CN109882179B - Open-air end slope coal-pressing filling mining design method - Google Patents
Open-air end slope coal-pressing filling mining design method Download PDFInfo
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- 238000005065 mining Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 70
- 239000011435 rock Substances 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 239000000945 filler Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 claims 4
- 231100000817 safety factor Toxicity 0.000 claims 2
- 230000001687 destabilization Effects 0.000 abstract description 3
- 230000001066 destructive effect Effects 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 description 8
- 238000011105 stabilization Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention discloses a design method for open-pit end slope coal-pressing filling mining, which comprises the following steps: collecting end slope coal-pressing top plates and slope rock samples, and testing physical and mechanical parameters of the top plates and the slope rock samples; establishing a coal pillar-filling body cooperative control roof mechanical model, preliminarily setting the width of a coal pillar, the width of a roadway and the filling rate, and judging the stability of the coal-pressing roof; after the stope roof is stabilized, establishing a slope numerical simulation model, substituting design values of coal pillar width, excavation width and filling rate which meet the stability condition of the coal-pressing roof, and judging the stability of the open-air end slope; and determining final design values of the coal pillar width, the roadway driving width and the filling rate based on the design values of the coal pillar width, the roadway driving width and the filling rate which meet the stability condition according to the storage capacity of the actual filling body. The method effectively solves the problem of destabilization of the lower end slope caused by disturbance of open-air end slope coal pressing mining, can avoid destructive influence on the end slope caused by rock mass movement after coal pressing mining, and has strong practical operability, simple method and reasonable scheme design.
Description
Technical Field
The invention belongs to the technical field of mining design, and particularly relates to an open-air end slope coal-pressing filling mining design method suitable for slope instability damage prevention, in particular to an open-air end slope coal-pressing filling mining design method.
Background
In recent years, in order to avoid the problems of resource waste, ignition and the like, the end slope coal pressing of the opencast coal mine gradually becomes the object of mining of coal enterprises, and the mining of the coal resources at the end slope inevitably causes the stress redistribution of rock masses, so that the movement and deformation of the end slope rock masses are caused, the stability of the end slope is further influenced, and the filling mining method can be tentatively adopted for mining the coal resources and protecting the stability of the end slope. The filling method can effectively control the movement of the rock stratum, but can not completely avoid the movement of the rock stratum, and the upper engineering cannot be destructively influenced as long as the deformation of the overlying rock stratum can be controlled within a certain range. Therefore, the judgment of the slope stability and the filling design in the process of exploiting the open-pit end slope coal pressing by using the filling method have important significance.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a design method for open-air end slope coal-pressing filling mining, which solves the problem of destabilization of a lower end slope caused by disturbance of open-air end slope coal-pressing mining and can avoid destructive influence on the end slope caused by movement of a rock mass after coal-pressing mining.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
the design method for open-pit end slope coal-pressing filling mining comprises the following steps:
(1) collecting end slope coal-pressing top plates and slope rock samples, and testing physical and mechanical parameters of the top plates and the slope rock samples;
(2) establishing a coal pillar-filling body cooperative control roof mechanical model, preliminarily setting the width of a coal pillar, the width of a roadway and the filling rate, and judging the stability of the coal-pressing roof;
(3) after the stope roof is stabilized, establishing a slope numerical simulation model, substituting design values of coal pillar width, excavation width and filling rate which meet the stability condition of the coal-pressing roof, and judging the stability of the open-air end slope;
(4) and determining final design values of the coal pillar width, the roadway driving width and the filling rate based on the design values of the coal pillar width, the roadway driving width and the filling rate which meet the stability condition according to the storage capacity of the actual filling body.
The step (2) comprises the following specific steps:
a. establishing a coal pillar-filler cooperative control top plate mechanical model by taking a rotation point O of the top plate as an origin of coordinates, taking a pushing direction vertical to a working surface as an x axis and a vertical sinking direction of the top plate as a w axis;
b. calculating the maximum tensile stress sigma of the cross section of the top platemax；
Wherein k iscIs the coefficient of the coal body bed,
the filling rate is used.
c. Judging whether the coal pressing top plate is broken or not by adopting a first strength theory (maximum tensile stress theory);
σmax≤σt
wherein σtThe tensile strength of the top plate.
d. If the coal pressing top plate is not broken, performing the step (3); otherwise, according to the storage amount of the filling body, the coal pillar width, the roadway driving width and the filling rate are properly adjusted, and the step (2) is carried out again.
The step (3) comprises the following specific steps:
a. establishing an open-pit end slope coal-pressing filling mining numerical model;
b. substituting design values of coal pillar width, roadway driving width and filling rate meeting the stability condition of the coal-pressing top plate, calculating the slope safety factor Fs of filling mining by using a finite element reduction method, and judging whether the open-air end slope is stable;
Fs≥Ks
wherein, KsAnd designing a safety factor for slope stability.
c. If the open end slope is stable, performing the step (4); otherwise, according to the storage amount of the filling body, the coal pillar width, the roadway driving width and the filling rate are properly adjusted, and the step (2) is carried out again.
Has the advantages that: by adopting the technical scheme, the mechanical model of the coal pillar-filling body cooperative control top plate is established, the stability of the coal-pressing top plate is judged by adopting the strength theory, the stability of the open-air end slope is judged by a finite element reduction method, and finally the final design values of the coal pillar width, the roadway driving width and the filling rate are determined according to the storage capacity of the filling body, so that the design of coal-pressing filling mining is further carried out. The method effectively solves the problem of destabilization of the lower end slope caused by disturbance of open-air end slope coal pressing mining, can avoid destructive influence on the end slope caused by rock mass movement after coal pressing mining, and has strong practical operability, simple method and reasonable scheme design. Have wide applicability in the field.
Drawings
FIG. 1 is a flow chart of a design method for open-pit end slope coal caving cut filling of the present invention;
FIG. 2 is a mechanical model diagram of a coal pillar-filler cooperative control roof according to the present invention.
FIG. 3 is a diagram of an example numerical simulation model of the present invention.
Fig. 4 is a graph showing an example of determining the slope safety factor of the present invention.
In the figure: l iscIs the width of coal body, LbFor pack width, q is the load of overburden on the roof, qcSupporting loads of the roof for the coal body, qbAnd h is the mining height, w (x) is the sinking deflection of the top plate, and x is the horizontal distance from the origin of coordinates O.
Detailed Description
The invention is further described with reference to the following figures and examples.
The process flow of the invention is shown in FIG. 1.
Carrying out end slope pressing coal mining on a certain opencast coal mine of inner Mongolia Ordos, burying a main mining coal layer IV-2 with the depth of 85m, average pressing coal thickness of 3.4m, pressing coal top plate being siltstone, and tensile strength sigma of the top platet＝1.98×107Pa, adopting a progressive filling mining mode, mining the height of 3.4m, digging the roadway with the width of 4.4m, and reserving a coal pillar of 5m (see table 1). The end slope coal-pressing top plate and the slope rock sample are collected firstly, and the physical and mechanical parameters of the top plate and the slope rock sample are tested (see table 1).
TABLE 1 initial design values for filling coal mining
And (3) establishing a coal pillar-filling body cooperative control roof mechanical model and judging the stability of the coal-pressing roof.
And (3) establishing a top plate sinking mechanical model in a filling state by taking the rotation point O of the top plate as the origin of coordinates, the pushing direction perpendicular to the working surface as an x axis and the top plate sinking direction perpendicular to the working surface as a w axis (see figure 2).
Wherein k iscIs the coefficient of the coal body bed,
for the fullness, q is overburden loading, E is the modulus of elasticity, I is the moment of inertia of the roof section, h is the mining height, LcIs the width of coal pillar, LbFor width of roadway driving, kcThe coal bed coefficient.
And (4) judging whether the coal pressing top plate is broken or not by adopting a first strength theory (maximum tensile stress theory).
σmax≤σt(2)
Obtaining the maximum tensile stress sigma of the coal-pressing top plate according to a discrimination calculation formulamax＝2.11×107Pa≥σt＝1.98×107Pa, if the top coal is broken, the width of the coal pillar, the width of the roadway driving and the filling rate need to be properly adjusted according to the filling amount.
Selecting different coal pillar widths, roadway driving widths and filling rates, and judging the stability of the coal-pressing top plate (see table 2).
TABLE 2 filling coal mining parameter selection
| Scheme(s) | Width of coal pillar | Width of tunnel digging | Filling rate | Maximum tensile stress | Roof stability |
| 1 | 5 | 4.4 | 70 | 2.10×107 | Instability of the film |
| 2 | 5 | 4.4 | 90 | 2.03×107 | Instability of the |
| 3 | 5 | 4.4 | 95 | 1.94×107 | |
| 4 | 5 | 4.4 | 97 | 1.83×107 | Stabilization |
| 5 | 5 | 4.6 | 60 | 2.02×107 | Instability of the |
| 6 | 5 | 4.8 | 60 | 1.95×107 | |
| 7 | 5 | 5 | 60 | 1.89×107 | |
| 8 | 5 | 5.2 | 60 | 1.84×107 | Stabilization |
| 9 | 5.2 | 4.4 | 60 | 2.03×107 | Instability of the |
| 10 | 5.4 | 4.4 | 60 | 1.95×107 | |
| 11 | 5.6 | 4.4 | 60 | 1.87×107 | |
| 12 | 5.8 | 4.4 | 60 | 1.80×107 | Stabilization |
From table 2, it can be seen that schemes 3, 4, 6, 7, 8, 10, 11, and 12 are feasible.
And (3) establishing a numerical model of open-pit end slope coal-pressing filling mining (see figure 3).
Substituting the design values of the coal pillar width, the roadway driving width and the filling rate of the schemes 3, 4, 6, 7, 8, 10, 11 and 12, and calculating the slope safety coefficient F of filling mining by using a finite element reduction methods(see FIG. 4).
From fig. 4, it can be seen that schemes 4, 7, 8, 11, and 12 are possible. As the actual filling body storage capacity of the open-pit coal mine is rich, the scheme 4 is selected as the final design values of the coal pillar width, the roadway driving width and the filling rate, namely the roadway driving width is 4.4m, 5m coal pillars are reserved, and the filling rate is 97%.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A design method for open-pit end slope coal-pressing filling mining is characterized by comprising the following steps: the method comprises the following steps:
(1) collecting end slope coal-pressing top plates and slope rock samples, and testing physical and mechanical parameters of the top plates and the slope rock samples;
(2) establishing a coal pillar-filling body cooperative control roof mechanical model, preliminarily setting the width of a coal pillar, the width of a roadway and the filling rate, and judging the stability of the coal-pressing roof, wherein the concrete steps are as follows:
a. establishing a coal pillar-filler cooperative control top plate mechanical model by taking a rotation point O of the top plate as an origin of coordinates, taking a pushing direction vertical to a working surface as an x axis and a vertical sinking direction of the top plate as a w axis;
b. calculating the maximum tensile stress sigma during roof filling miningmax；
c. Judging whether the coal pressing top plate is broken or not by adopting a first strength theory;
d. if the coal pressing top plate is not broken, performing the step (3); otherwise, according to the storage amount of the filling body, properly adjusting the width of the coal pillar, the tunneling width and the filling rate, and repeating the step (2);
(3) building a slope numerical simulation model, substituting design values of coal pillar width, tunneling width and filling rate meeting the stability condition of the coal-pressing top plate, and judging the stability of the open-air end slope, wherein the method comprises the following specific steps:
a. establishing a numerical model of open-pit end slope coal caving filling mining by using Flac 3D;
b. substituting the design values of the coal pillar width, the tunneling width and the filling rate which meet the stability condition of the coal-pressing top plate, and calculating the slope safety coefficient F of filling mining by using a finite element reduction methodsJudging whether the open end slope is stable or not;
c. if the open end slope is stable, performing the step (4); otherwise, according to the storage amount of the filling body, properly adjusting the width of the coal pillar, the tunneling width and the filling rate, and repeating the step (2);
(4) and determining final design values of the coal pillar width, the roadway driving width and the filling rate based on the design values of the coal pillar width, the roadway driving width and the filling rate which meet the stability condition according to the storage capacity of the actual filling body.
2. The design method for open-pit end slope pack coal pack filling mining of claim 1, wherein the maximum tensile stress σ ismaxThe calculation method comprises the following steps:
wherein k iscIs the coefficient of the coal body bed,
for the fullness, q is overburden loading, E is the elastic modulus of the roof, I is the moment of inertia of the roof cross section, h is the mining height, LcIs the width of coal pillar, LbFor width of roadway driving, kcThe coal bed coefficient.
3. The design method for open-pit end slope coal-pressing filling mining according to claim 1, wherein the method for judging whether the coal-pressing top plate is broken comprises the following steps:
σmax≤σt
wherein σtThe tensile strength of the top plate.
4. The open-pit end slope coal-pressing filling mining design method according to claim 1, wherein the method for determining whether the open-pit end slope is stable is as follows:
Fs≥Ks
wherein, FsFor safety factors of the side slope, KsAnd designing a safety factor for slope stability.
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| CN111396055B (en) * | 2020-03-24 | 2021-03-30 | 中煤科工集团沈阳设计研究院有限公司 | Method for arranging side coal pressing mining chamber of strip mine |
| CN113420457B (en) * | 2021-07-08 | 2024-03-19 | 辽宁工程技术大学 | End slope stability analysis method for steep slope mining of open pit coal mine |
| CN114580205B (en) * | 2022-04-08 | 2024-04-26 | 辽宁工程技术大学 | Calculation method for width of inelastic zone of end slope filling mining coal pillar |
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