mining area is divided into three sections. The first mining layer in the middle section will become the roof of the next middle section. The strength is divided in the first mining section. The bottom 6m and the top 50cm are filled with high-strength filling bodies, and the remaining two sections are alternately filled with low-strength filling bodies and micro-cemented filling bodies. The top 50cm of both sections are filled with high-strength filling bodies to meet driving requirements.

[0058] The first-step stope is filled with low-strength filling bodies, and the second-step stope is filled with micro-cemented filling bodies.

[0059] The lime-sand ratio of the high-strength filling body is 1:4, the lime-sand ratio of the low-strength filling body is 1:10, and the lime-sand ratio of the micro-cemented filling body is 1:20.

[0060] By adopting the above technical scheme, the ore body is divided along the strike, and the two-step stopes are arranged alternately to carry out the mining and cutting work. After the mining is completed, the strength of each section is divided, and high-strength filling and two-step filling are carried out respectively. The two-step stopes are arranged alternately, and low-strength filling and micro-cemented filling are carried out respectively. While reducing the cement consumption, the utilization rate of solid waste such as tailings is increased, the filling cost is effectively saved, and the efficient recycling of solid waste is realized.

[0061] The following points need to be explained:

[0062] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0063] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0064] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0065] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A two-step segmented emptying and subsequent filling mining method for an underground stope goaf, comprising a stope, a chute, a chute connecting road, a segmented connecting road, a segmented tunnel and a drainage and ventilation shaft for pedestrians, It is characterized in that The steps include: S1. Segment the stope along the direction of the ore body, alternately arrange the first-step stope and the second-step stope, and the width of the first-step stope and the width of the second-step stope are consistent with the thickness of the ore body; S2, stope preparation and cutting engineering layout; Among them, the segmented roadway is connected with each segmented stope, and the segmented roadway enters the corresponding segmented stope through the segmented connecting road. The chute and the chute are connected for mining, and the pedestrian drainage ventilation skylight is used for drainage. The end of the stope is entered through the rock drilling mine exit roadway, and a cutting well is constructed upward from the end of the stope to form an initial blasting space; S3, mining and filling the stope; Among them, following the bottom-up mining rule, the initial blasting space is blasted in sequence according to the order of mining withdrawal, the mine is unloaded to the chute by a scraper, and graded tailings are used for filling. The one-step mining area and the two-step mining area are alternately filled in the mining area.

2. The two-step segmented emptying and subsequent filling mining method of the underground stope goaf according to claim 1, It is characterized in that The filling using graded tailings includes: High-strength filling bodies are used to fill the 6m height range at the bottom of the first mining section of any middle section of the mining field, and the mining field is alternately filled with low-strength filling bodies and micro-cemented filling bodies. High-strength filling bodies are used to fill the 50cm range at the top of the section.

3. The two-step segmented emptying and subsequent filling mining method of the underground stope goaf according to claim 2, It is characterized in that The alternate filling of the one-step stope and the two-step stope in the stope includes: The first-step stope is filled with low-strength filling material; In the second step, the stope is filled with micro-cemented filling material.

4. The two-step segmented emptying and subsequent filling mining method of underground stope goaf according to claim 2, It is characterized in that The first mining section includes: the bottom of the middle section, the stope in the first mining section and the top of the middle section arranged from bottom to top; The bottom of the middle section is 6m high; The stopes in the first mining segment include: a one-step stope and a two-step stope that are alternately arranged horizontally; The top of the middle section is 50 cm high.

5. The upward segmented empty pit and subsequent filling mining method according to claim 3, It is characterized in that The lime-sand ratio of the high-strength filler is 1:4; The lime-sand ratio of the low-strength filling body is 1:10; The lime-sand ratio of the micro-cemented filling body is 1:20.

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