CN107313788B - The method and device of grouting for water blocking under strong hydraulic connection - Google Patents
The method and device of grouting for water blocking under strong hydraulic connection Download PDFInfo
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- CN107313788B CN107313788B CN201710707390.XA CN201710707390A CN107313788B CN 107313788 B CN107313788 B CN 107313788B CN 201710707390 A CN201710707390 A CN 201710707390A CN 107313788 B CN107313788 B CN 107313788B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000000903 blocking effect Effects 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 74
- 238000007569 slipcasting Methods 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims abstract description 11
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 235000010469 Glycine max Nutrition 0.000 claims description 4
- 244000068988 Glycine max Species 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 4
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 3
- 244000097592 Ptelea trifoliata Species 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 241001074085 Scophthalmus aquosus Species 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of method and devices of grouting for water blocking under strong hydraulic connection, including by Water in mined area area physical prospecting situation, obtain the position of water passage, and the parameter of the position of the Position Design drill site according to water passage and inlet well；According to the parameter of the drilling, bore operation is carried out and carries out orifice tube to divide into；After orifice tube is divided into, slip casting operation is carried out；After slip casting terminates solidification, pressure test is carried out to drilling using clear water.The present invention provides a kind of method and device of grouting for water blocking under strong hydraulic connection, is blocked by the slip casting to water passage, eliminates the hidden water dezaster in unknown goaf.
Description
Technical field
The invention belongs to coal mine gob water damage integrated control field, in particular to the side of grouting for water blocking under strong hydraulic connection
Method and device.
Background technique
Grouting and sealing technique be Pitwater disaster administer important means, due to rock mass have various structures, anisotropy,
The features such as hydrogeologic condition otherness is big proposes severe challenge for mine water disaster grouting treatment.Grouting theory is to flow
Grow up in the theoretical basis of mechanics, hydraulics, Solid Mechanics etc., the liquid form and process of setting to slurries carry out
Analytic process.In fact, the liquid form multiplicity of slurries in the earth formation, and these forms of motion are along with the change of formation properties
Change, the variation of the property of slurries and pressure and constantly change or and deposit, and subsurface contains a variety of geological stratifications, especially the
Four systems rush in diluvial formation, and bored grouting water blockoff is more difficult；Currently, being bored as that drills under the conditions of complicated geological environment increases
Bar part serious wear causes scrapping for drilling rod, or even causes down-hole equipment failure or accident occur.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides slip casting under a kind of strong hydraulic connection
The method and device of water blockoff is blocked by the slip casting to water passage, eliminates the hidden water dezaster in unknown goaf.
Technical solution: to achieve the above object, technical scheme is as follows:
The method of grouting for water blocking under strong hydraulic connection, comprising the following steps:
By Water in mined area area physical prospecting situation, the position of water passage is obtained, and is bored according to the Position Design of water passage
The position of field and the parameter of inlet well；
According to the parameter of the drilling, bore operation is carried out and carries out orifice tube to divide into；
After orifice tube is divided into, slip casting operation is carried out；
After slip casting terminates solidification, pressure test is carried out to drilling using clear water；
Slip casting method is recycled using segmented in the bore operation, comprising the following steps:
1. carrying out aperture using start bit, drilling occurs stopping creeping into immediately when the phenomenon that not returning water, mentions brill and accurate
Measure ruler more than drilling rod；
2. it is determined as the leak that drills if drilling rod and drill bit are unplugged, it need to be to carrying out grouting and reinforcing around hole wall；
3. after hole wall is reinforced, if drilling starts to return water, continuing to implement drilling, being carried out before drilling drilling to predeterminated position last
Once grouting Reinforcing hole wall；
4. the last time hole wall that drills uses the drill bit of No.1 smaller than start bit to carry out cleaning bottom of hole after reinforcing；
5. then dividing into the orifice tube less than boring aperture, and orifice tube divides into the half depth that length is not more than hole depth.
Further, concrete foundation is arranged in the construction, this inlet well includes several drillings, and the drilling
It is arranged by single row of holes, and position of opening is respectively positioned in concrete foundation.
Further, design arrangement inlet well 10, borehole bottom location spacing 4.5m~10m, hole depth 20.3m~35.5m.
Further, when slip casting operation, cement grout is injected into drilling using grouting pump, wait until pressure reach 3MPa and
After holding time no less than 3 minutes, slip casting can be stopped；
Cement has solidified after first time slip casting terminates 8h, carries out second of slip casting until hole wall surrounding rock crack is full of water
Mud；
After slip casting terminates 16h to be solidified, pressure test is carried out to drilling using clear water, test pressure control is 3MPa, such as
Fruit test pressure maintains the 3MPa duration to be no less than 30min, then hole Cementer work terminates.
Further, the slip casting includes the slurries of the three-level ratio of mud, the water ash weight ratio of the slurries be respectively 2:1,
1:1、0.5:1。
Further, the slurries include cement slurry and/or admixture；The admixture is sand, waterglass, soybean and stone
Son.
Further, the sand is the hard natural sand or artificial sand that partial size is not more than 2.5mm, and gravel fineness modulus is little
In 2.0, clay content is not more than 3%；The modulus of the waterglass is 2.4~3.0, and concentration is 30~45 Baume degrees；The stone
Partial size be 5mm~15mm.
Further, under strong hydraulic connection grouting for water blocking device, including drilling rod, the drilling rod is auger stem, described
Drilling rod middle section is polished rod portion, and spacing is provided with two shoulders in the polished rod portion, is provided on the outside of two shoulders resistance to
The outer diameter of grinding set, the wear-resistant sleeve is equal with auger stem outer diameter；Limbers, the drilling rod are offered along axis in the drilling rod
Both ends be respectively arranged with male connector screw thread and female screw thread.
Further, the helical blade of identical pitch, the helical-blade are provided on the spiral part of the auger stem
The outer diameter of piece is less than the spire outer diameter of auger stem.
The utility model has the advantages that the present invention, which solves the 4th system, rushes diluvial formation grouting reinforcement difficulty, winter construction concrete setting speed
The problems such as slow is spent, slip casting is improved by adjusting the slurry ratio of mud, interval slip casting, injection the methods of admixture and a variety of aggregates and applies
Work efficiency rate；And in such a way that segmented recycles slip casting method and surface grout injection borehole sealing river and the strong water passage in goaf；
Guarantee that orifice tube divides into quality by resistance test, improves slip casting effect；A kind of drilling rod of probing, middle part are provided simultaneously
It is provided with wearing layer, increases the wearability of drilling rod, double helix blade improves the service life of drilling rod.
Detailed description of the invention
Attached drawing 1 is the flow chart of grouting water blocking method under the strong hydraulic connection of the present invention；
Attached drawing 2 is the jackrod structure figure of grouting for water blocking under the strong hydraulic connection of the present invention；
Attached drawing 3 is the drilling rod half-section diagram of grouting for water blocking under the strong hydraulic connection of the present invention.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Such as the flow chart that attached drawing 1 is grouting water blocking method under the strong hydraulic connection of the present invention.
The method of grouting for water blocking under strong hydraulic connection, comprising the following steps:
By Water in mined area area physical prospecting situation, the position of water passage is obtained, and is bored according to the Position Design of water passage
The position of field and the parameter of inlet well；
According to the parameter of the drilling, bore operation is carried out and carries out orifice tube to divide into；
After orifice tube is divided into, slip casting operation is carried out；
After slip casting terminates solidification, pressure test is carried out to drilling using clear water.
The drill site position construction setting concrete foundation, this inlet well include several drillings, and the drilling
It is arranged by single row of holes, and position of opening is respectively positioned in concrete foundation.The construction of this slip casting drill site Position Design concrete foundation
Drill site, the long 5m of concrete foundation, wide 4m, plane is in rectangle, and drill site is arranged in above old dead zone EXIT POINT.
This design arrangement inlet well 10, borehole bottom location spacing 4.5m~10m, hole depth 20.3m~35.5m.Aperture
Length of tube is the depth of 0.2m to subterrane or less 1m on earth's surface.The borehole bottom location that drills is to enter auxiliary coal seam 1m.It can make
WithDrill bit construction drill, construction drill depth is up to 200m.
Slip casting method is recycled using segmented in the bore operation, comprising the following steps:
1. carrying out aperture using start bit, drilling occurs stopping creeping into immediately when the phenomenon that not returning water, mentions brill and accurate
Measure ruler more than drilling rod；
2. it is determined as the leak that drills if drilling rod and drill bit are unplugged, it need to be to carrying out grouting and reinforcing around hole wall；
3. after hole wall is reinforced, if drilling starts to return water, continuing to implement drilling, being carried out before drilling drilling to predeterminated position last
Once grouting Reinforcing hole wall；
4. the last time hole wall that drills uses the drill bit of No.1 smaller than start bit to carry out cleaning bottom of hole after reinforcing；
5. then dividing into the orifice tube less than boring aperture, and orifice tube divides into the half depth that length is not more than hole depth.
Drilling construction circular order is that orifice tube-drilling is divided into drilling-slip casting-, is crept into the position 2m at present after aperture
If first segment orifice tube, later every drilling 2m divides into an orifice pipe, until creeping into design position.
After orifice tube is divided into, slip casting operation is carried out, cement grout is injected into drilling using grouting pump, waits until pressure
After reaching 3MPa and holding time no less than 3 minutes, slip casting can be stopped；
Cement has solidified after first time slip casting terminates 8h, carries out second of slip casting until hole wall surrounding rock crack is full of water
Mud；
After slip casting terminates 16h to be solidified, pressure test is carried out to drilling using clear water, test pressure control is 3MPa, such as
Fruit test pressure maintains the 3MPa duration to be no less than 30min, then hole Cementer work terminates.
Grouting pressure uses 1.5~2MPa during drilling drilling, and the slip casting operational pressure behind the whole hole that drills uses 3MPa, pressure
Power can adjust determination during mortar depositing construction.Design pressure should be reached when slip casting as early as possible, classification is taken to rise when injection rate is big
Pressure.
The slip casting includes the slurries of the three-level ratio of mud, and the water ash weight ratio of the slurries is respectively 2:1,1:1,0.5:1.
The ratio of mud of initial grouting serous fluid is 2:1.
The slurries include cement slurry and/or admixture；The admixture is sand, waterglass, soybean and stone.The sand
It is not more than the hard natural sand or artificial sand of 2.5mm for partial size, gravel fineness modulus is not more than 2.0, and clay content is not more than 3%；
The modulus of the waterglass is 2.4~3.0, and concentration is 30~45 Baume degrees；The partial size of the stone is 5mm~15mm.Slip casting
Slurries transformation: when grouting pressure remains unchanged, and injection rate is persistently reduced, or when injection rate is constant and pressure persistently increases,
The ratio of mud must not be changed；When a certain injection rate than grade slurries is up to 20 tons or more, and grouting pressure and injection rate are without obvious
When variation, change dense level-one, if after improving slurries rank, grouting pressure and injection rate still without significant change when continue to improve slurries
The aggregates such as rank or injection stone, soybean.
Physical prospecting early period of the method for grouting for water blocking includes verifying water guide by transient electromagnetic detecting technology under strong hydraulic connection
Channel low-resistance band singularly, utilizes Water in mined area area physical prospecting achievement, it is contemplated that the quiet reserves of water in gob area are dredged by unrestrained water drilling hole
Waterdrainage amount analysis determines that goaf exists and stablizes nourishment source, abnormal in conjunction with transient electromagnetic low-resistance, determines feed channel position；
By determining and mending to the water-bearing layers such as goaf water, Quaternary aquifer water, library vehicle river water and water quality chemical examination and signature analysis
Water-supply source is analyzed by mining overburden structural analysis, the analysis of mining induced fissure spreading fracture and solid-liquid coupling Percolation Law, establishes library
Vehicle river water seepage flow feeds old dead zone mechanical model.Bored grouting slurries seepage flow mechanics theory in rock stratum hole, crack is analyzed, is built
Vertical slurries flow model in porous media, then simultaneously construction ground inlet well blocks river and the strong water passage in goaf for design.
The device of grouting for water blocking under strong hydraulic connection, including drilling rod, the drilling rod are auger stem, the drilling rod middle part
It is divided into polished rod portion, spacing is provided with two shoulders 3 in the polished rod portion, is provided with wear-resistant sleeve 4, institute on the outside of two shoulders 3
The outer diameter for stating wear-resistant sleeve 4 is equal with auger stem outer diameter；Limbers 5 is offered along axis in the drilling rod, the two of the drilling rod
End is respectively arranged with male connector screw thread and female screw thread.Male connector threaded portion is provided with baffle 6, is provided with gasket on baffle 6,
Limit and sealing function are played when mostly connecting with drilling rod；The male connector screw thread and female screw thread are the rectangular thread with screw pitch, are made
When more drilling rods are used in conjunction with each other, existing common 60 ° of screw threads and taper thread are compared, more stable torque can be provided and passed
It is dynamic, it is particularly suitable for using in more rock stratum areas.Drilling rod ontology is process by high-quality 42CrMoV material through entirety is quenched, is provided
Higher hardness and intensity, wearing layer can increase the service life of drilling rod, while reduce the abrasion of spire 1.
The helical blade 2 of identical pitch, the outer diameter of the helical blade 2 are provided on the spiral part of the auger stem
Less than 1 3~5mm of outer diameter of spire of auger stem.After the abrasion of spire 1, the dynamics of the intensity of drilling rod and lower brill will be big
Big to reduce, unworn helical blade 2 can replace spire 1 carry out lower brill at this time, increase the service life of drilling rod, save at
This.
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 (9)
- The method of grouting for water blocking under the last 1. hydraulic connection, it is characterised in that: the following steps are included:By Water in mined area area physical prospecting situation, the position of water passage is obtained, and the Position Design drill site according to water passage The parameter of position and inlet well；According to the parameter of the drilling, bore operation is carried out and carries out orifice tube to divide into；After orifice tube is divided into, slip casting operation is carried out；After slip casting terminates solidification, pressure test is carried out to drilling using clear water；Slip casting method is recycled using segmented in the bore operation, comprising the following steps:1. carrying out aperture using start bit, drilling occurs stopping creeping into immediately when the phenomenon that not returning water, mentions and bore and accurately measure Ruler more than drilling rod；2. it is determined as the leak that drills if drilling rod and drill bit are unplugged, it need to be to carrying out grouting and reinforcing around hole wall；3. after hole wall is reinforced, if drilling starts to return water, continuing to implement drilling, carrying out last time before drilling drilling to predeterminated position Grouting and reinforcing hole wall；4. the last time hole wall that drills uses the drill bit of No.1 smaller than start bit to carry out cleaning bottom of hole after reinforcing；5. then dividing into the orifice tube less than boring aperture, and orifice tube divides into the half depth that length is not more than hole depth.
- 2. the method for grouting for water blocking under strong hydraulic connection according to claim 1, it is characterised in that: apply the drill site position Concrete foundation is arranged in work, this inlet well includes several drillings, and the drilling is arranged by single row of holes, and position of opening It is respectively positioned in concrete foundation.
- 3. the method for grouting for water blocking under strong hydraulic connection according to claim 2, it is characterised in that: design arrangement slip casting is bored 10, hole, borehole bottom location spacing 4.5m~10m, hole depth 20.3m~35.5m.
- 4. the method for grouting for water blocking under strong hydraulic connection according to claim 1, it is characterised in that: when slip casting operation, make Cement grout is injected into drilling with grouting pump, after waiting until that pressure reaches 3MPa and holds time no less than 3 minutes, can be stopped Slip casting；Cement has solidified after first time slip casting terminates 8h, carries out second of slip casting until hole wall surrounding rock crack is full of cement Slurry；After slip casting terminates 16h to be solidified, pressure test is carried out to drilling using clear water, test pressure control is 3MPa, if examination Testing pressure maintains the 3MPa duration to be no less than 30min, then hole Cementer work terminates.
- 5. the method for grouting for water blocking under strong hydraulic connection according to claim 1, it is characterised in that: the slip casting includes three The slurries of the grade ratio of mud, the water ash weight ratio of the slurries is respectively 2:1,1:1,0.5:1.
- 6. the method for grouting for water blocking under strong hydraulic connection according to claim 5, it is characterised in that: the slurries include water Mud and/or admixture；The admixture is sand, waterglass, soybean and stone.
- 7. the method for grouting for water blocking under strong hydraulic connection according to claim 6, it is characterised in that: the sand be partial size not Hard natural sand or artificial sand greater than 2.5mm, gravel fineness modulus are not more than 2.0, and clay content is not more than 3%；The water glass The modulus of glass is 2.4~3.0, and concentration is 30~45 Baume degrees；The partial size of the stone is 5mm~15mm.
- 8. implementing the device of the method for grouting for water blocking under the described in any item strong hydraulic connections of Claims 1-4 4, feature exists In: including drilling rod, the drilling rod is auger stem, and the drilling rod middle section is polished rod portion, spacing setting in the polished rod portion Have two shoulders (3), is provided with wear-resistant sleeve (4) on the outside of two shoulders (3), the outer diameter and auger of the wear-resistant sleeve (4) Bar outer diameter is equal；Is offered limbers (5) along axis in the drilling rod, the both ends of the drilling rod be respectively arranged with male connector screw thread and Female screw thread.
- 9. the device according to claim 8 for implementing the method for grouting for water blocking under strong hydraulic connection, it is characterised in that: described The helical blade (2) of identical pitch is provided on the spiral part of auger stem, the outer diameter of the helical blade (2) is less than spiral Spire (1) outer diameter of drilling rod.
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| CN201710707390.XA CN107313788B (en) | 2017-08-17 | 2017-08-17 | The method and device of grouting for water blocking under strong hydraulic connection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108915690B (en) * | 2018-07-06 | 2020-01-17 | 中钢集团马鞍山矿山研究院有限公司 | Novel method for preventing water gushing of vertical shaft well wall in vertical shaft aquifer tunneling |
| CN109098688B (en) * | 2018-10-15 | 2020-07-07 | 山东交通学院 | Safe anti-blocking construction process for soft aggregate in underground ultra-deep drill hole of mine |
| CN109723466A (en) * | 2018-12-10 | 2019-05-07 | 中交一公局桥隧工程有限公司 | Tunnel primary support seepage grouting treatment construction method |
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