Radial panel upward stage mining method for deep thick and large ore body

Abstract

The invention provides a deep thick and large ore body radial panel upward stage mining method, and belongs to the field of mining, the ore body is divided into panels along the trend, a central courtyard is arranged in the center of the panel hanging panel, and the ore body is divided into a plurality of fan-shaped panels with equal angles by taking the central courtyard as the circle center; dividing the fan-shaped panel into an inner ring stope and an outer ring stope, and numbering the inner ring stope and the outer ring stope in sequence; an opposite angle jump mining mode is adopted, and the inner ring odd stopes, the outer ring even stopes, the inner ring even stopes and the outer ring odd stopes are stoped in sequence; and filling is conducted through the pre-buried filling pipeline system after each step of stoping is completed, and the next step of stoping is conducted after a filling body reaches the preset strength till the whole-stage ore body stoping is completed. By means of radial panel arrangement, annular upward mining, filling pipeline pre-burying and the like, the requirement for mine productivity can be met, directional regulation and control of a stress field can be achieved, the rockburst risk is reduced, and the economic benefit of a mine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep mining of metal mines, and particularly relates to a deep thick ore body radial panel uplink type stage mining method. BACKGROUND

[0002] With the development of metal and non-metal mine exploitation to the deep, the problems of rock burst risk, large deformation of surrounding rock and thermal disaster caused by high ground stress environment are increasingly prominent, which has become a key bottleneck restricting safe and efficient mining. The measured data shows that in a copper mine with a depth of 1050m, the vertical stress peak value reaches 35MPa, which is 1.8 times of the self-weight stress, directly leading to the stress concentration coefficient of the traditional mining method of the ore pillar exceeding 2.5. According to statistics, 78% of rock burst events in deep mines occur in the stoping disturbance area, reflecting the insufficient adaptability of the existing stope structure to the high stress environment.

[0003] In the existing mining method, the rectangular ore pillar arrangement requires a width-height ratio of 0.6 or more to maintain stability, but causes a high permanent ore loss rate of 25%-40%; the diamond ore pillar scheme improves the stress distribution, but the complex stope structure leads to a sharp increase in construction precision; the sublevel filling method has a long mining and filling cycle due to the sublevel height of only 3-4 meters; the downward drift type uses cemented filling body as the roof to improve safety, but has low mining intensity and high cost; the sublevel open stope and subsequent filling method can improve the mining intensity, but when the stage height exceeds 50 meters, the roof displacement is large in the environment with a depth of 800 meters or more, and the risk of caving is uncontrollable; the panel mechanized filling method improves the operation efficiency, but the rectangular panel layout still increases the amount of ore pillar left, and rock burst frequently occurs in the right-angle stress concentration area.

[0004] In summary, the existing deep mining method has the following three common structural defects: first, continuous stoping disturbance leads to significant stress superposition effect; second, systematic absence of blasting free face; and third, the filling system is fragmented, and the operation cost is high.

[0005] Therefore, it is necessary to design a deep thick ore body radial panel uplink type stage mining method to solve the above problems. SUMMARY

[0006] In view of the technical problems in the background art, the present application provides a deep thick ore body radial panel uplink type stage mining method, which aims to solve the technical problems of large amount of ore pillar left, poor stability of stope, and insufficient blasting compensation space in high stress environment.

[0007] The present application provides a deep thick ore body radial panel uplink type stage mining method, which comprises the following steps: S1. Dividing the ore body along the strike into panels, setting a central raise in the center of the panel, and dividing the ore body into several equiangular fan-shaped panels with the central raise as the center; S2. Dividing the fan-shaped panels into inner ring stope and outer ring stope, and numbering them in sequence; S3. Using diagonal skip mining mode, sequentially mining the inner ring odd stope, outer ring even stope, inner ring even stope, and outer ring odd stope; after each step of mining, filling is carried out through the pre-embedded filling pipe system, and after the filling body reaches the predetermined strength, the next step of mining is carried out, until the whole stage of ore body mining is completed.

[0008] As a further improvement of the present application, wedge-shaped ore pillars are left between the fan-shaped panels.

[0009] As a further improvement of the present application, the wedge-shaped ore pillars are isosceles trapezoidal in horizontal plane, with top width W1=0.15H and bottom width W2=W1xtan(90°-α), wherein H is the middle section height, and α is the angle of the fan-shaped panel.

[0010] As a further improvement of the present application, a ring-shaped cutting roadway and an isolation retaining wall are provided between the inner ring stope and the outer ring stope.

[0011] As a further improvement of the present application, a radial cutting raise is provided upwardly in the ring-shaped cutting roadway, and the outer ring stope forms a blasting free surface through the ring-shaped cutting roadway and the radial cutting raise.

[0012] As a further improvement of the present application, the inner ring even stope forms a blasting free surface by using filling body interface pre-splitting blasting mode.

[0013] As a further improvement of the present application, the filling pipe system includes a surface filling station, a vertical drill hole, a middle section ring-shaped main pipe, an ore pillar pre-embedded sleeve, and a stope hose.

[0014] As a further improvement of the present application, the 28-day strength of the filling body is ≥2MPa.

[0015] As a further improvement of the present application, after blasting, a backward ore drawing mode from the outside of the panel to the central raise is used for ore drawing.

[0016] As a further improvement of the present application, the ore body has a burial depth >800m and a thickness >50m.

[0017] The beneficial effects of the present application are: The application provides an uplink type stage mining method for a deep thick ore body radial panel, the ore body is divided into panels along the strike, a central raise is arranged at the center of the panel, the ore body is divided into a plurality of equal-angle fan-shaped panels with the central raise as the center; the fan-shaped panel is divided into an inner ring stope and an outer ring stope, and is numbered in sequence; a diagonal skip mining mode is adopted, and the inner ring odd stope, the outer ring even stope, the inner ring even stope and the outer ring odd stope are sequentially mined; after each step of mining, filling is performed through a pre-buried filling pipeline system, and the next step of mining is performed after the filling body reaches a predetermined strength, and the whole stage ore body is mined until the whole stage ore body is mined. By means of arranging a radial panel, ring uplink mining, segmented drilling-stage differential caving, pre-excavating a ring cutting roadway, a radial cutting raise, filling body interface pre-splitting blasting and pre-buried filling pipeline setting, not only the demand of mine production capacity can be met, but also the stress field can be directionally controlled, the rock burst risk is reduced, and the economic benefit of the mine is improved.

[0018] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following will specifically describe the embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the application, the drawings used in the application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0020] Figure 1 It is a mining preparation engineering layout diagram of a deep thick ore body radial panel in the embodiment of the application; Figure 2 It is a stope division schematic diagram in the embodiment of the application; Figure 3 It is a stope mining sequence schematic diagram in the embodiment of the application; Explanation of reference numerals: 1, central raise; 2, vein outside roadway; 3, vein outside connecting road; 4, drilling roadway; 5, wedge-shaped ore pillar; 6, ring cutting roadway; 7, isolation retaining wall; 801, first inner ring stope; 802, second inner ring stope; 803, third inner ring stope; 804, fourth inner ring stope; 805, fifth inner ring stope; 806, sixth inner ring stope; 901, first outer ring stope; 902, second outer ring stope; 903, third outer ring stope; 904, fourth outer ring stope; 905, fifth outer ring stope; 906, sixth outer ring stope. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Use of the term "about" in relation to a geographic location refers to a location within a 10 km radius of the geographic location.

[0023] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. Those skilled in the art will recognize that the embodiments described herein can be combined with one another.

[0024] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0025] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0026] The current mining technology faces the following core contradictions: the geometric contradiction between the excessive amount of pillar setting and the optimization of stress distribution, the time sequence contradiction between the disturbance accumulation induced by continuous mining and the efficiency reduction of interval mining, and the system contradiction of blocking the pipeline and blasting channel after the filling body seals the mining area. These bottlenecks seriously restrict the economic recoverability of deep resources, and it is urgent to realize the mining goal of safety, efficiency and low loss through innovative mining methods.

[0027] In order to solve the technical problems of large amount of pillar setting, poor stability of stope and insufficient blasting compensation space in high stress environment, the application provides a kind of deep thick ore body radial panel uplink type stage mining method, wherein, by optimizing the stope geometry and the recovery timing, the technical effects of significantly reducing the amount of pillar setting, improving the overall stability of the stope, optimizing the layout of the blasting compensation space, and realizing the efficient and safe recovery can be achieved.

[0028] Please refer to Figure 1 The application embodiment provides a kind of deep thick ore body radial panel uplink type stage mining method, comprising the following steps: S1. divide the ore body along the strike into panels, set a central raise 1 in the center of the panel, and divide the ore body into several equal-angle fan-shaped panels with the central raise 1 as the center; S2. divide the fan-shaped panel into inner ring stope and outer ring stope, and number them in order; S3. adopt diagonal skip mining mode, recover inner ring odd-numbered stope, outer ring even-numbered stope, inner ring even-numbered stope and outer ring odd-numbered stope in turn; after each step of recovery, filling is carried out through the pre-buried filling pipe system, and the next step of recovery is carried out after the filling body reaches the predetermined strength, until the whole stage of ore body recovery is completed.

[0029] In the technical scheme of the embodiment of the present application, a ring-shaped panel arrangement is adopted to reduce the stress concentration phenomenon formed by the rectangular arrangement stope, and the ring-shaped arrangement can effectively regulate and control the stress distribution in the recovery process, which plays an important role in the deep well high stress stope. Through the coordinated optimization of the geometric structure and the recovery sequence, the technical problems such as large amount of pillar setting, poor stability of stope, insufficient blasting compensation space and the like in the high stress environment are effectively alleviated. The method divides the ore body along the strike into a plurality of equal-angle fan-shaped panel areas, and implements diagonal skip mining in the combination mode of inner and outer ring stope, and forms an orderly and stable recovery system in combination with the filling body and timely support. The panel area is divided radially with the central raise 1 as the center, so that the stope arrangement is more reasonable, the stress distribution is more uniform, the amount of pillar setting is significantly reduced, and the recovery rate of the ore body is improved; the diagonal skip mining mode is adopted, and the inner ring odd, outer ring even, inner ring even and outer ring odd are sequentially alternated in recovery, so that the stress concentration and disturbance accumulation caused by continuous recovery are effectively avoided, and the overall stability of the stope is improved; the filling is carried out immediately after each recovery through the pre-buried filling pipeline system, and the next operation is carried out after the filling body reaches the predetermined strength, which not only ensures the stability of the stope surrounding rock, but also provides a reasonable compensation space for subsequent blasting, and solves the problem of pipeline and blasting passage blockage after the filling body closes the mining area. Specifically, the vein outside engineering of the present application includes a ramp, a main transportation roadway, a segmented transportation roadway, a main chute and the like, and the arrangement of these engineering is similar to the conventional segmented filling method or the segmented open stope subsequent filling method; compared with the traditional mining preparation engineering arrangement, the difference of the present application lies in that the vein outside connecting channel 3 connected with the vein outside roadway 2 adopts a ring-shaped arrangement around the ore body, and the vein outside connecting channel 3 opens towards the central raise 1 to excavate the drilling roadway 4.

[0030] Further, in some embodiments, a wedge-shaped pillar 5 is arranged between the fan-shaped panel areas. The wedge-shaped pillar 5 is isosceles trapezoidal in the horizontal plane, with a top width W1 = 0.15H and a bottom width W2 = W1 x tan(90°-α), wherein H is the middle section height, and α is the fan-shaped panel angle.

[0031] In the technical scheme of the embodiment of the present application, the wedge-shaped pillar 5 forms a support structure between the stopes, which can effectively disperse and transmit high stress, and avoid the instability of the pillar or the roof collapse caused by stress concentration. The top width is proportional to the middle section height, and the bottom width is adjusted with the fan-shaped angle, so that the pillar forms a reasonable support gradient in the horizontal direction, and adapts to the stress field change in the radial panel structure. Compared with the traditional rectangular pillar, the wedge-shaped pillar 5 reduces unnecessary pillar volume under the premise of ensuring support strength, thereby improving the resource recovery rate.

[0032] Further, in some embodiments, a ring-shaped cutting roadway 6 and a separation retaining wall 7 are arranged between the inner ring stope and the outer ring stope.

[0033] In the technical scheme of the embodiment of the present application, the ore body is divided into inner ring and outer ring stope through the annular cutting roadway 6, which facilitates mining in stages and regions, improves mining efficiency, and effectively releases stress around the stope, reduces the risk of rock mass damage or collapse caused by stress concentration; the isolation retaining wall 7 is constructed by high-strength materials to form a physical barrier, support the stope surrounding rock, prevent rock mass instability, effectively isolate the inner and outer ring stope, reduce the disturbance of the mined-out area to the unmined area, and ensure the safety of subsequent mining operations. The combination of the annular cutting roadway 6 and the isolation retaining wall 7 not only optimizes the structural layout of the stope, but also significantly improves the safety and economy of ore body mining.

[0034] Further, in some embodiments, a radial cutting raise is arranged upwardly in the annular cutting roadway 6, and the outer ring stope forms a blasting free surface through the annular cutting roadway 6 and the radial cutting raise.

[0035] In the technical scheme of the embodiment of the present application, the radial cutting raise provides necessary compensation space for subsequent large-scale blasting, reduces blasting resistance, and improves explosive energy utilization rate; the combination of the annular cutting roadway 6 and the radial cutting raise forms a three-dimensional cross free surface network, so that the rock mass can expand in multiple directions during blasting, significantly improving the blasting efficiency.

[0036] Further, in some embodiments, the inner ring even stope adopts a filling body interface presplitting blasting method to form a blasting free surface.

[0037] In the technical scheme of the embodiment of the present application, presplitting blasting can effectively avoid blasting energy dissipation, provide a good compensation space for subsequent main blasting, ensure blasting effect, weaken the disturbance of main blasting to the filling body and surrounding rock by forming cracks in advance, which is conducive to maintaining the stability of the stope structure and optimizing the blasting efficiency.

[0038] Further, in some embodiments, the filling pipe system includes a surface filling station, a vertical drill hole, a middle segment annular main pipe, a mine pillar pre-buried sleeve, and a stope hose.

[0039] In the technical scheme of the embodiment of the present application, the filling pipe system realizes efficient conveying and precise distribution of filling materials through the synergistic effect of the surface filling station, the vertical drill hole, the middle segment annular main pipe, the mine pillar pre-buried sleeve, and the stope hose, which provides an important guarantee for safe and efficient mining of the mine.

[0040] Further, in some embodiments, the 28-day strength of the filling body is ≥2MPa.

[0041] In the technical scheme of the embodiment of the present application, the 28-day strength of the filling body is a key parameter for measuring its mechanical properties, which ensures that the filling body has sufficient bearing capacity and stability in the mined-out area and provides safety protection for subsequent mining.

[0042] Furthermore, in some embodiments, after blasting, ore is extracted using a retreating ore extraction method from the outside of the panel towards the central well 1.

[0043] In the technical solution of this application embodiment, the use of retreating ore extraction can effectively reduce the impact of ground pressure during the mining process and reduce disturbance to the surrounding rock, thereby improving the overall efficiency and safety of mining.

[0044] Furthermore, in some embodiments, the ore body has a burial depth of >800m and a thickness of >50m.

[0045] In the technical solution of this application embodiment, for ore bodies with a burial depth greater than 800 meters and a thickness greater than 50 meters, the stress field is controlled by optimizing the mining structure, mining sequence and backfilling process, so as to achieve the purpose of controlling ground pressure and realizing safe and efficient mining.

[0046] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific technologies or conditions are not specified in the embodiments, they shall be performed in accordance with the technologies or conditions described in the literature in this field or in accordance with the product manual.

[0047] Example This embodiment provides a method for upward-moving staged mining of radial panels in deep, thick ore bodies, including the following steps: S1. As Figure 1 As shown, a ring-shaped panel layout is adopted, with a ore body thickness of 60m. The ore body is divided into a large panel with a strike length of 120m. A central well 1 is set in the center of the upper panel. With the central well 1 as the center, the horizontal projection of the ore body is divided into six equal-angled sector panels. The central angle of each sector panel is 30°. Wedge-shaped pillars 5 are left between the sector panels. The wedge-shaped pillars 5 are isosceles trapezoids in the horizontal plane. In the section perpendicular to the dip of the ore body, the two sides of the wedge-shaped pillars 5 are parallel to the ore layer to form a parallelogram. The construction positioning roadway is radiated from the center to the boundary of the ore body through precise layout using a total station to form the panel division baseline. S2. For example Figure 2 As shown, the sector-shaped panel is divided into an inner ring stope and an outer ring stope. A ring-shaped cutting roadway 6 and an isolation wall 7 are set between the inner ring stope and the outer ring stope. Radial cutting wells are set upwards from the ring-shaped cutting roadway 6, with a spacing of 20m. The inner ring stopes are numbered sequentially as the first inner ring stope 801, the second inner ring stope 802, the third inner ring stope 803, the fourth inner ring stope 804, the fifth inner ring stope 805, and the sixth inner ring stope 806. The outer ring stopes are numbered as the first outer ring stope 901, the second outer ring stope 902, the third outer ring stope 903, the fourth outer ring stope 904, the fifth outer ring stope 905, and the sixth outer ring stope 906. S3. The vein outside connecting channel 3 is arranged in a ring shape around the ore body, and a rock drilling roadway 4 is excavated at the opening of the vein outside connecting channel 3 towards the central open mine 1; during mining, a diagonal skip mining mode is adopted, and stress blocking is performed in space and time, as shown in the figure, and the specific mining sequence is as follows: Figure 3 S31. First, the inner ring odd stope (the first inner ring stope 801, the third inner ring stope 803, and the fifth inner ring stope 805) is mined, and after the mining is completed, pre-embedded filling pipes are used for timely filling, and when the 28-day strength of the filling body is greater than or equal to 2 MPa, the next step of mining is performed; S32. The outer ring even stope (the second outer ring stope 902, the fourth outer ring stope 904, and the sixth outer ring stope 906) is mined, which is spatially staggered with step S31, and after the mining is completed, pre-embedded filling pipes are used for timely filling, and when the 28-day strength of the filling body is greater than or equal to 2 MPa, the next step of mining is performed; S33. The inner ring even stope (the second inner ring stope 802, the fourth inner ring stope 804, and the sixth inner ring stope 806) is mined, and the filling body on both sides ensures the safety of mining, and at the same time, the inner ring wedge-shaped ore pillar 5 can be partially recovered, and after the mining is completed, pre-embedded filling pipes are used for timely filling, and when the 28-day strength of the filling body is greater than or equal to 2 MPa, the next step of mining is performed; S34. The outer ring odd stope (the first outer ring stope 901, the third outer ring stope 903, and the fifth outer ring stope 905) is mined, and at the same time, part of the isolation retaining wall 7 is recovered, and thus the entire sublevel mining is completed, and the entire stage ore body mining is performed; After blasting, a shovel-truck is used to retreat from the outside of the panel to the central open mine 1 for ore removal.

[0048] Compared with the traditional rectangular ore pillar arrangement, the present application has the following significant advantages: 1. Stress concentration coefficient is reduced: the stress concentration coefficient of the traditional method is greater than or equal to 2.5, and the present application can reduce the stress concentration coefficient to less than or equal to 1.6 through radial arrangement and skip mining timing control; 2. Rock burst event occurrence rate is reduced: the mining disturbance is spatially staggered and dispersed by the ring-shaped cutting free surface “pressure relief”, and the rock burst occurrence rate is reduced from the high-risk condition commonly seen in deep mining to less than 8%, and the rock burst energy level is reduced by 1-2 levels; 3. Roof displacement control: under the condition of a stage height greater than 50 m, the roof displacement is reduced from greater than or equal to 200 mm in the traditional method to less than or equal to 60 mm, and the displacement peak value of adjacent stope is obviously staggered; 4. Ore loss rate is reduced: the wedge-shaped ore pillar is left and “filling-secondary recovery” is implemented, and the ore loss rate is less than or equal to 12% and the dilution rate is less than or equal to 10%, which is significantly lower than the general ore loss rate of 25-40% in the traditional arrangement; ​5、Pillar setting amount is reduced: Compared with the traditional isosceles trapezoidal (parallelogram) setting method, the radial / circular division makes the pillar ratio of the panel decrease from 30-40% to 12-18%, and the recovery rate increases by 8-15 percentage points; 6、Free surface is sufficient, and cutting engineering quantity is obviously reduced: The pre-excavation of circular cutting roadway + radial cutting raise (about 20m interval) forms a continuous free surface, and the unit ore cutting ratio decreases from about 35m 3 / kt to 22-25m 3 / kt; 7、Shorter mining and filling cycle: Diagonal skip mining and pre-splitting-filling-recovery method, the mining and filling cycle is shortened by 20-30%, and the single stope construction period can be shortened by 10-15 days; 8、Reduced operating costs: The three-dimensional pipe network of "surface station-vertical shaft-middle section ring pipe-pillar casing pipe-stope hose" is pre-set once, and the outer ring / subsequent stope does not need to rebuild the transportation system, saving about 600-1200 thousand yuan of system improvement / expansion construction and production loss per panel; 9、Smooth ore mining and ventilation organization: The back-type ore mining of the shovel-truck is from the outside to the inside, the central raise collection reduces the transportation and cross operation, and the direct mining and transportation cost decreases by 3-6%, and the personnel exposure time is reduced; 10、Significant comprehensive benefits: Under the joint action of improved recovery rate and shortened cycle, the annual production capacity of the panel is increased by about 10-20%; considering the cutting, ventilation / pipeline and maintenance expenses, the comprehensive cost of unit ore is reduced by about 8-15%.

[0049] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications of the embodiments that can be thought of by those skilled in the art, and other ways constructed by combining part of the components of the embodiments are also included in the scope of the present application.

Claims

1. A top-down block caving method for a deep, thick ore body, characterized in that, The method comprises the following steps: S1. Dividing the ore body along the strike into sectors, setting a central raise in the center of each sector, and dividing the ore body into several equal-angle sectors with the central raise as the center; S2. Dividing the sectors into inner and outer ring stope and numbering them in sequence; S3. Using diagonal skip mining mode to sequentially extract the inner ring odd stope, outer ring even stope, inner ring even stope, and outer ring odd stope; after each step of extraction, filling is performed through the pre-embedded filling pipe system, and after the filling body reaches the predetermined strength, the next step of extraction is performed, until the whole stage of ore body extraction is completed.

2. The top down bench and shrinkage method of mining of deep thick ore bodies of claim 1, wherein, Wedge-shaped ore pillars are left between the sectors.

3. The top down, bench and shrinkage method of mining of a deep thick ore body as claimed in claim 2, wherein, The wedge-shaped ore pillars are isosceles trapezoids in the horizontal plane, with a top width W1 = 0.15H and a bottom width W2 = W1 x tan(90°-α), wherein H is the height of the middle section, and α is the sector angle.

4. The top down bench and shrinkage method of mining steeply dipping, thick, large ore bodies of claim 1, wherein, An annular cutting roadway and an isolation retaining wall are provided between the inner ring stope and the outer ring stope.

5. The top down, block caving method of claim 4, wherein, Radiating cutting raises are provided upward in the annular cutting roadway, and the outer ring stope forms a blasting free surface through the annular cutting roadway and the radiating cutting raises.

6. The radial panel upward progression method of mining for deep thick and large ore bodies as claimed in claim 1, wherein, The inner ring even stope forms a blasting free surface using a filling body interface pre-splitting blasting method.

7. The radial panel upward progression method of mining for deep thick and large ore bodies as claimed in claim 1, wherein, The filling pipe system comprises a surface filling station, a vertical drill hole, a middle section annular main pipe, an ore pillar pre-embedded sleeve, and a stope hose.

8. The radial panel upward progression method of mining for deep thick and large ore bodies as claimed in claim 1, wherein, The 28-day strength of the filling body is ≥2MPa.

9. The radial panel upward progression method of mining for deep thick and large ore bodies as claimed in claim 1, wherein, Retreating mining from the outside of the sector to the central raise is used after blasting.

10. The radial panel upward progression method of mining for deep thick and large ore bodies as claimed in claim 1, wherein, The buried depth of the ore body is >800m, and the thickness is >50m.

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