CN110219592B - Three-dimensional networked pressure relief drilling hole arrangement method for realizing sufficient pressure relief of thick coal seam - Google Patents
Three-dimensional networked pressure relief drilling hole arrangement method for realizing sufficient pressure relief of thick coal seam Download PDFInfo
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- CN110219592B CN110219592B CN201910446299.6A CN201910446299A CN110219592B CN 110219592 B CN110219592 B CN 110219592B CN 201910446299 A CN201910446299 A CN 201910446299A CN 110219592 B CN110219592 B CN 110219592B
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- 239000003245 coal Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 title claims description 22
- 239000007787 solid Substances 0.000 claims abstract description 10
- 238000005065 mining Methods 0.000 claims description 8
- 239000011435 rock Substances 0.000 description 10
- 230000005641 tunneling Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a three-dimensional networked pressure relief drill hole arrangement method for realizing full pressure relief of a thick coal seam, which is determined by aiming at the problems of overlarge drill hole distance, insufficient horizontal pressure relief, undersized drill hole distance, easy hole collapse, limited pressure relief range in the longitudinal direction of the coal seam and the like of the conventional arrangement of pressure relief drill holes in a roadway. In a thick coal seam, adjacent roadways between working faces are arranged in a longitudinally staggered manner, wherein an upper row and a lower row of pressure relief drill holes are arranged from the coal wall to the solid coal in the roadway close to the solid coal, and the drill holes rotate towards two sides of the normal line of the coal wall at a certain inclination angle; two rows of upper and lower pressure relief drill holes are arranged on the coal wall of the other roadway towards the solid coal, the normal direction of the pressure relief drill holes is 90 degrees to the coal wall, and the upper and lower rows of drill holes are arranged in a staggered manner, so that three-dimensional networked pressure relief drill holes are formed in the upper and lower roadways, the problem of the distance between the drill holes arranged in a single roadway is solved, and the problem that full-thickness pressure relief cannot be realized in a thick coal seam is solved.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a method for realizing networked drilling hole arrangement of longitudinal and transverse three-dimensional full pressure relief of a thick coal seam.
Background
The occurrence conditions of the coal resources in China are poor, and with the continuous increase of the coal mining depth in China, the stress of the surrounding rock is larger and larger, and the phenomenon of deformation and instability of the surrounding rock is more and more common. In addition, due to the increase of the number of mines in the caving coal mining process, the problems of high difficulty, poor safety, high cost and the like generally exist in the tunneling and maintenance of the deep-well high-stress thick coal seam under the condition of tunneling a roadway along the bottom, and the good supporting benefit is difficult to obtain by common anchor net supporting.
The prior art shows that the pressure relief drilling technology can improve the stress environment of roadway surrounding rocks, namely, drilling is carried out in a coal rock stress concentration area, so that the stress concentration degree of the coal rock in a certain area range around the drilling is reduced, high stress is transferred to the deep part of the coal rock, the unstable coal rock destruction process which possibly occurs is changed into a stable coal rock destruction process, and the function of danger relief of local coal rock is realized.
However, two problems exist with existing pressure relief drilling: firstly, pressure relief drill holes are arranged in the existing roadway of the thick coal seam, the drill hole spacing is too large, pressure relief is insufficient in the transverse direction, the drill hole spacing is too small, and holes are easy to collapse; secondly, the thick coal seam can not realize full pressure relief longitudinally under the influence of the thickness of the coal seam and the height of a roadway.
The invention content is as follows:
aiming at the defects of the prior art, the invention aims to provide a three-dimensional networked pressure relief drilling hole arrangement method for realizing full pressure relief of a thick coal seam so as to realize longitudinal and transverse three-dimensional full pressure relief of mining of the thick coal seam.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-dimensional networked pressure relief drilling hole arrangement method for realizing full pressure relief of a thick coal seam comprises the following steps:
I. in the thick coal seam mining process, three-dimensional stoping roadways are arranged, namely two adjacent roadways between working faces form a staggered arrangement mode;
II. According to the occurrence properties of the coal body, determining parameters such as aperture, depth and spacing in the full coal thickness range;
III, arranging an upper row and a lower row of horizontal pressure relief drill holes in the roadway close to one side of the solid coal in two adjacent roadways, and respectively rotating at a certain angle to the left and the right by taking the normal line of the coal wall as an axis;
IV, arranging two rows of upper and lower horizontal drill holes towards one side of the solid coal in the other roadway, keeping the normal vertical to the coal wall, and arranging the upper and lower rows of drill holes in a staggered manner.
In the step I, the staggered arrangement mode between the adjacent working faces is a staggered layer position inner staggered roadway arrangement mode.
In the step II, the drilling depth is larger than the width of the lane limit balancing area.
In the step III, the rotation angle is 15-20 degrees.
And in the step IV, the staggered distance of the upper row of the drill holes and the lower row of the drill holes is half of the distance between the drill holes.
Compared with the prior art, the method adopts staggered-layer internal staggered roadway arrangement for the thick coal seam to form a three-dimensional roadway system. On the basis, two rows of drill holes are respectively arranged on the solid coal sides of the upper and lower adjacent roadways to form three-dimensional networked pressure relief drill holes, so that the problem of the distance between the single roadway arrangement drill holes is solved, and the problem that full-thickness pressure relief cannot be realized in a thick coal seam is solved.
Drawings
FIG. 1 is a schematic diagram of a staggered-layer internal staggered roadway layout;
FIG. 2 is a top view of the upper section return airway side bore arrangement;
FIG. 3 is a top view of the lower section air intake roadway side bore arrangement;
fig. 4 is a schematic diagram of a three-dimensional networked pressure relief borehole placement method.
In the figure:
1-upper section return airway; 2-lower section air inlet lane; 3, drilling holes in the upper section return airway; 4, drilling holes in the lower row of the return airway of the upper section; 5, drilling holes in the upper row of the lower section air inlet roadway; 6-drilling holes in the lower section of the air inlet gallery;
detailed description of the preferred embodiments
The present invention will be described in detail below with reference to the accompanying drawings.
In the embodiment, in the first step, in the process of thick coal seam mining, two stoping roadways on a working face are arranged along different layers of a coal seam to form three-dimensional staggered arrangement; the staggered arrangement between the adjacent working faces adopts a staggered position internal staggered roadway arrangement mode. The section air return roadway is arranged along the top plate of the coal seam, and the section air inlet roadway is arranged along the bottom plate of the coal seam. The upper section return airway 1 and the lower section intake airway 2 form a three-dimensional spatial relationship in the longitudinal direction.
Secondly, determining the aperture R in the full coal thickness range according to the occurrence properties of the coal body0Depth h and spacing a;
the bore hole diameter R0The diameter of the drill hole is 0.09-0.13 m, and the drill hole with large aperture can be selected as much as possible according to actual conditions.
The upper lane drilling depth h1And the drilling depth h of the lower lane2Can balance the area width x according to the limit0And (6) performing calculation. x is the number of0Can be used for dredgingObtained through field actual measurement or theoretical calculation.
The upper section return airway side drilling depth h1Comprises the following steps:
lower section air intake roadway side drilling depth h2Comprises the following steps:
wherein: m is a correction coefficient and takes the value of 1-2; beta is the horizontal rotation angle of the drill hole; x is the number of0A limit balancing area width; m is the coal seam mining thickness; a is a side pressure coefficient;
the internal friction angle of the coal seam interface; c0The cohesion of the coal seam interface; k is the stress concentration coefficient; gamma is the average volume weight of the rock stratum; h is the buried depth of the roadway; pxThe support resistance to the coal side is adopted; and L is the width of the roadway.
The borehole spacing a may be calculated according to the following equation:
wherein: n is a correction coefficient, and 1.5-2.5 is taken; rpIs the drilling plastic zone radius; r0The radius of the borehole; sigmayIs a vertical stress; c is the cohesion of the coal body;
the internal friction angle of the coal body; lambda is a lateral pressure coefficient; θ, circumferential angle.
And thirdly, arranging an upper row and a lower row of horizontal pressure relief drill holes in an upper section return airway close to one side of the solid coal in two adjacent roadways, wherein the row spacing range b of the upper row of drill holes and the row spacing range a of the lower row of drill holes are the same as the spacing range a, and the adjustment can be carried out according to the actual situation. The upper row of drill holes and the lower row of drill holes respectively rotate at a certain angle to the left and the right by taking the normal line of the coal wall as an axis, the rotation angle beta is 15-20 degrees, and the drilling construction process is carried out simultaneously with the tunneling as much as possible;
fourthly, arranging two rows of upper and lower horizontal drill holes towards one side of the solid coal in the lower section air inlet roadway, keeping the vertical direction with the normal of the coal wall, and enabling the values of the distance a and the rejection b to be the same as those in the third step. The upper row of drill holes and the lower row of drill holes are arranged in a staggered mode, preferably, the staggered distance of the upper row of drill holes and the lower row of drill holes is half of the distance of the drill holes, and the drilling construction process and the roadway tunneling process are carried out simultaneously as far as possible.
Claims (4)
1. A three-dimensional networked pressure relief drilling hole arrangement method for realizing full pressure relief of a thick coal seam comprises the following steps:
a. in the thick coal seam mining process, three-dimensional stoping roadways are arranged, namely, two adjacent roadways between working faces form a staggered layer position internal staggered arrangement mode;
b. according to the occurrence properties of the coal body, determining parameters of aperture, depth and spacing in the full coal thickness range;
c. in the upper section roadway of two adjacent roadways, an upper row and a lower row of horizontal pressure relief drill holes are arranged on one side close to the solid coal, and rotate at a certain angle to the left and the right respectively by taking the normal line of the coal wall as an axis;
d. in the lower section roadway of two adjacent roadways, an upper row and a lower row of horizontal drill holes are arranged towards one side of the solid coal and are vertical to the normal line of the coal wall, and the upper row and the lower row of drill holes are arranged in a staggered manner.
2. The method according to claim 1, wherein in step b, the depth of the drilled hole is greater than the width of the threshold equilibrium area of the roadway wall.
3. The method according to claim 1, wherein in step c, the rotation angle is 15 ° to 20 °.
4. The method according to claim 1, wherein in step d, the upper and lower rows of boreholes are staggered by half the distance between boreholes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910446299.6A CN110219592B (en) | 2019-05-27 | 2019-05-27 | Three-dimensional networked pressure relief drilling hole arrangement method for realizing sufficient pressure relief of thick coal seam |
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| CN201910446299.6A CN110219592B (en) | 2019-05-27 | 2019-05-27 | Three-dimensional networked pressure relief drilling hole arrangement method for realizing sufficient pressure relief of thick coal seam |
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| CN110219592B true CN110219592B (en) | 2022-04-26 |
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| CN112115599B (en) * | 2020-09-10 | 2022-09-30 | 大同煤矿集团有限责任公司 | Method for calculating hole spacing of weakened top plate of intensive drilling |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532374A (en) * | 2003-03-18 | 2004-09-29 | 淮南矿业(集团)有限责任公司 | Method for pumping out gas from mining coal layer roof |
| CN1534164A (en) * | 2003-03-28 | 2004-10-06 | 淮南矿业(集团)有限责任公司 | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| CN1693654A (en) * | 2005-06-02 | 2005-11-09 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN106014473A (en) * | 2016-02-03 | 2016-10-12 | 中国矿业大学(北京) | Cross drilling constrained expansion network anti-reflection gas drainage method |
| CN106437744A (en) * | 2016-09-26 | 2017-02-22 | 中国矿业大学(北京) | Combined supporting method achieving inclined coal seam double-roadway arrangement and three-dimensional tunneling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060201715A1 (en) * | 2003-11-26 | 2006-09-14 | Seams Douglas P | Drilling normally to sub-normally pressured formations |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532374A (en) * | 2003-03-18 | 2004-09-29 | 淮南矿业(集团)有限责任公司 | Method for pumping out gas from mining coal layer roof |
| CN1534164A (en) * | 2003-03-28 | 2004-10-06 | 淮南矿业(集团)有限责任公司 | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method |
| CN1693654A (en) * | 2005-06-02 | 2005-11-09 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN106014473A (en) * | 2016-02-03 | 2016-10-12 | 中国矿业大学(北京) | Cross drilling constrained expansion network anti-reflection gas drainage method |
| CN106437744A (en) * | 2016-09-26 | 2017-02-22 | 中国矿业大学(北京) | Combined supporting method achieving inclined coal seam double-roadway arrangement and three-dimensional tunneling |
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