CN101963572A - Laboratory testing rig for detecting treatment effect of cement soil barrier isolation method - Google Patents

Abstract

The invention belongs to the field of environmental civil engineering, and specifically refers to an indoor test device for the treatment effect of a cement-soil barrier isolation method, which is used for testing the effect of an isolation barrier in blocking ion migration in a laboratory. The device is a rectangular box-shaped box without a cover plate, and the rectangular box-shaped box is divided into three empty chambers by two parallel thin cement-soil walls. The empty warehouse in the middle is placed with artificially prepared polluted soil or solution, and the uncontaminated clean soil is placed on both sides. The parameters such as the diffusion coefficient of the cement-soil barrier can be obtained through the model test, and then the breakdown time of the pollutant through the barrier and the service life of the barrier can be evaluated according to the diffusion-dispersion equation, and then the cement-soil barrier isolation method and the isolation method of the contaminated site can be evaluated. Its effect of blocking ion migration, etc.

Description

Indoor test device for the treatment effect of cement-soil barrier isolation method

technical field

The invention belongs to the field of environmental civil engineering, and specifically refers to an indoor test device for the treatment effect of a cement-soil barrier isolation method, which is used to test the effect of an isolation barrier in blocking ion migration in a laboratory.

Background technique

At present, since most cities in my country have not implemented a garbage classification system, and the garbage components are mixed, landfill disposal has become the main method for most cities in my country to deal with waste at this stage. According to the "Technical Specifications for Sanitary Landfill of Municipal Solid Waste" (CJJ17-2004) promulgated by the Ministry of Construction of China in 2004, landfills with natural anti-seepage conditions must meet, "The permeability coefficient of the lining should not be greater than 10 ^-7 cm/s, the thickness of the field bottom and four-wall lining should not be less than 2m". Generally speaking, it is difficult to meet natural sites where the permeability coefficient of rock and soil layers can meet the above requirements, so artificial anti-seepage is usually required.

At present, the anti-seepage measures at the bottom of the landfill mainly include vertical isolation anti-seepage and horizontal anti-seepage. Common vertical isolation measures used to control the migration of pollutants include: curtain grouting, underground separation walls, deep mixing pile walls, steel sheet pile walls, high-pressure jet grouting slab walls, etc. Among them, such as in landfills, vertical curtain grouting anti-seepage and deep mixing piles have certain advantages in terms of technology and economy, and are often used as the first choice in landfill projects. The method is to cement the cement slurry and soil particles to form a permeability coefficient Smaller isolation curtains to isolate pollutants by blocking their solute migration paths. However, in the design, it is only regarded as an anti-seepage screen. In fact, pollutants may also migrate through diffusion. Although the determination of migration parameters can be determined most accurately from field tests, it will be time-consuming and will affect the environment. Cause pollution, so it is generally determined through laboratory model tests. Some existing models and methods are only for clay barriers, mainly to measure the migration parameters (such as diffusion coefficient) of pollutants in clay barriers in the laboratory.

Contents of the invention

The purpose of the present invention is to provide an indoor test device for the treatment effect of the cement-soil barrier isolation method according to the deficiencies of the above-mentioned prior art. The rectangular box-shaped box is divided into three empty chambers by two parallel cement-soil thin walls. , the empty warehouse in the middle is placed artificially prepared polluted soil or polluted solution, and the unpolluted pure soil is placed on both sides. The parameters such as the diffusion coefficient of the cement-soil barrier can be obtained through model tests, and then the breakdown time and service life of pollutants passing through the barrier can be evaluated according to the diffusion-dispersion equation, and then the cement-soil barrier isolation method and its blocking of the polluted site can be evaluated. The effect of ion migration, etc.

The purpose of the present invention is realized by the following technical solutions:

An indoor test device for the treatment effect of the cement-soil barrier isolation method. The device mainly includes a rectangular box-shaped box and two thin cement-soil walls. The rectangular box-shaped box is divided into two parallel thin cement-soil walls. Three empty positions.

There is no gap between the side plates, the bottom plate and the thin cement-soil wall of the above-mentioned rectangular box-shaped box;

The above-mentioned thin cement-soil walls are provided with stainless steel support nets on the sides of the warehouses on both sides;

Among the three empty compartments of the above-mentioned box body, water outlet holes are opened at the positions below the side panels of the empty bins on both sides, and faucets are installed at the water outlet holes;

Among the three empty compartments of the above box, the volume of the middle empty compartment is the sum of the volumes of the empty compartments on both sides;

The aspect ratio of the middle empty compartment of the above-mentioned box body is not less than 2.

A device for making the cement-soil thin wall in the above-mentioned indoor test device, the device has the same rectangular box-shaped box as above, and two PVC plates are placed in parallel at the installation position of each cement-soil thin wall in the box , the distance between the two PVC boards is not less than the thickness of the cement-soil thin wall.

Between the two PVC plates placed in parallel at the installation position of each of the above-mentioned cement-soil thin walls, a PVC porous plate is arranged; The inter-board spacing between the PVC boards is consistent with the thickness of the cement-soil thin wall.

In addition, at the fixed connection position between the inner surface of the rectangular box-shaped model box and the PVC board, ribs for fixing the PVC board are added.

The advantages of the present invention are that the device is simple, practical, economical, simple to make, can be assembled with only a few plastic plates, no cover plate is needed, only one bottom plate and several side plates are needed, and pollutants (such as ions) through the migration of two cement-soil walls with different cement contents or different thicknesses. The price is low, and the cost of a similar box is only a few hundred yuan. During the test, only the diffusion process exists without the interference of seepage, and the measured diffusion coefficient is a pure diffusion coefficient, which is relatively accurate.

Description of drawings

Fig. 1 is the structural representation of indoor test device in the embodiment;

Fig. 2 is the device structure schematic diagram when making cement-soil thin wall in the embodiment;

Fig. 3 is the schematic diagram of the device structure after the formwork is removed when making the cement-soil thin wall in the embodiment.

Detailed ways

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

What mark 1-7 in accompanying drawing 1-3 is: box-shaped casing 1, thin cement-soil wall 2, outlet hole 3, PVC board 4, PVC perforated board 5, rib 6, stainless steel support net 7.

Accompanying drawing 1 is the schematic diagram of the structure of the indoor test device in the embodiment. As shown in Figure 1, the indoor test device for the treatment effect of the cement-soil barrier isolation method in this embodiment is mainly constructed by a rectangular box-shaped box 1 without a cover plate with a length of 1.2 meters, a width of 0.3 meters, and a height of 0.3 meters. , the side plate and the bottom plate of the box-shaped box body 1 are all PVC boards, and the inside of the rectangular box-shaped box body 1 is divided into three empty compartments by two parallel 1cm-3cm thick cement-soil thin walls, which are respectively the middle empty compartment and the two sides. Side bins, where artificially prepared polluted soil or polluted solution can be placed in the middle, and unpolluted pure soil can be placed on both sides, with a simple structure. The designed aspect ratio of the middle empty bin is not less than 2. In this embodiment, the volume of the middle empty bin is the sum of the volumes of the empty bins on both sides. Among them, there is no gap between the side plate, the bottom plate and the thin cement-soil wall of the rectangular box-shaped box, and no leakage occurs.

As can be seen from Figure 1, among the three empty chambers of the box body, water outlet holes 3 are provided at the positions below the side plates of the empty chambers on both sides, and water taps can be installed at the water outlet holes to discharge pore water in the soil during convenient use. For fixing and protecting the thin cement-soil wall, stainless steel support net 7 or PVC perforated plate 5 can also be set on the side of the thin cement-soil wall.

In order to make the cement-soil thin wall in the above-mentioned indoor test device, the device provided in this embodiment is shown in Figure 2 and Figure 3 . Fig. 2 is a schematic diagram of the device structure when making the thin cement-soil wall in the embodiment, and Fig. 3 is a schematic diagram of the device structure after the formwork is removed when making the thin cement-soil wall in the embodiment. As can be seen from Fig. 2 and Fig. 3, the device for making the cement-soil thin wall 2 has the same rectangular box-shaped box body as shown in Fig. Two PVC boards 4, the distance between the two PVC boards is not less than the thickness of the cement-soil thin wall. In the present embodiment, as shown in Figure 2, between the two PVC boards that the installation position of every cement-soil thin wall 2 is placed in parallel, a PVC porous board 5 is arranged, the PVC porous board and the PVC board 2 on one side of the empty warehouse in the middle Fitting together, the spacing between the PVC porous board and another PVC board is consistent with the thickness of the cement-soil thin wall, and cement-soil slurry is added to form the cement-soil thin wall.

In addition, when making the cement-soil thin wall, the ribs 6 for fixing the PVC board are added on the inner side of the rectangular box-shaped model box corresponding to the position of the PVC board, so as to strengthen and fix the PVC board.

After the cement-soil thin wall has been maintained for a certain period of time and has a certain strength, the formwork is removed and the PVC board is removed, as shown in Figure 3. In order to prevent the deformation and cracking of the cement-soil wall after form removal, the two sides of the cement-soil wall are supported by PVC perforated plates and additional stainless steel mesh. After a period of maintenance and stabilization, the thin wall of cement and soil on the rectangular box-shaped model box is completed.

Claims (9)

1. An indoor test device of cement-soil barrier isolation method disposal effect, it is characterized in that this device mainly comprises a rectangular box-shaped box body and two cement-soil thin walls, in the described rectangular box-shaped box body is made of two parallel cement A thin wall of soil separates the three empty warehouses. 2. The indoor test device of the treatment effect of a kind of cement-soil barrier isolation method as claimed in claim 1, characterized in that there is no gap between the side plates, the bottom plate and the thin cement-soil wall of the rectangular box-shaped box. 3. The indoor test device of a kind of cement-soil barrier isolation method disposal effect as claimed in claim 1, it is characterized in that described cement-soil thin wall is positioned at the side of both sides storehouse and is provided with stainless steel support net. 4. the indoor test device of a kind of cement-soil barrier isolation method disposal effect as claimed in claim 1, it is characterized in that in the three empty bins of the box body, the position below the side plate of the empty bins on both sides is provided with a water outlet, the A water tap is installed at the water outlet. 5. The indoor test device for the treatment effect of a cement-soil barrier isolation method according to claim 1, wherein the aspect ratio of the middle empty chamber of the box body is not less than 2. 6. The indoor test device for the treatment effect of a cement-soil barrier isolation method as claimed in claim 1, characterized in that among the three empty chambers of the box body, the volume of the middle empty chamber is the sum of the volumes of the empty chambers on both sides. 7. A device for making the cement-soil thin wall according to claim 1, characterized in that the device has the same rectangular box-shaped casing described in claim 1, and the installation of each cement-soil thin wall in the casing Two PVC boards are placed in parallel, and the distance between the two PVC boards is not less than the thickness of the cement-soil thin wall. 8. A kind of device for making cement-soil thin wall as claimed in claim 7, it is characterized in that a PVC perforated plate is arranged between two PVC plates placed in parallel at the installation position of each piece of cement-soil thin wall. 9. A kind of device for making cement-soil thin wall as claimed in claim 8, it is characterized in that described PVC perforated plate and the PVC plate on one side of the middle empty warehouse fit together, between the PVC perforated plate and another piece of PVC plate The spacing between the boards is consistent with the thickness of the thin cement-soil wall. 10. A kind of device for making cement-soil thin wall as claimed in claim 7, it is characterized in that at the position where the inner side of the rectangular box-shaped model box is fixedly connected with the PVC board, a rib for fixing the PVC board is added.

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