CN103790628A - Warning evaluation method for fully mechanized mining face roof disasters - Google Patents
Warning evaluation method for fully mechanized mining face roof disasters Download PDFInfo
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- CN103790628A CN103790628A CN201310213240.5A CN201310213240A CN103790628A CN 103790628 A CN103790628 A CN 103790628A CN 201310213240 A CN201310213240 A CN 201310213240A CN 103790628 A CN103790628 A CN 103790628A
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Abstract
Disclosed is a warning evaluation method for fully mechanized mining face roof disasters. The method includes: dividing fully mechanized mining face roof disaster levels into three classes of secure, less dangerous and dangerous; establishing evaluation indexes including setting load p0, resistance increase rate deltap<b>, mining face advance speed v, roof weighting step Pe and security valve opening ratio k; acquiring values of setting load benchmark indexes p1 and p2, resistance increase rate benchmark indexes gamma1 and gamma2, roof weighting step benchmark indexes P1 and P2, mining face advance speed benchmark indexes v1 and v2 and security valve opening ratio benchmark indexes k1 and k2 by means of making statistics and analysis of mining data of a tested fully mechanized mining face; when the disaster level corresponding to any one of the indexes is dangerous, considering the fully mechanized mining face roof disaster level as dangerous. The warning evaluation method is scientific, effective, high in accuracy and convenient for production technicians to propose measures for relieving danger timely and effectively, and damage and harm caused by roof disasters are avoided.
Description
Technical field
The present invention relates to a kind of coal mine roof plate Hazard Assessment method, particularly relate to a kind of roof of coal face disaster alarm evaluation method.
Background technology
In Coal Mine Disasters, roof accident is for mine main or capital construction mine is all multiple accident, and safety in production, construction harmfulness to mine are very big.For increasing top board disaster accident, mine pressure monitoring system or Roof Monitor system have also obtained application more and more widely gradually.But in fact, along with China's coal-mine integration in recent years puts more effort, reduce rapidly in the poor little colliery of non-support or supporting quality, but the frequency that roof accident occurs still keeps high-order.Mainly there is the following aspects reason in this:: the one, high strength stope is more and more, many coal mining enterprises are the in the situation that of conditions permit, all adopt large mining height overlength work plane and super large advance distance production technique, make face roof be caving rule press rule with ore deposit under traditional exploitation method compared with generation significant change; The 2nd, the dark seam mining mine of western shallow-reserved, exploitation work plane proportion are increasing, and the ore deposit that shallow overburden thick coal-layer mining presents presses rule also to lack the research deep compared with system.
Based on above reason, Roof Monitor work is forced to day by day to systematization, densification development, make every effort to by a large scale, high density, high digital monitoring is realized the Accurate Prediction prevention to top board disaster, but in fact, due to generation and the top board displacement of top board disaster, STRESS VARIATION is not simple linear relationship, so, although the generation by direct monitoring and forecasting prevention top board disaster has fabulous real-time, but accuracy is poor, roof accident takes place frequently at present, top board disaster is still that in coal production, one of several major casualties are exactly strong proof, and because top board disaster has comprised pressure rack, cut top, the particular types such as roof fall and roof weighting impact, only rely on monitoring instrument monitoring also cannot effectively distinguish Disasters Type, and provide guidance timely to formulating danger releasing measures.
If want top board hazard prediction prevention realizing and breaking through, the preventive works of top board hazard prediction should only not only limit to rely on the direct monitoring of monitoring instrument, although monitoring instrument, in continuous upgrading, and should be carried out in conjunction with monitoring means by scientific evaluation method.Evaluation method will accomplish that science is accurate, and core still will be set up the appraisement system of a set of science, comprising definite method of disaster grade separation, evaluation index and a reference value.
Summary of the invention
The invention provides a kind of roof of coal face disaster alarm evaluation method, solved current roof of coal face disaster alarm poor accuracy, separate danger not in time, the poor technical problem of validity.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of roof of coal face disaster alarm evaluation method, is divided into safe, more dangerous, dangerous three classes by roof of coal face disaster grade; Set up evaluation index, described evaluation index comprises setting load p
0, increase resistance ratio Δ p
b, face propulsion speed v, press step pitch Pe and safety valve to open ratio k; Described setting load p
0, increase resistance ratio Δ p
bwith press step pitch Pe all to move frame cycle period based on fully-mechanized mining working surface hydraulic support, set up Mathematical Modeling obtain; The monitoring information that described safety valve is opened ratio k to be provided according to monitoring instrument obtains, and described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support; Described face propulsion speed v determines by described fully-mechanized mining working exploitation actual conditions; Described setting load reference index is p
1and p
2, described increasing resistance ratio reference index is γ
1and γ
2, the described step pitch reference index of pressing is P
1and P
2, described face propulsion speed reference index is v
1and v
2, described safe opening ratio reference index is k
1and k
2; Described reference index p
1and p
2, γ
1and γ
2, P
1and P
2, v
1and v
2, k
1and k
2value all by test fully-mechanized mining working production data, analytic statistics obtains; The criterion that judges top board disaster grade according to described every evaluation index is as shown in the table:
In the time that the corresponding disaster grade of described any one evaluation index is danger, described roof of coal face disaster grade is danger.
In above-mentioned Alarm Assessment method, evaluation index also comprises post lack of uniformity dp before and after hydraulic support, and before and after described hydraulic support, post lack of uniformity dp is obtained by design formulas below:
Wherein, p
before, p
after, p
hbe respectively described hydraulic support front pillar, rear pillar working resistance and described hydraulic support yield load;
The monitoring information that described front and back post lack of uniformity dp provides according to monitoring instrument obtains, described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support, described front and back post lack of uniformity reference index is α and β, and described reference index α and β are all by test fully-mechanized mining working production data, analytic statistics obtains; The criterion adopting is as shown in the table:
In above-mentioned Alarm Assessment method, the Mathematical Modeling of calculating described increasing resistance ratio is:
Wherein, p
mfor described fully-mechanized mining working surface hydraulic support end resistance, p
0for described fully-mechanized mining working surface hydraulic support initial resistance, T is a circulation timei, p
hfor described fully-mechanized mining working surface hydraulic support yield load.
In above-mentioned Alarm Assessment method, pressing step pitch is by Compressive Strength threshold p recently
twith the working surface hydraulic support last resistance p that circulates
msize is determined, is carried out Compressive Strength threshold p
tdesign formulas is:
Wherein,
for respectively the circulate average of last resistance of described fully-mechanized mining working surface hydraulic support; p
tifor the circulation end resistance of each circulation; σ
pthe mean square deviation of last resistance average circulates.
The described fully-mechanized mining working surface hydraulic support last resistance p that circulates
mbe greater than to come Compressive Strength threshold p
ttime, be considered as fully-mechanized mining working generating period and press, according in former and later two periodic weightings interval times, the distance that fully-mechanized mining working advances calculates to arrive presses step pitch P
e.
In above-mentioned Alarm Assessment method, the number of described test fully-mechanized mining working should be no less than two.
In above-mentioned Alarm Assessment method, in the time calculating described safety valve unlatching ratio k, the number of the described fully-mechanized mining working surface hydraulic support of choosing is no less than 10% of sum.
In above-mentioned Alarm Assessment method, calculating setting load p
0, increase resistance ratio Δ p
bduring with front and back post lack of uniformity dp, the number of the described fully-mechanized mining working surface hydraulic support of choosing is no less than 10% of sum, and the value obtaining is average.
In above-mentioned Alarm Assessment method, calculating describedly while pressing step pitch Pe, the described fully-mechanized mining working periodic weighting number of times of choosing is no less than three times, and the value obtaining is average.
In above-mentioned Alarm Assessment method, described evaluation index also comprises any two safety valve opening support spacing distance K
d, time unlatching rate K
twith circulation unlatching rate K
c.
Described time unlatching rate K
trefer to that the time of an ON cycle internal safety valve unlatching overflow accounts for the percentage of total cycle time.Described circulation unlatching rate K
crefer to that the circulation of safety valve overflow accounts for the percentage of total observation cycle number.
Described any two safety valve opening support spacing distance K
d, time unlatching rate K
twith circulation unlatching rate K
cthe monitoring information providing according to monitoring instrument obtains, and described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support.
Described any two safety valve opening support spacing distance reference index K
d1and K
d2, described time unlatching rate reference index K
t1and K
t2, described circulation unlatching rate reference index K
c1and K
c2all by test fully-mechanized mining working production data, analytic statistics obtains; The criterion adopting is as shown in the table:
Technique scheme of the present invention has the following advantages compared to existing technology:
1. roof of coal face disaster alarm evaluation method provided by the invention, owing to having adopted multinomial evaluation index, top board disaster degree of danger is carried out to evaluation analysis, and the evaluation index a reference value adopting is all the statistics obtaining based in mining theory and mining Practice, therefore, the present invention has more science, has more accuracy.
2. roof of coal face disaster alarm evaluation method provided by the invention, due to evaluation index has been carried out selecting targetedly according to the concrete division of top board disaster, therefore, the present invention can be on the basis of early warning, instruct the concrete Disasters Type reflecting for different evaluation index about mine production technology personnel, take timely and effectively danger releasing measures, loss and the harm of avoiding top board disaster to cause.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the working resistance change curve during certain frame hydraulic moving stand of drawing according to the data of monitoring instrument monitoring in embodiment.
In figure, Reference numeral is expressed as: the 1-longitudinal axis (working resistance/MPa), 2-transverse axis (time/s), and 3-hydraulic support working resistance change curve, during 4-moves frame, 5-setting load point, 6-end resistance point.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
In the present embodiment, certain coal mining work plane is comprehensive extracting and caving face.
In the present embodiment, described fully-mechanized mining working surface hydraulic support is installed 100 altogether, and yield load is 40MPa.On every 5 described fully-mechanized mining working surface hydraulic supports, arrange that the working resistance during a monitoring instrument is to hydraulic moving stand carries out Real-Time Monitoring, monitor altogether 20.Monitoring period is 60.
Shown in Fig. 1 is the working resistance change curve during certain frame hydraulic moving stand of drawing according to monitoring instrument monitored data.
According to monitored data, the average of 20 average last resistances of the each circulation of monitoring hydraulic support is 26MPa, and the mean square deviation of average is 2.6MPa, and carrying out Compressive Strength threshold is 28.6MPa.According to carrying out the judgement of Compressive Strength threshold, through 60 circulations, fully-mechanized mining working advances 60m altogether, and generating period is pressed 3 times altogether, and on average pressing step pitch is 18m.
In the present embodiment, be 3 for calculating the test face of reference index value, statistical analysis obtains setting load p
0, increase resistance ratio Δ p
b, face propulsion speed v, press step pitch P
eopening the each reference index of ratio k with safety valve is worth as shown in the table.
According to the loop-around data of monitoring, the average that calculates the average setting load of the each circulation of described hydraulic support of 20 monitorings is 16.8MPa.
According to formula
with the loop-around data of monitoring, calculating 20 average averages that increase resistance ratio of the each circulation of monitoring hydraulic support is 8%.
According to the loop-around data of monitoring, 20 of monitoring described Safety Valve for Hydraulic Powered Supports to be opened to ratio k and add up, the average of each each circulation unlatching ratio is 19%.
According to actual measurement, fully-mechanized mining working fltting speed average out to 4m/ days in exploitation.
By the described setting load p calculating
0, increase resistance ratio Δ p
b, face propulsion speed v, press step pitch P
eopen ratio k with safety valve, the each evaluation index a reference value obtaining with statistics compares, and can obtain: p
2> p
0,
,
, P
1< P
e≤ P
2, k > k
2.
Contrast evaluation criteria table, described setting load p
0it is all dangerous opening top board disaster grade corresponding to two evaluation indexes of ratio k with safety valve, face propulsion speed v and press step pitch P
etop board disaster grade corresponding to two evaluation indexes, for more dangerous, only has, increases resistance ratio Δ p
bcorresponding top board disaster grade is safety.Draw accordingly, in the present embodiment, described roof of coal face disaster grade is dangerous.
In conjunction with concrete evaluation index value, can intuitive judgment draw, described top board disaster is embodied in pressure rack and roof fall, therefore, should note the maintenance of described roof of coal face or top coal integrality, and increases the setting load p of hydraulic support
0.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among protection scope of the present invention.
Claims (8)
1. a roof of coal face disaster alarm evaluation method, is characterized in that:
Roof of coal face disaster grade is divided into safe, more dangerous, dangerous three classes;
Set up evaluation index, described evaluation index comprises setting load p
0, increase resistance ratio Δ p
b, face propulsion speed v, press step pitch Pe and safety valve to open ratio k;
Described setting load p
0, increase resistance ratio Δ p
bwith press step pitch P
eall move frame cycle period based on fully-mechanized mining working surface hydraulic support, set up Mathematical Modeling and obtain;
The monitoring information that described safety valve is opened ratio k to be provided according to monitoring instrument obtains, and described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support;
Described face propulsion speed v determines by described fully-mechanized mining working exploitation actual conditions;
Described setting load reference index is p
1and p
2, described increasing resistance ratio reference index is γ
1and γ
2, the described step pitch reference index of pressing is P
1and P
2, described face propulsion speed reference index is v
1and v
2, described safe opening ratio reference index is k
1and k
2;
Described reference index p
1and p
2, γ
1and γ
2, P
1and P
2, v
1and v
2, k
1and k
2value all by test fully-mechanized mining working production data, analytic statistics obtains;
The criterion that judges top board disaster grade according to described every evaluation index is as shown in the table:
In the time that the corresponding disaster grade of described any one evaluation index is danger, described roof of coal face disaster grade is danger.
2. Alarm Assessment method according to claim 1, is characterized in that: evaluation index also comprises post lack of uniformity dp before and after hydraulic support, and before and after described hydraulic support, post lack of uniformity dp is obtained by design formulas below:
Wherein, p
before, p
after, p
hbe respectively described hydraulic support front pillar, rear pillar working resistance and described hydraulic support yield load;
The monitoring information that described front and back post lack of uniformity dp provides according to monitoring instrument obtains, described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support, described front and back post lack of uniformity reference index is α and β, and described reference index α and β are all by test fully-mechanized mining working production data, analytic statistics obtains; The criterion adopting is as shown in the table:
3. Alarm Assessment method according to claim 1 and 2, is characterized in that: the Mathematical Modeling of calculating described increasing resistance ratio is:
Wherein, p
mfor described fully-mechanized mining working surface hydraulic support end resistance, p
0for described fully-mechanized mining working surface hydraulic support initial resistance, T is a circulation timei, p
hfor described fully-mechanized mining working surface hydraulic support yield load.
4. Alarm Assessment method according to claim 3, is characterized in that: the described step pitch P that presses
eby to Compressive Strength threshold p recently
twith the working surface hydraulic support last resistance p that circulates
msize is determined, is carried out Compressive Strength threshold p
tdesign formulas is:
Wherein,
for respectively the circulate average of last resistance of described fully-mechanized mining working surface hydraulic support, p
tifor the circulation end resistance of each circulation, σ
pthe mean square deviation of last resistance average circulates;
The described fully-mechanized mining working surface hydraulic support last resistance p that circulates
mbe greater than to come Compressive Strength threshold p
ttime, be considered as fully-mechanized mining working generating period and press, according in former and later two periodic weightings interval times, the distance that fully-mechanized mining working advances calculates to arrive presses step pitch P
e.
5. Alarm Assessment method according to claim 4, is characterized in that: the number of described test fully-mechanized mining working should be no less than two.
6. Alarm Assessment method according to claim 5, is characterized in that: in the time calculating described safety valve unlatching ratio k, the number of the described fully-mechanized mining working surface hydraulic support of choosing is no less than 10% of sum.
7. Alarm Assessment method according to claim 6, is characterized in that: calculating setting load p
0, increase resistance ratio Δ p
bduring with front and back post lack of uniformity dp, the number of the described fully-mechanized mining working surface hydraulic support of choosing is no less than 10% of sum, and the value obtaining is average.
8. Alarm Assessment method according to claim 7, is characterized in that: calculating the described step pitch P that presses
etime, the described fully-mechanized mining working periodic weighting number of times of choosing is no less than three times, and the value obtaining is average.
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Cited By (9)
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| CN104481590A (en) * | 2014-11-18 | 2015-04-01 | 煤炭科学技术研究院有限公司 | Long wall coal mining roof pressure hydraulic support resistance change characteristic pre-warning method |
| CN106441669A (en) * | 2016-08-31 | 2017-02-22 | 中煤科工集团重庆研究院有限公司 | Coal mine working face roof weighting judgment method |
| CN106968713A (en) * | 2017-04-21 | 2017-07-21 | 东北大学 | A kind of whole audience quick Real-time Feedback recognition methods of coal mine roof plate stress field and caving zone |
| CN109653779A (en) * | 2019-01-09 | 2019-04-19 | 天地科技股份有限公司 | A kind of fully-mechanized mining working coal mining recycles the dynamic prediction method of interior hydraulic support load |
| CN109798138A (en) * | 2019-01-09 | 2019-05-24 | 天地科技股份有限公司 | A kind of circulation end drag prediction method of the hydraulic support suitable for fully-mechanized mining working |
| CN110397475A (en) * | 2019-08-09 | 2019-11-01 | 精英数智科技股份有限公司 | The super prop drawing monitoring and pre-alarming method of fully-mechanized mining working advance support, apparatus and system |
| CN110671109A (en) * | 2019-11-01 | 2020-01-10 | 中国矿业大学(北京) | Method for breaking roof of goaf behind corner of longwall working face |
| CN111734492A (en) * | 2020-07-02 | 2020-10-02 | 中国矿业大学 | Intelligent working surface roof fall early warning method based on U-shaped area characteristic parameter extraction |
| CN112145231A (en) * | 2020-08-20 | 2020-12-29 | 中煤科工开采研究院有限公司 | Early warning method for working condition of hydraulic support |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481590A (en) * | 2014-11-18 | 2015-04-01 | 煤炭科学技术研究院有限公司 | Long wall coal mining roof pressure hydraulic support resistance change characteristic pre-warning method |
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| CN109653779A (en) * | 2019-01-09 | 2019-04-19 | 天地科技股份有限公司 | A kind of fully-mechanized mining working coal mining recycles the dynamic prediction method of interior hydraulic support load |
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| CN109653779B (en) * | 2019-01-09 | 2020-05-22 | 天地科技股份有限公司 | Dynamic prediction method for hydraulic support load in fully mechanized mining face coal mining cycle |
| CN110397475A (en) * | 2019-08-09 | 2019-11-01 | 精英数智科技股份有限公司 | The super prop drawing monitoring and pre-alarming method of fully-mechanized mining working advance support, apparatus and system |
| CN110397475B (en) * | 2019-08-09 | 2020-05-01 | 精英数智科技股份有限公司 | Fully-mechanized mining face advance support and super-prop-drawing monitoring and early warning method, device and system |
| CN110671109A (en) * | 2019-11-01 | 2020-01-10 | 中国矿业大学(北京) | Method for breaking roof of goaf behind corner of longwall working face |
| CN111734492A (en) * | 2020-07-02 | 2020-10-02 | 中国矿业大学 | Intelligent working surface roof fall early warning method based on U-shaped area characteristic parameter extraction |
| CN111734492B (en) * | 2020-07-02 | 2021-08-24 | 中国矿业大学 | Intelligent working surface roof fall early warning method based on U-shaped area characteristic parameter extraction |
| CN112145231A (en) * | 2020-08-20 | 2020-12-29 | 中煤科工开采研究院有限公司 | Early warning method for working condition of hydraulic support |
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