CN117552792A - Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect - Google Patents
Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect Download PDFInfo
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- CN117552792A CN117552792A CN202410033236.9A CN202410033236A CN117552792A CN 117552792 A CN117552792 A CN 117552792A CN 202410033236 A CN202410033236 A CN 202410033236A CN 117552792 A CN117552792 A CN 117552792A
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- 238000005422 blasting Methods 0.000 title claims abstract description 268
- 239000003245 coal Substances 0.000 title claims abstract description 166
- 238000010276 construction Methods 0.000 title claims abstract description 89
- 230000000694 effects Effects 0.000 title claims abstract description 34
- 238000005457 optimization Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 67
- 230000008569 process Effects 0.000 claims abstract description 37
- 238000004088 simulation Methods 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 238000004880 explosion Methods 0.000 claims description 32
- 239000002360 explosive Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 17
- 239000011435 rock Substances 0.000 claims description 9
- 208000008918 voyeurism Diseases 0.000 claims description 9
- 238000012795 verification Methods 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 3
- 238000009933 burial Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The application relates to the technical field of coal mine safety, and provides a bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect. The method comprises the following steps: performing primary blasting pressure relief on the roadway according to preset blasting pressure relief parameters, and judging the stability of the bottom coal of the roadway based on a pre-constructed active pressure relief failure critical thickness model of the bottom coal; in response to that the stability of the bottom coal of the roadway does not meet the preset stability condition, based on the active pressure relief failure mechanism of the bottom coal, performing cyclic optimization on the blasting pressure relief parameters according to the results of numerical simulation and field test of the whole blasting pressure relief process of the roadway in sequence; and performing secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters. By the method, the problem of pressure relief failure of bottom coal blasting caused by different surrounding environments of the roadway in the traditional method is avoided, resource waste and repeated construction caused by blind blasting pressure relief are avoided, blasting pressure relief effect is ensured, and blasting pressure relief construction efficiency is improved.
Description
Technical Field
The application relates to the technical field of coal mine safety, in particular to a bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect.
Background
In the super-thick coal seam layered mining process, the defect of thick bottom coal is overcome, the mechanical property of the bottom coal is poor, the covering environment is complex, the superposition of static loads such as horizontal, vertical ground stress and transfer stress and dynamic loads generated by explosive blasting is realized, the self-accumulation elastic energy is high, the power damage dissipation energy is low, and the bottom coal rock burst is frequent due to the small energy required by the limit damage of the bottom coal.
At present, a method of blasting and pressure relief of a bottom plate is mainly adopted to damage the integrity of the bottom plate and reduce the aggregation degree of energy, so that normal operation of mine production is ensured, but in the pressure relief construction process, the bottom coal blasting and pressure relief failure is often caused due to unreasonable parameter setting, the safety of first-line workers is influenced, and normal industrial production is disturbed.
Thus, there is a need to provide a solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The application aims to provide a bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect, so as to solve or alleviate the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a bottom coal blasting pressure relief optimization construction method based on blasting disturbance effect, which comprises the following steps: step S101, performing primary blasting pressure relief on a roadway according to preset blasting pressure relief parameters, and judging the stability of the bottom coal of the roadway based on a pre-constructed bottom coal active pressure relief failure critical thickness model; step S102, responding to that the stability of the bottom coal of the roadway does not meet a preset stable condition, and performing cyclic optimization on the blasting pressure relief parameters based on a failure mechanism of the active pressure relief of the bottom coal according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence; and step S103, performing secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
Preferably, in step S101: determining the active pressure relief failure critical thickness of the bottom coal after the primary blasting pressure relief construction of the roadway based on the active pressure relief failure critical thickness model of the bottom coal; determining a stability threshold value of the stability of the bottom coal of the roadway according to the thickness of the bottom coal of the roadway before the first blasting pressure relief construction, the blasting depth of the roadway during the first blasting pressure relief construction and the active pressure relief failure critical thickness of the bottom coal of the roadway after the first blasting pressure relief construction; responding to the stability threshold value being larger than zero, and enabling the stability of the bottom coal to meet a preset stability condition in the first blasting pressure relief construction process of the roadway; and responding to the stability threshold value being smaller than or equal to zero, wherein the stability of the bottom coal does not meet the preset stability condition in the first blasting pressure relief construction process of the roadway.
Preferably, the formula is as follows:
；
determining the stability thresholdThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is lane of roadThe active pressure relief failure critical thickness of the bottom coal after the first blasting pressure relief construction is +.>The thickness of the bottom coal of the roadway before the first blasting pressure relief construction is set; />And the effective blasting depth of the first blasting pressure relief construction is the roadway.
Preferably, the formula is as follows:
；
determining the active pressure relief failure critical thickness of bottom coal of roadway after the primary blasting pressure relief construction；
Wherein,
；
in the method, in the process of the invention,the modulus of elasticity of the coal rock; />The load influence range coefficient is used for supporting the load; />The roadway width; />Respectively the vertical stress and the horizontal stress of the coal seam beam of the roadway; />The number of blastholes for blasting and pressure relief in the roadway; />Is->The explosive in each blast hole transfers the energy to the coal seam beam of the roadway; />For the total energy transferred to the coal seam beam of the roadway; />Is->The distance from each blast hole to the bearing layer of the roadway; />Are all intermediate mathematical replacement variables.
Preferably, the formula is as follows:
；
determining effective blasting depth of the first blasting pressure relief construction of the roadwayThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Is vertical stress; />The vibration speed is safely allowed when the roadway is blasted and depressurized; />The damping coefficient of blasting impact in the blasting pressure relief process of the roadway; />Is the attenuation index of the blasting impact of the roadway in the blasting pressure relief process.
Preferably, step S102 includes: based on a roadway model constructed by the acquired roadway geological data, carrying out the overall process numerical simulation of the blasting pressure relief on the roadway so as to adjust blasting pressure relief parameters of blasting pressure relief of the roadway; the blasting pressure relief overall process numerical simulation comprises a primary blasting pressure relief simulation and a secondary blasting pressure relief simulation; according to the bottom bulging value of the middle point of the roadway bottom coal obtained through numerical simulation, performing rationality verification on the blasting pressure relief parameters after blasting pressure relief adjustment; responding to the numerical simulation of the whole explosion pressure relief process to determine that the explosion pressure relief parameters after the explosion pressure relief is adjusted are reasonable, and then carrying out small-range explosion pressure relief of not more than 10 meters on the roadway according to the explosion pressure relief parameters after the explosion pressure relief is adjusted; and verifying rationality of the explosion pressure relief parameters after the explosion pressure relief is adjusted according to the bottom bulging value of the middle point of the roadway bottom coal after the small-range explosion pressure relief, the collapse state of the detection holes before and after the small-range explosion pressure relief and the gun smoke in the detection holes after the small-range explosion pressure relief.
Preferably, in step S102, in response to the floor value of the middle point of the roadway floor coal after the small-range blasting pressure relief being smaller than the floor value of the first blasting pressure relief construction; and determining the deep collapse state of the detection holes before and after the small-range blasting pressure relief based on a drilling peeping detection technology; and detecting the occurrence of gun smoke in the hole after the small-range blasting and pressure relief; the explosion pressure relief parameters after the explosion pressure relief is determined to be adjusted are reasonable.
Preferably, in step S103, a secondary blasting pressure relief construction is performed on the roadway based on the blasting pressure relief parameters that pass the verification of the rationality of the small-range blasting pressure relief.
The embodiment of the application also provides a bottom coal blasting pressure relief optimization construction system based on blasting disturbance effect, which comprises: the primary blasting unit is configured to perform primary blasting pressure relief on the roadway according to preset blasting pressure relief parameters, and judge the stability of the bottom coal of the roadway based on a pre-constructed bottom coal active pressure relief failure critical thickness model; the parameter optimization unit is configured to respond to the fact that the stability of the bottom coal of the roadway does not meet the preset stability condition, and based on the active pressure relief failure mechanism of the bottom coal, the blasting pressure relief parameters are circularly optimized according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence; and the secondary blasting unit is configured to perform secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
The beneficial effects are that:
in the bottom coal blasting pressure relief optimization construction method based on the blasting disturbance effect, the primary blasting pressure relief is carried out on the roadway according to the preset blasting pressure relief parameters so as to judge the bottom coal stability of the roadway, when the bottom coal stability of the roadway does not meet the preset stable condition, the secondary blasting pressure relief construction is carried out on the roadway according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence based on the active bottom coal pressure relief failure mechanism.
Based on a pre-constructed base coal active pressure relief failure critical thickness model, obtaining a base coal active pressure relief failure mechanism engineering criterion, and judging whether the roadway primary blasting pressure relief is effective or not; and when the pressure relief fails, the blasting pressure relief parameters of the roadway are circularly optimized by sequentially carrying out numerical simulation and field test on the whole blasting pressure relief process of the roadway, so that the secondary blasting pressure relief of the roadway is effective and reliable. The method is simple and feasible and easy to operate, solves the problem that the bottom coal blasting pressure relief failure is caused by different surrounding environments of the roadway in the traditional method, and resource waste and repeated construction caused by blind blasting pressure relief, ensures blasting pressure relief effect, improves blasting pressure relief construction efficiency, prevents the occurrence of bottom plate rock burst, and ensures safe and efficient production of underground working surfaces.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. Wherein:
fig. 1 is a schematic flow diagram of a bottom coal blasting pressure relief optimization construction method based on blasting disturbance effect according to some embodiments of the present application;
fig. 2 is a schematic diagram of a bottom coal blasting pressure relief optimization construction method based on blasting disturbance effect according to some embodiments of the present application;
FIG. 3 is a schematic diagram of a roadway floor coal seam stress environment provided in accordance with some embodiments of the present application;
FIG. 4 is a schematic diagram of a flexural stress of a coal seam beam provided in accordance with some embodiments of the present application;
FIG. 5 is a schematic illustration of construction prior to non-optimization of burst pressure relief parameters provided in accordance with some embodiments of the present application;
FIG. 6 is a schematic construction diagram after optimization of blasting pressure relief parameters provided in accordance with some embodiments of the present application;
fig. 7 is a schematic structural diagram of a bottom coal blasting pressure relief optimization construction system based on blasting disturbance effect according to some embodiments of the present application.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Various examples are provided by way of explanation of the present application and not limitation of the present application. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present application include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
In the process of researching and applying the bottom coal blasting technology to prevent and treat the bottom plate impact disasters, the key problems which are most important and to be solved urgently are too much to ensure the effective implementation of the bottom coal blasting and the situation of preventing the bottom coal from active pressure relief failure. This has a direct impact on ensuring normal industrial production of coal mines. Aiming at the problem, if the problems can be scientifically, reasonably and qualitatively solved, the phenomena of unnecessary waste of precious resources and active pressure relief failure of the bottom coal caused by blind blasting can be effectively avoided.
Based on the method, the application provides a bottom coal blasting pressure relief optimization construction method based on a blasting disturbance effect, a bottom coal active failure critical thickness model is established, an engineering criterion of a bottom coal active pressure relief failure mechanism is generated, and whether the bottom coal blasting pressure relief is effective or not is judged; aiming at the condition of pressure relief failure, the full-process numerical simulation and the field test of the explosion pressure relief are sequentially carried out on the roadway, so that the cyclic optimization of explosion pressure relief parameters is realized, the effect of secondary explosion pressure relief of the roadway is effectively ensured, the resource waste and repeated construction caused by blind explosion pressure relief are avoided, the explosion pressure relief effect is ensured, the explosion pressure relief construction efficiency is improved, the occurrence of bottom plate rock burst is prevented, and the safe and efficient production of the underground working face is ensured.
As shown in fig. 1 to 4, the bottom coal blasting pressure relief optimization construction method based on the blasting disturbance effect comprises the following steps:
and step S101, performing primary blasting pressure relief on the roadway according to preset blasting pressure relief parameters, and judging the stability of the bottom coal of the roadway based on a pre-constructed active pressure relief failure critical thickness model of the bottom coal.
In the method, the active pressure relief failure critical thickness of the bottom coal after the primary blasting pressure relief construction of the roadway is determined through a constructed active pressure relief failure critical thickness model of the bottom coal; specifically, the constructed active pressure relief failure critical thickness model of the bottom coal is as follows:
；
wherein,
；
in the method, in the process of the invention,the method is characterized in that the active pressure relief failure critical thickness of the bottom coal is obtained after the primary blasting pressure relief construction of the roadway; />All are intermediate mathematical replacement variables, and have no actual physical meaning; />The modulus of elasticity of the coal rock; />The load influence range coefficient is used for supporting the load; />The roadway width; />Respectively the vertical stress and the horizontal stress of the coal seam beam of the roadway; />The number of blastholes for blasting and pressure relief in the roadway; />Is->The explosive in each blast hole transfers the energy to the coal seam beam of the roadway; />For the total energy transferred to the coal seam beam of the roadway; />Is->The distance from each blast hole to the bearing layer of the roadway.
And further, judging whether the bottom coal can actively release and lose efficacy according to the comparison between the critical thickness of the bottom coal for actively releasing and losing efficacy and the actual bottom coal thickness. The stability threshold value of the stability of the bottom coal of the roadway is determined according to the thickness of the bottom coal of the roadway before the first blasting pressure relief construction, the effective blasting depth of the roadway during the first blasting pressure relief construction and the active pressure relief failure critical thickness of the bottom coal of the roadway after the first blasting pressure relief construction. Specifically, the formula is as follows:
；
determining a stability threshold. Wherein (1)>The method is characterized in that the active pressure relief failure critical thickness of the bottom coal is obtained after the primary blasting pressure relief construction of the roadway; />The thickness of bottom coal of the roadway before the first blasting pressure relief construction is set; />The effective blasting depth for the first blasting pressure relief construction of the roadway. In the method, the thickness of the bottom coal before the first blasting pressure relief construction of the roadway is obtained by peeping the actual measurement on the roadway site, namely peeping according to the detection hole>。
According to the formula:
；
determining effective blasting depth of primary blasting pressure relief construction of tunnel. Wherein (1)>Is vertical stress; />The vibration speed is safely allowed when the roadway is blasted and depressurized; />The damping coefficient of blasting impact in the blasting pressure relief process of the roadway; />Is lane of roadThe damping index of the blast impact during the blast relief. Here, a->According to the actual geological difference, the values of different mines are different, specifically, data are obtained through a mine field blasting vibration test, the relation between the vibration speed of a measuring point, the explosive distance and the maximum single-response explosive quantity is obtained through a Sadawski empirical formula, and coefficients related to the propagation geological conditions and the blasting mode can be obtained through linear regression analysis>Values.
In the method, the stability of the bottom coal is judged according to the spatial position relation between the effective blasting depth of the first blasting pressure relief construction of the roadway and the bottom coal bearing layer, namely, whether the effective blasting depth is smaller than the active pressure relief failure critical thickness of the bottom coal is subtracted from the bottom coal thickness of the roadway before the first blasting pressure relief construction, if so, the pressure relief effect of the bottom coal is good, and the blasting pressure relief parameters are not required to be optimized; if the pressure is not smaller than the preset pressure, the risk of active pressure relief failure of the bottom coal exists, and the optimization of the pressure relief parameters of the bottom coal (namely the blasting pressure relief parameters) is required to be carried out.
Specifically, whether the stability of the bottom coal of the roadway meets the stability condition is judged based on the determined stability threshold value. When the stability threshold value is larger than zero, the stability of the bottom coal in the primary blasting pressure relief construction process of the roadway accords with a preset stability condition, namely the bottom coal is stable; when the stability threshold value is less than or equal to zero, the stability of the bottom coal does not meet the preset stability condition and the bottom coal is unstable in the first blasting pressure relief construction process of the roadway. Therefore, the stability of the bottom coal is rapidly and accurately judged.
And step S102, responding to the fact that the stability of the bottom coal of the roadway does not meet the preset stability condition, and performing cyclic optimization on the blasting pressure relief parameters based on the active pressure relief failure mechanism of the bottom coal according to the result of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence.
In this application, through the on-the-spot peeping actual measurement, acquire tunnel geological data, include: working face coal seam occurrence, working face synthetic histogram, coal physical characteristics and the like; then, constructing a roadway model according to the acquired roadway geological data; and carrying out the numerical simulation of the whole blasting pressure relief process based on the roadway model.
And when the stability of the bottom coal of the roadway does not meet the preset stable condition, based on the active pressure relief failure mechanism of the bottom coal, performing cyclic optimization on the blasting pressure relief parameters through the numerical simulation of the blasting pressure relief whole process of the roadway and the combination of field tests. Specifically, based on a roadway model constructed by the acquired roadway geological data, carrying out the numerical simulation of the whole blasting pressure relief process on the roadway so as to adjust blasting pressure relief parameters (loading quantity, burial depth and explosive types) of the blasting pressure relief of the roadway; and verifying rationality of the explosive loading quantity, the burial depth and the explosive type after the adjustment of blasting pressure relief according to the bottom bulging value of the tunnel bottom coal midpoint obtained by numerical simulation.
In the numerical simulation of the whole process of blasting pressure relief of the roadway, the blasting pressure relief simulation of the roadway model is carried out based on the un-optimized blasting pressure relief parameters for carrying out the first blasting pressure relief; judging the stability of the bottom coal during the first blasting pressure relief simulation according to the bottom coal active pressure relief failure critical thickness model; after the explosive loading quantity, the burial depth and the explosive types of the blasting pressure relief are adjusted, continuing to perform secondary blasting pressure relief simulation on the roadway model through numerical simulation, and performing rationality verification on the explosive loading quantity, the burial depth and the explosive types of the blasting pressure relief through the bottom bulge value of the middle point of the roadway bottom coal obtained through the numerical simulation (the bottom bulge value is reduced, and the average bottom bulge value is smaller than 50 mm). And sequentially circulating until the explosive loading amount, the burial depth and the explosive types of the blasting pressure relief obtained through numerical simulation are reasonable. In the process, a deep and shallow hole alternate blasting method is selected, the thickness of a bearing layer is reduced to be below the active pressure relief failure critical thickness of the bottom coal, and the blasting pressure relief parameters are optimized.
And when the loading capacity, the burial depth and the explosive types of the blasting pressure relief obtained through numerical simulation are reasonable, carrying out small-range blasting pressure relief on the roadway according to the loading capacity, the burial depth and the explosive types (namely, the reasonable loading capacity, the burial depth and the explosive types of the blasting pressure relief obtained through numerical simulation) after the blasting pressure relief, and carrying out rationality verification (the bottom drum value is reduced and the average bottom drum value is smaller than 50 mm) on the loading capacity, the burial depth and the explosive types (namely, the reasonable loading capacity, the reasonable explosive types of the blasting pressure relief obtained through numerical simulation) after the blasting pressure relief according to the bottom drum value of the middle point of the bottom coal of the roadway after the small-range blasting pressure relief, the collapse state of the detection hole before and after the small-range blasting pressure relief and the detection hole after the small-range blasting pressure relief.
When the bottom bulging value of the middle point of the roadway bottom coal after the small-range blasting pressure relief is smaller than the bottom bulging value of the primary blasting pressure relief construction; and, based on the technology of peeping the drilling, confirm the detection hole before and after the small-scale blasting pressure relief in the state of deep collapse (namely through peeping the collapse depth position of the detection hole, subtract the collapse depth from the bottom coal thickness, can obtain the thickness of the bearing layer), and appear the gun barrel (the gun barrel indicates that the bottom coal integrity is poor) in the detection hole after the small-scale blasting pressure relief; the adjusted explosive loading, the burial depth and the explosive types for blasting pressure relief are determined to be reasonable, the blasting pressure relief parameters of the roadway are shaped, and secondary blasting pressure relief can be carried out on the roadway according to the shaped blasting pressure relief parameters (namely the explosive loading, the burial depth and the explosive types through the verification of the rationality of the small-range blasting pressure relief). Thereby providing theoretical support for the active pressure relief failure of the bottom coal. Wherein the detection hole represents the distance from the peeping device to the lower depth of the detection hole in terms of depth, namely the length of the peeping device penetrating into the detection hole.
And step S103, performing secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
The secondary blasting pressure relief construction is carried out on the roadway based on the blasting pressure relief parameters passing through the small-range blasting pressure relief rationality verification, namely, the effectiveness judgment of the bottom coal blasting pressure relief and the active pressure relief failure treatment of the bottom coal are carried out on the roadway, so that the problem of the bottom coal blasting pressure relief failure caused by different surrounding environments of the roadway in the traditional method and the resource waste and repeated construction caused by blind blasting pressure relief are avoided, the blasting pressure relief effect is ensured, the blasting pressure relief construction efficiency is improved, the occurrence of bottom plate rock burst is prevented, and the safe and efficient production of the underground working face is ensured.
In a specific example, as shown in fig. 5 and 6, in the optimized blasting pressure relief scheme, a blast hole is arranged in the middle of a roadway according to 90 degrees, two blast holes are respectively constructed at two bottom corners of the roadway according to 45 degrees, the depth of the blast hole reaches the bottom plate rock, the length of a charging section is 1 meter, and the length of a sealing section is 4-7 meters.
In the embodiment of the application, the base coal active pressure relief failure critical thickness of a roadway is determined through the established base coal active failure critical thickness model, and is compared with the actual base coal thickness to obtain a base coal active pressure relief failure mechanism engineering criterion, whether base coal blasting pressure relief is effective or not is judged, and a corresponding parameter optimization method is provided for the condition of pressure relief failure; the optimization method is simple and feasible and easy to operate, solves the problem of bottom coal blasting pressure relief failure and resource waste and repeated construction caused by blind blasting pressure relief caused by different surrounding environments of the roadway in the traditional method, ensures blasting pressure relief effect, improves blasting pressure relief construction efficiency, prevents bottom plate rock burst, and ensures safe and efficient production of underground working surfaces.
The application also provides a bottom coal blasting pressure relief optimizing construction system based on the blasting disturbance effect, as shown in fig. 7, the bottom coal blasting pressure relief optimizing construction system based on the blasting disturbance effect comprises:
the primary blasting unit 701 is configured to perform primary blasting pressure relief on the roadway according to preset blasting pressure relief parameters, and judge the stability of the bottom coal of the roadway based on a pre-constructed bottom coal active pressure relief failure critical thickness model;
the parameter optimization unit 702 is configured to respond to the fact that the stability of the bottom coal of the roadway does not meet the preset stability condition, and based on the active pressure relief failure mechanism of the bottom coal, circularly optimize the blasting pressure relief parameters according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence;
and the secondary blasting unit 703 is configured to perform secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
The bottom coal blasting pressure relief optimization construction system based on the blasting disturbance effect provided by the embodiment of the application can realize the steps and the flow of the bottom coal blasting pressure relief optimization construction method based on the blasting disturbance effect, which are described in any embodiment, and achieve the same technical effects, and are not described in detail herein.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (9)
1. The bottom coal blasting pressure relief optimization construction method based on the blasting disturbance effect is characterized by comprising the following steps of:
step S101, performing primary blasting pressure relief on a roadway according to preset blasting pressure relief parameters, and judging the stability of the bottom coal of the roadway based on a pre-constructed bottom coal active pressure relief failure critical thickness model;
step S102, responding to that the stability of the bottom coal of the roadway does not meet a preset stable condition, and performing cyclic optimization on the blasting pressure relief parameters based on a failure mechanism of the active pressure relief of the bottom coal according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence;
and step S103, performing secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
2. The method for optimizing the construction of the bottom coal blasting pressure relief based on the blasting disturbance effect according to claim 1, wherein in step S101:
determining the active pressure relief failure critical thickness of the bottom coal after the primary blasting pressure relief construction of the roadway based on the active pressure relief failure critical thickness model of the bottom coal;
determining a stability threshold value of the stability of the bottom coal of the roadway according to the thickness of the bottom coal of the roadway before the first blasting pressure relief construction, the blasting depth of the roadway during the first blasting pressure relief construction and the active pressure relief failure critical thickness of the bottom coal of the roadway after the first blasting pressure relief construction;
responding to the stability threshold value being larger than zero, and enabling the stability of the bottom coal to meet a preset stability condition in the first blasting pressure relief construction process of the roadway;
and responding to the stability threshold value being smaller than or equal to zero, wherein the stability of the bottom coal does not meet the preset stability condition in the first blasting pressure relief construction process of the roadway.
3. The blasting disturbance effect-based bottom coal blasting pressure relief optimization construction method according to claim 2, wherein the method is characterized by comprising the following steps of:
；
determining the stability threshold；
Wherein,the active pressure relief failure critical thickness of the bottom coal after the primary blasting pressure relief construction of the roadway is +.>The thickness of the bottom coal of the roadway before the first blasting pressure relief construction is set; />And the effective blasting depth of the first blasting pressure relief construction is the roadway.
4. The blasting disturbance effect-based bottom coal blasting pressure relief optimization construction method according to claim 3, wherein the method is characterized by comprising the following steps of:
；
determining the first blasting pressure relief construction of a roadwayActive pressure relief failure critical thickness of rear bottom coal；
Wherein,
；
in the method, in the process of the invention,the modulus of elasticity of the coal rock; />The load influence range coefficient is used for supporting the load; />The roadway width; />Respectively the vertical stress and the horizontal stress of the coal seam beam of the roadway; />The number of blastholes for blasting and pressure relief in the roadway; />Is->The explosive in each blast hole transfers the energy to the coal seam beam of the roadway; />For the total energy transferred to the coal seam beam of the roadway; />Is->The distance from each blast hole to the bearing layer of the roadway; />Are all intermediate mathematical replacement variables.
5. The blasting disturbance effect-based bottom coal blasting pressure relief optimization construction method according to claim 3, wherein the method is characterized by comprising the following steps of:
；
determining effective blasting depth of the first blasting pressure relief construction of the roadway；
Wherein,is vertical stress; />The vibration speed is safely allowed when the roadway is blasted and depressurized; />The damping coefficient of blasting impact in the blasting pressure relief process of the roadway; />Is the attenuation index of the blasting impact of the roadway in the blasting pressure relief process.
6. The method for optimizing the construction of the bottom coal blasting pressure relief based on the blasting disturbance effect according to claim 1, wherein the step S102 comprises:
based on a roadway model constructed by the acquired roadway geological data, carrying out the overall process numerical simulation of the blasting pressure relief on the roadway so as to adjust blasting pressure relief parameters of blasting pressure relief of the roadway; the blasting pressure relief overall process numerical simulation comprises a primary blasting pressure relief simulation and a secondary blasting pressure relief simulation;
according to the bottom bulging value of the middle point of the roadway bottom coal obtained through numerical simulation, performing rationality verification on the blasting pressure relief parameters after blasting pressure relief adjustment;
responding to the numerical simulation of the whole explosion pressure relief process to determine that the explosion pressure relief parameters after the explosion pressure relief is adjusted are reasonable, and then carrying out small-range explosion pressure relief of not more than 10 meters on the roadway according to the explosion pressure relief parameters after the explosion pressure relief is adjusted;
and verifying rationality of the explosion pressure relief parameters after the explosion pressure relief is adjusted according to the bottom bulging value of the middle point of the roadway bottom coal after the small-range explosion pressure relief, the collapse state of the detection holes before and after the small-range explosion pressure relief and the gun smoke in the detection holes after the small-range explosion pressure relief.
7. The method for optimizing the construction of bottom coal blasting pressure relief based on the blasting disturbance effect according to claim 6, wherein in step S102,
responding to the fact that the bottom bulging value of the middle point of the roadway bottom coal after the small-range blasting pressure relief is smaller than the bottom bulging value of the first blasting pressure relief construction;
and determining the deep collapse state of the detection holes before and after the small-range blasting pressure relief based on a drilling peeping detection technology;
and detecting the occurrence of gun smoke in the hole after the small-range blasting and pressure relief;
the explosion pressure relief parameters after the explosion pressure relief is determined to be adjusted are reasonable.
8. The method for optimizing the construction of the bottom coal blasting pressure relief based on the blasting disturbance effect according to claim 7, wherein in step S103,
and carrying out secondary blasting pressure relief construction on the roadway based on the blasting pressure relief parameters passing the verification of the rationality of the small-range blasting pressure relief.
9. The utility model provides a bottom coal blasting release optimizing construction system based on blasting disturbance effect which characterized in that includes:
the primary blasting unit is configured to perform primary blasting pressure relief on the roadway according to preset blasting pressure relief parameters, and judge the stability of the bottom coal of the roadway based on a pre-constructed bottom coal active pressure relief failure critical thickness model;
the parameter optimization unit is configured to respond to the fact that the stability of the bottom coal of the roadway does not meet the preset stability condition, and based on the active pressure relief failure mechanism of the bottom coal, the blasting pressure relief parameters are circularly optimized according to the results of the numerical simulation and the field test of the whole blasting pressure relief process of the roadway in sequence;
and the secondary blasting unit is configured to perform secondary blasting pressure relief construction on the roadway according to the optimized blasting pressure relief parameters.
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