CN114412466A - Conditional ore rock boundary accurate blasting method with unstable ore body stability and unstable upper disc - Google Patents
Conditional ore rock boundary accurate blasting method with unstable ore body stability and unstable upper disc Download PDFInfo
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- CN114412466A CN114412466A CN202210085485.3A CN202210085485A CN114412466A CN 114412466 A CN114412466 A CN 114412466A CN 202210085485 A CN202210085485 A CN 202210085485A CN 114412466 A CN114412466 A CN 114412466A
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- 239000011435 rock Substances 0.000 title claims abstract description 110
- 238000005422 blasting Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005065 mining Methods 0.000 claims abstract description 53
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 230000001143 conditioned effect Effects 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 3
- 239000011707 mineral Substances 0.000 claims 3
- 238000010276 construction Methods 0.000 description 5
- 239000012895 dilution Substances 0.000 description 5
- 238000010790 dilution Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
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- 239000002360 explosive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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Abstract
The invention discloses a method for accurately blasting a conditional ore rock boundary under the condition that an ore body is stable and unstable on a hanging wall, wherein the ore body is stoped in an upward layered manner in a stope, a mining access is constructed on the lowest layer of the ore layer and is pushed to the ore rock boundary, then the mining access is used as a free surface and a compensation space to repeatedly carry out the operations of expanding, pressing and ore removal, blast holes with the same depth are constructed on a rock drilling working surface when the minimum interval between the rock drilling working surface and the exposed hanging wall ore rock boundary is three meters, the blast holes are subjected to sound wave measurement, the blast hole structure is determined according to the measurement result, and blasting is carried out after the blast holes are uniformly charged; and filling the stoping completion area after ore removal is completed, and repeating the operation on the upper layer of ore bed until stoping to the upper middle stope after filling is completed. By the method, the blasting error influence caused by the traditional artificial inference of the rock boundary of the ore is eliminated aiming at the situation that the integrity of the rock body of the rock boundary of the ore is greatly changed, and a standardized operation method is provided for accurate blasting of the rock boundary of the ore.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a conditional ore rock boundary accurate blasting method with unstable ore body stability and upper disc.
Background
In the field of mining, for the situation that the hanging wall ore body changes greatly along the trend and the inclined boundary, the traditional roadway engineering disclosure deduction method is continuously used, namely the drilling depth of the engineering construction is judged according to the engineering disclosure condition near the ore body. In addition, an experienced worker can judge whether the blast hole penetrates to the boundary of the ore body according to the color of slurry flowing out of the hole during drilling, so that whether the drilling construction footage meets the requirement is judged. Although the methods can control the recovery dilution rate and the loss rate to a certain extent, the artificial influence factors are large, and large errors exist.
In the prior art, a mining method for medium-thickness ore bodies is disclosed, wherein an ore prospecting roadway is perpendicular to the length direction of an ore body main body on a preset elevation until the whole ore body is punctured, and under the condition that the ore prospecting drift reveals the distribution of the ore body and surrounding rocks, the ore body is mined and cut, and the ore body main body is subjected to top-picking and stoping by a shallow hole shrinkage method. Although the control degree of the ore body is improved by tunneling the prospecting tunnel in the ore body, the ore recovery rate during mining is also improved to a certain degree, and the ore loss rate and the ore dilution rate are reduced. However, this technique is not suitable for mining areas with large changes in integrity of rock mass at rock boundaries of the ore, and the blasting operation is not accurate during mining, and the recovery rate of the ore cannot be guaranteed to the maximum extent.
Therefore, it is necessary to design a conditional ore rock boundary accurate blasting method which is suitable for ore bodies with large integrity change of ore rock boundary rock mass, has low cost and high ore recovery rate, and can effectively control dilution rate and loss rate of ore caving.
Disclosure of Invention
In order to overcome the problems, the invention provides a conditional ore rock boundary accurate blasting method for stabilizing and hanging unstable ore bodies, which adopts upward layered stoping for a stope, firstly constructs a mining access for the lowest layer of ore bed and pushes the mining access to the ore rock boundary, then repeatedly carries out the operations of expanding, pressing and removing ore by taking the mining access as a free surface and a compensation space, and constructs blast holes with the same depth on a rock drilling working face when the minimum interval between the rock drilling working face and the exposed hanging wall ore rock boundary is 3.0 m; then, carrying out sound wave measurement on the blast holes, determining the charging structure of the blast holes according to the measurement result, and carrying out blasting after uniformly charging the blast holes; and finally, filling the stoping completion area of the current ore bed after ore removal is completed, and repeating the operation on the upper ore bed until stoping is completed to the upper middle stope after filling is completed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for accurately blasting a conditional ore rock boundary with an unstable ore body on a stable upper disc comprises the following steps:
s1, sequentially dividing a stope into a plurality of ore layers from bottom to top, dividing 3 adjacent ore layers into a mining subsection, and arranging a main subsection roadway in each mining subsection;
s2, constructing a stope connection slope way from the subsection main haulage roadway at the lowest layer to the direction of the ore body, and constructing a mining access path to the position of the upper broken rock body from one end, close to the ore body, of the stope connection slope way;
s3, taking the mining access as a free surface and a compensation space to push the broken rock mass to the upper tray along the horizontal direction, expanding the pushing section, and repeatedly carrying out the operations of expanding the side, pressing the top and removing the ore during the pushing;
s4, constructing a plurality of blast holes arranged side by side at the rock drilling working face when the minimum distance between the rock drilling working face and the exposed upper wall rock boundary is 3.0 m;
s5, respectively carrying out sound wave measurement on the plurality of blast holes by adopting a sound wave detector, and determining respective ore rock boundary points of the plurality of blast holes according to the abnormal change inflection point of the sound wave speed;
s6, designing the charging structure of each blast hole according to the determined ore rock boundary point, and uniformly blasting all the blast holes after charging and blocking;
s7, ore removal is carried out on the ore layer after blasting is finished, the stoping finished area of the current ore layer is filled after ore removal is finished, capping, leveling and slag discharging operations are carried out on the stope connection ramp of the current ore layer again after filling is finished, a roadway top plate is gradually lifted towards the direction of the adjacent upper ore layer in the capping process, the bottom plate of the connection ramp is gradually lifted and leveled until the bottom plate of the current connection ramp is consistent with the bottom plate of the adjacent upper ore layer, and a mining approach is constructed at the position of the upper broken rock body from one end, close to the ore body, of the stope connection ramp;
and S8, repeating the steps S3-S7 until the stope is mined to the last section of the stope.
S9, constructing a stope connection slope way from the main transport roadway positioned at the previous subsection to the direction of the ore body, and constructing a mining access path to the position of the upper broken rock body from one end of the stope connection slope way close to the ore body;
and S10, repeating the steps S3-S9 until the stope is mined to the last middle section of the stope.
Further, in step S2, the cross sections of the communication ramp and the mining access road are 3.0m × 3.0 m.
Further, in step S3, when the mining access road is advanced, the expanding blasting is performed on the left and right sides of the mining access road simultaneously, and after the blasting is completed, the top blasting operation is performed on the top free surface to expand the advancing section of the mining access road to 7.0 × 3.5 m.
Further, in step S4, the depth of each of the plurality of blast holes is 3.5m, so as to avoid that the subsequent blasting effect is affected after the depth of each blast hole is insufficient due to the exposed irregular change of the boundary of the ongoing rock.
Further, in step S5, the acoustic detector is a one-shot double-shot acoustic detector, and acoustic detection is performed on each of the blastholes by using a single-hole refraction method, where a measurement step pitch of the one-shot double-shot acoustic detector is 0.1 m.
Further, in step S6, the charging manner of the blast hole is to plug the part of the structure from the boundary point of the ore rock to the bottom of the hole corresponding to the blast hole with stemming, and to normally charge and plug the part of the structure from the boundary point of the ore rock to the hole opening corresponding to the blast hole.
Further, in step S7, the filling is performed by full-tailings cemented filling of the mined ore bed masonry filling retaining wall, and the filling height is 3.5 m.
Further, in step S7, the inclination angle of the bottom plate of the communication ramp formed by capping is less than 10 °, and the section thereof is 3.0m × 3.0 m.
Further, after the filling is finished, the filling body is maintained for seven days, and then the operation is carried out on the ore bed above the current ore bed.
Further, in step S1, the stope is arranged along a direction perpendicular to the direction of the ore body, and an upward horizontal cut-and-fill mining method is used.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a conditional mine rock boundary accurate blasting method with unstable ore body stability and upper wall, which adopts upward layered stoping to a stope, a mining access is firstly constructed on the lowest layer of ore bed and is pushed to the boundary of the mine rock, then the mining access is used as a free surface and a compensation space to repeatedly carry out the operations of expanding, pressing and ore removal, and blast holes with the same depth are constructed on a rock drilling working face when the minimum interval between the rock drilling working face and the exposed upper wall mine rock boundary is 3.0 m; then, carrying out sound wave measurement on the blast holes, determining the charging structure of the blast holes according to the measurement result, and carrying out blasting after uniformly charging the blast holes; and finally, filling the stoping completion area of the current ore bed after ore removal is completed, and repeating the operation on the upper ore bed until stoping is completed to the upper middle stope after filling is completed. The invention aims at the situation that the integrity of the rock body of the ore rock boundary is changed greatly, gets rid of the blasting error influence caused by the traditional artificial inference of the ore rock boundary, and provides a standardized operation method for the accurate blasting of the ore rock boundary.
2. The method for accurately blasting the condition ore rock boundary with unstable ore body stability and upper disc comprises the steps of pre-estimating the ore body boundary according to the known boundary condition, further determining the unified blast hole design depth, utilizing the acoustic velocity difference of lithology with different integrity degrees, and adopting a single-hole one-sending double-receiving acoustic detection technology to carry out blast hole full-length acoustic measurement on the constructed blast holes one by one, thereby accurately distinguishing the ore rock boundary according to the wave velocity fluctuation difference. In addition, the invention can also accurately position the boundary point of the ore rock in the blast hole according to the sound wave measurement result, thereby designing the hole bottom blocking length and the charging length, achieving the purpose of accurate blasting, and reducing the loss rate and the dilution rate to the maximum extent.
Drawings
FIG. 1 is a schematic drawing of a stope cross-section of the lowermost ore layer of the method for accurately blasting the conditioned rock boundary with unstable ore body stability according to the invention;
FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 2;
FIG. 4 is a schematic diagram of a sonic measurement curve of the method for accurately blasting the boundary of the conditioned rock with unstable ore body stability;
the parts in the drawings are numbered as follows: 10. an ore body; 20. undisclosed hanging wall rock boundaries; 30. the upper plate crushes rock mass; 40. exposed hanging wall rock boundaries; 50. mining an approach; 60. blast holes; 61. an explosive; 62. stemming; 63. a detonator; 64. a rock-ore demarcation point in the hole; 70. a stoping completion area; 80. connecting a slope ramp in a stope; 90. and pressing against the working surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and processing steps closely related to the scheme of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Examples
As shown in fig. 1 to 2, a method 100 for blasting precisely a conditioned rock boundary with unstable ore body stability and upper wall is suitable for a stope with an ore body 10 with large inclination thickness. The stability of the upper plate of the stope is poor, an upward horizontal layered filling mining method is adopted, and a connecting slope ramp is arranged on each divided layer of the ore bed to connect the main transportation roadway of the subsection, so that the subsequent stoping operation is facilitated.
As shown in fig. 1 to 4, specifically, the method includes the steps of:
and S1, sequentially dividing the stope into a plurality of ore layers from bottom to top, dividing 3 adjacent ore layers into one mining section, and arranging a main sectional haulage roadway on each mining section.
In this step, the stope is arranged along the direction perpendicular to the ore body 10, and the stope is sequentially stoped for each ore layer from bottom to top by adopting an upward horizontal layered filling mining method. A main subsection conveying roadway is arranged on each 3 adjacent ore layers and communicated with a stope through a communication slope way, and the main subsection conveying roadway is arranged along the direction perpendicular to the trend of the ore body 10 so as to convey the mined ore.
And S2, constructing a stope connection slope way 80 from the subsection main haulage roadway at the lowest layer to the direction of the ore body, and constructing a mining access road 50 to the position of the upper plate crushed rock body 30 from one end, close to the ore body, of the stope connection slope way 80.
In this step, the cross sections of the communication ramp 80 and the mining access road 50 are 3.0m × 3.0m, and the drill jumbo is used for rock drilling and stoping, and the stoped ore is 1.5m3Or 2m3The scraper is used for ore removal.
S3, the mining access 50 is used as a free surface and the compensation space to advance the upper broken rock body 30 in the horizontal direction, the advancing section is enlarged, and the operations of expanding the upper, pressing the roof and removing the mine are repeated during the advancing.
As shown in fig. 1 to 2, in this step, when the mining access road 50 is advanced, the expanding blasting is performed simultaneously on the left and right sides of the mining access road 50 to expand the width of the mining access road 50, and after the blasting is completed, the top pressing blasting operation is performed on the top pressing working face 90 to expand the height of the mining access road 50 and ensure the safety of the construction. The push cross-section of the mining access road 50 is enlarged to 7.0m x 3.5m by repeated operations of slope expansion, roof pressing and ore removal.
And S4, constructing a plurality of blast holes 60 arranged side by side at the rock drilling working face when the minimum distance between the rock drilling working face and the exposed upper wall rock boundary 40 is 3.0 m.
As shown in fig. 1 to 3, in this step, the boundary of the ore body 10 is estimated according to the known boundary condition, so as to determine the design depth of the uniform blast holes 60, and the depths of the plurality of blast holes 60 are all set to 3.5m, and when the depths of all the blast holes 60 are set to 3.5m, it can be ensured that the hole depth of any one blast hole 60 is greater than 3.0m of the minimum interval between the rock drilling working face and the exposed upper wall rock boundary 40, so that the influence on the subsequent blasting effect caused by the insufficient depth of the blast hole 60 due to the irregular change of the exposed upper wall rock boundary 40 is avoided. The upper disclosed hanging wall rock boundary 40 runs upward to the upper undiscovered hanging wall rock boundary 20. For example, the exposed hanging wall rock boundary 40 is obliquely distributed leftwards and upwards, and the minimum distance between the rock drilling working face and the obliquely arranged hanging wall rock boundary is compared, at this time, the distance between the rock drilling working face and the top end of the hanging wall rock boundary should be compared, and the distance is guaranteed to be 3.0 m.
And S5, respectively carrying out sound wave measurement on the plurality of blast holes 60 by adopting a sound wave detector, and determining the respective ore rock boundary points of the plurality of blast holes 60 according to the inflection point of the abnormal change of the sound wave speed.
As shown in fig. 3 to 4, in this step, the acoustic detector is a one-shot double-shot acoustic detector, and full-length acoustic detection is performed on each blast hole 60 by using a single-hole refracted wave method. In particular, the measurement step pitch of the one-shot double-receiving acoustic wave detector is 0.1 m. The blast hole 60 detection method can utilize the acoustic velocity difference of lithology with different integrity degrees, and adopts a single-hole one-shot double-receiving acoustic detection technology to carry out full-length acoustic measurement on the constructed blast holes 60 one by one, thereby accurately distinguishing the rock boundary according to the wave velocity fluctuation difference. In addition, the in-hole ore rock boundary point 64 of the blast hole 60 can be accurately positioned according to the sound wave measurement result, so that the hole bottom blocking length and the charging length are designed, the purpose of accurate blasting is achieved, the method is more scientific and reasonable compared with judgment, and the loss rate and the dilution rate of ore rocks are reduced to the maximum extent.
In particular, the inflection point of the abnormal change of the acoustic velocity can be directly obtained according to the acoustic measurement curve chart of the ore rock boundary.
And S6, designing the charging structure of each blast hole 60 according to the determined ore and rock boundary points, and uniformly blasting all the blast holes 60 after charging and blocking.
As shown in fig. 3 to 4, in this step, the charging manner of the blast hole 60 is to plug the part of the structure from the boundary point of the ore rock to the bottom of the hole corresponding to the blast hole 60 with the stemming 62, and to normally charge and plug the part of the structure from the boundary point of the ore rock to the hole opening corresponding to the blast hole 60, so as to achieve the purpose of precise blasting. After the explosive filling 61 and the blocking of all the blast holes 60 are completed in sequence, the detonators 63 are placed to carry out blasting uniformly.
And S7, ore removal is carried out on the ore layer after blasting is finished, the stoping finished area 70 of the current ore layer is filled after ore removal is finished, capping, leveling and slag discharging operations are carried out on the stope connection ramp 80 of the current ore layer again after filling is finished, the roadway roof is gradually lifted towards the direction of the adjacent upper ore layer in the capping process, the filling connection ramp bottom plate is gradually lifted until the bottom plate of the current connection ramp 80 is consistent with the adjacent upper ore layer bottom plate, and a mining route 50 is constructed to the position of the upper broken rock mass 30 from one end, close to the ore body, of the stope connection ramp 80.
In the step, the filling mode adopts a mode of carrying out full-tailing cemented filling on the ore bed masonry filling retaining wall after ore removal, and the filling height is 3.5 m. Particularly, after the filling is finished, the filling body is maintained for seven days, and then the roof pressing, leveling and slag tapping operations are carried out on the stope connection slope way 80 of the current ore bed, so that the construction of the upper ore bed is carried out subsequently.
And S8, repeating the steps S3-S7 until the stope is mined to the last section of the stope.
S9, constructing a stope connection slope way from the main transport roadway positioned at the previous subsection to the direction of the ore body, and constructing a mining access path to the position of the upper broken rock body from one end of the stope connection slope way close to the ore body;
in the step, according to the mining mode of the steps S3-S9, the other sublevel ore layers are subjected to stoping blasting from bottom to top in sequence until stoping is carried out to the upper middle section position of the stope.
In conclusion, the method adopts upward layered mining for a stope, a mining access 50 is firstly constructed on the lowest layer of ore deposit and is pushed to the boundary of ore rocks, the operations of expanding the side, pressing the top and removing the ore are repeatedly carried out in the pushing process, and blast holes 60 with the same depth are constructed on the rock drilling working face when the minimum interval between the rock drilling working face and the exposed upper wall ore rock boundary 40 is 3.0 m; then, carrying out sound wave measurement on the blast holes 60, determining the charging structure of the blast holes 60 according to the measurement result, and carrying out blasting after uniformly charging the blast holes 60; and finally, filling the stoping completion area of the current ore bed after ore removal is completed, and repeating the operation on the upper ore bed until stoping is completed to the upper middle stope after filling is completed. Aiming at the situation that the integrity of the rock body of the ore rock boundary is changed greatly, the blasting error influence caused by the traditional artificial inference of the ore rock boundary is eliminated, a standardized operation method is provided for the accurate blasting of the ore rock boundary, and the method is scientific, safe and efficient. Meanwhile, the equipment adopted by the method is conventional equipment, the construction is simple, the cost is low, and the method has a good application prospect.
The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The method for accurately blasting the conditional ore rock boundary with the unstable ore body on the stable upper disc is characterized by comprising the following steps of:
s1, sequentially dividing a stope into a plurality of ore layers from bottom to top, dividing 3 adjacent ore layers into a mining subsection, and arranging a main subsection roadway in each mining subsection;
s2, constructing a stope connection slope way (80) from the subsection main haulage roadway at the lowest layer to the direction of the ore body, and constructing a mining access way (50) to the position of the upper broken rock body (30) from one end, close to the ore body, of the stope connection slope way (80);
s3, pushing the broken rock mass (30) to the upper tray in the horizontal direction by taking the mining access (50) as a free surface and a compensation space, expanding the pushing section, and repeatedly carrying out the operations of expanding the side, pressing the top and removing the ore during the pushing process;
s4, constructing a plurality of blast holes (60) which are arranged side by side at the rock drilling working face when the minimum distance between the rock drilling working face and the exposed upper wall rock boundary (40) is 3.0 m;
s5, respectively carrying out sound wave measurement on the plurality of blast holes (60) by adopting a sound wave detector, and determining respective ore rock boundary points of the plurality of blast holes (60) according to the inflection point of the abnormal change of the sound wave speed;
s6, designing the charging structure of each blast hole (60) according to the determined ore and rock boundary points, and uniformly blasting all the blast holes (60) after charging and blocking;
s7, ore removal is carried out on the ore layer after blasting is finished, a stoping finished area (70) of the current ore layer is filled after ore removal is finished, capping, leveling and slag discharging operations are carried out on a stope connection slope way (80) of the current ore layer again after filling is finished, a roadway roof is gradually lifted towards the direction of the adjacent upper ore layer in the capping process, a filling connection slope way bottom plate is gradually lifted until the bottom plate of the current connection slope way is consistent with the adjacent upper ore layer bottom plate, and a mining access (50) is constructed to the position of the upper plate crushed rock body (30) from one end, close to the ore body, of the stope connection slope way (80);
and S8, repeating the steps S3-S7 until the next section of the stope is stoped.
S9, constructing a stope connection slope way (80) from the main haulage roadway positioned at the previous subsection to the ore body direction, and constructing a mining access way (50) to the position of the upper broken rock body (30) from one end, close to the ore body, of the stope connection slope way (80);
and S10, repeating the steps S3-S9 until the stope is mined to the last middle section of the stope.
2. The method for precision blasting of conditioned rock boundaries with unstable ore body stability according to claim 1, wherein the cross sections of the communication ramp (80) and the mining access road (50) are 3.0m x 3.0m in step S2.
3. The method for precisely blasting the boundary of the conditional ore rock with unstable ore body stability according to claim 1, wherein in step S3, the mining access (50) is advanced by simultaneously performing the expanding blasting on the left and right sides of the mining access (50) and performing the top blasting operation with the top free surface after the blasting is completed to expand the advancing section of the mining access (50) to 7.0 mx 3.5 m.
4. The method for precisely blasting the conditioned ore rock boundary with unstable ore body stability according to claim 1, wherein the depth of each of the plurality of blast holes (60) is 3.5m in step S4, so as to avoid the influence on the subsequent blasting effect caused by the insufficient depth of the blast holes (60) due to the irregular change of the exposed upper ore rock boundary (40).
5. The method for precisely blasting the boundary of the conditioned ore rock with unstable ore body stability according to claim 1, wherein in step S5, the sonic detector is a one-shot double-received sonic detector, and sonic detection is performed on each blast hole (60) by using a single-hole refracted wave method, and the measurement step pitch of the one-shot double-received sonic detector is 0.1 m.
6. The method for precisely blasting the conditional mineral rock boundary with unstable ore body stability according to claim 1, wherein in step S6, the blast hole (60) is charged in such a manner that the part of the structure from the mineral rock boundary point to the bottom of the blast hole (60) corresponding to the blast hole (60) is plugged with stemming (62), and the part of the structure from the mineral rock boundary point to the mouth of the blast hole (60) corresponding to the blast hole is normally charged and plugged.
7. The method for precisely blasting the conditional ore rock boundary with unstable ore body stability according to claim 1, wherein in step S7, the filling is performed by full tailings cemented filling of the ore bed masonry filling retaining wall after ore removal, and the filling height is 3.5 m.
8. The method for precision blasting of conditioned rock boundaries with unstable ore body stability according to claim 1, characterized in that in step S7, the inclination of the bottom plate of the communication ramp (80) formed by capping is less than 10 °, and the section thereof is 3.0m x 3.0 m.
9. The precision blasting method for the conditioned rock boundary with unstable ore body stability according to claim 7, characterized in that after the filling is completed, the filling body is maintained for seven days before the operation is performed on the ore layer adjacent to and above the current ore layer.
10. The method for precision blasting of conditioned rock boundaries with unstable ore body stability according to claim 1, characterized in that, in step S1, a stope is arranged along a vertical direction to the trend of the ore body (10) and an upward horizontal cut-and-fill mining method is adopted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210085485.3A CN114412466B (en) | 2022-01-25 | 2022-01-25 | Accurate blasting method for ore rock boundary in stable ore body mining process with unstable upper wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210085485.3A CN114412466B (en) | 2022-01-25 | 2022-01-25 | Accurate blasting method for ore rock boundary in stable ore body mining process with unstable upper wall |
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| CN114412466A true CN114412466A (en) | 2022-04-29 |
| CN114412466B CN114412466B (en) | 2022-10-25 |
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