Underground water drainage system for associated radioactive material landfill

Abstract

The utility model relates to an underground water drainage system for an associated radioactive material landfill, and belongs to the technical field of underground water drainage. The underground water drainage system comprises an underground water drainage pipeline surrounding the landfill for a circle, and the underground water drainage pipeline is provided with a vertical water collecting well and a vertical inspection well. A through pipe communicated with the underground water guide and drainage pipeline is arranged in the vertical water collecting well, and a water permeable hole is drilled in the top of the underground water guide and drainage pipeline. The vertical water collecting well can effectively collect associated radioactive material landfill area underground water, the associated radioactive material is discharged through the guide and discharge pipeline, and the current natural foundation layer at the bottom of the landfill area is not damaged while the underground water level is lowered. The half-life period of nuclides is generally ten thousand years, in the process, once a reservoir bottom anti-seepage system loses efficacy, the original undisturbed natural base layer can effectively prevent nuclides from rapidly permeating into the environment, and therefore the safety of the associated radioactive material landfill is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of groundwater reduction and drainage, and particularly relates to a groundwater reduction and drainage system for associated radioactive material landfill. BACKGROUND

[0002] The Technical Code for Radiation Environmental Protection of Associated Radioactive Material Storage and Solid Waste Landfill (Trial) (HJ1114-2020) requires that the bottom of the foundation layer of the associated radioactive material landfill should be 3m lower than the groundwater level. The existing groundwater reduction and drainage facilities of domestic waste, general industrial solid waste and hazardous waste landfills are mostly guide and drainage pipes arranged at the bottom of the landfill area. This method has good groundwater guide and drainage effect, but once the anti-seepage structure is damaged, the leachate and other pollutants will quickly spread to the surrounding environment with the groundwater. For the landfill of associated radioactive material, the same groundwater guide and drainage method will pose a risk of radioactive material diffusion. Therefore, a stable, safe and convenient groundwater reduction and drainage system is needed for the associated radioactive material landfill disposal facility. SUMMARY

[0003] Based on the above description, the utility model provides a groundwater reduction and drainage system for associated radioactive material landfill to solve the problems raised in the background art.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A groundwater reduction and drainage system for associated radioactive material landfill comprises a groundwater guide and drainage pipe surrounding the landfill site, a vertical water collection well and a manhole are arranged on the groundwater guide and drainage pipe, a through pipe communicating with the groundwater guide and drainage pipe is arranged in the vertical water collection well, and a cover plate is arranged on the top of the water collection well.

[0006] Based on the above technical solution, the utility model can be further improved as follows.

[0007] Further, the side of the through pipe is sequentially filled with a water stop filler layer, a clay layer and a gravel layer from top to bottom.

[0008] Further, a sealing cover plate is arranged on the through pipe, a protective cover plate is arranged on the wellhead of the vertical water collection well, and the protective cover plate is located above the sealing cover plate.

[0009] Further, geotextile is wound around the outside of the through pipe, and the lower end of the through pipe is an open pipe.

[0010] Further, the top end of the open pipe is located in the clay layer.

[0011] Further, the height of the water stop filler layer is 3.5m.

[0012] Further, the height of the clay layer is 1.5m.

[0013] Further, the height of the gravel layer is 10m.

[0014] Further, the groundwater drainage pipe is rectangular, and the inspection well is located at four vertices.

[0015] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:

[0016] By setting the groundwater drainage pipe around the landfill site and the vertical water collection well, the system can effectively collect the groundwater in the associated radioactive material landfill area. The communication mode between the water collection well and the drainage pipe ensures that the groundwater can be smoothly guided and discharged, thereby reducing the groundwater level and avoiding the influence of the groundwater on the stability of the landfill site.

[0017] The vertical water collection well can effectively collect the groundwater in the associated radioactive material landfill area and discharge it through the drainage pipe, thereby reducing the groundwater level without damaging the existing natural foundation layer of the landfill site. The half-life of the nuclide is generally measured in ten thousand years, and in this process, the undisturbed natural foundation layer can effectively prevent the nuclide from rapidly penetrating into the environment once the impermeable system of the landfill site fails, thereby improving the safety of the associated radioactive material landfill site. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A top view structural schematic diagram of the associated radioactive material landfill groundwater drainage system is provided.

[0019] Figure 2 A Figure 1 A sectional view of part A-A.

[0020] In the drawings, the component list represented by each reference numeral is as follows:

[0021] 1, landfill area; 2, groundwater drainage pipe; 3, water collection well; 4, inspection well; 5, protective cover plate; 6, sealing cover plate; 7, through pipe; 8, geotextile; 9, water permeable hole; 10, water stop filler layer; 11, clay layer; 12, gravel layer. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0024] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. The terms "below" and "above" can include vertical orientations of devices in addition to horizontal orientations. For example, if a device is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Accordingly, the exemplary term "below" can encompass both an orientation of above and below. The devices can also be oriented in other ways (e.g., rotated 90 degrees or at other orientations), and the spatial descriptions used herein are exemplary and do not limit the orientations in which the device can be used or placed.

[0025] It is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device described is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. The terms "below" and "above" can include vertical orientations of devices in addition to horizontal orientations. For example, if a device is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Accordingly, the exemplary term "below" can encompass both an orientation of above and below. The devices can also be oriented in other ways (e.g., rotated 90 degrees or at other orientations), and the spatial descriptions used herein are exemplary and do not limit the orientations in which the device can be used or placed.

[0026] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the terms "comprise / comprising", "have / having" or "include / including" or any variation thereof, are intended to specify the presence of stated features, integers, steps, operations, elements, components or groups of features, integers, steps, operations, elements, components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components or groups thereof.

[0027] As Figure 1 , Figure 2 shown in FIG. 1, the system comprises a groundwater drainage pipe 2 surrounding the landfill area 1, and vertical water collecting wells 3 and inspection wells 4 are arranged on the groundwater drainage pipe 2. The vertical water collecting wells 3 are provided with through pipes 7 connected to the groundwater drainage pipe 2, and the connection is achieved by drilling through holes 9 on the top of the groundwater drainage pipe 2.

[0028] The pipe 7 is preferably an HDPE pipe, and the outside is wrapped with hot-melt long-fiber polyester geotextile 8, wherein the inside of the water collecting well 3 is filled with gaps around the pipe 7, the bottom is filled with gravel, the second is filled with clay compaction, and the last is filled with water stop filler. A sealing cover plate 6 is covered on the top of the pipe 7, and a protective cover plate 5 is arranged on the top of the water collecting well 3.

[0029] The lower end of the pipe 7 is an open pipe, and the top end of the open pipe is located in the clay layer 11.

[0030] In a common embodiment, the underground water drainage pipe 2 is rectangular, and the inspection wells 4 are located at the four vertices.

[0031] Embodiment one

[0032] A rectangular underground water drainage pipe 2 is constructed around the landfill site 1, and the pipe is constructed by pipe jacking, the overall elevation of the pipe is lower than the bottom of the reservoir by more than 3 m, and the pipe diameter D is 1200. The vertical water collecting well 3 is a vertical shaft with a diameter of D600, and the bottom of the well is connected with the drainage pipe to collect underground water.

[0033] The water collecting well 3 is arranged along the drainage pipe path, and the interval distance is 20 m, and the arrangement density can be increased according to the underground water drainage effect. The water collecting well 3 is provided with, from the outside to the inside, pebbles with a particle size of 10-20 mm, hot-melt long-fiber polyester geotextile 8 with a weight of 150 g / m2, and a DN300 HPDE pipe, wherein the pipe below 4.5 m is an open pipe. The cavity between the HPDE pipe and the well hole is filled with 10 m high 10-20 mm gravel, and then 1.5 m thick clay is poured and compacted, and finally 3.5 m thick water stop filler is poured. A plastic cover plate is covered on the top of the HPDE pipe, and a protective cover plate 5 is arranged on the top of the well hole, and thus the construction of the vertical water collecting well 3 is completed. The water permeable hole 9 is drilled after the pipe is accurately positioned inside the pipe.

[0034] The underground water passes through the above three layers of materials and enters the inverted drainage pipe through the water collecting well 3. In order to meet the operation and maintenance of the whole system, the working well and the receiving well of the pipe jacking operation engineering can be changed into inspection wells 4 after the engineering is completed, the inspection well 4 has a diameter of 2.5 m, is assembled and formed by using a prefabricated concrete well wall, and the gap between the pipe jacking operation well and the construction well is filled with gravel and clay compaction.

[0035] The vertical water collecting well 3 can effectively collect the associated radioactive material in the landfill reservoir, and the water is discharged through the drainage pipe, so that the underground water level is lowered without damaging the present natural foundation layer of the bottom of the landfill area. The half-life of the nuclide is generally counted in ten thousand years, and in this process, once the impermeable system of the reservoir bottom fails, the undisturbed natural foundation layer can effectively prevent the nuclide from rapidly penetrating into the environment, thereby improving the safety of the associated radioactive material landfill site.

[0036] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A groundwater dewatering system for landfills containing associated radioactive materials, characterized in that, It includes a groundwater drainage pipeline surrounding the landfill site (1), and the groundwater drainage pipeline (2) is equipped with a vertical water collection well (3) and an inspection well (4). The vertical water collection well (3) is equipped with a through pipe (7) that connects to the groundwater drainage pipeline (2), and the top of the water collection well (3) is covered with a cover plate.

2. The groundwater dewatering system for landfills containing associated radioactive materials according to claim 1, characterized in that, The side of the pipe (7) is filled with a water-stopping filler layer (10), a clay layer (11), and a gravel layer (12) from top to bottom.

3. The groundwater dewatering system for landfills containing associated radioactive materials according to claim 1, characterized in that, The pipe (7) is covered with a sealing cover plate (6), and the wellhead of the vertical water collection well (3) is covered with a protective cover plate (5), which is located above the sealing cover plate (6).

4. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 2, characterized in that, The outside of the through pipe (7) is wrapped with geotextile (8), and the lower end of the through pipe (7) is an open pipe.

5. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 4, characterized in that, The top of the perforated pipe is located in the clay layer (11).

6. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 2, characterized in that, The height of the water-stopping filler layer (10) is 3.5m.

7. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 2, characterized in that, The height of the clay layer (11) is 1.5m.

8. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 2, characterized in that, The height of the gravel layer (12) is 10m.

9. A groundwater dewatering system for landfills containing associated radioactive materials according to claim 1, characterized in that, The underground water drainage pipe (2) is rectangular, and the inspection well (4) is located at the four vertices.

Images