CN105807312A - Coal mine roof rock mass vertical zone determination method based on micro-seismic monitoring - Google Patents
Coal mine roof rock mass vertical zone determination method based on micro-seismic monitoring Download PDFInfo
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Abstract
The invention belongs to the technical field of coal mine safety production and mining engineering, and relates to a coal mine roof rock mass vertical zone determination method based on micro-seismic monitoring. The technical effect of providing a coal mine roof rock mass vertical zone determination method based on micro-seismic monitoring is achieved. In the deformation and destruction process of roof rock mass, micro destroy is generated inevitably to cause energy release of the rock mass. As rock mass deformation and destruction have difference between zones, distribution of generated micro destroy and distribution of released energy have difference inevitably in the deformation and destruction process, and therefore micro-seismic monitoring is an essence monitoring method approaching roof rock mass zoning. Compared with other measurement modes, the coal mine roof rock mass vertical zoning determination method has an important advantage that the roof zones can be monitored without drilling.
Description
Technical field
The invention belongs to the technical field such as Safety of Coal Mine Production and mining engineering, relate to a kind of coal mine roof plate rock mass vertical zoning defining method based on micro seismic monitoring.
Background technology
Coal mine roof plate divides the several basic problems exploited with problem as mine underground, and the major issues such as earth's surface deformation, down-hole supporting, gas drainage under suction and top board water damage are had large effect, and therefore a lot of scholars have carried out the research of strata movement aspect.
The Main Viewpoints theoretical currently, with respect to coal mine roof plate is three band theory caving zones, fissure zone and warp damage and four band stoichiometric region caving zones, fissure zone, spreading belt and pressure-bearing band.Determine that rock stratum divides the height of band mainly to have vertical drilling observational technique, numerical simulation and analog simulation.These methods are determined for the height of theory of hierarchies and deepen the understanding of rock mass deformation and destructive characteristics in each subregion is played a role.But these methods there is also some problems, numerical simulation and analog simulation method has often carried out a large amount of simplification to on-site actual situations, from but its result is difficult to apply to scene.And vertical drilling observational technique derives to on-the-spot direct observation, but it has two bigger shortcomings: first, on-the-spot due to cost control, often the boring of useful observation top board layering is often fewer, and actual roof rock mass height is often because differences such as structure, lithology, and bigger difference occurs, thus cause the inaccurate of boring monitoring result；Second, the object of boring observation is mainly macrocrack, and therefore this results in vertical drilling observational technique and is often determining that water flowing fractured zone application is more, and can not be applied to that rock mass top board divides band very well enter a refinement and on deformation behaviour determines.
Owing to rock-forming time and mineralogical composition are different, coal measure strata defines the multilamellar rock stratum that thickness does not wait, intensity is different, and wherein one layer is played main control action to number thickness hard formation in the moving process of Overlying Strata In A Face.On this basis, Qian Minggao proposes the vital edge of CONTROL OF STRATA MOVEMENT.In recent years, vital edge is also greatly developed.But it is less that the existence of key stratum and roof strata divide the relation between band but to study.
Micro seismic monitoring is as a kind of rock mass micro rupture three dimensions monitoring technology, obtain and develop rapidly, microseism mainly monitors rock mass fragile material under external force, occur micro rupture time, sky, strong (time, space, intensity) and relevant focal shock parameter.
It was verified that On Microseismic Monitoring Technique is monitoring rock mass damage and the strong means of one with rock mass damage Related Disasters problem.But the research that key stratum, roof rock mass divide the relation being with between microseism pests occurrence rule is less, and carries out the research of relation between them, significant for the understanding deepening key stratum, top board are divided band.
Summary of the invention
The technical problem to be solved is to provide a kind of coal mine roof plate rock mass based on micro seismic monitoring and divides band defining method.In the deformation and failure process of roof rock mass, necessarily lead to micro-destruction, thus causing that rock mass generation energy discharges.Owing to rock mass deformation and destruction there are differences between point band with point band, in deformation and failure process, the micro-destruction distribution produced and the distribution released energy also certainly exist difference, and therefore, micro seismic monitoring is also a kind of essential monitoring method dividing band close to roof rock mass.Microseism, relative to other metering systems, has a critically important advantage: just can realize top board is divided the monitoring of band without drilling.
Technical scheme:
A kind of coal mine roof plate rock mass vertical zoning defining method based on micro seismic monitoring, step is as follows:
1) set up Microseismic monitoring system in monitored colliery, lay including sensing and data transmission line builds
Basic principle laid by microseism cymoscope: 1. track lane and transportation roadway are moving towards direction and depth direction is interlaced arrangement along colliery；2. non-producing side it is arranged in；3. in track lane or transportation roadway, microseism detector interval is at 100m, and local location detector interval is encrypted to 60m；4. microseism cymoscope is arranged in hard rock, is close to crag；5. microseism cymoscope is staggered in level and in vertical direction, arranges around target area to be monitored；
Data transmission link builds: the 1. corresponding relation between underground work station and microseism cymoscope: lay basic principle, monitoring purpose and the actual geological condition of coal mine work area to be monitored according to microseism cymoscope, determine that orientation arranged by microseism cymoscope, after installing microseism cymoscope, by microseism cymoscope by cross section 0.75mm2-1.00mm23 core ribbon shielded communication cables be connected to underground work station；The corresponding relation of microseism cymoscope and underground work station is determined by Knock test；2. the data communication relation between underground work station and surface data storage and processing terminal: underground work station adopts series system to transmit data (see Fig. 1), micro seismic monitoring real time data is obtained by microseism cymoscope, then passing through cable and be sent to underground work station, underground work station is sent to surface data storage and processing terminal (see Fig. 1) by switch, optical-electrical converter and optical fiber.
2) determining filtering, microseismic event location and focal shock parameter successively: the underground work station after series connection is connected with being arranged on ground storage server by optical fiber, the storage server that the Wave data monitored passes to ground in real time is filtered, microseismic event judges, microseismic event positions and the determination of focal shock parameter；
3) determine that coal mine work area top board microseismic event number to be monitored and microseism release energy the regularity of distribution vertically, determining characteristic point and absolute altitude (see Fig. 2) thereof that microseismic event is distributed along depth direction, characteristic point includes: the minimum point of microseismic event number in the above rock mass of top board, microseismic event number start the abnormity point in an abnormity point in the point of increase rapidly, microseismic event number increase process rapidly, microseismic event number peak and microseismic event reduction process rapidly.
4) absolute altitude according to features described above point, in conjunction with the geotechnical boring column table (see table 1) of monitored coal mine work area, utilizes key stratum to need the condition met, it is determined that the layer position of key stratum.
Key stratum needs the condition met: 1. geometric properties: other identical depth of stratum is thicker relatively；2. lithological features: other rock stratum is comparatively hard relatively, namely elastic modelling quantity is relatively big, and intensity is higher；3. deformation behaviour: when key stratum sinks deformation, whole or local rock formation the deflection of its overlying is synchronous coordination with it；4. fracture characteristics: key stratum disrumpent feelings causes all or local overlying rock disrumpent feelings, causes the strata movement in a big way；5. support features: key stratum destroys the front version with plate (or being reduced to beam), as the carrying main body of whole rock stratum or local rock formation, if it is stable to meet rock block structured S-R after fracture, then becomes masonry girder construction, continues to become carrying main body.
5) based on key stratum be two points of top board band demarcation line academic thought, the layer position according to key stratum, it is determined that coal mine roof plate rock mass point band (see table 1).
Beneficial effects of the present invention: 1. realize the dynamic monitoring that coal mine roof plate destroys, it is simple to determine key position layer by layer and determine that top board divides band and height；2. divide band situation according to top board, the major issue such as arrangement of boring holes of the deformation of research earth's surface and down-hole supporting and gas discharge in mine is significant.
Accompanying drawing explanation
Fig. 1 be underground work station and and surface data storage with processing terminal between data flow schematic diagram.
In figure: arrow is the flow direction being obtained micro seismic monitoring real time data by microseism cymoscope.
Fig. 2 is top board microseismic event number vertically scattergram.
Fig. 3 is top board microseismic event energy vertically scattergram.
Fig. 4 is that coal mine roof plate rock mass divides band flow chart.
In figure: the minimum point of the above microseismic event number in the corresponding coal seam of A point, the above microseismic event number in the corresponding coal seam of B point starts the point of increase rapidly, an abnormity point in the above microseismic event number increase process rapidly in the corresponding coal seam of C point, the point that the corresponding coal seam of D point above microseismic event number is maximum, the abnormity point in the above microseismic event reduction process rapidly in the corresponding coal seam of E point.
Detailed description of the invention
Attached below in conjunction with in embodiments of the invention, carries out clear, complete description to technical scheme.The invention discloses a kind of coal mine roof plate rock mass based on micro seismic monitoring and divide band defining method, described method comprises the steps of:
1) set up Microseismic monitoring system in monitored colliery, carry out microseism cymoscope and route arrangement according to the concrete condition of work surface.
2) filtering, microseismic event location and focal shock parameter are determined successively.
3) determine that face roof microseismic event to be monitored releases energy along the regularity of distribution of depth direction, it is determined that the characteristic point that microseismic event is distributed along depth direction.
4) judge the absolute altitude of these characteristic points, in conjunction with monitored geotechnical boring block diagram, utilize the condition that key stratum need meet, it is determined that the layer position of key stratum.
5) the layer position according to key stratum, it is determined that point band of coal mine roof plate rock mass.
Case study on implementation
(1) set up Microseismic monitoring system in monitored colliery, carry out microseism cymoscope and route arrangement according to the concrete condition of work surface.Microseism cymoscope is arranged in hard rock, is close to crag.The often group microseism cymoscope of mine floor to be detected is connected with cable respectively, then is connected with the microseism data collection Monitor Sub-Station of Less arranged within coal mines, form a complete monitoring net.Microseism cymoscope deployment scenarios has two kinds: the first, as it can be seen, when underworkings space satisfies the requirements, adopt and respectively arrange 15 microseism cymoscopes along both sides, tunnel, microseism detector interval controls between 50m-100m；The second, when underworkings space does not satisfy the requirements, 15 cymoscopes are adopted to be arranged in a tunnel, the boring installing microseism cymoscope should be distributed the both sides in same tunnel, to avoid microseism cymoscope on same straight line, install microseism cymoscope boring should towards different directions, to avoid microseism cymoscope at grade.
(2) determining filtering, microseismic event location and focal shock parameter successively: microseism data is gathered Monitor Sub-Station of Less and is connected with being arranged on ground storage server by optical fiber, the storage server that the Wave data monitored passes to ground in real time is filtered, microseismic event judges, microseismic event positions and the determination of focal shock parameter.After coal work proceeds by, the micro seismic monitoring data of 24 hours uninterrupted sampling work surfaces, in gatherer process, reply face advance and work surface geological condition carry out itemized record.
(3) according to top board micro seismic monitoring result, analyze top board microseismic event and release energy along the regularity of distribution of depth direction, analyze the characteristic point that top board microseismic event number is distributed along depth direction, these characteristic points mainly include, the minimum point of microseismic event (energy) and peak and slope variation point etc. in the above rock mass of top board.
(4) judge the absolute altitude of these characteristic points, in conjunction with monitored geotechnical boring block diagram, utilize the condition that key stratum need meet, it is determined that the layer position of key stratum.
(5) the layer position according to key stratum, it is determined that point band of coal mine roof plate rock mass.
The determination of the Seam Floor Failure degree of depth can be provided a kind of means by described method, and describes accurately, is applied to follow-up study, has important practical significance.Divide band to provide a kind of new method for coal mine roof plate, divide band according to top board simultaneously, the major issues such as the arrangement of boring holes of the deformation of research earth's surface and down-hole supporting and gas discharge in mine are significant.
Table 1 work surface geotechnical boring and top board divide band situation
Claims (1)
1. the coal mine roof plate rock mass vertical zoning defining method based on micro seismic monitoring, it is characterised in that step is as follows:
1) set up Microseismic monitoring system in monitored colliery, lay including sensing and data transmission line builds
Basic principle laid by microseism cymoscope: 1. track lane and transportation roadway are moving towards direction and depth direction is interlaced arrangement along colliery；2. non-producing side it is arranged in；3. in track lane or transportation roadway, microseism detector interval is at 100m, and local location detector interval is encrypted to 60m；4. microseism cymoscope is arranged in hard rock, is close to crag；5. microseism cymoscope is staggered in level and in vertical direction, arranges around target area to be monitored；
Data transmission link builds: the 1. corresponding relation between underground work station and microseism cymoscope: lay basic principle, monitoring purpose and the actual geological condition of coal mine work area to be monitored according to microseism cymoscope, determine that orientation arranged by microseism cymoscope, after installing microseism cymoscope, by microseism cymoscope by cross section 0.75mm2-1.00mm23 core ribbon shielded communication cables be connected to underground work station；The corresponding relation of microseism cymoscope and underground work station is determined by Knock test；2. the data communication relation between underground work station and surface data storage and processing terminal: underground work station adopts series system to transmit data, micro seismic monitoring real time data is obtained by microseism cymoscope, then passing through cable and be sent to underground work station, underground work station is sent to surface data storage and processing terminal by switch, optical-electrical converter and optical fiber；
2) determining filtering, microseismic event location and focal shock parameter successively: the underground work station after series connection is connected with being arranged on ground storage server by optical fiber, the storage server that the Wave data monitored passes to ground in real time is filtered, microseismic event judges, microseismic event positions and the determination of focal shock parameter；
3) determine that coal mine work area top board microseismic event number to be monitored and microseism release energy the regularity of distribution vertically, it is determined that characteristic point that microseismic event is distributed along depth direction and absolute altitude thereof；Characteristic point includes the minimum point of microseismic event number in the above rock mass of top board, microseismic event number starts the abnormity point in an abnormity point in the point of rapid increase, microseismic event number increase process rapidly, microseismic event number peak and microseismic event reduction process rapidly；
4) absolute altitude according to features described above point, in conjunction with the geotechnical boring column table of monitored coal mine work area, utilizes key stratum to need the condition met, it is determined that the layer position of key stratum；
Key stratum needs the condition met: 1. geometric properties: other identical depth of stratum is thicker relatively；2. lithological features: other rock stratum is comparatively hard relatively, namely elastic modelling quantity is relatively big, and intensity is higher；3. deformation behaviour: when key stratum sinks deformation, whole or local rock formation the deflection of its overlying is synchronous coordination with it；4. fracture characteristics: key stratum disrumpent feelings causes all or local overlying rock disrumpent feelings, causes the strata movement in a big way；5. support features: key stratum destroys the front version with plate (or being reduced to beam), as the carrying main body of whole rock stratum or local rock formation, if it is stable to meet rock block structured S-R after fracture, then becomes masonry girder construction, continues to become carrying main body；
5) based on key stratum be two points of top board band demarcation line academic thought, the layer position according to key stratum, it is determined that coal mine roof plate rock mass point band.
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| CN107515419A (en) * | 2017-08-25 | 2017-12-26 | 平安煤炭开采工程技术研究院有限责任公司 | The method of estimation and device of rock stability |
| CN109085645A (en) * | 2018-09-19 | 2018-12-25 | 东北大学 | A kind of recognition methods of the crack rock fracture grouting range of scatter based on micro seismic monitoring |
| CN111005722A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Well arrangement method for governing rock burst at pressure relief source of ground fracturing area |
| CN112780340A (en) * | 2021-01-05 | 2021-05-11 | 陕西彬长孟村矿业有限公司 | Method for preventing rock burst in advance in coal mine underground and upper regions |
| CN113404535A (en) * | 2021-07-07 | 2021-09-17 | 陕西彬长孟村矿业有限公司 | Method for preventing rock burst by hydraulic fracturing of coal mine underground |
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| CN113982680A (en) * | 2021-10-11 | 2022-01-28 | 北京科技大学 | Coal mine multilayer key layer fracture type mine earthquake energy calculation and maximum mine earthquake prediction method |
| CN114935513A (en) * | 2022-07-26 | 2022-08-23 | 四川中水成勘院工程物探检测有限公司 | Method for predicting generation and expansion of concrete dam body crack based on microseismic signal characteristics |
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| CN111005722A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Well arrangement method for governing rock burst at pressure relief source of ground fracturing area |
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| CN112780340B (en) * | 2021-01-05 | 2023-08-29 | 陕西彬长孟村矿业有限公司 | Method for preventing rock burst in advance in underground coal mine area |
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| CN113738448A (en) * | 2021-09-13 | 2021-12-03 | 中国矿业大学 | Mining rock mass seepage and water inrush near-far multisource grading information intelligent monitoring and early warning method |
| CN113982680A (en) * | 2021-10-11 | 2022-01-28 | 北京科技大学 | Coal mine multilayer key layer fracture type mine earthquake energy calculation and maximum mine earthquake prediction method |
| WO2023226396A1 (en) * | 2022-05-25 | 2023-11-30 | 中煤科工开采研究院有限公司 | Overlying rock damage height determination method and apparatus, electronic device and storage medium |
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