CN112378769A - Hydraulic pre-fracturing parameter determination method - Google Patents
Hydraulic pre-fracturing parameter determination method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000523 sample Substances 0.000 claims abstract description 48
- 239000011435 rock Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 238000005065 mining Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000004080 punching Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000013467 fragmentation Methods 0.000 claims 1
- 238000006062 fragmentation reaction Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract description 11
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004836 empirical method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention provides a method for determining hydraulic pre-cracking parameters, which comprises the following steps: arranging a plurality of cross pile distribution points on a return airway and a transportation airway of the fully mechanized mining face; arranging an acoustic emission probe and a hydraulic pre-splitting drill hole between every two adjacent cross-shaped pile arrangement points; performing water injection pre-splitting on the hydraulic pre-splitting drill hole, and adjusting parameters of the hydraulic pre-splitting drill hole in the water injection process; in the process of adjusting the hydraulic pressure pre-fracturing drilling parameters, recording the corresponding roadway deformation, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time under different hydraulic pressure pre-fracturing parameters; and determining the hydraulic pre-fracturing parameters which enable the hydraulic pre-fracturing effect to meet the requirements according to the deformation of the roadway, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time. The method for the hydraulic pre-splitting of the fully mechanized coal mining face has the advantages that the deformation of the roadway at the front position of the fully mechanized coal mining face is minimum, the crushing degree of the interior of the rock of the roadway roof is maximum, the caving degree of the goaf is most compact, the caving time is shortest, and the hydraulic pre-splitting effect is optimal.
Description
Technical Field
The invention relates to the technical field of mining engineering, in particular to a method for determining hydraulic pre-fracturing parameters.
Background
In the stoping process of the fully mechanized coal mining face of the coal mine, due to insufficient caving of the goaf, the pressure of an overlying strata, which is supposed to be borne by caving gangue of the goaf, is transferred to the front of a coal wall of the face, a pressure rising area is formed at the front section of a return airway and a transportation airway of the face, and the pressure borne by the roadway of the area is far larger than the stress of the original rock. When the pressure exceeds the maximum bearing capacity of the roadway, the roadway is deformed in the forms of sinking of a roadway top plate, bottom bulging, wall bulging and the like. The tunnel deformation is larger in the soft rock tunnel. The result can directly lead to the fact that the roadway support of the working face cannot be pulled forwards, the belt support of the conveying roadway is overturned, the ventilation section is rapidly reduced, the safety distance of pedestrians is seriously insufficient, and the fully mechanized mining working face is directly stopped. In addition, because the caving of the goaf is insufficient, when the suspended ceiling area of the goaf is too large and reaches a certain degree, the hydraulic support can be turned over by the blast generated after the top plate of the goaf falls, and the casualty accident of the working face is caused.
In order to reduce the deformation of the roadway, improve the caving degree of the top plate of the goaf, ensure the timely caving of the top plate of the goaf, ensure the smooth forward pulling and moving of the roadway support of the fully mechanized coal mining face, normally transport coal by a conveyor roadway belt and ensure ventilation and pedestrians. The method adopted at present is to carry out hydraulic pressure pre-splitting drilling at shoulder pits of a return airway and a transportation roadway in advance, and then to cut a roadway top plate in advance by injecting high-pressure water. Finally, the purposes of fully caving the goaf and reducing the deformation of the roadway at the leading part of the working face are achieved.
At present, the selection of the hydraulic pre-cracking parameters generally adopts an empirical mode, but because the geological conditions of different coal mines are different, the geological conditions of different coal beds of the same coal mine are also different, and the selection of the hydraulic pre-cracking parameters by a simple empirical method is not accurate.
Disclosure of Invention
In view of the above, the invention provides a method for determining hydraulic pre-fracturing parameters, which solves the technical problem that the selection of the hydraulic pre-fracturing parameters through manual experience values is inaccurate in the prior art.
The invention provides a method for determining hydraulic pre-cracking parameters, which comprises the following steps:
arranging a plurality of cross pile distribution points on a return airway and a transportation lane of the fully mechanized mining face, wherein the distance between two adjacent cross pile distribution points is a set distance L;
arranging an acoustic emission probe and a hydraulic pre-splitting drill hole between every two adjacent cross pile laying points, wherein the distance between every two adjacent acoustic emission probes is a set distance LS, and the distance between every two adjacent hydraulic pre-splitting drill holes is a set distance LT;
performing water injection pre-splitting on the hydraulic pre-splitting drill hole, and adjusting parameters of the hydraulic pre-splitting drill hole in the water injection process;
in the process of adjusting the hydraulic pressure pre-fracturing drilling parameters, recording the corresponding roadway deformation, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time under different hydraulic pressure pre-fracturing parameters;
and determining the hydraulic pre-fracturing parameters which enable the hydraulic pre-fracturing effect to meet the requirements according to the deformation of the roadway, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time.
Optionally, in the method for determining hydraulic pre-fracturing parameters, the roadway deformation is obtained by:
and monitoring the distance between the upper wall of the roadway and the central line of the roadway, the distance between the lower wall of the roadway and the central line of the roadway and the distance between the middle roof and the bottom plate of the roadway to obtain the deformation of the roadway.
Optionally, in the method for determining hydraulic pre-fracturing parameters, the roadway deformation corresponding to the hydraulic pre-fracturing parameters is obtained by:
and acquiring a detection result of the acoustic emission probe in real time, and determining the distance between the acoustic emission probe and the boundary of the roadway according to the signal emission time, the signal receiving time and the signal wavelength of the acoustic emission probe so as to determine the deformation of the roadway.
Optionally, in the hydraulic pre-fracturing parameter determining method, the rock breaking degree inside the roadway roof is obtained by:
and acquiring a detection result of the acoustic emission probe in real time, acquiring a rock fracture inside the roadway roof according to the detection result, and acquiring the rock crushing degree inside the roadway roof according to the rock fracture.
Optionally, in the method for determining hydraulic pre-fracturing parameters, the distance between two adjacent cross-shaped pile laying points, the distance between two adjacent acoustic emission probes, and the distance between two adjacent hydraulic pre-fracturing drill holes are the same.
Optionally, in the method for determining hydraulic pre-fracturing parameters, the hydraulic pre-fracturing parameters include, but are not limited to, a bore diameter, a bore depth, an angle, a bore position, and a water injection timing.
Optionally, in the method for determining a hydraulic pre-fracturing parameter, the acoustic emission probe is set as follows:
and punching a hole at the position where the acoustic emission probe is arranged, and sealing the hole opening after the acoustic emission probe is arranged at the set depth inside the hole.
Optionally, in the method for determining hydraulic pre-splitting parameters, the set depth is the same as the distance between two adjacent cross-shaped pile laying points, the distance between two adjacent acoustic emission probes, and the distance between two adjacent hydraulic pre-splitting drill holes.
Optionally, in the method for determining hydraulic pre-splitting parameters, the distance between the set depth and the two adjacent cross pile arrangement points, the distance between the two adjacent acoustic emission probes, and the distance between the two adjacent hydraulic pre-splitting drill holes are 10 ± 1 meter.
Optionally, in the method for determining hydraulic pre-splitting parameters, in the step of arranging the acoustic emission probe between every two adjacent cross-shaped pile arrangement points and the hydraulic pre-splitting drill hole, the maximum depth of the hydraulic pre-splitting drill hole is the same as the distance between every two adjacent cross-shaped pile arrangement points, the distance between every two adjacent acoustic emission probes, and the distance between every two adjacent hydraulic pre-splitting drill holes.
Compared with the prior art, the technical scheme provided by the invention at least has the following beneficial effects: the method is characterized in that the correlations of different hydraulic pre-fracturing parameters, the deformation of the roadway, the rock crushing degree of the interior of the roof of the roadway, the caving degree of the goaf and the caving time are researched by taking the deformation of the roadway, the rock crushing degree of the interior of the roof of the roadway, the caving degree of the goaf and the caving time as evaluation indexes in a mode of combining cross pile arrangement, monitoring by an acoustic emission probe and field observation. By taking the four indexes as the basis and continuously adjusting the parameters of the aperture, the hole depth, the angle, the drilling position and the water injection time of the hydraulic pre-fracturing drill hole, the method which can ensure that the deformation of the roadway at the advanced position of the fully mechanized mining face is minimum, the internal crushing degree of the roadway roof rock is highest, the caving degree of the goaf is most compact and the caving time is shortest and the hydraulic pre-fracturing effect is optimal is obtained.
Drawings
Fig. 1 is a flow chart of a construction process of a hydraulic pre-fracturing parameter determination method according to an embodiment of the invention;
FIG. 2 is a plan view of a cross-shaped pile arrangement according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a cross-shaped pile arrangement according to an embodiment of the present invention;
FIG. 4 is a diagram of an acoustic emission probe and a hydraulic pre-frac borehole floor plan according to one embodiment of the present invention;
FIG. 5 is a cross-sectional view of an acoustic emission probe and hydraulic pre-fracturing arrangement in a return airway, in accordance with an embodiment of the present invention;
FIG. 6 is a cross-sectional view of an acoustic emission probe and hydraulic pre-fracturing arrangement in a roadway, in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a method for optimizing hydraulic pre-fracturing in accordance with an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Some embodiments of the present application provide a method for determining hydraulic pre-fracturing parameters, as shown in fig. 1, including the following steps:
the method comprises the following steps: a plurality of cross pile distribution points are arranged on the air return roadway and the transportation roadway of the fully mechanized mining face, and the distance between every two adjacent cross pile distribution points is a set distance L.
Step two: an acoustic emission probe and a hydraulic pre-splitting drill hole are arranged between every two adjacent cross-shaped pile laying points, wherein the distance between every two adjacent acoustic emission probes is a set distance LS, and the distance between every two adjacent hydraulic pre-splitting drill holes is a set distance LT.
Step three: and (4) performing water injection pre-fracturing on the hydraulic pre-fracturing drill hole, and adjusting the parameters of the hydraulic pre-fracturing drill hole in the water injection process.
Step four: in the process of adjusting the hydraulic pressure pre-fracturing drilling parameters, the corresponding roadway deformation, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time under different hydraulic pressure pre-fracturing parameters are recorded.
Step five: and determining the hydraulic pre-fracturing parameters which enable the hydraulic pre-fracturing effect to meet the requirements according to the deformation of the roadway, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time.
Specifically, referring to fig. 2, cross-shaped pile distribution points 101 are arranged at intervals of a set distance L between a return air lane and a transportation lane of the fully mechanized mining face, the pile distribution points are the cross-shaped pile distribution points shown in fig. 3, wherein L is preferably 10m, and the arrangement range is from the coal wall of the working face to a roadway opening. As shown in fig. 3, the distance L1 between the upper wall of the roadway and the central line of the roadway, the distance L2 between the lower wall of the roadway and the central line of the roadway, and the distance L3 between the roof and the bottom plate in the roadway are monitored and recorded. Then, as shown in fig. 4-6, a group of hydraulic pre-splitting drill holes 102 and a group of acoustic emission probes 103 are arranged on each roadway section at the middle position of every two cross pile arrangement points with L as an interval, each group of probes and hydraulic pre-splitting holes drill holes at shoulder pits (the return airway is an upper shoulder pit, and the transportation lane is a lower shoulder pit) of the roadway section, then the acoustic emission probes are plugged into the acoustic emission drill holes and sealed, and the hydraulic pre-splitting drill holes are subjected to water injection pre-splitting.
As shown in fig. 5 and fig. 6, the drilling depth LS of the acoustic emission probe can be selected to be 10m (the drilling depth can be adjusted according to actual conditions), and the hydraulic pre-fracturing drilling depth LT can also be selected to be 10m (the drilling depth can be adjusted according to actual conditions). And continuously adjusting parameters of the hydraulic pre-fracturing drill, such as the aperture, the hole depth, the angle, the drilling position and the water injection time of the hydraulic pre-fracturing drill in a water injection pressure relief process, monitoring and recording roadway deformation and the rock crushing degree inside a roadway roof corresponding to different hydraulic pre-fracturing parameters in real time by using an acoustic emission probe, and finally calculating and analyzing the collected data according to an acoustic emission signal, the caving degree of a goaf and the caving time to find out the hydraulic pre-fracturing parameter which enables the hydraulic pre-fracturing effect to reach the best.
In the scheme, the acoustic emission probe, the cross-shaped pile arrangement of the roadway and the field observation are used as means to calculate and analyze different hydraulic pre-fracturing parameters, such as the aperture, the depth and the angle of a hydraulic pre-fracturing drill hole, the position of the drill hole, an acoustic emission signal at the time of water injection, the deformation of the roadway, the caving degree of a goaf and the caving time, and finally a group of hydraulic pre-fracturing parameters which enable the hydraulic pre-fracturing effect to reach the best are found. The roadway deformation amount can be obtained by monitoring the distance between the upper wall of the roadway and the central line of the roadway, the distance between the lower wall of the roadway and the central line of the roadway and the distance between the top and the bottom plate in the roadway. The detection result of the acoustic emission probe can be obtained in real time, the distance between the acoustic emission probe and the roadway boundary is determined according to the signal emission time, the signal receiving time and the signal wavelength of the acoustic emission probe, and further the roadway deformation is determined. Further, the rock crushing degree inside the roadway roof is obtained through the following method: and acquiring a detection result of the acoustic emission probe in real time, acquiring a rock fracture inside the roadway roof according to the detection result, and acquiring the rock crushing degree inside the roadway roof according to the rock fracture. As shown in the figure, can set up sound receiving probe 104 in the tunnel, the transmission of the sound wave signal of acoustic emission probe transmission has the decay of certain degree in the tunnel country rock, can determine whether there is the crack or country rock thickness in the country rock according to the decay degree to determine tunnel deformation volume and rock crushing degree. And the detection of the caving degree and the caving time of the goaf can be realized by adopting a mature field detection mode in the prior art.
In order to facilitate construction, the maximum depth value of the hydraulic pre-splitting drill hole in the scheme is the same as the distance between two adjacent cross pile arrangement points, the distance between two adjacent acoustic emission probes and the distance between two adjacent hydraulic pre-splitting drill holes, and the maximum depth value can be 10 meters.
When the optimal presplitting parameters are selected, the schematic diagram is shown in fig. 7:
step 2.1: adjusting hydraulic pre-cracking parameters, the pore diameter, the pore depth, the angle, the drilling position, the water injection time and the like of a hydraulic pre-cracking drill hole in the hydraulic pre-cracking process;
step 2.2: monitoring an acoustic emission signal inside the surrounding rock by using an acoustic emission monitoring device;
step 2.3: actually observing the caving degree and caving time of the goaf on site;
step 2.4: and detecting the deformation of the roadway measured by the cross-shaped piles of the roadway.
Step 2.5: and (4) calculating and analyzing the data detected in the steps 2.2-2.4, and judging whether the hydraulic pre-fracturing achieves the best effect.
Step 2.6: the hydraulic pressure pre-cracking parameters which enable the deformation of the roadway at the advanced part of the fully mechanized mining face to be minimum, the degree of crushing inside the rock of the roadway roof to be maximum, the caving degree of the goaf to be most compact and the caving time to be shortest are used as the optimal hydraulic pressure pre-cracking parameters.
In the scheme, by using the acoustic emission monitoring equipment, the cross pile arrangement of the roadway and the diversified monitoring of field observation, the monitoring data is more accurate, the internal change condition and the external change condition of the roadway surrounding rock are simultaneously monitored in the hydraulic pre-fracturing process, and the monitoring data is more comprehensive; and a plurality of indexes are used as evaluation basis of the hydraulic pre-fracturing effect, so that the determination result of the hydraulic pre-fracturing parameters is more accurate. By continuously adjusting the hydraulic pre-cracking parameters, the hydraulic pre-cracking effect can be optimal finally, and the working efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A hydraulic pre-fracturing parameter determination method is characterized by comprising the following steps:
arranging a plurality of cross pile distribution points on a return airway and a transportation lane of the fully mechanized mining face, wherein the distance between two adjacent cross pile distribution points is a set distance L;
arranging an acoustic emission probe and a hydraulic pre-splitting drill hole between every two adjacent cross pile laying points, wherein the distance between every two adjacent acoustic emission probes is a set distance LS, and the distance between every two adjacent hydraulic pre-splitting drill holes is a set distance LT;
performing water injection pre-splitting on the hydraulic pre-splitting drill hole, and adjusting parameters of the hydraulic pre-splitting drill hole in the water injection process;
in the process of adjusting the hydraulic pressure pre-fracturing drilling parameters, recording the corresponding roadway deformation, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time under different hydraulic pressure pre-fracturing parameters;
and determining the hydraulic pre-fracturing parameters which enable the hydraulic pre-fracturing effect to meet the requirements according to the deformation of the roadway, the rock crushing degree in the roadway roof, the caving degree of the goaf and the caving time.
2. The hydraulic pre-fracturing parameter determination method of claim 1, wherein the roadway deformation is obtained by:
and monitoring the distance between the upper wall of the roadway and the central line of the roadway, the distance between the lower wall of the roadway and the central line of the roadway and the distance between the middle roof and the bottom plate of the roadway to obtain the deformation of the roadway.
3. The hydraulic fracturing parameter determination method according to claim 1, wherein the roadway deformation amount corresponding to the hydraulic fracturing parameter is obtained by:
and acquiring a detection result of the acoustic emission probe in real time, and determining the distance between the acoustic emission probe and the boundary of the roadway according to the signal emission time, the signal receiving time and the signal wavelength of the acoustic emission probe so as to determine the deformation of the roadway.
4. The hydraulic pre-crack parameter determination method as claimed in any one of claims 1 to 3, wherein the degree of rock fragmentation inside the roadway roof is obtained by:
and acquiring a detection result of the acoustic emission probe in real time, acquiring a rock fracture inside the roadway roof according to the detection result, and acquiring the rock crushing degree inside the roadway roof according to the rock fracture.
5. The hydraulic pre-fracturing parameter determination method of claim 4, wherein:
the distance between two adjacent cross pile laying points, the distance between two adjacent acoustic emission probes and the distance between two adjacent hydraulic pre-splitting drill holes are the same.
6. The hydraulic pre-fracturing parameter determination method of claim 5, wherein:
the hydraulic pre-fracturing drilling parameters include, but are not limited to, drilling hole diameter, hole depth, angle, drilling hole location, and water injection timing.
7. The hydraulic pre-fracturing parameter determination method according to any one of claims 1 to 4, characterized in that the acoustic emission probe is set by:
and punching a hole at the position where the acoustic emission probe is arranged, and sealing the hole opening after the acoustic emission probe is arranged at the set depth inside the hole.
8. The hydraulic pre-fracturing parameter determination method of claim 7, wherein:
the set depth is equal to the distance between two adjacent cross pile arrangement points, the distance between two adjacent acoustic emission probes and the distance between two adjacent hydraulic pre-splitting drill holes.
9. The hydraulic pre-fracturing parameter determination method of claim 8, wherein:
the set depth and the distance between two adjacent cross pile arrangement points, the distance between two adjacent acoustic emission probes and the distance between two adjacent hydraulic pre-splitting drill holes are 10 +/-1 m.
10. The hydraulic pre-fracturing parameter determination method of any of claims 1-4, wherein:
in the step of arranging the acoustic emission probe and the hydraulic pre-splitting drill hole between every two adjacent cross-shaped pile arrangement points, the maximum depth value of the hydraulic pre-splitting drill hole is equal to the distance between every two adjacent cross-shaped pile arrangement points, the distance between every two adjacent acoustic emission probes and the distance between every two adjacent hydraulic pre-splitting drill holes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203533A (en) * | 2021-04-06 | 2021-08-03 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for verifying support body of roadway with large rock burst |
| CN115096714A (en) * | 2022-08-25 | 2022-09-23 | 中国长江三峡集团有限公司 | Fracturing physical simulation experiment device and using method thereof |
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