CN106223961A - A kind of coal mine return air big lane passing fault tunneling construction method - Google Patents
A kind of coal mine return air big lane passing fault tunneling construction method Download PDFInfo
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- CN106223961A CN106223961A CN201610615757.0A CN201610615757A CN106223961A CN 106223961 A CN106223961 A CN 106223961A CN 201610615757 A CN201610615757 A CN 201610615757A CN 106223961 A CN106223961 A CN 106223961A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
Abstract
The present invention provides a kind of coal mine return air big lane passing fault tunneling construction method, comprises the following steps: step S1, and driving detours, and detours according to original tunnelling, detours vertical with fault strike；Step S2, reserved rock emits, and calculates and designs rock and emit；Step S3, slip casting, first carry out material selection, then calculate grouting amount, then carry out drilling design, then orifice tube be designed and fix, last slip casting；Compared with prior art, the present invention has following beneficial effect: ensure that return air big lane passing fault passes through；Ensure that passing fault smooth construction, it is ensured that personal safety and property safety and mine ventilation system are quickly formed, it is ensured that mine safety production.
Description
Technical field
The present invention is a kind of coal mine return air big lane passing fault tunneling construction method.
Background technology
It is domestic that red Qing Liang colliery is positioned at Dalate Banner, Ordos City, Inner Mongolia Autonomous Region, is subordinated to tower the highest Le mining area.
Designed mine capacity: 6.0Mt/a；Showing according to geologic information, 3-1 return air big lane average thickness is about 4.87m, and coal seam is pushed up
Slate is mainly conglomerate and siltstone, and local is fine sandstone or kern stone, and base plate lithology is mainly Sandy Silt, mud
Rock, local are medium-fine sand rock, and DF14 tomography is normal fault, drop H=17m, 65 ° of inclination angle, and balkstone is mud stone, conglomerate and portion
Dividing conglomerate, base plate is sandstone.
Tomography is being met along the tunneling process of top in the big lane of red celebrating beam coal mine return air, meets head on roof fall.Coal seam, place is 3-1
Coal, nature of coal seam thickness 2.90～6.85m, average 5.10m.Minable thickness 2.86～6.85m, average 4.87m, from inbreak situation
Seeing that roof is Sandy Silt, at the fall of ground of place, rear portion is whole enzymatic method, meets tomography and enter rock gangway at roof fall.At roof fall
Tunnel, rear portion uses anchor net and just sprays supporting, and drift section is rectangle, surveys a width of 5.8m in tunnel, high 4m.Employing development machine is executed
Work, development machine rear portion is arranged ribbon conveyer, is colloid air duct at conveyer brattice way spandrel arch.
Development machine is when carrying out a new circulation tunneling construction, and part rock has just been tunneled in the portion of side, right side that meets head on, and driving opening is
Perpendicular row strip, open rear section is a crushed zone, thinks, crushed zone, under rock pressure and hydrops effect, breaks through
Weak location rock stratum, forms infundibulate and emits top opening.Meet head on, after roof fall, to form Gangue at opening part, withstand funnel openings, make
Obtaining roof fall and do not continue extension, spoil is based on broken cash and cobblestone.
Drilling tomography, bore position is in the big lane of return air and meets head on, and apart from left side 1.1m, top board 3.3m, top rade 1 °, bores
The long 8.8m in hole；Boring 0-4.1m section is coal seam, and boring 4.1-6.5m section is mud stone, and boring 6.5-8.8m section is packsand；Meet head on
Water yield starts as 9.5m3/ h, present water consumption is about 4m3/ h, tomography DF14, drop 17m, 60 ° of inclination angle, move towards big with return air
Lane angle 35 °.
3-1 return air big lane, red Qing Liang colliery penetrating ground has the spies such as watery is strong, lithology weak, geologic condition are complicated
Point, discloses tomography according to reality and shows, in 3-1 return air big lane, driving runs into DF14 tomography to 1227, and fault strike is 145 °, with
Tunnelling direction becomes 35 ° of angles, and 65 ° of inclination angle, drop is about 17m, and turn-off is 2.5m.Tomography norm al discharge rate is 4m3/h.Top
Plate is broken and top board trickle is big, and roadway construction anchor cable and anchor pole lost efficacy.When tunneling construction, meet head on right side, to form a tomography
Broken breach, breach funneling shape, under the effect of rock gravity and hydrops pressure, broken；Breach is constantly gushed out spoil, gives
Construction brings difficulty, and driving speed is slow, and existing anchor rete cord spray supporting construction is difficult and can not play its due supporting effect,
Bringing bigger hidden danger to 3-1 return air big lane construction safety, construction speed causes and has a strong impact on, and spoil with cobblestone and mud stone is
Main.Simultaneously as the big lane of 3-1 return air is responsible for whole mine 3-1 coal ventilating system, logical for ensureing that full ore deposit realizes full blast pressure as early as possible
Wind system, needs accelerating construction progress, meets ventilation needs, and construction safety.Ore deposit side research determine the big lane of 3-1 return air, meet head on to
North is stepped back and is constructed at 29m, and 3-1 return air big lane return air detours, and is perpendicular to tomography driving.For construction safety and property safety, special
This have developed a kind of coal mine return air big lane passing fault tunneling construction method.
Summary of the invention
The deficiency existed for prior art, it is an object of the present invention to provide a kind of coal mine return air big lane passing fault tunneling construction
Method, to solve the problem proposed in above-mentioned background technology, the present invention is easy to use, it is simple to operation, good stability, reliability
High.
To achieve these goals, the present invention is to realize by the following technical solutions: a kind of coal mine return air big lane mistake
Tomography tunneling construction method, comprises the following steps:
Step S1, driving detours, and detours according to original tunnelling, detours vertical with fault strike；
Step S2, reserved rock emits, and calculates and designs rock and emit；
Step S3, slip casting, first carry out material selection, then calculate grouting amount, then carry out drilling design, right aperture after
Mouth pipe is designed and fixes, last slip casting.
Further, in step s 2, according to formulaCalculate the thickness that only magmatic rock emits；
In formula: B is rock plug thickness；
P is final grouting pressure；
S is rock cap basal area；
λ is overload factor, and λ takes 1.1-1.2；
[τ] is that rock allows shearing strength；
L is tunnel-surrounding length.
Further, in the material of step S3 selects, needing to use single slurry and dual slurry, wherein single slurry uses and moulds
Property early injection pulp material；
Dual slurry uses cement and waterglass mixing, wherein:
Cement: P.O 42.5 Portland cement；
Waterglass: modulus M=2.8～3.1, concentration 30～35 ° of Be'.
Further, in step s3, grouting amount calculates according to grouting amount formula:
Q=A × β × η × V；
In formula: the total injection rate of Q serosity (m3)；
A serosity super diffusion consumption coefficient takes 1.5；
β serosity volumetric efficiency 0.9；
η fault belt average crack rate 10%；
The rock mass volume that V is noted, m3；
The rock mass volume V=S × L noted；
In formula: S is by the basal area of note rock mass；
L is by note rock mass length.
Further, in step s3, drilling design refers to use twice pore-forming mode, and hole termination depth is according to boreholes drilling
Result determines that tomography thickness, horizontal drilling length exceed tomography highest distance position 5m.
Further, in step s3, orifice tube is designed and fixes:
Orifice tube uses diameter 70mm welded tube, and single long 6m, 7 unilateral band high pressure flanges, side is threaded, remaining hole
Mouth pipe, is bilateral screw thread, and flange side adds solder joint；
Orifice tube is fixing in two steps, and the first step enters in boring under orifice tube bond pad locations twines fiber crops, second step slip casting
Carrying out full packages to fix, second step terminates, and solidifies more than 8h, after bulge test, carries out secondary pore-forming.
Further, the mode of slip casting is the most single slurry then dual slurry；
In single slurry, first pour plasticity early injection pulp material into massing machine, after stirring, pour stock tank into, at note
Under the effect of stock pump, introduced in boring by high pressure valve and orifice valves；
In dual slurry, first pour cement and water into massing machine, after stirring, pour stock tank into, waterglass is introduced
In grouting pump, under the effect of grouting pump, introduced in boring by high pressure valve and orifice valves；
When slip casting, grouting pressure is 2～2.5 times of hydrostatic pressure；
Slip casting should carry out setting-out experiment, the sealing of testing bore holes and safety before starting, the force value of setting-out experiment is
1.2～1.5 times of final grouting pressure, when stable 15min is without exception, can start formal mortar depositing construction.
When grouting pressure reaches final grouting pressure value, furnishing 1 grade (16L/min), low discharge voltage stabilizing 20min, this brill can be terminated
The slip casting work in hole.
Beneficial effects of the present invention: a kind of coal mine return air big lane passing fault tunneling construction method of the present invention, it is ensured that return
Feng great lane passing fault passes through；Ensure that passing fault smooth construction, it is ensured that personal safety and property safety and mine ventilation system
System is quickly formed, it is ensured that mine safety production.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below in conjunction with
Detailed description of the invention, is expanded on further the present invention.
The present invention provides a kind of technical scheme: a kind of coal mine return air big lane passing fault tunneling construction method, including following step
Rapid:
Step S1, driving detours, and detours according to original tunnelling, detours vertical with fault strike；
Step S2, reserved rock emits, and calculates and designs rock and emit；
Step S3, slip casting, first carry out material selection, then calculate grouting amount, then carry out drilling design, right aperture after
Mouth pipe is designed and fixes, last slip casting.
In step s 2, according to formulaCalculate the thickness that only magmatic rock emits；
In formula: B is rock plug thickness；
P is final grouting pressure；
S is rock cap basal area；
λ is overload factor, and λ takes 1.1-1.2；
[τ] is that rock allows shearing strength；
L is tunnel-surrounding length.
In the material of step S3 selects, needing to use single slurry and dual slurry, wherein single slurry uses plasticity early injection
Pulp material；
Dual slurry uses cement and waterglass mixing, wherein:
Cement: P.O 42.5 Portland cement；
Waterglass: modulus M=2.8～3.1, concentration 30～35 ° of Be'.
Further, in step s3, grouting amount calculates according to grouting amount formula:
Q=A × β × η × V；
In formula: the total injection rate of Q serosity (m3)；
A serosity super diffusion consumption coefficient takes 1.5；
β serosity volumetric efficiency 0.9；
η fault belt average crack rate 10%；
The rock mass volume that V is noted, m3；
The rock mass volume V=S × L noted；
In formula: S is by the basal area of note rock mass；
L is by note rock mass length.
In step s3, drilling design refers to use twice pore-forming mode, and hole termination depth determines according to boreholes drilling result
Tomography thickness, horizontal drilling length exceedes tomography highest distance position 5m.
In step s3, orifice tube is designed and fixes:
Orifice tube uses diameter 70mm welded tube, and single long 6m, 7 unilateral band high pressure flanges, side is threaded, remaining aperture
Pipe, is bilateral screw thread, and flange side adds solder joint；
Orifice tube is fixing in two steps, and the first step enters in boring under orifice tube bond pad locations twines fiber crops, second step slip casting
Carrying out full packages to fix, second step terminates, and solidifies more than 8h, after bulge test, carries out secondary pore-forming.
The mode of slip casting is the most single slurry then dual slurry；
In single slurry, first pour plasticity early injection pulp material into massing machine, after stirring, pour stock tank into, at note
Under the effect of stock pump, introduced in boring by high pressure valve and orifice valves；
In dual slurry, first pour cement and water into massing machine, after stirring, pour stock tank into, waterglass is introduced
In grouting pump, under the effect of grouting pump, introduced in boring by high pressure valve and orifice valves；
When slip casting, grouting pressure is 2～2.5 times of hydrostatic pressure；
Slip casting should carry out setting-out experiment, the sealing of testing bore holes and safety before starting, the force value of setting-out experiment is
1.2～1.5 times of final grouting pressure, when stable 15min is without exception, can start formal mortar depositing construction.
When grouting pressure reaches final grouting pressure value, furnishing 1 grade (16L/min), low discharge voltage stabilizing 20min, this brill can be terminated
The slip casting work in hole.
Ensure that return air big lane passing fault passes through；Ensure that passing fault smooth construction, it is ensured that personal safety and property
Safety and mine ventilation system are quickly formed, it is ensured that mine safety production.
As one embodiment of the present of invention: when constructing in lane big to 3-1 return air, with specific reference to following steps:
Step S1, driving detours, and detours according to original tunnelling, detours vertical with fault strike.
Step S2, reserved rock emits, and calculates and designs rock and emit；Thickness B=8.4 × 3.14 × 2.7 that only magmatic rock emits2×1.1/
0.5×(3.14×2.7+5.4+1.4×2)≈26m。
Step S3, slip casting, first carry out material selection, then calculate grouting amount, then carry out drilling design, right aperture after
Mouth pipe is designed and fixes, last slip casting；
In the material of step S3 selects, needing to use single slurry and dual slurry, wherein single slurry uses plasticity early injection
Pulp material；
Dual slurry uses cement and waterglass mixing, wherein:
Cement: P.O 42.5 Portland cement；
Waterglass: modulus M=2.8～3.1, concentration 30～35 ° of Be'.
Further, in step s3, grouting amount calculates according to grouting amount formula:
Q=A × β × η × V；
In formula: the total injection rate of Q serosity (m3)；
A serosity super diffusion consumption coefficient takes 1.5；
β serosity volumetric efficiency 0.9；
η fault belt average crack rate 10%；
The rock mass volume that V is noted, m3；
The rock mass volume V=S × L noted；
In formula: S is by the basal area of note rock mass；
L is by note rock mass length.
When calculating grouting amount, slip casting tunnel is Semicircular tunnel, clear height 4.1m, and high wide 5.4m, according to probing feelings
Condition speculates, it is contemplated that width is 2.4m, and drilling depth exceedes crushed zone 5m, then be about 7.4m by slip casting rock mass length.Dilation angle
Calculate by 5m.
S=π r2=3.14 × 6.72≈141m2；
V=S × L=141 × 7.4 ≈ 1043m3；
Q=A × β × η × V=1.5 × 0.9 × 10% × 1043 ≈ 140m3；
Single slurry, dual slurry are by 80% and 20% calculating of total grouting amount, then single slurry is 112m3, dual slurry grouting amount
For 28m3。
In step s3, drilling design refers to use twice pore-forming mode, boring to use 2 pore-forming modes, opening diameter
For 75mm, hole depth 25m, whole bore dia 50mm, hole termination depth determines tomography thickness, horizontal drilling length according to boreholes drilling result
Exceed tomography highest distance position 5m.
When boring, boring is arranged in reserved rock cap and is evenly arranged with fault belt interface, drill with ferrule under the left and right sides
Hole is outwards from the horizontal by 2 ° of angles, and remaining boring is outwards from the horizontal by 3 ° of angles.
In step s3, orifice tube is designed and fixes:
Orifice tube uses diameter 70mm welded tube, and single long 6m, 7 unilateral band high pressure flanges, side is threaded, remaining aperture
Pipe, is bilateral screw thread, and flange side adds solder joint；
Orifice tube is fixing in two steps, and the first step enters in boring under orifice tube bond pad locations twines fiber crops, second step slip casting
Carrying out full packages to fix, second step terminates, and solidifies more than 8h, after bulge test, carries out secondary pore-forming.
The mode of slip casting is the most single slurry then dual slurry；
In single slurry, first pour plasticity early injection pulp material into massing machine, after stirring, pour stock tank into, at note
Under the effect of stock pump, introduced in boring by high pressure valve and orifice valves；
In dual slurry, first pour cement and water into massing machine, after stirring, pour stock tank into, waterglass is introduced
In grouting pump, under the effect of grouting pump, introduced in boring by high pressure valve and orifice valves；
Grouting pressure is one of factor affecting serosity effect, and when grouting pressure is too small, grout mixing reduces, rock mass
Not reaching intended consolidation effect, when grouting pressure is excessive, grout mixing expands, and causes serosity to waste.
Grouting pressure is 2～2.5 times of hydrostatic pressure, tunnel absolute altitude be 970m, 3-1 coal water level elevation be 1384.79～
1451.21m, hydrostatic pressure is 4.2Mpa, and design final grouting pressure is 8.4～10.5Mpa.
Slip casting should carry out packer permeability test, the sealing of test system and safety before starting, the force value of setting-out experiment is
1.2～1.5 times of final grouting pressure, i.e. 10.1～12.6Mpa, when stable 15min is without exception, formal slip casting can be started and execute
Work.
When grouting pressure reaches final grouting pressure value, when i.e. 8.4～10.5Mpa, furnishing 1 grade (16L/min), low discharge voltage stabilizing
20min, can terminate the slip casting work in this hole.
By this method, by taking strong technical measures and organiztion measure to ensure that red Qing Liang colliery 3-1 return air
The smooth construction of big lane passing fault.Use and detour and grouting program in the construction of 3-1 coal, it is ensured that 3-1 return air big lane passing fault is suitable
Profit is passed through；Detoured erection U-shaped steel canopy and grouting and reinforcing scheme by return air of taking to construct, designed by drift section optimization and
The measures such as the optimization design of support form, it is ensured that passing fault smooth construction, it is ensured that personal safety and property safety and mine lead to
Wind system is quickly formed, it is ensured that mine safety production.
The ultimate principle of the present invention and principal character and advantages of the present invention are more than shown and described, for this area skill
For art personnel, it is clear that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing substantially from the present invention spirit or
In the case of basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from the point of view of which point, all should be by
Embodiment regards exemplary as, and is nonrestrictive, the scope of the present invention by claims rather than on state
Bright restriction, it is intended that include all changes fallen in the implication of equivalency and scope of claim in the present invention
In.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (7)
1. a coal mine return air big lane passing fault tunneling construction method, it is characterised in that: comprise the following steps:
Step S1, driving detours, and detours according to original tunnelling, detours vertical with fault strike；
Step S2, reserved rock emits, and calculates and designs rock and emit；
Step S3, slip casting, first carry out material selection, then calculate grouting amount, then carry out drilling design, then to orifice tube
It is designed and fixes, last slip casting.
A kind of big lane of coal mine return air the most according to claim 1 passing fault tunneling construction method, it is characterised in that: in step
In S2, according to formulaCalculate the thickness that only magmatic rock emits；
In formula: B is rock plug thickness；
P is final grouting pressure；
S is rock cap basal area；
λ is overload factor, and λ takes 1.1-1.2；
[τ] is that rock allows shearing strength；
L is tunnel-surrounding length.
A kind of big lane of coal mine return air the most according to claim 1 passing fault tunneling construction method, it is characterised in that: in step
During the material of S3 selects, needing to use single slurry and dual slurry, wherein single slurry uses plasticity early injection pulp material；
Dual slurry uses cement and waterglass mixing, wherein:
Cement: P.O 42.5 Portland cement；
Waterglass: modulus M=2.8～3.1, concentration 30～35 ° of Be'.
A kind of big lane of coal mine return air the most according to claim 1 passing fault tunneling construction method, it is characterised in that: in step
In S3, grouting amount calculates according to grouting amount formula:
Q=A × β × η × V；
In formula: the total injection rate of Q serosity (m3)；
A serosity super diffusion consumption coefficient takes 1.5；
β serosity volumetric efficiency 0.9；
η fault belt average crack rate 10%；
The rock mass volume that V is noted, m3；
The rock mass volume V=S × L noted；
In formula: S is by the basal area of note rock mass；
L is by note rock mass length.
A kind of big lane of coal mine return air the most according to claim 1 passing fault tunneling construction method, it is characterised in that: in step
In S3, drilling design refers to use twice pore-forming mode, and hole termination depth determines tomography thickness according to boreholes drilling result, and level is bored
Enter length and exceed tomography highest distance position 5m.
A kind of big lane of coal mine return air the most according to claim 1 passing fault tunneling construction method, it is characterised in that: in step
In S3, orifice tube is designed and fixes:
Orifice tube uses diameter 70mm welded tube, single long 6m, 7 unilateral band high pressure flanges, and side is threaded, remaining orifice tube,
Being bilateral screw thread, flange side adds solder joint；
Orifice tube is fixing in two steps, and the first step enters in boring under orifice tube bond pad locations twines fiber crops, and second step slip casting is carried out
Full packages is fixed, and second step terminates, and solidifies more than 8h, after bulge test, carries out secondary pore-forming.
A kind of big lane of coal mine return air the most according to claim 6 passing fault tunneling construction method, it is characterised in that: slip casting
Mode is the most single slurry then dual slurry；
In single slurry, first pour plasticity early injection pulp material into massing machine, after stirring, pour stock tank into, at grouting pump
Effect under, introduced in boring by high pressure valve and orifice valves；
In dual slurry, first pour cement and water into massing machine, after stirring, pour stock tank into, waterglass is introduced slip casting
In pump, under the effect of grouting pump, introduced in boring by high pressure valve and orifice valves；
When slip casting, grouting pressure is 2～2.5 times of hydrostatic pressure；
Slip casting should carry out setting-out experiment, the sealing of testing bore holes and safety before starting, the force value of setting-out experiment is slip casting
1.2～1.5 times of final pressure, when stable 15min is without exception, can start formal mortar depositing construction.
When grouting pressure reaches final grouting pressure value, furnishing 1 grade (16L/min), low discharge voltage stabilizing 20min, this boring can be terminated
Slip casting works.
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Cited By (4)
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| CN106837333A (en) * | 2017-01-17 | 2017-06-13 | 济宁矿业集团有限公司霄云煤矿 | A kind of fully-mechanized mining working pre-tunnel laneway road formula passing fault method |
| CN107939435A (en) * | 2017-12-17 | 2018-04-20 | 北京昊华能源股份有限公司 | A kind of coal road dash system |
| CN109057850A (en) * | 2018-08-27 | 2018-12-21 | 神木县隆德矿业有限责任公司 | A kind of novel load-carrying air crossing and return air detour piercing technique |
| CN113605913A (en) * | 2021-09-01 | 2021-11-05 | 东莞理工学院 | Rock underground passage construction method |
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| CN106837333A (en) * | 2017-01-17 | 2017-06-13 | 济宁矿业集团有限公司霄云煤矿 | A kind of fully-mechanized mining working pre-tunnel laneway road formula passing fault method |
| CN107939435A (en) * | 2017-12-17 | 2018-04-20 | 北京昊华能源股份有限公司 | A kind of coal road dash system |
| CN109057850A (en) * | 2018-08-27 | 2018-12-21 | 神木县隆德矿业有限责任公司 | A kind of novel load-carrying air crossing and return air detour piercing technique |
| CN113605913A (en) * | 2021-09-01 | 2021-11-05 | 东莞理工学院 | Rock underground passage construction method |
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| CN106223961B (en) | 2018-11-06 |
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