CN113530573B - Long-probe-short-probe-grouting combined water control method based on water inflow classification - Google Patents
Long-probe-short-probe-grouting combined water control method based on water inflow classification Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 238000010276 construction Methods 0.000 claims abstract description 50
- 230000005641 tunneling Effects 0.000 claims abstract description 32
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 33
- 238000005553 drilling Methods 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000011218 segmentation Effects 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 240000000491 Corchorus aestuans Species 0.000 claims description 3
- 235000011777 Corchorus aestuans Nutrition 0.000 claims description 3
- 235000010862 Corchorus capsularis Nutrition 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
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- 230000002706 hydrostatic effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
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- 238000005065 mining Methods 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
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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
- E21D11/04—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
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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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Abstract
The invention discloses a water control method based on combination of long detection, short detection and grouting of water inflow classification, which comprises the following steps: 1) The water inflow is divided into two categories of I and II according to the water inflow of the roadway working surface: 2) Judging the class of the water inflow of the roadway working surface, and if the water inflow belongs to class I, entering step 3); if the two types belong to the II type, the step 4) is entered; 3) Grouting and tunneling roadway construction by adopting long-exploring-short-exploring water holes; 4) Grouting and tunneling the tunnel construction by adopting a long exploring water hole; 5) Grouting and reinforcing construction. The invention divides the water inflow amount into two types aiming at the water inflow condition of the roadway working surface, covers the construction method adopted by the water inflow amount of the roadway working surface from large to small, breaks through the limitation of a single construction water shutoff process, meets the urgent need of a sudden comprehensive water inflow treatment scheme in the field of roadway tunneling construction, and has the advantages of safety, reliability, short construction period, practicability and high efficiency.
Description
Technical Field
The invention relates to the technical field of mine construction, in particular to a water control method based on combination of long detection, short detection and grouting of water inflow classification.
Background
Along with the increase of the mining depth and the mining range, the stress state of the rock mass of the original rock and the nearby area is changed due to the mining activity, so that the stability of surrounding rock is influenced, the water inflow amount of a mine is increased, and the water inflow phenomenon of a roof is caused. Mine water burst seriously threatens the safety production of mine underground engineering construction. According to statistics, about 80% of major safety accidents in underground engineering construction are caused by water gushing geological disasters and improper disposal, extremely disastrous personal casualties and economic losses are brought, and water gushing accidents induced by various bad geological structures and engineering disturbance actions become bottleneck problems for restricting the development of underground engineering construction of mines.
The mine tunnel construction water is the most important factor affecting the construction progress and quality, different construction methods are adopted according to different lithology (such as wide distribution, large thickness, extremely strong water permeability and water enrichment of deep gravel pebble aquifers) and different water inflow, and due to the complexity of hydrogeological conditions and the limitations of grouting water shutoff construction technology, if tunnel tunneling construction is carried out by adopting a single water exploration mode for water inflow, the water inflow is difficult to meet the requirement of tunnel prevention and control, the water inflow water shutoff effect of construction is not obvious, the construction period is prolonged, and serious economic loss is caused, so that the water exploration water shutoff construction is carried out correctly, safely and effectively. In order to save construction cost, different construction methods are adopted according to different water inflow amounts, so that the method for preventing and controlling water in a tunneling roadway is safe, reliable, short in construction period, practical and efficient, and is a major engineering problem to be solved in mine construction.
Disclosure of Invention
In order to solve the technical problems, the invention provides a long-probe-short-probe-grouting combined water control method which is simple in construction, safe and reliable and is based on water inflow classification.
The technical scheme for solving the problems is as follows: a long-detection-short-detection-grouting combined water control method based on water inflow classification comprises the following steps:
1) The water inflow is divided into two categories of I and II according to the water inflow of the roadway working surface:
the two categories are specifically:
i: the water inflow of the roadway working surface is more than or equal to 15m 3 /h；
II: the water inflow of the roadway working surface is less than 15m 3 /h；
2) Judging the class of the water inflow of the roadway working surface, and if the water inflow belongs to class I, entering step 3); if the two types belong to the II type, the step 4) is entered;
3) Grouting and tunneling roadway construction by adopting long-exploring-short-exploring water holes;
4) And (5) adopting a long-detection water hole grouting tunneling roadway for construction.
The water control method based on the combination of long detection, short detection and grouting of water inflow classification comprises the following specific steps:
3-1) firstly chiseling bare rock on a working surface of a roadway, selecting five parts of the axial front part of the roadway, the left side wall of the roadway, the right side wall of the roadway, the top plate of the roadway and the bottom plate of the roadway by using a down-the-hole drill according to construction conditions and water gushing conditions, respectively drilling water detection holes with the length of 50m, the diameter of 120mm and the horizontal slope angle of 6 degrees, enabling the tunneling depth to be 45m, enabling the left side wall of the roadway and the right side wall of the roadway to be 20m respectively, enabling the top plate of the roadway and the bottom plate of the roadway to be 15m respectively, and reserving secondary water detection safety barriers to take values of 5m;
3-2) judging the water inflow of the working surface, if the water inflow exceeds 15m 3 And (h) plugging water by adopting a mode of water detection and grouting at the same time, so that the water inflow of the working surface is lower than 15m 3 And/h, if the water inflow after grouting is still more than 15m 3 In the time of/h, a grouting hole is additionally arranged in front of the working face until the water inflow is lower than 15m 3 /h；
3-3) tunneling by adopting short probe water, wherein the control range is 5m in front of the tunnel, the left side wall and the right side wall of the tunnel are respectively 3.0m, and the top plate and the bottom plate of the tunnel are respectively 2.5m; the length of the short water detection hole is 5m, the allowed tunneling distance is 3m, if the water inflow is less than 10m 3 And (3) continuously tunneling the tunnel during the period of/h, if the water inflow is more than 10m 3 In the process of/h, grouting holes are added on the working surface of the roadway, grouting and water shutoff are carried out until the water inflow is reduced to 10m 3 And (3) stopping grouting below/h, and recovering the tunneling construction.
In the water control method based on the combination of long detection, short detection and grouting of water inflow classification, in the step 3-2), grouting and water shutoff are carried out by installing orifice pipes; when the orifice pipe is installed, jute is uniformly wound, a flange is installed at the end part, and a steel pipe for connecting a grouting pipe, a high-pressure cut-off valve and a pressure gauge is welded at the position 300mm away from the end part; and (3) sealing the orifice pipe by using double slurry, and plugging water in grouting operation.
The water control method based on the combination of long detection, short detection and grouting of water inflow classification comprises the following steps of: and (5) installing a drill bit of a drilling machine, punching to 5m, installing an orifice pipe, and grouting and water shutoff.
The method for preventing and controlling water in the tunneling roadway based on the combination of long detection, short detection and grouting of water inflow classification comprises the steps of 3-1) and 3-2) of construction of grouting tunneling roadway of long detection water holes in the step 4), and grouting and water shutoff of the long detection water holes.
In the method for controlling water by combining long detection and short detection and grouting based on water inflow classification, in the step 3) and the step 4), the grouting material of the grouting uses 425# Portland cement, the concentration of water glass is 40Be, and the modulus is 3.0; the volume ratio of the cement slurry to the water glass slurry is 1:0.5-0.8; cement slurry water cement ratio initial concentration is 2:1.
The water control method based on the combination of long detection, short detection and grouting of water inflow classification further comprises a grouting reinforcement construction step 5):
5-1) grouting equipment selection, wherein a grouting station is arranged at a distance of 5m from a working surface, and a 2TGZ60/210 type high-pressure grouting pump is arranged in the grouting station;
5-2) grouting mode and grouting hole arrangement: grouting and water plugging are carried out by adopting a tunnel segmentation forward grouting mode, the grouting segmentation length is 50m, the virtual slag of the tunnel face is cleaned, guide grouting holes are arranged, and water detection holes and pore diameters are arranged according to the fracture grade and the section sizeThe hole depth is 5m;
5-3) selecting and arranging the number of grouting holes: 6 fan-shaped radial grouting holes are distributed at the outer edge of the roadway, and the hole spacing and the row spacing are 1.48-2.0 m;
5-4) determining grouting material: the grouting material uses 425# ordinary Portland cement, the concentration of water glass is 40Be, and the modulus is 3.0; the volume ratio of the cement slurry to the water glass slurry is 1:0.5-0.8; cement slurry water cement ratio initial concentration is 2:1;
5-5) determining grouting pressure: initial grouting pressure P a ＝P o +(0.3～0.5)MPa，P o Is hydrostatic pressure, normal pressure P b ＝P o + (0.5-0.8) MPa, final pressure P c ＝2P o MPa；
5-6) slurry injection amount: the slurry injection quantity V is roughly calculated according to the diffusion radius and the rock fracture rate, and the calculation formula is as follows:
a-slurry consumption coefficient; r—slurry diffusion radius; h-is the height of the grouting section; η—rock fracture rate; beta-slurry filling factor; m-calculus rate;
5-7) grouting end: the grouting pressure reaches the design final pressure value, the injection quantity is less than 50-60L/min, the grouting is stable for more than 20 minutes, and the grouting is finished.
The invention has the beneficial effects that: the invention divides the water inflow amount into two types aiming at the water inflow condition of the roadway working surface, covers the construction method adopted by the water inflow amount of the roadway working surface from large to small, breaks through the limitation of a single construction water shutoff process, meets the urgent need of a sudden comprehensive water inflow treatment scheme in the field of roadway tunneling construction, and has the advantages of safety, reliability, short construction period, practicability and high efficiency.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic view of an upward section of a roadway ramp.
FIG. 3 is a cross-sectional view of a water detection and hole distribution on an ascending section of a tunnel ramp.
FIG. 4 is a schematic diagram of a water detection and hole distribution of an ascending section of a tunnel ramp.
Fig. 5 is a schematic view of radial grouting of a sector hole.
In the figure: 1. 1# drilling, 2# drilling, 3# drilling, 4# drilling, 5# drilling, 6# drilling, 7# drilling, 8 # drilling, axial forward of roadway, 9 # drilling, roadway floor, 10 # drilling, roadway left side wall, 11 # drilling, roadway right side wall, 12 # drilling, roadway roof, 13 # grouting holes, 1# grouting holes, 14 # grouting holes, 2# grouting holes, 15 # grouting holes, 3# grouting holes, 16 # grouting holes, 4# grouting holes, 17 # grouting holes, 5# grouting holes, 18 # grouting holes and 6# grouting holes.
Detailed Description
The invention is further described below with reference to the drawings and examples.
By taking the construction of a roadway with the width of 4000mm and the height of 4270mm in Hebei coal mine as an example, as shown in fig. 1, the water control method based on the combination of long detection, short detection and grouting of water inflow classification comprises the following steps:
1) The water inflow is divided into two categories of I and II according to the water inflow of the roadway working surface:
the two categories are specifically:
i: the water inflow of the roadway working surface is more than or equal to 15m 3 /h；
II: the water inflow of the roadway working surface is less than 15m 3 /h。
2) Judging the class of the water inflow of the roadway working surface, and if the water inflow belongs to class I, entering step 3); if the data belong to the II class, the step 4) is entered.
3) And adopting long-short detection water hole grouting tunneling tunnel construction, as shown in figures 2, 3 and 4.
The specific steps of the step 3) are as follows:
3-1) firstly removing bare rocks on a working surface of a roadway, selecting five parts of the roadway, namely an axial front part 8, a roadway left side part 10, a roadway right side part 11, a roadway top plate 12 and a roadway bottom plate 9 by using a down-the-hole drill according to construction conditions and water gushing conditions, respectively drilling water detection holes 1, 2, 3, 4, 5, 6 and 7 with the length of 50m, the diameter of 120mm and the horizontal slope angle of 6 degrees, wherein the number of the water detection holes for long detection is 7, the depth of the water detection holes for long detection is 50m, the allowable tunneling depth is 45m, the control range of the roadway left side part and the roadway right side part are 20m, the roadway top plate and the roadway bottom plate are 15m, and the reserved water detection safety barrier is 5m.
3-2) judging the water inflow of the working surface, if the water inflow exceeds 15m 3 And (h) plugging water by adopting a mode of water detection and grouting at the same time, so that the water inflow of the working surface is lower than 15m 3 And/h, if the water inflow after grouting is still more than 15m 3 In the time of/h, a grouting hole is additionally arranged in front of the working face until the water inflow is lower than 15m 3 /h。
In the step 3-2), the grouting and water shutoff mode is to install orifice pipes; when the orifice pipe is installed, jute is uniformly wound, a flange is installed at the end part, and a steel pipe for connecting a grouting pipe, a high-pressure cut-off valve and a pressure gauge is welded at the position 300mm away from the end part; and (3) sealing the orifice pipe by using double slurry, and plugging water in grouting operation.
3-3) tunneling by adopting short probe water, wherein the control range is 5m in front of the tunnel, the left side wall 10 and the right side wall 11 of the tunnel are 3.0m respectively, and the top plate 12 and the bottom plate 9 of the tunnel are 2.5m respectively; the length of the short water detection hole is 5m, the allowed tunneling distance is 3m, if the water inflow is less than 10m 3 And (3) continuously tunneling the tunnel during the period of/h, if the water inflow is more than 10m 3 In the process of/h, grouting holes are added on the working surface of the roadway, grouting and water shutoff are carried out until the water inflow is reduced to 10m 3 And (3) stopping grouting below/h, and recovering the tunneling construction.
In the step 3-3), the grouting and water shutoff modes are as follows: and (5) installing a drill bit of a drilling machine, punching to 5m, installing an orifice pipe, and grouting and water shutoff.
4) And (5) adopting a long-detection water hole grouting tunneling roadway for construction.
And 4) the construction steps of grouting and tunneling the tunnel through the long detection water hole in the step 4) are the same as those in the steps 3-1) and 3-2), and grouting and water plugging are carried out on the long detection water hole.
5) Grouting and reinforcing construction.
5-1) grouting equipment selection, wherein a grouting station is arranged at a distance of 5m from a working surface, and a 2TGZ60/210 type high-pressure grouting pump is arranged in the grouting station;
5-2) grouting mode and grouting hole arrangement: grouting and water plugging are carried out by adopting a tunnel segmentation forward grouting mode, the grouting segmentation length is 50m, the virtual slag of the tunnel face is cleaned, guide grouting holes are arranged, and water detection holes and pore diameters are arranged according to the fracture grade and the section size(use->Drilling by a drill bit, fixing a 1-inch pipe), and ensuring the depth of the hole to be 5m;
5-3) selecting and arranging the number of grouting holes: 6 fan-shaped radial grouting holes are respectively 13, 14, 15, 16, 17 and 18 at the outer edge of the roadway, and the hole spacing and the row spacing are 1.48-2.0 m;
5-4) determining grouting material: the grouting material uses 425# ordinary Portland cement, the concentration of water glass is 40Be, and the modulus is 3.0; the volume ratio of the cement slurry to the water glass slurry is 1:0.5-0.8; cement slurry water cement ratio initial concentration is 2:1;
5-5) determining grouting pressure: initial grouting pressure P a ＝P o +(0.3～0.5)MPa，P o Is hydrostatic pressure, normal pressure P b ＝P o + (0.5-0.8) MPa, final pressure P c ＝2P o MPa；
5-6) slurry injection amount: the slurry injection quantity V is roughly calculated according to the diffusion radius and the rock fracture rate, and the calculation formula is as follows:
taking 1.5 of the A-slurry consumption coefficient; r is the slurry diffusion radius, and 2m is taken; h-is the height of the grouting section; η—rock fracture rate; beta-slurry filling coefficient, taking 0.85; m-calculus rate, 0.85;
5-7) grouting end: the grouting pressure reaches the design final pressure value, the injection quantity is less than 50-60L/min, the grouting is stable for more than 20 minutes, and the grouting is finished.
The method is aimed at the water inflow condition of the tunnel roof, divides the water inflow amount into two types, covers the construction method adopted by the tunnel working face in a large-to-small range, breaks through the limitation of a single construction water shutoff process, meets the urgent need of a sudden comprehensive water inflow treatment scheme in the tunnel tunneling construction field, and has the advantages of safety, reliability, short construction period, practicability and high efficiency.
Claims (6)
1. The long-detection-short-detection-grouting combined water control method based on water inflow classification is characterized by comprising the following steps of:
1) The water inflow is divided into two categories of I and II according to the water inflow of the roadway working surface:
the two categories are specifically:
i: the water inflow of the roadway working surface is more than or equal to 15m 3 /h；
II: the water inflow of the roadway working surface is less than 15m 3 /h；
2) Judging the class of the water inflow of the roadway working surface, and if the water inflow belongs to class I, entering step 3); if the two types belong to the II type, the step 4) is entered;
3) Grouting and tunneling roadway construction by adopting long-exploring-short-exploring water holes;
the step 3) comprises the following specific steps:
3-1) firstly chiseling bare rock on a working surface of a roadway, selecting five parts of the axial front part of the roadway, the left side wall of the roadway, the right side wall of the roadway, the top plate of the roadway and the bottom plate of the roadway by using a down-the-hole drill according to construction conditions and water gushing conditions, respectively drilling water detection holes with the length of 50m, the diameter of 120mm and the horizontal slope angle of 6 degrees, enabling the tunneling depth to be 45m, enabling the left side wall of the roadway and the right side wall of the roadway to be 20m respectively, enabling the top plate of the roadway and the bottom plate of the roadway to be 15m respectively, and reserving secondary water detection safety barriers to take values of 5m;
3-2) judging the water inflow of the working surface, if the water inflow exceeds 15m 3 And (h) plugging water by adopting a mode of water detection and grouting at the same time, so that the water inflow of the working surface is lower than 15m 3 And/h, if the water inflow after grouting is still more than 15m 3 In the time of/h, a grouting hole is additionally arranged in front of the working face until the water inflow is lower than 15m 3 /h；
3-3) tunneling by adopting short probe water, wherein the control range is 5m in front of the tunnel, the left side wall and the right side wall of the tunnel are respectively 3.0m, and the top plate and the bottom plate of the tunnel are respectively 2.5m; the length of the short water detection hole is 5m, and tunneling is allowedThe distance is 3m, if the water inflow is less than 10m 3 And (3) continuously tunneling the tunnel during the period of/h, if the water inflow is more than 10m 3 In the process of/h, grouting holes are added on the working surface of the roadway, grouting and water shutoff are carried out until the water inflow is reduced to 10m 3 Stopping grouting below/h, and recovering tunneling construction;
4) And (5) adopting a long-detection water hole grouting tunneling roadway for construction.
2. The method for controlling water by combining long probe-short probe-grouting based on water inflow classification according to claim 1, wherein in the step 3-2), the grouting water shutoff mode is to install an orifice pipe; when the orifice pipe is installed, jute is uniformly wound, a flange is installed at the end part, and a steel pipe for connecting a grouting pipe, a high-pressure cut-off valve and a pressure gauge is welded at the position 300mm away from the end part; and (3) sealing the orifice pipe by using double slurry, and plugging water in grouting operation.
3. The water control method based on the combination of long probe and short probe grouting of water inflow classification as claimed in claim 1, wherein in the step 3-3), the grouting water shutoff mode is as follows: and (5) installing a drill bit of a drilling machine, punching to 5m, installing an orifice pipe, and grouting and water shutoff.
4. The water control method based on the combination of long detection, short detection and grouting of water inflow classification as claimed in claim 1, wherein the step of grouting and tunneling the tunnel through the long detection water hole in the step 4) is similar to the steps of 3-1) and 3-2), and then grouting and water shutoff are carried out on the long detection water hole.
5. The method for controlling water by combining long detection and short detection and grouting based on water inflow classification according to claim 1, wherein in the step 3) and the step 4), 425# Portland cement is used as a grouting material, 40 DEG Be is used as water glass, and the modulus is 3.0; the volume ratio of the cement slurry to the water glass slurry is 1:0.5-0.8; cement slurry water cement ratio initial concentration is 2:1.
6. The water control method based on the combination of long probe and short probe grouting of water inflow classification of claim 1, further comprising a step 5) of grouting reinforcement construction:
5-1) grouting equipment selection, wherein a grouting station is arranged at a distance of 5m from a working surface, and a 2TGZ60/210 type high-pressure grouting pump is arranged in the grouting station;
5-2) grouting mode and grouting hole arrangement: grouting and water plugging are carried out by adopting a tunnel segmentation forward grouting mode, the grouting segmentation length is 50m, the virtual slag of the tunnel face is cleaned, guide grouting holes are arranged, and water detection holes and pore diameters are arranged according to the fracture grade and the section sizeThe hole depth is 5m;
5-3) selecting and arranging the number of grouting holes: 6 fan-shaped radial grouting holes are distributed at the outer edge of the roadway, and the hole spacing and the row spacing are 1.48-2.0 m;
5-4) determining grouting material: the grouting material uses 425# Portland cement, the water glass concentration is 40 Bes, and the modulus is 3.0; the volume ratio of the cement slurry to the water glass slurry is 1:0.5-0.8; cement slurry water cement ratio initial concentration is 2:1;
5-5) determining grouting pressure: initial grouting pressure P a ＝P o +(0.3～0.5)MPa，P o Is hydrostatic pressure, normal pressure P b ＝P o + (0.5-0.8) MPa, final pressure P c ＝2P o MPa；
5-6) slurry injection amount: the slurry injection quantity V is roughly calculated according to the diffusion radius and the rock fracture rate, and the calculation formula is as follows:
a-slurry consumption coefficient; r—slurry diffusion radius; h-is the height of the grouting section; η—rock fracture rate; beta-slurry filling factor; m-calculus rate;
5-7) grouting end: the grouting pressure reaches the design final pressure value, the injection quantity is less than 50-60L/min, the grouting is stable for more than 20 minutes, and the grouting is finished.
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