CN110630320B - Overburden rock isolation grouting filling position determination method based on drilling injection flow measurement - Google Patents
Overburden rock isolation grouting filling position determination method based on drilling injection flow measurement Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000002347 injection Methods 0.000 title claims abstract description 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 238000002955 isolation Methods 0.000 title claims abstract description 25
- 239000011435 rock Substances 0.000 title claims abstract description 14
- 238000005553 drilling Methods 0.000 title abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 26
- 230000002265 prevention Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005065 mining Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000005429 filling process Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
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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
- E21B49/00—Testing 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
A method for determining a overburden isolation grouting filling position based on injection flow measurement is suitable for coal mines. Selecting any grouting drill hole above a overburden rock isolation grouting filling coal face; in the process of water injection or grouting in a drilling hole, a flowmeter is lowered into a grouting drill rod at a constant speed through a wellhead blowout prevention pipe, and after the flowmeter is lowered into a bare hole, stop point measurement is carried out on different positions in the bare hole; taking out the flowmeter from the borehole after the measurement is finished; drawing the depth and the flow of the measuring points into a curve, and finding out all flow sudden-falling positions on the curve, namely the grouting filling layer position; when the coal face is pushed to different positions away from the grouting drill hole, the grouting filling position of the grouting drill hole can be determined for multiple times so as to monitor the dynamic change of the grouting drill hole. The method does not affect the normal grouting and subsidence control effects of the drill hole, and has the advantages of low cost, less time consumption, strong reliability, high accuracy, simple determination method and strong repeatability.
Description
Technical Field
The invention relates to a method for determining a overburden isolation grouting filling position, in particular to a method for determining the overburden isolation grouting filling position based on drilling injection flow measurement, which is particularly suitable for coal mining overburden isolation grouting filling mining building coal pressing.
Background
In recent years, the coal mine overlying strata isolation grouting filling technology plays a very positive role in underground coal mining of buildings (structures), ensures the normal mining replacement and service life of coal mine enterprises (especially aging mines), protects the safety of the buildings, and becomes an important technical means for underground coal mining of the buildings. The technology relates to the construction of a plurality of groups of grouting drill holes which are vertical to the direction of a coal seam from the ground surface above a coal face, and high-pressure grouting filling is carried out on a overburden separated zone formed by mining by using the drill holes in the stoping process, so that deformation of an overburden stratum is limited, and ground surface subsidence is effectively controlled.
In the application of the overlying strata isolation grouting filling technology, the overlying strata grouting filling position for determining the position of a drill hole is the basis of injection-production ratio design and surface subsidence control effect evaluation, and the grouting filling position not only determines the grouting amount and the required grouting pressure, but also influences the surface subsidence control effect. Therefore, it is necessary to establish a method for determining the overburden grouting filling level.
Aiming at the problem of determining the overlying strata grouting filling position, the prior art has a method for specially constructing and checking a drill hole after the grouting filling is finished, and the filling position is determined according to a taken filling body through the whole coring process during the drilling. The prior art also discloses a method for determining a grouting filling position in a grouting process, and patent ZL201510032975.7 discloses a method for detecting a overburden rock isolation grouting filling position, which comprises the steps of selecting two adjacent drill holes as an auxiliary grouting drill hole and a detection grouting drill hole respectively, determining grout discharge flow rates at different depths through a combined structure formed by a drill rod, a bound water pipe, a bound rubber plug and the like in the auxiliary grouting drill hole when the auxiliary grouting drill hole is communicated with the detection grouting drill hole, thereby determining the grouting filling position of the detection drill hole, wherein although the method avoids the independent construction of the detection drill hole, the position detection in the grouting process can be realized, the method can only measure when the grouting positions of 2 holes are communicated, the grouting position of the detection grouting drill hole cannot be directly detected, and the method cannot be used after the detection grouting drill hole is injected, in addition, the method needs to put a drill rod in the auxiliary measurement grouting drilling measurement process, so that the engineering quantity is large and the implementation difficulty is large.
Disclosure of Invention
The technical problem is as follows: aiming at the defects of the technology, the overlying strata grouting filling position determining method based on injection flow measurement is low in cost, less in time consumption, strong in reliability, high in accuracy and simple in determining method.
The technical scheme is as follows: in order to achieve the technical purpose, the method for determining the overburden isolation grouting filling position based on injection flow measurement comprises the following steps:
selecting any grouting drill hole vertically drilled from the earth surface as a drill hole of a grouting filling layer to be determined on a overburden rock isolation grouting filling coal mining working face;
and b, implementing grouting filling arrangement on the grouting drill hole, wherein the grouting drill hole comprises a casing section and a bare hole section, and a grouting drill rod is installed in the casing section.
c, in the grouting filling process of the grouting drill hole (9), a blowout prevention pipe is connected to the wellhead device, an underground flowmeter cable with a flowmeter arranged at the top end is lowered into the grouting drill hole at a constant speed through the wellhead blowout prevention pipe by means of a grouting drill rod by using a ground winch, the time below the flowmeter in the lowering process, the lowering depth of the flowmeter and the flow value of the bare hole section are synchronously recorded until the measurement of the bottom of the bare hole is completed, and the flow value of the grouting drill rod section does not need to be measured;
d, after the flow measurement of different measurement positions in the bare hole section is finished, the flowmeter is lifted out of the grouting drill hole;
e, arranging data measured by the flowmeter in the bare hole section according to time, arranging depth values of all measurement stop points in the bare hole section and flow values correspondingly, drawing a curve graph by taking the flow values as a horizontal axis and the depth values as a vertical axis, selecting measurement points in the curve graph at fixed depth intervals or fixed time intervals, and comparing the flow values of two adjacent measurement points; and comparing flow values from the upper part depth to the lower part depth of the bare hole section, judging that a grouting filling layer exists between the two measuring points when the flow value of the measuring point at the next depth is smaller than that of the measuring point at the previous depth, judging the position of the injection layer by combining rock stratum lithology comparison, and determining all grouting filling layers in the grouting drill hole by analogy until the difference between the flow values of the two measuring points is the actual injection flow of the grouting layer.
The diameter of the grouting drill rod is larger than that of the flowmeter.
When the flowmeter is lowered into the bare hole section through the grouting drill rod section, stop point measurement is carried out on different measurement depths in the bare hole section of the grouting drill hole, the stop point measurement is that the flowmeter is suspended at a measurement position until the flow value read by the flowmeter is stable without lowering the flowmeter, and the stable flow value is the flow value of the measurement stop point.
The different measurement positions of the bare hole section are positions which are hovered and measured once every other fixed distance from the top of the bare hole, or positions near the determined grouting depth in advance.
The fixed distance is 3-5 m.
The flowmeter is an electromagnetic flowmeter, an ultrasonic flowmeter or a turbine flowmeter suitable for injecting media into a drill hole, and can be a storage type or a ground direct-reading type; the flowmeter is used for real-time sampling, and the sampling interval is set according to the requirement.
The hover time is the time for which the flow meter used is able to measure stable data, typically 5-8 min.
The grouting position may change due to changes of grouting conditions and mining conditions, and multiple measurements are performed when the coal face advances to different positions from the grouting drill hole to determine the grouting filling position, so that dynamic changes of the grouting filling position are monitored, changes of the grouting position are obtained in time, and grouting pressure parameters are adjusted according to the changes.
The method can be used for measuring for multiple times when the coal face is mined to different positions away from a grouting drill hole, and can be used for measuring in the grouting process of the grouting drill hole or the water injection process, so that the normal implementation of grouting is not influenced.
When the storage type flow meter is adopted, after the flow data of all the measuring points are recovered and read after the flowmeter is detected, comparison is carried out so as to judge the position of the grouting filling layer, and when the ground direct-reading type flowmeter is adopted, the flow data of the two measuring points are compared in real time after the flow data of the second measuring point is obtained, so that the position of the grouting filling layer is judged.
Has the advantages that:
the method has the advantages that the overburden rock is damaged in the coal mining process, so that the overburden rock is greatly deformed, separation layers occurring along with the mining process are dynamically changed, the position of a grouting filling layer is not completely determined and can change along with the mining process, and the position of the loss occurring in the overburden rock is found out in real time through detection of a flowmeter, so that the specific position of the grouting filling layer is determined, and the adjustment of grouting parameters is guided;
the method does not influence the normal implementation of grouting filling, ensures the uninterrupted implementation and the surface subsidence control effect of the grouting filling, makes up the defect that the traditional grouting filling position determining method cannot determine the grouting position when the drilling and grouting filling are carried out, and can truly and effectively reflect the change of the grouting filling position; special detection drilling is not required to be constructed, only the existing grouting drilling is required, and the detection cost is reduced;
in addition, in the grouting filling process, when the working face is away from different positions of a grouting drill hole, the grouting position can be determined, and the dynamic change process of the grouting position is mastered according to the determined grouting filling position, so that the grouting filling process and parameter control are guided, the surface subsidence control effect of the grouting filling engineering is improved, the coal pressing problem of 'three times' is better solved, and the safety of a ground building is effectively protected.
Drawings
FIG. 1 is a schematic view of a test grouting borehole plan arrangement for determining a grouting fill level of the present invention;
FIG. 2 is a schematic cross-sectional view of a method for determining a grouting filling level according to the present invention;
FIG. 3 is a graph of depth versus flow measured in accordance with the present invention.
In the figure: 1-downhole flow meter cable; 2-the earth's surface; 3-slurry flow direction; 4-grouting a drill rod; 5-a first layer of grouting filling layer; 6-a flow meter; 7-a bare hole section; 8-coal face; 9-grouting and drilling; 10-grouting the top of the drill rod.
Detailed Description
The invention is further described with reference to the accompanying drawings in which:
as shown in fig. 1 and 2, the method for determining the overburden isolation grouting filling horizon based on borehole injection flow measurement comprises the following steps:
a, selecting any grouting drill hole 9 vertically drilled from the earth surface 2 on a overburden rock isolation grouting filling coal face 8 as a drill hole of a grouting filling layer position to be determined;
b, implementing grouting filling arrangement on the grouting drill hole 9, wherein the grouting drill hole is composed of a casing section and a bare hole section 7, and a grouting drill rod 4 is installed in the casing section;
c, in the grouting filling process of the grouting drill hole 9, a blowout prevention pipe is connected to a wellhead device, the flowing direction 3 of slurry is shown in the figure, an underground flowmeter cable 1 with a flowmeter 6 arranged at the top end is placed into the grouting drill hole 9 through a wellhead blowout prevention pipe at a constant speed by means of a grouting drill rod 4 by utilizing a ground winch, the time below the flowmeter 6, the lowering depth of the flowmeter 6 and the flow value of the bare hole section 7 in the lowering process are synchronously recorded until the measurement of the bottom of the bare hole is completed, and the flow value of the grouting drill rod section does not need to be measured; the diameter of the grouting drill rod 4 is larger than that of the flowmeter 6; the flowmeter 6 is an electromagnetic flowmeter, an ultrasonic flowmeter or a turbine flowmeter 6 which is suitable for injecting media into a borehole, and can be of a storage type or a ground direct-reading type; the flowmeter 6 is used for real-time sampling, and the sampling interval is set as required;
d, after the flow measurement of different measurement positions in the bare hole section 7 is finished, the flowmeter 6 is lifted out of the grouting drill hole 9;
e, arranging data measured by the flowmeter 6 in the bare hole section 7 according to time, arranging depth values of all measurement stop points in the bare hole section 7 and flow values correspondingly, drawing a curve graph by taking the flow values as a horizontal axis and the depth values as a vertical axis, selecting measurement points in the curve graph at fixed depth intervals or fixed time intervals, and comparing the flow values of two adjacent measurement points; comparing flow values from the upper part depth to the lower part depth of the bare hole section 7, judging that a grouting filling layer exists between the two measuring points when the flow value of the measuring point at the next depth is smaller than that of the measuring point at the previous depth, judging the position of the injection layer by combining rock stratum lithology comparison, and repeating the steps until the bottom of a grouting drill hole 9 is compared to finish the determination of all grouting filling layers in the grouting drill hole 9, wherein the difference between the flow values of the two measuring points is the actual injection flow of the grouting layer;
when the flowmeter 6 is lowered into the bare hole section 7 through the grouting drill rod section, stopping point measurement is carried out on different measurement depths in the bare hole section 7 of the grouting drill hole 9, the stopping point measurement is that the flowmeter 6 is suspended at a measurement position without lowering the flowmeter until a flow value read by the flowmeter 6 is stable, the stable flow value is the flow value of the measurement stopping point, the different measurement positions of the bare hole section 7 are positions where measurement is suspended once every other fixed distance from the top of the bare hole, and the fixed distance is 3-5 m; or a position near the determined grouting depth in advance.
The hover time is the time for which the flow meter 6 used is able to measure stable data, typically 5-8 min.
The grouting position may change due to changes of grouting conditions and mining conditions, and multiple measurements are performed when the coal face 8 advances to different positions from the grouting borehole 9 to determine the grouting filling position, so that dynamic changes of the grouting filling position are monitored, changes of the grouting position are obtained in time, and parameters such as grouting pressure are adjusted according to the changes.
The method can be used for measuring for many times when the coal face 8 is mined to different positions away from the grouting drill hole 9, and can be used for measuring in the grouting or water injection process of the grouting drill hole 9, so that the normal implementation of grouting is not influenced.
When the storage type flow meter is adopted, the flow meter 6 needs to be recovered to the earth surface 2 after detection is finished, and the flow data of all the measuring points are read, and then comparison is carried out so as to judge the position of the grouting filling layer, and when the ground direct-reading type flow meter is adopted, the flow data of the two measuring points are compared in real time after the flow data of the second measuring point is obtained, so that the position of the grouting filling layer is judged.
The first embodiment is as follows:
1) randomly selecting one grouting drill hole 9 in the mining working face as a grouting filling position to determine a grouting drill hole;
2) in the mining process of the coal face 8 and before grouting of the grouting drill hole 9, a blowout preventer is connected to the wellhead of the grouting drill hole 9; injecting water into the grouting drill hole 9 at a stable flow rate; a ground winch is used for lowering the underground flowmeter 6 into the grouting drill rod 4 from the top 10 of the grouting drill rod at a constant speed through a blowout prevention pipe through a cable 1;
3) when the downhole flowmeter 6 is lowered to the top of the open hole section 7, the first fixed-point measurement is started; the measurement adopts a hovering continuous acquisition mode, namely the underground flowmeter 6 is maintained at a certain depth, the underground flowmeter 6 automatically stores time, depth and corresponding flow values, and direct-reading flow timing is adopted; displaying the information in real time and automatically drawing the image through a ground system; hovering and detecting once every 3m from the top of the bare hole section 7 to the bottom of the bare hole section 7, wherein the hovering time is 5 minutes; the hovering depth interval value and the hovering time can be reduced or increased according to the requirement;
4) when the flowmeter 6 is lowered to the bottom of the open hole 7, the downhole flowmeter 6 starts to be lifted up to the ground surface 2, and the measurement is finished;
5) determining a grouting filling position: as shown in fig. 3, h1-h10 are the numbers of the measuring points, the flow of each measuring point is taken as the horizontal axis and the depth is taken as the vertical axis, the depth and the flow of each measuring point are drawn into a curve, and the sudden drop position of the flow is searched according to the curve; searching a flow curve from top to bottom, wherein when two adjacent measuring points h3 and h4 on the curve have sudden flow reduction, a first layer of grouting filling layer 5 exists between the two measuring points, the depth of the first layer of grouting filling layer is between two measuring points h 3-h 4, and the distance between the measuring points is only 3m and is smaller than the thickness of a general coal series rock stratum, so that the positioning depth meets the engineering requirement;
and sequentially searching all flow sudden-falling positions in the remaining curve segments to determine all grouting filling positions. In the figure, when the numerical values of a measuring point h7 and a measuring point h8 are compared, the situation that the flow rate suddenly drops occurs again, and a second layer grouting filling layer exists between the measuring points h 7-h 8;
6) when the coal face 8 is pushed to different positions away from the drill hole and the drill hole is grouted and filled, the same grouted drill hole is tested for multiple times to determine a grouting filling position so as to monitor the dynamic change of the grouting filling position; normal grouting of a grouting drill hole is not affected in the testing process.
Claims (10)
1. A method for determining a overburden rock isolation grouting filling position based on measurement of borehole injection flow is characterized by comprising the following steps:
a, selecting any grouting drill hole (9) vertically drilled from the earth surface (2) on a overburden isolation grouting filling coal mining working face (8) as a drill hole of a grouting filling layer position to be determined;
b, implementing grouting filling arrangement on the grouting drill hole (9), wherein the grouting drill hole (9) comprises a casing section and a bare hole section, and a grouting drill rod is installed in the casing section;
c, in the grouting filling process of the grouting drill hole (9), a blowout prevention pipe is connected to a wellhead device, an underground flowmeter cable (1) with a flowmeter (6) arranged at the top end is lowered into the grouting drill hole (9) at a constant speed through the wellhead blowout prevention pipe by means of a grouting drill rod (4) by using a ground winch, the time below the flowmeter (6), the lowering depth of the flowmeter (6) and the flow value of the bare hole section (7) in the lowering process are synchronously recorded until the measurement of the bottom of the bare hole is completed, and the flow value of the grouting drill rod section does not need to be measured;
d, after the flow measurement of different measurement positions in the bare hole section (7) is finished, the flowmeter (6) is lifted out of the grouting drill hole (9);
e, arranging data measured by the flowmeter (6) in the bare hole section (7) according to time, correspondingly arranging the depth value of each measurement stop point in the bare hole section (7) and the flow value, drawing a curve graph by taking the flow value as a horizontal axis and the depth value as a vertical axis, selecting a measurement point in the curve graph at a fixed depth interval or a fixed time interval, and comparing the flow values of two adjacent measurement points; and comparing flow values from the upper depth to the lower depth of the bare hole section (7), judging that a grouting filling layer exists between the two measuring points when the flow value of the measuring point at the next depth is smaller than that of the measuring point at the previous depth, judging the grouting filling layer by combining rock stratum lithology comparison, determining the actual injection flow of the grouting filling layer by the difference of the flow values of the two measuring points, and repeating the steps until the bottom of the grouting drill hole (9) is compared, thereby finishing the determination of all grouting filling layers in the grouting drill hole (9).
2. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 1, wherein: the diameter of the grouting drill rod (4) is larger than that of the flowmeter (6).
3. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 1, wherein: when the flowmeter (6) is lowered into the bare hole section (7) through the grouting drill rod section, stop point measurement is carried out on different measurement depths in the bare hole section (7) of the grouting drill hole (9), the stop point measurement is that the flowmeter (6) is suspended at a measurement position until the flow value read by the flowmeter (6) is stable without lowering the flowmeter, and the stable flow value is the flow value of the measurement stop point.
4. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 3, wherein: different measurement positions of the bare hole section (7) are positions which are hovered and measured once every other fixed distance from the top of the bare hole, or positions near the grouting depth which are judged in advance.
5. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 4, wherein: the fixed distance is 3-5 m.
6. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 1, wherein: the flowmeter (6) is an electromagnetic flowmeter, an ultrasonic flowmeter or a turbine flowmeter (6) suitable for injecting media into a drill hole, and is of a storage type or a ground direct-reading type; the flowmeter (6) is used for real-time sampling, and the sampling interval is set according to the requirement.
7. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 3 or 6, wherein: the flow meter (6) can measure the hovering time of stable data for 5-8 min.
8. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 1, wherein: the grouting filling position is probably changed due to the change of the grouting working condition and the mining condition, and the grouting filling position is determined by measuring for many times when the coal face (8) is pushed to different positions away from the grouting drill hole (9), so that the dynamic change of the grouting filling position is monitored, the change condition of the grouting filling position is timely obtained, and the grouting pressure parameter is adjusted according to the change condition.
9. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 3, wherein: the coal face (8) is mined to different positions away from the grouting drill hole (9) for multiple measurements, and the measurements are carried out in the grouting or water injection process of the grouting drill hole (9), so that the normal implementation of grouting is not influenced.
10. The overburden isolation grouting filling level determination method based on borehole injection flow measurement according to claim 3 or 6, wherein: when the storage type flow meter is adopted, the flow meter (6) needs to be recovered to the earth surface (2) after detection is finished and flow data of all measuring points are read, comparison is carried out so as to judge the position of the grouting filling layer position, and when the ground direct-reading type flow meter is adopted, the flow data of the two measuring points are compared in real time after the flow data of the second measuring point is obtained, so that the position of the grouting filling layer position is judged.
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| CN102704933B (en) * | 2012-05-25 | 2014-10-29 | 中国矿业大学 | Isolated-section grouting filling coal-mining method for mining overburden rock |
| CN104747231B (en) * | 2015-01-22 | 2016-12-07 | 中国矿业大学 | A kind of overlying strata isolation grouting filling layer position detection method |
| CN105257334B (en) * | 2015-09-30 | 2017-05-10 | 中国矿业大学 | Surface drilling pressure relief gas extraction and overlying strata isolated grouting filling synchronous implementing method |
| CN105298538B (en) * | 2015-09-30 | 2017-06-06 | 淮北矿业（集团）有限责任公司 | The dual-purpose method in a hole of grouting filling is realized using ground gas extraction borehole |
| CN106761392A (en) * | 2016-12-20 | 2017-05-31 | 淮北矿业（集团）勘探工程有限责任公司 | It is a kind of for the hole structure with grouting filling in hyperbaric environment |
| CN108999634B (en) * | 2018-07-26 | 2019-07-05 | 中国矿业大学 | Surface drilling realizes that a hole of water damage prevention and treatment and surface settlement control is mostly used method |
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