CN114412503A - Composite separation protection method for preventing landfill leachate from eroding tunnel lining structure - Google Patents
Composite separation protection method for preventing landfill leachate from eroding tunnel lining structure Download PDFInfo
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- CN114412503A CN114412503A CN202210093096.5A CN202210093096A CN114412503A CN 114412503 A CN114412503 A CN 114412503A CN 202210093096 A CN202210093096 A CN 202210093096A CN 114412503 A CN114412503 A CN 114412503A
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- layer
- tunnel
- grouting
- eroding
- tunnel lining
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- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 230000003628 erosive effect Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000926 separation method Methods 0.000 title claims abstract description 5
- 239000000149 chemical water pollutant Substances 0.000 title claims description 11
- 239000010410 layer Substances 0.000 claims abstract description 56
- 239000011435 rock Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 24
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 22
- 239000000440 bentonite Substances 0.000 claims abstract description 22
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000000903 blocking effect Effects 0.000 claims abstract description 18
- 229920000642 polymer Polymers 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000004888 barrier function Effects 0.000 claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 239000004746 geotextile Substances 0.000 claims abstract description 8
- 150000002500 ions Chemical class 0.000 claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 231100000331 toxic Toxicity 0.000 claims abstract description 6
- 230000002588 toxic effect Effects 0.000 claims abstract description 6
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 3
- 239000011268 mixed slurry Substances 0.000 claims abstract description 3
- 239000011378 shotcrete Substances 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 8
- 238000004078 waterproofing Methods 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- 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
- E21D11/383—Waterproofing; Heat insulating; Soundproofing; Electric insulating by applying waterproof flexible sheets; Means for fixing the sheets to the tunnel or cavity wall
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a composite barrier protection method for preventing leachate in a refuse dump from eroding a tunnel lining structure. The separation protective structure is composed of a grouting blocking layer and an adsorption protective layer. The grouting blocking layer is a rock-soil layer which is formed by mixing and high-pressure grouting reinforcement of broken loose surrounding rock mass through superfine cement and high polymer (hydrophilic acrylate) and has seepage-proofing and reinforcing effects, the mass mixing ratio range of the superfine cement and water in the mixed slurry of the superfine cement and the high polymer is 0.8-1.0, and the mass mixing ratio range of the high polymer and the water is 2-5%; the adsorption protection layer is formed by spraying a bentonite layer with the thickness of 3-6mm between the primary lining of the tunnel and the waterproof geotextile, has the function of adsorbing residual corrosive toxic and harmful ions, has the bentonite slurry ratio (mass ratio of bentonite to water) within the range of 1:5-1:10, and is doped with 5-8% of an accelerating agent.
Description
Technical Field
The invention relates to the field of safety of tunnel lining structures, in particular to a composite barrier protection method for preventing leachate in a refuse dump from eroding a tunnel lining structure.
Background
The rapid development of economy is often accompanied by a booming traffic project. The tunnel is an essential element in the construction of modern traffic infrastructure engineering, and particularly, the tunnel is a normal state when the tunnel is opened in mountains along with the fact that urban space land is less and less, and the requirement of people on traffic traveling efficiency is higher and higher. The tunnel seepage prevention comprises self-lining waterproofing and grouting waterproofing, wherein the grouting waterproofing mainly comprises the step of grouting rock and soil mass around the tunnel to fill pores, gaps, joint surfaces and the like so as to reduce the permeability coefficient of the rock and soil mass, so that the aim of waterproofing is fulfilled. The waterproof concrete is required to meet the relevant regulations of waterproof concrete in underground engineering technical Specifications. When the tunnel passes through a section which has abundant underground water and large water pressure and is not suitable for adopting a drainage measure, a composite lining is required, and for the tunnel with the moisture-proof requirement, a fully-closed waterproof lining structure is adopted.
However, underground tunnel engineering may also pass through a section rich in corrosive ions, such as a landfill site, high-chlorine underground water and the like, and the corrosion action of the components is very likely to cause the problems of concrete degradation, steel bar corrosion and the like, thereby threatening the safety of a tunnel lining structure. The anti-erosion design of the tunnel lining structure is an important field for guaranteeing the safety of the tunnel.
Application No. 201910172769.4 discloses a grouting method for a fine fractured rock mass, which is characterized in that bentonite cement and ordinary portland cement are adapted to prepare grouting slurry, but when the grouting slurry is used for plugging the fine fractured rock mass, the grouting quality is obviously influenced by the granularity of cement particles, and the cost is high by adopting super-particle slurry; the application No. 201010104839.1 discloses a method for grouting high polymer for tunnel protection, which is to inject expansive high polymer material into the cavity caused by the existence of dissolution cavity in the surrounding rock of the tunnel or tunnel collapse, but the construction cost is high when grouting in a large range, so the application is limited. Application No. 201410774377.2 discloses a composite barrier for blocking horizontal diffusion and migration of contaminants in a groundwater layer and an application thereof, which is composed of water-soluble polymer film encapsulated swelling clay for mainly blocking horizontal migration of contaminants in the groundwater layer.
Disclosure of Invention
The technical problem is as follows: the invention provides a composite separation protection method for preventing landfill leachate from eroding a tunnel lining structure, and aims to eliminate the influence of the landfill leachate on the safety of a lower tunnel lining structure. The method comprises the steps of injecting superfine cement and high polymer into a fractured rock mass by mixing and high-pressure grouting to realize plugging and blocking of seepage of landfill leachate along cracks, and then further isolating residual erosive toxic and harmful ions which permeate along rocks by means of high adsorbability of bentonite, so that the effect of preventing the tunnel reinforced concrete lining from being eroded and damaged is achieved.
The technical scheme is as follows: in order to solve the problems in the prior art, the composite barrier protection structure for preventing leachate of the refuse landfill from eroding the tunnel lining structure is composed of a grouting barrier layer and an adsorption protection layer, wherein the grouting barrier layer is positioned between tunnel surrounding rock and a tunnel sprayed concrete primary lining layer, and the grouting barrier layer is used for plugging rock mass cracks and reinforcing the surrounding rock mass; the adsorption protection layer is arranged between the tunnel primary lining sprayed concrete layer and the waterproof geotextile and aims to adsorb residual corrosive toxic and harmful ions penetrating through rocks; the tunnel lining structure is made to be as follows from outside to inside in sequence: the tunnel lining comprises a tunnel surrounding rock layer, a grouting blocking layer, a sprayed concrete primary lining layer, an adsorption protection layer, a waterproof geotextile layer and a cast concrete secondary lining layer.
Wherein: the grouting blocking layer is formed by reinforcing a broken loose surrounding rock body through superfine cement and high polymer mixed high-pressure grouting.
The mass mixing ratio of the superfine cement to the water in the mixed slurry of the superfine cement and the high polymer is 0.8-1.0, and the mass mixing ratio of the high polymer to the water is 2-5%.
The high polymer is hydrophilic acrylate.
The adsorption protective layer is bentonite with the thickness of 3-6 mm.
The bentonite slurry comprises the following components in percentage by mass: the water accounts for 1:5-1:10, and the mass mixing ratio of the accelerator to the bentonite slurry ranges from 5% to 8%.
Has the advantages that: the invention has the advantages that the composite barrier protection structure is adopted to realize the barrier and protection of the downward-penetrating tunnel lining structure eroded by the percolate of the overlying refuse landfill, and the long-term erosion resistance safety of the tunnel lining structure under the working condition of the downward-penetrating refuse landfill of the tunnel can be effectively ensured. The concrete points are as follows:
1) compared with the situation of pure ultrafine cement, the superfine cement and high polymer composite grouting has lower cost, and the addition of the high polymer material can improve the fluidity of grouting slurry and improve the grouting effect on one hand, and on the other hand, the hydrophilic high polymer material is easier to permeate into fine cracks than the superfine cement, so that the grouting difficulty is reduced, and the grouting quality is improved;
2) the bentonite is a green environment-friendly material, the impermeability of the bentonite with the thickness of 3-6mm is equivalent to 100 times of the impermeability of the clay with the thickness of 30-60cm, and meanwhile, the super-strong adsorbability of the bentonite can realize the adsorption and isolation of corrosive toxic and harmful ions, thereby realizing the high-efficiency protection of a reinforced concrete layer;
3) the construction of the bentonite adsorption protective layer adopts a high-pressure injection mode, the construction is convenient, no pollution is caused, and the construction is not influenced by weather such as air temperature and the construction environment.
Drawings
FIG. 1 is a schematic view of a tunnel lining structure for preventing leachate in a landfill from corroding.
Detailed Description
The embodiment of the invention will be described in combination with the embodiment of the invention in order to provide a composite barrier protection method for preventing landfill leachate from eroding a tunnel lining structure. It should be noted that the described embodiment is only one embodiment of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.
The specific implementation manner of the embodiment of the invention comprises the following steps:
the blocking protection structure consists of a grouting blocking layer and an adsorption protection layer, wherein the grouting blocking layer is positioned between tunnel surrounding rock and a tunnel sprayed concrete primary lining layer, and the layer aims at blocking rock body cracks and reinforcing surrounding rock bodies; the adsorption protection layer is arranged between the tunnel primary lining sprayed concrete layer and the waterproof geotextile and aims to adsorb residual corrosive toxic and harmful ions penetrating through rocks; the tunnel lining structure is made to be as follows from outside to inside in sequence: the tunnel lining comprises a tunnel surrounding rock layer, a grouting blocking layer, a sprayed concrete primary lining layer, an adsorption protection layer, a waterproof geotextile layer and a cast concrete secondary lining layer.
1) Firstly, after the primary lining layer of the sprayed concrete of the tunnel is hardened, grouting hole construction is carried out in the primary lining layer of the sprayed concrete of the tunnel and surrounding rocks, the depth of the grouting hole is controlled according to 0.6-1.2m, and a grout stopping device is fixed by using cement paste with low water cement ratio.
2) Secondly, preparing superfine cement slurry according to the mass ratio of the superfine cement to the water of 0.8-1.0, determining the using amount of the high polymer according to the water consumption of the superfine cement slurry and the mass ratio of the high polymer to the water of 2-5%, and adding the high polymer into the superfine cement slurry in batches to form grouting slurry required by a grouting barrier layer.
3) Thirdly, pressing cement high polymer grouting liquid into the surrounding rock body in a high-pressure grouting mode, wherein the grouting pressure is preferably 0.5-3.0 MPa, and specifically, the more complete the rock body is, the higher the pressure is, otherwise, the smaller the pressure is, the time is gradually controlled to be 20-30min, and the density of the grouting liquid is measured every 10 min.
4) And after the high-pressure grouting is finished, removing the grouting equipment, and plugging the grouting holes by using cement paste with a low water-cement ratio.
5) According to the proportion of bentonite: preparing bentonite slurry with the water mass ratio of 1:5-1:10, and then adding an accelerator, wherein the mass ratio of the accelerator to the bentonite slurry is 5-8%, so as to form slurry required by the adsorption protective layer.
6) And (3) adopting a sprayed concrete device, and uniformly spraying the bentonite slurry on the surface of the tunnel sprayed concrete primary lining layer in a high-pressure mode to form a bentonite layer with the thickness of about 3-6 mm.
7) And after the bentonite layer is solidified and hardened, hanging waterproof geotextile on the surface of the bentonite layer, and performing pouring concrete secondary lining integral construction by means of a trolley, thereby forming a complete tunnel lining structure.
Claims (6)
1. A composite separation protection method for preventing leachate in a refuse dump from eroding a tunnel lining structure is characterized by comprising the following steps: the blocking protection structure consists of a grouting blocking layer and an adsorption protection layer, wherein the grouting blocking layer is positioned between tunnel surrounding rock and a tunnel sprayed concrete primary lining layer, and the layer aims at blocking rock body cracks and reinforcing surrounding rock bodies; the adsorption protection layer is arranged between the tunnel primary lining sprayed concrete layer and the waterproof geotextile and aims to adsorb residual corrosive toxic and harmful ions penetrating through rocks; the tunnel lining structure is made to be as follows from outside to inside in sequence: the tunnel lining comprises a tunnel surrounding rock layer, a grouting blocking layer, a sprayed concrete primary lining layer, an adsorption protection layer, a waterproof geotextile layer and a cast concrete secondary lining layer.
2. The composite barrier protection method for preventing landfill leachate from eroding the tunnel lining structure according to claim 1, is characterized in that: the grouting blocking layer is formed by reinforcing a broken loose surrounding rock body through superfine cement and high polymer mixed high-pressure grouting.
3. The composite barrier protection method for preventing landfill leachate from eroding the tunnel lining structure, according to claim 2, is characterized in that: the mass mixing ratio of the superfine cement to the water in the mixed slurry of the superfine cement and the high polymer is 0.8-1.0, and the mass mixing ratio of the high polymer to the water is 2-5%.
4. The composite barrier protection method for preventing landfill leachate from eroding the tunnel lining structure, according to claim 3, is characterized in that: the high polymer is hydrophilic acrylate.
5. The composite barrier protection method for preventing landfill leachate from eroding the tunnel lining structure according to claim 1, is characterized in that: the adsorption protective layer is bentonite with the thickness of 3-6 mm.
6. The composite barrier protection method for preventing landfill leachate from eroding the tunnel lining structure, according to claim 5, is characterized in that: the bentonite slurry comprises the following components in percentage by mass: the water accounts for 1:5-1:10, and the mass mixing ratio of the accelerator to the bentonite slurry ranges from 5% to 8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210093096.5A CN114412503A (en) | 2022-01-26 | 2022-01-26 | Composite separation protection method for preventing landfill leachate from eroding tunnel lining structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210093096.5A CN114412503A (en) | 2022-01-26 | 2022-01-26 | Composite separation protection method for preventing landfill leachate from eroding tunnel lining structure |
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| Publication Number | Publication Date |
|---|---|
| CN114412503A true CN114412503A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210093096.5A Pending CN114412503A (en) | 2022-01-26 | 2022-01-26 | Composite separation protection method for preventing landfill leachate from eroding tunnel lining structure |
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| CN (1) | CN114412503A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059482A (en) * | 2022-06-02 | 2022-09-16 | 昆山市交通科技研究中心有限公司 | High-pressure rotary jet grouting preparation method for water-rich sand layer cement high polymer |
-
2022
- 2022-01-26 CN CN202210093096.5A patent/CN114412503A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059482A (en) * | 2022-06-02 | 2022-09-16 | 昆山市交通科技研究中心有限公司 | High-pressure rotary jet grouting preparation method for water-rich sand layer cement high polymer |
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