CN114809105A - In-situ horizontal multi-layer barrier construction method - Google Patents
In-situ horizontal multi-layer barrier construction method Download PDFInfo
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- CN114809105A CN114809105A CN202210218426.9A CN202210218426A CN114809105A CN 114809105 A CN114809105 A CN 114809105A CN 202210218426 A CN202210218426 A CN 202210218426A CN 114809105 A CN114809105 A CN 114809105A
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- 230000004888 barrier function Effects 0.000 title claims abstract description 131
- 238000010276 construction Methods 0.000 title claims abstract description 67
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 52
- 238000001179 sorption measurement Methods 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims description 88
- 239000003463 adsorbent Substances 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- 239000004113 Sepiolite Substances 0.000 claims description 5
- 229960000892 attapulgite Drugs 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 5
- 229910052625 palygorskite Inorganic materials 0.000 claims description 5
- 235000021317 phosphate Nutrition 0.000 claims description 5
- 229910052624 sepiolite Inorganic materials 0.000 claims description 5
- 235000019355 sepiolite Nutrition 0.000 claims description 5
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 10
- 231100000719 pollutant Toxicity 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002689 soil Substances 0.000 abstract description 7
- 230000008439 repair process Effects 0.000 abstract description 6
- 238000003895 groundwater pollution Methods 0.000 abstract description 5
- 230000008595 infiltration Effects 0.000 abstract description 3
- 238000001764 infiltration Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 238000003911 water pollution Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
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- -1 mercapto compound Chemical class 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000000149 chemical water pollutant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The disclosure relates to the technical field of groundwater pollution prevention and treatment, and particularly provides an in-situ horizontal multilayer barrier construction method, which comprises the steps of obtaining at least one target construction site; and constructing a multilayer horizontal barrier layer at each target construction point in at least one target construction site by using an ultrahigh pressure jet grouting injection system, wherein the multilayer horizontal barrier layer comprises at least two anti-seepage barrier layers and at least two adsorption reaction layers. According to the in-situ horizontal multilayer barrier construction method, the ultrahigh pressure rotary spraying injection system is introduced to construct the multilayer horizontal barrier layer for the polluted soil and the underground water, each layer of horizontal barrier layer is composed of the barrier layer and the adsorption or reaction layer, the underground water pollution problem caused by infiltration of pollutants in a non-regular refuse landfill and a polluted site is effectively isolated, deformation can be resisted, construction is simple, convenient and flexible, equipment is portable, maneuverability is strong, construction efficiency is high, and repair cost is low.
Description
Technical Field
The invention relates to the technical field of groundwater pollution prevention and control, in particular to an in-situ horizontal multilayer barrier construction method.
Background
Groundwater resources are important components of water resources, groundwater pollution in China is serious, the problem of water resource shortage which is short originally is made worse, serious threats and challenges are formed for the health of residents, the food safety, the drinking water safety, the regional ecological environment, the sustainable development of the economy and the society and even the social stability, and groundwater pollution risk control and restoration become environmental problems which are currently concerned by the public and the society.
When the regular landfill site is constructed, seepage-proofing treatment needs to be carried out on the side slope and the bottom of the landfill site, so that poisonous and harmful landfill leachate generated by later-stage stacked garbage is prevented from polluting underground water through underground soil infiltration, and the illegal landfill site and the polluted site are prevented from polluting the underground water due to the fact that the soil below is not subjected to special seepage-proofing treatment, and pollutants seeped out from the landfill leachate and the polluted site can infiltrate into an underground water layer along with the lapse of time, so that irreversible water pollution is caused to the local area.
For the groundwater pollution caused by the irregular landfill and the polluted site, the current common pollution control method mainly carries out in-situ and ex-situ remediation treatment on the polluted soil and the polluted groundwater respectively, and the in-situ remediation technology has the advantages of high removal efficiency, short remediation period, easiness in control of secondary pollution and the like due to the large ex-situ remediation engineering quantity, high cost and great influence on the ecological environment, and becomes one of the most used remediation technologies at present.
In the in-situ remediation in the prior art, the reaction medicament or the adsorption material and the like are used for adsorbing, precipitating, degrading and the like with pollutants underground, so that the effect of removing the pollutants is achieved, when the effective action of the reaction medicament or the adsorption material is used up, the pollutants are easy to rebound, the pollution degrees of all parts in the same pollution site are different, the dosage of the reaction medicament or the adsorption material is difficult to control, and the remediation cost is often beyond expectation.
Disclosure of Invention
The invention aims to provide an in-situ horizontal multilayer barrier construction method, which aims to solve the technical problems that in the prior art, when the effective action of a reaction medicament or an adsorption material is used up in the in-situ horizontal multilayer barrier construction process for a non-regular landfill site, the pollutants are easy to rebound or permeate, the pollution degrees of different parts of the same pollution site are different, the dosage of the reaction medicament or the adsorption material is difficult to control, and the repair cost is higher.
In order to achieve the aim, the technical scheme of the invention is that the in-situ horizontal multilayer barrier construction method comprises the following steps:
acquiring at least one target construction site;
and constructing a multilayer horizontal barrier layer at each target construction point in the at least one target construction site by using an ultrahigh pressure jet grouting injection system, wherein the multilayer horizontal barrier layer comprises at least two anti-seepage barrier layers and at least two adsorption reaction layers.
In some embodiments, constructing a multi-layer horizontal barrier layer at each target construction site of the at least one target construction site using an ultra-high pressure jet grouting injection system comprises:
drilling and guiding holes based on the target construction point positions;
based on a preset depth, drilling at the target construction point by using the ultrahigh-pressure jet grouting injection system;
generating the multi-layer horizontal barrier layer based on a target barrier material, a target adsorbent material/target reactive material, and the bore hole.
In some embodiments, the generating the multi-layer horizontal barrier layer based on the target barrier material, the target adsorbent material/target reactive material, and the borehole comprises:
injecting the target barrier material into the drilled hole at high pressure to form a first anti-seepage barrier layer meeting a preset thickness threshold, wherein the target barrier material is a barrier material containing anti-seepage slurry;
injecting the target adsorption material/the target reaction material into the drilled hole to form a first adsorption reaction layer with a preset thickness threshold, wherein the first anti-seepage barrier layer is positioned at the lower part of the first adsorption reaction layer;
injecting the target barrier material into the drilled hole at high pressure to form a second anti-seepage barrier layer meeting the preset thickness threshold;
and injecting the target adsorption material/the target reaction material into the drilled hole to form a second adsorption reaction layer with a preset thickness threshold, wherein the second anti-seepage barrier layer is positioned at the lower part of the second adsorption reaction layer.
In some embodiments, the ultrahigh pressure jet grouting injection system is constructed using a triple pipe method or an all-directional high pressure jet method.
In some embodiments, the pressure in the tube of the ultrahigh-pressure jet injection system is 30-55 MPa.
In some embodiments, the jet radius of the ultrahigh-pressure jet grouting injection system is not less than 1m, and the drilling verticality deviation is less than 0.5%.
In some embodiments, the materials of the first barrier layer and the second barrier layer comprise, in a mass ratio of 1: 1: 2 the attapulgite, the sepiolite and the cement are mixed, and the first layer of adsorption reaction layer and the second layer of adsorption reaction layer comprise adsorption materials of sulfhydryl compounds and phosphates.
In some embodiments, the time interval between injecting the target adsorbent material/target reactive material into the borehole to form a first layer of an adsorbent reactive layer with a preset thickness threshold and injecting the target barrier material into the borehole at high pressure to form a first layer of an impermeable barrier layer meeting the preset thickness threshold is greater than or equal to 8 minutes;
and injecting the target barrier material into the drilled hole at high pressure to form a second anti-seepage barrier layer meeting the preset thickness threshold value, and injecting the target adsorbing material/the target reaction material into the drilled hole to form a second adsorption reaction layer with the preset thickness threshold value, wherein the time interval between the second adsorption reaction layer and the target adsorbing material/the target reaction material is greater than or equal to 8 minutes.
In some embodiments, the first adsorptive-reactive layer, the second adsorptive-reactive layer, the first barrier layer, and the second barrier layer have a thickness of 0.1m to 0.5 m.
Compared with the prior art, the in-situ horizontal multilayer barrier construction method has the advantages that the ultrahigh pressure rotary spraying injection system is introduced to construct the multilayer horizontal barrier layer for the polluted soil and the underground water, each horizontal barrier layer is respectively composed of the barrier layer and the adsorption or reaction layer, the problem of underground water pollution caused by infiltration of pollutants in an irregular refuse landfill and a polluted site is effectively isolated for a long time, deformation can be resisted, the barrier layer cannot be invalid even if the non-uniform settlement exists locally, the construction is simple, convenient and flexible, the equipment is light and portable, the maneuverability is strong, the construction efficiency is high, injected materials can be accurately metered and controlled, and the repair cost is low.
Drawings
FIG. 1 is a schematic flow diagram of an in-situ horizontal multi-layer barrier construction method provided in accordance with an embodiment of the present disclosure;
FIG. 2 is another schematic flow diagram of an in-situ horizontal multi-layer barrier construction method provided in accordance with an embodiment of the present disclosure;
figure 3 is a schematic view of a process plan layout structure of an in-situ horizontal multi-layer barrier construction method provided according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow diagram of an in-situ horizontal multi-layer barrier construction method provided according to an embodiment of the present disclosure. As shown in fig. 1, an in-situ horizontal multi-layer barrier construction method includes the following steps:
step S101, at least one target construction site is obtained.
In some embodiments, the target construction site may be any one of a non-regular landfill site, a regular landfill site, and a general pollution site.
Step S102, aiming at each target construction point in at least one target construction site, constructing a multilayer horizontal barrier layer at the target construction point by using an ultrahigh pressure jet grouting injection system, wherein the multilayer horizontal barrier layer comprises at least two anti-seepage barrier layers and at least two adsorption reaction layers.
In some embodiments, for each target construction site of at least one target construction site of any one of the above-mentioned irregular landfill sites, regular landfill sites, and general contaminated sites, a multi-layer horizontal barrier layer 20 is constructed at the target construction site using the ultrahigh pressure jet grouting injection system 10. The number and the distribution condition of the target construction point positions can be set according to the size of the site. The multi-layered horizontal barrier layer 20 includes at least two barrier layers 201 and at least two reactive layers 202. The ultrahigh pressure rotary injection system 10 is constructed by a triple pipe method or an all-directional high pressure injection method. The anti-seepage barrier layer 201 adopts the ultrahigh pressure jet grouting injection system 10 to contain the components in the mass ratio of 1: 1: 2 injecting the barrier material of the seepage-proofing slurry formed by the attapulgite, the sepiolite and the cement which are uniformly mixed into the slurry at high pressure, and waiting for 10 minutes to form a seepage-proofing barrier layer 201 with the thickness of 0.3 m. The adsorption reaction layer 202 is formed by adopting the ultrahigh pressure jet grouting injection system 10 to form the adsorption reaction layer 202 with the thickness of 0.3m from slurry formed by the adsorption material containing the mercapto compound and the phosphate within the designed depth of the target construction site.
The in-situ horizontal multilayer barrier construction method in the embodiment has the beneficial effects that the ultrahigh-pressure rotary spraying injection system 10 is used for constructing the multilayer horizontal barrier layer 20 in the in-situ in the irregular landfill site, so that the barrier effect on pollutants in the in-situ repair process can be further improved, the repair effect can be consolidated, and the repair cost can be reduced.
Figure 2 is another schematic flow diagram of an in-situ horizontal multi-layer barrier construction method provided in accordance with an embodiment of the present disclosure. Figure 3 is a schematic view of a process plan layout structure of an in-situ horizontal multi-layer barrier construction method provided according to an embodiment of the present disclosure. As shown in fig. 2 and 3, the in-situ horizontal multi-layer barrier construction method comprises the following steps:
step S201, at least one target construction site is acquired.
For example, geological exploration and sampling analysis of pollution conditions at different depths are performed on a cadmium polluted site, so that the categories and concentrations of pollutants in different soil layers of the polluted site and the distribution condition of underground water are accurately known. And designing site distribution positions, drilling depths and concentrations of adsorption or reaction materials according to the types and concentrations of pollutants in different soil layers of a certain polluted site and the distribution condition of underground water.
In some embodiments, the specific implementation and technical effects of step S201 may refer to step S101 in those embodiments corresponding to fig. 1, and are not described herein again.
And S202, drilling and guiding holes based on the target construction point positions.
In some embodiments, a screw drill is used to drill holes at the target construction site.
Selecting a certain point distribution position A of a polluted site, wherein the drilling depth is 6 meters, moving a machine position of an ultrahigh pressure jet injection system 10 to the position, adjusting the jet radius parameter to be 1.2m, the vertical deviation to be less than 0.3 percent, and the injection pressure to be 35 MPa. And drilling and leading holes according to the specified design depth of 6 meters.
And S203, drilling at the target construction site by using the ultrahigh-pressure jet grouting injection system 10 based on the preset depth.
In some embodiments, the hole is drilled at a pre-drilled hole site by a auger or ultra-high pressure jet injection system 10.
Step S204, a multi-layer horizontal barrier layer 20 is generated based on the target barrier material, the target adsorbent material/target reactive material and the drilled hole.
In some embodiments, creating the multi-layer horizontal barrier layer 20 based on the target barrier material, the target adsorbent material/target reactive material, and the borehole includes injecting the target barrier material into the borehole at high pressure to form a first barrier layer 201 that meets a predetermined thickness threshold, wherein the target barrier material is a barrier material containing an impermeable slurry. In the present embodiment, the ultrahigh-pressure jet injection system 10 is adopted to mix the barrier material into a mixture of the barrier material and the barrier material in a mass ratio of 1: 1: 2, injecting the seepage-proofing slurry formed by the attapulgite, the sepiolite and the cement which are uniformly mixed into the drill hole at high pressure, and waiting for 10 minutes to form a first seepage-proofing barrier layer 201 with the thickness of 0.3 m. Injecting a target adsorbing material/target reaction material into the drilled hole by using the ultrahigh-pressure jet injection system 10 to form a first adsorption reaction layer 202 with a preset thickness threshold, wherein the first impermeable barrier layer 201 is positioned at the lower part of the first adsorption reaction layer 202. In some embodiments, the time interval between injecting the target sorbent material/target reactive material into the borehole to form the first layer of sorbent reactive layer 202 at the predetermined thickness threshold and injecting the target barrier material into the borehole at a high pressure to form the first barrier layer 201 meeting the predetermined thickness threshold is greater than or equal to 8 minutes. In this example, a slurry of the target adsorbent/target reactive material which is an adsorbent of a mercapto compound and a phosphate was injected into the drilled hole to form the first adsorption reaction layer 202 having a thickness of 0.3 m.
Further, in some embodiments, creating a multi-layer horizontal barrier layer 20 based on the target barrier material, the target adsorbent material/target reactive material, and the borehole further comprises injecting the target barrier material into the borehole at a high pressure to form a second barrier layer 201 that meets a predetermined thickness threshold, wherein the target barrier material is a barrier material comprising an impermeable slurry. In the present embodiment, the ultrahigh-pressure jet injection system 10 is adopted to mix the barrier material into a mixture of the barrier material and the barrier material in a mass ratio of 1: 1: 2 injecting the seepage-proofing slurry formed by the attapulgite, the sepiolite and the cement which are uniformly mixed into the drill hole at high pressure, and waiting for 10 minutes to form a second seepage-proofing barrier layer 201 with the thickness of 0.3 m. And injecting the target adsorption material/target reaction material into the drilled hole to form a second adsorption reaction layer 202 with a preset thickness threshold, wherein the second impermeable barrier layer 201 is positioned at the lower part of the first adsorption reaction layer 202.
In some embodiments, the time interval between injecting the target barrier material into the borehole at high pressure to form the second barrier layer 201 meeting the predetermined thickness threshold and injecting the target adsorbent/target reactive material into the borehole to form the second adsorbent reactive layer 202 meeting the predetermined thickness threshold is greater than or equal to 8 minutes. In this embodiment, the second layer adsorption reaction layer 202 having a thickness of 0.3m is formed by injecting a slurry of the target adsorbent/target reaction material, which is an adsorbent of a mercapto compound and a phosphate, into a borehole using the ultrahigh pressure jet grouting system 10. Further, a second barrier layer 201 is disposed on top of the first adsorptive reaction layer 202. In the embodiment, the pressure in the pipe of the ultrahigh-pressure rotary jet injection system 10 is 30-55MPa, the jet radius is not less than 1m, and the drilling verticality deviation is less than 0.5%.
The construction of the multilayer horizontal barrier layer 20 at the dispensing position a can be achieved by repeating the above steps S201-S204 a number of times. And after the distribution position A is finished, moving the machine position to a distribution position B of the polluted site, repeating the steps S201-S204, finishing the barrier construction of the polluted site, and effectively managing and controlling the risk of the polluted groundwater caused by the serious cadmium pollution of the polluted site. Compared with the common in-situ high-pressure jet grouting injection process, the construction method for the in-situ horizontal multilayer barrier in the embodiment has the advantages that the barrier efficiency is improved by more than 30%, the construction cost is lower than 500 yuan/m 3, and the economical efficiency is good.
In other embodiments, the first adsorptive-reactive layer 202, the second adsorptive-reactive layer 202, the first barrier layer 201, and the second barrier layer 201 have a thickness of 0.1m to 0.5 m. For example, 0.2m, 0.3m, 0.4m, etc. are not limited thereto.
The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present disclosure, and are intended to be included within the scope of the present disclosure.
Claims (9)
1. An in-situ horizontal multi-layer barrier construction method is characterized by comprising the following steps:
acquiring at least one target construction site;
and aiming at each target construction point in the at least one target construction site, constructing a multilayer horizontal barrier layer at the target construction point by utilizing an ultrahigh pressure jet grouting injection system, wherein the multilayer horizontal barrier layer comprises at least two anti-seepage barrier layers and at least two adsorption reaction layers.
2. The in-situ horizontal multi-layer barrier construction method according to claim 1, wherein constructing a multi-layer horizontal barrier layer at each target construction site in the at least one target construction site by using an ultrahigh pressure jet grouting injection system comprises:
drilling and guiding holes based on the target construction point positions;
based on a preset depth, drilling at the target construction point by using the ultrahigh-pressure jet grouting injection system;
generating the multi-layer horizontal barrier layer based on a target barrier material, a target adsorbent material/target reactive material, and the bore hole.
3. The in-situ horizontal multi-layer barrier construction method of claim 2, wherein the generating the multi-layer horizontal barrier layer based on a target barrier material, a target adsorbent material/target reactive material and the bore hole comprises:
injecting the target barrier material into the drilled hole at high pressure to form a first anti-seepage barrier layer meeting a preset thickness threshold, wherein the target barrier material is a barrier material containing anti-seepage slurry;
injecting the target adsorption material/the target reaction material into the drilled hole to form a first adsorption reaction layer with a preset thickness threshold, wherein the first anti-seepage barrier layer is positioned at the lower part of the first adsorption reaction layer;
injecting the target barrier material into the drilled hole at high pressure to form a second anti-seepage barrier layer meeting the preset thickness threshold;
and injecting the target adsorption material/the target reaction material into the drilled hole to form a second adsorption reaction layer with a preset thickness threshold, wherein the second anti-seepage barrier layer is positioned at the lower part of the second adsorption reaction layer.
4. The in-situ horizontal multi-layer barrier construction method according to claim 1, wherein the ultrahigh pressure rotary jetting injection system is constructed by a triple pipe method or an omnibearing high pressure jetting method.
5. The in-situ horizontal multilayer barrier construction method according to claim 1 or 4, wherein the pressure in the pipe of the ultrahigh pressure jet grouting injection system is 30-55 MPa.
6. The in-situ horizontal multi-layer barrier construction method according to claim 1, wherein the spray radius of the ultrahigh pressure jet grouting injection system is not less than 1m, and the drilling verticality deviation is less than 0.5%.
7. The in-situ horizontal multi-layer barrier construction method according to claim 3, wherein the materials of the first barrier layer and the second barrier layer comprise, in a mass ratio of 1: 1: 2 the attapulgite, the sepiolite and the cement are mixed, and the first layer of adsorption reaction layer and the second layer of adsorption reaction layer comprise adsorption materials of sulfhydryl compounds and phosphates.
8. The in-situ horizontal multi-layer barrier construction method according to claim 3, wherein a time interval between the injection of the target adsorption material/the target reaction material into the borehole to form a first adsorption reaction layer with a preset thickness threshold and the injection of the target barrier material into the borehole at high pressure to form a first barrier layer meeting the preset thickness threshold is greater than or equal to 8 minutes;
and injecting the target barrier material into the drilled hole at high pressure to form a second anti-seepage barrier layer meeting the preset thickness threshold, and injecting the target adsorbing material/the target reaction material into the drilled hole to form a second adsorption reaction layer with the preset thickness threshold, wherein the time interval between the second adsorption reaction layer and the target adsorbing material/the target reaction material is greater than or equal to 8 minutes.
9. The in-situ horizontal multi-layer barrier construction method according to claim 3 or 8, wherein the thickness of the first adsorption reaction layer, the second adsorption reaction layer, the first barrier layer and the second barrier layer is 0.1-0.5 m.
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| CN214497480U (en) * | 2020-11-27 | 2021-10-26 | 中国水利水电第四工程局有限公司 | Built landfill yard base seepage prevention structure |
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| CN213171564U (en) * | 2020-05-21 | 2021-05-11 | 天津中联格林科技发展有限公司 | Composite low-permeability vertical separation reaction wall |
| CN112411527A (en) * | 2020-10-19 | 2021-02-26 | 南京格洛特环境工程股份有限公司 | Blocking method for in-situ remediation of polluted land under complex working conditions |
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Application publication date: 20220729 |