CN111101538A - Construction method of vertical engineering barrier system for neutralizing acid mine wastewater - Google Patents
Construction method of vertical engineering barrier system for neutralizing acid mine wastewater Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0266—Retaining or protecting walls characterised by constructional features made up of preformed elements
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- 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
- C04B28/001—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 containing unburned clay
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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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
- E02D31/06—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 against corrosion by soil or water
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
The invention provides a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater, which comprises the following steps: constructing and site selecting engineering barriers, and excavating engineering barrier ditches; manufacturing a reinforcement cage, and laying geotextile on the inner side of the reinforcement cage in the seepage direction; manufacturing a mixed block, and filling the mixed block into a reinforcement cage to form an engineering barrier wall unit; combining and assembling the wall units of the engineering barrier, and hoisting the wall units into the engineering barrier ditch; and collecting data around the engineering barrier and monitoring the heavy metal retardation effect. Compared with the prior art, the mixed block raw material is prepared from clay, fly ash and chemical additives, and has the advantages of low cost and good treatment effect; the engineering barrier wall units are assembled, so that the adaptability to site conditions and engineering requirements is strong; the construction steps are simple and easy to implement, and the hoisting and the lifting replacement are convenient; the engineering barrier wall units can be produced and sold in a large scale, the economic benefit is high, and the construction period of the engineering barrier is greatly shortened.
Description
Technical Field
The invention relates to the technical field of isolation control of environmental engineering geology and heavy metal polluted sites, in particular to a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater.
Background
Mineral resources have long been developed by people as an important resource which is beneficial to promoting economic development. However, due to the immaturity of mining technology and the inexhaustibility of sustainable development concepts, various mine problems are caused by long-term unreasonable development of mines, and most representative problems are acid mine wastewater. At present, the research on the acidic mine wastewater mainly comprises the aspects of property, harmless treatment, resource utilization and the like. The acid mine wastewater is wide in generation source, and seriously threatens the ecological environment around a mine by virtue of the low pH value and high concentration of heavy metal ions. Therefore, effective treatment of acid mine wastewater has long been a hot problem for researchers related to engineering geology and environmental engineering. The treatment technology aiming at the acid mine wastewater mainly comprises pollution source control and pollutant migration retardation. Practical experience proves that the aim of preventing the generation of the acid mine wastewater from the source is difficult to realize, and the pollutant migration retardation gradually becomes the main treatment mode of the acid mine wastewater.
Engineering barriers have been increasingly used in the treatment of acid mine wastewater in recent years due to their good resistance to heavy metals. The engineering barrier can effectively prevent pollutants such as heavy metals of the acid mine wastewater from entering the peripheral rock-soil body, and provides an isolation barrier for a polluted site and the peripheral environment. Currently, there are many challenges to the application of engineering barriers in acid mine wastewater treatment. The main material of the traditional engineering barrier is cement, only plays a role in preventing seepage and stopping water, hardly conducts diversion and purification treatment on acid mine wastewater, and the acid mine wastewater has a corrosion effect on the cement, so that the wall is easy to damage in the past for a long time. The clay vertical engineering barrier can effectively solve the problems, but the construction process is complex, the wall body is generally built in an integral body, the uniformity of the dirt separation performance is poor, the height and the width of the wall body are difficult to effectively control according to the actual field, the migration of heavy metals in pollutants is generally only considered to be controlled, the effect of neutralizing acid mine wastewater cannot be achieved, and the retarding capacity of the heavy metals is also to be improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater, and aims to simplify the construction process and improve the retardation capability and treatment effect of heavy metals.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater comprises the following steps:
(1) carrying out engineering barrier construction site selection on an acid mine wastewater polluted site, and excavating engineering barrier ditches;
(2) manufacturing a reinforcement cage, and laying geotextile on the inner side of the reinforcement cage;
(3) manufacturing a mixed block, and filling the mixed block into the reinforcement cage to form an engineering barrier wall unit;
(4) combining and assembling the engineering barrier wall units, and hoisting the engineering barrier wall units into the engineering barrier ditches to form an engineering barrier wall;
(5) collecting data of pH value, temperature, humidity, soil pressure, pore water pressure and ion concentration at two sides of the engineering barrier wall body, and monitoring heavy metal retardation effect;
the manufacturing method of the mixed block comprises the following steps:
a. uniformly mixing red clay, bentonite and fly ash according to the mass ratio of 30-90: 5-30: 0-60 to obtain a mixed soil body;
b. and (b) adding a chemical additive solution into the mixed soil body obtained in the step a, and performing compression molding to obtain a mixed block.
When the engineering barrier ditch is excavated in the step (1), the excavation depth and width are determined according to the engineering barrier burial depth and the wall thickness, the engineering barrier burial depth is required to exceed the maximum pollution depth so as to prevent the occurrence of the bypass, and the wall thickness is determined according to the pollution degree of the acid mine wastewater and the design life.
Preferably, lifting rings and assembling and fixing devices are arranged on the reinforcement cage in the step (2); the geotextile is applied to the seepage direction of the acidic mine wastewater on the inner side of the reinforcement cage.
Lifting rings and assembling and fixing devices are arranged on reinforcement cages outside the engineering barrier wall units, so that the engineering barrier wall units can be lifted and replaced conveniently, and the assembling and fixing devices are used for assembling the wall units into an engineering barrier whole; the geotextile is arranged to prevent the wall from erosion of acid mine wastewater and water and soil loss.
Preferably, the engineering barrier wall units are in a step shape, and can be combined and assembled in a vertical stacking mode, a left-right stacking mode and a front-back stacking mode.
Preferably, the combined assembly of the engineering barrier wall units can form a band-shaped, arc-shaped and annular engineering barrier and an engineering barrier system in the form of a multiple retardation in-situ reaction band.
The size of the engineering barrier wall units can be set to be 3.0m wide, 1.5m high and 0.6m thick, the engineering barrier wall units are in a step shape, the top view is that the upper half part of a rectangle extends 0.3m rightward, the lower half part extends 0.3m leftward, so that the engineering barrier wall units can be assembled in different combination forms to meet site conditions and actual engineering requirements, during assembling and hoisting, the width, the height and the thickness of the engineering barrier wall body are controlled according to the combination form of unit bodies, for example, a 13.8m wide engineering barrier wall body can be formed by overlapping 5 wall units left and right, a 6m high engineering barrier wall body can be formed by overlapping 4 wall units up and down, and a 1.2m thick engineering barrier wall body can be formed by overlapping 2 wall units front and back.
When the building block is assembled, a weak area may appear at the interface, and a small unit block of mixed soil should be filled to enhance the neutralizing and retarding performance.
Preferably, the multiple retardation in-situ reaction zone is formed by combining more than one neutralization engineering barrier wall and retardation engineering barrier wall.
More preferably, the mixed block in the neutralization engineering barrier wall unit is prepared from red clay, bentonite and fly ash according to the mass ratio of 30-65: 5-20: 30-60.
More preferably, the mixed block in the retarding engineering barrier wall unit is prepared from red clay, bentonite and fly ash according to the mass ratio of 40-90: 5-30: 0-30.
Preferably, the method further comprises the step of judging whether the engineering barrier system fails or reaches the service life according to the data collected in the step (5), and if so, replacing the engineering barrier wall.
Preferably, in the manufacturing method of the mixed block, the chemical additive solution is formed by mixing a chemical additive and distilled water, and the mass ratio of the chemical additive to the distilled water is 1: 5-15.
Preferably, in the manufacturing method of the mixed block, the chemical additive consists of hydantoin epoxy resin and a curing activator; wherein the mass ratio of the curing excitant to the hydantoin epoxy resin is 1:10-20, and the curing excitant is 3,3' -diaminodipropylamine (C)6H17N3)。
Preferably, the hybrid block is a 150 × 150 × 150mm (length × width × height) cubic block.
According to the construction method of the vertical engineering barrier system for neutralizing the acid mine wastewater, which is provided by the invention, the acid mine wastewater is neutralized by utilizing the strong basicity of the fly ash, otherwise, the acid mine wastewater has a leaching effect on heavy metals in the fly ash, the waste is treated by waste, the cooperative treatment and resource utilization of the fly ash and the acid mine wastewater are realized, the clay material which is low in cost and has strong adsorption capacity on the heavy metals is adopted to retard the diffusion and migration of the heavy metals, the environment-friendly chemical additive is adopted to stabilize the heavy metals, and the efficiency of treating the acid mine wastewater is higher.
The scheme of the invention has the following beneficial effects:
(1) the method is characterized in that the strong alkaline fly ash is utilized to neutralize the acid mine wastewater, the heavy metal in the fly ash is leached out by the acid mine wastewater, and then the heavy metal carried by the fly ash and the heavy metal are jointly treated, so that the fly ash and the acid mine wastewater are interacted, and the cooperative treatment and resource utilization of the fly ash and the acid mine wastewater are realized.
(2) The clay material with strong adsorption capacity to heavy metals is adopted to retard the diffusion and migration of the heavy metals, and the environment-friendly chemical additive is adopted to stabilize the heavy metals, so that the treatment effect of the heavy metals in the acidic mine wastewater is excellent.
(3) The method has strong adaptability to site conditions and engineering requirements, and is mainly embodied in that: the mixing proportion of the clay, the fly ash and the chemical additive in the mixed block can be optimized according to different functions of the engineering barrier; the width, height and thickness of the engineering barrier wall body are controlled according to the combination form of the unit bodies, and the engineering barrier can be spliced into a belt shape, an arc shape, a ring shape, multiple retardation and other combination forms according to site conditions and actual engineering requirements.
(4) The engineering barrier wall body is filled by mixed blocks, has uniform property compared with integral press building and forming,
(5) the engineering barrier wall units are made into a ladder shape, and the engineering barrier wall body spliced by the engineering barrier wall units can prevent acid mine wastewater from directly seeping through the wall body from splicing gaps.
(6) The exterior of the engineering barrier wall unit is wrapped by a steel reinforcement cage with hoisting rings, so that the hoisting, hoisting and replacement are convenient, and the construction is convenient.
(7) And geotextile is laid on the inner side of the reinforcement cage in the seepage direction, so that the wall body is prevented from being eroded by acid mine wastewater to cause water and soil loss.
(8) The mixed block, the reinforcement cage and the engineering barrier wall unit can be produced and sold in a large scale, the economic benefit is high, and the construction period of the engineering barrier is short.
(9) The red clay material is widely distributed in the south of the Yangtze river in China, the material is convenient to obtain, and the price is low; commercial bentonite can be purchased, and the price is low; the industrial hydantoin epoxy resin is available, low in price and convenient for large-scale use; the dosage of the curing excitant is less, and the economic benefit of the process technology is high.
Drawings
FIG. 1 is a process flow diagram of a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater, which is provided by the invention;
FIG. 2 is an engineering barrier wall unit provided by the present invention;
FIG. 3 is a schematic view of a strip-shaped engineering barrier assembled from engineering barrier wall units according to the present invention;
FIG. 4 is an assembled annular engineering barrier of the present invention provided by engineering barrier wall units;
fig. 5 is a view of the multiple retardation engineering barrier system assembled by the engineering barrier wall units provided by the invention.
Reference numerals: 1. geotextile; 2. a reinforcement cage; 3. assembling and fixing devices; 4. lifting a lifting ring; 5. mixing the blocks; 6. acid mine wastewater; 7. retarding the engineering barrier wall; 8. a sensor; 9. monitoring points (solution collection areas); 10. neutralizing the engineering barrier wall; 11. a first retarding engineering barrier wall; 12. a second block engineering barrier wall; 13. a water-blocking boundary.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a construction method of a vertical engineering barrier system for neutralizing acid mine wastewater, which solves or improves the problems of lack of neutralization treatment on acid mine wastewater, poor heavy metal retardation effect, complex construction process and the like in the existing treatment of acid mine wastewater engineering barriers. The method has the advantages that the acid mine wastewater is neutralized by adopting the strongly alkaline fly ash, the clay material with strong adsorption capacity on heavy metals is adopted to retard the diffusion and migration of the heavy metals, the environment-friendly chemical additive is adopted to stabilize the heavy metals, and the engineering barrier wall is rapidly constructed in a unit body assembly mode, so that the aim of efficiently treating the acid mine wastewater is fulfilled.
Example 1
Referring to fig. 1, 2 and 3, the present embodiment provides a strip-shaped engineering barrier wall assembled by engineering barrier wall units, which includes the following steps:
(1) according to the location of the acid mine wastewater pollution source, the peripheral engineering geology, the hydrogeological conditions and the retardation direction, determining that the acid mine wastewater is retarded by adopting a strip-shaped engineering barrier wall, selecting a building address, excavating a ditch, wherein the excavation depth reaches an underground water-resisting layer and is 5m (selected according to field conditions), the excavation length reaches the boundaries of water-resisting layers at two sides, and the excavation width is 0.6 m;
(2) manufacturing an external reinforcement cage of the engineering barrier wall unit, and laying geotextile on the inner side of the reinforcement cage in the acid mine wastewater seepage direction, wherein the arrow direction in the figure 3 is the acid mine wastewater seepage direction;
(3) manufacturing a retardation engineering barrier wall unit:
uniformly mixing red clay, bentonite and fly ash according to a mass ratio of 80:20:0 to obtain a mixed soil body; adding chemical additive solution into the mixed soil body, wherein the chemical additive solution is formed by mixing chemical additives and distilled water, the mass ratio of the chemical additives to the distilled water is 1:10, and the chemical additives are 3,3' -diamino dipropylamine (C)6H17N3) The curing excitant is mixed with the hydantoin epoxy resin according to the mass ratio of 1: 20; then pressing into a square mixed block with the specification of 150 multiplied by 150mm (length multiplied by width multiplied by height); and filling the mixed blocks into the reinforcement cage to form a retardation engineering barrier wall unit.
(4) And (3) hoisting the retardation engineering barrier wall units into the engineering barrier ditches, combining and splicing to form the strip-shaped engineering barrier wall body shown in the figure 3, wherein the height of the wall body is 5 m. The direction of the arrow in FIG. 3 is the flow of acid mine wastewater.
(5) Installing an acidimeter, a temperature sensor, a humidity sensor, a soil pressure sensor and a pore pressure sensor on two sides of a wall body of the retardation engineering barrier and arranging a percolate collecting area; continuously monitoring the change of pH value of the acid mine wastewater on two sides of the wall body and the change of temperature, humidity, soil pressure and pore water pressure data on two sides, periodically collecting the liquid on two sides of the engineering barrier to perform an ion concentration test, and monitoring the heavy metal retardation effect; and when the engineering barrier reaches the service life or loses the retardation function, the engineering barrier is integrally lifted and replaced.
Example 2
Referring to fig. 1, 2 and 4, the present embodiment provides an annular engineering barrier wall assembled by engineering barrier wall units, which includes the following specific operation steps:
(1) according to the location, the peripheral engineering geology, the hydrogeological conditions and the retardation direction of the acid mine wastewater pollution source, determining that the acid mine wastewater is retarded by adopting an annular engineering barrier wall, selecting a building address, excavating a ditch, wherein the excavation depth reaches an underground water-resisting layer and is 6m (selected according to field conditions), the pollution source is completely surrounded by the excavated annular ditch, and the excavation width of the ditch is 0.6 m;
(2) manufacturing an external reinforcement cage of the engineering barrier wall unit, and laying geotextile on the inner side of the reinforcement cage in the seepage direction; FIG. 4 shows the direction of the arrows indicating the seepage direction of the acidic mine wastewater;
(3) manufacturing a retardation engineering barrier wall unit:
uniformly mixing red clay, bentonite and fly ash according to a mass ratio of 80:20:0 to obtain a mixed soil body; adding chemical additive solution into the mixed soil body, wherein the chemical additive solution is formed by mixing chemical additives and distilled water, the mass ratio of the chemical additives to the distilled water is 1:8, and the chemical additives are 3,3' -diamino dipropylamine (C)6H17N3) The curing excitant is mixed with the hydantoin epoxy resin according to the mass ratio of 1: 15; then pressing into a square mixed block with the specification of 150 multiplied by 150mm (length multiplied by width multiplied by height); and filling the mixed blocks into the reinforcement cage to form a retardation engineering barrier wall unit.
(4) And (3) hoisting the wall units of the retardation engineering barrier into the engineering barrier ditches, combining and splicing to form the annular engineering barrier wall shown in figure 4, wherein the height of the wall is 6 meters. And small blocks of mixed soil are filled in gaps generated at the interface during assembly to enhance the retardation performance.
(5) Installing an acidimeter, a temperature sensor, a humidity sensor, a soil pressure sensor and a pore pressure sensor on two sides of a wall body of the retardation engineering barrier and arranging a percolate collecting area; continuously monitoring the change of pH value of the acid mine wastewater on two sides of the wall body and the change of temperature, humidity, soil pressure and pore water pressure data on two sides, periodically collecting the liquid on two sides of the engineering barrier to perform an ion concentration test, and monitoring the heavy metal retardation effect; and when the engineering barrier reaches the service life or loses the retardation function, the engineering barrier is integrally lifted and replaced.
Example 3
Referring to fig. 1, 2 and 5, an embodiment of the present invention provides an engineering barrier system in the form of a multiple-retardation in-situ reaction zone assembled by a neutralization engineering barrier wall unit and a retardation engineering barrier wall unit, which includes the following specific operation steps:
(1) according to the location, the peripheral engineering geology, the hydrogeological conditions and the retardation direction of the acid mine wastewater pollution source, determining a multiple retardation engineering barrier system formed by triple engineering barriers to neutralize and retard the acid mine wastewater, selecting three engineering barrier building addresses, excavating a ditch, wherein the excavation depth reaches an underground water-resisting layer and is 6m (selected according to field conditions), the excavation length reaches the boundaries of water-resisting strata on two sides, and the excavation width is 0.6 m;
(2) manufacturing an external reinforcement cage of the engineering barrier wall unit, and laying geotextile on the inner side of the reinforcement cage in the seepage direction; FIG. 5 shows the direction of the arrows indicating the seepage direction of the acidic mine wastewater;
(3) manufacturing a neutralization engineering barrier wall unit and a retardation engineering barrier wall unit:
uniformly mixing red clay, bentonite and fly ash according to the mass ratio of 35:5:60 to obtain a mixed soil body; adding chemical additive solution into the mixed soil body, wherein the chemical additive solution is formed by mixing chemical additives and distilled waterThe mass ratio of the chemical additive to the distilled water is 1:5, and the chemical additive is 3,3' -diamino dipropylamine (C)6H17N3) The curing excitant is mixed with the hydantoin epoxy resin according to the mass ratio of 1: 10; then pressing into a square mixed block with the specification of 150 multiplied by 150mm (length multiplied by width multiplied by height); and filling the mixed blocks into the reinforcement cage to form a neutralization engineering barrier wall unit.
Uniformly mixing red clay, bentonite and fly ash according to a mass ratio of 80:20:0 to obtain a mixed soil body; adding the chemical additive solution into the mixed soil body; then pressing into a square mixed block with the specification of 150 multiplied by 150mm (length multiplied by width multiplied by height); and filling the mixed blocks into the reinforcement cage to form a retardation engineering barrier wall unit.
(4) Respectively hoisting the neutralization engineering barrier wall units and the retardation engineering barrier wall units into an engineering barrier ditch, combining and splicing to form a multistage engineering barrier system as shown in figure 5, wherein the upstream part close to the acidic mine wastewater is a neutralization engineering barrier wall, and then a first retardation engineering barrier wall and a second retardation engineering barrier wall are arranged, and the height of the walls is 6 m;
(5) installing an acidimeter, a temperature sensor, a humidity sensor, a soil pressure sensor and a pore pressure sensor on two sides of the three engineering barrier walls, and arranging a percolate collecting area; continuously monitoring the pH value change, temperature, humidity, soil pressure and pore water pressure data change conditions of the acid mine wastewater on two sides of the three engineering barrier walls, periodically collecting the liquids on two sides of the engineering barrier for ion concentration test, and monitoring the heavy metal retardation effect; and when the engineering barrier reaches the service life or loses the functions of neutralization and retardation, the engineering barrier is integrally lifted and replaced.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A construction method of a vertical engineering barrier system for neutralizing acid mine wastewater is characterized by comprising the following steps:
(1) carrying out engineering barrier construction site selection on an acid mine wastewater polluted site, and excavating engineering barrier ditches;
(2) manufacturing a reinforcement cage, and laying geotextile on the inner side of the reinforcement cage;
(3) manufacturing a mixed block, and filling the mixed block into the reinforcement cage to form an engineering barrier wall unit;
(4) combining and assembling the engineering barrier wall units, and hoisting the engineering barrier wall units into the engineering barrier ditches to form an engineering barrier wall;
(5) collecting data of pH value, temperature, humidity, soil pressure, pore water pressure and ion concentration at two sides of the engineering barrier wall body, and monitoring heavy metal retardation effect;
the manufacturing method of the mixed block comprises the following steps:
a. uniformly mixing red clay, bentonite and fly ash according to the mass ratio of 30-90: 5-30: 0-60 to obtain a mixed soil body;
b. and (b) adding a chemical additive solution into the mixed soil body obtained in the step a, and performing compression molding to obtain a mixed block.
2. The construction method according to claim 1, wherein in the step (2), lifting rings and assembling and fixing devices are arranged on the reinforcement cage; the geotextile is applied to the seepage direction of the acidic mine wastewater on the inner side of the reinforcement cage.
3. The construction method according to claim 1, wherein the engineering barrier wall units are in a step shape, and can be assembled in a vertical stacking mode, a left-right stacking mode and a front-back stacking mode.
4. The construction method according to claim 3, wherein the combined assembly of the engineering barrier wall units forms an engineering barrier system in the form of a strip, an arc, a ring and a multiple retardation in-situ reaction zone.
5. The construction method according to claim 4, wherein the multiple retardation in-situ reaction zone is formed by combining more than one neutralization engineering barrier wall and retardation engineering barrier wall.
6. The construction method according to claim 5, wherein the mixed block in the neutralization engineering barrier wall unit is prepared from red clay, bentonite and fly ash according to a mass ratio of 30-65: 5-20: 30-60.
7. The construction method according to claim 5, wherein the mixed block in the retarding engineering barrier wall unit is prepared from red clay, bentonite and fly ash according to a mass ratio of 40-90: 5-30: 0-30.
8. The construction method according to claim 1, further comprising judging whether the engineering barrier system has failed or has reached the service life according to the data collected in the step (5), and if so, replacing the engineering barrier wall.
9. The construction method according to claim 1, wherein in the manufacturing method of the mixed block, the chemical additive solution is formed by mixing a chemical additive and distilled water, and the mass ratio of the chemical additive to the distilled water is 1: 5-15.
10. The construction method according to claim 1, wherein in the manufacturing method of the mixed block, the chemical additive is composed of hydantoin epoxy resin and curing activator; wherein the mass ratio of the curing activator to the hydantoin epoxy resin is 1:10-20, and the curing activator is 3,3' -diaminodipropylamine (C)6H17N3)。
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Cited By (3)
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| CN112979088A (en) * | 2021-03-09 | 2021-06-18 | 南昌航空大学 | Reduction barrier for treating slag acidic wastewater and application thereof |
| CN113102458A (en) * | 2021-04-12 | 2021-07-13 | 中南大学 | Epoxy resin solidified tailing sand and method for stabilizing chemical substances in tailing sand |
| CN114160542A (en) * | 2021-11-08 | 2022-03-11 | 中煤科工集团西安研究院有限公司 | Method and structure for cooperatively disposing waste incineration fly ash underground mine |
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