CN114151133A - Grading early warning method for incoming pressure of top plate of fully mechanized mining face - Google Patents
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- E—FIXED CONSTRUCTIONS
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention relates to the technical field of coal mine safety mining, and provides a grading early warning method for the incoming pressure of a top plate of a fully mechanized coal mining face, which comprises the following steps: determining a top plate incoming pressure strength grading standard; determining a top plate incoming pressure grading early warning index; and comprehensively judging the incoming pressure grade of the top plate. According to the comprehensive evaluation method, a set of scientific evaluation method for the incoming pressure grade of the fully mechanized mining face is formed through grading standards, early warning indexes, index weight distribution and incoming pressure grade comprehensive evaluation, the evaluation indexes of the incoming pressure grade can be obtained through deep analysis of mine pressure monitoring data of the working face, and a grading early warning algorithm and a program for the incoming pressure of the top plate of the fully mechanized mining face with an intelligent analysis early warning function can be formed through current advanced information means such as computer programming and large data machine self-learning, so that intelligent grading early warning of the incoming pressure of the top plate of the fully mechanized mining face is realized, and the timeliness is improved.
Description
Technical Field
The invention relates to the technical field of coal mine safety mining, in particular to a grading early warning method for the incoming pressure of a top plate of a fully mechanized coal mining face.
Background
The old top of the coal face under the coal mine is a key rock stratum causing the mine pressure of the face to appear. In the process of advancing the working face, the old top is broken for the first time or periodically, and the mine pressure phenomenon caused to the working face is called the first time coming pressure or the periodic coming pressure of the old top. The primary or periodic pressure of the working face has important influence on the management and safe production of the working face top plate, and the influence degree is directly related to the pressure intensity of the top plate.
Roof disasters such as caving of a rib and bracket pressing caused by strong coming pressure need to be prevented in the roof management of the working face, and the normal production of the working face cannot be greatly influenced by the general periodic coming pressure of the working face.
In addition, due to the influence of different factors such as geological conditions and mining intensity, the pressure incoming strength of the roof plates in different mines, different working faces and even different areas of the same working face can be different, and in order to take measures in time when the strong pressure comes or even before the strong pressure comes, the pressure incoming degree can be pre-judged according to early warning information obtained by monitoring the mine pressure, so that the method has important significance for preventing and treating roof disasters.
Disclosure of Invention
The invention provides a grading early warning method for the coming pressure of a fully mechanized mining face top plate, which is used for solving the defect that the intelligent grading early warning for the coming pressure of the fully mechanized mining face top plate cannot be realized in the prior art and ensuring the operation safety.
The invention provides a grading early warning method for the incoming pressure of a fully mechanized mining face top plate, which comprises the following steps:
determining a top plate incoming pressure strength grading standard;
determining a top plate incoming pressure grading early warning index;
and comprehensively judging the incoming pressure grade of the top plate.
According to the early warning method for grading the incoming pressure of the top plate of the fully mechanized mining face, the step of determining the grading standard of the incoming pressure strength of the top plate further comprises the following steps:
according to the mine pressure display intensity of the fully mechanized mining face and the influence on the safety production of the fully mechanized mining face, the pressure intensity of the top plate is divided into I level, II level, III level and IV level.
According to the fully mechanized mining face top plate incoming pressure grading early warning method provided by the invention, in the step of determining the top plate incoming pressure grading early warning index, the method further comprises the following steps:
determining the utilization rate of the working resistance of the bracket;
determining the support resistance increasing rate;
determining a dynamic load coefficient of the bracket;
determining the opening index of the bracket safety valve;
and determining the shrinkage of the bracket plunger.
According to the fully mechanized mining face roof pressure grading early warning method provided by the invention, in the step of determining the working resistance utilization rate of the support, the calculation formula of the working resistance utilization rate eta of the support is as follows:
wherein the content of the first and second substances,
the average value of the resistance at the end of the support cycle in the influence range of the incoming pressure in one coal mining cycle during the incoming pressure of the working face roof; pForehead (forehead)The rated working resistance of the bracket.
The invention provides a fully mechanized mining face roofThe early warning method for grading the pressure of the coal mining cycle comprises the step of determining the resistance increasing rate v of a certain stage in the coal mining cycleiThe calculation formula of (A) is as follows:
vi＝ΔPi/Δt
in the formula: delta PiThe resistance increasing quantity of the bracket at a certain time period in the coal mining cycle is expressed in MPa; and delta t is the resistance increasing time of the bracket at a certain stage in the coal mining cycle, and the unit is min.
According to the grading early warning method for the incoming pressure of the fully mechanized mining face roof, provided by the invention, in the step of determining the dynamic load coefficient of the support, the calculation formula of the dynamic load coefficient K is as follows:
K＝Ppressure of coming t/PPressure of Tanbai
In the formula: pPressure of coming tThe end resistance of the stent circulation during the pressure on the working surface is expressed in kN; pPressure of TanbaiThe cyclic resistance of the bracket during the non-pressure period of the working surface is expressed in kN.
According to the grading early warning method for the incoming pressure of the fully mechanized mining face roof, the opening index A of the safety valve in the step of determining the opening index of the safety valve of the support isqThe calculation formula of (A) is as follows:
j is the number of the brackets for opening the safety valve during the period of the working face pressure; t is tiThe total opening time of the safety valve of the ith support in the period of the current period of pressure supply of the working face is min; and N is the total number of the working surface mounting brackets.
According to the grading early warning method for the coming pressure of the fully mechanized mining face top plate, the step of determining the downward shrinkage of the support plunger further comprises the following steps:
and the downward shrinkage of the support plunger is monitored by a displacement sensor arranged on the support.
According to the fully mechanized mining face top plate incoming pressure grading early warning method provided by the invention, in the step of determining the top plate incoming pressure grading early warning index, the method further comprises the following steps:
and the pressure of the stand column of the support is monitored by a pressure sensor arranged on the support.
According to the early warning method for grading the incoming pressure of the top plate of the fully mechanized mining face, provided by the invention, the comprehensive judgment step of the incoming pressure grade of the top plate further comprises the following steps:
and analyzing and determining a reference value of the pressure grade corresponding to each roof pressure grade early warning index according to the roof pressure incoming strength grading standard and by combining the mine pressure sample data in the mine pressure database, and further dividing the pressure grade corresponding to the early warning index value section according to the reference value.
The invention provides a grading early warning method for the incoming pressure of a fully mechanized mining face roof, which comprises the following steps: determining a top plate incoming pressure strength grading standard; determining a top plate incoming pressure grading early warning index; the comprehensive judgment of the top plate incoming pressure grade forms a set of scientific evaluation method of the fully mechanized working face incoming pressure grade through grading standard, early warning index, index weight distribution and incoming pressure grade comprehensive judgment, the judgment index of the incoming pressure grade can be obtained through deep analysis of the working face mine pressure monitoring data, and a fully mechanized working face top plate incoming pressure grading early warning algorithm and program with an intelligent analysis early warning function can be formed through current advanced information means such as computer programming and big data machine self-learning, so that the intelligent grading early warning of the fully mechanized working face top plate incoming pressure is realized, and the timeliness is improved.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a fully mechanized mining face roof pressure grading early warning method provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The fully mechanized mining face roof pressure grading early warning method of the invention is described below with reference to fig. 1, and includes the following steps:
determining a top plate incoming pressure strength grading standard;
determining a top plate incoming pressure grading early warning index;
and comprehensively judging the incoming pressure grade of the top plate.
According to the early warning method for grading the incoming pressure of the top plate of the fully mechanized mining face, the step of determining the grading standard of the incoming pressure strength of the top plate further comprises the following steps:
according to the mine pressure display intensity of the fully mechanized mining face and the influence on the safety production of the fully mechanized mining face, the pressure intensity of the top plate is divided into I level, II level, III level and IV level.
According to the fully mechanized mining face top plate incoming pressure grading early warning method provided by the invention, in the step of determining the top plate incoming pressure grading early warning index, the method further comprises the following steps:
determining the utilization rate of the working resistance of the bracket;
determining the support resistance increasing rate;
determining a dynamic load coefficient of the bracket;
determining the opening index of the bracket safety valve;
and determining the shrinkage of the bracket plunger.
According to the fully mechanized mining face roof pressure grading early warning method provided by the invention, in the step of determining the working resistance utilization rate of the support, the calculation formula of the working resistance utilization rate eta of the support is as follows:
wherein the content of the first and second substances,
the average value of the resistance at the end of the support cycle in the influence range of the incoming pressure in one coal mining cycle during the incoming pressure of the working face roof; pForehead (forehead)The rated working resistance of the bracket.
According to the full-mechanized mining face roof pressure grading early warning method provided by the invention, in the step of determining the support resistance increasing rate, the resistance increasing rate v at a certain stage in a coal mining cycleiThe calculation formula of (A) is as follows:
vi＝ΔPi/Δt
in the formula: delta PiThe resistance increasing quantity of the bracket at a certain time period in the coal mining cycle is expressed in MPa; and delta t is the resistance increasing time of the bracket at a certain stage in the coal mining cycle, and the unit is min.
According to the grading early warning method for the incoming pressure of the fully mechanized mining face roof, provided by the invention, in the step of determining the dynamic load coefficient of the support, the calculation formula of the dynamic load coefficient K is as follows:
K＝Ppressure of coming t/PPressure of Tanbai
In the formula: pPressure of coming tThe end resistance of the stent circulation during the pressure on the working surface is expressed in kN; pPressure of TanbaiThe cyclic resistance of the bracket during the non-pressure period of the working surface is expressed in kN.
According to the grading early warning method for the incoming pressure of the fully mechanized mining face roof, the opening index A of the safety valve in the step of determining the opening index of the safety valve of the support isqThe calculation formula of (A) is as follows:
j is the number of the brackets for opening the safety valve during the period of the working face pressure; t is tiThe total opening time of the safety valve of the ith support in the period of the current period of pressure supply of the working face is min; and N is the total number of the working surface mounting brackets.
According to the grading early warning method for the coming pressure of the fully mechanized mining face top plate, the step of determining the downward shrinkage of the support plunger further comprises the following steps:
and the downward shrinkage of the support plunger is monitored by a displacement sensor arranged on the support.
According to the fully mechanized mining face top plate incoming pressure grading early warning method provided by the invention, in the step of determining the top plate incoming pressure grading early warning index, the method further comprises the following steps:
and the pressure of the stand column of the support is monitored by a pressure sensor arranged on the support.
According to the early warning method for grading the incoming pressure of the top plate of the fully mechanized mining face, provided by the invention, the comprehensive judgment step of the incoming pressure grade of the top plate further comprises the following steps:
and analyzing and determining a reference value of the pressure grade corresponding to each roof pressure grade early warning index according to the roof pressure incoming strength grading standard and by combining the mine pressure sample data in the mine pressure database, and further dividing the pressure grade corresponding to the early warning index value section according to the reference value.
The invention provides a grading early warning method for the incoming pressure of a fully mechanized mining face top plate, which specifically comprises the following steps:
s1, determining the classification standard of the incoming pressure strength of the top plate
According to the strong degree of mine pressure display of the working face and the influence on production, the coming pressure strength of the top plate is divided into four grades:
class i (weak): the dynamic ore loading pressure of the working face is not obvious, the safety valve is basically not opened, the rib caving of the working face is not serious, the downward shrinkage of the movable column of the support is not obvious, and the pressure of the top plate has no influence on the normal production of the working face;
stage ii (medium): the working face has a certain dynamic ore loading pressure, the bracket safety valve has an opening phenomenon, the bracket plunger has a little shrinkage amount, the working face has a rib phenomenon, and the influence of the pressure coming from the top plate on the normal production of the working face is small;
grade iii (intense): the opening ratio of the safety valve of the bracket is higher during the pressure of the working face, the downward shrinkage of the movable column of the bracket is obvious, the dynamic ore pressure of the working face is strongly shown, the rib caving of the coal wall is serious, certain interference is caused to the continuous operation of the working face, and the phenomenon of gangue falling occasionally exists on the top plate of the working face;
grade iv (abnormal): the safety valve of the working face support is opened in a large range for a long time, the movable column of the support shrinks seriously, the side roof of the working face sheet is seriously roof-rolled, the normal production of the working face is greatly interfered, and the safe working environment of workers is threatened; the movable column of the support is too low, the coal mining machine cannot pass through the movable column, even the support is directly pressed, or the side of the working face is seriously jacked, so that the working face is forced to stop production, and a serious roof disaster is formed.
S2, determining the early warning index of the top plate pressure grading
Due to the concealment of the roof disaster, the support pressure and the roof displacement are monitored, and the monitoring data are deeply analyzed, so that an important means for pre-judging and quantitatively analyzing the roof disaster in advance is provided. Corresponding sensors are arranged on a hydraulic support of a fully mechanized coal mining face to acquire support upright column pressure and support plunger downward shrinkage (reflecting roof displacement). Wherein, the downward shrinkage of the bracket plunger is monitored by a displacement sensor arranged on the bracket; and the pressure of the stand column of the support is monitored by a pressure sensor arranged on the support.
The key indexes of the working face top plate coming pressure grading early warning are obtained through the real-time monitoring and analysis of the support pressure and the plunger downward shrinkage displacement. According to the coal mine roof disaster prevention practice and mine pressure display rule research, the working resistance utilization rate of the support, the support resistance increasing rate, the dynamic load coefficient, the safety valve opening index and the support retraction amount are used as main indexes of the working face roof pressure grading early warning. The calculation method of each early warning index is as follows:
s21, determining the working resistance utilization rate of the bracket
The support cycle end resistance refers to the working resistance before the hydraulic support moves the support when the coal mining cycle is finished and the next coal mining cycle is about to start, and generally refers to the maximum working resistance of the cycle support according to the characteristic that the hydraulic support gradually increases resistance under the action of the sinking of the top plate. When the working face top plate is pressed, the average value of the cycle end resistance is added with the mean square error of 1-2 times to serve as the criterion of the working face pressing, and the cycle end resistance of the support is obviously higher than that in the non-pressing period when the working face top plate is pressed, so that the size of the cycle end resistance of the support is the most intuitive expression of the pressure intensity of the working face top plate.
The ratio of the tail resistance of the support in the working surface pressure coming period to the rated working resistance of the support is called the utilization rate of the working resistance of the support, and the parameter can well reflect the surplus degree of the working resistance of the support in the working surface pressure coming period, so that the parameter is an important judgment index for judging the pressure coming strength of the top plate and the disaster risk. The scaffold operating resistance utilization η may be represented by the following formula:
in the formula:
the average value of the resistance at the end of the support cycle in the influence range of the incoming pressure in one coal mining cycle during the incoming pressure of the working face roof; pForehead (forehead)The rated working resistance of the bracket.
S22, determining the stent resistance increasing rate
The cycle resistance increasing rate of the bracket is generally in positive correlation with the activity strength of the top plate or the sinking speed of the top plate, and reflects the intensity of the mine pressure display of the working surface. The working resistance of the bracket generally increases faster during the period of the working face pressure coming, the stronger the pressure coming, the faster the resistance increasing speed of the bracket, and the rapid resistance increasing phenomenon of the bracket generally accompanies when the working face top plate is pressed, but the resistance increasing characteristic of the bracket is more in a slow resistance increasing or constant resistance state during the pressure coming, so that the resistance increasing speed of the bracket can be used as an important representation index for judging the pressure coming of the working face top plate.
The rate of increase in resistance of the stent is not a whole set within the same cycleWhen the moving state of the working face top plate is changed, the resistance increasing speed of the support is also changed, and the phenomenon of increasing resistance in stages is presented. Rate of increase of drag v at a stage in a coal mining cycleiCan be represented by the following formula:
vi＝ΔPi/Δt
in the formula: delta PiThe unit is the resistance increase amount in MPa at a certain time period in the support circulation; and delta t refers to resistance increasing time in min at a certain stage of the cycle.
S23, determining dynamic load coefficient of bracket
The ratio of the last resistance of the support cycle during the pressure-incoming period of the working face top plate to the last resistance of the support cycle during the non-pressure-incoming period is called the dynamic load coefficient. The dynamic load coefficient is one of important indexes for representing the pressure intensity of the working face top plate, and the larger the dynamic load coefficient is, the stronger the pressure of the working face top plate is. The dynamic load coefficient K can be represented by the following formula:
K＝Ppressure of coming t/PPressure of Tanbai
In the formula: pPressure of coming tThe resistance at the end of the stent circulation during the pressure coming from the working surface is expressed in kN; pPressure of TanbaiRefers to the circulation resistance of the bracket during the non-pressure period of the working surface, and the unit is kN.
S24, determining the opening index of the bracket safety valve
When the type of the working face bracket is selected, the supporting strength of the bracket is matched with the pressure intensity of the working face top plate, and the opening ratio of the safety valve of the bracket is in a reasonable range when the pressure of the working face top plate is applied. When the working face top plate is pressed strongly and even has a roof disaster, the support safety valve is often opened for a long time in a large range, and the safety valve is opened for a long time to cause the roof to sink continuously, so that a frame pressing or roof caving accident can be caused, and therefore the opening proportion of the safety valve and the opening duration of the safety valve are important indexes for representing the working face top plate pressure intensity and the roof disaster risk. In order to reflect the influence of the opening proportion and the opening time of the safety valve at the same time, the concept of the opening index of the safety valve is introduced, and the opening index of the safety valve is represented by the following formula:
in the formula, AqThe safety valve opening index; j is the number of brackets for opening the safety valve during the period of the working face pressure; t is tiThe total opening time of the safety valve of the ith support in the period of the current period of pressure supply of the working face is min; and N is the total number of the working surface mounting brackets.
S25, determining the downward shrinkage of the bracket plunger
The pressure of the working face caused by the periodic instability of the working face top plate structure is reflected in the phenomena that the working resistance of the support rises, the safety valve is opened and the like, and is also reflected in the phenomenon that the movable column of the support shrinks due to the sinking of the top plate, and when the pressure of the top plate far exceeds the support supporting capacity of the support, the support is pressed. On-site accessible monitoring support post flexible volume changes and carries out the early warning of working face roof pressure, and because the support rigidity is invariable under the specific condition, the roof pressure intensity is higher, and the support post volume of contracting is big more, consequently can be with the support post volume of contracting down as one of the index of the table representation working face roof pressure intensity.
S3 comprehensive judgment of roof pressure level
Analyzing and determining the reference values of different coming pressure grades corresponding to each evaluation index according to the evaluation standard of the coming pressure grade ore pressure display and the grasped ore pressure sample data of different coming pressure grades in the ore pressure database, dividing the coming pressure grades corresponding to different value intervals of the evaluation indexes according to the reference values, and if the coming pressure grade evaluation index is set as u, setting the reference index corresponding to the four coming pressure grades as u1、u2、u3And u is1<u2<u3. When u is less than or equal to u1When the voltage is higher than the threshold, the corresponding incoming voltage level is I level (weak); when u is1<u≤u2When the pressure is higher than the set pressure, the corresponding pressure level is level II (medium); when u is2<u≤u3When the pressure is higher than the set pressure, the corresponding incoming pressure grade is grade III (strong); when u is>u3When the voltage is higher than the predetermined value, the corresponding incoming voltage level is class IV (abnormal). According to the above, the pressure level criteria corresponding to each evaluation index are shown in table 1 below.
TABLE 1 coming pressure grade criterion corresponding to each evaluation index
When the evaluation indexes correspond to different incoming pressure grades, different score values are given, and the score values D corresponding to the different incoming pressure grades of the evaluation indexesiThe determination method is shown in the following table 2, the score values corresponding to the first-class, the second-class, the third-class and the fourth-class pressure grades are respectively 1, 2, 3 and 4, and the higher the score value is, the higher the pressure grade is, the stronger the pressure is.
TABLE 2 scoring values D of different incoming pressure ratings for each evaluation indexi
According to the method of expert scoring, the weight of each evaluation index is determined through pairwise comparison, and the weight of five evaluation indexes is respectively marked as xi1、ξ2、ξ3、ξ4、ξ5。
The face pressure level composite score value may be recorded as:
according to the comprehensive score value, the final comprehensive judgment is carried out on the incoming pressure grade of the working face according to the principle of high or low, as shown in the table 3. When the comprehensive score value D is 1, namely the incoming pressure grades corresponding to all the discrimination indexes are I grades, judging that the incoming pressure grade of the working face is I grade; when D is more than 1 and less than or equal to 2, the corresponding incoming pressure grade is level II; when D is more than 2 and less than or equal to 3, the corresponding incoming pressure grade is grade III; when 3< D ≦ 4, the corresponding incoming pressure level is level IV.
TABLE 3 comprehensive discrimination of pressure level of working face
Examples
In the embodiment of the invention, the reference value of the incoming pressure grade evaluation index of the fully mechanized mining face is obtained by analyzing a large amount of sample data in the mine pressure database, the incoming pressure grade criterion corresponding to each evaluation index is shown in a table 4, and the weight of each evaluation index is determined to be shown in a table 5.
Table 4 incoming pressure rating criterion corresponding to each evaluation index
TABLE 5 evaluation index weight partitioning
In the embodiment, a fully mechanized mining working surface of a certain mine is a working surface with shallow burial depth and super large mining height, and the rated opening pressure of the stand column of the support of the working surface is 47 MPa. Counting the maximum cycle end resistance of the bracket of 6 cycles of incoming pressure cycle of the working surface to be 46.1-46.5 MPa, the average resistance to be 46.3MPa, and the utilization rate of the working resistance of the bracket to be 0.98-0.99; the maximum resistance increasing rate of the support of the working surface during the pressure incoming period is 0.33 MPa/min-0.88 MPa/min, and the average resistance increasing rate is 0.46 MPa/min; the dynamic load coefficient is 1.45-1.61, and the average dynamic load coefficient is 1.44; the opening index of the safety valve is 19 min/frame-239 min/frame, and the average value is 101.3 min/frame; the shrinkage of the movable column of the bracket during the period of the pressure on the working face is 46 mm-120 mm, and the average shrinkage is 68.5 mm. According to the coming pressure grade criteria and the weight distribution of each evaluation index in the tables 4 and 5, the coming pressure grade discrimination comprehensive score value of 6 periodic coming pressures on the working surface is 2.6-3.0, and according to the coming pressure grade discrimination principle, the coming pressure grades of 6 periodic coming pressures on the working surface are judged to be III grades (strong), and the reference is made in the tables 6 and 7.
TABLE 6 statistics of evaluation indexes of the pressure grade of a certain ore
TABLE 7 discrimination results of the pressure grade of a certain ore
The invention provides a grading early warning method for the incoming pressure of a fully mechanized mining face roof, which comprises the following steps: determining a top plate incoming pressure strength grading standard; determining a top plate incoming pressure grading early warning index; the comprehensive judgment of the top plate incoming pressure grade forms a set of scientific evaluation method of the fully mechanized working face incoming pressure grade through grading standard, early warning index, index weight distribution and incoming pressure grade comprehensive judgment, the judgment index of the incoming pressure grade can be obtained through deep analysis of the working face mine pressure monitoring data, and a fully mechanized working face top plate incoming pressure grading early warning algorithm and program with an intelligent analysis early warning function can be formed through current advanced information means such as computer programming and big data machine self-learning, so that the intelligent grading early warning of the fully mechanized working face top plate incoming pressure is realized, and the timeliness is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A full-mechanized mining face roof pressure grading early warning method is characterized by comprising the following steps:
determining a top plate incoming pressure strength grading standard;
determining a top plate incoming pressure grading early warning index;
and comprehensively judging the incoming pressure grade of the top plate.
2. The fully mechanized mining face roof pressure grading early warning method of claim 1, wherein the determining a roof pressure intensity grading standard step further comprises the steps of:
according to the mine pressure display intensity of the fully mechanized mining face and the influence on the safety production of the fully mechanized mining face, the pressure intensity of the top plate is divided into I level, II level, III level and IV level.
3. The fully mechanized mining face roof pressure grading early warning method of claim 1, wherein the roof pressure grading early warning indicator determining step further comprises the steps of:
determining the utilization rate of the working resistance of the bracket;
determining the support resistance increasing rate;
determining a dynamic load coefficient of the bracket;
determining the opening index of the bracket safety valve;
and determining the shrinkage of the bracket plunger.
4. The fully mechanized mining face roof pressure grading early warning method of claim 3, wherein in the step of determining the working resistance utilization rate of the support, the calculation formula of the working resistance utilization rate η of the support is as follows:
wherein the content of the first and second substances,
for branches within the influence range of the incoming pressure in one coal mining cycle during the incoming pressure of the working face roofAverage value of resistance at end of shelf cycle; pForehead (forehead)The rated working resistance of the bracket.
5. The fully mechanized mining face roof pressure grading early warning method of claim 3, wherein in the step of determining the support resistance increase rate, the resistance increase rate v at a certain stage in a coal mining cycleiThe calculation formula of (A) is as follows:
vi＝ΔPi/Δt
in the formula: delta PiThe resistance increasing quantity of the bracket at a certain time period in the coal mining cycle is expressed in MPa; and delta t is the resistance increasing time of the bracket at a certain stage in the coal mining cycle, and the unit is min.
6. The fully mechanized mining face roof pressure grading early warning method of claim 3, wherein in the step of determining the dynamic load coefficient of the support, the dynamic load coefficient K is calculated by the following formula:
K＝Ppressure of coming t/PPressure of Tanbai
In the formula: pPressure of coming tThe end resistance of the stent circulation during the pressure on the working surface is expressed in kN; pPressure of TanbaiThe cyclic resistance of the bracket during the non-pressure period of the working surface is expressed in kN.
7. The fully mechanized mining face roof pressure grading pre-warning method of claim 3, wherein in the step of determining the opening index of the support safety valve, the opening index A of the safety valve isqThe calculation formula of (A) is as follows:
j is the number of the brackets for opening the safety valve during the period of the working face pressure; t is tiThe total opening time of the safety valve of the ith support in the period of the current period of pressure supply of the working face is min; and N is the total number of the working surface mounting brackets.
8. The fully mechanized mining face roof pressure grading early warning method of claim 3, wherein the step of determining the downward shrinkage of the support plunger further comprises the steps of:
and the downward shrinkage of the support plunger is monitored by a displacement sensor arranged on the support.
9. The fully mechanized mining face roof pressure grading early warning method according to any one of claims 3 to 8, wherein the step of determining the roof pressure grading early warning indicator further comprises the steps of:
and the pressure of the stand column of the support is monitored by a pressure sensor arranged on the support.
10. The fully mechanized mining face roof pressure grading early warning method of claim 1, wherein the comprehensive judgment step of the roof pressure grade further comprises the following steps:
and analyzing and determining a reference value of the pressure grade corresponding to each roof pressure grade early warning index according to the roof pressure incoming strength grading standard and by combining the mine pressure sample data in the mine pressure database, and further dividing the pressure grade corresponding to the early warning index value section according to the reference value.
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