A method for determining the minimum width of a stage open stope followed by backfilling

Abstract

The application discloses a kind of stage empty field subsequent filling stope minimum width determination method, the stage empty field subsequent filling stope minimum width determination method proposed in the application proposes a kind of scheme capable of determining stope width minimum value, to solve the problem that the scheme for determining the selection of stope width minimum value is lacked at present;The present application makes up the existing stope width determination method only gives the maximum allowable width of stope, and does not fully consider the problems caused by the too small stope width in the actual operation process, such as the destruction of the approach brow line, the difficulty of filling retaining wall construction, etc.The present application proposes a method for determining the minimum width of stope based on comprehensive consideration of factors such as actual mining operation, filling retaining wall construction, bottom structure setting, etc., thereby providing engineering constraints for determining appropriate stope width, and has strong popularization value and application reference.

Description

Technical Field

[0001] This invention relates to the field of underground mine backfilling technology, specifically to a method for determining the minimum width of a staged open stope for subsequent backfilling. Background Technology

[0002] In the implementation of the staged open-cut subsequent backfill mining method, the width of the stope is a key technical indicator affecting the safety and economy of mining operations. Generally, in the preliminary design stage of the mine, the appropriate width of the stope is determined through theoretical calculations, numerical simulations, engineering analogies, and field industrial tests, based on geological conditions such as ore body occurrence and rock stability.

[0003] However, since a smaller stope width results in higher safety, the stope width determined by the above methods is often taken as the maximum value. In other words, there is currently no scheme to determine the minimum value of the stope width.

[0004] According to mining engineering practice, an excessively narrow stope not only increases the workload of preparatory cutting and may lead to increased mining costs, but also causes a series of engineering problems such as damage to the ore access road, insufficient length of access road for laying backfill retaining walls after ore extraction, and difficulty in sealing the access road. Summary of the Invention

[0005] The main objective of this invention is to provide a method for determining the minimum width of a stope after staged open-cut filling, aiming to solve the problem of the current lack of a scheme for determining the minimum value of the stope width.

[0006] The technical solution proposed in this invention is as follows:

[0007] A method for determining the minimum width of a staged open stope followed by filling, comprising:

[0008] Based on the ore extraction situation of the mine, the angle between the mine roadway and the ore extraction route is determined, and the length of the mine eyebrow protection line and the distance of the straight section of the route are calculated accordingly, and the final minimum ore extraction route length is determined.

[0009] Based on different layouts of mine roadways, models of single-entry double-sided ore extraction stopes and bottom structures, as well as single-entry single-sided ore extraction stopes and bottom structures, are constructed. The minimum width of the first stop is calculated based on the single-entry double-sided ore extraction stopes and bottom structures and the angle between the roadway and the ore extraction roadway. The minimum width of the second stop is calculated based on the single-entry single-sided ore extraction stopes and bottom structures, the length of the mine eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the ore extraction roadway.

[0010] The larger of the minimum width of the first mining area and the minimum width of the second mining area is taken as the final minimum width of the mining area.

[0011] Preferably, the step of determining the angle between the mine roadway and the ore extraction route based on the mine's ore extraction conditions, and using this angle to calculate the length of the mine embankment protection line and the distance of the straight section of the route, and determining the final minimum ore extraction route length, includes:

[0012] Based on the mine's ore extraction conditions, the maximum collapse height of the triangular pillar, the angle between the roadway and the ore extraction route, the blast hole angles of the V-shaped trench, the turning radius of the loader, and the loader's shoveling distance are determined. Based on these, the length of the mine eyebrow protection line, the straight section distance of the route, and the straight length of the curved section from the ore extraction roadway to the ore extraction route are calculated. Based on these, the minimum ore extraction route length that meets the requirements of the loader is calculated.

[0013] Preferably, the formula for calculating the length of the mine eyebrow protection line is:

[0014] l1 = h / tanβ,

[0015] In the formula, l1 is the protection length of the mine eyebrow line; h is the maximum collapse height of the triangular mine pillar; β is the blast hole angle of the V-shaped trench;

[0016] The formula for calculating the distance of the straight segment of the route is:

[0017] l2=d c ,

[0018] In the formula, l2 is the distance of the straight section of the route; d c This refers to the shoveling distance of the loader;

[0019] The formula for calculating the straight length of the curved section from the ore extraction roadway to the ore extraction access road is as follows:

[0020] l3=r(1-cosα),

[0021] In the formula, l3 is the straight length of the curved section from the ore exit roadway to the ore exit access road; r is the turning radius of the loader; and α is the angle between the roadway and the ore exit access road.

[0022] Preferably, the formula for calculating the minimum ore outlet access length that meets the requirements of the loader is:

[0023] L1 = l1 + l2 + l3,

[0024] In the formula, L1 is the minimum ore exit path length that meets the requirements of the loader.

[0025] Preferably, the step of determining the angle between the mine roadway and the ore extraction route based on the mine's ore extraction conditions, and using this angle to calculate the length of the mine embankment protection line and the distance of the straight section of the route, and determining the final minimum ore extraction route length, further includes:

[0026] Based on the actual filling scheme of the mine, determine the distance from the filling retaining wall to the sidewall of the goaf and the distance from the filling retaining wall to the bend point, and calculate the minimum ore access length that meets the construction requirements of the filling retaining wall.

[0027] The larger of the minimum ore extraction route length required to meet the requirements of the loader and the minimum ore extraction route length required to meet the requirements of the filling retaining wall construction shall be taken as the final minimum ore extraction route length.

[0028] Preferably, the formula for calculating the minimum ore access length that meets the requirements for constructing the filling retaining wall is:

[0029] L2 = l1 + l3 + d d +d w ,

[0030] In the formula, L2 is the minimum length of the ore access road that meets the requirements for constructing the filling retaining wall; d d d is the distance from the retaining wall to the sidewall of the goaf. w This refers to the distance from the retaining wall to the bend in the road.

[0031] Preferably, based on different layouts of mine roadways, a single-entry double-sided ore extraction stope and bottom structure model, and a single-entry single-sided ore extraction stope and bottom structure model are constructed respectively. The minimum width of the corresponding first stope is calculated based on the single-entry double-sided ore extraction stope and bottom structure model and the angle between the roadway and the ore extraction roadway. The minimum width of the corresponding second stope is calculated based on the single-entry single-sided ore extraction stope and bottom structure model, the length of the mine eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the ore extraction roadway. This includes:

[0032] When the bottom structure of the mine adopts the ore extraction roadway located at the junction of the stope and pillar, and the ore is extracted through the single access roadway of the two-sided stope, a single access roadway double-sided ore extraction stope and bottom structure model are constructed.

[0033] Based on the single-entry double-sided ore-exit stope and bottom structure model, the width of the V-shaped trench and the width of the inter-pillar of the V-shaped trench are determined, and the minimum width of the first stope is calculated based on the angle between the trench and the ore-exit entrance.

[0034] Preferably, based on different layouts of mine roadways, a single-entry double-sided ore extraction stope and bottom structure model, and a single-entry single-sided ore extraction stope and bottom structure model are constructed respectively. The minimum width of the corresponding first stope is calculated based on the single-entry double-sided ore extraction stope and bottom structure model and the angle between the roadway and the ore extraction roadway. The minimum width of the corresponding second stope is calculated based on the single-entry single-sided ore extraction stope and bottom structure model, the length of the mine eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the ore extraction roadway. This includes:

[0035] When the bottom structure adopts a single-entry, single-sided ore extraction layout with the ore extraction roadway located on one side of the stope or pillar, construct a single-entry, single-sided ore extraction stope and bottom structure model.

[0036] The width between the ore extraction roadway and the trench roadway is determined based on the single-entry, single-side ore extraction stope and the bottom structure model. The minimum width of the second stope is calculated based on the single-entry, single-side ore extraction stope and the bottom structure model, the length of the ore eyebrow protection line, the distance of the straight section of the access roadway, and the angle between the roadway and the ore extraction access roadway.

[0037] Preferably, the formula for calculating the minimum width of the first mining area is:

[0038] B1 = c / 2 + 3b / 2 + L c cosα,

[0039] In the formula, B1 is the minimum width of the first stope; c is the width of the pillars in the V-shaped trench; b is the width of the roadway in the V-shaped trench; α is the angle between the roadway and the ore exit route; L c This represents the final minimum ore exit route length.

[0040] Preferably, the formula for calculating the minimum width of the second mining area is:

[0041] B2=(l1+l2+L c cosα+2b+d) / 2,

[0042] In the formula, B2 is the minimum width of the second stope; l1 is the protection length of the mine embankment line; l2 is the straight section distance of the access road; α is the angle between the roadway and the ore exit roadway; b is the width of the V-shaped trench; d is the width between the ore exit roadway and the trench roadway; L c This represents the final minimum ore exit route length.

[0043] The above technical solution can achieve the following beneficial effects:

[0044] This invention proposes a method for determining the minimum width of a stope after subsequent backfilling in a staged open area. This method provides a solution to the current lack of a method for determining the minimum stope width. Furthermore, this application addresses the shortcomings of existing stope width determination methods, which only provide the maximum allowable width without fully considering the problems of insufficient stope width leading to damage to the access ridge and difficulties in constructing backfill retaining walls during actual operation. Based on a comprehensive consideration of factors such as actual on-site ore extraction operations, backfill retaining wall construction, and bottom structure design, this invention proposes a method for determining the minimum stope width, thus providing engineering constraints for determining a suitable stope width and possessing strong promotional value and application reference. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0046] Figure 1 This is a flowchart of the first embodiment of the method for determining the minimum width of a staged open area followed by filling in the mining area proposed in this invention;

[0047] Figure 2 This is a schematic diagram of the ore extraction route of the loader in a method for determining the minimum width of a staged open stope followed by filling, as proposed in this invention.

[0048] Figure 3 This is a top view schematic diagram of the construction of the filling retaining wall in the method for determining the minimum width of the subsequent filling of the staged open area proposed in this invention;

[0049] Figure 4 This is a front view of the single-entry double-sided ore-exiting stope and bottom structure model in the method for determining the minimum width of a staged open stope followed by filling proposed in this invention.

[0050] Figure 5 This is a front view of the single-entry, single-side ore-exiting stope and bottom structure model in the method for determining the minimum width of a staged open stope followed by filling, as proposed in this invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] The map is labeled as follows: 1. V-shaped trench; 2. Trench roadway; 3. Mine exit roadway; 4. Mine exit access road. Detailed Implementation

[0053] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0054] This invention proposes a method for determining the minimum width of a staged open area followed by filling.

[0055] As attached Figure 1 As shown, in the first embodiment of the method for determining the minimum width of a staged open area followed by filling, proposed in this invention, this embodiment includes the following steps:

[0056] Step S110: Based on the mine's ore extraction situation, determine the angle α between the mine's roadway and the ore extraction route 4, and use this to calculate the mine embankment protection length l1 and the straight section distance l2 of the route; and determine the final minimum ore extraction route 4 length L. c .

[0057] Step S120: Based on different layouts of mine roadways, construct single-entry double-sided ore extraction stope and bottom structure models, as well as single-entry single-sided ore extraction stope and bottom structure models. Calculate the minimum width B1 of the first stope based on the single-entry double-sided ore extraction stope and bottom structure model and the angle α between the roadway and ore extraction roadway 4. Calculate the minimum width B2 of the second stope based on the single-entry single-sided ore extraction stope and bottom structure model, the mine eyebrow protection length l1, the straight section distance l2 of the roadway, and the angle α between the roadway and ore extraction roadway 4.

[0058] Step S130: Take the larger of the minimum width of the first stope and the minimum width of the second stope as the final minimum width B of the stope.

[0059] The specific calculation formula is: B = Max{B1, B2}.

[0060] This invention proposes a method for determining the minimum width of a stope after subsequent backfilling in a staged open area. This method provides a solution to the current lack of a method for determining the minimum stope width. Furthermore, this application addresses the shortcomings of existing stope width determination methods, which only provide the maximum allowable width without fully considering the problems of insufficient stope width leading to damage to the access ridge and difficulties in constructing backfill retaining walls during actual operation. Based on a comprehensive consideration of factors such as actual on-site ore extraction operations, backfill retaining wall construction, and bottom structure design, this invention proposes a method for determining the minimum stope width, thus providing engineering constraints for determining a suitable stope width and possessing strong promotional value and application reference.

[0061] In the second embodiment of the method for determining the minimum width of a staged open area followed by filling, based on the first embodiment, step S110 includes the following steps:

[0062] Step S210: Based on the mine's ore extraction conditions, determine the maximum collapse height h of the triangular pillar, the angle α between the roadway and the ore extraction route 4, the blast hole angle β of the V-shaped trench 1, the turning radius r of the loader, and the loader's shoveling distance d. c Based on this, the length of the mine eyebrow protection line l1, the distance of the straight section of the access road l2, and the straight length of the curved section from the mine exit roadway 3 to the mine exit access road 4 l3 are calculated, and the minimum length of the mine exit access road 4 that meets the requirements of the loader is calculated.

[0063] Specifically, the straight section distance l1 of the approach route is the shoveling distance d of the loader. c The determination is based on the specifications and model of the loader.

[0064] In the third embodiment of the method for determining the minimum width of a staged open stope followed by filling, based on the second embodiment, the calculation formula for the length of the mine eyebrow protection line is:

[0065] l1 = h / tanβ,

[0066] In the formula, l1 is the protection length of the mine eyebrow line; h is the maximum collapse height of the triangular mine pillar; β is the blast hole corner of the V-shaped trench 1.

[0067] The formula for calculating the distance of the straight segment of the route is:

[0068] l2=d c ,

[0069] In the formula, l2 is the distance of the straight section of the route; d c This refers to the shoveling distance of the loader;

[0070] The formula for calculating the straight length of the curved section from ore extraction roadway 3 to ore extraction access road 4 is as follows:

[0071] l3=r(1-cosα),

[0072] In the formula, l3 is the straight length of the curved section from ore roadway 3 to ore access road 4; r is the turning radius of the loader; and α is the angle between the roadway and the ore access road.

[0073] In the fourth embodiment of the method for determining the minimum width of a staged open stope followed by filling, the calculation formula for the minimum ore extraction path length 4 that meets the requirements of the loader, as described in the third embodiment, is as follows:

[0074] L1 = l1 + l2 + l3,

[0075] In the formula, L1 is the minimum length of the ore exit path 4 that meets the requirements of the loader.

[0076] In the fifth embodiment of the method for determining the minimum width of a staged open area followed by filling, based on the third embodiment, step S110 further includes the following steps:

[0077] Step S510: Determine the distance d from the backfill retaining wall to the sidewall of the goaf based on the actual backfilling plan of the mine. d and the distance d from the filling retaining wall to the bend point w And based on this, the minimum length L2 of the ore exit 4 that meets the requirements for the construction of the filling retaining wall is calculated.

[0078] Specifically, the distance d between the filling retaining wall and the sidewall of the goaf is... d Based on engineering experience, the distance should be no less than 2.5m; the distance d between the infill retaining wall and the bend point is... w Based on engineering experience, it should be no less than 1.5m.

[0079] Step S520: Take the larger of the minimum ore extraction path length L1 that meets the requirements of the loader and the minimum ore extraction path length L2 that meets the requirements of the filling retaining wall construction as the final minimum ore extraction path length L. c .

[0080] The specific calculation formula is: L c =Max{L1, L2}.

[0081] In the sixth embodiment of the method for determining the minimum width of a staged open stope followed by filling, based on the fifth embodiment, the calculation formula for the minimum ore access road length L2 that meets the requirements for constructing the filling retaining wall is as follows:

[0082] L2 = l1 + l3 + d d +d w ,

[0083] In the formula, L2 is the minimum length of the ore exit path 4 required to meet the construction requirements of the filling retaining wall; d d d is the distance from the retaining wall to the sidewall of the goaf. w This refers to the distance from the retaining wall to the bend in the road.

[0084] In the seventh embodiment of the method for determining the minimum width of a staged open area followed by filling, based on the fifth embodiment, step S120 includes the following steps:

[0085] Step S710: When the bottom structure of the mine adopts the ore extraction roadway 3 arranged at the junction of the stope and pillar, and the ore is extracted through the single access roadway 3 through the two side stopes, construct the single access roadway double side ore extraction stop and bottom structure model.

[0086] Step S720: Based on the single-entry double-sided ore-exit stope and bottom structure model, determine the roadway width b and the column width c of the V-shaped trench 1, and calculate the minimum width B1 of the first stope based on the included angle α between the roadway and the ore-exit access road 4.

[0087] Specifically, this means considering different layouts of mine roadways to determine the engineering scenarios when a single access road is arranged on one or both sides for ore extraction.

[0088] In the eighth embodiment of the method for determining the minimum width of a staged open area followed by filling, based on the seventh embodiment, step S120 further includes the following steps:

[0089] Step S810: When the bottom structure adopts the single-entry, single-sided ore extraction layout with the ore extraction roadway 3 located on one side of the stope or pillar, construct the single-entry, single-sided ore extraction stope and bottom structure model.

[0090] Step S820: Determine the width d between the ore extraction roadway 3 and the trench roadway 2 based on the single-entry single-side ore extraction stope and bottom structure model, and calculate the minimum width B2 of the second stope based on the single-entry single-side ore extraction stope and bottom structure model, the length of the ore eyebrow protection line l1, the distance of the straight section of the access road l2, and the angle α between the roadway and the ore extraction access road 4.

[0091] In the ninth embodiment of the method for determining the minimum width of a stope after staged open-cut filling proposed in this invention, based on the seventh embodiment, the calculation formula for the minimum width B1 of the first stope is as follows:

[0092] B1 = c / 2 + 3b / 2 + L c cosα,

[0093] In the formula, B1 is the minimum width of the first stope; c is the width of the pillars in the V-shaped trench 1; b is the width of the roadway in the V-shaped trench 1; α is the angle between the roadway and the ore exit route 4; L c The final minimum ore exit path length is 4.

[0094] In the tenth embodiment of the method for determining the minimum width of a stope after staged open-cut filling proposed in this invention, based on the eighth embodiment, the calculation formula for the minimum width B2 of the second stope is as follows:

[0095] B2=(l1+l2+L c cosα+2b+d) / 2,

[0096] In the formula, B2 is the minimum width of the second mining area; l1 is the protection length of the mine eyebrow line; l2 is the straight section distance of the access road; α is the angle between the roadway and the ore exit access road 4; b is the roadway width of the V-shaped trench 1; d is the width between the ore exit roadway 3 and the trench roadway 2; L c The final minimum ore exit path length is 4. Specific implementation examples:

[0098] (1) Based on the current mining conditions in the example, the maximum collapse height of the triangular pillar is determined to be h = 2m, the angle between the roadway and the mining access road 4 is α = 45°, the side angle of the blast hole of the V-shaped trench 1 is β = 50°, the turning radius of the loader is r = 6m, and the width of the mining access roadway 3 is d. h = 4.8m, ore exit access road width d j =4.8m and the shoveling distance d of the loader c =6m.

[0099] Therefore, the protection length of the mine eyebrow line, l1 = h / tanβ = 1.7m, and the straight section distance of the approach, l2 = d, are calculated respectively. c =6m, the straight length of the curved section from mine roadway 3 to mine access road 4 is l3 = r(1-cosα) = 2.5m, as shown in the attached figure. Figure 2As shown, the minimum length L1 of the ore exit path 4 that meets the requirements of the loader is then calculated as: L1 = l1 + l2 + l3 = 10.2m.

[0100] (2) Based on the actual filling scheme of the mine, determine the distance d between the filling retaining wall and the sidewall of the goaf. d =2.5m, distance d from the inflection point of the retaining wall to the curve. w =1.5m, therefore, the minimum length L2 of the ore exit road 4 that meets the requirements for constructing the filling retaining wall is: L2 = l1 + l3 + d d +d w =8.2m, as attached Figure 3 As shown.

[0101] (3) Take the maximum value between L1 and L2, which is the required minimum length L of the ore exit path 4. c =Max{L1, L2}=10.2m.

[0102] (4) When the bottom structure adopts the ore extraction roadway 3 located at the junction of the stope and pillar, and the ore is extracted through the single-entry roadway 3 through the two-sided stopes, construct a single-entry stope with double-sided ore extraction and bottom structure model (as shown in the attached model). Figure 4 The width of the V-shaped trench 1 is determined to be b = 4.8m, and the width of the pillars in the V-shaped trench 1 is determined to be c = 5.0m. Therefore, the minimum width of the mining area, B1, is calculated as: B1 = c / 2 + 3b / 2 + L c cosα = 16.9m.

[0103] (5) When the bottom structure adopts a single-entry, single-sided ore extraction layout with the ore extraction roadway 3 located on one side of the stope / pillar, construct a single-entry, single-sided ore extraction stope and bottom structure model (as shown in the attached model). Figure 5 The width d between ore roadway 3 and trench roadway 2 is determined to be 5.0m, and the minimum width B2 of the stope is then calculated: B2 = (l1 + l2 + L) c cosα+2b+d) / 2=14.8m.

[0104] (6) Take the maximum value of B1 and B2, which is the minimum width of the required mining area B = Max{B1, B2} = 16.9m.

[0105] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0106] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0107] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for determining the minimum width of a staged open stope followed by filling, characterized in that, include: Based on the ore extraction situation of the mine, the angle between the mine roadway and the ore extraction route is determined, and the length of the mine eyebrow protection line and the distance of the straight section of the route are calculated accordingly, and the final minimum ore extraction route length is determined. Based on different layouts of the mining roadways, models of single-entry double-sided mining stopes and bottom structures, as well as single-entry single-sided mining stopes and bottom structures, are constructed. The minimum width of the first stop is calculated based on the single-entry double-sided mining stopes and bottom structures and the angle between the roadway and the mining roadway. The minimum width of the second stop is calculated based on the single-entry single-sided mining stopes and bottom structures, the length of the mine eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the mining roadway. The larger of the minimum width of the first mining area and the minimum width of the second mining area shall be taken as the final minimum width of the mining area. Based on the mine's ore extraction conditions, the angle between the mine's roadways and the ore extraction route is determined. This angle is then used to calculate the length of the mine embankment protection line and the distance of the straight section of the route, ultimately determining the minimum ore extraction route length, including: Based on the mine's ore extraction conditions, the maximum collapse height of the triangular pillar, the angle between the roadway and the ore extraction route, the blast hole angle of the V-shaped trench, the turning radius of the loader, and the loader's shoveling distance are determined. Based on these, the length of the mine eyebrow protection line, the straight section distance of the route, and the straight length of the curved section from the ore extraction roadway to the ore extraction route are calculated. Based on these, the minimum ore extraction route length that meets the requirements of the loader is calculated. The formula for calculating the length of the mine eyebrow protection line is: l 1= h / tan β , In the formula, l 1 represents the length of the mine eyebrow protection line; h This represents the maximum collapse height of the triangular pillar. β The corner of the blast hole in the V-shaped trench; The formula for calculating the distance of the straight segment of the route is: l 2= d c ， In the formula, l 2 represents the distance of the straight section of the route; d c This refers to the shoveling distance of the loader; The formula for calculating the straight length of the curved section from the ore extraction roadway to the ore extraction access road is as follows: l 3 =r (1 - cos α ), In the formula, l 3 represents the straight-line length of the curved section from the ore exit roadway to the ore exit access road; r This refers to the turning radius of the loader; α It is the angle between the tunnel and the ore exit route.

2. The method for determining the minimum width of a staged open stope followed by filling as described in claim 1, characterized in that, The formula for calculating the minimum ore exit path length required to meet the requirements of the loader is as follows: L 1= l 1+ l 2 + l 3， In the formula, L 1. Minimum ore exit path length to meet the requirements of the loader.

3. The method for determining the minimum width of a staged open stope followed by filling as described in claim 1, characterized in that, Based on the mine's ore extraction conditions, the angle between the mine's roadways and the ore extraction route is determined, and the length of the mine embankment protection line and the distance of the straight section of the route are calculated accordingly. Finally, the minimum ore extraction route length is determined. This also includes: Based on the actual filling scheme of the mine, determine the distance from the filling retaining wall to the sidewall of the goaf and the distance from the filling retaining wall to the bend point, and calculate the minimum ore access length that meets the construction requirements of the filling retaining wall. The larger of the minimum ore extraction route length required to meet the requirements of the loader and the minimum ore extraction route length required to meet the requirements of the filling retaining wall construction shall be taken as the final minimum ore extraction route length.

4. The method for determining the minimum width of a staged open stope followed by filling as described in claim 3, characterized in that, The formula for calculating the minimum ore access length that meets the requirements for constructing a backfill retaining wall is as follows: L 2= l 1+ l 3 + d d + d w ， In the formula, L 2. Minimum ore access length to meet the construction requirements of the filling retaining wall; d d This refers to the distance from the retaining wall to the sidewall of the goaf. d w This refers to the distance from the retaining wall to the bend in the road.

5. The method for determining the minimum width of a staged open stope followed by filling, as described in claim 3, is characterized in that... Based on different layouts of the ore extraction roadways, models of single-entry double-sided ore extraction stopes and bottom structures, as well as single-entry single-sided ore extraction stopes and bottom structures, are constructed respectively. The minimum width of the corresponding first stop is calculated based on the single-entry double-sided ore extraction stope and bottom structure model and the angle between the roadway and the ore extraction roadway. The minimum width of the corresponding second stop is calculated based on the single-entry single-sided ore extraction stope and bottom structure model, the length of the ore eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the ore extraction roadway, including: When the bottom structure of a mine adopts the arrangement of ore extraction roadways at the junction of the stope and pillars, and the ore is extracted through the single access roadway through the two-sided stopes, a single access roadway double-sided ore extraction stope and bottom structure model is constructed. Based on the single-entry double-sided ore-exit stope and bottom structure model, the width of the V-shaped trench and the width of the inter-pillar of the V-shaped trench are determined, and the minimum width of the first stope is calculated based on the angle between the trench and the ore-exit entrance.

6. The method for determining the minimum width of a staged open stope followed by filling as described in claim 5, characterized in that, Based on different layouts of the ore extraction roadways, models of single-entry double-sided ore extraction stopes and bottom structures, as well as single-entry single-sided ore extraction stopes and bottom structures, are constructed respectively. The minimum width of the corresponding first stop is calculated based on the single-entry double-sided ore extraction stope and bottom structure model and the angle between the roadway and the ore extraction roadway. The minimum width of the corresponding second stop is calculated based on the single-entry single-sided ore extraction stope and bottom structure model, the length of the ore eyebrow protection line, the distance of the straight section of the roadway, and the angle between the roadway and the ore extraction roadway, including: When the bottom structure adopts a single-entry, single-sided ore extraction layout with the ore extraction roadway located on one side of the stope or pillar, construct a single-entry, single-sided ore extraction stope and bottom structure model. The width between the ore extraction roadway and the V-shaped trench roadway is determined based on the single-entry, single-side ore extraction stope and the bottom structure model. The minimum width of the second stope is calculated based on the single-entry, single-side ore extraction stope and the bottom structure model, the length of the ore eyebrow protection line, the distance of the straight section of the access roadway, and the angle between the roadway and the ore extraction access roadway.

7. The method for determining the minimum width of a staged open stope followed by filling, as described in claim 5, is characterized in that... The formula for calculating the minimum width of the first mining area is: B 1= c / 2+3 b / 2+ L c cos α , In the formula, B 1 represents the minimum width of the first mining area; c The width of the columns in the V-shaped trench; b The width of the V-shaped trench; α The angle between the tunnel and the ore exit route; L c This represents the final minimum ore exit route length.

8. The method for determining the minimum width of a staged open stope followed by filling as described in claim 6, characterized in that, The formula for calculating the minimum width of the second mining area is: B 2=( l 1+ l 2+ L c cos α +2 b + d ) / 2, In the formula, B 2 represents the minimum width of the second mining area; l 1 represents the length of the mine eyebrow protection line; l 2 represents the distance of the straight section of the route; α The angle between the tunnel and the ore exit route; b The width of the V-shaped trench; d The width between the ore extraction roadway and the V-shaped trench roadway; L c This represents the final minimum ore exit route length.

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