CN111859712B - Ground advance pre-control method for rock burst of coal mine - Google Patents
Ground advance pre-control method for rock burst of coal mine Download PDFInfo
- Publication number
- CN111859712B CN111859712B CN202010766373.5A CN202010766373A CN111859712B CN 111859712 B CN111859712 B CN 111859712B CN 202010766373 A CN202010766373 A CN 202010766373A CN 111859712 B CN111859712 B CN 111859712B
- Authority
- CN
- China
- Prior art keywords
- fracturing
- impact
- mine
- coal
- mining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 64
- 239000011435 rock Substances 0.000 title claims abstract description 61
- 239000003245 coal Substances 0.000 title claims abstract description 58
- 238000005065 mining Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims description 22
- 238000011156 evaluation Methods 0.000 claims description 12
- 238000009825 accumulation Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000003313 weakening effect Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Forestry; Mining
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/80—Management or planning
- Y02P90/82—Energy audits or management systems therefor
Landscapes
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Strategic Management (AREA)
- General Physics & Mathematics (AREA)
- Economics (AREA)
- Entrepreneurship & Innovation (AREA)
- General Business, Economics & Management (AREA)
- Tourism & Hospitality (AREA)
- Marketing (AREA)
- Game Theory and Decision Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Development Economics (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Operations Research (AREA)
- Quality & Reliability (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Educational Administration (AREA)
- Agronomy & Crop Science (AREA)
- Animal Husbandry (AREA)
- Marine Sciences & Fisheries (AREA)
- Mining & Mineral Resources (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Primary Health Care (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention relates to a ground advance pre-control method for coal mine rock burst. Firstly, identifying the impact tendency of coal and rock mass before coal seam mining, then predicting the mine impact risk based on a comprehensive index method, defining a dangerous area, and fracturing rock stratum in the dangerous area by adopting a ground fracturing technology. In the working face exploitation process, a microseismic monitoring system is adopted to monitor the energy release intensity of the fracture of the overlying strata in real time, and according to the monitoring result, the ground further carries out fracturing weakening on the strata by adopting a hydraulic fracturing technology, so that the prevention and control of rock burst are realized. The method is scientific and reliable, comprehensive in technical means, capable of controlling the rock burst source from the source and wide in application prospect.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a ground advance precontrolling method for rock burst of a coal mine
Background
In the underground coal mining process, rock burst is a large disaster which threatens the safe coal mining, is also the most difficult to control and causes the disaster with the highest casualties rate, and the occurrence frequency of the rock burst is also increasing year by year.
The scholars at home and abroad do a great deal of work on the occurrence mechanism of rock burst, and research shows that stress accumulation and energy release caused by geological power environment, mining disturbance and the like are root causes for inducing the rock burst, and the rock burst mostly occurs in a hard roof mining area, and the roof is not easy to break in the mining process due to high strength and large thickness of the roof, so that the energy accumulation is caused, and the rock burst is easy to induce. However, at present, breakthrough cannot be realized on control of rock burst at home and abroad, control of disasters is limited to passive defense in underground range, the disasters cannot be treated from the source, personnel death and asset loss caused by the disasters cannot be controlled at all times, and safety production of mines is seriously affected.
Thus, how to provide a method for controlling rock burst by surface fracturing before mining is a need in the art.
Disclosure of Invention
The invention aims to provide a ground advance pre-control method for rock burst of a coal mine, which reasonably selects a ground fracturing control means by predicting the occurrence tendency of rock burst, monitors the breaking impact strength of overlying strata in real time in the mining process, and carries out targeted fixed-point control so as to avoid the occurrence of the rock burst, prevent and control impact disasters from the source and realize the safe mining of the mine.
In order to achieve the above object, the present invention provides the following solutions:
drilling holes in the coal bed and the top and bottom plates of the coal bed to obtain a coal rock mass core before mining the coal bed, and measuring the impact tendency of the real-time coal rock mass core to obtain a measuring result; the measurement result is no impact tendency or impact tendency;
if the measurement result shows that the impact tends to occur, performing advanced fracturing control, wherein the advanced fracturing control specifically comprises,
determining impact mine pressure danger grade assessment index W by adopting comprehensive index method t1 And the index W is rated according to the impact mine pressure danger grade t1 Judging whether the mine has impact risk or not;
when the mine has impact danger, establishing a numerical simulation model according to the geological conditions of mining of the working face;
determining a mine dangerous area according to the numerical simulation model, wherein the mine dangerous area is a simulated fracturing position;
and fracturing the actual fracturing positions in the mine corresponding to the simulated fracturing positions by using a ground fracturing process.
Optionally, determining impact mine pressure risk grade assessment index W by adopting a comprehensive index method t1 The calculation formula of (2) is as follows:
wherein: w (W) i An actual evaluation index which is the ith influence factor; w (W) imax Maximum evaluation index for the ith influencing factor in the table; n is n i The number of influencing factors; the influencing factors are the number n of occurrence histories of the impact mine pressure of the same horizontal coal seam in the mining area, the mining depth h, the ratio d of the distance between the hard thick rock stratum in the overburden fracture zone and the coal seam thickness, the ratio gamma of the stress increment caused by construction in the mining area to the normal stress value and the characteristic parameter L of the roof rock stratum thickness st Uniaxial compressive strength R of coal c And coal elastic energy index W ET One or more of the following.
Optionally, the judging whether the mine has impact risk according to the impact mine pressure risk grade rating index specifically includes:
if W is t1 Less than or equal to 0.25, and no impact risk is considered;
if 0.25 < W t1 Less than or equal to 0.5, the impact is determined to be weak;
if 0.5 < W t1 Less than or equal to 0.75, the impact risk is determined to be medium;
if W is t1 > 0.75, then a strong impact hazard is identified; the impact risk is a weak impact risk, a medium impact risk and/or a strong impact risk.
Optionally, the establishing a numerical simulation model according to the geological conditions of the working face specifically includes:
acquiring mining geological conditions of a working face;
setting the mining speed of a working surface;
and establishing a numerical simulation model according to the geological conditions of the mining of the working face, the mining speed of the working face and the actual size 1:1 of the mine.
Optionally, determining a mine dangerous area according to the numerical simulation model, where the mine dangerous area is a simulated fracturing position, specifically including:
simulating a mining process by using the numerical simulation model, and recording an overburden stress accumulation area, a stress concentration coefficient of the overburden stress accumulation area and energy release intensity of overburden fracture in the simulated mining process;
and determining the layer position and the layer fracture position of the overlying strata greater than or equal to the lower limit value of the threshold range of the simulated energy release intensity according to the energy release intensity, and marking the layer position and the layer fracture position as the simulated fracturing position.
Optionally, the fracturing the pre-fracturing position in the actual mine corresponding to the simulated fracturing position by using the ground fracturing process specifically includes:
determining the positions of the layer position and the layer fracture of the overlying strata, of which the energy release intensity is in the simulated energy release intensity threshold range or the stress concentration coefficient is in the simulated stress concentration coefficient range, and respectively marking the positions as vertical fracturing layer positions and vertical fracturing positions;
fracturing the vertical fracturing position by utilizing a vertical well hit to the vertical fracturing layer;
determining the layer position and the layer fracture position of the overlying strata, of which the energy release intensity is larger than the upper limit value of the simulated energy release intensity threshold value range or the stress concentration coefficient is larger than the upper limit value of the simulated stress concentration coefficient range, and respectively marking the layer position and the layer fracture position as a horizontal fracturing layer position and a horizontal fracturing position;
and fracturing the horizontal fracturing position by using the horizontal well hit to the horizontal fracturing position.
Optionally, after the fracturing is performed on the pre-fracturing position in the actual mine corresponding to the simulated fracturing position by using the ground fracturing process, the method further includes:
before coal seam exploitation, arranging a microseismic monitoring system in an advanced roadway to monitor the energy release intensity of the fracture of an overlying strata in real time;
in the exploitation process, determining the horizon of the overlying strata, of which the measured energy release intensity obtained by monitoring is greater than or equal to the measured energy release intensity threshold value, and marking the horizon as a hydraulic fracturing horizon;
fracturing the ground by adopting a hydraulic fracturing well at a position 40-100 m ahead of the hydraulic fracturing layer; and finishing fracturing control operation until the measured energy release intensity is smaller than the measured energy release intensity threshold value.
Optionally, the microseismic monitoring system is a plurality of microseismic monitoring equipment probes, and the plurality of microseismic monitoring equipment probes are uniformly arranged in a range from a working surface to an advanced roadway by 100 m.
Optionally, the determination of the impact propensity of the coal rock mass is in accordance with national standards: GB/T25217.1-2010 "method for determining impact propensity of roof strata" is to be measured.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
1) Predicting the rock burst risk by adopting a comprehensive index method, fully considering all key factors influencing the occurrence of rock burst, and ensuring a scientific and reliable prediction result;
2) The parameters of the numerical simulation model are all taken from the site, the reality and the reliability are realized, the numerical simulation model is built according to the site mining geological conditions 1:1, and the accuracy of the prediction result is ensured; meanwhile, the prediction model is convenient to build and high in operability;
3) The ground fracturing technology is selectively applied according to the prediction result, so that blindness of technology application and unnecessary engineering quantity are avoided, and the advantages of various technologies can be furthest exerted;
4) Compared with the traditional underground control technology, the ground fracturing technology is adopted to carry out fracturing control on the target layer, has strong operability, large control range and good fracturing effect, truly realizes active control on rock burst from the source, and has wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of advanced pre-control of coal mine rock burst ground surface provided by an embodiment of the invention
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a ground advance pre-control method for rock burst of a coal mine, which adopts a ground fracturing technology to carry out advanced fracturing control by predicting the occurrence tendency and dangerous area of the rock burst in advance; in the exploitation process, the energy release intensity of the fracture of the overlying strata is monitored in real time through a microseismic monitoring system, the ground is further subjected to fracturing weakening of the overlying strata by adopting a hydraulic fracturing technology according to the monitoring result, and rock burst prevention and control are realized from the source.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1:
as shown in fig. 1, the method for advanced pre-control of the ground surface of the rock burst of the coal mine provided by the embodiment comprises the following steps:
step 1: drilling holes in the coal bed and the top and bottom plates of the coal bed to obtain a coal rock core before mining the coal bed, and measuring the impact tendency of the coal rock core to obtain a measuring result; the measurement result is no impact or impact.
Specifically, the impact tendency of the steel sheet is classified into three grades of no impact tendency, weak impact tendency and strong impact tendency according to the measurement result; the impact tendency is weak impact tendency or strong impact tendency.
The impact tendency of the coal rock mass is measured according to the national standard: GB/T25217.1-2010 "method for determining impact propensity of roof strata" is to be measured.
If the measurement result shows no impact tendency, no control is needed; if the measurement result is a weak impact tendency or a strong impact tendency, the control is performed according to the following steps.
Step 2: if the measurement result is weak impact trend or strong impact trend, performing advanced fracturing control, wherein the advanced fracturing control specifically comprises,
determining impact mine pressure danger grade assessment index W by adopting comprehensive index method t1 And the index W is rated according to the impact mine pressure danger level t1 Judging whether the mine has impact risk or not.
Impact mine pressure risk rating index W t1 The calculation formula of (2) is as follows:
wherein: w (W) i An actual evaluation index which is the ith influence factor; w (W) imax Maximum evaluation index for the ith influencing factor in the table; n is n i The number of influencing factors; the influencing factors are the number n of occurrence histories of the impact mine pressure of the same horizontal coal seam in the mining area, the mining depth h, the ratio d of the distance between the hard thick rock stratum in the overburden fracture zone and the coal seam thickness, the ratio gamma of the stress increment caused by construction in the mining area to the normal stress value and the characteristic parameter L of the roof rock stratum thickness st Uniaxial compressive strength R of coal c And coal elastic energy index W ET One or more of the following.
Specifically, if W t1 Less than or equal to 0.25, and no impact risk is considered;
if 0.25 < W t1 Less than or equal to 0.5, the impact is determined to be weak;
if 0.5 < W t1 Less than or equal to 0.75, the impact risk is determined to be medium;
if W is t1 > 0.75, then a strong impact hazard is identified;
the impact risk is a weak impact risk, a medium impact risk and/or a strong impact risk.
When the impact mine pressure risk level is determined by adopting a comprehensive index method, the evaluation index of each influence factor is selected according to the following table.
Impact mine pressure risk state factor and index thereof
For example, the influence factors of mining of a certain coal mine are 4, namely the number n of times of occurrence of impact mine pressure of the same horizontal coal seam, the mining depth h, the ratio d of the distance between the hard thick rock stratum in the overburden fracture zone and the coal seam thickness and the ratio gamma of stress increment caused by construction in a mining area to normal stress value. Wherein the actual evaluation index of the occurrence history number n of the impact mine pressure of the same horizontal coal seam is 2; the actual evaluation index of the mining depth h is 3; the actual evaluation index of the ratio d of the distance from the hard thick rock stratum in the overburden fracture zone to the thickness of the coal seam is 3; the actual evaluation index of the ratio γ of normal stress values is 1. The maximum evaluation index for these 4 factors was 3. Then substituting the values into the formula to obtain the impact mine pressure danger grade rating index W t1 =0.75, then it is considered to be a medium impact risk. According to the method, all key factors influencing the occurrence of rock burst are fully considered through a comprehensive index method, so that the impact risk of the mine can be accurately predicted.
If the mine is free of impact danger, control is not needed; if the mine is at low impact risk, medium impact risk and/or high impact risk, the control is performed according to the following steps.
Step 3: when the mine has impact danger, a numerical simulation model is built according to the geological conditions of the working face exploitation.
The establishing process of the numerical simulation model specifically comprises the following steps:
acquiring mining geological conditions of a working face;
setting the mining speed of a working surface;
and establishing a numerical simulation model according to the geological conditions of the mining of the working face, the mining speed of the working face and the actual size 1:1 of the mine, wherein the mining speed of the simulated working face in the numerical simulation model is set according to the actual mining speed on site.
Because the parameters of the numerical simulation model are all taken from the site, the data are real and reliable, thereby ensuring the accuracy of the simulation data and the accuracy of the prediction result, and providing a favorable basis for the exploitation of the subsequent mine.
Step 4: and determining a mine dangerous area according to the numerical simulation model, wherein the mine dangerous area is a simulated fracturing position.
In this embodiment, the step 4 may specifically include:
step 4.1: simulating a mining process by using the numerical simulation model, and recording an overburden stress accumulation area, a stress concentration coefficient of the overburden stress accumulation area and energy release intensity of overburden fracture in the simulated mining process;
step 4.2: and determining the layer position and the layer fracture position of the overlying strata greater than or equal to the lower limit value of the threshold range of the simulated energy release intensity according to the energy release intensity, and marking the layer position and the layer fracture position as the simulated fracturing position.
In practical applications, the lower limit of the threshold range of the analog energy release intensity can be set to be 1 x 10 6 J, when the fracture energy of the overlying strata reaches 1 x 10 6 And (E) recording the position of the horizon of the overlying strata and the position of the stratum fracture when J is above.
Step 5: and fracturing the actual fracturing positions in the mine corresponding to the simulated fracturing positions by using a ground fracturing process.
In this embodiment, the step 5 may specifically include:
step 5.1: and determining the positions of the layer positions and the layer fracture of the overlying strata, of which the energy release intensity is in the simulated energy release intensity threshold range or the stress concentration coefficient is in the simulated stress concentration coefficient range, and respectively marking the positions as vertical fracturing layer positions and vertical fracturing positions.
Step 5.2: and fracturing the vertical fracturing position by utilizing a vertical well hit to the vertical fracturing layer.
Wherein the analog energy release intensity threshold range can be set to 10 6 ～10 7 And J, setting the simulated stress concentration coefficient range to be 1-2, and then adopting a vertical well to fracture according to the layer position and the fracture position of the overlying strata determined by the simulated energy release intensity threshold range or the simulated stress concentration coefficient range so as to adapt to the fracturing working condition of the area and reduce unnecessary engineering quantity.
In this embodiment, the step 5 may further include:
step 5.3: and determining the positions of the layer and the layer fracture of the overlying strata, of which the energy release intensity is larger than the upper limit value of the simulated energy release intensity threshold range or the stress concentration coefficient is larger than the upper limit value of the simulated stress concentration coefficient range, and respectively marking the positions as a horizontal fracturing layer and a horizontal fracturing position.
Step 5.4: and fracturing the horizontal fracturing position by using the horizontal well hit to the horizontal fracturing position.
In practice, the stress concentration coefficient for the stress accumulation region of the overburden is greater than 2, or the energy release strength for fracture of the overburden is 10 7 The horizon of the overlying strata above J and the position of the fracture of the strata can be fractured by adopting a horizontal well when the ground fracturing is carried out, and the extending direction of the horizontal section of the horizontal well is parallel to the mining direction of the working face. The fracturing technology is more suitable for the stress accumulation area of the overlying strata, fully utilizes the horizontal fracturing technology, reduces unnecessary engineering quantity, and simultaneously ensures effective control of rock burst of the area.
The above steps in this embodiment are simulated fracturing processes, which can be used alone or in combination with the rock burst pre-control method in the actual exploitation process, and of course, the rock burst pre-control method in the actual exploitation process can also be used alone, and the technical schemes of the rock burst pre-control methods before exploitation and in exploitation after being arranged and combined are within the scope of the invention. The following details the method of rock burst pre-control in production (described herein in terms of the manner in which the method of rock burst pre-control described above is carried out) are:
step 6: before coal seam exploitation, arranging a microseismic monitoring system in an advanced roadway to monitor the energy release intensity of the fracture of an overlying strata in real time;
the micro-vibration monitoring system is characterized by comprising a plurality of micro-vibration monitoring equipment probes, wherein the plurality of micro-vibration monitoring equipment probes are uniformly arranged in a range from a working surface to an advanced roadway by 100m, and particularly one micro-vibration monitoring equipment probe can be distributed at intervals of 10 m. Therefore, the advanced roadway at different positions can be monitored, and the real-time performance and the comprehensiveness of monitoring are ensured.
Step 7: and in the exploitation process, determining the horizon of the overlying strata, of which the measured energy release intensity obtained by monitoring is greater than or equal to the measured energy release intensity threshold value, and marking the horizon as a hydraulic fracturing horizon.
Step 8: fracturing the ground by adopting a hydraulic fracturing well at a position 40-100 m ahead of the hydraulic fracturing layer; and finishing fracturing control operation until the measured energy release intensity is smaller than the measured energy release intensity threshold value.
It should be noted that, according to the exploitation experience, the measured energy release intensity threshold value in the present embodiment may be set to 1×10 5 J, of course, as the geology changes, the measured energy release intensity threshold may also change, as well, without specific limitation.
Compared with the traditional underground control technology, the method provided by the invention has the advantages that the occurrence tendency and the dangerous area of rock burst are predicted in advance, and the ground fracturing technology is adopted for advanced fracturing control; in the exploitation process, the energy release intensity of the fracture of the overlying strata is monitored in real time through a microseismic monitoring system, the ground is further subjected to fracturing weakening of the overlying strata by adopting a hydraulic fracturing technology according to the monitoring result, and the active control of rock burst is truly realized from the source. The method is scientific and reliable, has comprehensive technical means and has wide application prospect.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The ground advance pre-control method for the rock burst of the coal mine is characterized by comprising the following steps of:
drilling holes in the coal bed and the top and bottom plates of the coal bed to obtain a coal rock mass core before mining the coal bed, and measuring the impact tendency of the real-time coal rock mass core to obtain a measuring result; the measurement result is no impact tendency or impact tendency;
if the measurement result shows that the impact tends to occur, performing advanced fracturing control, wherein the advanced fracturing control specifically comprises,
determining impact mine pressure danger grade assessment index W by adopting comprehensive index method t1 And the index W is rated according to the impact mine pressure danger grade t1 Judging whether the mine has impact risk or not;
when the mine has impact danger, establishing a numerical simulation model according to the geological conditions of mining of the working face;
determining a mine dangerous area according to the numerical simulation model, wherein the mine dangerous area is a simulated fracturing position;
fracturing the actual fracturing position in the mine corresponding to the simulated fracturing position by using a ground fracturing process;
the establishing a numerical simulation model according to the geological conditions of the working face specifically comprises the following steps:
acquiring mining geological conditions of a working face;
setting the mining speed of a working surface;
establishing a numerical simulation model according to the mining geological conditions of the working face, the mining speed of the working face and the actual size 1:1 of the mine;
determining a mine dangerous area according to the numerical simulation model, wherein the mine dangerous area is a simulated fracturing position, and specifically comprises the following steps:
simulating a mining process by using the numerical simulation model, and recording an overburden stress accumulation area, a stress concentration coefficient of the overburden stress accumulation area and energy release intensity of overburden fracture in the simulated mining process;
and determining the layer position and the layer fracture position of the overlying strata greater than or equal to the lower limit value of the threshold range of the simulated energy release intensity according to the energy release intensity, and marking the layer position and the layer fracture position as the simulated fracturing position.
2. The method for advanced ground pre-control of rock burst in coal mine according to claim 1, wherein the comprehensive index method is adopted to determine impact rock burst risk level assessment index W t1 The calculation formula of (2) is as follows:
wherein: w (W) i An actual evaluation index which is the ith influence factor; w (W) imax Maximum evaluation index for the ith influencing factor in the table; n is n i The number of influencing factors; the influencing factors are the number n of occurrence histories of the impact mine pressure of the same horizontal coal seam in the mining area, the mining depth h, the ratio d of the distance between the hard thick rock stratum in the overburden fracture zone and the coal seam thickness, the ratio gamma of the stress increment caused by construction in the mining area to the normal stress value and the characteristic parameter L of the roof rock stratum thickness st Uniaxial compressive strength R of coal c And coal elastic energy index W ET One or more of the following.
3. The method for advanced pre-control of the ground surface of the rock burst of the coal mine according to claim 1, wherein the method for judging whether the mine has impact risk according to the impact mine pressure risk grade rating index comprises the following steps:
if W is t1 Less than or equal to 0.25, and no impact risk is considered;
if 0.25 < W t1 Less than or equal to 0.5, the impact is determined to be weak;
if 0.5 < W t1 Less than or equal to 0.75, the impact risk is determined to be medium;
if W is t1 > 0.75, then a strong impact hazard is identified; the impact risk is a weak impact risk, a medium impact risk and/or a strong impact risk.
4. The method for advanced pre-control of the ground surface of the rock burst of the coal mine according to claim 1, wherein the fracturing of the actual pre-fracturing position in the mine corresponding to the simulated fracturing position by using the ground fracturing technology specifically comprises the following steps:
determining the positions of the layer position and the layer fracture of the overlying strata, of which the energy release intensity is in the simulated energy release intensity threshold range or the stress concentration coefficient is in the simulated stress concentration coefficient range, and respectively marking the positions as vertical fracturing layer positions and vertical fracturing positions;
fracturing the vertical fracturing position by utilizing a vertical well hit to the vertical fracturing layer;
determining the layer position and the layer fracture position of the overlying strata, of which the energy release intensity is larger than the upper limit value of the simulated energy release intensity threshold value range or the stress concentration coefficient is larger than the upper limit value of the simulated stress concentration coefficient range, and respectively marking the layer position and the layer fracture position as a horizontal fracturing layer position and a horizontal fracturing position;
and fracturing the horizontal fracturing position by using the horizontal well hit to the horizontal fracturing position.
5. The method for advanced pre-control of coal mine rock burst ground surface according to claim 4, further comprising, after the fracturing of the actual mine pre-fracturing position corresponding to the simulated fracturing position by using a ground fracturing process:
before coal seam exploitation, arranging a microseismic monitoring system in an advanced roadway to monitor the energy release intensity of the fracture of an overlying strata in real time;
in the exploitation process, determining the horizon of the overlying strata, of which the measured energy release intensity obtained by monitoring is greater than or equal to the measured energy release intensity threshold value, and marking the horizon as a hydraulic fracturing horizon;
fracturing the ground by adopting a hydraulic fracturing well at a position 40-100 m ahead of the hydraulic fracturing layer; and finishing fracturing control operation until the measured energy release intensity is smaller than the measured energy release intensity threshold value.
6. The advanced pre-control method for the rock burst ground of the coal mine according to claim 5, wherein the microseismic monitoring system is a plurality of microseismic monitoring equipment probes, and the plurality of microseismic monitoring equipment probes are uniformly arranged in a range from a working surface to an advanced roadway by 100 m.
7. The method for advanced pre-control of coal mine rock burst ground according to claim 1, wherein the determination of the impact tendency of a real-time coal rock mass core is based on the national standard: GB/T25217.1-2010 "method for determining impact propensity of roof strata" is to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766373.5A CN111859712B (en) | 2020-08-03 | 2020-08-03 | Ground advance pre-control method for rock burst of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766373.5A CN111859712B (en) | 2020-08-03 | 2020-08-03 | Ground advance pre-control method for rock burst of coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111859712A CN111859712A (en) | 2020-10-30 |
| CN111859712B true CN111859712B (en) | 2023-11-21 |
Family
ID=72952718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010766373.5A Active CN111859712B (en) | 2020-08-03 | 2020-08-03 | Ground advance pre-control method for rock burst of coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111859712B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112196536B (en) * | 2020-11-13 | 2022-06-21 | 西安科技大学 | Method for determining advancing speed of rock burst mine coal face based on mining dynamics |
| CN112483180A (en) * | 2020-12-18 | 2021-03-12 | 山东科技大学 | Method for judging impact risk of lateral large mining roof slab structure type by window intervention method |
| CN113847083B (en) * | 2021-10-28 | 2024-03-01 | 重庆大学 | Control method for rock burst of high-level huge-thickness hard top plate area |
| CN114352355B (en) * | 2022-03-15 | 2022-06-24 | 中国矿业大学(北京) | Deep mine rock burst control method |
| CN116258000A (en) * | 2023-02-08 | 2023-06-13 | 中煤科工开采研究院有限公司 | Anti-impact method for artificial liberation layer |
| CN116167223B (en) * | 2023-02-08 | 2024-02-13 | 中煤科工开采研究院有限公司 | Method for determining artificial liberation layer |
| CN115860582B (en) * | 2023-02-28 | 2023-05-26 | 山东科技大学 | Impact risk intelligent early warning method based on self-adaptive lifting algorithm |
| CN117027802B (en) * | 2023-08-15 | 2024-04-23 | 河南理工大学 | Method for preventing and controlling coal mine rock burst in advance in ground horizontal well segmented fracturing area |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322262A (en) * | 2011-09-12 | 2012-01-18 | 山东科技大学 | Colliery isolated island coal column crossheading bump control method |
| CN102977869A (en) * | 2012-12-27 | 2013-03-20 | 重庆大学 | Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology |
| CN105863596A (en) * | 2016-05-05 | 2016-08-17 | 中国矿业大学 | Ultrasonic wave and hydrofracture compound coal-body fracturing simulation device and method for underground coal mine |
| CN108468538A (en) * | 2018-03-23 | 2018-08-31 | 西南石油大学 | A kind of shale hydraulic fracture extension prediction technique |
| CN110792419A (en) * | 2019-10-18 | 2020-02-14 | 太原理工大学 | Coal mine rock burst well up-down advance pre-control method |
| CN110939442A (en) * | 2018-12-12 | 2020-03-31 | 天地科技股份有限公司 | Method for treating rock burst by pressure relief source in ground fracturing area |
| CN111159856A (en) * | 2019-12-12 | 2020-05-15 | 天地科技股份有限公司 | Method for determining pressure-relief and scour-prevention target rock stratum in ground fracturing area |
| CN111322048A (en) * | 2020-02-21 | 2020-06-23 | 中煤科工集团西安研究院有限公司 | Hard roof rock burst subsection direction-control fracturing treatment technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7500519B2 (en) * | 2005-05-20 | 2009-03-10 | Halliburton Energy Services, Inc. | Methods of modifying fracture faces and other surfaces in subterranean formations |
-
2020
- 2020-08-03 CN CN202010766373.5A patent/CN111859712B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322262A (en) * | 2011-09-12 | 2012-01-18 | 山东科技大学 | Colliery isolated island coal column crossheading bump control method |
| CN102977869A (en) * | 2012-12-27 | 2013-03-20 | 重庆大学 | Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology |
| CN105863596A (en) * | 2016-05-05 | 2016-08-17 | 中国矿业大学 | Ultrasonic wave and hydrofracture compound coal-body fracturing simulation device and method for underground coal mine |
| CN108468538A (en) * | 2018-03-23 | 2018-08-31 | 西南石油大学 | A kind of shale hydraulic fracture extension prediction technique |
| CN110939442A (en) * | 2018-12-12 | 2020-03-31 | 天地科技股份有限公司 | Method for treating rock burst by pressure relief source in ground fracturing area |
| CN110792419A (en) * | 2019-10-18 | 2020-02-14 | 太原理工大学 | Coal mine rock burst well up-down advance pre-control method |
| CN111159856A (en) * | 2019-12-12 | 2020-05-15 | 天地科技股份有限公司 | Method for determining pressure-relief and scour-prevention target rock stratum in ground fracturing area |
| CN111322048A (en) * | 2020-02-21 | 2020-06-23 | 中煤科工集团西安研究院有限公司 | Hard roof rock burst subsection direction-control fracturing treatment technology |
Non-Patent Citations (3)
| Title |
|---|
| The effect of loading rate on the behavior of samples composed of coal and rock;Bingxiang Huang等;《ELSEVIER》;第61卷;23-30 * |
| 深部冲击危险矿井多参量预测预报及解危技术研究;赵善坤 等;《煤炭学报》;339-345 * |
| 煤矿井下水力压裂安全保障体系研究;付江伟 等;《煤矿安全》(第01期);151-155 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111859712A (en) | 2020-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111859712B (en) | Ground advance pre-control method for rock burst of coal mine | |
| CN109611143B (en) | Roof hydraulic fracturing multi-parameter comprehensive monitoring system and fracturing effect judging method | |
| Fan et al. | Directional hydraulic fracturing to control hard-roof rockburst in coal mines | |
| CN111270987B (en) | Method for accurately preventing and controlling rock burst in remote area under coal mine | |
| Dou et al. | Prevention and forecasting of rock burst hazards in coal mines | |
| CN209761499U (en) | Roof hydraulic fracturing multi-parameter comprehensive monitoring system | |
| CN104653226B (en) | A kind of division methods of the coal mine rock burst danger zone based on stress gradient | |
| Liu et al. | Sensitivity analysis of the main factors controlling floor failure depth and a risk evaluation of floor water inrush for an inclined coal seam | |
| CN104533443B (en) | A kind of tight roof Rock Burst disasters danger prediction analysis method | |
| Zhang et al. | Assessment of rockburst risk in deep mining: an improved comprehensive index method | |
| CN104239691A (en) | Actual-measurement comprehensive evaluation method for impact risk | |
| CN113958366B (en) | Dynamic quantitative early warning method for impact risk based on vibration-stress double-field monitoring | |
| CN110792419B (en) | Coal mine rock burst well up-down advance pre-control method | |
| CN110645039A (en) | Comprehensive control method for rock burst and gas composite disaster of thick and hard roof | |
| Niu et al. | Identification of potential high-stress hazards in deep-buried hard rock tunnel based on microseismic information: a case study | |
| CN109707453A (en) | A kind of permanent chamber impact Safety Argumentation method of coal mine | |
| Gu et al. | Occurrence mechanism of roof‐fall accidents in large‐section coal seam roadways and related support design for Bayangaole Coal Mine, China | |
| Li et al. | Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions | |
| CN112377256B (en) | Impact danger large-diameter drilling hole inspection method based on microseism monitoring | |
| CN114635754A (en) | Rock burst/rockburst risk early warning evaluation method based on temperature gradient | |
| Sun et al. | Numerical investigation of gob‐side entry retaining through precut overhanging hard roof to control rockburst | |
| CN116595809B (en) | Underground engineering surrounding rock drilling pressure relief-detection evaluation method | |
| CN112324506A (en) | Dynamic early warning method for preventing and controlling rock burst of coal mine based on micro-seismic | |
| CN115288607A (en) | Large-diameter drilling pressure relief method for high horizontal stress area of regional structure | |
| Li et al. | Movement law and discriminant method of key strata breakage based on microseismic monitoring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |