CN106014408B - A kind of apparatus and method of goaf overlying solid rock fracturing - Google Patents
A kind of apparatus and method of goaf overlying solid rock fracturing Download PDFInfo
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- CN106014408B CN106014408B CN201610531136.4A CN201610531136A CN106014408B CN 106014408 B CN106014408 B CN 106014408B CN 201610531136 A CN201610531136 A CN 201610531136A CN 106014408 B CN106014408 B CN 106014408B
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- 239000011435 rock Substances 0.000 title claims abstract description 115
- 239000007787 solid Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000007710 freezing Methods 0.000 claims abstract description 29
- 230000008014 freezing Effects 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 43
- 239000010959 steel Substances 0.000 claims description 43
- 238000005553 drilling Methods 0.000 claims description 34
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 230000008602 contraction Effects 0.000 claims description 7
- 239000003566 sealing material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- -1 on the one hand Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 claims description 2
- 235000013372 meat Nutrition 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/16—Other methods or devices for dislodging with or without loading by fire-setting or by similar methods based on a heat effect
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
Abstract
The present invention can provide a kind of apparatus and method of goaf overlying solid rock fracturing for enterprise, injection high pressure-temperature water and high pressure low temperature freezing liquid in the device first backward above goaf rockhole, can safely, quick fracturing goaf overlying solid rock.Biggest advantage of the present invention is a set of technique while utilizes two kinds of principle fracturing rock mass, first, heterogeneous object, under the conditions of expanding with heat and contract with cold, therein can generate tensile stress, and object is caused to rupture, second is that making full use of the anti-dilating principle of water（Water is 4oHereinafter, as temperature reduces, volume expands C instead）, rock mass hole is forced to extend, is cracked at hole tip, many mushy collective effects also result in rock masses fracturing.In addition, water filling can moisten rock mass, when rock masses fracturing is caving, mutual friction will not generate spark with shock.
Description
Technical field
The present invention relates to a kind of technologies of fracturing rock mass, are applied in advance to above goaf solid rock especially with regard to one kind
Work drills, and injects high-temperature water and cryogenic freezing liquid into hole successively, makes full use of the anti-expansion expanded with heat and contract with cold with water of rock
Principle makes the apparatus and method of goaf overlying solid rock fracturing.
Background technology
In underground coal mine, with the exploitation of coal, coal working face rear necessarily leaves goaf.
When the intensity of top covering rockmass is not very high, under action of underground, working face often pushes ahead a distance,
Rock mass will voluntarily be broken, be caving and bashing；, whereas if rock mass is hard, intensity is higher, then needs until working face
When advance distance is long, it can be broken, be caving.
If goaf top covering rockmass cannot be caving in time, bigger space can be formed（Full of gas and air
Mixed gases）；With the propulsion of working face, it will sometime there is the fracture of top covering rockmass unexpected bulk, showing of being caving
As, and then the gas moment accumulated in goaf is pressed into working face, and with huge dynamic effect, great personnel is caused to hinder
It dies and property loss.
For the fracturing technique of goaf top covering rockmass and equipment aspect, the technique taken earliest is beaten to rock mass
Bore, using explosive charge, the shortcomings that avalanche rock mass, the technique is maximum be it is easy generate spark, goaf gas is caused to explode；Afterwards
Develop hydraulic fracturing and carbon dioxide phase transformation fracturing technique in succession.
Hydraulic fracturing purely utilizes highly pressurised liquid pressure break rock, on the one hand, high pressure water is easily hurted sb.'s feelings, on the other hand, easily
Cause water in gob area.Carbon dioxide phase transformation fracturing is to allow dry ice transient evaporation, utilizes high pressure gas fracturing rock, on the one hand,
Gas pressure is limited, and fracturing effect is bad, on the other hand, is easily mutually hit, generates during being caving by the sillar of pressure break
Spark causes goaf gas to explode.
Therefore, in order to effectively prevent disaster caused by solid rock is caving on a large scale above coal mine gob；It is badly in need of
A kind of technique and device for being capable of effective fracturing rock mass is explored, makes its propulsion with working face and is caving in time, and will not
Spark is generated because frictional impact acts on.
Invention content
Technical problem underlying to be solved by this invention be to provide a kind of device of goaf overlying solid rock fracturing with
Method.
Solving the technical solution of above-mentioned technical problem is：A kind of device of goaf overlying solid rock fracturing, goaf
Top be followed successively by layer to be caving and be not caving layer, the layer to be caving is by the upward construction drill in its bottom surface, rock mass fracturing device
It is connected with drilling；Rock mass fracturing device includes liquid injection pipe, liquid back pipe, high-pressure rubber pipe, topping-up pump, heater, the storage of cryogenic freezing liquid
Tank, three-way steel tube, valve, pressure gauge and thermometer, the liquid injection pipe is parallel with liquid back pipe to be penetrated in drilling, and drilling bottom end is by sealing
Porous materials seal；Liquid back pipe connects two liquid outlets of three-way steel tube, threeway with the lower end of liquid injection pipe by high-pressure rubber pipe respectively
The inlet connection underground network of rivers of steel pipe is simultaneously equipped with valve；Pressure gauge and thermometer are connected on the liquid back pipe, liquid back pipe is extremely
Valve is set on pipeline between three-way steel tube；The liquid injection pipe to the pipeline upper edge feed liquor direction sequence between three-way steel tube is set
Put heater and topping-up pump, a cryogenic freezing liquid storage tank in parallel on heater to the tube body between topping-up pump, the storage of cryogenic freezing liquid
Tank and heater set valve respectively；In work, high-temperature water is injected into drilling by the rock mass fracturing device, high-temperature water into
Enter layer drilling surrounding rock body hole to be caving, rock mass moistening, expansion；Then the high-temperature water in drilling is discharged rapidly, and is filled with height
Force down warm freezing liquid, on the one hand, rock mass cooling meat, due to the inhomogeneities of rock mass in itself, different location contraction speed exists
Difference, so as to generate tensile stress, fracturing rock mass in rock mass；On the other hand, after the high-temperature water of rock mass pore interior is cooled to ice,
Volume expansion struts hole, and numerous holes act on fracturing rock mass simultaneously.
The drilling is inclined hole, penetrates through layer to be caving, and angle of inclination is 30-60 degree.
The bottom end of the close drilling of the liquid back pipe nozzle.
Sealing material is cement mortar.
By fastener for connection between the heater and topping-up pump.
The high-pressure rubber pipe intensity is high, injects highly pressurised liquid, will not rupture.
The topping-up pump can inject liquid into drilling, and maintain certain pressure；The heater can heat liquid,
It is increased to certain temperature；The heat insulation effect of the cryogenic freezing liquid storage tank is preferable, can effectively prevent heat exchange.
Between each component, mainly using thread connection.
A kind of method of goaf overlying solid rock fracturing, the specific steps are：
Step 1）The valve of liquid-feeding tube, heat pump and cryogenic freezing liquid storage tank is closed, opens the inlet of three-way steel tube
Valve to heater water filling, until filling water in heater, closes the inlet valve of three-way steel tube；
Step 2）When the water temperature in heater reaches certain temperature, opening heater valve, priming pump, by high-temperature water
In injection hole, the water in drilling is made to maintain certain pressure and temperature；
Step 3）If water is inadequate, step 1~2 are repeated, high-temperature water is repeatedly injected into drilling；
Step 4）After a period of stabilisation, if the pressure of water declines in drilling, it is high to continue supplement according to step 1~2
Warm water；If pressure is constant, and temperature declines, then opens liquid back pipe valve, and the water allowed in drilling enters heating by liquid back pipe
Device reheats simultaneously injection hole, rock mass is allowed fully to be expanded under the action of soaking of high-temperature water with pressure；
Step 5）There is moistening with after water drenching phenomenon, opening simultaneously liquid back pipe valve and three-way steel tube feed liquor wait being caving rock stratum
Mouth valve, bleeder off hole water；Drilling Water discharge finishes, and closes liquid back pipe valve and heating pump valve, opens the storage of cryogenic freezing liquid
Tank valve runs through topping-up pump and cryogenic freezing liquid is injected into drilling, reduces rock temperature；On the one hand, according to expanding with heat and contract with cold
Principle, rock mass are shunk rapidly, meanwhile, the Heterogeneous Characteristics based on rock mass, the contraction severe degree of rock mass inside different location is deposited
In difference, cause to crack inside rock mass；On the other hand, according to the anti-dilating principle of water, after water becomes ice, volume is swollen
It is swollen, rock mass hole is strutted, the extension of numerous microscopic voids effectively reduces rock mass strength, and cracks；In terms of above-mentioned two
Under the collective effect of fracturing effect, and it is aided with by not being caving the mine stress transmitted rock stratum, realizes the fast of rock stratum to be caving
Quick-break is split, is caving；Moreover, rock mass has moistened, during being caving, spark will not be generated.
Pressure described in step 2 is 2MPa, and temperature is 80-100 degrees Celsius；Stabilization time described in step 4 is 2 hours.
The beneficial effects of the invention are as follows：
The present invention can provide a kind of apparatus and method of goaf overlying solid rock fracturing for enterprise, and the device is first backward
Injection high pressure-temperature water and high pressure low temperature freezing liquid in above goaf rockhole, can safely, quick fracturing goaf overlying
Solid rock.Biggest advantage of the present invention is a set of technique while utilizes two kinds of principle fracturing rock mass, first, heterogeneous object exists
Under the conditions of expanding with heat and contract with cold, therein can generate tensile stress, and object is caused to rupture, second is that making full use of the anti-dilating principle of water
（Water is 4oHereinafter, as temperature reduces, volume expands C instead）, rock mass hole is forced to extend, is cracked at hole tip,
Many mushy collective effects also result in rock masses fracturing.In addition, water filling can moisten rock mass, when rock masses fracturing is caving, mutually it
Between friction and shock will not generate spark.
Description of the drawings
Fig. 1 is the structure diagram of the present invention.
It is marked in figure as follows：It is not caving rock stratum 1, rock stratum to be caving 2, working face wall 3, rock mass hole 4, erecting dense individual props
Spoil 5, sealing material 6, liquid back pipe 7, liquid injection pipe 8, high-pressure rubber pipe 9, high-pressure rubber pipe 10, valve 11, cryogenic freezing liquid storage tank 12,
Topping-up pump 13, linking steel tubes 14, high-pressure rubber pipe 15, valve 16, valve 17, heater 18, high-pressure rubber pipe 19, three-way steel tube 20,
Valve 21, thermometer 22, pressure gauge 23, linking steel tubes 24 and linking steel tubes 25.
Specific embodiment
A kind of device of goaf overlying solid rock fracturing, including liquid injection pipe 8, liquid back pipe 7, high-pressure rubber pipe 9,10,19,
Topping-up pump 13,14,24,25 heater 18 of linking steel tubes, cryogenic freezing liquid storage tank 12, three-way steel tube 20, valve 11,16,17,
21st, pressure gauge 23 and thermometer 22.
By the natural law, working face wall 3 is located at bottom, and rock stratum 2 to be caving is placed in the middle, is not caving rock stratum 1 topmost,
Rock mass hole 4 is distributed in rock stratum 2 to be caving, and large number of；Erecting dense individual props spoil 5, which is piled up, rock stratum 1 and to be treated in not being caving
It is caving the lower section of rock stratum 2.
Sealing material 6 is positioned over the bore entrance position of rock stratum 2 to be caving, and liquid back pipe 7 and liquid injection pipe 8 penetrate sealing material
6, and the penetration depth of liquid back pipe 7 is shallower.
By high-pressure rubber pipe 9, liquid back pipe 7 and three-way steel tube 20 are linked up, connecting mode is thread connection, and
Valve 11 is configured on high-pressure rubber pipe 9.
By high-pressure rubber pipe 10, liquid injection pipe 8 and topping-up pump 13 are linked up, connecting mode is thread connection；Connection
One end of steel pipe 14 is connected with topping-up pump 13, and the other end is connected with heater 18, and centre connects temperature by high-pressure rubber pipe 15
Liquid storage tank 12 is freezed, connecting mode is thread connection, and valve 17 is configured on linking steel tubes 14, for controlling heater 18
Water outlet,
Valve 16 is configured on high-pressure rubber pipe 15, goes out liquid for control connection temperature freezing liquid storage tank 12.
By high-pressure rubber pipe 19, heater 18 and three-way steel tube 20 are linked up, connecting mode is thread connection, and
Water inlet and draining that valve 21 is used to control whole device are configured on three-way steel tube 20.
Three-way steel tube 20 is communicated with underground coal mine water supply network, and cryogenic freezing is stored in advance in cryogenic freezing liquid storage tank 12
Liquid.
By linking steel tubes 24, thermometer 22 and liquid back pipe 7 are linked up, connecting mode is thread connection；Pass through
Linking steel tubes 25 link up pressure gauge 23 and liquid back pipe 7, and connecting mode is thread connection.
One embodiment of the present of invention is as follows：
It is not caving rock stratum 1 as granite, thick 10m；Rock stratum 2 to be caving be sandstone, thick 5m；Working face wall 3 is anthracite,
Thick 8m；5 lumpiness of erecting dense individual props spoil is not of uniform size, piles up in a jumble；Rock mass hole 4 is substantially oblong-shaped, the long 1mm of major semiaxis,
The long 0.5mm of semi-minor axis.
Sealing material 6 is cement mortar, and long 0.8m, diameter is consistent with bore diameter, is 75mm；Liquid back pipe 7 is stainless steel
Steel pipe, internal diameter 20mm, wall thickness 2mm, long 2m；Liquid injection pipe 8 be stainless-steel pipe, internal diameter 30mm, wall thickness 2mm, long 3m.
High-pressure rubber pipe 9,10,15 and 19 is the high temperature and pressure sebific duct under R13 type multilayer steel wire winding harsh conditions；Valve
11st, 16,17 and 21 model RQZ series of security stop valves.
Cryogenic freezing liquid storage tank 12 is LNG low-temperature storage tanks, and cryogenic freezing liquid is alcohol；Topping-up pump 13 is 3ZBQS1210 types
Coal mine biliquid Pneumatic grouting pump；Linking steel tubes 14 be stainless-steel pipe, internal diameter 20mm, wall thickness 2mm, long 1m；Heater 18 is
CREx020-100W type anti-explosion heaters；Three-way steel tube 20 be stainless-steel pipe, One In and Two Out, internal diameter 20mm, wall thickness 2mm.
Linking steel tubes 24 and linking steel tubes 25 are stainless-steel pipe, and internal diameter 20mm, wall thickness 2mm, length is 0.4m respectively
And 0.3m；The model YTXC-150-Z that pressure gauge 23 is, thermometer 22 are dial thermometer.It is mainly used between each section
Thread connection.
The course of work of the present invention is as follows：
In advance to 2 construction drill of rock stratum to be caving, then sealing drills and arranges liquid back pipe 7 and liquid injection pipe 8, utilizes height
Moulding pipe 9 couples liquid back pipe 7 and three-way steel tube 20, couples liquid injection pipe 8 and topping-up pump 13 using high-pressure rubber pipe 10, utilizes high-pressure glue
Pipe 15 couples cryogenic freezing liquid storage tank 12 and linking steel tubes 14, couples topping-up pump 13 and heater 18, profit using linking steel tubes 14
Couple heater 18 and three-way steel tube 20 with high-pressure rubber pipe 19；Valve 11,16,17 is closed, opens valve 21 to 18 note of heater
Water after filling it up with, closes valve 21.
When the water temperature in heater 18 reaches 80-100 degrees Celsius, valve 17, priming pump 13, by high-temperature water are opened
In injection hole；If water is inadequate, high-temperature water can be repeatedly injected into drilling as stated above, and maintains pressure 2MPa left
The right side,（It is observed by pressure gauge 23）And temperature（It is observed by thermometer 22）, the moistening of field observation rock stratum 2 to be caving and water drenching
Situation.
After stablizing 2 hours, if the pressure of Drilling Water declines, continue to supplement high-temperature water, if pressure is constant, and temperature
Decline, then open valve 11, the water allowed in drilling enters heater 18 by liquid back pipe, reheats simultaneously injection hole；Allow rock
Body fully expands under the action of soaking of high-temperature water with pressure.
When observe wait be caving rock stratum 2 occur moistening with water drenching phenomenon after, open valve 11,21, bleeder off hole water, so
Afterwards, valve 11,17 is closed, opens valve 16, topping-up pump 13 is run through and cryogenic freezing liquid is injected into drilling, reduce rock mass temperature
Degree.On the one hand, according to thermal expansion and contraction principle, rock mass can be shunk rapidly, meanwhile, the Heterogeneous Characteristics based on rock mass, inside rock mass
The contraction severe degree of different location has differences, and causes to crack inside rock mass；On the other hand, it is former according to the anti-expansion of water
Reason, after water becomes ice, volume expands instead, can strut rock mass hole, and the extension of numerous microscopic voids can effectively reduce rock mass
Intensity, and in the generation for macroscopically showing as crackle.
In terms of the above-mentioned two under the collective effect of fracturing effect, and it is aided with the mine transmitted by not being caving rock stratum 1
Stress can realize the fast fracture of rock stratum 2 to be caving, be caving substantially；Moreover, rock mass has moistened, during being caving, no
Spark can be generated.
Claims (10)
1. a kind of device of goaf overlying solid rock fracturing, it is followed successively by layer to be caving above goaf and is not caving layer,
The layer to be caving is connected by the upward construction drill in its bottom surface, rock mass fracturing device with drilling；It is characterized in that, rock mass fracturing fills
It puts including liquid injection pipe, liquid back pipe, high-pressure rubber pipe, topping-up pump, heater, cryogenic freezing liquid storage tank, three-way steel tube, valve, pressure
Table and thermometer, the liquid injection pipe is parallel with liquid back pipe to be penetrated in drilling, and drilling bottom end is sealed by sealing material；Liquid back pipe and note
The lower end of liquid pipe connects two liquid outlets of three-way steel tube, the inlet connection mine water of three-way steel tube by high-pressure rubber pipe respectively
Net is simultaneously equipped with valve；Pressure gauge and thermometer are connected on the liquid back pipe, is set on liquid back pipe to the pipeline between three-way steel tube
Put valve；The liquid injection pipe is heated to pipeline upper edge feed liquor direction sequence setting heater and topping-up pump between three-way steel tube
One cryogenic freezing liquid storage tank of parallel connection on device to the tube body between topping-up pump, cryogenic freezing liquid storage tank and heater set valve respectively
Door；In work, high-temperature water is injected into drilling by the rock mass fracturing device, high-temperature water enters layer to be caving drilling surrounding rock
Body opening gap, rock mass moistening, expansion；Then the high-temperature water in drilling is discharged rapidly, and is filled with high pressure low temperature freezing liquid, on the one hand,
Rock mass cooling meat, due to the inhomogeneities of rock mass in itself, different location contraction speed has differences, so as to be generated in rock mass
Tensile stress, fracturing rock mass；On the other hand, after the high-temperature water of rock mass pore interior is cooled to ice, volume expansion struts hole,
Numerous holes act on fracturing rock mass simultaneously.
A kind of 2. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that the drilling
For inclined hole, layer to be caving is penetrated through, angle of inclination is 30-60 degree.
A kind of 3. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that described time liquid
The bottom end of the close drilling of pipe nozzle.
A kind of 4. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that sealing material
For cement mortar.
A kind of 5. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that the heating
By fastener for connection between device and topping-up pump.
A kind of 6. device of goaf overlying solid rock fracturing according to claim 5, which is characterized in that described time liquid
It manages as stainless-steel pipe, internal diameter 20mm, wall thickness 2mm；The liquid injection pipe be stainless-steel pipe, internal diameter 30mm, wall thickness 2mm；Connection
Steel pipe is stainless-steel pipe, internal diameter 20mm, wall thickness 2mm；The three-way steel tube be stainless-steel pipe, One In and Two Out, internal diameter 20mm,
Wall thickness 2mm.
A kind of 7. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that high-pressure rubber pipe
For the high temperature and pressure sebific duct under R13 type multilayer steel wire winding harsh conditions.
A kind of 8. device of goaf overlying solid rock fracturing according to claim 1, which is characterized in that cryogenic freezing
Liquid storage tank is LNG low-temperature storage tanks, and cryogenic freezing liquid is alcohol；Topping-up pump is the mining biliquid Pneumatic grouting pump of 3ZBQS1210 moulded coals；
Heater is CREx020-100W type anti-explosion heaters.
A kind of 9. method of goaf overlying solid rock fracturing, which is characterized in that the specific steps are：
Step 1）The valve of liquid-feeding tube, heat pump and cryogenic freezing liquid storage tank is closed, opens the inlet valve of three-way steel tube,
To heater water filling, until filling water in heater, the inlet valve of three-way steel tube is closed；
Step 2）When the water temperature in heater reaches certain temperature, opening heater valve, priming pump injects high-temperature water
In drilling, the water in drilling is made to maintain certain pressure and temperature；
Step 3）If water is inadequate, step 1~2 are repeated, high-temperature water is repeatedly injected into drilling；
Step 4）After a period of stabilisation, if the pressure of water declines in drilling, continue to supplement high-temperature water according to step 1~2；
If pressure is constant, and temperature declines, then opens liquid back pipe valve, and the water allowed in drilling enters heater by liquid back pipe, weight
New heating and injection hole, allow rock mass fully to be expanded under the action of soaking of high-temperature water with pressure；
Step 5）There is moistening with after water drenching phenomenon, opening simultaneously liquid back pipe valve and three-way steel tube inlet valve wait being caving rock stratum
Door, bleeder off hole water；Drilling Water discharge finishes, and closes liquid back pipe valve and heating pump valve, opens cryogenic freezing liquid storage tank valve
Door runs through topping-up pump and cryogenic freezing liquid is injected into drilling, reduces rock temperature；On the one hand, according to thermal expansion and contraction principle,
Rock mass is shunk rapidly, meanwhile, the Heterogeneous Characteristics based on rock mass, the contraction severe degree of rock mass inside different location is in the presence of poor
It is different, cause to crack inside rock mass；On the other hand, according to the anti-dilating principle of water, after water becomes ice, volume expansion is supportted
Rock mass hole is opened, the extension of numerous microscopic voids effectively reduces rock mass strength, and cracks；The fracturing in terms of above-mentioned two
Under the collective effect of effect, and it is aided with by not being caving the mine stress transmitted rock stratum, realizes the fast quick-break of rock stratum to be caving
It splits, be caving；Moreover, rock mass has moistened, during being caving, spark will not be generated.
10. the method for a kind of goaf overlying solid rock fracturing according to claim 9, which is characterized in that in step 2
The pressure is 2MPa, and temperature is 80-100 degrees Celsius；Stabilization time described in step 4 is 2 hours.
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| CN201610531136.4A CN106014408B (en) | 2016-07-07 | 2016-07-07 | A kind of apparatus and method of goaf overlying solid rock fracturing |
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| CN106948816B (en) * | 2017-03-21 | 2018-10-30 | 太原理工大学 | Automatic energy storage high pressure fluid injection CO2Phase conversion pulse coal and rock fracturing method |
| CN107701157A (en) * | 2017-09-30 | 2018-02-16 | 太原理工大学 | A kind of device and method of underground heat injection transformation coal seam physical characteristic |
| CN108894782B (en) * | 2018-07-31 | 2020-04-17 | 中南大学 | Low-temperature frost heaving cracking induced ore body caving mining method |
| CN110985110B (en) * | 2019-12-18 | 2021-06-25 | 中南大学 | High-gas tight coal seam pumping and injecting integrated system and method |
| CN111173513B (en) * | 2020-03-16 | 2020-11-27 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
| CN116378659A (en) * | 2023-03-28 | 2023-07-04 | 长春工程学院 | Microwave heating and water cooling combined fracturing induced caving mining method |
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| CN104061013A (en) * | 2014-06-23 | 2014-09-24 | 中国矿业大学 | Method and device for improving permeability of low-permeability coal bed by utilizing freezing process |
| CN104213932A (en) * | 2014-08-07 | 2014-12-17 | 中国矿业大学 | Outburst coal bed hydraulic phase change cracking cross-cut coal uncovering method |
| CN104712302A (en) * | 2015-04-14 | 2015-06-17 | 新疆大学 | Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir |
| CN105134284A (en) * | 2015-08-03 | 2015-12-09 | 中国矿业大学 | Gas extraction method based on horizontal orientation boring liquid nitrogen cycle freeze-thaw anti-reflection |
| CN205823280U (en) * | 2016-07-07 | 2016-12-21 | 华北科技学院 | A kind of device of goaf overlying solid rock fracturing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061013A (en) * | 2014-06-23 | 2014-09-24 | 中国矿业大学 | Method and device for improving permeability of low-permeability coal bed by utilizing freezing process |
| CN104213932A (en) * | 2014-08-07 | 2014-12-17 | 中国矿业大学 | Outburst coal bed hydraulic phase change cracking cross-cut coal uncovering method |
| CN104712302A (en) * | 2015-04-14 | 2015-06-17 | 新疆大学 | Cyclic freezing-melting anti-reflection method for low-permeability coal-bed gas reservoir |
| CN105134284A (en) * | 2015-08-03 | 2015-12-09 | 中国矿业大学 | Gas extraction method based on horizontal orientation boring liquid nitrogen cycle freeze-thaw anti-reflection |
| CN205823280U (en) * | 2016-07-07 | 2016-12-21 | 华北科技学院 | A kind of device of goaf overlying solid rock fracturing |
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