CN108590716A - A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method - Google Patents
A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method Download PDFInfo
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- CN108590716A CN108590716A CN201810348236.2A CN201810348236A CN108590716A CN 108590716 A CN108590716 A CN 108590716A CN 201810348236 A CN201810348236 A CN 201810348236A CN 108590716 A CN108590716 A CN 108590716A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000010276 construction Methods 0.000 title claims abstract description 55
- 238000003325 tomography Methods 0.000 title claims abstract description 33
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 22
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 238000000151 deposition Methods 0.000 claims abstract description 8
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000007569 slipcasting Methods 0.000 claims description 37
- 239000002002 slurry Substances 0.000 claims description 34
- 238000005553 drilling Methods 0.000 claims description 29
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000007582 slurry-cast process Methods 0.000 claims description 10
- 230000002411 adverse Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 230000000903 blocking effect Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 101100194816 Caenorhabditis elegans rig-3 gene Proteins 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006424 Flood reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Rich water tomography tree root type, which is crossed, the invention discloses a kind of tunnel dredges water blockoff integral construction method, by setting position construction main borehole first on the excavation contour line in tunnel, then by design and construction tree root type branch hole in main borehole, ensure that the borehole bottom location of main borehole and tree root type branch hole is fallen in tomography；In the hydrophobic construction stage, using main borehole and tree root type branch hole in communication as weep hole；In the mortar depositing construction stage, using main borehole and tree root type branch hole in communication as injected hole.The present invention has the advantages that a multi-purpose simple and feasible, economic and practical, hole, combining the two ways of dredging and plugging, safe and efficient, quick pass through rich water tomography for tunnel, tunnel etc. are safe and efficient and provides a kind of new method.
Description
Technical field
The present invention relates to a kind of tunnels to cross the thin water blockoff integral construction method of rich water tomography tree root type, is suitable for coal mine, iron
The underground engineerings such as mine, nonferrous metal mine, tunnel, subway are a kind of safe and efficient construction methods for passing through rich water tomography.
Background technology
China is the resources big countries such as coal, iron ore in the world, as china natural resources exploit expanding rapidly and opening for scale
Adopt the increase of depth, the hydraulic pressure that when exploitation is born is increasing, and it is in increase tendency, China's mine to cause down-hole water inrush accident
Well is to be endangered one of the countries with the most serious ... by floods in the world.Fault and broken zone is common in underworkings digging process
Unfavorable geologic body, fault belt be as a low-intensity, that yielding, water penetration is big, water-resistance is poor and water content is big is soft
Weak band exists；Since rich water tomography is aqueous abundant, the underground water in tomography upper lower burrs water-bearing layer can be collected, come with abundant supply
Source can cause tunnel that the disasters such as gushing water or prominent mud, Qing Zheying occurs if not taking specially treated technical measures in roadway excavation
Mine normal production is rung, economic loss is caused；Severe one causes mine partially or fully to be flooded, and extends the mine construction duration or is forced to close
Mine, or even cause great personnel casualty accidents and huge economic loss.Currently, floods, which have become, influences mine safety life
One of significant problem of production, water damage preventing and controlling have become each mining area and ensure the great research topic that safety in production must face
One of.
By long-term mine water management research and field practice, mine is mainly using hydrophobic and grouting for water blocking (at present
Face pre-pouring grout, pre grouting from the working face, tunnel front pre-grouting) etc. two major classes water control technique, successfully solve a large amount of technology
Problem is made that major contribution for containment mine water disaster accident.But China part ore district hydrogeologic is with engineering
Matter condition is extremely complex (water content is big, water recharging is more, hydraulic pressure is high, fault tectonic development), occur mine water disaster accident because
Element is also sufficiently complex, some hydrophobic measures and grouting process etc. are more single or with strong points and poor for applicability at present, in reality
It has some limitations during engineering use, causes mine effect of harnessing the river undesirable；On the other hand, using grouting for water blocking
When need a large amount of drilling of constructing, it is stifled to ensure to be formed after slip casting but due to the complexity at water source and variability in rich water tomography
Water curtain generally requires a large amount of drilling of constructing, and this adds increased quantities and project cost；Also, by existing construction technology water
The construction quality of flat influence, drilling cannot ensure that (degree of skewness is excessive in the construction process for some drillings, it is caused to fall completely
The outside of tomography is without entering the precalculated position in tomography；Some drilling deviation distances are excessive and formed after causing slip casting
Grouting for water blocking fixing collar it is non-intersecting, with the presence of grouting for water blocking blank loophole area, the slip casting for being unfavorable for underground water blocks and filling
Reinforce), cause grouting for water blocking effect poor.Therefore, there is an urgent need for an a kind of simple and feasible, economic and practical, holes of research and development to be mostly used, dredges bridging
It closes, safe and efficient mine is harnessed the river new process.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, a kind of tunnel of present invention offer to cross rich water tomography tree
Root type dredges water blockoff integral construction method, is constructed by the way of multi-purpose, combining the two ways of dredging and plugging using a hole, be it is a kind of it is simple and feasible,
Economic and practical, safe and efficient new method of harnessing the river.
Technical solution：To achieve the above object, the technical solution adopted by the present invention is：
A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method, first on the excavation contour line in tunnel
By setting position construction main borehole, then ensure main borehole and tree root by design and construction tree root type branch hole in main borehole
The borehole bottom location of type branch hole is fallen in tomography；In the hydrophobic construction stage, by main borehole and tree root type branch in communication
Drilling is used as weep hole；In the mortar depositing construction stage, using main borehole and tree root type branch hole in communication as injected hole.
Preferably, after the completion of main borehole is constructed, in main borehole interior installing hole mouth steel pipe, mounting hole steel pipe can play guarantor
The effect protected main borehole, prevent main borehole from caving in, while ensureing the smooth construction of tree root type branch hole.
Preferably, in the hydrophobic construction stage, it is connected to aperture steel pipe and drain pipe using ring flange, while in the steel pipe of aperture
Permeable plug is installed；Underground water flows into hydrophobic tube side-by-side by tree root type branch hole and main borehole and goes out, and permeable plug is hydrophobic to flowing into
The underground water of pipe is filtered, and prevents hydrophobic blockage.
Preferably, in the mortar depositing construction stage, it is connected to aperture steel pipe and high-pressure slip-casting hose using controllable type slurry casting machine, simultaneously
Non-return valve is installed in high-pressure slip-casting hose；The slurries that high-pressure injection pump pumps out inject main borehole and tree by high-pressure slip-casting hose
Root type branch hole；Slurries adverse current is prevented by non-return valve, slurries is avoided to waste；The stream of slurries is controlled by controllable type slurry casting machine
Amount ensures that slurries are surely measured by main borehole and is evenly injected into tree root type branch hole so that slurries are in main borehole and tree root
The grouting for water blocking curtain formed in type branch hole can hand over circle, achieve the purpose that quick water blockoff and country rock carrying.
Preferably, by slip casting recorder record grouting parameter, grouting parameter include slurries pump out pressure, slurries stream
Amount and slip casting time, slip casting recorder can reflect the dynamic change of the mobility status and grouting parameter of slurries in real time, be convenient for and
When adjustment grouting parameter to ensure slip casting effect.
Specifically, rich water tomography tree root type is crossed in the tunnel dredges water blockoff integral construction method, include the following steps：
Step 1：Orientation geological drilling rig is placed in tunnel, drilling rod is mounted on orientation geological drilling rig, orientation is started
Geological drilling rig drives drilling rod high speed rotation, by setting position construction main borehole on the excavation contour line in tunnel；Wait for that main borehole is applied
After the completion of work, in main borehole interior installing hole mouth steel pipe；By design and construction tree root type branch hole in main borehole, ensure main borehole
It is fallen in tomography with the borehole bottom location of tree root type branch hole；
Step 2：Permeable plug is installed in the steel pipe of aperture, aperture steel pipe and drain pipe are connected to using ring flange, by hydrophobic
The underground water for entering tree root type branch hole and main borehole is discharged in the gutter of roadway floor by pipe；Permeable plug can be effectively prevent
The granule mediums such as rubble, sand, mud in tomography are flowed into drain pipe, avoid hydrophobic blockage so that underground water can
In time, smooth, be efficiently flowed into drain pipe, while can also reduce or the pressure of removal underground water (hydrophobic pressure release), profit
In follow-up slip casting；
Step 3：After the completion of the hydrophobic construction stage, the connection of ring flange and aperture steel pipe is released, while being taken out permeable
Plug；It is connected to aperture steel pipe and high-pressure slip-casting hose using controllable type slurry casting machine, while non-return valve being installed in high-pressure slip-casting hose；
The slurries that high-pressure injection pump pumps out quickly are sufficiently injected main borehole and tree root type branch hole by high-pressure slip-casting hose, by inverse
Only valve prevents slurries adverse current, and the flow of slurries is controlled by controllable type slurry casting machine, ensures slurries in main borehole and tree root type branch
It is spread in tree root shape space in drilling, forms grouting for water blocking curtain and carrying reinforcing body, both can avoid slurries in main borehole and tree
Diffusion is uneven and be formed by the non-intersecting problem of grouting for water blocking fixing collar after leading to slip casting in root type branch hole, and can prevent
Lead to water blockoff failure of the slurries in main borehole and tree root type branch hole caused by insufficient infusion because grouting pressure is too small.
Preferably, mortar depositing construction stage, injection slurries are cement class or polyurethane sludge injection material.
Advantageous effect：Tunnel provided by the invention crosses rich water tomography tree root type and dredges water blockoff integral construction method, is suitable for
The underground engineerings such as coal mine, iron ore, nonferrous metal mine, tunnel, subway are a kind of safe and efficient construction parties for passing through rich water tomography
Method, this method is simple and feasible, economic and practical, a hole is multi-purpose, combining the two ways of dredging and plugging, safe and efficient, is that tunnel, tunnel etc. are safe and efficient fast
Speed passes through rich water tomography and provides a kind of new method.
Description of the drawings
Fig. 1 is the position view of main borehole and tree root type branch hole；
Fig. 2 is the construction schematic diagram of main borehole and tree root type branch hole；
Fig. 3 is the construction schematic diagram in hydrophobic stage；
Fig. 4 is the construction schematic diagram in slip casting stage；
Including：The tunnels 1-, 2- excavation contour lines, 3- orient geological drilling rig, 4- drilling rods, 5- main boreholes, 6- tree root types branch
Drilling, the apertures 7- steel pipe, the permeable plugs of 8-, 9- ring flanges, 10- drain pipes, 11- fixing card cables, the gutters 12-, 13- controllable types note
Starch device, 14- non-return valves, 15- high-pressure injection pumps, 16- slip casting recorders, 17- high-pressure slip-casting hoses, 18- tomographies.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method, includes the following steps：
Step 1：Orientation geological drilling rig 3 is placed in tunnel 1, drilling rod 4 is mounted on orientation geological drilling rig 3, is started
It orients geological drilling rig 3 and drives 4 high speed rotation of drilling rod, it is (straight by setting position construction main borehole 5 on the excavation contour line 2 in tunnel 1
Diameter is 120~150mm or so)；After the completion of waiting for that main borehole 5 is constructed, in 5 interior installing hole mouth steel pipe 7 of main borehole；In main borehole 5
By design and construction tree root type branch hole 6, (a diameter of 60~80mm or so is divided into 6~10, symmetrical in tree root shape, edge
It is in spatial spread fault trend), ensure that the borehole bottom location of main borehole 5 and tree root type branch hole 6 is fallen in tomography 18；Construction
Main borehole 5 after the completion and 6 position of tree root type branch hole are as shown in Figure 1, work progress is as shown in Figure 2；
Step 2：As shown in figure 3, in the hydrophobic stage, in aperture, the permeable plug 8 of installation in steel pipe 7, is connected to using ring flange 9
The underground water for entering tree root type branch hole 6 and main borehole 5 is discharged to lane by aperture steel pipe 7 and drain pipe 10 by drain pipe 10
In the gutter 12 of 1 bottom plate of road；The granule mediums such as rubble, sand, the mud that permeable plug 8 can be effectively prevent in tomography 18 are flowed into
In drain pipe 10, drain pipe 10 is avoided to block so that underground water smooth can be efficiently flowed into drain pipe 10, while also can
Enough reductions or the hydrophobic pressure release of pressure of removal underground water, are conducive to follow-up slip casting；
Step 3：After the completion of the hydrophobic construction stage, the connection of ring flange 9 and aperture steel pipe 7 is released, while being taken out permeable
Plug 8；As shown in figure 4, in the slip casting stage, it is connected to aperture steel pipe 7 and high-pressure slip-casting hose 17 using controllable type slurry casting machine 13, simultaneously
Non-return valve 14 is installed in high-pressure slip-casting hose 17；The cement class or polyurethane sludge injection material that high-pressure injection pump 15 pumps out pass through
High-pressure slip-casting hose 17 is quickly sufficiently injected main borehole 5 and tree root type branch hole 6, and slurries adverse current is prevented by non-return valve 14,
The flow of slurries is controlled by controllable type slurry casting machine 13, ensures that slurries are in tree root shape in main borehole 5 and tree root type branch hole 6
Space is spread, and grouting for water blocking curtain and carrying reinforcing body are formed, and both can avoid slurries in main borehole 5 and tree root type branch hole 6
Interior diffusion is uneven and is formed by the non-intersecting problem of grouting for water blocking fixing collar after leading to slip casting, and can prevent because of grouting pressure mistake
It is small and cause slurries in main borehole 5 and tree root type branch hole 6 caused by insufficient infusion water blockoff failure；Slip casting process
In, grouting parameter is recorded by slip casting recorder 16, grouting parameter includes slurries when pumping out pressure, the flow of slurries and slip casting
Between, the dynamic change of the mobility status and grouting parameter of slurries is monitored in real time, convenient for adjustment grouting parameter in time and ensures slip casting
Effect.
In hydrophobic pressure release and during mortar depositing construction, the drilling (main borehole and tree root type branch hole) used of when slip casting with
Drilling used is same drilling when hydrophobic, has achieved the purpose that a hole is mostly used (recycling) and avoids repeating pore-creating, then
Reduce drilling hole amount and saves project cost；The hydrophobic pressure release in tunnel is realized simultaneously and the combination of grouting for water blocking (is dredged
Bridging is closed), it forms tunnel and dredges stifled integrated synthesis and harness the river technology, improve mine and harness the river effect.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：First in tunnel (1)
By setting position construction main borehole (5) on excavation contour line (2), then by design and construction tree root type branch in main borehole (5)
It drills (6), ensures that the borehole bottom location of main borehole (5) and tree root type branch hole (6) is fallen in tomography (18)；In hydrophobic construction rank
Section regard main borehole (5) and tree root type branch hole (6) in communication as weep hole；In the mortar depositing construction stage, by main borehole
(5) and tree root type branch hole (6) in communication is used as injected hole.
2. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
After the completion of main borehole (5) construct, in main borehole (5) interior installing hole mouth steel pipe (7).
3. tunnel according to claim 2 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
In the hydrophobic construction stage, using ring flange (9) connection aperture steel pipe (7) and drain pipe (10), while the peace in aperture steel pipe (7)
Fill permeable plug (8).
4. tunnel according to claim 2 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
In the mortar depositing construction stage, using controllable type slurry casting machine (13) connection aperture steel pipe (7) and high-pressure slip-casting hose (17), while in height
Installation non-return valve (14) in pressure grouting hose (17)；The slurries that high-pressure injection pump (15) pumps out are noted by high-pressure slip-casting hose (17)
Enter main borehole (5) and tree root type branch hole (6), slurries adverse current is prevented by non-return valve (14), passes through controllable type slurry casting machine
(13) flow of slurries is controlled.
5. tunnel according to claim 4 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
Grouting parameter is recorded by slip casting recorder (16), grouting parameter includes slurries when pumping out pressure, the flow of slurries and slip casting
Between.
6. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
Include the following steps：
Step 1：Orientation geological drilling rig (3) is placed in tunnel (1), drilling rod (4) is mounted on orientation geological drilling rig (3),
Start orientation geological drilling rig (3) and drive drilling rod (4) high speed rotation, is applied by setting position on the excavation contour line (2) of tunnel (1)
Work main borehole (5)；After the completion of waiting for main borehole (5) construction, in main borehole (5) interior installing hole mouth steel pipe (7)；In main borehole (5)
By design and construction tree root type branch hole (6), ensure that the borehole bottom location of main borehole (5) and tree root type branch hole (6) is fallen disconnected
In layer (18)；
Step 2：In aperture, the permeable plug (8) of installation in steel pipe (7), uses ring flange (9) connection aperture steel pipe (7) and drain pipe
(10), the underground water for entering tree root type branch hole (6) and main borehole (5) is discharged to by tunnel (1) bottom plate by drain pipe (10)
Gutter (12) in；
Step 3：After the completion of the hydrophobic construction stage, the connection of ring flange (9) and aperture steel pipe (7) is released, while being taken out permeable
It fills in (8)；It is connected to aperture steel pipe (7) and high-pressure slip-casting hose (17) using controllable type slurry casting machine (13), while soft in high-pressure slip-casting
Manage installation non-return valve (14) in (17)；The slurries that high-pressure injection pump (15) pumps out inject main borehole by high-pressure slip-casting hose (17)
(5) and tree root type branch hole (6) slurries adverse current, is prevented by non-return valve (14), passes through controllable type slurry casting machine (13) control slurry
The flow of liquid ensures that slurries are spread in main borehole (5) and tree root type branch hole (6) in tree root shape space, it is stifled to form slip casting
Water curtain and carrying reinforcing body.
7. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：
Mortar depositing construction stage, injection slurries are cement class or polyurethane sludge injection material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810348236.2A CN108590716A (en) | 2018-04-18 | 2018-04-18 | A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method |
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| CN201810348236.2A CN108590716A (en) | 2018-04-18 | 2018-04-18 | A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method |
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Cited By (4)
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| CN110273708A (en) * | 2019-07-01 | 2019-09-24 | 长沙矿山研究院有限责任公司 | A kind of hydrophobic method of roadway support structural body control |
| CN110486049A (en) * | 2019-08-29 | 2019-11-22 | 龙口矿业集团有限公司 | A kind of rich water sandstone tunnel passing fault crushed zone comprehensive processing method |
| CN113153309A (en) * | 2021-03-09 | 2021-07-23 | 中铁工程装备集团有限公司 | Tunnel construction method |
| CN117780354A (en) * | 2024-02-28 | 2024-03-29 | 安徽建筑大学 | Method for reinforcing bottom of shaft of coal mine vertical shaft to be built by thick loose layer thin bedrock by sparse-filling |
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