CN208918508U - A kind of surface drilling to coal seam breaking roof grouting and reinforcing grouting device - Google Patents
A kind of surface drilling to coal seam breaking roof grouting and reinforcing grouting device Download PDFInfo
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- CN208918508U CN208918508U CN201821517436.8U CN201821517436U CN208918508U CN 208918508 U CN208918508 U CN 208918508U CN 201821517436 U CN201821517436 U CN 201821517436U CN 208918508 U CN208918508 U CN 208918508U
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Abstract
The utility model provides a kind of surface drilling to the grouting device of coal seam breaking roof grouting and reinforcing, and grouting device includes: storage tank, suction tube, slurry mixing device, mixture conveying pipeline, high-pressure injection pump, high pressure feed pipe for mortar, high pressure slurry injection rifle；Suction tube is separately connected the discharge end of storage tank and the feed end of slurry mixing device, slurry mixing device includes two metering pumps and agitating device, mixture conveying pipeline connects slurry mixing device and high-pressure injection pump, high pressure feed pipe for mortar connects high-pressure injection pump and high pressure slurry injection rifle, to realize slurry sucking-entire slip casting process of mixing-pressurization-slip casting；Grouting device configuration provided by the utility model is reasonable, grouting serous fluid proportion is accurate uniform, pressure is stably and controllable, operating space is larger, it does not need to exclusively carry out sealing of hole, the technical difficulty of bored grouting is reduced, slip casting diffusion zone is big, substantially increases special thick, thick coal seam breaking roof integral strength.
Description
Technical field
The utility model belongs to the field of coal seam breaking roof grouting and reinforcing, and in particular to a kind of surface drilling is special to coal seam
The grouting device of thick breaking roof grouting and reinforcing.
Background technique
There is thicker direct top above China's Part Coal Mine working face, top plate is easily broken, mainly there is depth of stratum
Greatly, the features such as rock strength is low, cranny development is at degree height, globality poor, low self-stable ability, leads to working face top in recovery process
There is inbreak phenomenon in plate and back, and coal wall caving, top plate leakage top, roof fall, the safety such as Shield Powered Support occurs in trigonum
Hidden danger.Causing the principal element of this phenomenon to have, roof strata own physical mechanical property is poor, working face mining disturbs repeatedly, office
The factors such as cage structure.
Working face breaking roof allows the exposed time short, and exposed area is smaller, will if cannot get immediate support and control
The useful event of leakage occurs, and leaking top range will be increasing.Breaking roof occurs to leak the type accident that collapses in order to prevent, need to locally occur
With regard to being controlled in advance before leakage top.
Conventional art is mainly using reinforcing geological prospecting, reinforce construction management, advance support, shift to an earlier date supporting, lane at construction
The methods of bored grouting carries out the supporting and control of breaking roof at road, but breaking roof can not obtain fully effective control
It is general using bottom hole slip casting effect when system, especially working face have thicker easily broken top plate, firstly, frangible top plate
Thickness is larger, and project amount is larger；Secondly, underground boring construction angle limit is larger, drilling is extremely difficult to the requirement of design, causes
Slip casting effect is poor；Finally, underground top plate bored grouting range is small, sealing of hole difficulty is big, slurries easily outflow, slip casting effect is poor.
Accordingly, it is desirable to provide a kind of be directed to the insufficient improved technology scheme of the above-mentioned prior art.
Utility model content
The purpose of this utility model is to provide a kind of surface drilling to the grouting device of coal seam breaking roof grouting and reinforcing,
Larger at least to solve current top plate drilling construction angle limitation, range of grouting is small, and sealing of hole difficulty is big, and slurries easily outflow, slip casting
The problems such as effect is poor.
To achieve the above object, the utility model provides the following technical solutions:
To the grouting device of coal seam breaking roof grouting and reinforcing, grouting device includes: for a kind of surface drilling
Storage tank, for storage tank for storing grouting serous fluid raw material, storage tank includes storage tank A and storage tank B；
Suction tube, suction tube include suction tube A and suction tube B, the feed end of suction tube A and suction tube B respectively with storing
Tank A is connected to the discharge end of storage tank B, the discharge end of suction tube A and suction tube B respectively with the feed end phase of slurry mixing device
Connection；
Slurry mixing device, slurry mixing device includes charging absorption pump and agitating device, for drawing slurry and being stirred,
The discharge end of slurry mixing device is connected with the feed end of mixture conveying pipeline；
Mixture conveying pipeline, the discharge end of mixture conveying pipeline are connected with the input terminal of high-pressure injection pump；
The output end of high-pressure injection pump, high-pressure injection pump is connected with the feed end of high pressure feed pipe for mortar；
The discharge end of high pressure feed pipe for mortar, high pressure feed pipe for mortar is connected with the feed end of high pressure slurry injection rifle；
The dispensing end of high pressure slurry injection rifle, high pressure slurry injection rifle is cone shape, convenient for being put into deep hole, high pressure slurries
Filling gun gun barrel is cylindrical, is provided with fluid hole on high pressure slurry injection gun barrel wall.
Grouting device as described above, it is preferable that charging absorption pump includes charging absorption pump A and charging absorption pump B, the charging absorption pump A and suction
Pump B is connected with the discharge end of suction tube A and suction tube B respectively.
Grouting device as described above, it is preferable that charging absorption pump A and charging absorption pump B is metering pump, can be precisely controlled suction
Flow, the convenient volume ratio for accurately controlling two kinds of slurries in the agitating device.
Grouting device as described above, it is preferable that the pressure gauge for observing grouting pressure is additionally provided on high pressure feed pipe for mortar
With the flowmeter for observing flow rate of grouting.
Grouting device as described above, it is preferable that high pressure slurry injection rifle includes connector, slip casting cylinder and coniform closing
Head.
Grouting device as described above, it is preferable that slip casting cylinder diameter, length, slip casting hole density are provided with more set specifications, high pressure
Slurry injection gun joint size constancy, convenient for being connected with high pressure feed pipe for mortar discharge end.
Grouting device as described above, it is preferable that the gun barrel outer diameter of high pressure slurry injection rifle is not less than the high pressure feed pipe for mortar
Outer diameter.
Grouting device as described above, it is preferable that the discharge end of suction tube A and suction tube B respectively with triple valve A and triple valve
The feed end of B is connected, and the discharge end of triple valve A and triple valve B are connected with the input terminal of charging absorption pump A and charging absorption pump B respectively；
The commutation mouth of triple valve A and triple valve B is connected with the discharge end for rinsing oil pipe A and flushing oil pipe B respectively；Rinse oil pipe A and
The feed end for rinsing oil pipe B is connected with the discharge port for rinsing batch can respectively；Triple valve A and triple valve B is converging three-way valve.
Compared with the immediate prior art, technical solution provided by the utility model has following excellent effect:
In technical solution provided by the utility model, after surface drilling to coal seam breaking roof grouting and reinforcing,
The mechanical characteristic of breaking roof rock stratum plane of weakness is effectively improved, and by sufficient slip casting, makes rock stratum crack itself and interlayer
Internal friction angle and cohesive strength also significantly improve；Compared with down-hole drilling slip casting, the purpose of surface drilling mortar depositing construction is strong, and operation is empty
Between it is larger, constructing operation is convenient, and once grouting diffusion zone is big, does not need to exclusively carry out sealing of hole, reduces the skill of bored grouting
Art difficulty, rationally, uniformly, pressure is stably and controllable, and slip casting effect effectively improves, greatly for grouting serous fluid proportion for grouting equipment configuration
The integral strength of coal seam breaking roof is improved greatly, and reduces certain workload；To special thick, thick coal seam breaking roof
It is reinforced with significant progress effect.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical
Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
Wherein:
Fig. 1 is the high-pressure slip-casting apparatus structure schematic diagram of the utility model specific embodiment；
Fig. 2 is the high pressure slurry injection rifle structural schematic diagram of the utility model specific embodiment；
Fig. 3 is the Seam Roof And Floor schematic diagram of the utility model specific embodiment；
Fig. 4 is surface drilling arrangement schematic diagram；
Fig. 5 is the flow chart of the grouting method of the utility model specific embodiment；
Fig. 6 is the specific flow chart of the step S1 of Fig. 5；
Fig. 7 is the specific course diagram of the step S2 of Fig. 5.
In figure: 1, storage tank A；2, storage tank B；3, suction tube A；4, suction tube B；5, slurry mixing device；6, mixture
Conveying pipeline；7, high-pressure injection pump；8, high pressure feed pipe for mortar；9, high pressure slurry injection rifle；10, high pressure slurry injection rifle fluid hole；11,
Surface drilling；12, topsoil；13, coal seam top rock stratum；14, roof cracking rock stratum；15, coal seam；16, oil pipe A is rinsed；17, it rushes
Washing oil pipe B；18, batch can is rinsed.
Specific embodiment
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that not conflicting
In the case where, the features in the embodiments and the embodiments of the present application can be combined with each other.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the utility model rather than requires the utility model that must be constructed and operated in a specific orientation, therefore
It should not be understood as the limitation to utility model.Term used in the utility model " connected ", " connection " shall be understood in a broad sense, example
Such as, it may be a fixed connection, may be a detachable connection；It can be directly connected, the indirect phase of intermediate member can also be passed through
Even, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Embodiment according to the present utility model, as shown in Figure 1, a kind of surface drilling is to coal seam breaking roof grouting and reinforcing
Grouting device, grouting and reinforcing device include: storage tank, suction tube, rinse oil pipe, rinse batch can 18, slurry mixing device 5, mix
Close material conveying pipeline 6, high-pressure injection pump 7, high pressure feed pipe for mortar 8, high pressure slurry injection rifle 9.
Storage tank, for storage tank for storing grouting serous fluid raw material, storage tank includes storage tank A1 and storage tank B2；Storage tank
A1 and storage tank B2 is respectively used to the material of injecting paste material Ma Lisan A used by holding the present embodiment and Ma Lisan B material.
Suction tube, suction tube include suction tube A3 and suction tube B4, the feed end of suction tube A3 and suction tube B4 respectively with
Storage tank A1 is connected with the discharge end of storage tank B2；The discharge end of suction tube A3 and suction tube B4 respectively with triple valve A and three
The feed inlet of port valve B is connected；The commutation mouth of triple valve A and triple valve B is respectively with flushing oil pipe A16's and flushing oil pipe B17
Discharge end is connected, and the feed end for rinsing oil pipe A16 and flushing oil pipe B17 is connected with the discharge port for rinsing batch can 18 respectively；
The discharge port of triple valve A and triple valve B are connected with the feed inlet of charging absorption pump A and charging absorption pump B respectively；Pass through two interflow threeways
Valve can switch sucking material, realize that slip casting suction process and flushing oil suction switch at any time.
Slurry mixing device 5, slurry mixing device 5 includes charging absorption pump and agitating device, for drawing slurry simultaneously in proportion
Slurry is thoroughly mixed, the feed end of slurry mixing device 5 is connected with the discharge end of suction tube A3 and suction tube B4, slurry
The feed end of material mixing arrangement 5 is connected with the feed end of mixture conveying pipeline 6；The charging absorption pump of slurry mixing device 5 uses two
The metering pump of a same model is charging absorption pump A and charging absorption pump B respectively, and metering pump is not influenced by pressure in mixing arrangement, can
It is precisely controlled the flow for drawing slurry, is conveniently precisely controlled the volume ratio of two kinds of slurries in the agitating device.
The discharge end of mixture conveying pipeline 6, mixture conveying pipeline 6 is connected with the input terminal of high-pressure injection pump 7.
The output end of high-pressure injection pump 7, high-pressure injection pump 7 is connected with the feed end of high pressure feed pipe for mortar 8.
The discharge end of high pressure feed pipe for mortar 8, high pressure feed pipe for mortar 8 is connected with high pressure slurry injection rifle 9；Slip casting in order to facilitate observation of
Pressure and flow rate of grouting are provided with pressure gauge and flowmeter on high-pressure slip-casting pipe.
High pressure slurry injection rifle 9,9 one end of high pressure slurry injection rifle are connected with the high-pressure slip-casting pipe, high pressure slurries note
Penetrating 9 other end of rifle is in conical closed, is conveniently put into deep hole, and high pressure slurry injection 9 gun barrels of rifle are cylindrical, high pressure slurries note
It penetrates on 9 tube wall of rifle and is evenly equipped with injected hole.High pressure slurry injection 9 joint dimensions of rifle are constant, convenient for connection high pressure feed pipe for mortar 8.For with
The difference of different geological conditions and bore diameter is closed, 9 diameter of high pressure slurry injection rifle has 120mm, 200mm, 300mm, high mud jacking
The length of liquid filling gun 9 is equal to breaking roof thickness and subtracts grout spreading range γ.
Wherein, high-pressure injection rifle gun barrel outer diameter is not less than the outer diameter of the high pressure feed pipe for mortar 8.
Embodiment according to the present utility model, as shown in Fig. 5, Fig. 6 and Fig. 7, the utility model additionally provides surface drilling
11 to 15 breaking roof grouting and reinforcing of coal seam method, slip casting processing method includes the following steps:
S1 successively drills according to face roof and surface state:
The top plate thickness of 15 top plate of sampling and testing coal seam, grout spreading range γ, crack rate n and slurries having in crack
Imitate volumetric efficiency β；It is crushed situation according to face roof, determines the density to drill and arrangement and bore diameter size；It bores
The arrangement of hole density is according to depending on grout spreading range γ, it is ensured that slurries just may be implemented in the drill hole density of arrangement after slip casting
All standing to 15 breaking roof of coal seam, bore diameter have tri- kinds of sizes of 120mm, 200mm, 300mm selective, preferably 120mm；
9 diameter of high pressure slurry injection rifle, the selection of bore diameter and the relationship of crack rate n see the table below 1:
1 high pressure slurry injection rifle diameter of table, the selection of bore diameter and the relation table of crack rate n
Crack rate n is higher, illustrates that roof cracking degree is higher, when drilling in this way at breaking roof, the easier quilt in hole
It destroys, therefore selects biggish bore diameter；Crack rate n is lower, illustrates that roof cracking degree is lower, the stability of country rock is got over
It is good, it drills also more stable, common bore size 120mm can be selected.
According to the height above sea level at the height above sea level of 15 breaking roof of working face coal seam and occurrence and surface drilling 11, really
The depth of each fixed surface drilling 11；Survey calculation goes out at bottom surface and the surface drilling 11 of 15 breaking roof of working face coal seam
Altitude difference, difference subtract grout spreading range γ at this, are the depth to drill at this.
As shown in Figure 3, Figure 4, it according to the direction of propulsion of working face, successively drills by row, the drill bit warp of drilling device
Topsoil 12, coal seam top rock stratum 13 are sequentially passed through downwards with crossing, reach the roof cracking rock stratum 14 of 15 top of coal seam, until
Up to after drilling depth, stop drilling, extract drilling tool out, one borehole operation is completed.
Next drilling is successively carried out according to same operating procedure.
S2 chooses injecting paste material, determines grouting parameter, installs grouting device
Ma Lisan liquid macroimolecule resin material is chosen as injecting paste material, wherein A material and B material are matched by volume 1: 1
Than；In the present embodiment, A material selects resin, and B material selects catalyst.Resin mixed with catalyst together with when react generation
Expansion generates polynary netted close elastomer, and when it is pushed by high pressure, being injected into breaking roof gap (can under high pressure effect
So that the closure crack of coal rock layer is opened), it can extend along breaking roof gap and (including visually be difficult to perceive until by all cracks
Crack and the crack opened again under high pressure effect) filling.In the present embodiment, there is no successively suitable for the selection of A material and B material
Sequence, can also A material select catalyst, B material select resin.
Determine grouting pressure and grouting serous fluid amount Q；
Grouting pressure has a part variation according to the difference of 15 Roof rock feature of different coal, and grouting pressure selection range 5~
The dosage Q of 8MPa, grouting serous fluid are calculated according to grout spreading range γ and crack rate n,
Q=2 π γ Hn β
In formula: Q- slurries injection rate；
γ-grout spreading range；
H- slip casting segment length；
N- crack rate；
Effective volumetric efficiency (value range 0.3~0.9 of β) of the β-slurries in crack；
Malisan material is prepared enough according to slip casting dosage Q, installation grouting device prepares slip casting.
S3 successively carries out slip casting:
Firstly, the high pressure slurry injection rifle 9 for choosing suitable dimension is connect with high pressure feed pipe for mortar 8, and it is put into drilling and send to note
Starch position；Secondly, revolving and passing to suction tube A3 and suction tube B4 triple valve A and triple valve B valve respectively；Again, suction is adjusted
Pump A and charging absorption pump B keep its flow identical, open slurry mixing device 5 switch, draw slurry and be uniformly mixed be delivered to high pressure injection
At stock pump 7；Then, it opens high-pressure injection pump 7 and carries out slip casting, pressure gauge on moment concern high pressure feed pipe for mortar 8 during slip casting
The flow of pressure and flowmeter continues to stablize 10~20min of slip casting when flow is less than 5L/min, when pressure is stablized higher
Stop slip casting when grouting pressure 8MPa or so, filling gun is extracted out and is drilled；Finally, rinsing grouting pipeline: this bored grouting terminates
Afterwards, triple valve A and triple valve B are switched to immediately and rinse oil pipe A16 and rinses oil pipe B17, flushing lubricating oil is made to pass through punching
It washes batch can 18 and is inhaled into grouting pipeline, detergent line, in case mixed serum solidifies in pipeline；This hole slip casting is completed, and is carried out down
The slip casting in one hole.
In conclusion the utility model also has following advantageous effects:
In technical solution provided by the utility model, after surface drilling to coal seam breaking roof grouting and reinforcing,
The mechanical characteristic of breaking roof rock stratum plane of weakness is effectively improved, its integral strength is improved, and makes rock stratum crack itself and interlayer
Internal friction angle and cohesive strength also significantly improve；Compared with down-hole drilling slip casting, the purpose of surface drilling mortar depositing construction is strong, operation
Space is larger, and constructing operation is convenient, and once grouting diffusion zone is big, does not need to exclusively carry out sealing of hole, reduces bored grouting
Technical difficulty, rationally, grouting serous fluid proportion is precisely uniform, and pressure is stably and controllable, and slip casting effect obtains effectively for grouting equipment configuration
It improves, substantially increases the integral strength of coal seam breaking roof, and reduce certain workload.Substantially increase it is special thick, compared with
The consolidation effect of high seam breaking roof.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of surface drilling is to the grouting device of coal seam breaking roof grouting and reinforcing, which is characterized in that the grouting device packet
It includes:
Storage tank, for the storage tank for storing grouting serous fluid raw material, the storage tank includes storage tank A and storage tank B；
Suction tube, the suction tube include suction tube A and suction tube B, the suction tube A and suction tube B feed end respectively with
Storage tank A is connected to the discharge end of storage tank B, the discharge end of the suction tube A and suction tube B respectively with slurry mixing device
Feed end is connected；
Slurry mixing device, the slurry mixing device includes charging absorption pump and agitating device, for drawing slurry and being stirred,
The discharge end of the slurry mixing device is connected with the feed end of mixture conveying pipeline；
The discharge end of mixture conveying pipeline, the mixture conveying pipeline is connected with the input terminal of high-pressure injection pump；
The output end of high-pressure injection pump, the high-pressure injection pump is connected with the feed end of high pressure feed pipe for mortar；
The discharge end of high pressure feed pipe for mortar, the high pressure feed pipe for mortar is connected with the feed end of high pressure slurry injection rifle；
The dispensing end of high pressure slurry injection rifle, the high pressure slurry injection rifle is cone shape, convenient for being put into deep hole, the high pressure
Slurry injection rifle gun barrel is cylindrical, is provided with fluid hole on the high pressure slurry injection gun barrel wall.
2. a kind of surface drilling as described in claim 1 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In, the charging absorption pump include charging absorption pump A and charging absorption pump B, the charging absorption pump A and charging absorption pump B respectively with suction tube A and suction tube B
Discharge end be connected.
3. a kind of surface drilling as claimed in claim 2 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In the charging absorption pump A and charging absorption pump B are metering pump, can be precisely controlled the flow of suction, convenient accurately to control the stirring
The volume ratio of two kinds of slurries in device.
4. a kind of surface drilling as described in claim 1 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In being additionally provided with the pressure gauge for observing grouting pressure and the flow for observing flow rate of grouting on the high pressure feed pipe for mortar
Meter.
5. a kind of surface drilling as described in claim 1 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In the high pressure slurry injection rifle includes connector, slip casting cylinder and coniform closed head.
6. a kind of surface drilling as claimed in claim 5 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In the slip casting cylinder diameter, length, slip casting hole density are provided with more set specifications, and the high pressure slurry injection gun joint size is not
Become, convenient for being connected with high pressure feed pipe for mortar discharge end.
7. a kind of surface drilling as claimed in claim 5 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In the gun barrel outer diameter of the high pressure slurry injection rifle is not less than the outer diameter of the high pressure feed pipe for mortar.
8. a kind of surface drilling as claimed in claim 2 to the grouting device of coal seam breaking roof grouting and reinforcing, feature exists
In the discharge end of the suction tube A and suction tube B are connected with the feed end of triple valve A and triple valve B respectively, the threeway
The discharge end of valve A and triple valve B are connected with the input terminal of charging absorption pump A and charging absorption pump B respectively；The triple valve A and triple valve B
Commutation mouth respectively with rinse oil pipe A and flushing oil pipe B discharge end be connected；It is described rinse oil pipe A and rinse oil pipe B into
Material end is connected with the discharge port for rinsing batch can respectively；The triple valve A and triple valve B is converging three-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821517436.8U CN208918508U (en) | 2018-09-01 | 2018-09-01 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing grouting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821517436.8U CN208918508U (en) | 2018-09-01 | 2018-09-01 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing grouting device |
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| Publication Number | Publication Date |
|---|---|
| CN208918508U true CN208918508U (en) | 2019-05-31 |
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ID=66705847
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821517436.8U Expired - Fee Related CN208918508U (en) | 2018-09-01 | 2018-09-01 | A kind of surface drilling to coal seam breaking roof grouting and reinforcing grouting device |
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| Country | Link |
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| CN (1) | CN208918508U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832767A (en) * | 2021-01-05 | 2021-05-25 | 河南理工大学 | Coal seam roof reinforcing apparatus based on high pressure gas-solid mixture is filled |
| CN113482664A (en) * | 2021-08-17 | 2021-10-08 | 华能铜川照金煤电有限公司西川煤矿分公司 | Pressure concentration area surrounding rock grouting reinforcement method |
-
2018
- 2018-09-01 CN CN201821517436.8U patent/CN208918508U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832767A (en) * | 2021-01-05 | 2021-05-25 | 河南理工大学 | Coal seam roof reinforcing apparatus based on high pressure gas-solid mixture is filled |
| CN113482664A (en) * | 2021-08-17 | 2021-10-08 | 华能铜川照金煤电有限公司西川煤矿分公司 | Pressure concentration area surrounding rock grouting reinforcement method |
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