CN113323666B - Method for mining backup of open pit coal mine in seasonal frozen soil area - Google Patents
Method for mining backup of open pit coal mine in seasonal frozen soil area Download PDFInfo
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- CN113323666B CN113323666B CN202110729270.6A CN202110729270A CN113323666B CN 113323666 B CN113323666 B CN 113323666B CN 202110729270 A CN202110729270 A CN 202110729270A CN 113323666 B CN113323666 B CN 113323666B
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- 239000003245 coal Substances 0.000 title claims abstract description 94
- 239000002689 soil Substances 0.000 title claims abstract description 83
- 238000005065 mining Methods 0.000 title claims abstract description 34
- 230000001932 seasonal effect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009412 basement excavation Methods 0.000 claims abstract description 6
- 238000010257 thawing Methods 0.000 claims description 4
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000011435 rock Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/26—Methods of surface mining; Layouts therefor
- E21C41/28—Methods of surface mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a backup mining method for an open pit coal mine in a seasonal frozen soil area, which comprises the following steps: calculating the stability of the coal end slope before mining; when the stability coefficient of the end slope of the coal before mining is larger than a preset coefficient, in a slope mechanical model combining the frozen soil area and the frozen soil mechanical property, the flat disc width of the coal step at the lower part of the end slope is obtained by simulating and changing the flat disc width of the coal step at the lower part of the end slope, when the coal step is excavated, the flat disc width of the coal step at the lower part of the end slope after excavation is enabled to be equal to the flat disc width obtained by simulating, and the stability of the end slope is timely improved by inner pressure discharging slope before the freezing period of the slope is finished.
Description
Technical Field
The invention relates to an open pit coal mining method, in particular to a backup mining method for an open pit coal mine in a seasonal frozen soil area.
Background
Along with the gradual shift of the gravity center of coal resource exploitation in China to the China and the western region, the coal seam occurrence condition is shallow and the coal seam is thicker, so that the method is suitable for surface exploitation, the ratio of the surface exploitation of coal productivity is increased year by year, and the ratio of the surface exploitation of coal productivity in the Xinjiang region is over 50 percent. Under the existence condition of a thick coal seam, the end slope of the strip mine is huge in coal pressing quantity, and the extremely waste of coal resources is caused. In the existing traditional mining design, the stability of the side slope is static, and the influence of external factors such as temperature, water and the like on the stability of the side slope is not considered from the physical and mechanical parameters of the side slope rock mass. Under the condition of high-cold weather in the Xinjiang area, the slope rock stratum of the stope of the open pit coal mine is influenced by the extremely-cold weather, and the slope stability of the stope of the open pit coal mine is higher in winter, so that the open pit coal mine mining method for safely and efficiently recycling coal resources by utilizing the characteristics of the slope rock stratum in the period can be invented.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for mining the highwall of an open pit coal mine in a seasonal frozen soil area, which can realize safe and efficient recovery of coal resources.
In order to achieve the purpose, the method for mining the backup of the open pit coal mine in the seasonal frozen soil area comprises the following steps:
calculating the stability of the coal end slope before mining;
When the stability coefficient of the end slope of the coal before mining is larger than a preset coefficient, in a slope mechanical model combining the frozen soil area and the frozen soil mechanical property, the flat disc width of the coal step at the lower part of the end slope is obtained by simulating and changing the flat disc width of the coal step at the lower part of the end slope, and when the coal step is excavated, the flat disc width of the coal step at the lower part of the end slope after excavation is equal to the flat disc width obtained by simulating;
The stability of the end slope is improved by pressing the slope of the inner dumping site before thawing in the frozen soil area in winter.
The specific operation for obtaining the stability coefficient of the coal end slope before mining is as follows:
acquiring the frozen soil depth of an opencut coal mine in a seasonal frozen soil area;
acquiring mechanical parameters of frozen soil of each stratum of the end slope of the opencast coal mine;
Establishing a slope mechanical model combining the frozen soil area and the frozen soil mechanical property;
and calculating the stability coefficient of the end slope of the coal before mining by using a slope mechanical model according to the frozen soil depth of the open pit coal in the seasonal frozen soil area and the mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal.
The preset coefficient is equal to 1.1.
The concrete operation for acquiring the frozen soil depth of the open pit coal mine in the seasonal frozen soil area comprises the following steps:
And when the ground temperature is less than or equal to the preset temperature and the soil starts to freeze, measuring the depth of the frozen soil once at the preset time every day until the soil is completely thawed.
The preset temperature is 0 ℃.
The preset time is eight am.
The mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal mine comprise the weight G of the rock-soil body, the cohesive force C and the internal friction angle phi.
And obtaining the mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal mine through experiments.
The invention has the following beneficial effects:
According to the method for mining the side wall of the open pit coal mine in the seasonal frozen soil area, when the method is specifically operated, the flat plate width of the coal step at the lower part of the side wall is changed through simulation, so that the flat plate width of the coal step at the lower part of the side wall after excavation is equal to the flat plate width obtained through simulation when the coal step is excavated, and the safety of steep side wall mining is ensured to the greatest extent; the coal steps are excavated in winter, the inner row of the side slope is timely pressed before the side slope is thawed in spring, the side slope angle of the side slope can be improved on the premise of guaranteeing the stability of the side slope, the residual coal of the side slope is recovered, the stripping ratio is reduced, the transportation cost is reduced, the safe and efficient recovery of coal resources is realized, and the side slope has the advantages of low application cost, good economic effect and the like, and has wide practicability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the application. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the application.
Referring to fig. 1, the method for mining the highwall of the open pit coal mine in the seasonal frozen soil area comprises the following steps:
acquiring the frozen soil depth of an opencut coal mine in a seasonal frozen soil area;
obtaining mechanical parameters of frozen soil of each stratum of the end slope of the open pit coal mine through a test;
Establishing a slope mechanical model combining the frozen soil area and the frozen soil mechanical property;
Calculating the stability coefficient of the end slope of the coal before mining by utilizing a slope mechanical model according to the frozen soil depth of the open pit coal mine in the seasonal frozen soil area and the mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal mine;
When the stability coefficient of the end slope of the coal before mining is larger than a preset coefficient, in a slope mechanical model combining the frozen soil area and the frozen soil mechanical property, the flat disc width of the coal step at the lower part of the end slope is obtained by simulating and changing the flat disc width of the coal step at the lower part of the end slope, and when the coal step is excavated, the flat disc width of the coal step at the lower part of the end slope after excavation is equal to the flat disc width obtained by simulating.
The stability of the end slope is improved by pressing the slope of the inner dumping site before thawing in the frozen soil area in winter.
The preset coefficient is equal to 1.1.
The concrete operation for acquiring the frozen soil depth of the open pit coal mine in the seasonal frozen soil area comprises the following steps:
When the ground temperature is less than or equal to 0 ℃, and the soil starts to freeze, the soil freezing depth is measured once at eight am points every day until the soil is completely thawed.
The mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal mine comprise the weight G of the rock-soil body, the cohesive force C and the internal friction angle phi.
The coal steps are excavated, the flat disc width of the coal steps at the lower part of the end slope is reduced in the period of forming a frozen soil area in winter, the stability coefficient is 1.10, and the stability control condition of the slope exploitation is calculated by adopting a limit balance method.
The invention relates to a backup mining system for an open pit coal mine in a seasonal frozen soil area, which comprises the following components:
The first acquisition module is used for acquiring the frozen soil depth of the open pit coal mine in the seasonal frozen soil area;
The second acquisition module is used for acquiring mechanical parameters of frozen soil of each stratum of the end slope of the open pit coal mine through a test;
The construction module is used for establishing a slope mechanical model combining the frozen soil area and the frozen soil mechanical property;
the calculation module is used for calculating the stability coefficient of the end slope of the coal before mining by utilizing the slope mechanical model according to the frozen soil depth of the open pit coal in the seasonal frozen soil area and the mechanical parameters of frozen soil of each stratum of the end slope of the open pit coal;
the data processing module is used for obtaining the flat disc width when the stability coefficient is the preset coefficient by simulating and changing the flat disc width of the coal step at the lower part of the end slope in a slope mechanical model combining the frozen soil area and the frozen soil mechanical property when the stability coefficient of the end slope of the coal before mining is larger than the preset coefficient, and enabling the flat disc width of the coal step at the lower part of the end slope after excavation to be equal to the flat disc width obtained by simulation when the coal step is excavated;
the side pressing control module is used for improving the stability of the end side slope through side pressing of the inner dumping site before thawing in the frozen soil area in winter.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (7)
1. The method for mining the backup of the open pit coal mine in the seasonal frozen soil area is characterized by comprising the following steps of:
calculating the stability of the coal end slope before mining;
When the stability coefficient of the end slope of the coal before mining is larger than a preset coefficient, in a slope mechanical model combining the frozen soil area and the frozen soil mechanical property, the flat disc width of the coal step at the lower part of the end slope is obtained by simulating and changing the flat disc width of the coal step at the lower part of the end slope, and when the coal step is excavated, the flat disc width of the coal step at the lower part of the end slope after excavation is equal to the flat disc width obtained by simulating;
The stability of the end slope is improved by pressing the slope of the inner dumping site before thawing in the frozen soil area in winter;
The specific operation for obtaining the stability coefficient of the coal end slope before mining is as follows:
acquiring the frozen soil depth of an opencut coal mine in a seasonal frozen soil area;
acquiring mechanical parameters of frozen soil of each stratum of the end slope of the opencast coal mine;
Establishing a slope mechanical model combining the frozen soil area and the frozen soil mechanical property;
and calculating the stability coefficient of the end slope of the coal before mining by using a slope mechanical model according to the frozen soil depth of the open pit coal in the seasonal frozen soil area and the mechanical parameters of the frozen soil of each stratum of the end slope of the open pit coal.
2. The method of mining an open pit coal mine highwall in a seasonal frozen earth area of claim 1, wherein the predetermined coefficient is equal to 1.1.
3. The method for the backup mining of the open pit coal mine in the seasonal frozen soil area according to claim 1, wherein the concrete operation of acquiring the frozen soil depth of the open pit coal mine in the seasonal frozen soil area is as follows:
And when the ground temperature is less than or equal to the preset temperature and the soil starts to freeze, measuring the depth of the frozen soil once at the preset time every day until the soil is completely thawed.
4. A method of mining an open cut coal mine highwall in a seasonal frozen earth area according to claim 3, wherein the predetermined temperature is 0 ℃.
5. A method of mining a highwall in an opencut in a seasonal frozen earth area according to claim 3, wherein the predetermined time is eight am.
6. The method for mining the highwall of the open pit coal mine in the seasonal frozen soil area according to claim 1, wherein the mechanical parameters of the frozen soil of each stratum of the highwall slope of the open pit coal mine comprise the weight G of the rock-soil body, the cohesive force C and the internal friction angle phi.
7. The method for mining the highwall of the open pit coal mine in the seasonal frozen soil area according to claim 1, wherein the mechanical parameters of frozen soil of each stratum of the highwall of the open pit coal mine are obtained through experiments.
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