CN111625940B - Island working surface exploitability demonstration method based on rock burst - Google Patents
Island working surface exploitability demonstration method based on rock burst Download PDFInfo
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Abstract
The invention discloses an island working surface exploitability demonstration method based on rock burst, which comprises the following steps: s1, demonstrating rock burst mine attributes of a mine to which the island working face belongs; s2, demonstrating the necessity of 'anti-scour safety mining demonstration': determining the necessity of 'scour prevention safety mining demonstration' according to the rock burst mine attribute demonstration result of the mine to which the island working face belongs; s3, aiming at the island working face which needs to be subjected to 'anti-impact safe mining demonstration' in the step S2, firstly demonstrating the impact type of the island working face, secondly calculating the anti-impact engineering quantity of the island working face on the basis of developing risk factor investigation and impact risk evaluation, and finally evaluating the mine anti-impact capability according to the mine personnel and mechanism setting, the monitoring capability of a monitoring system and the pressure relief tool allocation condition. The method comprehensively evaluates whether the island working face can be safely mined, is easy to operate, and effectively guides the safe mining of the island working face.
Description
Technical Field
The invention relates to the field of coal mine safety mining, in particular to an island working face mineability demonstration method based on rock burst.
Background
Early mines mostly employed strip mining and skip mining, so that these mines were ubiquitous with various forms of island faces: and the method comprises the following steps of adjacent two-side mining, three-side mining, two-side mining and fault cutting, three-side mining and fault cutting and the like. These remaining island faces need to be mined later in mine mining due to the scarcity of mineral resources and the like. In recent years, with the increase of the mining depth, the frequency of occurrence of rock burst accidents on an island working face is increased, and the safety production of mines and the safety of lives and property of staff are seriously affected.
According to the thirty-second regulation of coal mine fine rule for preventing and controlling coal mine rock burst: before an island coal pillar is mined from a rock burst coal bed, coal mine enterprises should organize experts to perform scour prevention safety mining demonstration, and the demonstration result indicates that safety mining cannot be guaranteed and mining operation cannot be performed; and the isolated island coal pillar cannot be mined in the mine due to the severe rock burst.
Whether the island working face can be safely exploited or not, namely, which can not be exploited or can be safely recovered or which can be safely recovered after a certain anti-impact measure is taken, the engineering technical problem still lacks an effective theoretical basis at present, and most of the expert argumentations are organized only by experience. At present, an impact ground pressure danger evaluation method is adopted to perform anti-impact safe mining demonstration on an island working surface, and a conclusion of 'whether safe mining can be guaranteed' cannot be obtained. For this reason, it is necessary to provide an effective method for demonstrating the exploitability of the working surface of the island based on the rock burst.
Disclosure of Invention
In order to meet the requirements, the invention provides an island working surface exploitability demonstration method based on rock burst.
The technical scheme for solving the technical problem is as follows: an island working surface exploitability demonstration method based on rock burst comprises the following steps:
s1, demonstrating rock burst mine attributes of a mine to which the island working face belongs, and dividing the rock burst mine attributes of the mine to which the island working face belongs into: non-rock burst mines and rock burst mines.
And judging the rock burst mine attribute according to the rock burst coal seam attribute. If the coal seam with the rock burst phenomenon in the mine well field range or the coal seam (or the top floor rock stratum thereof) is identified to have the impact tendency and is evaluated to be the rock burst coal seam, the mine with the rock burst coal seam is the rock burst mine. A non-percussive rock burst mine is defined above with respect to a percussive rock burst and a severe rock burst mine if the coal seam (and its top and bottom strata) has no propensity to percussive, or if the coal seam (or its top and bottom strata) has a propensity to percussive but is assessed as not risking a percussive rock burst.
S2, demonstrating the necessity of 'anti-scour safety mining demonstration': and determining the necessity of 'scour prevention safety mining demonstration' according to the rock burst mine attribute demonstration result of the mine to which the island working face belongs. If the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a non-rock burst mine, the island working face is directly judged to be 'recoverable' without developing the island working face scour prevention safety mining demonstration; and if the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a rock burst mine, the island working face is judged to need to be subjected to 'anti-impact safe mining demonstration' in the next step.
And S3, performing 'anti-impact safe mining demonstration' on the island working face which needs to be subjected to 'anti-impact safe mining demonstration' in the step S2.
The 'scour protection safety mining demonstration' comprises three aspects: firstly, arguing "island working face strikes the type", secondly calculate island working face scour protection engineering volume on the basis of developing risk factor investigation and impact danger evaluation, thirdly, according to mine personnel and mechanism setting, monitoring system's monitoring capability and release machines outfit the condition aassessment mine scour protection ability.
Firstly, demonstrating the impact type of an island working surface, if the impact type of the island working surface is integral impact, suggesting 'strictly stopping recovery', and if the impact type of the island working surface is local impact, demonstrating the relationship between the mine anti-impact capacity and the anti-impact engineering quantity of the island working surface.
The judgment of the impact type of the island working surface is based on whether lateral supporting pressure peaks of mining areas on two sides in the inclined direction are overlapped. If the lateral support pressure peaks of the mining areas on the two sides are overlapped, judging that the impact type of the island working surface is integral impact, otherwise, judging that the island working surface is local impact. The integral impact means that rock burst can occur on the coal wall of the working face and on both the gate roads. The local impact means that the coal wall of the working face is not impacted, and the impact can occur in the two gate roads.
Secondly, the relation between the mine anti-impact capacity and the island working face anti-impact engineering quantity is demonstrated, if the island working face anti-impact engineering quantity is larger than the mine anti-impact capacity, the island working face is judged to be strictly forbidden to recover, and if the island working face anti-impact engineering quantity is smaller than the mine anti-impact capacity, the island working face is judged to be recoverable.
The mine anti-impact capacity comprises mine pressure relief drilling construction capacity.
Island working face scour protection engineering volume's calculation includes the quantity according to island working face coal seam large aperture drilling, includes: dividing a tunneling rock burst dangerous area and a recovery rock burst dangerous area of an island working surface; calculating the length of the roadway in each area; setting parameters of pressure relief drilling holes in the roadway of each area, including drilling hole spacing and depth; and calculating the total number and the total length of the pressure relief drill holes required by tunneling and recovery.
The island working face exploitability demonstration method based on rock burst comprehensively evaluates whether the island working face can be safely exploited, is easy to operate, and effectively guides the safe exploitation of the island working face.
Drawings
FIG. 1 is a flow chart of demonstration of anti-scour safety mining of an island working face;
FIG. 2 is a diagram of island working surface bearing pressure distribution;
fig. 3 is an island working surface bearing pressure curve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A mine, comprising a ZF3808 island working face. As shown in fig. 1: the island working surface exploitability demonstration method based on the rock burst comprises the following steps:
(1) firstly, the rock burst mine attribute of the mine to which the island working face belongs is demonstrated, and the rock burst mine attribute of the mine to which the island working face belongs is divided into: non-rock burst mines and rock burst mines.
The rock stratum bending energy index of the mine coal roof is identified to be 75.38KJ, and the mine coal roof is a weak impact tendency roof; the bending energy index of the rock stratum of the coal bottom plate is 5.61KJ, and the coal bottom plate is a bottom plate without impact tendency; the coal seam dynamic failure time DT is 59.4 (weak impact), the impact energy index KE is 4.9 (weak impact), the elastic energy index Wet is 4.99 (weak impact), the uniaxial compressive strength Rc is 20.07MPa (strong impact), and the comprehensive judgment result is the coal seam with weak impact tendency. Meanwhile, the coal seam rock burst risk index Wt1 of the coal seam is evaluated to be 0.67, so that the coal seam has medium impact risk, and the main influencing factors are the compressive strength of coal, the impact tendency of a hard thick roof rock layer and the coal seam and the like; the rock burst risk index Wt2 under the influence of mining technical factors is 0.70, has medium impact risk, and is influenced by main coal pillars, goafs, long working faces, re-mining and other factors; through comprehensive comparison and analysis, the rock burst danger state grade of the coal seam related to the frame is considered to be medium impact danger, and the impact danger index is 0.70. And the mine exploitation has not occurred to the ground pressure.
And judging that the coal bed belongs to a rock burst coal bed, and judging that the mine belongs to a rock burst mine. Therefore, the island working face of the mine has the demonstration necessity of anti-impact safe mining.
(2) Demonstration of necessity of anti-scour safety mining demonstration
And determining the necessity of 'scour prevention safety mining demonstration' according to the rock burst mine attribute demonstration result of the mine to which the island working face belongs. If the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a non-rock burst mine, the island working face is directly judged to be 'recoverable' without developing the island working face scour prevention safety mining demonstration; if the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a severe rock burst mine, directly judging that the island working face is strictly forbidden to carry out stoping; and if the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a rock burst mine, judging that the island working face needs to be subjected to 'anti-impact safe mining demonstration'.
(3) And (3) performing 'anti-scour safety mining demonstration' aiming at the island working face which needs to perform 'anti-scour safety mining demonstration' in the step (2).
The 'anti-impact safe mining demonstration' needs to develop three aspects of work, firstly demonstrates the 'impact type of an island working surface', secondly calculates the anti-impact engineering quantity of the island working surface on the basis of developing risk factor investigation and impact risk evaluation, and thirdly evaluates the anti-impact capacity of a mine according to mine personnel and mechanism setting, the monitoring capacity of a monitoring system and the allocation condition of a pressure relief machine. Firstly, demonstrating the impact type of an island working surface, if the impact type of the island working surface is integral impact, suggesting 'strictly stopping recovery', and if the impact type of the island working surface is local impact, demonstrating the relationship between the mine anti-impact capacity and the anti-impact engineering quantity of the island working surface.
1) Island working surface impact type judgment
The judgment of the impact type of the island working surface is based on whether lateral supporting pressure peaks of two mining areas on two sides in the inclined direction are overlapped. If the lateral support pressure peaks of the mining areas on the two sides are overlapped, judging that the impact type of the island working surface is integral impact, otherwise, judging that the island working surface is local impact. The integral impact means that rock burst can occur on the coal wall of the working face and on both the gate roads. The local impact means that the coal wall of the working face is not impacted, and the impact can occur in the two gate roads. And then, judging the impact type of the island working surface by calculating the lateral bearing pressure of the goaf.
And for the goaf areas on the two sides of the working face, the range is large, the top plate is in a full mining stage, and the fracture height of the rock stratum is about 5-8 times of the thickness of the coal bed. The movement of the overlying strata of the goaf is based on rock stratum groups, and the thick and hard rock stratum in each rock stratum group is used as a key layer to control the movement and deformation of the rock stratum group. And each rock stratum group generates a separation layer in front of the working face, the separation layer appears between a key layer of the upper rock stratum group and a weak rock stratum of the lower rock stratum group, a connecting line of the separation layer end on one side of the goaf is called a rock stratum fracture line, and an included angle alpha between the connecting line and the horizontal line is called a rock stratum fracture angle. The lateral supporting pressure sigma of the coal body at one side of the goaf consists of a self-weight stress sigma q, a stress increment delta sigma and the like, namely
σ＝Δσ+σq(1)
In the formula: delta sigma is equal to the sum of pressures transmitted to coal bodies on one side by suspended parts of key layers above the goaf, namely delta sigma is sigma-sigma i; and σ i is the pressure transmitted by the suspended part of the key layer of the ith layer to the coal body on one side, and i is 1-n.
The weight that every key layer suspension part transmitted to the coal body of collecting space one side is half of its weight, and the stress increment that transmits to the coal body of collecting space one side is isosceles trapezoid and distributes, and then the stress increment that the ith key layer transmitted to the coal body of collecting space one side is:
in the formula: sigma maxi is the maximum supporting pressure generated by the ith layer key layer on the coal body on one side of the goaf, and the sigma maxi is Qi/Hicot alpha; mi is the thickness of the ith layer of the key layer; hi is the distance from the thickness center of the ith key layer to the bottom plate of the coal seam, and Hi is I + Mi/2+ Sigma Mj (j is 1-I-1); 2I is the width of a goaf; qi is half of the weight of the i-th key layer in the gob suspension part, and is LiMi gamma/2; li is the length of the I-th layer key layer thickness center position in the gob, and Li is 2I +2Hicot alpha; and gamma is the volume weight of the rock stratum.
And superposing the stress increments generated by the n key layer suspension parts, thereby obtaining the stress increment delta sigma.
The stress σ q due to self weight is:
in the formula: h is the mining depth.
It can be seen that the calculation formula of the working face lateral bearing pressure is a set of piecewise functions.
The calculation steps are as follows:
calculating sigma maxi;
calculating delta sigma i;
computing segmentation function interval demarcation points Hi · ctg α, 2Hi · ctg α, I · ctg α, H · ctg α;
calculating delta sigma according to the overlapping interval of the piecewise function;
calculating sigma q in a segmented manner;
sixthly, synthesizing the sigma-delta sigma + sigma q in a segmented mode;
and drawing a supporting pressure distribution diagram.
The goaf lateral bearing pressure is calculated as:
the influence of the goaf such as ZF3807, ZF3805 and ZF3803 on one side of the return air gate of the island working surface is that the length of the goaf exceeds 1600m, and the two sides of the ZF3808 working surface are fully mined according to the observation of ground surface settlement. Taking a rock stratum fracture angle alpha as 80 degrees, taking an average mining depth as 318m, calculating according to overlying strata stress transfer of a goaf under a full mining condition, wherein the height I of a overlying strata caving zone is 5 multiplied by 11.5 to 57.5m, and the calculation interval of an independent variable in an obtained piecewise function is as follows:
[0，10.1)、[10.1，33.1)、[33.1，56.1)、[56.1，66.2)、[66.2，+∞)
for simplicity of the calculation, the thickness M1 was 187M when the formation above the fracture range was considered to be a formation group. The parameters of the working face are substituted for the equations (1) to (3), and the volume weight gamma of the rock stratum is taken as 2.5t/m 3. The specific calculation formula (4) of the lateral bearing pressure can be obtained as follows.
The support pressure profile is plotted as shown in fig. 2. As can be seen from the figure, the influence range of the lateral supporting pressure of the goaf is about 66m, which is consistent with the field monitoring result of about 70 m; the goaf support pressure peak is 33m from the goaf, where it is about 12m below the stress zone width.
In the same way, the stress distribution law of the goaf on one side of the transportation crossheading of the island working surface is the same as that of the return air crossheading. The island working surface bearing pressure curve is obtained, as shown in figure 3. As can be seen from fig. 3, both sides of the working face of the island are affected by the goaf, but the lateral bearing pressure peaks of the goafs on both sides do not overlap, that is, both crossheading of the working face of the island are impact-proof key points, and the impact type is local impact.
Based on the above analysis: the mine does not belong to a severe rock burst mine, but belongs to a rock burst mine, the impact type of the island working surface is local impact, and a conclusion of 'whether safe mining can be guaranteed' can be obtained after the demonstration of 'the relation between the mine impact-proof capacity and the island working surface impact-proof engineering quantity'.
2) Scour protection engineering quantity calculation
According to the recent anti-impact work development condition of the mine, the pressure relief drill hole with the aperture of 133mm and the hole depth of 25m is constructed on the roadway side, and the pressure relief drill hole with the aperture of 133mm and the hole depth of 2m is constructed on the roadway bottom plate, so that a good anti-impact effect can be ensured. And the amount of scour protection ultimately depends on the number of pressure relief boreholes. The number of drilled holes is related to the range of various dangerous areas and the distance between drilled holes. According to the previous construction experience of a mine, pre-relieving pressure in advance by adopting a construction pressure relief drilling mode during the driving period of a working face, wherein the pressure relief drilling intervals of a weak rock burst dangerous area are 3m, the pressure relief drilling intervals of a medium rock burst dangerous area are 2m, and the pressure relief drilling intervals of a strong rock burst dangerous area are 1 m; and constructing pressure relief drill holes according to the change condition of the danger degree of the dangerous area during the recovery. Therefore, the development of the impact ground pressure danger zone division is the basis for calculating the impact resistance of the ZF3808 island working face.
Dividing a dangerous area of impact ground pressure in tunneling of a ZF3808 island working face:
considering that a small coal pillar with the width of 4m is reserved between two gate roads and a goaf of a ZF3808 island working face, the danger degree of rock burst is relatively low when the two gate roads are in a low stress area of lateral bearing pressure of the goaf during tunneling, the influence of the goaf on the tunneling of the cutting hole and the connecting roadway is large, and the danger degree of the rock burst is relatively high. Therefore, during the excavation of the working face of the ZF3808 island, two gate roads are divided into a danger area with weak impact pressure, and the cut-off and connection lanes are divided into a danger area with medium impact pressure. The length of a roadway in a medium impact ground pressure dangerous area during the tunneling of a ZF3808 island working face is as follows: 160+64+98+41+78 ═ 441 m; the length of the roadway in the danger zone of the weak impact ground pressure is 448+ 414-862 m.
② ZF3808 island working face extraction impact dangerous area division
Considering that the dynamic pressure influence caused by primary incoming pressure, square and secondary square of a working surface of a ZF3808 island is large, and the coal pillars on the outer side of the stoping line are acted by a goaf, determining that the influence ranges of the primary incoming pressure, the square and the secondary square and the roadway in the coal pillars on the outer side of the stoping line are dangerous areas with medium rock burst, and the rest areas are dangerous areas with weak rock burst. According to the pushing and mining experience of a working face of a ZF3803 island, the step distance of the first-time pressure is 37m, and the range of 40m outside the step distance of the first-time pressure of two gate roads is determined as an influence area of the first-time pressure; the influence range of the square and the second square is 80m before the position of the corresponding square. Therefore, the length of the roadway in the dangerous area with medium impact pressure during the recovery period of the working surface of the ZF3808 island is as follows: 765m for 40 × 2+80 × 2+80 × 2+98+48+41+ 78; the length of the roadway in the danger zone of the weak impact ground pressure is 37 multiplied by 2+83 multiplied by 2+80 multiplied by 2 which is 400 m.
③ calculating the anti-impact engineering quantity of ZF3808 island working surface
And (3) anti-impact engineering quantity calculation during tunneling:
during the tunneling of a ZF3808 island working face, the spacing between pressure relief holes of lane walls of a dangerous area with weak rock burst is 3m, the spacing between pressure relief holes of lane walls of a dangerous area with medium rock burst is 2m, and the spacing between pressure relief holes of lane walls of a dangerous area with strong rock burst is 1 m. The cut hole of the working surface of the ZF3808 island is a dangerous area with medium rock burst, two sides of construction pressure relief holes are needed, and the other dangerous areas with medium rock burst are constructed by one side of the construction pressure relief holes. According to the distance, the number of pressure relief drill holes in the danger zone of medium impact pressure is 160+140 to 300, the number of pressure relief drill holes in the danger zone of weak impact pressure is 862/3 to 287, and the cumulative number of pressure relief drill holes is 587. And if the depth of the pressure relief drilling hole of the roadway wall part is 25m, the engineering quantity of the pressure relief drilling hole of the wall part is 587 multiplied by 25 which is 14675 m. The arrangement mode of the pressure relief drilling holes of the roadway bottom plate is two holes in one row, the row distance is 2m, the hole depth is 2m, and the engineering quantity of the pressure relief drilling holes of the bottom plate is 1165 multiplied by 2 which is 2330 m.
Calculating the anti-scour engineering quantity during the stoping period:
because the pressure relief drill holes are constructed during the excavation of the working face of the ZF3808 island, only the areas with the high risk degree of the impact ground pressure dangerous area are subjected to pressure relief drilling during the recovery period, if the weak impact ground pressure dangerous area during the excavation becomes a medium impact ground pressure dangerous area during the recovery period, 1 pressure relief drill hole needs to be added between the original pressure relief drill holes, if the weak impact ground pressure dangerous area during the excavation becomes a strong impact ground pressure dangerous area during the recovery period, 2 pressure relief drill holes need to be added between the original pressure relief drill holes, and if the medium impact ground pressure dangerous area during the excavation becomes a strong impact ground pressure dangerous area during the recovery period, 1 pressure relief drill hole needs to be added between the original pressure relief drill holes.
The areas with increased risk degree of the rock burst dangerous area comprise an initial pressure, a square, a secondary square influence area and a return air coal pillar area outside a stope line along the groove side, namely, the weak rock burst danger in the tunneling period is increased to the medium rock burst danger in the stope period, and the length of a roadway is 40 multiplied by 2+80 multiplied by 2+ 48-448 m. The number of pressure relief drill holes required to be constructed during the recovery period is 448/3-150, and the engineering quantity is 150 multiplied by 25-3750 m. The drilling of the roadway bottom plate is only carried out once, and the construction is not carried out during the extraction period after the construction in the tunneling period.
It can be seen that the number of pressure relief holes at the roadway side part during the tunneling and stoping period of the ZF3808 island face is 737, the engineering quantity is 18425m, the number of pressure relief holes at the bottom plate is 1165, the engineering quantity is 2330m, and the accumulated engineering quantity is 20755 m.
3) Mine impact resistance assessment
Scour protection mechanism and personnel
The mine has built an anti-scour team as an anti-scour disaster control professional team, simultaneously takes a team responsible for construction anti-scour engineering in a mining work area as an anti-scour disaster control concurrent team, has a total number of more than 30 persons, and is responsible for pressure relief drilling construction, pulverized coal inspection drilling construction, rock burst monitoring equipment installation and maintenance and the like.
At present, the anti-impact structure and personnel arranged in the mine meet the requirements of 'prevention and control of coal mine rock burst pressure fine rule', and can meet the requirements of current mine anti-impact work.
Capability of monitoring rock burst
The mine is provided with a microseismic monitoring system, and can meet the regional monitoring requirement; the on-line stress monitoring system is installed on the stope face, the support load monitoring system is installed on the hydraulic support, and meanwhile, a drilling cutting method is adopted as an auxiliary monitoring and pressure relief effect testing means, so that the local monitoring requirement of the stope face is met.
Meanwhile, the mine is provided with an online stress monitoring system, a ground sound monitoring system and an anchor rod (cable) stress monitoring system in a tunneling roadway, and simultaneously adopts a drilling cutting method as an auxiliary monitoring and pressure relief effect testing means, so that the vibration-stress monitoring requirement of the tunneling roadway is met.
At present, the monitoring method adopted by the mine meets the requirements of 'fine rule for preventing and controlling coal mine rock burst', and can meet the monitoring requirement of the current mine rock burst.
Construction capacity for pressure relief
Currently, the mine is equipped with 9 pressure relief rigs, 10 pneumatic hand-held rigs.
According to the annual rock burst prevention and control plan of mines, pressure relief drill holes 55750m are constructed according to the annual plan. 2 pressure relief drill holes with the depth of 25m are constructed according to 1 pressure relief drill rig per class, 2 × 6 × 3 × 300 pressure relief drill holes with the depth of 25m can be constructed in 1 year (taking 300 days) under the condition that 6 pressure relief drill rigs are used and 3 pressure relief drill rigs are standby, wherein the construction amount is 10800 × 25 ═ 270000 m. Therefore, the construction capacity of the pressure relief drilling is far larger than the engineering quantity of the pressure relief drilling.
According to a ZF3808 island working face tunneling plan: the length of the cut hole is 160m, and the planned construction lasts 40 days; the length of the transportation gate is 510m, and the planned construction lasts 65 days; the length of the return air crossheading is 656m, and the construction is planned for 76 days. The average tunneling speed is (160 multiplied by 2+510+ 656)/181-8.2 m/d. If the construction is carried out in a medium-impact ground pressure dangerous area, the distance between the pressure relief drill holes is 2m, 4 pressure relief drill holes are required to be constructed every day, and the requirement can be met by arranging 1 pressure relief drill. On the other hand, the number of floor pressure relief drilling steps is 2330m, which is 94 in terms of upper pressure relief drilling, and is 681 in terms of 587 upper pressure relief drilling steps. 1 pressure relief drilling machine is arranged in the roadway, the construction period of the pressure relief drilling machine is 681/6 days which is 114 days and is far shorter than the tunneling construction period of the roadway 181 days.
According to a ZF3808 island working face extraction plan, the planned extraction time is 2020.12.1-2020.12.31 in 2020, the daily footage is 3.2m, and the accumulated advancing distance is 30 multiplied by 3.2 which is 96 m. And (4) completing the pressure relief drilling in advance by 150m, wherein the construction range of the pressure relief drilling is 150+ 96-246 m. If construction is carried out in a dangerous area with medium impact pressure, 1 pressure relief drill hole is encrypted, namely the distance between the pressure relief drill holes is 3m during reconstruction, 246/3 roadway on one side of a working face needs to be constructed, namely 82 roadway. 1 pressure relief drilling machine is arranged in the roadway, the construction period of the pressure relief drilling machine is 82/6 days which is 14 days and is far shorter than the mining time of a working face by 30 days.
Therefore, the mine has the capability of completing construction of pressure relief drilling on the ZF3808 island working face no matter from the construction capability or the construction period of the pressure relief drilling machine.
Therefore, the ZF3808 island working face is judged to be recoverable.
The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (4)
1. An island working surface exploitability demonstration method based on rock burst is characterized by comprising the following steps:
s1, dividing the rock burst mine attribute of the mine to which the island working face belongs into: the method comprises the following steps of (1) judging the attributes of a non-rock burst mine and a rock burst mine according to the attributes of a rock burst coal bed;
s2, when the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a non-rock burst mine, directly judging that the island working face can be used for stoping; when the rock burst mine attribute demonstration result of the mine to which the island working face belongs is a rock burst mine, the next step is carried out to judge that the island working face needs to be subjected to 'anti-impact safe mining demonstration';
s3, aiming at the island working face which needs to be subjected to the anti-impact safe mining demonstration in the step S2, the anti-impact safe mining demonstration is carried out, and the method comprises the following specific steps:
s31, demonstrating the impact type of the island working surface, strictly prohibiting recovery when the impact type of the island working surface is integral impact, and demonstrating the relationship between the mine anti-impact capacity and the anti-impact engineering quantity of the island working surface when the impact type of the island working surface is local impact;
the judgment of the impact type of the island working face is based on whether lateral supporting pressure peaks of mining areas at two sides in the inclined direction are overlapped, when the lateral supporting pressure peaks of the mining areas at two sides are overlapped, the impact type of the island working face is judged to be integral impact, and rock burst can occur on the coal wall and two crossroads of the working face; otherwise, judging that the coal wall of the working face is locally impacted, and the coal wall of the working face is not impacted, so that the two gate roads are likely to be impacted;
s32, calculating the anti-impact engineering quantity of the island working face on the basis of carrying out dangerous factor investigation and impact danger evaluation, demonstrating the relation between the mine anti-impact capacity and the anti-impact engineering quantity of the island working face, judging that the island working face is strictly forbidden to recover when the anti-impact engineering quantity of the island working face is greater than the mine anti-impact capacity, and judging that the island working face can recover when the anti-impact engineering quantity of the island working face is less than the mine anti-impact capacity;
and S33, evaluating the mine anti-impact capability by the pressure relief drilling construction capability under the condition that mine personnel and mechanism setting meet the requirement of the current mine anti-impact work and the monitoring capability of the monitoring system meets the requirement of the current mine rock burst monitoring.
2. The method for demonstrating the exploitability of the working face of the island based on the rock burst as claimed in claim 1, wherein the method comprises the following steps: in the step S1, when a coal seam with a rock burst phenomenon in the mine field range or a coal seam identified as having a rock burst tendency or a top floor rock stratum thereof and evaluated as a rock seam with a risk of rock burst is a rock burst coal seam, the coal seam with rock burst is a rock burst mine; and when the coal bed and the top floor rock stratum thereof have no impact tendency, or the coal bed or the top floor rock stratum thereof have impact tendency but are evaluated to have no rock burst risk, the coal bed is a non-rock burst mine.
3. The method for demonstrating the exploitability of the working face of the island based on the rock burst as claimed in claim 1, wherein the method comprises the following steps: and the calculation of the anti-impact engineering quantity of the island working surface comprises the quantity of pressure relief drill holes according to the coal seam of the island working surface.
4. The method for demonstrating the exploitability of the working face of the island based on the rock burst as claimed in claim 3, wherein the method comprises the following steps: calculating the number of pressure relief boreholes comprises: dividing a tunneling rock burst dangerous area and a recovery rock burst dangerous area of an island working surface; calculating the length of the roadway in each area; setting parameters of pressure relief drilling holes in the roadway of each area, including drilling hole spacing and depth; and calculating the total number and the total length of the pressure relief drill holes required by tunneling and recovery.
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