CN103993907A - Determining method of net hanging position at working face retracement stage under mine high-intensity exploiting - Google Patents
Determining method of net hanging position at working face retracement stage under mine high-intensity exploiting Download PDFInfo
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Abstract
The invention provides a determining method of a net hanging position at a working face retracement stage under mine high-intensity exploiting. By analyzing basic parameters such as working face periodic weighting step pitch and weighting position prediction parameters and flexible net length, three different computing expressions are established, according to the comparing results of the average periodic weighting step pitch, the weighting persistence length, the flexible net length and the minimum net hanging position, the average periodic weighting step pitch and the distance between a next periodic weighting starting position and a main retracement channel are put into a corresponding computing expression, and reasonable hanging net length is computed. According to the method, scientific and reasonable determining of the hanging net position is achieved, the fact that large weighting does not exist during fully-mechanized coal mining working face net hanging is guaranteed, the fact that net hanging work is safe and smooth is guaranteed, a guarantee is provided for safe production of the retracement stage, and meanwhile great guiding significance is achieved on determining of needed flexible net length of an enterprise.
Description
Technical field
The invention belongs to pit mining technical field, relate in particular to the lower work plane of a kind of mine high strength exploitation and withdraw stage linked network method for determining position.
Background technology
Coal in China output rank the first in the world, the coal production of 2012 approximately reaches 3,600,000,000 t.Although in recent years due to the economic slowdown in growth of China, coal production speedup glides, but coal still accounts for 70% left and right of Chinese primary energy, within coming few decades, China take coal and is that main energy resource structure can not change, consumption of coal total amount totally shows a rising trend, and therefore guarantees that coal production is for the development important in inhibiting of national economy.Shen Dong mining area belongs to super-huge national coal production base, because condition of coal seam occurrence is good, is applicable to building high-yield and high-efficiency mine, its fully mechanized coal face full-seam mining has reached 7.0m, face width reaches 300～450m, moves towards to advance length to reach 4500～6000m, and a day fltting speed is 10～20m/d.Fully-mechanized coalface under high strength exploitation is generally applied multichannel Quick-return Technology, and linked network is a procedure that withdraws stage necessity, and can the direct decision of linked network quality fast and safely withdraw.
There is no both at home and abroad at present and determine that fully mechanized coal face withdraws the scientific method of stage linked network position, determines linked network position according to Field Force's working experience mostly.Rule of thumb definite mode exists many defects, tends to appear at the situation that work plane is pressed place's linked network in actual mechanical process, thereby pressure rack accident even occurs to cause that work plane end face leaks to emit, and has had a strong impact on safety in production.
Lower each work plane of high strength exploitation has its unique geological conditions, so pressing of work plane be also not quite similar, and rule of thumb definite mode, can not be in the same way with very large error.The linked network scheme of other work plane of simple copy, tends to press place's linked network at work plane, causes the generation of roof fall pressure rack accident, thereby jeopardizes producers' safety, causes huge economic loss.
Summary of the invention
The object of the present invention is to provide the lower work plane of a kind of mine high strength exploitation to withdraw stage linked network method for determining position, be intended to solve the problem that under mine, linked network scheme error is large, safety factor is low.
The present invention is achieved in that the lower work plane of a kind of mine high strength exploitation withdraws stage linked network method for determining position, comprises the following steps:
S1, according to the lower work plane of high strength exploitation in the definite method that withdraws stage linked network rational position, to this work plane estimate for the last time periodic weighting original position, flexible net length, press persistence length, minimum linked network position basic parameter size compares, and summarizes the calculation expression of linked network position according to comparative result;
S2, according to the periodic weighting step pitch of last 4～6 times before work plane linked network, calculate press average period step pitch and next time periodic weighting original position apart from the distance of main return channel;
S3, according to described comparative result, by press average period step pitch and next time periodic weighting original position apart from the corresponding calculation expression of distance substitution of main return channel, calculate rational linked network length.
Preferably, in step S1, described calculation expression specifically comprises:
X＝X
min～X
0 (1)，
X＝L
Z+n×s (2)，
X＝L
Z-L
C (3)；
Wherein, in formula (1)～formula (3):
X---reasonable linked network length, m;
X
min---minimum linked network length, m;
X
0---flexible net physical length is maximum linked network length, m;
L
z---last periodic weighting original position is apart from the distance of main return channel, m;
L
c---periodic weighting persistence length, m;
N---redundancy, value 2～4;
S---coal-winning machine cuts dark, m;
In step (1), the relation between described comparative result and linked network position is specially:
(1) when last periodic weighting original position is less than minimum linked network length, selecting type (1);
(2) when last periodic weighting original position is greater than minimum linked network length but is less than flexible net length, selecting type (2);
(3) when last periodic weighting original position is greater than flexible net length but presses end position to be greater than minimum linked network length, selecting type (3);
(4) when last periodic weighting original position is greater than flexible net length but presses end position to be less than minimum linked network length, selecting type (2).
The present invention overcomes the deficiencies in the prior art, provide the lower work plane of a kind of mine high strength exploitation to withdraw stage linked network method for determining position, first the periodic weighting by analytical work face and press the basic parameters such as position prediction and flexible net length, 3 kinds of different calculation expressions have been set up, then according to pressing step pitch average period, press persistence length, flexible net length and minimum linked network position comparative result each other, to press average period step pitch and last periodic weighting original position in the corresponding calculation expression of distance substitution of main return channel, calculate rational linked network length.The present invention has realized scientific and reasonable the determining in linked network position, guarantees during fully-mechanized mining working linked network, without pressing greatly, to guarantee that the safety of linked network operation is smooth, for withdrawing the safety in production in stage, provides guarantee.The method determines that to enterprise required flexible net length has good directive significance simultaneously, and in view of a flexible net expense reaches millions of, if can save the flexible net length of 0.1～0.2 times, Neng Wei enterprise saves larger economic benefit.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps that the lower work plane of mine high strength exploitation of the present invention withdraws stage linked network method for determining position;
Fig. 2 withdraws stage linked network rational position to select schematic diagram in the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The lower work plane of mine high strength exploitation withdraws a stage linked network method for determining position, as shown in Figure 1, comprises the following steps:
S1, according to the lower work plane of high strength exploitation in the definite method that withdraws stage linked network rational position, to this work plane estimate for the last time periodic weighting original position, flexible net length, press persistence length, minimum linked network position basic parameter size compares, and summarizes the calculation expression of linked network position according to comparative result;
In step S1, as shown in Figure 2, the spatial relationship between related influence factor of linked network stage is uncertain, has three kinds of situations:
(1) last periodic weighting original position is less than minimum linked network length, i.e. L
z< X
min, now
X=X
min～X
0formula (1)
X---linked network position, linked network starting point is apart from the distance of main return channel, m.
Linked network position now can be in minimum linked network position to selecting arbitrarily between flexible net length, even because now minimum linked network distance is also positioned at outside nip territory, the safety in the time of can guaranteeing linked network is carried out smoothly.
(2) last periodic weighting original position is greater than minimum linked network length X
minbut be less than flexible net physical length X
0, i.e. X
min≤ L
z< X
0, now adopt formula 2 to calculate:
X=L
z+ n * s formula (2)
N---redundancy, gets 2～4, conventionally gets 3.
S---coal-winning machine cuts dark, m; Shen Dong mining area fully mechanized coal face coal machine cuts the dark 0.8m of being generally.
Why linked network position will press the distance of adding some sections of profound degree on the basis of original position, and reason is:
(a) in work plane coal cutting process, pressing last cutter often to occur the trend of pressing, face pressure generally strengthens during than non-pressure, also likely cause ore deposit to be pressed and manifest aggravation, unfavorable for playing the operations such as anchor cable before linked network, therefore must on minimum range basis, add that cutting of 1～2 cutter is dark;
(b) in actual mechanical process, linked network required time is longer, except maintenance crew, toward contact, takies the even more time of 1～2 class of production, shows to cause work plane to press in advance, therefore should separately add that cutting of 1～2 cutter is dark according to actual measurement statistics.
(3) last periodic weighting original position is greater than flexible net length X
0(maximum linked network distance) is L
z>=X
0time, now comprise following situation:
A, work as L
z-L
c>=X
mintime:
X=L
z-L
cformula (3)
L
c---press persistence length, m; Can press measured result to obtain according to ore deposit, Shen Dong mining area fully mechanized coal face periodic weighting persistence length be commonly 3～8s;
B, work as L
z-L
c< X
mintime:
X=L
z+ n * s formula (2)
Now flexible net length is less than linked network original position apart from the distance of return channel, and calculation expression is identical with formula 2, and the linked network curtailment part later stage should adopt wire lath to carry out continued access.
S2, according to the periodic weighting step pitch of last 4～6 times before work plane linked network, calculate press average period step pitch and next time periodic weighting original position apart from the distance of main return channel;
In step S2, the last periodic weighting step pitch L of 4～6 times before statistics linked network
1, L
2, L
3, L
4, L
5, L
6, calculate and press step pitch L average period.
According to the L calculating, predict periodic weighting position next time, the distance d of the main return channel of the original position of front periodic weighting distance deducts and presses step pitch L average period, draws the original position L of periodic weighting next time
z; Wherein, L
z=d-L.
S3, according to described comparative result, by press average period step pitch and next time periodic weighting original position apart from the corresponding calculation expression of distance substitution of main return channel, calculate rational linked network length.
Shortcoming and defect than prior art, the present invention has following beneficial effect: for by virtue of experience estimated the method for linked network position in the past, the present invention is first by the analysis of work plane periodic weighting with press position prediction and the basic parameter such as flexible net length, 3 kinds of different calculation expressions have been set up, realized scientific and reasonable the determining in linked network position, during guaranteeing fully-mechanized mining working linked network, nothing is pressed greatly, the safety that guarantees linked network operation is smooth, for withdrawing the safety in production in stage, provides guarantee.The method determines that to enterprise required flexible net length has good directive significance simultaneously, and in view of a flexible net expense reaches millions of, if can save the flexible net length of 0.1～0.2 times, Neng Wei enterprise saves larger economic benefit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the lower work plane of mine high strength exploitation withdraws a stage linked network method for determining position, it is characterized in that comprising the following steps:
S1, according to the lower work plane of high strength exploitation in the definite method that withdraws stage linked network rational position, to this work plane estimate for the last time periodic weighting original position, flexible net length, press persistence length, minimum linked network position basic parameter size compares, and summarizes the calculation expression of linked network position according to comparative result;
S2, according to the periodic weighting step pitch of last 4～6 times before work plane linked network, calculate press average period step pitch and next time periodic weighting original position apart from the distance of main return channel;
S3, according to described comparative result, by press average period step pitch and next time periodic weighting original position apart from the corresponding calculation expression of distance substitution of main return channel, calculate rational linked network length.
2. the lower work plane of mine high strength exploitation as claimed in claim 1 withdraws stage linked network method for determining position, it is characterized in that, in step S1, described calculation expression specifically comprises:
X＝X
min～X
0 (1)，
X＝L
Z+n×s (2)，
X＝L
Z-L
C (3)；
Wherein, in formula (1)～formula (3):
X---reasonable linked network length, m;
X
min---minimum linked network length, m;
X
0---flexible net physical length is maximum linked network length, m;
L
z---last periodic weighting original position is apart from the distance of main return channel, m;
L
c---periodic weighting persistence length, m;
N---redundancy, value 2～4;
S---coal-winning machine cuts dark, m;
In step (1), the relation between described comparative result and linked network position is specially:
(1) when last periodic weighting original position is less than minimum linked network length, selecting type (1);
(2) when last periodic weighting original position is greater than minimum linked network length but is less than flexible net length, selecting type (2);
(3) when last periodic weighting original position is greater than flexible net length but presses end position to be greater than minimum linked network length, selecting type (3);
(4) when last periodic weighting original position is greater than flexible net length but presses end position to be less than minimum linked network length, selecting type (2).
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|---|---|---|---|
| CN201410226320.9A CN103993907B (en) | 2014-05-26 | 2014-05-26 | Under a kind of mine high tension coal mining, working face withdraws stage linked network method for determining position |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397233A (en) * | 2018-03-12 | 2018-08-14 | 河南理工大学 | A kind of return channel that is easy to stays the Stope roof control method set |
-
2014
- 2014-05-26 CN CN201410226320.9A patent/CN103993907B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397233A (en) * | 2018-03-12 | 2018-08-14 | 河南理工大学 | A kind of return channel that is easy to stays the Stope roof control method set |
| CN108397233B (en) * | 2018-03-12 | 2019-10-25 | 河南理工大学 | A kind of return channel that is easy to stays the Stope roof control method set |
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