CN102777169B - Gas pressure angle of depression measuring method and system - Google Patents
Gas pressure angle of depression measuring method and system Download PDFInfo
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- CN102777169B CN102777169B CN201210248480.4A CN201210248480A CN102777169B CN 102777169 B CN102777169 B CN 102777169B CN 201210248480 A CN201210248480 A CN 201210248480A CN 102777169 B CN102777169 B CN 102777169B
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Abstract
The invention provides a kind of gas pressure angle of depression measuring method and system.The method comprises: around measured hole position to be drilled, get out multiple auxiliary injected hole; Shutoff slurries are injected respectively to auxiliary injected hole; After the shutoff slurries in auxiliary injected hole solidify completely, get out measured hole in the position of measured hole to be drilled, inject shutoff slurries wherein; Shutoff slurries in metering-orifice to be measured solidify to be formed completely to be measured behind block section, then penetrates block section and continue to creep into, with formed be connected with described coal seam to be measured insert hole; Piezometer tube and Grouting Pipe is inserted to inserting in hole, and inserting hole close to bottom construction back cover section, to form pressure measuring chamber; Again to after inserting in hole and injecting shutoff slurries, rear acquisition gas pressure value to be solidified.This method can avoid the water in country rock to enter into coal seam to be measured, improves the accuracy recording gas pressure value, reflects the gas pressure in coal seam more truly.
Description
Technical field
The present invention relates to coal mining field, particularly relate to a kind of gas pressure angle of depression measuring method and system.
Background technology
Coal-bed gas pressure is Gas and outstanding power, also judges the important indicator of coal gas content, and in roadway exposed coal process, Accurate Determining coal-bed gas pressure is key that is safe, efficient, rapid uncovering coal.
The measuring process of the gas pressure of prior art is as follows: step a, get out towards direction, place, coal seam on tunnel work plane or ground about 3m measured hole and in this circular hole, inject cement paste sealing of hole; Step b, after cement slurry sets, continue to creep in this measured hole, this measured hole is penetrated grout layer that in this circular hole, cement slurry sets is formed also extends to distance coal seam and is about 1m place, again in measured hole, injects cement paste; Step c, to be solidified after, again continue to creep in this measured hole, so that this measured hole is extended in coal seam, then, piezometer tube and Grouting Pipe are lowered in measured hole, and ensure that piezometer tube end is in coal seam, Grouting Pipe end is positioned at the top of piezometer tube end, shutoff in measured hole such as plugging material such as recycling polyurethane etc. forms back cover section, makes the end of Grouting Pipe be positioned at above back cover section, then forms pressure measuring chamber below the back cover section being arranged in coal seam; Steps d, again in measured hole, inject cement paste, after to be solidified, just obtain the gas pressure in coal seam by the pressure meter on piezometer tube top.
Gas pressure measuring method of the prior art is adopted to carry out coal-bed gas pressure measurement, relatively be applicable to the pressure measurement of hole, the elevation angle, when coal seam is positioned at the below on tunnel work plane or the ground, tunnel need boring measured hole, measured hole needs to extend, when namely measured hole is hole, the angle of depression along the direction of falling progressively downwards; Now, because the country rock around measured hole exists crack, and under enter in piezometer tube and Grouting Pipe process, measured hole is that the crack of water under gravity probably in country rock be directly communicated in coal seam, thus country rock flow in coal seam, occupy space, coal seam and cause gas pressure to change, thus obtain gas pressure value inaccurate, the real gas pressure in coal seam cannot be reflected.
Summary of the invention
For above-mentioned defect of the prior art, the invention provides a kind of gas pressure angle of depression measuring method and system, for avoiding the angle of depression to measure in gas pressure process, the water in country rock flow in coal seam, improves the accuracy of the gas pressure value recorded.
First aspect of the present invention is to provide a kind of gas pressure angle of depression measuring method, comprising:
Step one, around the position of measured hole to be drilled, get out at least three auxiliary injected holes extended towards coal seam to be measured, the polygonal center that described in the position of described measured hole to be drilled is positioned at, at least three auxiliary injected holes surround, and the bottom hole pitch of described auxiliary injected hole is from described coal seam first to be measured distance;
Step 2, inject shutoff slurries, to block described auxiliary injected hole respectively to described auxiliary injected hole;
Step 3, until described in after described shutoff slurries at least three auxiliary injected holes solidify completely, measured hole is got out in the position of described measured hole to be drilled, the bottom hole pitch of described measured hole from described coal seam to be measured second distance, and injects shutoff slurries in described measured hole;
Step 4, solidify to be formed completely until the shutoff slurries in described measured hole and measure behind block section, in described measured hole, penetrate described measurement block section and continue to creep into, with formed be connected with described coal seam to be measured insert hole;
Step 5, insert in hole the piezometer tube of inserting and measuring gas pressure for measuring described coal seam to be measured to described, and for injecting the Grouting Pipe of shutoff slurries, and insert hole close to bottom be positioned at back cover section of constructing above described coal seam to be measured, to form pressure measuring chamber described;
Step 6, again inject shutoff slurries to described inserting in hole by described Grouting Pipe, with after the first setting time, obtained the coal-bed gas pressure in described pressure measuring chamber by the pressure meter at described piezometer tube top.
Another aspect of the present invention is to provide a kind of gas pressure angle of depression measuring system, comprise: a measured hole and at least three the auxiliary injected holes be located at around described measured hole, the bottom hole pitch of described auxiliary injected hole is from described coal seam first to be measured distance, and the bottom hole pitch of described measured hole is from coal seam to be measured second distance; The seal section that shutoff grout cures is formed is filled with in described auxiliary injected hole; Be equipped with one in described measured hole and insert hole, described in insert hole and be connected with described coal seam to be measured, described in insert between hole and described measured hole as to measure block section; Described inserting in hole is provided with for measuring the piezometer tube of described coal-bed gas pressure to be measured and the Grouting Pipe for injecting shutoff slurries, and insert hole close to bottom be formed with back cover section described above described coal seam to be measured, described back cover section and the described bottom inserting hole surround pressure measuring chamber jointly, and described piezometer tube bottom is positioned at described pressure measuring chamber, described Grouting Pipe bottom is positioned at above described back cover section; The internal layer block section being filled with shutoff grout cures and being formed is inserted in hole described in above described back cover section.
Gas pressure angle of depression measuring method provided by the invention and system, by being arranged on the multiple auxiliary injected hole around measured hole, effectively can block the crack around measured hole to be drilled in country rock, outside water major part in country rock is intercepted at region that auxiliary injected hole surrounds, avoid water in country rock by measured hole and insert hole and enter into coal seam to be measured, thus improve the accuracy of the gas pressure value of acquisition, the gas pressure in coal seam can be reflected more truly, further ensure coal mine production safety.
Accompanying drawing explanation
Fig. 1 is the flow chart of the gas pressure angle of depression of the present invention measuring method embodiment;
Fig. 2 is the structural representation of the gas pressure angle of depression of the present invention measuring system embodiment;
Fig. 3 is A-A direction view in Fig. 2.
Detailed description of the invention
Fig. 1 is the flow chart of the gas pressure angle of depression of the present invention measuring method embodiment; As shown in Figure 1, the present embodiment provides a kind of gas pressure angle of depression measuring method, comprising:
Step 101, around the position of measured hole to be drilled, get out at least three auxiliary injected holes extended towards coal seam to be measured, the polygonal center that described in the position of described measured hole to be drilled is positioned at, at least three auxiliary injected holes surround, and the bottom hole pitch of described auxiliary injected hole is from coal seam first to be measured distance.
Particularly, measured hole can be selected to be drilled with on tunnel work plane or ground, and auxiliary grouting port can be selected to be drilled with on same tunnel work plane or bottom surface with measured hole; The sum of auxiliary injected hole can be more than three, and ensure the circumscribed circle home position of the auxiliary injected hole got out be measured hole be drilled with position; It should be noted that, the circumscribed circle diameter of above-mentioned auxiliary injected hole can be different according to the sum of auxiliary injected hole, when the circumscribed circle diameter of above-mentioned auxiliary injected hole is larger, the quantity of auxiliary injected hole should be more, when the circumscribed circle diameter of above-mentioned auxiliary injected hole is less, the quantity of auxiliary injected hole can be less.
Preferably, auxiliary injected hole can be 4, and the first distance can be less than or equal to 1m, and it is good that the polygonal circumscribed circle diameter that above-mentioned auxiliary injected hole surrounds is no more than 3m, can be 2 ~ 3m.
Preferably, the bottom hole pitch of described auxiliary injected hole can be less than or equal to described second distance from first distance in coal seam to be measured; The diameter of described auxiliary injected hole can be 94mm.。
Step 102, inject shutoff slurries, to block described auxiliary injected hole respectively to described auxiliary injected hole; Particularly, shutoff injection slurry can be cement paste, can certainly can fill space and the slurries that can solidify for other.
Step 103, until described in after described shutoff slurries at least three auxiliary injected holes solidify completely, measured hole is got out in the position of described measured hole to be drilled, the bottom hole pitch of described measured hole from described coal seam to be measured second distance, and injects shutoff slurries in described measured hole.
Particularly, second distance can be less than or equal to 1m; Here, after the shutoff slurries in three auxiliary injected holes solidify completely, again in the construction survey hole, regional center place that multiple auxiliary injected hole surrounds, crack in rock stratum in the region that more than three auxiliary injected holes can be made to surround is crammed by shutoff injection slurry, plays the effect that water in interception country rock flows to the measured hole place of hot work in progress.
Step 104, solidify to be formed completely until the shutoff slurries in described measured hole and measure behind block section, in described measured hole, penetrate described measurement block section and continue to creep into, with formed be connected with described coal seam to be measured insert hole; That is, after metering-orifice to be measured solidifies completely, more again penetrate this measured hole and continue to creep into until coal seam to be measured place, thus hole is inserted in formation.
Step 105, insert in hole the piezometer tube of inserting and measuring gas pressure for measuring described coal seam to be measured to described, and for injecting the Grouting Pipe of shutoff slurries, and insert hole close to bottom be positioned at back cover section of constructing above described coal seam to be measured, to form pressure measuring chamber described.
Particularly, piezometer tube end can reach in coal seam, and Grouting Pipe also extend into inserts hole but Grouting Pipe end should be in above coal seam; Then a baffle plate just can be utilized to be separated in coal seam and rock stratum inserting hole, and utilize polyurethane and rock wool above baffle plate by piezometer tube and insert to fill between the sidewall of hole and form back cover section, thus, hole of inserting below back cover section surrounds one and is in pressure measuring chamber in coal seam, piezometer tube end is then in this pressure measuring chamber, and the end of Grouting Pipe is then positioned at the top of back cover section.
Step 106, again inject shutoff slurries to described inserting in hole by described Grouting Pipe, with after the first setting time, obtained the coal-bed gas pressure in described pressure measuring chamber by the pressure meter at described piezometer tube top.
The gas pressure angle of depression measuring method that the present embodiment provides, injected hole is assisted by elder generation's construction around correspondence position before construction survey hole, and inject shutoff slurries to auxiliary injected hole, effectively block the crack in country rock around measured hole to be drilled, outside water major part in country rock is intercepted at region that auxiliary injected hole surrounds, avoid water in country rock by measured hole and insert hole and enter into coal seam to be measured, thus improve the accuracy of the gas pressure value of acquisition, the gas pressure in coal seam can be reflected more truly, further ensure coal mine production safety.
In the above-described embodiments, step 103 can also comprise: after the position of described measured hole to be drilled gets out measured hole, the sleeve pipe isometric with described measured hole is put in described measured hole, then in described measured hole, inject described shutoff slurries, and the internal diameter of described sleeve pipe be greater than described in insert the diameter in hole; After getting out measured hole, first in measured hole, insert the sleeve pipe that diameter is slightly less than measured hole, form one after can making shutoff grout cures better with measured hole sidewall, and sleeve pipe can also strengthen the plugging effect to measured hole, block flow direction median coal seam to be measured, rock stratum to a greater degree.
Wherein, preferably, the diameter of described measured hole can be 153mm or 133mm, and the diameter of described sleeve pipe is 108mm.
Fig. 2 is the structural representation of the gas pressure angle of depression of the present invention measuring system embodiment; Fig. 3 is A-A direction view in Fig. 2; Another embodiment of the present invention provides a kind of gas pressure angle of depression measuring system, as shown in Figures 2 and 3, comprise: a measured hole 21 and at least three the auxiliary injected holes 22 be located at around measured hole 21, the bottom hole pitch of auxiliary injected hole 22 is from coal seam 30 first to be measured distance, and the bottom hole pitch of measured hole 21 is from coal seam 30 to be measured second distance; The seal section that shutoff grout cures is formed is filled with in auxiliary injected hole 22; Be equipped with one in measured hole 21 and insert hole 211, insert hole 211 and be connected with coal seam 30 to be measured, insert between hole 211 and measured hole 21 as to measure block section 212; Insert in hole 211 and be provided with for measuring the piezometer tube 31 of coal seam 30 to be measured gas pressure and the Grouting Pipe 32 for injecting shutoff slurries, and above coal seam 30 to be measured, be formed with back cover section 33 inserting hole 211 close to bottom, back cover section 33 surrounds pressure measuring chamber 301 jointly with the bottom inserting hole 211, and piezometer tube 31 bottom is positioned at pressure measuring chamber 301, Grouting Pipe 32 bottom is positioned at above back cover section 33; Inserting in hole 211 above back cover section 33 is filled with the internal layer block section that shutoff grout cures is formed.
It should be noted that, do not represent in Fig. 3 measured hole 21 be level with the bearing of trend of inserting hole 211 and the bearing of trend in coal seam to be measured 30 also not represent be vertical, actual conditions are, measured hole 21 can extend in any direction with the bearing of trend of inserting hole 211 below horizontal plane, measured hole 21 then can perpendicular to coal seam 30 to be measured with the bearing of trend of inserting hole 211, to make to creep into apart from shorter, energy conservation.
Particularly, measured hole 21 and auxiliary injected hole 22 can be positioned on same tunnel work plane or ground, and the sum of auxiliary injected hole 22 can be more than three, and measured hole 21 is positioned at the circumscribed circle circle centre position of multiple auxiliary injected hole 22; It should be noted that, the circumscribed circle diameter of auxiliary injected hole 22 can be different according to the sum of auxiliary injected hole, when the circumscribed circle diameter of above-mentioned auxiliary injected hole is larger, accordingly, the quantity of auxiliary injected hole should be more, when the circumscribed circle diameter of above-mentioned auxiliary injected hole is less, the quantity of auxiliary injected hole can be corresponding less.
The gas pressure angle of depression measuring system of the present embodiment, piezometer tube 31 top can be connected a pressure meter, because pressure measuring chamber 301 is arranged in coal seam 30 to be measured, and be not mutually communicated with the rock stratum above it, therefore, gas pressure in the coal seam to be measured 3 that pressure in pressure measuring chamber 301 just reflects, that is, just can be obtained the gas pressure value in coal seam 30 to be measured by manometric reading.
Due in the gas pressure angle of depression measuring system that the present embodiment provides, multiple auxiliary injected hole 22 is provided with around measured hole 21, by the plugging action of auxiliary injected hole 22, the most of water in rock stratum can be made to be intercepted at auxiliary injected hole 22 to be surrounded outside region, avoid rock stratum Zhong Shui to flow into measured hole 21 and enter into coal seam to be measured after inserting hole 211, to eliminate in coal seam to be measured water to the impact of measured gas pressure value, make the pressure value obtained from piezometer tube can reflect gas pressure coal seam more realistically, improve measurement accuracy, be conducive to improving coal mine production safety.
In the above-described embodiments, also comprise: being located in measured hole 21 and being around in the sleeve pipe 213 of inserting outside hole 211, sleeve pipe 213 can be equal with measured hole 21 length.That is, after getting out measured hole 21, first can insert the sleeve pipe 213 that diameter is slightly less than measured hole in measured hole 21, one is formed with measured hole sidewall after making shutoff grout cures better, and sleeve pipe 213 can also strengthen the plugging effect to measured hole 21, block flow direction median coal seam to be measured, rock stratum to a greater degree.
Preferably, the bottom hole pitch of auxiliary injected hole 22 is less than or equal to the second distance of bottom hole pitch from coal seam 30 to be measured of measured hole 21 from first distance in coal seam to be measured, to tackle the flowing of the water in country rock more in all directions, is more conducive to anti-sealing and enters coal seam to be measured.
Further, auxiliary injected hole 22 can be four, and the first distance can be less than or equal to 1m, and the polygonal circumscribed circle diameter that four auxiliary injected holes 22 surround can be 2 ~ 3m.To facilitate the construction of auxiliary injected hole, and reach good interception water and flow to coal seam, obtain force value accurately.
Further, the diameter of auxiliary injected hole 22 can be 94mm, and the diameter of measured hole 21 can be 153mm or 133mm, and the diameter of sleeve pipe 213 can be 108mm; That is, auxiliary injected hole 22 can adopt diameter to be that the drill bit of 94mm is drilled to, and measured hole 21 can adopt diameter to be that the drill bit of 153mm or 133mm is drilled to, and the drill bit of these models be all common drill bit in shaft production, is conducive to raising utilization rate of equipment and installations; And the selection in above-mentioned aperture, be conducive to the process operations such as slip casting, lower pipe, be conducive to the efficiency improving gas pressure measurement.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a gas pressure angle of depression measuring method, is characterized in that, comprising:
Step one, around the position of measured hole to be drilled, get out at least three auxiliary injected holes extended towards coal seam to be measured, the polygonal center that described in the position of described measured hole to be drilled is positioned at, at least three auxiliary injected holes surround, and the bottom hole pitch of described auxiliary injected hole is from described coal seam first to be measured distance;
Step 2, inject shutoff slurries, to block described auxiliary injected hole respectively to described auxiliary injected hole;
Step 3, until described in after described shutoff slurries at least three auxiliary injected holes solidify completely, measured hole is got out in the position of described measured hole to be drilled, the bottom hole pitch of described measured hole is from described coal seam to be measured second distance, in described measured hole, put into the sleeve pipe isometric with described measured hole, and inject shutoff slurries in described measured hole;
Step 4, solidify to be formed completely until the shutoff slurries in described measured hole and measure behind block section, in described measured hole, penetrate described measurement block section and continue to creep into, with formed be connected with described coal seam to be measured insert hole, and described in insert hole and be positioned at described sleeve pipe;
Step 5, insert in hole the piezometer tube of inserting and measuring gas pressure for measuring described coal seam to be measured to described, and for injecting the Grouting Pipe of shutoff slurries, and insert hole close to bottom be positioned at back cover section of constructing above described coal seam to be measured, to form pressure measuring chamber described;
Step 6, again inject shutoff slurries to described inserting in hole by described Grouting Pipe, with after the first setting time, obtained the coal-bed gas pressure in described pressure measuring chamber by the pressure meter at described piezometer tube top.
2. the gas pressure angle of depression according to claim 1 measuring method, is characterized in that, described first distance is less than or equal to second distance.
3. the gas pressure angle of depression according to claim 1 measuring method, is characterized in that, described auxiliary injected hole is four, and described first distance is less than or equal to 1m, and the circumscribed circle diameter of shape changeable that described four auxiliary injected holes surround is 2 ~ 3m.
4., according to the arbitrary described gas pressure angle of depression measuring method of claims 1 to 3, it is characterized in that, the diameter of described auxiliary injected hole is 94mm, and the diameter of described measured hole is 153mm or 133mm, and the diameter of described sleeve pipe is 108mm.
5. a gas pressure angle of depression measuring system, is characterized in that, comprising:
One measured hole and at least three the auxiliary injected holes be located at around described measured hole, the bottom hole pitch of described auxiliary injected hole is from coal seam first to be measured distance, and the bottom hole pitch of described measured hole is from coal seam to be measured second distance; The seal section that shutoff grout cures is formed is filled with in described auxiliary injected hole; Be equipped with one in described measured hole and insert hole, described in insert hole and be connected with described coal seam to be measured, described in insert between hole and described measured hole as to measure block section; Described inserting in hole is provided with for measuring the piezometer tube of described coal-bed gas pressure to be measured and the Grouting Pipe for injecting shutoff slurries, and insert hole close to bottom be formed with back cover section described above described coal seam to be measured, described back cover section and the described bottom inserting hole surround pressure measuring chamber jointly, and described piezometer tube bottom is positioned at described pressure measuring chamber, described Grouting Pipe bottom is positioned at above described back cover section; The internal layer block section being filled with shutoff grout cures and being formed is inserted in hole described in above described back cover section;
Also comprise:
To be located in described measured hole and the sleeve pipe of inserting described in being around in outside hole, described sleeve pipe is equal with described measured hole length.
6. the gas pressure angle of depression according to claim 5 measuring system, is characterized in that, described first distance is less than or equal to second distance.
7. the gas pressure angle of depression according to claim 5 measuring system, is characterized in that, described auxiliary injected hole is four, and described first distance is less than or equal to 1m, and the polygonal circumscribed circle diameter that described four auxiliary injected holes surround is 2 ~ 3m.
8., according to the arbitrary described gas pressure angle of depression measuring system of claim 5 to 7, it is characterized in that, the diameter of described auxiliary injected hole is 94mm, and the diameter of described measured hole is 153mm or 133mm, and the diameter of described sleeve pipe is 108mm.
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| CN201210248480.4A CN102777169B (en) | 2012-07-18 | 2012-07-18 | Gas pressure angle of depression measuring method and system |
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| CN201210248480.4A CN102777169B (en) | 2012-07-18 | 2012-07-18 | Gas pressure angle of depression measuring method and system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104389587A (en) * | 2014-10-11 | 2015-03-04 | 安徽建筑大学 | Quick measurement method of coal seam gas pressure |
| CN113153273A (en) * | 2021-03-18 | 2021-07-23 | 华能煤炭技术研究有限公司 | Coal bed gas pressure measuring structure and measuring method |
| CN113464122A (en) * | 2021-06-23 | 2021-10-01 | 中国矿业大学 | Method for improving gas pressure determination accuracy through auxiliary drilling |
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