CN103790628B - A kind of roof of coal face disaster alarm evaluation methodology - Google Patents
A kind of roof of coal face disaster alarm evaluation methodology Download PDFInfo
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Abstract
A kind of roof of coal face disaster alarm evaluation methodology, is divided into three classes safe, relatively hazardous, dangerous by roof of coal face disaster loss grade；Establishing evaluation index, evaluation index includes setting load p0, increase resistance ratio of Δ pb, face propulsion speed v, water component Pe and relief valve open ratio k；Setting load reference index is p1And p2, increasing resistance ratio reference index is γ1And γ2, water component reference index is P1And P2, face propulsion speed reference index is v1And v2, safe opening scale base index is k1And k2；Reference index p1And p2, γ1And γ2, P1And P2, v1And v2, k1And k2Value each through to test fully-mechanized mining working production data analytic statistics obtain；When any one evaluation index correspondence disaster loss grade is dangerous, described roof of coal face disaster loss grade is danger.Alarm Assessment methodological science provided by the invention is effective, and accuracy is high, and is easy to production technology personnel and proposes danger releasing measures timely and effectively, it is to avoid loss that top board disaster causes and harm.
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 methodology.
Background technology
In Coal Mine Disasters, roof accident is all multiple accident for mine main or infrastructure mine, and to the safety in production of mine, to build hazardness very big.Also obtain gradually for increasing top board disaster accident, mine pressure monitoring system or Roof Monitor system and be increasingly widely applied.But it practice, along with China's coal-mine integration in recent years puts more effort, the small coal mines of non-support or supporting quality difference reduces rapidly, but the frequency that roof accident occurs still keeps high-order.This is primarily present the following aspects reason: one is that high intensity stope gets more and more, many coal mining enterprises are when conditions permit, all adopt high working face overlength work surface and super large advance distance production technique so that face roof is caving rule generation significant change compared with the strata pressure laws under tradition recovery method；Two is that western shallow-reserved deep seam mining mine, exploitation work surface proportion are increasing, and the shallowly-buried and thick seam strata pressure laws that presents of exploitation also lacks the research that relatively system is deep.
Based on above reason, Roof Monitor work is forced day by day to systematization, densification develops, make every effort to by a large scale, high density, high digital monitoring realizes the Accurate Prediction to top board disaster to be prevented, but actually, generation and top board displacement due to top board disaster, STRESS VARIATION is not simple linear relationship, so, although the generation being prevented top board disaster by direct monitoring and forecasting has fabulous real-time, but accuracy is poor, current roof accident takes place frequently, top board disaster is still that in coal production one of several major casualtys and is exactly strong proof, and owing to top board disaster includes pressure rack, cut top, the particular types such as roof fall and roof weighting impact, rely solely on monitoring instrument monitoring also cannot Disasters Type effectively be distinguished, and instruct timely formulating danger releasing measures offer.
If it is desired to realizing breaking through to the prevention of top board hazard prediction, top board hazard prediction prevention work then should not be only limited to rely on the direct monitoring of monitoring instrument, although monitoring instrument is in continuous upgrading, and should be carried out in conjunction with monitoring means by scientific evaluation method.Evaluation methodology to accomplish that science is accurate, and core still to set up the appraisement system of a set of science, including the defining method of disaster loss grade classification, evaluation index and reference value.
Summary of the invention
The invention provides a kind of roof of coal face disaster alarm evaluation methodology, solve current roof of coal face disaster alarm poor accuracy, solve danger not in time, the technical problem of effectiveness difference.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows:
A kind of roof of coal face disaster alarm evaluation methodology, is divided into three classes safe, relatively hazardous, dangerous by roof of coal face disaster loss grade；Establishing evaluation index, described evaluation index includes setting load p0, increase resistance ratio of Δ pb, face propulsion speed v, water component Pe and relief valve open ratio k；Described setting load p0, increase resistance ratio of Δ pbBeing based on fully-mechanized mining working surface hydraulic support with water component Pe and move frame cycle period, founding mathematical models obtains；Described relief valve is opened the ratio k monitoring information provided according to monitoring instrument and is obtained, 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 exploits practical situation by described fully-mechanized mining working and determines；Described setting load reference index is p1And p2, the described resistance ratio reference index that increases isAnd γ2, described water component reference index is P1And P2, described face propulsion speed reference index is v1And v2, described safe opening scale base index is k1And k2；Described reference index p1And p2,And γ2, P1And P2, v1And v2, k1And k2Value each through to test fully-mechanized mining working production data analytic statistics obtain；Judge that the criterion of top board disaster loss grade is as shown in the table according to described every evaluation index:
When described any one evaluation index correspondence disaster loss grade is dangerous, described roof of coal face disaster loss grade is danger.
In above-mentioned Alarm Assessment method, evaluation index also includes 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 following computing formula:
Wherein, pBefore、pAfter、pHRespectively 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 obtains each through to test fully-mechanized mining working production data analytic statistics；The criterion adopted is as shown in the table:
In above-mentioned Alarm Assessment method, calculating the described mathematical model increasing resistance ratio is:
Wherein, pmFor described fully-mechanized mining working surface hydraulic support end resistance, p0For described fully-mechanized mining working surface hydraulic support initial resistance, T is a circulation time, pHFor described fully-mechanized mining working surface hydraulic support yield load.
In above-mentioned Alarm Assessment method, water component is by contrasting ground pressure strength marginal value ptWith working surface hydraulic support circulation end resistance pmSize is determined, ground pressure strength marginal value ptComputing formula is:
Wherein,The meansigma methods of end resistance is respectively circulated for described fully-mechanized mining working surface hydraulic support；σpThe mean square deviation of circulation end resistance meansigma methods.
Described fully-mechanized mining working surface hydraulic support circulation end resistance pmMore than ground pressure strength marginal value ptTime, it is considered as fully-mechanized mining working generating period and presses, according in former and later two periodic weightings interval times, the distance that fully-mechanized mining working advances calculates water component Pe。
In above-mentioned Alarm Assessment method, the number of described test fully-mechanized mining working should no less than two.
In above-mentioned Alarm Assessment method, when calculating described relief valve and opening ratio k, the number of the described fully-mechanized mining working surface hydraulic support chosen is no less than the 10% of sum.
In above-mentioned Alarm Assessment method, calculating setting load p0, increase resistance ratio of Δ pbDuring with front and back post lack of uniformity dp, the number of the described fully-mechanized mining working surface hydraulic support chosen is no less than the 10% of sum, and the value obtained is meansigma methods.
In above-mentioned Alarm Assessment method, when calculating described water component Pe, the described fully-mechanized mining working periodic weighting number of times chosen is no less than three times, and the value obtained is meansigma methods.
In above-mentioned Alarm Assessment method, described evaluation index also includes any two relief valve opening support spacing distance Kd, time unlatching rate KtWith circulation unlatching rate Kc。
Described time unlatching rate KtRefer to that the time of an ON cycle internal safety valve unlatching overflow accounts for the percentage ratio of total cycle time.Described circulation unlatching rate KcRefer to that the circulation of relief valve overflow accounts for the percentage ratio of total observation cycle number.
Described any two relief valve opening support spacing distance Kd, time unlatching rate KtWith circulation unlatching rate KcObtaining according to the monitoring information that monitoring instrument provides, described monitoring instrument is the stress monitoring equipment being installed on described fully-mechanized mining working surface hydraulic support.
Described any two relief valve opening support spacing distance reference index Kd1And Kd2, described time unlatching rate reference index Kt1And Kt2, described circulation unlatching rate reference index Kc1And Kc2Obtain each through to test fully-mechanized mining working production data analytic statistics；The criterion adopted is as shown in the table:
The technique scheme of the present invention has the advantage that compared to existing technology
1. roof of coal face disaster alarm evaluation methodology provided by the invention, it is evaluated top board calamity danger degree analyzing owing to have employed multinomial evaluation index, and the evaluation index reference value adopted is all based on the statistical data that mining is theoretical and obtains in mining Practice, therefore, the present invention has more science, more accuracy.
2. roof of coal face disaster alarm evaluation methodology provided by the invention, owing to having carried out selecting targetedly according to concrete division of top board disaster to evaluation index, therefore, the present invention can on the basis of early warning, instruct the concrete Disasters Type reflected about shaft production technical staff for different evaluation index, take danger releasing measures timely and effectively, it is to avoid loss that top board disaster causes and harm.
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, below according to specific embodiments of the invention and in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the working resistance change curve during certain frame hydraulic moving stand that the data monitored according to monitoring instrument in embodiment are drawn.
In figure, accompanying drawing labelling is expressed as: the 1-longitudinal axis (working resistance/MPa), 2-transverse axis (time/s), 3-hydraulic support working resistance change curve, during 4-moves frame, 5-setting load point, 6-end resistance point.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
In the present embodiment, certain coal mining work surface is comprehensive extracting and caving face.
In the present embodiment, described fully-mechanized mining working surface hydraulic support installs 100 framves altogether, and yield load is 40MPa.Fully-mechanized mining working surface hydraulic support described in every 5 framves being arranged, the working resistance during hydraulic moving stand is monitored by a monitoring instrument in real time, monitors 20 framves altogether.Monitoring period is 60.
Shown in Fig. 1 is the working resistance change curve during certain the frame hydraulic moving stand drawn according to monitoring instrument Monitoring Data.
According to Monitoring Data, it is 26MPa that 20 frame monitoring hydraulic supports respectively circulate the meansigma methods of average end resistance, and the mean square deviation of meansigma methods is 2.6MPa, and ground pressure strength marginal value is 28.6MPa.Judging according to ground pressure strength marginal value, through 60 circulations, fully-mechanized mining working advances 60m altogether, and generating period is pressed 3 times altogether, and average water component is 18m.
In the present embodiment, being 3 for calculating the test face of reference index value, statistical analysis obtains setting load p0, increase resistance ratio of Δ pb, face propulsion speed v, water component PeOpen each reference index of ratio k with relief valve and be worth as shown in the table.
Loop-around data according to monitoring, calculating the described hydraulic support obtaining 20 framves monitorings, respectively to circulate the meansigma methods of average setting load be 16.8MPa.
According to formulaWith the loop-around data of monitoring, calculate and obtain 20 framves monitoring hydraulic supports respectively to circulate the average meansigma methods increasing resistance ratio be 8%.
Loop-around data according to monitoring, opens ratio k to Safety Valve for Hydraulic Powered Support described in 20 framves monitored and adds up, and it is 19% that each frame respectively circulates the meansigma methods of unlatching ratio.
According to actual measurement, fully-mechanized mining working fltting speed average out to 4m/ days in exploitation.
By calculated described setting load p0, increase resistance ratio of Δ pb, face propulsion speed v, water component PeOpening ratio k with relief valve, each evaluation index reference value obtained with statistics compares, it is possible to obtain: p2> p0, Δ pb≤γ1, v1> v≤v2, P1< Pe≤P2, k > k2。
Comparison evaluation criteria table, described setting load p0Opening top board disaster loss grade corresponding to two evaluation indexes of ratio k with relief valve is all dangerous, face propulsion speed v and water component PeTop board disaster loss grade corresponding to two evaluation indexes is relatively hazardous, only increases resistance ratio of Δ pbCorresponding top board disaster loss grade is safety.Drawing accordingly, in the present embodiment, described roof of coal face disaster loss grade is dangerous.
In conjunction with concrete evaluation index value, it is possible to intuitive judgment draws, described top board disaster is embodied in pressure rack and roof fall, it is noted, therefore, that the maintenance of described roof of coal face or top coal integrity, and increase the setting load p of hydraulic support0。
Obviously, above-described embodiment is only for clearly demonstrating example, and is not the 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 cannot all of embodiment be given exhaustive.And the apparent change thus extended out or variation are still among protection scope of the present invention.
Claims (7)
1. a roof of coal face disaster alarm evaluation methodology, it is characterised in that:
Roof of coal face disaster loss grade is divided into three classes safe, relatively hazardous, dangerous；
Establishing evaluation index, described evaluation index includes setting load p0, increase resistance ratio of Δ pb, face propulsion speed v, water component Pe and relief valve open ratio k；
Described setting load p0, increase resistance ratio of Δ pbWith water component PeBeing based on fully-mechanized mining working surface hydraulic support and move frame cycle period, founding mathematical models obtains；
Described relief valve is opened the ratio k monitoring information provided according to monitoring instrument and is obtained, 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 exploits practical situation by described fully-mechanized mining working and determines；
Described setting load reference index is p1And p2, the described resistance ratio reference index that increases is γ1And γ2, described water component reference index is P1And P2, described face propulsion speed reference index is v1And v2, scale base index opened by described relief valve is k1And k2；
Described reference index p1And p2, γ1And γ2, P1And P2, v1And v2, k1And k2Value each through to test fully-mechanized mining working production data analytic statistics obtain；
Judge that the criterion of top board disaster loss grade is as shown in the table according to described every evaluation index:
When described any one evaluation index correspondence disaster loss grade is dangerous, described roof of coal face disaster loss grade is danger.
Calculating the described mathematical model increasing resistance ratio is:
Wherein, pmFor described fully-mechanized mining working surface hydraulic support end resistance, p0For described fully-mechanized mining working surface hydraulic support initial resistance, T is a circulation time, pHFor described fully-mechanized mining working surface hydraulic support yield load.
2. Alarm Assessment method according to claim 1, it is characterised in that: evaluation index also includes 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 following computing formula:
Wherein, pBefore、pAfter、pHRespectively 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 obtains each through to test fully-mechanized mining working production data analytic statistics；The criterion adopted is as shown in the table:
3. Alarm Assessment method according to claim 2, it is characterised in that: described water component PeIt is by contrasting ground pressure strength marginal value ptWith working surface hydraulic support circulation end resistance pmSize is determined, ground pressure strength marginal value ptComputing formula is:
Wherein,The meansigma methods of end resistance, σ is respectively circulated for described fully-mechanized mining working surface hydraulic supportpThe mean square deviation of circulation end resistance meansigma methods；
Described fully-mechanized mining working surface hydraulic support circulation end resistance pmMore than ground pressure strength marginal value ptTime, it is considered as fully-mechanized mining working generating period and presses, according in former and later two periodic weightings interval times, the distance that fully-mechanized mining working advances calculates water component Pe。
4. Alarm Assessment method according to claim 3, it is characterised in that: the number of described test fully-mechanized mining working should no less than two.
5. Alarm Assessment method according to claim 4, it is characterised in that: when calculating described relief valve and opening ratio k, the number of the described fully-mechanized mining working surface hydraulic support chosen is no less than the 10% of sum.
6. Alarm Assessment method according to claim 5, it is characterised in that: calculating setting load p0, increase resistance ratio of Δ pbDuring with front and back post lack of uniformity dp, the number of the described fully-mechanized mining working surface hydraulic support chosen is no less than the 10% of sum, and the value obtained is meansigma methods.
7. Alarm Assessment method according to claim 6, it is characterised in that: calculating described water component PeTime, the described fully-mechanized mining working periodic weighting number of times chosen is no less than three times, and the value obtained is meansigma methods.
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| CN104481590B (en) * | 2014-11-18 | 2017-03-08 | 煤炭科学技术研究院有限公司 | A kind of colliery broadwall roof weighting hydraulic support resistive feature method for early warning |
| 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 |
| CN109798138B (en) * | 2019-01-09 | 2020-05-22 | 天地科技股份有限公司 | Circulation end resistance prediction method of hydraulic support suitable for fully mechanized mining face |
| 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 |
| 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 |
| CN110671109B (en) * | 2019-11-01 | 2021-07-09 | 中国矿业大学(北京) | Method for breaking roof of goaf behind corner of longwall working face |
| 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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| CN102455176A (en) * | 2010-10-20 | 2012-05-16 | 山西潞安环保能源开发股份有限公司 | Monitoring method of damage height of overlying strata in mining field |
| CN102455434A (en) * | 2010-10-20 | 2012-05-16 | 山西潞安环保能源开发股份有限公司 | Monitoring method of working-face coal-body advanced stress |
| CN102628373B (en) * | 2012-04-27 | 2014-04-23 | 天地科技股份有限公司 | Impact ground pressure split source comprehensive early-warning method of coal mine |
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