CN112174572B - Composite material for adsorbing gas overflowing from tunnel face and construction method thereof - Google Patents
Composite material for adsorbing gas overflowing from tunnel face and construction method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 27
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- 239000011435 rock Substances 0.000 claims abstract description 54
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 38
- 239000004088 foaming agent Substances 0.000 claims description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 26
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000002562 thickening agent Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 230000008719 thickening Effects 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
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- 239000000084 colloidal system Substances 0.000 claims description 7
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- 239000008098 formaldehyde solution Substances 0.000 claims description 7
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims description 7
- 238000005187 foaming Methods 0.000 claims description 6
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- 238000005422 blasting Methods 0.000 claims description 4
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/12—Condensation polymers of aldehydes or ketones
- C04B26/125—Melamine-formaldehyde condensation polymers
-
- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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Abstract
The invention discloses a composite material for adsorbing gas overflowing from a tunnel face and a construction method thereof, and relates to the technical field of tunnel construction. According to the invention, the activated carbon composite material is injected into the rock stratum at the rear part of the tunnel face in advance, so that the gas concentration in the surrounding rock can be reduced before excavation exposure, the risk of gas outburst in the excavation process of the tunnel face is effectively reduced, the gas release amount after rock excavation exposure is reduced, the initiative and the effectiveness are better, and the potential safety hazard of tunnel construction is reduced.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a composite material for adsorbing gas overflowing from a tunnel face and a construction method thereof.
Background
With the expansion of the scale and the increase of the number of the tunnel construction, more and more tunnels penetrate through mountains of a gas accumulation area, and the gas safety problem is increasingly prominent. The tunnel gas emission is mainly disclosed from rock strata on the tunnel face, and various catastrophic results such as poisoning, suffocation, burning, explosion and the like can be caused. According to different gas occurrence forms, the gas emission forms include slow permeation, fast emission, outburst and the like, wherein the outburst is the strongest and the most harmful. The excavation exposure area during the construction of highway and railway tunnels is large, factors such as blasting, mechanical vibration and the like in the construction process can comprehensively cause the gas overflow quantity to be increased, the gas is difficult to dissipate in a closed underground environment, concentration exceeds the standard due to easy accumulation, the normal breathing of construction operators is threatened, and even explosion is induced, so that the gas management and control in the tunnel construction are very critical. At present, ventilation is the most main way for ensuring the construction safety of a gas tunnel, but in the press-in type or roadway type ventilation commonly used in tunnel engineering, dirty wind is discharged out of the tunnel along the tunnel in an open airflow mode, so that harmful media such as dust, gas and the like are in an open type directional diffusion state, and the whole tunnel is in a toxic and harmful gas environment for a long time. Especially when the face gas gushes out the volume greatly, a large amount of gas directly flows outwards along the tunnel, has calamity diffusion hidden danger.
Aiming at the potential hazard caused by overlarge gas emission when the tunnel face is exposed, the current method mainly aims at advancing geological drilling and advancing gas emission through a drill hole so as to reduce the gas emission when the tunnel face is excavated. However, the gas still diffuses into the tunnel interior in the form of gas. Advanced emissions are also dangerous when the gas content in the formation is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a composite material for adsorbing gas overflowing from a tunnel face and a construction method thereof, aiming at the defects of the prior art, the composite material is convenient to construct, can actively adsorb gas overflowing from surrounding rocks in the tunnel face, and ensures the safety of tunnel construction.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the composite material for adsorbing gas overflowing from a tunnel face comprises activated carbon fibers, a thickening agent and a foaming agent, wherein the mass ratio of the activated carbon fibers to the thickening agent is 1: 3-1: 6, mixing the activated carbon fiber with a thickening agent to obtain a thickened solution, wherein the mass ratio of the thickened solution to the foaming agent is 20: 1-40: 1.
preferably, the thickening agent is prepared by mixing melamine formaldehyde solution and water in a mass ratio of 1: 2-1: 5, mixing the components.
Preferably, the fiber diameter of the activated carbon fiber is 10-13 microns.
Preferably, the blowing agent is a one-component polyurethane foam.
The invention also provides a construction method of the composite material for adsorbing gas overflowing from the tunnel face, which comprises the following steps:
preparing a composite material: mixing activated carbon fiber and a viscous agent according to a proportion to form a thickened solution containing activated carbon; weighing the thickening solution containing the active carbon and a foaming agent in proportion for later use;
(II) injecting the composite material into the surrounding rock of the tunnel face, wherein the injecting steps are as follows:
(1) excavating a tunnel face and detecting gas: performing blasting and excavation operation on surrounding rocks, estimating the level of the overflow amount of gas through a gas detection system and equipment when excavating to a tunnel face according to a construction plan, and observing the development degree of rock mass gaps in coal-series rock masses;
(2) sealing the palm surface: when the gas overflow amount of the face is large, spraying an airtight concrete layer with the thickness of 5-10 cm on the face to seal the gas;
(3) mounting an advanced drilling hole and a sleeve valve pipe: drilling holes in advance on the airtight concrete layer at intervals of 1.0-2.0 m, wherein the drilled holes extend into surrounding rocks; installing the sleeve valve pipe in the advanced drill hole, and filling and compacting a gap between the exposed end of the sleeve valve pipe and the airtight concrete layer by adopting plastic cement; a plurality of grout overflow holes are pre-drilled in the side wall of the sleeve valve pipe;
(4) respectively injecting the prepared thickening solution containing the active carbon and a foaming agent into a first slurry tank and a second slurry tank of a double-liquid grouting pump, starting the double-liquid grouting pump, injecting the thickening solution containing the active carbon and the foaming agent into an air chamber of the double-liquid grouting pump, and stirring and foaming under the action of air to prepare the colloid foam active carbon composite material;
(5) and (3) tunnel face advanced injection: starting a double-liquid grouting pump to inject the activated carbon composite material into the sleeve valve pipe along the grouting pipe according to the grouting pressure of 0.5-1.0 MPa, and enabling the activated carbon composite material to enter a rock mass gap of the coal-series rock mass surrounding rock along a grout overflow hole in the side wall of the sleeve valve pipe; when the specified injection amount in each sleeve valve tube is reached, the process can be finished; the end part of the sleeve valve pipe is provided with a grout stop plug.
Preferably, the double-liquid grouting pump is connected with the sleeve valve pipe through a slurry pipe, one end of the slurry pipe is connected with an outlet of the double-liquid grouting pump through a first connector, and the other end of the slurry pipe is connected with the end part of the sleeve valve pipe through a second connector.
Preferably, the double-liquid grouting pump comprises a pump body, a first slurry tank and a second slurry tank, wherein a mixing chamber and an air chamber are arranged in the pump body, and the first slurry tank and the second slurry tank are respectively used for containing a thickened solution containing activated carbon and a foaming agent; first thick liquids jar, second thick liquids jar all communicate with the mixing chamber, the discharge gate and the air chamber intercommunication of mixing chamber, the discharge gate and the first joint of air chamber link to each other.
Preferably, the air chamber is connected to an air pump for agitating the thickened solution containing activated carbon and the foaming agent into the air chamber to sufficiently foam the solution.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the active carbon composite material is prepared by mixing the active carbon fiber with a thickening agent and a foaming agent; the active carbon is utilized to fully adsorb free gas in a rock stratum, and a colloid covering layer is formed on the surface of a rock mass, so that the aim of persistently and effectively inhibiting the gas from gushing out is fulfilled. The construction method is convenient to construct, the activated carbon composite material is injected into the rock stratum at the rear part of the tunnel face in advance, the gas concentration in the surrounding rock can be reduced before excavation exposure, the risk of gas outburst in the excavation process of the tunnel face is effectively reduced, the gas release amount after the excavation exposure of the rock mass is reduced, the initiative and the effectiveness are better, and the potential safety hazard of tunnel construction is reduced.
Drawings
FIG. 1 is a diagram illustrating an operation of a grouting apparatus according to an embodiment of the present invention;
FIG. 2 is a sectional view A-A of FIG. 1;
in the figure: 1. the concrete grouting device comprises a first slurry tank, a second slurry tank, a third slurry tank, an active carbon composite material, a fourth slurry tank, a fifth slurry tank, a sixth slurry tank, a fifth slurry tank, a sixth slurry tank, 41, a mixing chamber, 42, an air chamber, 43, an air pump, 5, a slurry injection pipe, 51, a first connector, 52, a sixth connector, 6, a sleeve valve pipe, 7, a drill hole, 8, plastic cement, 9, surrounding rock, 10, a tunnel face, 11, surrounding rock gaps, 12, coal-series rock masses, 13, gas, 14 and an airtight concrete layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and completely understood, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings and specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a composite material for adsorbing gas overflowing from a tunnel face, which comprises activated carbon fibers, a thickening agent and a foaming agent, wherein the mass ratio of the activated carbon fibers to the thickening agent is 1: 3-1: 6, mixing the activated carbon fiber with a thickening agent to obtain a thickened solution, wherein the mass ratio of the thickened solution to the foaming agent is 20: 1-40: 1. when the composite material is manufactured, the specific requirements of the used activated carbon fiber, the viscous agent and the foaming agent are as follows:
(1) activated carbon fiber: the high-performance gas adsorption material is prepared by pyrolyzing and activating carbon-containing raw materials such as wood, coal, petroleum coke and the like, has the advantages of fiber diameter of 10-13 microns generally, large external surface area, rich and narrow micropores, easiness in contact with gas, small diffusion resistance, high adsorption speed and extremely strong adsorption capacity on low-concentration methane.
(2) A thickening agent: mixing melamine formaldehyde solution and water according to the ratio of 1: 3, and the purpose is to enable the activated carbon fiber to be cemented into a skeleton structure with certain porosity. Wherein, the mass ratio of melamine formaldehyde solution and water is determined according to the crack characteristics inside the tunnel surrounding rock, and the value range is 1: 2-1: 5, when the crack opening degree is small or the crack filling degree is high, the water ratio should be increased appropriately.
(3) The foaming agent is a single-component polyurethane foaming agent, is stored in a pressure-resistant aerosol can before use, and after being sprayed out, the foamed polyurethane material can be rapidly expanded and can be subjected to curing reaction with air to form foam.
The specific steps of preparing the composite material comprise weighing, mixing, foaming and curing. The following is a preparation procedure of the activated carbon composite in one embodiment:
firstly, mixing activated carbon fiber and a thickening agent according to the ratio of 1: 5, blending to form a thickened solution with a certain concentration of activated carbon fibers. Firstly, calculating the mass of gas to be adsorbed according to the gas content of a unit volume rock body in a surrounding rock, the excavation area of a tunnel face and the advanced injection depth; and then calculating the required mass of the activated carbon fiber according to the adsorption ratio of the activated carbon fiber to the gas.
Then, the thickened solution containing activated carbon was mixed with a foaming agent in a ratio of 30: 1 mass ratio, and carrying out physical mechanical stirring foaming under air operation to prepare the colloid foam active carbon composite material. The obtained activated carbon composite material finally forms a porous material with a three-dimensional net structure. The active carbon composite material prepared by the formula is mainly suitable for coal-series stratums with low rock stratum water content and rich gas. The active carbon composite material is injected into the surrounding rock on the tunnel face of the tunnel in advance through the sleeve valve pipe.
The invention also provides a construction method of the composite material for adsorbing gas overflowing from the tunnel face, which specifically comprises the following steps:
preparing a composite material: mixing activated carbon fiber and a viscous agent according to a proportion to form a thickened solution containing activated carbon; weighing the thickening solution containing the active carbon and a foaming agent in proportion for later use;
(II) injecting the composite material into the surrounding rock of the tunnel face, wherein the injecting steps are as follows:
(1) excavating the tunnel face and detecting gas. Blasting and excavating operation is carried out on the surrounding rock 9, when the tunnel face 10 is excavated according to a construction plan, the level of the overflow amount of the gas 13 is evaluated through a gas detection system and equipment, and the development degree of the rock mass gap 11 of the surrounding rock in the coal-series rock mass 12 is observed.
(2) The palm surface is sealed. When the gas overflow amount of the palm surface is large, airtight concrete with the thickness of 5-10 cm is sprayed on the palm surface before the sleeve valve pipe is drilled and installed, and the gas 13 is sealed.
(3) The advanced drilling hole and the sleeve valve pipe are installed. According to the development degree of the gap in the coal-series rock mass 12, the diffusion range of the sleeve valve pipe is evaluated, for example, when the influence range is 0.5-1.0 m, the distance between the advance drill holes 7 is designed to be 1.0-2.0 m. After the advance drill hole 7 is drilled, the sleeve valve tube 6 is installed, and the gap between the exposed end of the sleeve valve tube 6 and the airtight concrete layer 14 is filled and compacted by adopting the plastic cement 8.
(4) The base material for preparing the active carbon composite material comprises a solution A and a solution B, wherein the solution A is a thickened solution formed by blending active carbon fibers and a thickening agent, and the solution B is a foaming agent. And determining the preparation proportion according to the arrangement interval of the advanced drilling holes 7 and the emission quantity level of the tunnel gas 12. In one specific embodiment, the mass ratio of the thickening agent melamine formaldehyde solution to water is 1: 3; the mass ratio of the activated carbon fiber to the viscous agent is 1: 5; the mass ratio of the thickening solution to the foaming agent is 30: 1. the preparation process comprises the following steps:
1) and (5) weighing. Calculating and weighing the activated carbon fiber with mass m; weighing 5/4m of melamine formaldehyde solution and 15/4m of water, and uniformly mixing to form 5m of viscous agent; weighing 1/5mIs injected into the second slurry tank 2.
2) And (4) mixing. Mass ofmActivated carbon fiber and mass 5mThe viscous agent is fully mixed to form a homogeneous activated carbon fiber thickening solution 1, the homogeneous activated carbon fiber thickening solution 1 is injected into the first slurry tank 1, and the mass of the activated carbon fiber thickening solution is 6m。
3) And (4) foaming. Mixing at the two-fluid grouting pump 4A mass 6 in the chamber 41mActivated carbon fiber thickening solution 1 and 1/5mThe foaming agent 2 of (a) is mixed to form a mixed slurry containing multiphase components.
4) And (5) curing. The mixed slurry is introduced into the air chamber 42 of the two-fluid grouting pump 4, and the air pump 43 continuously introduces air into the mixed slurry in the air chamber 42, and the mixture is sufficiently stirred to form the activated carbon composite 3 in a colloidal foam state.
(5) The tunnel face is injected in advance. The two-fluid grouting pump is connected with one end of the grouting pipe 5 by a first joint 51, and the other end of the grouting pipe 5 is connected with the sleeve valve pipe 6 of the tunnel face 9 by a second joint 52. The activated carbon composite material 3 enters the sleeve valve pipe 6 through the grouting pipe 5 and then enters the rock mass gap 11 of the coal-series rock mass 12 through the grout overflow holes uniformly distributed on the sleeve valve pipe 6. After a certain amount of the activated carbon composite material 3 is injected according to a certain grouting pressure, the grouting pressure is generally controlled to be 0.5-1.0 MPa. The end of the sleeve valve tube 6 is provided with a grout stop which can withstand grouting pressure. Controlling the material injection amount, namely finishing when the specified injection amount in each sleeve valve pipe is reached; if the orifice pressure has reached the predetermined pressure value but the injection amount is still insufficient, the injection should be stopped.
(6) And (5) checking the injection effect. After the injection is finished, the injection effect should be checked, and if the injection effect does not meet the requirement, hole patching injection should be performed. Analyzing the injection record to see whether the injection pressure and the injection amount of each hole meet the design requirements or not, estimating the diffusion radius according to the injection amount of the material, and analyzing whether the diffusion radius is consistent with the design or not.
After the above operation, the activated carbon composite material 3 effectively absorbs the gas 13 in the rock body gap 11 of the surrounding rock within a certain period of time, and the covered coal-based rock body 12 plays a role in suppressing the gas 13 from gushing out. And continuously tunneling the tunnel face. And after the concentration of the gas in the rock mass is reduced, excavating and supporting operation is carried out, and the tunnel face continues to be excavated.
The following is a preparation procedure of an activated carbon composite in another example:
1. mixing activated carbon fiber and a thickening agent according to the ratio of 1: 3, blending the mixture according to a certain mass ratio to form a thickened solution with a certain concentration of the activated carbon fiber. Wherein the diameter of the activated carbon fiber is 13 micrometers; the thickening agent is prepared from melamine formaldehyde solution and water according to the proportion of 1: 5 by mass ratio.
2. Mixing the thickening solution containing the activated carbon with a foaming agent according to the ratio of 20: 1 mass ratio, and carrying out physical mechanical stirring foaming under air operation to prepare the colloid foam active carbon composite material. The active carbon composite material is injected into the surrounding rock on the tunnel face of the tunnel in advance through the sleeve valve pipe.
The colloid foam-shaped active carbon composite material has the following beneficial effects of absorbing gas overflowing from the surrounding rock gap:
(1) the activated carbon material has good adsorption capacity on methane and other gas components, high adsorption rate, long service life, simple preparation method and low material cost, and is suitable for large-scale production.
(2) After the active carbon composite material is injected into a gas-containing rock stratum through a grouting pipeline, karst fractures or cavities can be blocked, free gas in the rock stratum is fully adsorbed by using active carbon, and a colloid covering layer is formed on the surface of a rock body, so that the aim of persistently and effectively inhibiting gas from gushing out is fulfilled.
(3) Compared with ventilation measures, the active carbon composite material is injected into rock strata behind the face in advance, so that the gas concentration in surrounding rock can be reduced before excavation exposure, the risk of gas outburst in the excavation process of the face is effectively reduced, the gas release amount after rock excavation exposure is reduced, and the active and effective effects are achieved.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a combined material for adsorbing face spills over gas which characterized in that: the foaming agent comprises activated carbon fibers, a thickening agent and a foaming agent, wherein the mass ratio of the activated carbon fibers to the thickening agent is 1: 3-1: 6, mixing the activated carbon fiber with a thickening agent to obtain a thickened solution, wherein the mass ratio of the thickened solution to the foaming agent is 20: 1-40: 1; the fiber diameter of the activated carbon fiber is 10-13 microns; the thickening agent is prepared from a melamine formaldehyde solution and water according to a mass ratio of 1: 2-1: 5, mixing the components; the foaming agent is a single-component polyurethane foaming agent, is stored in a pressure-resistant aerosol can before use, and after the foaming agent is sprayed out, the foamed polyurethane material quickly expands and is subjected to curing reaction with air to form foam.
2. The construction method of the composite material for adsorbing the gas overflowing from the tunnel face is characterized by comprising the following steps of:
preparing a composite material: the composite material is as defined in claim 1
The composite material for adsorbing the gas overflowing from the face is prepared by mixing activated carbon fiber and a thickening agent in proportion to form a thickened solution containing activated carbon; weighing the thickening solution containing the active carbon and a foaming agent in proportion for later use;
(II) injecting the composite material into the surrounding rock of the tunnel face, wherein the injecting steps are as follows:
(1) excavating a tunnel face and detecting gas: performing blasting and excavation operation on surrounding rocks, estimating the level of the overflow amount of gas through a gas detection system and equipment when excavating to a tunnel face according to a construction plan, and observing the development degree of rock mass gaps in coal-series rock masses;
(2) sealing the palm surface: when the gas overflow amount of the face is large, spraying an airtight concrete layer with the thickness of 5-10 cm on the face to seal the gas;
(3) mounting an advanced drilling hole and a sleeve valve pipe: drilling holes in advance on the airtight concrete layer at intervals of 1.0-2.0 m, wherein the drilled holes extend into surrounding rocks; installing the sleeve valve pipe in the advanced drill hole, and filling and compacting a gap between the exposed end of the sleeve valve pipe and the airtight concrete layer by adopting plastic cement; a plurality of grout overflow holes are pre-drilled in the side wall of the sleeve valve pipe;
(4) respectively injecting the prepared thickening solution containing the active carbon and a foaming agent into a first slurry tank and a second slurry tank of a double-liquid grouting pump, starting the double-liquid grouting pump, injecting the thickening solution containing the active carbon and the foaming agent into an air chamber of the double-liquid grouting pump, and stirring and foaming under the action of air to prepare the colloid foam active carbon composite material;
(5) and (3) tunnel face advanced injection: starting a double-liquid grouting pump to inject the activated carbon composite material into the sleeve valve pipes along the grouting pipes according to the grouting pressure of 0.5-1.0 MPa, and entering rock mass gaps of surrounding rocks of the coal-series rock masses along the grout overflow holes in the side walls of the sleeve valve pipes; when the specified injection amount in each sleeve valve tube is reached, the process can be finished; the end part of the sleeve valve pipe is provided with a grout stop plug.
3. The construction method of the composite material for adsorbing the gas overflowing from the tunnel face as claimed in claim 2, wherein: the biliquid grouting pump passes through the thick liquids pipe and links to each other with the sleeve valve pipe, the one end of thick liquids pipe links to each other through the export of first joint and biliquid grouting pump, and the other end passes through the second and connects the tip with the sleeve valve pipe and link to each other.
4. The construction method of the composite material for adsorbing the gas overflowing from the tunnel face according to claim 3, wherein the construction method comprises the following steps: the double-liquid grouting pump comprises a pump body, a first slurry tank and a second slurry tank, wherein a mixing chamber and an air chamber are arranged in the pump body, and the first slurry tank and the second slurry tank are respectively used for containing a thickened solution containing activated carbon and a foaming agent; first thick liquids jar, second thick liquids jar all communicate with the mixing chamber, the discharge gate and the air chamber intercommunication of mixing chamber, the discharge gate and the first joint of air chamber link to each other.
5. The construction method of the composite material for adsorbing the gas overflowing from the tunnel face as claimed in claim 4, wherein: the air chamber is connected with an air pump and used for stirring the thickening solution containing the activated carbon and the foaming agent which enter the air chamber until the thickening solution and the foaming agent are fully foamed.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110204287A (en) * | 2019-04-28 | 2019-09-06 | 中德新亚建筑材料有限公司 | A kind of high intensity fast hardening concrete and preparation method thereof |
| CN112459010A (en) * | 2020-11-02 | 2021-03-09 | 张甜甜 | Hydraulic engineering concrete dam leakage-repairing reinforcing grouting method |
| CN213331105U (en) * | 2020-08-14 | 2021-06-01 | 中铁十六局集团铁运工程有限公司 | Composite lining structure of gas tunnel |
| CN213360120U (en) * | 2020-08-14 | 2021-06-04 | 中铁十六局集团铁运工程有限公司 | Transition structure for adsorbing gas overflowing from tunnel face |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666234B (en) * | 2009-10-09 | 2011-06-22 | 中铁二局股份有限公司 | Fracture rock no-slurry-blocking wall compound grouting construction method |
| CN101994513B (en) * | 2010-10-30 | 2013-01-02 | 中铁十二局集团第二工程有限公司 | Method for constructing tunnel by finishing full section curtain grouting from upper-half section |
| CN103334770B (en) * | 2013-06-09 | 2015-08-12 | 中铁隧道集团有限公司 | One is grown up reverse-slope tunnel ultra high water pressure rich water zone of fracture construction method |
| CN103362532B (en) * | 2013-06-28 | 2015-06-24 | 中国矿业大学 | Method for preparing active-carbon-containing colloid gas foam for preventing gas emission in gob |
| CN106968675A (en) * | 2017-03-20 | 2017-07-21 | 中铁十五局集团有限公司 | The construction method in gas tunnel goaf |
| CN107642360B (en) * | 2017-07-25 | 2022-06-10 | 北京瑞威世纪铁道工程有限公司 | Full-section advanced pre-grouting construction method |
| CN110985030B (en) * | 2019-12-06 | 2021-05-04 | 中铁隧道局集团有限公司 | Single-arm variable-wheelbase double-shaft water mill drilling mechanism |
| CN111119983B (en) * | 2019-12-30 | 2021-07-02 | 中铁六局集团天津铁路建设有限公司 | Gas spraying and burning treatment method in tunnel excavation process |
| CN112177657B (en) * | 2020-08-14 | 2022-07-22 | 中铁十六局集团铁运工程有限公司 | Sectional type ventilation system for long-distance tunnel and implementation method thereof |
-
2020
- 2020-09-03 CN CN202010917650.8A patent/CN112174572B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110204287A (en) * | 2019-04-28 | 2019-09-06 | 中德新亚建筑材料有限公司 | A kind of high intensity fast hardening concrete and preparation method thereof |
| CN213331105U (en) * | 2020-08-14 | 2021-06-01 | 中铁十六局集团铁运工程有限公司 | Composite lining structure of gas tunnel |
| CN213360120U (en) * | 2020-08-14 | 2021-06-04 | 中铁十六局集团铁运工程有限公司 | Transition structure for adsorbing gas overflowing from tunnel face |
| CN112459010A (en) * | 2020-11-02 | 2021-03-09 | 张甜甜 | Hydraulic engineering concrete dam leakage-repairing reinforcing grouting method |
Non-Patent Citations (3)
| Title |
|---|
| Gas adsorption properties materials and their applications in air purification;LIN,SY et al;《NEW CARBON MATERALS》;20151231;第30卷(第6期);第502-510页 * |
| 微生物注浆地基处理技术研究进展;吴创周等;《地基处理》;20200628(第03期);第9-14页 * |
| 煤岩瓦斯固气耦合相似材料瓦斯吸附特性研究;李树刚等;《采矿与安全工程学报》;20190515(第03期);第210-218页 * |
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