CN110821493B - Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face - Google Patents
Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face Download PDFInfo
- Publication number
- CN110821493B CN110821493B CN201810889830.2A CN201810889830A CN110821493B CN 110821493 B CN110821493 B CN 110821493B CN 201810889830 A CN201810889830 A CN 201810889830A CN 110821493 B CN110821493 B CN 110821493B
- Authority
- CN
- China
- Prior art keywords
- coal
- caving
- section
- coal caving
- reverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Abstract
A coal caving system and method for reducing the loss of coal at the top of the end of a fully mechanized caving face mainly comprise an end reverse-sequence coal caving mode, an upper end coal caving section, a lower end coal caving section, a positive-sequence coal caving section, a reverse-sequence coal caving section and an end reverse-sequence coal caving section analysis system; the end head reverse-sequence coal caving mode is that all coal caving supports except an upper end head non-coal caving section and a lower end head non-coal caving section in the fully mechanized caving working face are divided into a positive-sequence coal caving section and a reverse-sequence coal caving section; the positive sequence coal discharging section means that the coal discharging direction in the section is the same as the coal cutting direction of a coal mining machine and is adjacent to the section without the coal discharging at the upper end; the reverse coal discharging section is that the direction of discharging coal in the section is opposite to the coal cutting direction of a coal mining machine and is adjacent to the section without discharging coal at the lower end; the end head reverse-order coal caving segment analysis system is arranged on the upper end head coal caving segment and is used for determining the length of the reverse-order coal caving segment. The coal caving system and the method for reducing the loss of the top coal at the end of the fully mechanized caving face optimize the traditional coal caving process and can effectively reduce the loss of the top coal in fully mechanized caving mining.
Description
Technical Field
The invention relates to the technical field of comprehensive mechanized caving coal mining, in particular to a coal caving system and a method for reducing loss of top coal at the end of a fully mechanized caving face.
Background
Since the 20 th century and the 80 th century, the fully mechanized caving mining technology is introduced into China, and has the advantages of small roadway excavation amount, strong geological adaptability, multi-point coal production and the like, so that the fully mechanized caving mining technology is rapidly popularized in the mining of the thick coal seam in China, secondary innovation and development are carried out in long-term engineering practice, and a series of important achievements such as large mining height fully mechanized caving of the super-thick coal seam, long-wall fully mechanized caving of the steeply inclined coal seam and the like are obtained. In the future, the fully mechanized caving mining still remains one of the important technical approaches for mining the western ultra-thick coal seam in China for a long time. However, the loss amount of the top coal in the fully mechanized caving mining, particularly the loss amount of the top coal at the end of a working face is large, and the reduction of the loss amount of the top coal in the coal caving process as far as possible is an important technical problem for the fully mechanized caving mining. Therefore, the coal caving system and the method for reducing the loss of the fully-mechanized caving mining top coal are researched and developed, and the system and the method have important strategic significance for forming a fully-mechanized caving mining technology with high efficiency and high resource recovery rate. At present, in the field production practice, the basic idea of reducing the loss of the top coal and the common process optimization approaches mainly comprise the following steps:
(1) the coal loss of the step pitch is reduced as much as possible by adjusting the coal caving step pitch;
(2) through multi-round coal caving, the coal rock interface sinks uniformly, and the loss of residual coal between frames is reduced;
(3) the mining and discharging ratio is adjusted by increasing the coal cutting height, so that the mining rate of a working face is maximized;
(4) the initial mining loss is reduced by reducing the length of the section without coal discharge through the cutting hole;
(5) by increasing the face length, segment losses are reduced.
The technical optimization measures are considered from the point of field practice, and influence mechanisms of different technical top coal caving body forms, coal rock interface characteristics and interaction between the top coal caving body forms and the coal rock interface characteristics on reduction of top coal loss are not considered. In conclusion, the coal caving system and method for reducing the loss of top coal at the end head of the fully mechanized caving face are provided by comprehensively considering the relationship among the coal rock interface, the top coal caving body and the top coal extraction rate, so that high-yield and high-efficiency production work is realized.
Disclosure of Invention
The invention aims to provide a coal caving system and a method for reducing the loss of coal caving at the end head of a fully mechanized caving face.
The technical scheme of the invention is as follows:
a coal caving system for reducing the loss of top coal at the end head of a fully mechanized caving face is characterized by comprising an end head reverse-order coal caving mode, an upper end head coal caving section, a lower end head coal caving section, a positive-order coal caving section, a reverse-order coal caving section and an end head reverse-order coal caving section analysis system;
the end head reverse-sequence coal caving mode is that all coal caving supports except the upper end head non-coal caving section and the lower end head non-coal caving section in the fully mechanized caving face are divided into a positive-sequence coal caving section and a reverse-sequence coal caving section; the positive sequence coal discharging section is that the coal discharging direction in the section is the same as the coal cutting direction of a coal cutter, and is adjacent to the section without the coal discharging at the upper end head; the reverse coal discharging section is that the direction of discharging coal in the section is opposite to the coal cutting direction of a coal cutter and is adjacent to the section without discharging coal at the lower end head; the end head reverse-order coal caving segment analysis system is arranged on the upper end head coal caving segment and is used for determining the length of the reverse-order coal caving segment;
the end head reverse-order coal caving section analysis system comprises an information acquisition module, a neural network system analysis module and an information output module;
the information acquisition module is used for manually inputting basic information of a working face, and the basic information comprises working face length, working face inclination angle, coal seam thickness, direct roof thickness, gangue clamping thickness and total number data information of working face brackets;
the neural network system analysis module is used for processing and analyzing the data information input by the information acquisition module and storing a data processing result to update the module database information;
the information output module is used for displaying the data processing result of the neural network system analysis module, and comprises the length of a reverse-order coal caving segment, the number of supports of the reverse-order coal caving segment, a predicted value of the working face top coal mining rate and a working face top coal mining rate increase rate compared with that of common coal caving;
the method for determining the length of the reverse-order coal caving segment by the neural network system analysis module comprises the following steps:
in the formula, p is the increase rate of the total coal discharge amount of the reverse-sequence coal discharge section,%;
Lrm is the length of the coal caving segment in the reverse order;
Qi' the coal discharge amount of the bracket I in the coal discharge period of the reverse coal discharge section, m3；
QiThe coal discharging amount of the bracket I in the coal discharging time period of the positive sequence coal discharging section is m3；
W is the length of the center distance of the coal caving bracket, m;
n is the total number of the coal caving supports of the fully mechanized caving face;
when the total coal caving amount growth rate p of the reverse-order coal caving segment reaches the maximum value, the length L of the reverse-order coal caving segment can be determinedr；
The coal caving method for reducing the coal caving loss of the end of the fully mechanized caving face comprises the following steps:
a. reasonably arranging a top coal caving mining working face and matching with mining, transporting and supporting equipment;
b. numbering the coal caving supports from the upper end to the lower end, wherein the numbers are 1, 2, … and n;
c. starting the end head reverse-order coal caving section analysis system, and manually inputting basic information of a working face;
d. determining the length of the negative-sequence coal caving segment and a predicted value of the top coal mining rate of the working face according to the information displayed by the information output module;
e. the coal caving operation of the working face is started, the positive sequence coal caving section is firstly carried out, and the coal caving process is sequentially opened
Number coal caving support tail beam
Starting coal caving of a reverse coal caving section after coal caving of the bracket is finished;
f. the coal discharging process of the reverse coal discharging section is opened in sequence
The tail beam of the bracket is a U-shaped bracket,
closing the tail beam after the coal discharging of the number support is finished, and finishing the coal discharging of the current round;
g. and (4) moving the working face support, carrying out next coal caving round, and repeating the processes of the steps c to f.
The coal caving system and the method for reducing the loss of the top coal at the end of the fully mechanized caving face improve the extraction rate of the top coal in the fully mechanized caving face, can increase the discharging degree of the top coal at the end, reduce the loss of the top coal at the end and the middle part of the face and realize the balance of coal caving; the top coal mining rate is tested on site, so that the loss of the top coal at the end of the working face is obviously reduced, and the high-efficiency and high-resource mining rate fully-mechanized caving mining of the thick coal seam is realized.
Drawings
The present invention will be better understood and appreciated more fully when considered in conjunction with the accompanying drawings. The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure.
FIG. 1 is a schematic view of a coal caving system for reducing the loss of top coal at the end of a fully mechanized caving face;
FIG. 2 is a schematic diagram of a fully mechanized caving face end head reversed-order coal caving segment analysis system;
FIG. 3 is a coal-rock interface comparison diagram after the normal-sequence coal caving and the end head reverse-sequence coal caving are finished;
FIG. 4 is a comparison graph of top coal caving at the junction of positive and negative sequence coal caving sections for normal positive sequence coal caving and end negative sequence coal caving.
In the figure: 1. an upper end non-coal-caving section 2, a positive-sequence coal-caving section 3, a negative-sequence coal-caving section 4, a lower end non-coal-caving section 5, an end negative-sequence coal-caving section analysis system 51, an information acquisition module 52, a neural network system analysis module 53, an information output module 6, a coal-rock interface 7 after the end negative-sequence coal-caving is finished, a coal-rock interface 8 after the end of the common positive-sequence coal-caving, a top coal-discharging body 9 at the joint of the positive-sequence coal-caving section and the negative-sequence coal-caving section of the end negative-sequence coal-caving, and a top coal-discharging body 9 at the joint of the positive-sequence coal-caving section and the negative-sequence coal-caving section of the common positive-sequence coal-caving
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4, a coal caving system for reducing the loss of coal at the top of a fully mechanized caving face end comprises an end reversed-order coal caving mode, an upper end coal caving section 1, a lower end coal caving section 4, a positive-order coal caving section 2, a reverse-order coal caving section 3 and an end reversed-order coal caving section analysis system 5;
the end head reverse-sequence coal caving mode is that all coal caving supports except an upper end head non-coal caving section 1 and a lower end head non-coal caving section 4 in a fully mechanized caving working face are divided into a positive-sequence coal caving section 2 and a reverse-sequence coal caving section 3; the positive sequence coal discharging section 2 is that the coal discharging direction in the section is the same as the coal cutting direction of a coal mining machine and is adjacent to the upper end non-coal discharging section 1; the reverse coal discharging section 3 is that the direction of discharging coal in the section is opposite to the coal cutting direction of a coal mining machine and is adjacent to the coal discharging-free section 4 at the lower end; the end head reverse-sequence coal caving section analysis system 5 is arranged on the upper end head coal caving section 1 and is used for determining the length of the reverse-sequence coal caving section 3;
the end head reverse coal caving segment analysis system 5 comprises an information acquisition module 51, a neural network system analysis module 52 and an information output module 53;
the information acquisition module 51 is used for manually inputting basic information of a working face, including data information of the length of the working face, the inclination angle of the working face, the thickness of a coal bed, the thickness of a direct roof, the thickness of a gangue, and the total number of brackets of the working face;
the neural network system analysis module 52 is used for processing and analyzing the data information input by the information acquisition module and storing the data processing result to update the module database information;
the information output module 53 is used for displaying the data processing result of the neural network system analysis module, and comprises the length of a reverse-sequence coal caving segment, the number of supports of the reverse-sequence coal caving segment, a predicted value of the mining rate of the top coal of the working face, and the mining rate of the top coal of the working face, which is increased compared with that of the common coal caving;
the method for determining the length of the reverse-order coal caving segment by the neural network system analysis module 52 is as follows:
in the formula, p is the increase rate of the total coal discharge amount of the reverse coal discharge section 3,%;
Lrthe length of the coal discharging section 3 in the reverse order is m;
Qi' the coal discharge amount of bracket No. i in the coal discharge period of the reverse coal discharge section 3, m3；
QiThe coal discharging amount of the bracket I in the coal discharging time period of the positive sequence coal discharging section 2 is m3；
W is the length of the center distance of the coal caving bracket, m;
n is the total number of the coal caving supports of the fully mechanized caving face;
when the total coal caving amount growth rate p of the reverse-sequence coal caving section 3 reaches the maximum value, the length L of the reverse-sequence coal caving section 3 can be determinedr；
The coal caving method for reducing the coal caving loss of the end of the fully mechanized caving face comprises the following steps:
a. reasonably arranging a top coal caving mining working face and matching with mining, transporting and supporting equipment;
b. numbering the coal caving supports from the upper end to the lower end, wherein the numbers are 1, 2, … and n;
c. starting the end head reverse-order coal caving section analysis system 5, and manually inputting basic information of a working face;
d. determining the length of the negative sequence coal caving section 3 and the predicted value of the top coal mining rate of the working face according to the information displayed by the information output module 53;
e. the coal caving operation of the working face is started, the positive sequence coal caving section 2 is firstly carried out, and the coal caving process is opened in sequence
Number coal caving support tail beam
Coal discharge of the coal discharging section 3 in a reverse order is started after coal discharge of the bracket is finished;
f. the coal discharging process of the 3 coal discharging sections in the reverse order is opened in sequence
The tail beam of the bracket is a U-shaped bracket,
closing the tail beam after the coal discharging of the number support is finished, and finishing the coal discharging of the current round;
g. and (4) moving the working face support, carrying out next coal caving round, and repeating the processes of the steps c to f.
For further illustration of the present invention, a coal caving system and method for reducing the loss of coal from the end of a fully mechanized caving face provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1:
the invention provides a coal caving system and a method for reducing the loss of coal caving at the end of a fully mechanized caving face, according to a certain mining geological condition, the coal caving process comprises the following operation steps:
a. reasonably arranging a top coal caving mining working face and matching with mining, transporting and supporting equipment;
b. numbering the coal caving supports from the upper end to the lower end, wherein the numbers are 1, 2, … and 10;
c. starting the end head reverse-order coal caving section analysis system 5, and manually inputting basic information of a working face;
d. according to the information displayed by the information output module 53, the length of the reverse-sequence coal caving section 3 is determined to be 6cm and the predicted value of the top coal mining rate of the working face is 83%;
e. the working face coal caving operation is started, firstly, the coal caving of the positive-sequence coal caving section 2 is carried out, the tail beams of No. 1, No. 2, No. … and No. 6 coal caving supports are opened in sequence in the coal caving process, and the coal caving of the negative-sequence coal caving section 3 is started after the coal caving of the No. 6 support is finished;
f. in the coal discharging process of the reverse coal discharging section 3, tail beams of No. 10, No. 9, No. 8 and No. 7 supports are opened in sequence, and the tail beams are closed after the coal discharging of the No. 7 supports is finished, so that the coal discharging of the round is completed;
g. and (4) moving the working face support, carrying out next coal caving round, and repeating the processes of the steps c to f.
Example 2:
and analyzing the influence of the coal caving mode on the top coal caving amount according to certain mine geological conditions.
The coal caving is carried out on the same working face according to two modes of a common positive sequence and the coal caving method for reducing the loss of the top coal at the end of the fully mechanized caving working face, the measured coal caving amount of the coal caving system is improved by 26.89 percent compared with the coal caving in the common positive sequence, and the loss of the top coal at the end of the lower end is reduced by 13.98 percent.
The embodiment shows that the method provided by the invention has the characteristics of less loss of the top coal and high mining efficiency.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (2)
1. A coal caving method for reducing the loss of coal at the end top of a fully mechanized caving face, which is characterized by comprising a coal caving system for reducing the loss of coal at the end top of the fully mechanized caving face;
the system comprises an end head reverse-sequence coal caving mode, an upper end head coal caving section, a lower end head coal caving section, a positive-sequence coal caving section, a reverse-sequence coal caving section and an end head reverse-sequence coal caving section analysis system;
the end head reverse-sequence coal caving mode is that all coal caving supports except the upper end head non-coal caving section and the lower end head non-coal caving section in the fully mechanized caving face are divided into a positive-sequence coal caving section and a reverse-sequence coal caving section; the positive sequence coal discharging section is that the coal discharging direction in the section is the same as the coal cutting direction of a coal cutter, and is adjacent to the section without the coal discharging at the upper end head; the reverse coal discharging section is that the direction of discharging coal in the section is opposite to the coal cutting direction of a coal cutter and is adjacent to the section without discharging coal at the lower end head; the end head reverse-order coal caving segment analysis system is arranged on the upper end head coal caving segment and is used for determining the length of the reverse-order coal caving segment;
the end head reverse-order coal caving section analysis system comprises an information acquisition module, a neural network system analysis module and an information output module;
the information acquisition module is used for manually inputting basic information of a working face, and the basic information comprises working face length, working face inclination angle, coal seam thickness, direct roof thickness, gangue clamping thickness and total number data information of working face brackets;
the neural network system analysis module is used for processing and analyzing the data information input by the information acquisition module and storing a data processing result to update the module database information;
the information output module is used for displaying the data processing result of the neural network system analysis module, and comprises the length of a reverse-order coal caving segment, the number of supports of the reverse-order coal caving segment, a predicted value of the working face top coal mining rate and a working face top coal mining rate increase rate compared with that of common coal caving;
the method comprises the following steps:
a. reasonably arranging a top coal caving mining working face and matching with mining, transporting and supporting equipment;
b. numbering the coal caving supports from the upper end to the lower end, wherein the numbers are 1, 2, … and n;
c. starting the end head reverse-order coal caving section analysis system, and manually inputting basic information of a working face;
d. determining the length of the negative-sequence coal caving segment and a predicted value of the top coal mining rate of the working face according to the information displayed by the information output module;
e. the coal caving operation of the working face is started, firstly, the coal caving section of the positive sequence is performed, and the coal caving process is opened in sequence 1, 2
Number coal caving support tail beam
Starting coal caving of a reverse coal caving section after coal caving of the bracket is finished;
wherein L isrM is the length of the coal caving segment in the reverse order;
w is the length of the center distance of the coal caving bracket, m;
n is the total number of the coal caving supports of the fully mechanized caving face;
f. n, n-1 are opened in sequence in the coal caving process of the reverse coal caving section
The tail beam of the bracket is a U-shaped bracket,
closing the tail beam after the coal discharging of the number support is finished, and finishing the coal discharging of the current round;
g. and (4) moving the working face support, carrying out next coal caving round, and repeating the processes of the steps c to f.
2. The coal caving method for reducing the loss of the top coal at the end of the fully mechanized caving face according to claim 1, wherein the method for determining the length of the coal caving segment in the reverse order by the neural network system analysis module is as follows:
in the formula, p is the increase rate of the total coal discharge amount of the reverse-sequence coal discharge section,%;
Lrm is the length of the coal caving segment in the reverse order;
Qi' the coal discharge amount of the bracket I in the coal discharge period of the reverse coal discharge section, m3；
QiThe coal discharging amount of the bracket I in the coal discharging time period of the positive sequence coal discharging section is m3；
W is the length of the center distance of the coal caving bracket, m;
n is the total number of the coal caving supports of the fully mechanized caving face;
when the total coal caving amount growth rate p of the reverse-order coal caving segment reaches the maximum value, the length L of the reverse-order coal caving segment can be determinedr。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810889830.2A CN110821493B (en) | 2018-08-07 | 2018-08-07 | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810889830.2A CN110821493B (en) | 2018-08-07 | 2018-08-07 | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110821493A CN110821493A (en) | 2020-02-21 |
| CN110821493B true CN110821493B (en) | 2022-02-22 |
Family
ID=69533986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810889830.2A Active CN110821493B (en) | 2018-08-07 | 2018-08-07 | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110821493B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167012B (en) * | 2023-11-03 | 2024-01-23 | 中国矿业大学(北京) | Multi-wheel reverse sequence coal caving process for horizontal sectional fully-mechanized caving mining of steeply inclined coal seam |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2029086C1 (en) * | 1991-05-13 | 1995-02-20 | Институт физики и механики горных пород АН Республики Кыргызстан | Method for extraction of thick gently dipping seams through their full thickness with seams separated by clay intercalation |
| AU2314701A (en) * | 2000-02-20 | 2001-08-23 | Yankuang Group Corporation | Automatic hydraulic supports for top-coal caving |
| CN102434158A (en) * | 2011-11-21 | 2012-05-02 | 大同煤矿集团有限责任公司 | Two-segment dual-wheel sequential top-coal caving method |
| CN102691502A (en) * | 2012-05-22 | 2012-09-26 | 山东科技大学 | Method for improving recovery rate of fully mechanized top coal caving |
| CN104314599A (en) * | 2014-09-29 | 2015-01-28 | 天地科技股份有限公司 | Neutral network-based automatic coal drawing system and method for fully mechanized coal mining face |
-
2018
- 2018-08-07 CN CN201810889830.2A patent/CN110821493B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2029086C1 (en) * | 1991-05-13 | 1995-02-20 | Институт физики и механики горных пород АН Республики Кыргызстан | Method for extraction of thick gently dipping seams through their full thickness with seams separated by clay intercalation |
| AU2314701A (en) * | 2000-02-20 | 2001-08-23 | Yankuang Group Corporation | Automatic hydraulic supports for top-coal caving |
| CN102434158A (en) * | 2011-11-21 | 2012-05-02 | 大同煤矿集团有限责任公司 | Two-segment dual-wheel sequential top-coal caving method |
| CN102691502A (en) * | 2012-05-22 | 2012-09-26 | 山东科技大学 | Method for improving recovery rate of fully mechanized top coal caving |
| CN104314599A (en) * | 2014-09-29 | 2015-01-28 | 天地科技股份有限公司 | Neutral network-based automatic coal drawing system and method for fully mechanized coal mining face |
Non-Patent Citations (2)
| Title |
|---|
| 基于BBR体系的提高顶煤采出率工艺研究;张锦旺;《工程科技Ⅰ辑》;20180215;第B021-35页 * |
| 张锦旺.基于BBR体系的提高顶煤采出率工艺研究.《工程科技Ⅰ辑》.2018,第B021-35页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110821493A (en) | 2020-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104533416B (en) | Pole big thick ore body massive mechanical non-pillar sublevel caving mining methods | |
| WO2016206618A1 (en) | Longwall mine construction method n00 | |
| CN107829742B (en) | Caving-filling-open stope-caving mining method | |
| CN109209474B (en) | Method for extracting gas and accumulated water from coal seam and upper multi-goaf by double branch well | |
| AU2019226144B2 (en) | Internally injected replacement support room-type coal pillar recovery method | |
| CN101424186A (en) | Method for recovering disc ore on incline ore block | |
| WO2016127676A1 (en) | Combined method for excavating quarry stone | |
| CN111677509B (en) | Cooperative mining method for inclined thick and large ore body | |
| CN104358573B (en) | The stage open stope of big thick ore body and stage avalanche combined mining method | |
| CN110821493B (en) | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face | |
| AU2021101512A4 (en) | Panel area and panel area column collaborative mining method for an inclined thick and large ore body | |
| CN103726847B (en) | A kind of downhole jade ore deposit mining methods | |
| CN104088662A (en) | Construction method of gob-side entry retaining wall of solid filling coal mining | |
| US4458947A (en) | Mining method | |
| Fan et al. | Opencast to underground iron ore mining method | |
| CN110259450B (en) | Mining method for inclined-steeply inclined medium-thickness ore body | |
| CN104533417A (en) | Dual-system two-hardness short-wall coal seam mining method | |
| CN205036375U (en) | Fan -shaped back production medium -length hole of cut groove hanging arch is cut in processing | |
| Zhang et al. | Determination of cyclic filling length in gob-side entry retained with roadside filling and its application | |
| CN113530542B (en) | Open stoping subsequent filling mining method for thick and large ore body wedge-shaped top column in sectional rock drilling stage | |
| CN112963147B (en) | Medium-length hole blasting mining process for steeply inclined thin ore body | |
| CN104879128A (en) | Steep-dip ultra-thick coalbed mining technique based on top-coal advancing pre-detonation weakening | |
| CN109139015B (en) | Strip cutting type open stoping method | |
| CN108590658A (en) | A kind of bump and highly gassy mine exploiting field inner working face connect method for arranging | |
| CN108547615B (en) | Method for mining in complex ore body group by using trackless equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |