CN106593300A - Thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole - Google Patents
Thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole Download PDFInfo
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- CN106593300A CN106593300A CN201611094032.8A CN201611094032A CN106593300A CN 106593300 A CN106593300 A CN 106593300A CN 201611094032 A CN201611094032 A CN 201611094032A CN 106593300 A CN106593300 A CN 106593300A
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- 238000005553 drilling Methods 0.000 title claims abstract description 35
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 30
- 239000006028 limestone Substances 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 19
- 239000002956 ash Substances 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 238000005065 mining Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000011435 rock Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000010881 fly ash Substances 0.000 abstract 1
- 238000007569 slipcasting Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 10
- 238000003325 tomography Methods 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
Classifications
-
- 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
- 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
- E21B7/046—Directional drilling horizontal drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole. The thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole comprises a ground main hole. The ground main hole vertically extends to the underground, penetrates through a vertically-drilled straight hole section of a base rock layer from the ground to the underground and downwards penetrates through an ash consequently-drilled bedding section along a coal bed. A kickoff point is arranged at the end, away from the ground and close to the coal bed, of the straight hole section. Inclined drilling is conducted between the kickoff point and the middle of lime-cement-flyash below the coal bed, so that a directional inclination guide section is formed. The two ends of the directional inclination guide section communicate with the straight hole section and the bedding section correspondingly. The main hole bedding section is divided into a plurality of first and second stage branch holes distributed in a fan shape in the approximately horizontal direction of the bedding section. By adopting the technical scheme, compared with the former conventional water control technology, the safe reliability is greatly improved, deep mining bottom plate limestone water disaster governance is achieved, bottom plate water disaster accidents are avoided, and safety production is ensured.
Description
Technical field
The invention belongs to coal mining field, it is more particularly related to a kind of thin layer limestone surface orientation drilling
Horizontal multilevel branch inlet well.
Background technology
It is pilot production that prior art typically prevents and treats the method for water damage, different for the hydrogeologic condition of single work surface, point
Not Xuan Yong " Draining hook, pressure limiting exploitation ", " water-filling utilizes water barrier mining under safe waterpressure of aquifer ", " floor grouting strengthening reconstruction resistance to compression is opened
Adopt ", " Draining hook in combination with grouting and reinforcing comprehensive resistance to compression exploitation ", " the comprehensive grouting and reinforcing transformation resistance to compression exploitation of base plate " etc. it is many
Planting anti-method mode of harnessing the river carries out pilot production test, but, as mining depth of coal seams is increased, aqueous group of too grey karst is aqueous by force with ash difficult to understand
Layer watery is strong, hydraulic pressure is high, and vertical strong runoff zones such as Genesis of Karst Subsided Column, fault belt are difficult to investigate thoroughly, in mining Practice,
Even if implementation face Full-face pouring strengthening reconstruction is also difficult to effectively prevent and treat base plate karstic water flooding, mistake of the base plate karst in exploitation
Cheng Zhong, once there is water leak accident, then causes work surface to stop production comprehensively.
The content of the invention
The technical problem to be solved is to provide a kind of thin layer for avoiding the permeable guarantee of base plate karst from keeping the safety in production
Limestone surface orientation creeps into horizontal multilevel branch inlet well.
To achieve these goals, the technical scheme taken of the present invention is：A kind of thin layer limestone surface orientation for being provided
Horizontal multilevel branch inlet well, including ground main aperture are crept into, described ground main aperture vertically extends to underground, from ground to ground
Under the straight hole section vertically bored through horizon d and the concordant section forward got out through an ash under coal seam, straight hole section is away from ground
One end arranges kickoff point (KOP) at coal seam, and the middle part inclined drilling of three ashes forms orientation leads-slanting section, orientation under kickoff point (KOP) to coal seam
The two ends of leads-slanting section respectively with straight hole section and concordant section UNICOM, wherein main aperture concordant section separates multiple in sector along the nearly level of concordant
The I and II branched hole of distribution.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, one-level branched hole
One end is located at main aperture concordant section, and the other end forward extends under coal seam through the nearly level of an ash, and the line of elongated end is sector.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, one-level branch nose end
Spacing≤2 times sector the radius in portion, is 50～120m.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, one-level branch nose end
The spacing in portion preferably 60～80m.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, two grades of branched holes from
Its affiliated one-level branched hole forward extends away from the nearly level in end of main aperture one end, and the line of elongated end is sector.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, two grades of branch's nose ends
Spacing≤2 times sector the radius in portion, is 50～120m.
A kind of thin layer limestone surface orientation disclosed by the invention creeps into horizontal multilevel branch inlet well, two grades of branch's nose ends
The spacing in portion preferably 60～80m.
The exploration engineering amount of prior art exploration means and its input, it is difficult to accurately find with positioning seat earth to thin ash
Rock, ash water filling source difficult to understand, especially in the mine that there is the vertical strong runoff zones such as hidden danger such as karst collapse col umn, structurally fractured zone, too
Buck is contacted with Ordovician karst water presence, adopts deep increasing in mine, when hydraulic pressure constantly increases, easily there is what Ordovician karst water was participated in
Mines water inrush accident, causes mine disaster and heavy losses, using technical scheme, routinely notes from conventional down-hole
The grouting pressure of slurry is low, the little grouting pressure for developing into the drilling slip casting of surface orientation concordant of range of scatter is big, can fracture grouting, expand
The wide advanced region in scattered region is harnessed the river method；In surface orientation concordant drilling Grouting engineering, each slip casting main aperture has multiple suitable
Layer branched hole, drill after into destination layer with " band, plumage, netted " drilling track detect it is latent sunken in destination layer in the range of brills
Fall post, tomography and fissure zone etc., nearby whether there is with the drilling of grouting amount speculative arbitration according to drilling serosity wastage and such as subsides
The buried structures such as post, tomography；Change grouting pressure by adjustment carries out slip casting with injecting paste material, so as to effective sealing region internal memory
Latent vertical permeable structure body and each water-bearing layer of coal measures feed channel；On the other hand, it is high by multiple concordant branched holes
Pressure grouting, expands drilling span of control, the grout transformation effect of target zone is improved, so as to transform water-bearing layer as effective water proof
Layer；Shown with actual mining practice by 5 actual drivings of work surface：Thin layer limestone drilling in down-hole after the drilling slip casting of surface orientation concordant
Anhydrous rate reaches 80～90%, only minority drilling water outlet and maximum single hole water outlet is respectively less than 6m3/ h, working face extraction water yield is little
In 10m3/ h, above-mentioned statistical number to thin limestone using this kind of drilling it was demonstrated that carry out high-pressure slip-casting, it is possible to achieve controls in advanced region
Reason, compared with conventional water control technique, security reliability is greatly improved, and is realized deep mining base plate limestone water damage and is controlled
Reason, it is to avoid base plate karst water leak accident occurs to ensure safety in production.
Below with reference to drawings and Examples, the present invention is described in detail.
Description of the drawings
The content and the labelling in figure expressed by each width accompanying drawing of this specification is briefly described below：
Fig. 1 is a kind of design sketch of the horizontal multilevel branch inlet well of thin layer limestone surface orientation drilling of the invention.
Fig. 2 is that a kind of thin layer limestone surface orientation of invention shown in Fig. 1 creeps into D2 notes in horizontal multilevel branch inlet well
The design sketch of slurry bored grouting coverage.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, each structure for example involved to the specific embodiment of the present invention
The shape of part, the mutual alignment between construction, each several part and annexation, the effect of each several part and operation principle, manufacturing process
And operate with method etc., be described in further detail, with help those skilled in the art to the inventive concept of the present invention,
Technical scheme has more complete, accurate and deep understanding.
A kind of thin layer limestone surface orientation of the present invention creeps into horizontal multilevel branch inlet well, including ground main aperture, described
Ground main aperture vertically extend to underground, straight hole section from ground to underground that vertically bore through horizon d from and pass through one under coal seam
The concordant section that ash forward gets out, straight hole section arranges kickoff point (KOP) away from the one end on ground at coal seam, three under kickoff point (KOP) to coal seam
The middle part inclined drilling of ash forms orientation leads-slanting section, orient the two ends of leads-slanting section respectively with straight hole section and concordant section UNICOM, wherein
Main aperture concordant section separates multiple I and II branched holes in fan-shaped distribution along the nearly level of concordant；One end of one-level branched hole is located at
Main aperture concordant section, the other end forward extends under coal seam through the nearly level of an ash, and the line of elongated end is sector；One-level branched hole
Spacing≤2 times sector the radius of end, is 50～120m；The spacing preferably 60～80m of one-level branch bore ends.
End nearly level of two grades of branched holes from its affiliated one-level branched hole away from main aperture one end forward extends, elongated end
Line is sector；Spacing≤2 times sector the radius of two grades of branch's bore ends, is 50～120m；The spacing of two grades of branch's bore ends
It is preferred that 60～80m.
Fig. 1 is a kind of design sketch of the horizontal multilevel branch inlet well of thin layer limestone surface orientation drilling of the invention；Exploiting field
Successively construct five units of D1, D2, D3, D4 and D5.
Slip casting coverage is verified：
By taking D2 holes as an example, after D2 bored groutings terminate, D2-1 drillings of and then constructing, as drilling starts in rock from 780m
Find to there is cement block in bits, the distance about 60m of the position of cement block away from main aperture, creeping into 1000m or so still has cement block
Presence, and now the distance away from main aperture more than 120m, D2-6, to 607～880m sections, there is also cement block in drilling, and be somebody's turn to do
The presence of cement block has confirmed the coverage of D2 bored groutings up to 60～120m, it was demonstrated that I and II branch bore ends
Spacing is 50～120m；DF7 shear-zones are not missed in D2-1 and D2-7 branched hole drilling process, apart from D2 main apertures about 144m；D5-
1 hole is not missed through tomography, with D2 main apertures distance about 168m；DF5 shear-zones are not missed in D2-6 branched hole drilling process, distance
D2 main apertures about 94m；By statistics can obtain, D2 drill III 634, III 636 work surfaces slip casting coverage averagely 60
～80m, it was demonstrated that the spacing preferably 60～80m of I and II branch bore ends.
Using technical scheme, from the grouting pressure of conventional down-hole routine slip casting it is low, range of scatter is little develops into
The grouting pressure of surface orientation concordant drilling slip casting is big, can the wide advanced region of fracture grouting, diffusion zone harness the river method；On ground
In the orientation concordant drilling Grouting engineering of face, each slip casting main aperture has multiple concordant branched holes, drill after into destination layer with
" band, plumage, netted " drilling track detect bore in the range of hidden karst pillar, tomography and fissure zone etc. in destination layer, according to drilling
Serosity wastage is with the drilling of grouting amount speculative arbitration nearby with the presence or absence of such as karst collapse col umn, tomography buried structure；Changed by adjustment
Become grouting pressure carries out slip casting with injecting paste material, so as to the latent vertical permeable structure body and coal measures of presence in effective sealing region
The feed channel in each water-bearing layer；On the other hand, by multiple concordant branched hole high-pressure slip-castings, expand drilling span of control, improve
The grout transformation effect of target zone, so as to transform water-bearing layer as effective water barrier；I and II branched hole of the present invention is near along concordant
Horizontally disposed, it is ensured that drilling horizontal section track wide-angle of trying one's best intersect with tomography and fold axle portion crack, acquisition is more preferably during slip casting
Dilation angle；The I and II branched hole of one borehole of the present invention interts multiple structural surfaces along concordant, and grouting and reinforcing reaches
To the preferable plugging effect of crack in layer.
Shown with actual mining practice by 5 actual drivings of work surface：Down-hole thin layer ash after the drilling slip casting of surface orientation concordant
Drill anhydrous rate of rock reaches 80～90%, only minority drilling water outlet and maximum single hole water outlet is respectively less than 6m3/ h, working face extraction gushes
The water yield is less than 10m3/ h, above-mentioned statistical number to thin limestone using this kind of drilling it was demonstrated that carry out high-pressure slip-casting, it is possible to achieve advanced
Regional, compared with conventional water control technique, security reliability is greatly improved, and realizes deep mining base plate limestone water
Evil is administered, it is to avoid base plate karst water leak accident occurs to ensure safety in production.
The present invention is exemplarily described above in conjunction with embodiment, it is clear that the present invention is implemented and do not receive above-mentioned side
The restriction of formula, if the improvement of the various unsubstantialities that method of the present invention design and technical scheme are carried out is employed, or without
Improve and the design of the present invention and technical scheme are directly applied to into other occasions, within protection scope of the present invention.
Claims (7)
1. a kind of thin layer limestone surface orientation creeps into horizontal multilevel branch inlet well, including ground main aperture, it is characterised in that：Institute
The ground main aperture stated vertically extends to underground, passes through from ground to underground through the vertical straight hole section bored of horizon d and under coal seam
The concordant section that one ash forward gets out, straight hole section arranges kickoff point (KOP) away from the one end on ground at coal seam, under kickoff point (KOP) to coal seam
The middle part inclined drilling of three ashes forms orientation leads-slanting section, orient the two ends of leads-slanting section respectively with straight hole section and concordant section UNICOM, its
Middle main aperture concordant section separates multiple I and II branched holes in fan-shaped distribution along the nearly level of concordant.
2. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 1
It is：One end of described one-level branched hole is located at main aperture concordant section, and the other end forward prolongs under coal seam through the nearly level of an ash
Stretch, the line of elongated end is sector.
3. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 2
It is：Spacing≤2 times sector the radius of described one-level branch bore ends, is 50～120m.
4. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 2
It is：The spacing preferably 60～80m of described one-level branch bore ends.
5. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 1
It is：End nearly level of the two grades of described branched holes from its affiliated one-level branched hole away from main aperture one end forward extends, and extends
The line at end is sector.
6. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 5
It is：Spacing≤2 times sector the radius of two grades of described branch's bore ends, is 50～120m.
7. horizontal multilevel branch inlet well, its feature are crept into according to a kind of thin layer limestone surface orientation described in claim 5
It is：The spacing preferably 60～80m of two grades of described branch's bore ends.
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| CN201611094032.8A CN106593300A (en) | 2016-12-02 | 2016-12-02 | Thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole |
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| CN201611094032.8A CN106593300A (en) | 2016-12-02 | 2016-12-02 | Thin-layer limestone ground directional drilling horizontal multi-stage branch grouting drill hole |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217987A (en) * | 2017-05-27 | 2017-09-29 | 中国石油集团渤海钻探工程有限公司 | Colliery flood administers well boring method |
| CN107740701A (en) * | 2017-11-27 | 2018-02-27 | 山东省邱集煤矿 | A kind of method of the accurate grout transformation of top plate thin layer limestone aquifer |
| CN108708676A (en) * | 2018-08-16 | 2018-10-26 | 山东省邱集煤矿有限公司 | One kind new sidetracking method of nearly horizontal orientation under the conditions of thin layer limestone |
| CN108894727A (en) * | 2018-07-05 | 2018-11-27 | 中国矿业大学 | The water-retaining method of ground level directional drilling slip casting closure overlying strata water producing fractures main channel |
| CN109989711A (en) * | 2019-04-12 | 2019-07-09 | 宿州学院 | A kind of microelement method for improving surface orientation and boring with layer rate |
| CN110159344A (en) * | 2019-05-29 | 2019-08-23 | 翟卓凡 | A kind of mine filling system and filling method thereof |
| CN110566118A (en) * | 2019-09-09 | 2019-12-13 | 中煤科工集团西安研究院有限公司 | Advanced grouting transformation method for combined directional hole of underground deep-buried aquifer bottom plate of coal mine |
| CN112483172A (en) * | 2020-11-25 | 2021-03-12 | 中国煤炭地质总局水文地质局 | Method for artificially reconstructing water blocking boundary |
| CN112502774A (en) * | 2020-09-23 | 2021-03-16 | 淮北矿业股份有限公司 | Method for dredging limestone water by utilizing ground directional water collecting holes |
| CN112814737A (en) * | 2021-03-10 | 2021-05-18 | 淮南矿业(集团)有限责任公司 | Collapse column advanced treatment method and system based on laminated multi-branch horizontal well |
| CN113107423A (en) * | 2021-04-13 | 2021-07-13 | 宿州学院 | Coal field bottom plate grouting control method based on water-soluble fluorescent agent |
| CN113323025A (en) * | 2021-05-25 | 2021-08-31 | 中国建筑第八工程局有限公司 | Leaking stoppage treatment method for horizontal parting line of foundation pit bottom plate |
| CN113622952A (en) * | 2021-08-06 | 2021-11-09 | 中国煤炭地质总局水文地质局 | Comprehensive treatment method for water damage of mountain green coal in structurally complex area |
| CN114293994A (en) * | 2021-12-09 | 2022-04-08 | 中国建筑第五工程局有限公司 | Control structure and construction method for vertical deformation of existing tunnel during construction of vertically-overlapped tunnel |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217987A (en) * | 2017-05-27 | 2017-09-29 | 中国石油集团渤海钻探工程有限公司 | Colliery flood administers well boring method |
| CN107740701A (en) * | 2017-11-27 | 2018-02-27 | 山东省邱集煤矿 | A kind of method of the accurate grout transformation of top plate thin layer limestone aquifer |
| CN108894727B (en) * | 2018-07-05 | 2021-01-19 | 中国矿业大学 | Water retention method for plugging main channel of overburden rock water flowing fracture by grouting in ground horizontal directional drilling |
| CN108894727A (en) * | 2018-07-05 | 2018-11-27 | 中国矿业大学 | The water-retaining method of ground level directional drilling slip casting closure overlying strata water producing fractures main channel |
| CN108708676A (en) * | 2018-08-16 | 2018-10-26 | 山东省邱集煤矿有限公司 | One kind new sidetracking method of nearly horizontal orientation under the conditions of thin layer limestone |
| CN108708676B (en) * | 2018-08-16 | 2021-02-02 | 山东省邱集煤矿有限公司 | Near-horizontal directional new lateral drilling method under condition of thin-layer limestone |
| CN109989711A (en) * | 2019-04-12 | 2019-07-09 | 宿州学院 | A kind of microelement method for improving surface orientation and boring with layer rate |
| CN110159344A (en) * | 2019-05-29 | 2019-08-23 | 翟卓凡 | A kind of mine filling system and filling method thereof |
| CN110566118A (en) * | 2019-09-09 | 2019-12-13 | 中煤科工集团西安研究院有限公司 | Advanced grouting transformation method for combined directional hole of underground deep-buried aquifer bottom plate of coal mine |
| CN110566118B (en) * | 2019-09-09 | 2021-03-26 | 中煤科工集团西安研究院有限公司 | Advanced grouting transformation method for combined directional hole of underground deep-buried aquifer bottom plate of coal mine |
| CN112502774A (en) * | 2020-09-23 | 2021-03-16 | 淮北矿业股份有限公司 | Method for dredging limestone water by utilizing ground directional water collecting holes |
| CN112483172A (en) * | 2020-11-25 | 2021-03-12 | 中国煤炭地质总局水文地质局 | Method for artificially reconstructing water blocking boundary |
| CN112814737A (en) * | 2021-03-10 | 2021-05-18 | 淮南矿业(集团)有限责任公司 | Collapse column advanced treatment method and system based on laminated multi-branch horizontal well |
| CN112814737B (en) * | 2021-03-10 | 2023-03-14 | 淮南矿业(集团)有限责任公司 | Collapse column advanced treatment method and system based on laminated multi-branch horizontal well |
| CN113107423A (en) * | 2021-04-13 | 2021-07-13 | 宿州学院 | Coal field bottom plate grouting control method based on water-soluble fluorescent agent |
| CN113323025A (en) * | 2021-05-25 | 2021-08-31 | 中国建筑第八工程局有限公司 | Leaking stoppage treatment method for horizontal parting line of foundation pit bottom plate |
| CN113622952A (en) * | 2021-08-06 | 2021-11-09 | 中国煤炭地质总局水文地质局 | Comprehensive treatment method for water damage of mountain green coal in structurally complex area |
| CN114293994A (en) * | 2021-12-09 | 2022-04-08 | 中国建筑第五工程局有限公司 | Control structure and construction method for vertical deformation of existing tunnel during construction of vertically-overlapped tunnel |
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Application publication date: 20170426 |