AU2022453302A1 - Impact-prevention pressure-relief tunneling method for rock burst coal seam roadway - Google Patents
Impact-prevention pressure-relief tunneling method for rock burst coal seam roadway Download PDFInfo
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- AU2022453302A1 AU2022453302A1 AU2022453302A AU2022453302A AU2022453302A1 AU 2022453302 A1 AU2022453302 A1 AU 2022453302A1 AU 2022453302 A AU2022453302 A AU 2022453302A AU 2022453302 A AU2022453302 A AU 2022453302A AU 2022453302 A1 AU2022453302 A1 AU 2022453302A1
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- 239000003245 coal Substances 0.000 title claims abstract description 72
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000005641 tunneling Effects 0.000 title claims abstract description 17
- 238000005553 drilling Methods 0.000 claims abstract description 210
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010586 diagram Methods 0.000 claims description 10
- 238000005065 mining Methods 0.000 abstract description 5
- 238000001881 scanning electron acoustic microscopy Methods 0.000 abstract description 2
- 101710126596 Peptidyl-alpha-hydroxyglycine alpha-amidating lyase A Proteins 0.000 abstract 1
- 102100035559 Transcriptional activator GLI3 Human genes 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation 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
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
J 4ht1-* JP)9t2I IN Vif EPi
(119)WA
() Pd VT, WO 2023/197573 A1
2023 4 10 ) 19 (19.10.2023) WIPO T PWC0T
(51) M p -A : (72)&fAl h:;f 4 N(PAN,Junfeng); + LflJI
E21C37/12 (2006.01) E21B 7/04 (2006.01) Z X + t4R N X I N H M 1
(21) M p: $ i-: PCT/CN2022/128958 Beijing 102206 (CN)o P,& 3 (MA, Wentao);
(22) M p: $jig E: 2022 4 111A 1 ] (01.11.2022) 1BI Beijing 102206 (CN)o - 3A5H(ZHANG,
(25) $igjF: 9c Chenyang); FPld J 1'N'l Z++ttt4# Z J'il
I f $1 , Beijing 102206 (CN) o l (26) L tffF :c (GAO,Jiaming); + d1L~ i'M Z tit4tH
(30) I fZy: X JICXlISle f i$1, Beijing 102206 (CN) o
202210397287.0 202244A15H (15.04.2022) CN Ifl(LU,Chuang); + d Sbillf 1 3CZ+t'4tlH
(71) $IMk I >: j J- ff dff 5 pA; PR / is) (CCTEG k)LH N IS f 1I, Beijing 102206 (CN)o
COAL MINING RESEARCH INSTITUTE) [CN/CN]; (74) 4tItA: J L -, - - fl fR it At TTili$§
+ NI1L 7 iTJ'IVX +t$t4flZJ'IDilMPF ( M-i A Q) (TSINGYIHUA INTELLECTUAL
IIe fl§19cBeijing 102206 (CN)o
(54) Title: IMPACT-PREVENTION PRESSURE-RELIEF TUNNELING METHOD FOR ROCK BURST COAL SEAM ROAD
WAY
(5 4) &PA -A' fT: '+ if r KW81P ~i~~tF± 4a
A f104 4A ai 14tUl A 9 Y), ik~4 S102 Determine, in an area to be tunneled of a coal seam
4 f&t , fN4%th , S102 roadway, a fracturing target horizon satisfying a preset
4 L t4t Rcondition, and determine the number of directional
drilling holes according to the number of layers of the
fracturing target horizon
S104 Arrange a drill site in the coal seam roadway, construct a
-4 i A 14 , /A tt lb 4* N6 R El 4t directional drilling hole from the drill site to the fracturing
& ti, kt tt ~t i S104 target horizon, and fracture the constructed directional
drilling hole
S106 Continue tunneling the coal seam roadway, if the length
of a fracturing coverage area of an overlying top plate
1 remains a preset length, arrange the drill site again,
construct a directional drillinghole from the drill site
9ik4,AAr_i-1~i, A T K hrt,&Rt1 ;iI arranged again to the fracturing target horizon, and
P W-i ~±, k M4, AL4kiii / S106 fracture the constructed directional drilling hole
- i M54 -Ti hvjtJR El4 4A__ Z( 1 ~4 L, Ri
(57) Abstract: The present invention provides an impact-prevention pressure-relief tunneling method for a rock burst coal seam road
way, comprising: determining, in an area to be tunneled of a coal seam roadway, a fracturing target horizon satisfying a preset condition,
and determining the number of directional drilling holes according to the number of layers of the fracturing target horizon; arranging
a drill site in the coal seam roadway, constructing a directional drilling hole from the drill site to the fracturing target horizon, and
fracturing the constructed directional drilling hole; continuing tunneling the coal seam roadway, if the length of a fracturing coverage
area of an overlying top plate remains a preset length, arranging the drill site again, constructing a directional drilling hole from the
drill site arranged again to the fracturing target horizon, and fracturing the constructed directional drilling hole.
o I_ .F lP A Y L tis MTL J fltiQ&'NDA A-M fRIT~Q& FRt t~ Vi~
W O 2023/197573 A 1 |||11|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
PROPERTYLLC); +[jdBN !rii~t xdB9M45
91tk2) 201, Beijing 100142 (CN)o
AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG,
BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU,
CV, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI,
GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IQ,
R, IS, IT, JM, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ,
LA, LC, LK, LR, LS, LU, LY, MA, MD, MG, MK, MN,
MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE,
PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE,
SG, SK, SL, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ,
UA, UG, US, UZ, VC, VN, WS, ZA, ZM, ZWc
fi)): ARIPO (BW, CV, GH, GM, KE, LR, LS, MW,
MZ, NA, RW, SC, SD, SL, ST, SZ, TZ, UG, ZM, ZW), R
[E(AM, AZ, BY, KG, KZ, RU, TJ, TM),[ )+I (AL, AT,
BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR,
HR, HU, IE, IS, IT, LT, LU, LV, MC, ME, MK, MT, NL,
NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ,
CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE,
SN, TD, TG).
- 1tK Fi f *IR (*j9M21*(3))
Description
This application claims priority to and benefits of Chinese Patent Application No.
202210397287.0, filed with the China National Intellectual Property Administration on April 15,
2022, the contents of which are incorporated herein by reference for all purposes.
D The present disclosure relates to a technical field of safety coal mining technology, and more
particularly to an anti-impact and pressure-relief tunneling method for a rock burst-prone coal seam
roadway.
As the coal mining is performed deep underground, the stress of the primary rock is at a
relatively high level, and many structures such as folds and faults are distributed within the well
field. The stress of the primary rock and the structural stress together form a high concentrated stress
foundation. During a process of tunnel-boring to build a roadway, the support pressure is introduced
to form an ultra-high stress concentration, inducing the rock burst.
D Local pressure-relief measures such as coal seam blasting and large-diameter drilling are
usually used for the pressure-relief during the tunnel-boring to form the roadway. On the one hand,
large machinery, construction equipment and support materials are disposed in the boring working
face region, and the space for the pressure-relief is limited. Conventional pressure-relief measures
are always lagging behind, resulting in pressure-relief blind regions at the boring working face and
sides at a certain distance behind. On the other hand, the pressure-relief range of the conventional
local pressure-relief measures is limited, the pressure-relief measures are often required to be
performed for many times during the process of tunnel-boring the roadway, and the pressure-relief
efficiency is low.
In view of the above-mentioned problems, the present disclosure provides in embodiments an anti-impact and pressure-relief tunneling method for a rock burst-prone coal seam roadway to overcome the above-mentioned problems or at least partially solve the above-mentioned problems.
The present method is capable of reducing the stress of the rock stress and the structural stress of
the to-be-bored roadway region regionally and in advance, to allow the to-be-bored roadway region
to be in a pressure-relief protection zone, which effectively reduces the possibility of the rock burst
during the tunnel-boring for the coal seam roadway.
According to a first aspect of embodiments of the present disclosure, an anti-impact and
pressure-relief tunneling method for a rock burst-prone coal seam roadway is provided, and includes:
determining a fracturing target layer that meets a preset condition for a to-be-bored region of a coal
D seam roadway, where a directional drilling hole quantity is determined according to a fracturing
target layer quantity; disposing a drilling site in the coal seam roadway, constructing a directional
drilling hole starting from the drilling site to the fracturing target layer, and fracturing the directional
drilling hole completed; and boring the coal seam roadway, and if a remaining length of a fracturing
coverage of an overlying roof is a preset length, re-disposing the drilling site, constructing a
directional drilling hole starting from the re-disposed drilling site to the fracturing target layer, and
fracturing the directional drilling hole completed.
Optionally, determining the fracturing target layer that meets the preset condition for the to-be
bored region of the coal seam roadway includes: determining a rock layer having a thickness greater
than a specified thickness and located at a height within a preset range above the to-be-bored region
D of the coal seam roadway as the fracturing target layer according to a drilling column diagram.
Optionally, the rock layer with the specified thickness is a thick and hard sandstone layer with
the specified thickness.
Optionally, a rock layer having a thickness of greater than 8 m and located at a height within a
range of 40 m above a coal seam is determined as the fracturing target layer for the to-be-bored
region of the coal seam roadway according to the drilling column diagram.
Optionally, a plurality of the fracturing target layers exists.
Optionally, disposing the drilling site in the coal seam roadway, and constructing the directional
drilling hole starting from the drilling site to the fracturing target layer include: disposing the drilling
site at a position of a preset distance from a to-be-bored roadway in the coal seam roadway according
D to a height of the fracturing target layer that is a fracturing target layer located at a highest position;
constructing the directional drilling hole starting from the drilling site to the fracturing target layer, so that the to-be-bored roadway is located at a horizontal projection region of a horizontal section of the directional drilling hole. One directional drilling hole is correspondingly constructed for one fracturing target layer. Optionally, a length of the horizontal section of the directional drilling hole is from 600 m to 1000 m. Optionally, at least two directional drilling holes exist, and steps of disposing the drilling site in the coal seam roadway, constructing the directional drilling holes starting from the drilling site to the fracturing target layer, and fracturing the directional drilling hole completed include: disposing the drilling site in the coal seam roadway, and setting a sequence of constructing and fracturing the ) directional drilling holes to the fracturing target layer; constructing a first directional drilling hole starting from the drilling site to a first fracturing target layer, and fracturing the first directional drilling hole completed; and constructing a second directional drilling hole starting from the drilling site to a second fracturing target layer, and fracturing the second directional drilling hole completed until constructing and fracturing of the directional drilling holes are completed for all fracturing target layers. Optionally, fracturing the directional drilling hole completed includes: injecting high-pressure water into the horizontal section of each completed directional drilling hole in a segmented manner, and performing a hydraulic fracturing on the horizontal section of the directional drilling hole in the segmented manner. D Optionally, injecting the high-pressure water into the horizontal section of the completed directional drilling hole in the segmented manner, and performing the hydraulic fracturing on the horizontal section of the directional drilling hole in the segmented manner include: sending a packer into the directional drilling hole at a distance from a hole bottom of the directional drilling hole, injecting the high-pressure water into a hole section sealed by the packer to implement the hydraulic fracturing; and retracting the packer to a next position at a specified distance, and injecting the high pressure water into a hole section currently sealed by the packer to implement the hydraulic fracturing until the next position to which the packer is retracted exceeds the horizontal section of the directional drilling hole. Optionally, a length of the hole section to be filled with the high-pressure water is 15 m. D Optionally, the drilling site is re-disposed when the remaining length of the fracturing coverage of the overlying roof is 100 m.
In the embodiments of the present disclosure, the fracturing target layer that meets the preset
condition is determined for the to-be-bored region of the coal seam roadway, and after the directional
drilling hole quantity is determined according to a fracturing target layer quantity, the drilling site is
disposed in the coal seam roadway. The directional drilling hole is constructed starting from the
drilling site to the fracturing target layer, and the completed directional drilling hole is fractured.
After the fracture, the coal seam roadway is built by tunnel-boring. If a remaining length of a
fracturing coverage of an overlying roof is a preset length, the drilling site is re-disposed. The
directional drilling hole is constructed starting from the re-disposed drilling site to the fracturing
target layer, and the completed directional drilling hole is fractured. Therefore, in the embodiments
D of the present disclosure, the directional drilling hole(s) can be used for the to-be-bored region to
perform fracturing on the overlying thick and hard roof of the roadway in a large range completely
to release the pressure. Moreover, by cyclically performing the steps of disposing the drilling site,
constructing the directional drilling hole, and fracturing the directional drilling hole, the overlying
thick and hard roof of the roadway may be fractured continuously and in advance, the stress of the
rock stress and the structural stress of the to-be-bored roadway region may be reduced regionally
and in advance, to allow the to-be-bored roadway region to be in a pressure-relief protection zone,
which effectively reduces the possibility of the rock burst during the tunnel-boring for the coal seam
roadway.
The above description is only an overview of the technical solution of the present disclosure.
D In order to better understand the technical means of the present disclosure, it can be implemented
according to the contents of the description, and in order to make the above and other purposes,
features and advantages of the present disclosure more understandable, specific embodiments of the
present disclosure are described below.
Those skilled in the art will be more aware of the above and other purposes, advantages and
features of the present disclosure according to the following detailed description of the specific
embodiments of the present disclosure in conjunction with the accompanying drawings.
The accompanying drawings described here are used to provide a further understanding of the
D present disclosure, and constitute a part of the present disclosure. The schematic embodiments and
their descriptions of the present disclosure are used to explain the present disclosure, and do not constitute improper limitations to the present disclosure. In the accompanying drawings:
FIG. 1 is a flow chart of an anti-impact and pressure-relief tunneling method for a rock burst
prone coal seam roadway according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram showing directional drilling holes and fracturing the directional
drilling holes of an overlying thick hard rock layer of a to-be-bored roadway according to an
embodiment of the present disclosure;
FIG. 3 is a sectional diagram showing a directional drilling hole and fracturing the directional
drilling hole of an overlying thick hard rock layer of a to-be-bored roadway according to an
embodiment of the present disclosure;
D in the drawings: 1: bored roadway; 2: drilling site; 3: directional drilling hole; 4: fracturing
point of hole section; 5: to-be-bored roadway; 6: fracturing cracks.
Embodiments of the present disclosure will be described in detail below with reference to the
accompanying drawings. Although embodiments of the present disclosure are shown in the drawings,
it should be understood that the present disclosure may be realized in various forms and should not
be limited to the embodiments set forth herein. Instead, these embodiments are provided for more
thorough understanding of the present disclosure and to better explain the scope of the present
disclosure to those skilled in the art.
D In order to solve the above-mentioned technical problems, an anti-impact and pressure-relief
tunneling method for a rock burst-prone coal seam roadway is provided in the embodiments of the
present disclosure. FIG. 1 is a flow chart of an anti-impact and pressure-relief tunneling method for
a rock burst-prone coal seam roadway according to an embodiment of the present disclosure.
Referring to FIG. 1, the anti-impact and pressure-relief tunneling method for the rock burst-prone
coal seam roadway includes the following steps of S102 to S106:
Step S102, determining a fracturing target layer that meets a preset condition for a to-be-bored
region of a coal seam roadway, in which a directional drilling hole quantity is determined according
to a fracturing target layer quantity;
Step S104, disposing a drilling site in the coal seam roadway, constructing a directional drilling
D hole starting from the drilling site to the fracturing target layer, and fracturing the directional drilling
hole completed;
Step S106, boring the coal seam roadway, and if a remaining length of a fracturing coverage of
an overlying roof is a preset length, re-disposing the drilling site, constructing a directional drilling
hole starting from the re-disposed drilling site to the fracturing target layer, and fracturing the
directional drilling hole completed.
In the embodiments of the present disclosure, the directional drilling hole(s) can be used for
the to-be-bored region to perform fracturing on the overlying thick and hard roof of the roadway in
a large range completely to release the pressure. Moreover, by cyclically performing the steps of
disposing the drilling site, constructing the directional drilling hole, and fracturing the directional
drilling hole, the overlying thick and hard roof of the roadway may be fractured continuously and in
D advance, the stress of the rock stress and the structural stress of the to-be-bored roadway region may
be reduced regionally and in advance, thus eliminating dynamic and static load sources that induce
the rock burst, increasing an occurrence threshold of the rock burst, so that the to-be-bored roadway
region is in a pressure-relief protection zone. After fracturing the overlying thick and hard roof for
the rock burst-prone coal seam roadway, tunneling to build the roadway in the fracturing coverage
and using the roadway are under the low stress, and the roadway and the workers at the roadway can
be effectively protected, which effectively reduces the possibility of the occurrence of the rock burst
during the tunnel-boring for the coal seam roadway.
In an embodiment of the present disclosure, the drilling column diagram describes a stratum,
thickness, lithology, structural construction and contact relationship of rock layer(s) in which a hole
D (i.e., a passage) may be drilled, groundwater sampling and testing, a drilling hole structure and a
drilling state, etc., and can be used as an important basis for analyzing geological conditions of the
coal mine. Therefore, the fracturing target layer above the coal seam can be determined according
to the drilling column diagram in the embodiments of the present disclosure.
Specifically, during the execution of Step S102 of determining the fracturing target layer that
meets the preset condition for the to-be-bored region of the coal seam roadway, a rock layer having
a thickness greater than a specified thickness and located at a height within a preset range above the
to-be-bored region of the coal seam roadway may be determined as the fracturing target layer
according to the drilling column diagram. For example, a rock layer having a thickness of greater
than 8 m and located at a height within a range of 40 m above a coal seam is determined as the
D fracturing target layer for the to-be-bored region of the coal seam roadway according to the drilling
column diagram.
In an embodiment of the present disclosure, the rock layer having a thickness of greater than 8
m and located at a height within a range of 40 m is a thick and hard sandstone layer. Referring to
FIG. 2 and FIG. 3, in a coal mine, a thickness of a fine-grained sandstone layer above the coal seam
is 10.2 m, a thickness of a siltstone layer is 11 m, and the two layers each have a thickness greater
than 8 m, and located at the height of less than or equal to 40 m above the coal seam. Therefore, in
the embodiment, two fracturing target layers exist, i.e., the fine-grained sandstone layer and the
siltstone layer.
Normally, one directional drilling hole can be correspondingly constructed for one fracturing
target layer. If there are two fracturing target layers, two directional drilling holes are constructed. If
D there are three fracturing target layers, three directional drilling holes are constructed. One
directional drilling hole is constructed for each fracturing target layer.
Referring to Step S104, in an embodiment of the present disclosure, a drilling site 2 is disposed
in the coal seam roadway (such as a bored roadway 1), and a specific process of constructing the
directional drilling hole starting from the drilling site 2 to the fracturing target layer is as follows.
First, the drilling site 2 is disposed at a position of a preset distance from a to-be-bored roadway
5 in the coal seam roadway according to a height of the fracturing target layer that is a fracturing
target layer located at a highest position.
In the embodiment, the fracturing target layer located at the highest position refers to the
uppermost fracturing target layer. For example, if there is only one fracturing target layer, a position
D of the drilling site 2 is selected as a position of a preset distance from a to-be-bored roadway 5 in
the coal seam roadway according to a height of the fracturing target layer, and the drilling site 2 is
disposed. If there are at least two fracturing target layers, a fracturing target layer located on top is
the fracturing target layer at the highest position. After measuring a height of the fracturing target
layer at the highest position, a position of the drilling site 2 is selected according to the height of the
fracturing target layer at the highest position, and the drilling site 2 is disposed.
In an embodiment, when the position of the preset distance from the to-be-bored roadway 5 is
selected as the position of the drilling site 2 in the coal seam roadway according to the height of the
fracturing target layer at the highest position, a selection standard is such that the region of the to
be-bored roadway is located at a horizontal projection region of a horizontal section of the directional
D drilling hole 3, and the to-be-bored roadway region is thus located in the roof fracturing coverage.
In order to meet the selection standard, for different heights where the fracturing target layer is located, the position of the disposed drilling site 2 will be changed. For example, for a height where the fine-grained sandstone layer is located as shown in FIG. 2, a preset distance may be set as 100 m, or any other distances. In the embodiment, the directional drilling hole 3 located above the to be-bored roadway region may be prevented from being a skewed section, avoiding a fracturing blind region.
The directional drilling hole 3 is constructed starting from the drilling site 2 to the fracturing
target layer, so that the to-be-bored roadway 5 is located at a horizontal projection region of a
horizontal section of the directional drilling hole 3.
In the embodiments of the present disclosure, the horizontal section of the directional drilling
) hole 3 is located directly above the to-be-bored roadway region in the process of constructing the
directional drilling hole 3. For example, the horizontal section of the directional drilling hole 3 can
be constructed with a length of 600 to 1000 m when constructing the directional drilling hole 3 at a
time. Therefore, for the subsequent to-be-bored region, a long directional hole can be constructed at
one time to perform a large range fracturing and pressure-relief for the overlying thick and hard roof
of the roadway.
In an embodiment, if there are at least two fracturing target layers, at least two directional
drilling holes (such as directional drilling holes 3 and 3' in FIG. 2) are constructed accordingly. A
directional drilling hole 3 is constructed starting from the same drilling site 2 to each fracturing
target layer, so that one directional drilling hole 3 is constructed for one fracturing target layer.
D Referring to both FIG. 2 and FIG. 3, the fracturing target layers are the fine-grained sandstone
layer with a thickness of 10.2 m and the siltstone layer with a thickness of 11 m, both located above
the coal seam. In the embodiments of the present disclosure, the directional drilling hole 3 is drilled
starting from the drilling site 2 to the fine-grained sandstone layer, e.g., to a position of 22 m above
the coal seam, and the directional drilling hole 3' is drilled starting from the drilling site 2 to the
siltstone layer, e.g., to a position of 40 m above the coal seam.
In an embodiment of the present disclosure, at least two directional drilling holes exist, during
the execution of Step S104, i.e., constructing the directional drilling holes starting from the drilling
site 2 to the fracturing target layers respectively and fracturing the completed directional drilling
holes, a sequence of constructing and fracturing the directional drilling holes (from the drilling site
) to the fracturing target layers) is predetermined. A first directional drilling hole (such as the
directional drilling hole 3') is constructed starting from the drilling site 2 to a first fracturing target layer, and the first directional drilling hole that has been completed is fractured. Then, a second directional drilling hole (such as the directional drilling hole 3) is constructed starting from the drilling site 2 to a second fracturing target layer, and the second directional drilling hole that has been completed is fractured. For more fracturing target layers, the steps are performed in cycle until constructing and fracturing of the directional drilling holes are completed for all fracturing target layers. Therefore, by setting a sequence of constructing and fracturing the directional drilling holes for different fracturing target layers of the embodiments of the present disclosure, each fracturing target layer can be fractured in sequence according to the set sequence, avoiding interference with the ) construction of other directional drilling hole. In the embodiments of the present disclosure, a method of fracturing the completed directional drilling hole can be a hydraulic fracturing method, that is, high-pressure water is injected into the horizontal section of the completed directional drilling hole in a segmented manner, so that the hydraulic fracturing is performed on the horizontal section of the directional drilling hole in the segmented manner. In an optional embodiment, a method of injecting high-pressure water into the horizontal section of the completed directional drilling hole in the segmented manner and performing the hydraulic fracturing on the horizontal section of the directional drilling hole in the segmented manner may specifically be: sending a packer into the directional drilling hole at a distance from a hole bottom of the ) directional drilling hole, injecting the high-pressure water into a hole section sealed by the packer to implement the hydraulic fracturing; and retracting the packer to a next position at a specified distance, and injecting the high-pressure water into a hole section currently sealed by the packer to implement the hydraulic fracturing until the next position to which the packer is retracted exceeds the horizontal section of the directional drilling hole. The distance specified in an embodiment may be 15 m, that is, a length of the hole section to be filled with the high-pressure water is 15 m. For the case of constructing a plurality of directional drilling holes starting from one drilling site 2 to a plurality of fracturing target layers, the drilling and fracturing work of all directional drilling holes can be performed in sequence. D In an embodiment, the high-pressure water is filled into the directional drilling hole to provide a high pressure, fracturing cracks 6 are formed starting from a fracturing point 4 of a hole section and extending to surrounding of the directional drilling hole, so as to realize the fracturing of the rocks around the directional drilling hole. Referring to the above Step S106, in an embodiment of the present disclosure, if the remaining length of the fracturing coverage of the overlying roof is the preset length, the drilling site is re disposed, the directional drilling hole is constructed starting from the re-disposed drilling site to the fracturing target layer, and completed directional drilling hole is fractured. After the construction of the directional drilling hole is completed and the hydraulic fracturing of the overlying thick and hard roof of the to-be-bored roadway is completed through the directional drilling hole, the coal seam roadway is built by the tunnel-boring. When the remaining length of the D fracturing coverage of the overlying roof is a certain distance (such as 100 m), the drilling site is re disposed and the directional drilling hole is re-constructed to the fracturing target layer. Through the re-constructed directional drilling hole, fracturing is performed on a region of an overlying thick and hard roof of the to-be-bored roadway region (i.e., the region has not been hydraulic-fractured), and so on. The steps of disposing the drilling site, constructing the directional drilling hole(s), and fracturing the directional drilling hole(s) are executed cyclically until tunnel-boring for the roadway is completed, to ensure that the tunnel-boring for the roadway is always performed under the fracturing coverage of the overlying roof. Therefore, the tunnel-boring can be performed after fracturing the overlying thick and hard roof of the to-be-bored roadway in the embodiments of the present disclosure, so that tunneling to build D the working face and using the working face for mining are under the low stress, avoiding the stress concentration which may cause an increase in the risk of the occurrence of the rock burst. In the embodiments of the present disclosure, transformation of the thick and hard roof into a fragmented roof is realized by performing regional fracture on the overlying thick and hard roof of the to-be-bored roadway in the rock burst-prone coal seam in advance, which greatly reduces the stress concentration during the tunnel-boring for the roadway. The roadway can be built successfully in the low stress region of the fracturing coverage, so that tunneling to build the working face and using the working face for mining are both in the protected condition, thus effectively reducing the bursting risk. Finally, it should be noted that the above embodiments are only used to illustrate the technical D solutions of the present disclosure, rather than limit them. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those ordinary skilled in the art understand that within the spirit and principles of the present disclosure, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from protection scope of the present disclosure.
Claims (12)
1. An anti-impact and pressure-relief tunneling method for a rock burst-prone coal seam
roadway, comprising:
determining a fracturing target layer that meets a preset condition for a to-be-bored region of a
coal seam roadway, wherein a directional drilling hole quantity is determined according to a
fracturing target layer quantity;
disposing a drilling site in the coal seam roadway, constructing a directional drilling hole
starting from the drilling site to the fracturing target layer, and fracturing the directional drilling hole
D completed; and
boring the coal seam roadway, and if a remaining length of a fracturing coverage of an overlying
roof is a preset length, re-disposing the drilling site, constructing a directional drilling hole starting
from the re-disposed drilling site to the fracturing target layer, and fracturing the directional drilling
hole completed.
2. The method according to claim 1, wherein determining the fracturing target layer that meets
the preset condition for the to-be-bored region of the coal seam roadway comprises:
determining a rock layer having a thickness greater than a specified thickness and located at a
height within a preset range above the to-be-bored region of the coal seam roadway as the fracturing
target layer according to a drilling column diagram.
D
3. The method according to claim 2, wherein the rock layer with the specified thickness is a
thick and hard sandstone layer with the specified thickness.
4. The method according to claim 2 or 3, wherein a rock layer having a thickness of greater
than 8 m and located at a height within a range of 40 m above a coal seam is determined as the
fracturing target layer for the to-be-bored region of the coal seam roadway according to the drilling
column diagram.
5. The method according to any one of claims 2 to 4, wherein a plurality of the fracturing target
layers exists.
6. The method according to any one of claims 1 to 5, wherein disposing the drilling site in the
coal seam roadway, and constructing the directional drilling hole starting from the drilling site to the
D fracturing target layer comprise:
disposing the drilling site at a position of a preset distance from a to-be-bored roadway in the coal seam roadway according to a height of the fracturing target layer that is a fracturing target layer located at a highest position; constructing the directional drilling hole starting from the drilling site to the fracturing target layer, so that the to-be-bored roadway is located at a horizontal projection region of a horizontal section of the directional drilling hole, wherein one directional drilling hole is correspondingly constructed for one fracturing target layer.
7. The method according to claim 6, wherein a length of the horizontal section of the directional
drilling hole is from 600 to 1000 m. D
8. The method according to any one of claims 1 to 7, wherein at least two directional drilling
holes exist, and steps of disposing the drilling site in the coal seam roadway, constructing the
directional drilling hole starting from the drilling site to the fracturing target layer, and fracturing
the directional drilling hole completed comprise:
disposing the drilling site in the coal seam roadway, and setting a sequence of constructing and
fracturing the directional drilling holes to the fracturing target layers;
constructing a first directional drilling hole starting from the drilling site to a first fracturing
target layer, and fracturing the first directional drilling hole completed; and
constructing a second directional drilling hole starting from the drilling site to a second
fracturing target layer, and fracturing the second directional drilling hole completed until
D constructing and fracturing of the directional drilling holes are completed for all fracturing target
layers.
9. The method according to any one of claims I to 8, wherein fracturing the directional drilling
hole completed comprises:
injecting high-pressure water into the horizontal section of each completed directional drilling
hole in a segmented manner, and performing a hydraulic fracturing on the horizontal section of the
directional drilling hole in the segmented manner.
10. The method according to claim 9, wherein injecting the high-pressure water into the
horizontal section of the completed directional drilling hole in the segmented manner, and
performing the hydraulic fracturing on the horizontal section of the directional drilling hole in the
D segmented manner comprise:
sending a packer into the directional drilling hole at a distance from a hole bottom of the directional drilling hole, injecting the high-pressure water into a hole section sealed by the packer to implement the hydraulic fracturing; and retracting the packer to a next position at a specified distance, and injecting the high-pressure water into a hole section currently sealed by the packer to implement the hydraulic fracturing until the next position to which the packer is retracted exceeds the horizontal section of the directional drilling hole.
11. The method according to claim 10, wherein a length of the hole section to be filled with the high-pressure water is 15 m.
12. The method according to any one of claims 1 to 11, wherein the drilling site is re-disposed
) when the remaining length of the fracturing coverage of the overlying roof is 100 m.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210397287.0 | 2022-04-15 | ||
| CN202210397287.0A CN114856564A (en) | 2022-04-15 | 2022-04-15 | Rock burst coal seam roadway anti-scour pressure-relief tunneling method |
| PCT/CN2022/128958 WO2023197573A1 (en) | 2022-04-15 | 2022-11-01 | Impact-prevention pressure-relief tunneling method for rock burst coal seam roadway |
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| CN114856564A (en) * | 2022-04-15 | 2022-08-05 | 中煤科工开采研究院有限公司 | Rock burst coal seam roadway anti-scour pressure-relief tunneling method |
| CN117189112B (en) * | 2023-11-07 | 2024-01-12 | 中国矿业大学(北京) | System and method for directional drilling and reaming-different Kong Chuzha collaborative hole making and unloading control of residual coal pillar |
| CN117738688B (en) * | 2024-02-20 | 2024-05-14 | 华能煤炭技术研究有限公司 | Quick tunneling method for coal mine tunnel |
| CN118815436A (en) * | 2024-07-04 | 2024-10-22 | 中国矿业大学(北京) | Hydraulic slitting and fracturing to relieve pressure in the key layer of soft coal excavation |
| CN118835999A (en) * | 2024-08-09 | 2024-10-25 | 中煤科工开采研究院有限公司 | Rock burst roadway pressure relief-spraying-anchoring cooperative control method |
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| RU2082886C1 (en) * | 1995-07-28 | 1997-06-27 | Научно-техническая горная ассоциация | Method of weakening of coal seam (versions) |
| RU2396429C1 (en) * | 2009-07-09 | 2010-08-10 | Анатолий Николаевич Осипов | Procedure for weakening marginal massif of mine workings at development of coal beds |
| CN112780340B (en) * | 2021-01-05 | 2023-08-29 | 陕西彬长孟村矿业有限公司 | Method for preventing rock burst in advance in underground coal mine area |
| CN113236360A (en) * | 2021-06-29 | 2021-08-10 | 中煤科工开采研究院有限公司 | Method for preventing and controlling exploding roadway group rock burst |
| CN113914859B (en) * | 2021-09-07 | 2023-12-19 | 中煤科工开采研究院有限公司 | Method for preventing rock burst through fault of coal mine tunneling roadway |
| CN114215530B (en) * | 2021-11-29 | 2024-04-19 | 中国矿业大学 | Rapid roadway digging method for directional hydraulic fracturing gob-side roadway of hard top plate |
| CN114856564A (en) * | 2022-04-15 | 2022-08-05 | 中煤科工开采研究院有限公司 | Rock burst coal seam roadway anti-scour pressure-relief tunneling method |
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