CN112253112A - Medium-length hole dynamic squeezing and expanding mining method and device for loose and broken ore body - Google Patents
Medium-length hole dynamic squeezing and expanding mining method and device for loose and broken ore body Download PDFInfo
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- CN112253112A CN112253112A CN202011054518.5A CN202011054518A CN112253112A CN 112253112 A CN112253112 A CN 112253112A CN 202011054518 A CN202011054518 A CN 202011054518A CN 112253112 A CN112253112 A CN 112253112A
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- 238000005065 mining Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 33
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 32
- 239000003921 oil Substances 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 206010000060 Abdominal distension Diseases 0.000 claims 7
- 208000024330 bloating Diseases 0.000 claims 7
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 230000002146 bilateral effect Effects 0.000 abstract 1
- 238000011161 development Methods 0.000 abstract 1
- 230000018109 developmental process Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000005422 blasting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002093 peripheral effect 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
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Abstract
The invention relates to a medium-length hole dynamic squeezing and expanding mining method and device for a loose and broken ore body, and belongs to the technical field of metal mining. Utilize crowded bloated device of hydraulic pressure, including hydraulic oil pump, defeated oil pipe, cylinder body and flexible post, wherein the hydraulic oil pump is connected with the cylinder body through defeated oil pipe, and flexible post is at cylinder body bilateral symmetry arrangement, through crowded bloated hole array parameter of design according to different lithologies in the rock mass, then installs cylinder body, oil pump and defeated oil pipeline, lasts developments and extrudes bloated to the rock mass pressurization, and the completion back production operation is thoroughly destroyed to the regional ore body of back production at last. The method has the advantages of simple and convenient actual operation, safety, high efficiency, repeated recycling and low cost. Compared with the original traditional mining process, the mining process has small damage impact on surrounding rocks and filling bodies, and can be widely applied to the mining of loose and weak broken ore bodies of underground metal mines.
Description
Technical Field
The invention relates to the technical field of metal mining, in particular to a medium-length hole dynamic squeezing and expanding mining method and device for loose and broken ore bodies
Background
At present, underground metal mines mainly adopt the processes of access type stoping, filling method and the like for the mining of loose and weak broken ore bodies to achieve good effects, but still have some problems. Because the traditional mining process adopts an industrial explosive blasting mode to carry out ore breaking, the vibration and the impact in the blasting process are large, the blasting cost is high, the peripheral surrounding rocks, the stope and the filling body are greatly damaged, and meanwhile, the safety of personnel and equipment operating in the stope is also adversely affected. Therefore, a new safe, efficient and low-cost mining method is needed to be found in the mining industry for the extraction of loose and broken ore bodies, so that the economic benefit of enterprises is improved, and the operation safety of personnel and equipment is improved.
Disclosure of Invention
The invention provides a medium-length hole dynamic squeezing and expanding mining method and device for a loose and broken ore body, and aims to solve the problems of stoping by adopting an access stoping and filling method.
The technical scheme adopted by the invention is as follows: the dynamic medium-length hole extruding and expanding device for loosening and crushing ore bodies is used for realizing mining on the loosening and weak crushing ore bodies of an underground metal mine, and comprises the following steps:
the first step is as follows: firstly, constructing a rock drilling operation space at the upper part of a stope, wherein the required height is 2.5-3 m, and the width is 5-7 m; constructing a bottom-drawing ore-drawing layer at the lower part of the stope, wherein the height is 2.5-3 m, and the width is 5-7 m;
the second step is that: constructing a compensation space at the end part of the stope, wherein the width is 5-7 m, and the height is 10-15 m;
the third step: adopting rock drilling equipment to construct extrusion-expansion holes with the aperture of 12cm and the length of 5-8 m in the ore body 2, arranging the holes according to the row spacing of 1-1.2 m and the spacing of 0.6-0.8 m, constructing two rows each time, and adopting plum blossom-shaped staggered arrangement;
the fourth step: installing the cylinder body into the extrusion hole, and simultaneously connecting the hydraulic oil pump and the oil conveying pipe to prepare;
the fifth step: setting the initial pressure of a hydraulic oil pump to be 3MPa, and enabling the telescopic column to pop up and contact with the inner wall of the extrusion hole;
and a sixth step: slowly pressurizing a hydraulic oil pump, and continuously and dynamically pressurizing at intervals of 5MPa until a rock mass begins to crack and be damaged;
the seventh step: after the rock mass is fractured, adjusting the pressure interval of the hydraulic oil pump to 10MPa, and continuously and dynamically pressurizing until the rock mass is completely fractured and collapses to a compensation space;
eighth step: adopting trackless ore removal equipment to enter a drawn-bottom ore removal layer for ore removal, and finishing the ore removal;
the ninth step: and (5) circulating the steps from the second step to the eighth step until the whole mining is finished.
The invention adjusts the arrangement parameters of the extrusion and expansion holes in the third step so as to adapt to the ore body stoping under different lithological conditions.
The RQD value of the loose and weak broken ore body of the underground metal mine is less than 30%, the uniaxial compressive strength is less than 40MPa, the mining height is less than 8m, and the mining width is less than 6 m.
The dynamic squeezing and expanding device for the medium-length hole for loosening and crushing the ore body comprises a hydraulic oil pump, an oil conveying pipe, a cylinder body and telescopic columns, wherein the hydraulic oil pump is connected with the cylinder body through the oil conveying pipe, and the telescopic columns are symmetrically arranged on two sides of the cylinder body.
The cylinder body material is a No. 45 seamless steel pipe, the diameter is 10cm, and the length is 5 m-8 m.
The maximum telescopic length of the telescopic column is 5cm, and the telescopic column is made of solid 45 steel.
The maximum pressure provided by the hydraulic oil pump is 200 MPa.
The telescopic columns are arranged at intervals of 50cm in the vertical direction of the cylinder body.
The invention has the beneficial effects that: by utilizing the hydraulic extrusion expansion device, the arrangement parameters of the extrusion expansion holes are designed according to different lithological properties in the rock mass, then the cylinder body, the oil pump and the oil pipeline are installed, the rock mass is continuously and dynamically pressurized and extruded to expand, and finally, the ore body in the stoping area is thoroughly destroyed to complete the stoping operation. The method is simple and convenient in actual operation, safe and efficient, can be recycled for many times, and is low in cost. Compared with the original traditional mining process, the mining process has small damage impact on surrounding rocks and filling bodies, and can be widely applied to the mining of loose and weak broken ore bodies of underground metal mines.
Drawings
Fig. 1 is a schematic mining view of the present invention, wherein:
the rock drilling operation space 1, an ore body 2, a hydraulic oil pump 3, an oil delivery pipe 4, a cylinder body 5, a compensation space 6, falling ores 7 and a bottom-drawing ore layer 9;
fig. 2 is a schematic structural view of the cylinder body of the present invention, wherein:
an oil delivery pipe 4, a cylinder body 5 and a telescopic column 8;
FIG. 3 is a top view of the cylinder of the present invention;
FIG. 4 is a schematic view of the arrangement of the swelling holes of the present invention, wherein:
Detailed Description
The RQD value of the loose and weak broken ore body of the underground metal mine is less than 30 percent, the uniaxial compressive strength is less than 40MPa, the mining height is less than 8m, and the mining width is less than 6 m; the dynamic extruding and expanding device for the medium-length hole is used for loosening and crushing ore bodies, so that the loosening and weak crushing ore bodies of the underground metal mine can be mined; the medium-length hole dynamic squeezing and expanding device for loosening and crushing ore bodies comprises a hydraulic oil pump 3, an oil conveying pipe 4, a cylinder body 5 and telescopic columns 8, wherein the hydraulic oil pump 3 is connected with the cylinder body 5 through the oil conveying pipe 4, and the telescopic columns 8 are symmetrically arranged on two sides of the cylinder body 5;
the cylinder body 5 is made of a No. 45 seamless steel pipe, the diameter of the cylinder body is 10cm, and the length of the cylinder body is 5 m-8 m;
the maximum telescopic length of the telescopic column 8 is 5cm, and the material is solid 45 steel;
the maximum pressure provided by the hydraulic oil pump 3 is 200 MPa;
the telescopic columns 8 are arranged at intervals of 50cm in the vertical direction of the cylinder body.
Example 1
Comprises the following steps:
the first step is as follows: firstly, constructing a rock drilling operation space 1 at the upper part of a stope, wherein the required height is 2.5m and the width is 5 m; constructing a bottom-drawing ore layer 9 at the lower part of the stope, wherein the height is 2.5m, and the width is 5 m;
the second step is that: constructing a compensation space 6 at the end part of the stope, wherein the width of the compensation space is 5m, and the height of the compensation space is 10 m;
the third step: adopting rock drilling equipment to construct extrusion expansion holes 10 in an ore body 2, wherein the hole diameter is 12cm, the length is 5m, the extrusion expansion holes are arranged according to the row spacing of 1m and the spacing of 0.6m, two rows are constructed each time, and the extrusion expansion holes are arranged in a staggered manner in a plum blossom shape;
the fourth step: installing the cylinder body 5 into the extruding and expanding hole 10, and simultaneously connecting the hydraulic oil pump 3 and the oil conveying pipe 4 to prepare for work;
the fifth step: setting the initial pressure of the hydraulic oil pump 3 to be 3MPa, and enabling the telescopic column 8 to pop up and contact with the inner wall of the extrusion hole 10;
and a sixth step: slowly pressurizing the hydraulic oil pump 3, and continuously and dynamically pressurizing at intervals of 5MPa until the rock mass begins to crack and be damaged;
the seventh step: after the rock mass is fractured, adjusting the pressure interval of the hydraulic oil pump 3 to 10MPa, and continuously and dynamically pressurizing until the rock mass is completely fractured and collapses to the compensation space 6;
eighth step: adopting trackless ore removal equipment to enter a bottom-drawing ore removal layer 9 for ore removal, and finishing the mining;
the ninth step: and (5) circulating the steps from the second step to the eighth step until the whole mining is finished.
Example 2
Comprises the following steps:
the first step is as follows: firstly, constructing a rock drilling operation space 1 at the upper part of a stope, wherein the required height is 2.8m and the width is 6 m; constructing a bottom-drawing ore layer 9 at the lower part of the stope, wherein the height is 2.8m, and the width is 6 m;
the second step is that: constructing a compensation space 6 at the end part of the stope, wherein the width is 6m, and the height is 12 m;
the third step: adopting rock drilling equipment to construct extrusion-expansion holes 10 in an ore body 2, wherein the hole diameter is 12cm, the length is 6.5m, the extrusion-expansion holes are arranged according to the row spacing of 1.1m and the spacing of 0.7m, two rows are constructed each time, and the extrusion-expansion holes are arranged in a staggered manner in a plum blossom shape;
the fourth step: installing the cylinder body 5 into the extruding and expanding hole 10, and simultaneously connecting the hydraulic oil pump 3 and the oil conveying pipe 4 to prepare for work;
the fifth step: setting the initial pressure of the hydraulic oil pump 3 to be 3MPa, and enabling the telescopic column 8 to pop up and contact with the inner wall of the extrusion hole 10;
and a sixth step: slowly pressurizing the hydraulic oil pump 3, and continuously and dynamically pressurizing at intervals of 5MPa until the rock mass begins to crack and be damaged;
the seventh step: after the rock mass is fractured, adjusting the pressure interval of the hydraulic oil pump 3 to 10MPa, and continuously and dynamically pressurizing until the rock mass is completely fractured and collapses to the compensation space 6;
eighth step: adopting trackless ore removal equipment to enter a bottom-drawing ore removal layer 9 for ore removal, and finishing the mining;
the ninth step: and (5) circulating the steps from the second step to the eighth step until the whole mining is finished.
Example 3
Comprises the following steps:
the first step is as follows: firstly, constructing a rock drilling operation space 1 at the upper part of a stope, wherein the required height is 3m and the width is 7 m; constructing a bottom-drawing ore-out layer 9 at the lower part of the stope, wherein the height is 3m, and the width is 7 m;
the second step is that: constructing a compensation space 6 at the end part of the stope, wherein the width is 7m and the height is 15 m;
the third step: adopting rock drilling equipment to construct extrusion and expansion holes 10 with the hole diameter of 12cm and the length of 8m in the ore body 2, arranging the extrusion and expansion holes according to the row spacing of 1.2m and the spacing of 0.8m, constructing two rows each time, and adopting plum blossom-shaped staggered arrangement;
the fourth step: installing the cylinder body 5 into the extruding and expanding hole 10, and simultaneously connecting the hydraulic oil pump 3 and the oil conveying pipe 4 to prepare for work;
the fifth step: setting the initial pressure of the hydraulic oil pump 3 to be 3MPa, and enabling the telescopic column 8 to pop up and contact with the inner wall of the extrusion hole 10;
and a sixth step: slowly pressurizing the hydraulic oil pump 3, and continuously and dynamically pressurizing at intervals of 5MPa until the rock mass begins to crack and be damaged;
the seventh step: after the rock mass is fractured, adjusting the pressure interval of the hydraulic oil pump 3 to 10MPa, and continuously and dynamically pressurizing until the rock mass is completely fractured and collapses to the compensation space 6;
eighth step: adopting trackless ore removal equipment to enter a bottom-drawing ore removal layer 9 for ore removal, and finishing the mining;
the ninth step: and (5) circulating the steps from the second step to the eighth step until the whole mining is finished.
Claims (8)
1. A dynamic squeezing and swelling mining method for a medium-length hole of a loose and broken ore body is characterized in that the mining of the loose and weak broken ore body of an underground metal mine is realized through a dynamic squeezing and swelling device for the medium-length hole of the loose and broken ore body, and the mining method comprises the following steps:
the first step is as follows: firstly, constructing a rock drilling operation space at the upper part of a stope, wherein the required height is 2.5-3 m, and the width is 5-7 m; constructing a bottom-drawing ore-drawing layer at the lower part of the stope, wherein the height is 2.5-3 m, and the width is 5-7 m;
the second step is that: constructing a compensation space at the end part of the stope, wherein the width is 5-7 m, and the height is 10-15 m;
the third step: adopting rock drilling equipment to construct extrusion-expansion holes, wherein the hole diameter is 12cm, the length is 5 m-8 m, the extrusion-expansion holes are arranged according to the row spacing of 1 m-1.2 m and the spacing of 0.6 m-0.8 m, and the extrusion-expansion holes are staggered in a plum blossom shape in two rows each time;
the fourth step: installing the cylinder body into the extrusion hole, and simultaneously connecting the hydraulic oil pump and the oil conveying pipe to prepare;
the fifth step: setting the initial pressure of a hydraulic oil pump to be 3MPa, and enabling the telescopic column to pop up and contact with the inner wall of the extrusion hole;
and a sixth step: slowly pressurizing a hydraulic oil pump, and continuously and dynamically pressurizing at intervals of 5MPa until a rock mass begins to crack and be damaged;
the seventh step: after the rock mass is fractured, adjusting the pressure interval of the hydraulic oil pump to 10MPa, and continuously and dynamically pressurizing until the rock mass is completely fractured and collapses to a compensation space;
eighth step: adopting trackless ore removal equipment to enter a drawn-bottom ore removal layer for ore removal, and finishing the ore removal;
the ninth step: and (5) circulating the steps from the second step to the eighth step until the whole mining is finished.
2. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 1, characterized in that: and adjusting the arrangement parameters of the extrusion and expansion holes in the third step to adapt to the mining of ore bodies with different lithological conditions.
3. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 1, characterized in that: the RQD value of the loose and weak broken ore body of the underground metal mine is less than 30%, the uniaxial compressive strength is less than 40MPa, the mining height is less than 8m, and the mining width is less than 6 m.
4. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 1, characterized in that: the medium-length hole dynamic squeezing and expanding device for loosening and crushing ore bodies comprises a hydraulic oil pump, an oil conveying pipe, a cylinder body and telescopic columns, wherein the hydraulic oil pump is connected with the cylinder body through the oil conveying pipe, and the telescopic columns are symmetrically arranged on two sides of the cylinder body.
5. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 4, characterized in that: the cylinder body is made of a No. 45 seamless steel pipe, the diameter of the cylinder body is 10cm, and the length of the cylinder body is 5 m-8 m.
6. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 4, characterized in that: the maximum telescopic length of the telescopic column is 5cm, and the telescopic column is made of solid 45 steel.
7. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 4, characterized in that: the maximum pressure provided by the hydraulic oil pump is 200 MPa.
8. The medium-length hole dynamic crowd-bloating mining method for loose crushed ore bodies according to claim 4, characterized in that: the telescopic columns are arranged at intervals of 50cm in the vertical direction of the cylinder body.
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| CN202011054518.5A CN112253112B (en) | 2020-09-29 | 2020-09-29 | Medium-length hole dynamic squeezing and expanding mining method and device for loose and broken ore body |
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| CN112253112B CN112253112B (en) | 2022-12-13 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328809A (en) * | 2008-06-25 | 2008-12-24 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Non-bottom pillar deep hole falling-back type mining method |
| CN107503747A (en) * | 2017-10-10 | 2017-12-22 | 中国平煤神马能源化工集团有限责任公司 | A kind of static blasting economic benefits and social benefits fracturing weakens top plate method |
| CN108386193A (en) * | 2018-02-02 | 2018-08-10 | 陕西煤业化工技术研究院有限责任公司 | A kind of hard integrality top plate chemically expansible pressure break pressure relief method in end |
| CN108561136A (en) * | 2018-04-18 | 2018-09-21 | 西安建筑科技大学 | From kerve Block caving system |
| CN108894782A (en) * | 2018-07-31 | 2018-11-27 | 中南大学 | A kind of low temperature frost heave fracturing induction ore body inbreak mining codes |
| CN109372507A (en) * | 2018-12-07 | 2019-02-22 | 张永利 | A kind of hydraulic swelling device and its orientation split swollen fracturing method |
| CN110043263A (en) * | 2019-05-24 | 2019-07-23 | 福州大学 | Low-angle dip based on subregion Pre-control roof is crushed mineral deposit medium-length hole enhanced recovery method |
-
2020
- 2020-09-29 CN CN202011054518.5A patent/CN112253112B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328809A (en) * | 2008-06-25 | 2008-12-24 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Non-bottom pillar deep hole falling-back type mining method |
| CN107503747A (en) * | 2017-10-10 | 2017-12-22 | 中国平煤神马能源化工集团有限责任公司 | A kind of static blasting economic benefits and social benefits fracturing weakens top plate method |
| CN108386193A (en) * | 2018-02-02 | 2018-08-10 | 陕西煤业化工技术研究院有限责任公司 | A kind of hard integrality top plate chemically expansible pressure break pressure relief method in end |
| CN108561136A (en) * | 2018-04-18 | 2018-09-21 | 西安建筑科技大学 | From kerve Block caving system |
| CN108894782A (en) * | 2018-07-31 | 2018-11-27 | 中南大学 | A kind of low temperature frost heave fracturing induction ore body inbreak mining codes |
| CN109372507A (en) * | 2018-12-07 | 2019-02-22 | 张永利 | A kind of hydraulic swelling device and its orientation split swollen fracturing method |
| CN110043263A (en) * | 2019-05-24 | 2019-07-23 | 福州大学 | Low-angle dip based on subregion Pre-control roof is crushed mineral deposit medium-length hole enhanced recovery method |
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