CN104405372A - Method for testing vertical three zone heights of stope cover rock based on high level borehole flow - Google Patents

Method for testing vertical three zone heights of stope cover rock based on high level borehole flow Download PDF

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Publication number
CN104405372A
CN104405372A CN201410506153.3A CN201410506153A CN104405372A CN 104405372 A CN104405372 A CN 104405372A CN 201410506153 A CN201410506153 A CN 201410506153A CN 104405372 A CN104405372 A CN 104405372A
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zone
scale
extraction
high position
height
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杨明
高建良
张学博
侯三中
王晓楠
郭飞鹏
高志扬
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Henan University of Technology
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Henan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention discloses a method for testing vertical three zone heights of a stope cover rock based on high level borehole flow. High level boreholes of which the trends are obliquely intersected are constructed from entity coal in a working face coal roadway to a side unloading area of a goaf; the heights of a caving zone and a diversion fissure zone of the stope cover rock are judged and tested by using drainage data of the high level boreholes of which the trends are obliquely intersected. The method disclosed by the invention is relatively low in test cost, simple in operation and reliable in result. By fully utilizing existing technical equipment and conditions of coal mines, the vertical three zone heights of the stope cover rock can be simply and quickly determined by using flow change of the high level boreholes.

Description

A kind of perpendicular three band height methods of test stope overlying strata based on High Position Drilling flow
Technical field
The invention belongs to the perpendicular three band high computational technical fields of mine stope overlying strata, particularly relate to a kind of perpendicular three band height methods of test stope overlying strata based on high-order oblique boring flow.
Background technology
The pit mining mine of China more than 90% all has Gas, due to the impact of gushing out by goaf gas, face upper corner angle gas exceeding limit happens occasionally, to gush out problem for effectively solving goaf gas, most mine all adopts goaf pressure relief gas pumping mining technology, generally, it is the rich region of high concentration gas in goaf within the scope of overlying strata fissure zone, for coal mining under water bodies technology, after Seam Mining, height of water flowing fractured zone judges working thickness the key technical indexes be adopted and be determined in coal seam whether can, simultaneously overlying strata be caving and cranny development height is also the important evidence determining stope support type and equipment, therefore the perpendicular three band height of stope overlying strata are accurately grasped, to reasonably determining mining up per limit, reduce barrier pillar, abundant reclaiming coal resource, choose reasonable face timbering mode, equipment, rationally determine that goaf gas pressure relief bore position and extraction cycle etc. are significant.
Prior art:
Current coal mining enterprise calculates according to following empirical formula mostly:
1. caving zone high computational formula is:
When a. exploiting single coal bed, caving zone design formulas:
H m = m - W ( K - 1 ) COSα
In formula: m-seam mining thickness, m; W-is caving the sinking of top board in process; α-slanting angle of ore body, °; Hm-caving zone height, m; K is catalase coefficient, is generally 1.10-1.40;
B., during thick seam slicing system, caving zone design formulas is:
Competent bed (σ pressure=40 ~ 80MPa): H m = 100 Σm 2.1 Σm + 16 ± 2.5 ;
Medium ground (σ pressure=20 ~ 40MPa): H m = 100 Σm 4.7 Σm + 19 ± 2.2 ;
Soft stratum (σ pressure=10 ~ 20MPa): H m = 100 Σm 6.2 Σm + 32 ± 1.5 ;
Dead-soft incompetent beds (σ pressure< 10MPa): H m = 100 &Sigma;m 7.0 &Sigma;m + 63 &PlusMinus; 1.2 ;
In formula: H m-caving zone height, m; M-seam mining thickness, m;
2. fissure zone design formulas:
Competent bed (σ pressure=40 ~ 80MPa): H li = 100 &Sigma;m 1.2 &Sigma;m + 2.0 &PlusMinus; 8.9 ;
Medium ground (σ pressure=20 ~ 40MPa): H li = 100 &Sigma;m 1.6 &Sigma;m + 3.6 &PlusMinus; 5.6 ;
Soft stratum (σ pressure=10 ~ 20MPa): H li = 100 &Sigma;m 3.1 &Sigma;m + 5.0 &PlusMinus; 4.0 ;
Dead-soft incompetent beds (σ pressure< 10MPa): H li = 100 &Sigma;m 5.0 &Sigma;m + 8.0 &PlusMinus; 3.0 ;
In formula: H li-fissure zone height, m; M-seam mining thickness, m;
This empirical formula draws in the basic upper returning matching of a large amount of statistics, and each coal mining enterprise can calculate caving zone and fissure zone height simply, efficiently in conjunction with mine coal rock stratum occurrence condition, has certain directive significance to coal mining enterprise.
Be applied to downhole testing at present and comparatively practical method is pouring water into borehole experimental method, namely implement ground (or down-hole) boring, adopt boring both-end shutoff also to inject water under high pressure, judge height of water flowing fractured zone by leak-checking apparatus test variation in water pressure.
Also have the methods such as High Density Resistivity, ultrasonic imaging method, acoustic CT tomography, numerical simulation analysis method at present, for test and the perpendicular three band height of research stope overlying strata.
To sum up, at present mainly through perpendicular three band height of method determination stope overlying strata such as empirical formula calculating, on-the-spot test and numerical simulations, these methods mainly have the following disadvantages:
(1) empirical formula method is the computational methods based on proposing under the coal mining equipment before 15 years and technical level, at present along with the development of Coal Mining Technology, especially the application of high working face full-seam mining technology, each pit mining technical condition, overlying strata strata condition, rock parameter etc. are all not identical, this formula can not meet the needs of current coal-mining technique, the result of calculation of empirical formula is obviously less than normal, has some limitations.
(2) method that field measurement stope overlying strata erect three band height mainly contains drilling hole and injecting water experiment method, High Density Resistivity, ultrasonic imaging method, acoustic CT tomography etc., it is many to there is equipment in these methods, the shortcomings such as apparatus expensive, complicated operation, cost are higher, influence factor is more, adopt when being only limitted to scientific research, more difficultly to apply in coal mining enterprise.
(3) Method for Numerical has carried out a large amount of simplification to down-hole overlying strata and Mining technology condition, human intervention many factors, and reliability of obtaining a result is poor, is difficult to use in Instructing manufacture.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of test stope overlying strata based on High Position Drilling flow perpendicular three band height methods, be intended to solve the complicated operation that existing calculating stope overlying strata erect three band height existence, testing cost is higher, uses and has circumscribed problem.
The embodiment of the present invention realizes like this, a kind of perpendicular three band height methods of test stope overlying strata based on High Position Drilling flow, should construct in the coal petrography entity of direction, goaf from work plane coal road entity coal based on the perpendicular three band height methods of the test stope overlying strata of High Position Drilling flow and move towards oblique High Position Drilling, and utilized the extraction data judging that moves towards oblique High Position Drilling and test stope cover rock caving band, height of water flowing fractured zone.
Further, specifically should comprise the following steps based on the perpendicular three band height methods of the test stope overlying strata of High Position Drilling flow:
Step one, in return airway, in the coal petrography entity of direction, goaf, oblique High Position Drilling is moved towards in construction, and drillhole height is about 13 ~ 15 times of height of mining, and accesses mine extraction system after drilling and sealing;
Step 2, along with the propelling of work plane, boring will progress into overlying strata fissure zone development area by protolith region, finally enters caving zone region, and when boring is positioned at zones of different, extraction scale is different;
Step 3, can the drillhole height situation corresponding when presenting significant change feature of the high drill holes extracting scale according to step 2, determines overlying strata fissure zone or caving zone height.
Further, in step 2, when being positioned at protolith region, hole pumping and mining flow and concentration are all very low; When entering fissure zone when holing by protolith region, its extraction scale exists significantly increases phenomenon suddenly, and in fissure zone, keep higher extraction scale, when entering caving zone when holing from fissure zone, its extraction scale will reduce suddenly, and in caving zone, keep low extraction scale.
The perpendicular three band height methods of test stope overlying strata based on High Position Drilling flow provided by the invention, from work plane coal road entity coal to goaf side relief area, oblique High Position Drilling is moved towards in construction, utilize the extraction data judging and test stope cover rock caving band, height of water flowing fractured zone that move towards oblique High Position Drilling, testing cost is lower, simple to operate, reliable results.The present invention takes full advantage of the existing technical equipment in colliery and condition, adopt the changes in flow rate of High Position Drilling, simply, the perpendicular three band height of stope overlying strata are determined efficiently, solve the complicated operation that existing calculating stope overlying strata erect three band height existence preferably, testing cost is higher, uses and has circumscribed problem.
Accompanying drawing explanation
Fig. 1 is the perpendicular three band height method flow diagrams of the test stope overlying strata based on High Position Drilling flow that the embodiment of the present invention provides;
Fig. 2 is that the High Position Drilling along work plane trend that the embodiment of the present invention provides arranges schematic diagram;
Fig. 3 is that the boring discharge method that the embodiment of the present invention provides measures overlying strata " perpendicular three bands " elevation principle schematic diagram;
In figure: (a) boring does not enter seam area---hole pumping and mining scale is lower;
B () boring starts to enter seam area---and hole pumping and mining scale increases suddenly;
C () boring enters seam area completely---and extraction scale keeps larger;
D () boring enters caving zone---and extraction scale reduces suddenly;
Fig. 4 is the extraction flow of the typical borehole of the test that the embodiment of the present invention provides, concentration and the negative pressure situation of change schematic diagram along with the advance of the face;
Fig. 5 is the situation of change schematic diagram of 2 typical borehole extraction scales along with the advance of the face of the duration of test test that the embodiment of the present invention provides.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the perpendicular three band height methods of the test stope overlying strata based on High Position Drilling flow of the embodiment of the present invention comprise the following steps:
S101: oblique High Position Drilling is moved towards in construction in the coal petrography entity of direction, goaf in return airway;
S102: along with the propelling of work plane, boring will progress into overlying strata fissure zone development area by protolith region, finally enter caving zone region, and when boring is positioned at zones of different, extraction scale is different;
S103: according to the situation of change of hole pumping and mining scale, work plane and boring relative position situation, overlying strata fissure zone or caving zone height can be determined;
In step s 102, namely when being positioned at protolith region, hole pumping and mining flow and concentration are all very low; When entering fissure zone when holing by protolith region, its extraction scale exists significantly increases phenomenon suddenly, and in fissure zone, keep higher extraction scale, when entering caving zone when holing from fissure zone, its extraction scale will reduce suddenly, and in caving zone, keep low extraction scale.
Operating principle of the present invention: High Position Drilling discharge method know-why is, arranges head-on oblique High Position Drilling along work plane trend to goaf side, as shown in Figure 2 in return airway;
In fig. 2, along with the propelling of work plane, boring will progress into overlying strata fissure zone development area by protolith region, finally enters caving zone region.When boring is positioned at zones of different, its extraction concentration is all not identical with the mixed amount of extraction.Namely, as shown in Fig. 3 (a), when boring is positioned at entity coal petrographic province territory, boring is hole and crack agensis around, and hole pumping and mining scale is lower; As shown in Fig. 3 (b), (c), when entering fissure zone when holing by protolith region, its extraction scale exists significantly increases phenomenon suddenly, and in fissure zone, keep higher extraction scale; As shown in Fig. 3 (d), when entering caving zone when holing from fissure zone, owing to leaking out in hole and the impact of the factor such as plug-hole, hole pumping and mining scale will reduce suddenly, and in caving zone, keeping low extraction scale, the changes in flow rate situation of holing during whole extraction as shown in Figure 4, can according to the situation of change of hole pumping and mining scale, work plane and boring relative position situation, determine A point and B point height in Fig. 3, be overlying strata fissure zone and caving zone height.
By following test, effect of the present invention is made additional remarks:
Table 1 is the extraction scale data of 2 typical borehole along with the advance of the face of certain work plane experimental test, and Fig. 5 is the extraction scale variation tendency that test drilling difference is holed when hanging down high.As can be seen from Figure 5, extraction scale has significantly uprushes and falls sharply the stage, and namely No. 1 test drilling tests boring when hanging down high 62.7m in vertical high 66.2m, No. 2 borings, and extraction scale obviously increases suddenly, shows that boring enters fissure zone; When No. 1 test drilling tests boring when hanging down high 10.9m in vertical high 7.7m, No. 2 borings, extraction scale obviously reduces suddenly, shows that boring enters caving zone; Can judge that the caving zone maximum height of this work plane is about 11m accordingly, fissure zone maximum height is about 66m.
Table 12 typical borehole is along with the extraction scale data of the advance of the face
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. the perpendicular three band height methods of the test stope overlying strata based on High Position Drilling flow, it is characterized in that, should be based on the perpendicular three band height methods of the test stope overlying strata of High Position Drilling flow, construct in the coal petrography entity of direction, goaf at stope front coal road and move towards oblique High Position Drilling, utilize the extraction data judging and test stope cover rock caving band, height of water flowing fractured zone that move towards oblique High Position Drilling.
2. as claimed in claim 1 based on the perpendicular three band height methods of test stope overlying strata of High Position Drilling flow, it is characterized in that, specifically should comprise the following steps based on the perpendicular three band height methods of the test stope overlying strata of High Position Drilling flow:
Step one, arrange along work plane trend to goaf side in return airway and head-on move towards oblique High Position Drilling, drillhole height is about 13 ~ 15 times of height of mining, and accesses mine extraction system after drilling and sealing;
Step 2, along with propelling and territory, the goaf cover rock caving of work plane, boring will progress into overlying strata fissure zone development area by protolith region, finally enter caving zone region, when boring is positioned at zones of different, extraction scale is different, being specially boring when entering fissure zone by protolith region, extraction scale exists significantly increases phenomenon suddenly, and in fissure zone, keep higher extraction scale, when entering caving zone when holing from fissure zone, extraction scale will reduce suddenly, and in caving zone, keep low extraction scale;
Step 3, the high drill holes extracting scale variation characteristic according to step 2 and corresponding drillhole height situation, determine overlying strata fissure zone or caving zone height.
3., as claimed in claim 2 based on the perpendicular three band height methods of test stope overlying strata of High Position Drilling flow, it is characterized in that, in step 2, when High Position Drilling is positioned at protolith region, hole pumping and mining concentration and scale are all very low; When boring enters fissure zone, extraction concentration and scale are all higher; When boring is positioned at caving zone, extraction concentration and scale are all lower.
CN201410506153.3A 2014-09-28 2014-09-28 Method for testing vertical three zone heights of stope cover rock based on high level borehole flow Pending CN104405372A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107131002A (en) * 2017-06-22 2017-09-05 中国矿业大学 Adopt the water-retaining method of leakage water resource recharge earth's surface unconsolidated formation in a kind of underground
CN110439463A (en) * 2019-07-31 2019-11-12 江河水利水电咨询中心 Mined-out Area control injected hole pore-creating technique
CN110735629A (en) * 2019-09-26 2020-01-31 天地科技股份有限公司 water guide crack belt height determination method based on upward drilling speed
CN111189755A (en) * 2020-01-07 2020-05-22 重庆大学 Numerical simulation obtaining method for effective storage space of coal mine mining stable area gas
CN111706299A (en) * 2020-06-09 2020-09-25 天地科技股份有限公司 Stoping construction method for waste oil and gas well passing coal face
CN111963109A (en) * 2020-07-20 2020-11-20 西山煤电(集团)有限责任公司钻探分公司 Multi-branch horizontal well coal mining goaf gas extraction process
CN113030430A (en) * 2021-03-17 2021-06-25 中煤科工集团重庆研究院有限公司 Method for measuring and calculating concentration of free coal bed gas in reservoir of mining stable area of coal mine
CN113309567A (en) * 2021-05-26 2021-08-27 河南理工大学 Method for accurately measuring position of coal seam roof fissure zone based on medium-pressure water injection

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1668667A1 (en) * 1988-03-23 1991-08-07 Институт горного дела им.А.А.Скочинского Method for combination mining of gently sloping seams
CN101082283A (en) * 2007-06-29 2007-12-05 淮南矿业(集团)有限责任公司 Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method
CN102654054A (en) * 2011-12-09 2012-09-05 王志强 Method for determining height of caving zone of stope with internal-staggered layer-staggered position type roadway layout
CN103323887A (en) * 2013-07-09 2013-09-25 中煤科工集团重庆研究院 Assessment method and system of coalbed methane reserve volume at coal mining stable region
CN103742127A (en) * 2014-01-20 2014-04-23 天地科技股份有限公司 Drill-hole television detection determination method for heights of overlying-strata caving zone and diversion fissure zone
CN103993878A (en) * 2014-05-26 2014-08-20 中国矿业大学 Water diversion fracture zone height estimating method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1668667A1 (en) * 1988-03-23 1991-08-07 Институт горного дела им.А.А.Скочинского Method for combination mining of gently sloping seams
CN101082283A (en) * 2007-06-29 2007-12-05 淮南矿业(集团)有限责任公司 Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method
CN102654054A (en) * 2011-12-09 2012-09-05 王志强 Method for determining height of caving zone of stope with internal-staggered layer-staggered position type roadway layout
CN103323887A (en) * 2013-07-09 2013-09-25 中煤科工集团重庆研究院 Assessment method and system of coalbed methane reserve volume at coal mining stable region
CN103742127A (en) * 2014-01-20 2014-04-23 天地科技股份有限公司 Drill-hole television detection determination method for heights of overlying-strata caving zone and diversion fissure zone
CN103993878A (en) * 2014-05-26 2014-08-20 中国矿业大学 Water diversion fracture zone height estimating method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
朱红青 等: "平岗煤矿1202工作面上覆岩层"三带"的判定", 《科技导报》 *
杨明 等: "斜交高位钻孔抽采空区瓦斯设计及优化研究", 《中国安全生产科学技术》 *
陈晓东: "采场覆岩竖三带分布规律研究", 《煤炭与化工》 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107131002A (en) * 2017-06-22 2017-09-05 中国矿业大学 Adopt the water-retaining method of leakage water resource recharge earth's surface unconsolidated formation in a kind of underground
CN110439463A (en) * 2019-07-31 2019-11-12 江河水利水电咨询中心 Mined-out Area control injected hole pore-creating technique
CN110735629A (en) * 2019-09-26 2020-01-31 天地科技股份有限公司 water guide crack belt height determination method based on upward drilling speed
CN110735629B (en) * 2019-09-26 2023-08-29 天地科技股份有限公司 Water guide fracture zone height judging method based on upward drilling speed
CN111189755B (en) * 2020-01-07 2022-04-19 重庆大学 Numerical simulation obtaining method for effective storage space of coal mine mining stable area gas
CN111189755A (en) * 2020-01-07 2020-05-22 重庆大学 Numerical simulation obtaining method for effective storage space of coal mine mining stable area gas
CN111706299A (en) * 2020-06-09 2020-09-25 天地科技股份有限公司 Stoping construction method for waste oil and gas well passing coal face
CN111963109B (en) * 2020-07-20 2022-09-16 西山煤电(集团)有限责任公司钻探分公司 Multi-branch horizontal well coal mining goaf gas extraction process
CN111963109A (en) * 2020-07-20 2020-11-20 西山煤电(集团)有限责任公司钻探分公司 Multi-branch horizontal well coal mining goaf gas extraction process
CN113030430A (en) * 2021-03-17 2021-06-25 中煤科工集团重庆研究院有限公司 Method for measuring and calculating concentration of free coal bed gas in reservoir of mining stable area of coal mine
CN113030430B (en) * 2021-03-17 2023-02-17 中煤科工集团重庆研究院有限公司 Method for measuring and calculating concentration of free coal bed gas in reservoir of mining stable area of coal mine
CN113309567A (en) * 2021-05-26 2021-08-27 河南理工大学 Method for accurately measuring position of coal seam roof fissure zone based on medium-pressure water injection
CN113309567B (en) * 2021-05-26 2023-04-25 河南理工大学 Method for accurately determining position of fracture zone of roof of coal seam based on medium-pressure water injection

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