Sludge geology geomembrane anti-seepage system and construction method thereof

Abstract

The invention provides a silt geology geomembrane anti-seepage system which comprises a light cushion layer arranged above silt, a GCL bentonite waterproof blanket and an HDPE anti-seepage geomembrane are arranged above the light cushion layer, and a pressing device used for pressing and fixing the HDPE anti-seepage geomembrane is arranged above the HDPE anti-seepage geomembrane. A geotechnical cloth protection layer and an air guide pumping and discharging device used for maintaining negative pressure below the HDPE anti-seepage geomembrane are arranged above the water level infiltration area above the HDPE anti-seepage geomembrane, and the GCL geosynthetic clay liner and the HDPE anti-seepage geomembrane are fixed through an anti-seepage system fixing device. Belongs to the technical field of geomembrane seepage prevention. According to the silt geology geomembrane anti-seepage system and the construction method thereof, the problem that a traditional anti-seepage system design is difficult to apply under the silt geology condition is effectively solved, it is not needed to spend a large amount of cost for basic treatment, and the problem that the reliability of the anti-seepage system is insufficient due to the fact that no drainage and exhaust layer exists under the membrane is solved.

Description

Technical Field

[0001] The invention relates to a silt geological geomembrane anti-seepage system and a construction method thereof, belonging to the technical field of geomembrane anti-seepage. Background Art

[0002] In recent years, more and more geomembranes have been used as the main material of anti-seepage systems. Due to the good tensile strength, high impact strength, anti-seepage, acid and alkali resistance, heat resistance, weather resistance, and wear resistance of geomembranes, geomembrane anti-seepage systems have been widely used in the construction industry in coastal areas, and are also widely used in river dams, reservoirs, water diversion tunnels, roads, railways, airports, underground, underwater and other projects.

[0003] Commonly used anti-seepage materials at the bottom of landfills include low-permeability natural clay layers, compacted clay, geomembranes and clay pads. The anti-seepage layer is often a combination of these anti-seepage materials, such as the composite liner currently used in foreign countries, which is made of geomembranes and a layer of low-permeability materials in close contact, that is, geomembranes + compacted clay or geomembranes + clay pads. In order to discharge the leachate in time and reduce the leachate head on the anti-seepage liner, a drainage layer must be arranged in the liner system.

[0004] Usually, in silt geological areas, there is silt 10-20m below the surface, which has strong water retention, high water content, weak foundation bearing capacity and large disturbance impact. If a conventional anti-seepage system design is adopted, the silt foundation under the membrane needs to be treated at a high cost to ensure the stability of the foundation under the membrane and prevent the geomembrane from cracking due to settlement, which will cause leakage of the anti-seepage system. At the same time, due to the silt geology, the drainage and exhaust layer under the membrane cannot be constructed, which has a great impact on the reliability of the anti-seepage system.

[0005] Therefore, there is an urgent need in the art for a silt geological geomembrane anti-seepage system and a construction method thereof. Summary of the invention

[0006] The purpose of the invention is to solve the problem that the prior art lacks a geomembrane anti-seepage system used in silt geology and a construction method thereof.

[0007] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a silt geological geomembrane anti-seepage system and a construction method thereof.

[0008] The first aspect of the present invention provides a silt geological geomembrane anti-seepage system, including a lightweight cushion layer arranged above the silt, a GCL bentonite waterproof blanket and a HDPE anti-seepage geomembrane are arranged above the lightweight cushion layer, a pressing device for pressing and fixing the HDPE anti-seepage geomembrane is arranged above the HDPE anti-seepage geomembrane, a geotextile protective layer and an air-guiding and exhausting device for maintaining negative pressure under the HDPE anti-seepage geomembrane are arranged above the water level infiltration area above the HDPE anti-seepage geomembrane, and the GCL bentonite waterproof blanket and the HDPE anti-seepage geomembrane are fixed by the fixing device of the anti-seepage system.

[0009] Preferably, the lightweight cushion layer is made of alkali slag air bubble concrete, and the amount of alkali slag used is greater than 350kg / m 3 The bulk density is 1.0-1.1g / cm3 higher than water, the strength is 1.0-1.5MPa, and the cushion thickness is 20mm.

[0010] Preferably, the GCL bentonite waterproof blanket is added with a modifier to meet the use requirements under silt geological conditions with alkalinity and high salt content, and the unit mass of GCL is not less than 5500g / m 2 .

[0011] Preferably, the HDPE anti-seepage geomembrane is a 2 mm thick double-smooth HDPE anti-seepage geomembrane.

[0012] Preferably, the air-guiding and exhaust device includes a quick exhaust joint fixed on the HDPE anti-seepage geomembrane, a waterproof cover cloth and a vacuum pump. The waterproof cover cloth covers the quick exhaust joint, and the edge of the waterproof cover cloth is movably connected to the HDPE anti-seepage geomembrane. The vacuum pump is placed in an appropriate position when needed and turned on to exhaust air.

[0013] Preferably, the movable connection method is a zipper or adhesive.

[0014] Preferably, the air guiding and exhausting devices are symmetrically arranged with a spacing of no more than 30 meters.

[0015] Preferably, the anti-seepage system fixing device is composed of an anchoring ditch and a geobag arranged on the top of the pool body and on the ground, and the GCL bentonite waterproof blanket, HDPE anti-seepage geomembrane and geotextile protective layer are fixed in the anchoring ditch by pressing and covering with geobags.

[0016] A second aspect of the present invention provides a construction method for the above-mentioned silt geological geomembrane anti-seepage system, comprising the following steps:

[0017] Step 1: pouring a lightweight cushion layer;

[0018] Step 2: Based on the structural characteristics, slope construction is carried out in larger areas;

[0019] Step 3: Lay the GCL bentonite waterproof blanket and HDPE anti-seepage geomembrane from bottom to top. The GCL bentonite waterproof blanket and HDPE anti-seepage geomembrane are kept in close contact and constructed in blocks. After the GCL bentonite waterproof blanket is laid, the HDPE anti-seepage geomembrane is laid on top in time to prevent hydration damage to the GCL.

[0020] Step 4: Lay the geotextile protective layer;

[0021] Step 5: Install the air extraction device and use a vacuum pump to evacuate the air for no less than 48 hours to maintain negative pressure under the membrane;

[0022] Step 6: Fix the anti-seepage system material using an anti-seepage system fixing device;

[0023] Step 7: Conduct air pressure test on the weld and inspect the integrity of the geomembrane.

[0024] Preferably, in the step 1, before pouring the lightweight cushion layer, the silt foundation should be preliminarily leveled and the upper surface height of the cushion layer should be kept consistent.

[0025] Preferably, in step 2, the slope material is foamed concrete, the slope ratio of the slope is not less than 1:2, and the wet density of the foamed concrete is 0.6-0.8 g / cm 3 .

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The silt geological geomembrane anti-seepage system and the construction method thereof of the present invention effectively solve the difficult problem of applying the traditional anti-seepage system design under silt geological conditions, do not need to spend a lot of money on basic treatment, and solve the problem of insufficient reliability of the anti-seepage system caused by the lack of drainage and ventilation layer under the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the silt geological geomembrane anti-seepage system of this application;

[0029] Figure 2 It is a flow chart of the construction method of the anti-seepage system of the present invention;

[0030] Figure numerals: 1. Lightweight cushion layer; 2. GCL bentonite waterproof blanket; 3. HDPE anti-seepage geomembrane; 4. Air conduction and drainage device; 5. Geotextile protective layer; 6. Anti-seepage system fixing device; 7. Pressing device. DETAILED DESCRIPTION

[0031] In order to make the present invention more clearly understood, a preferred embodiment is described in detail with reference to the accompanying drawings as follows:

[0032] like Figure 1-2As shown, the present invention provides a silt geological geomembrane anti-seepage system and a construction method.

[0033] Example

[0034] A silt geological geomembrane anti-seepage system comprises a lightweight cushion layer 1 arranged above the silt, a GCL bentonite waterproof blanket 2 and a HDPE anti-seepage geomembrane 3 are arranged above the lightweight cushion layer 1, a pressing device 7 for pressing and fixing the HDPE anti-seepage geomembrane 3 is arranged above the HDPE anti-seepage geomembrane 3, a geotextile protective layer 5 and an air-guiding and exhausting device 4 for maintaining negative pressure under the HDPE anti-seepage geomembrane are arranged above the water level infiltration area above the HDPE anti-seepage geomembrane 3, and the GCL bentonite waterproof blanket 2 and the HDPE anti-seepage geomembrane 3 are fixed by an anti-seepage system fixing device 6.

[0035] To use, follow these steps:

[0036] Step 1: Preliminary leveling of the silt foundation, keeping the upper surface height of the cushion layer consistent, and pouring a lightweight cushion layer 1;

[0037] Step 2: According to the structural characteristics, slope construction is carried out in larger areas. The slope construction material is foamed concrete, the slope ratio is not less than 1:2, and the wet density of foamed concrete is 0.6-0.8g / cm 3 ;

[0038] Step 3, laying the GCL bentonite waterproof blanket 2 and the HDPE anti-seepage geomembrane 3 from bottom to top, the GCL bentonite waterproof blanket 2 and the HDPE anti-seepage geomembrane 3 are kept in close contact, and the block construction is adopted. After the laying of the GCL bentonite waterproof blanket is completed, the HDPE anti-seepage geomembrane is laid on top in time to prevent the GCL from being damaged by hydration;

[0039] Step 4, laying a geotextile protective layer 5;

[0040] Step 5, install the air extraction device 4, and use a vacuum pump to evacuate and exhaust the air for no less than 48 hours to maintain negative pressure under the membrane;

[0041] Step 6, using the anti-seepage system fixing device 6 to fix the anti-seepage system material;

[0042] Step 7: Conduct air pressure test on the weld and inspect the integrity of the geomembrane.

[0043] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A silt geological geomembrane anti-seepage system, characterized in that: It includes a lightweight cushion layer arranged above the silt, a GCL bentonite waterproof blanket and a HDPE anti-seepage geomembrane are arranged above the lightweight cushion layer, a pressing device for pressing and fixing the HDPE anti-seepage geomembrane is arranged above the HDPE anti-seepage geomembrane, a geotextile protective layer and an air-guiding and exhausting device for maintaining negative pressure under the HDPE anti-seepage geomembrane are arranged above the water level infiltration area above the HDPE anti-seepage geomembrane, and the GCL bentonite waterproof blanket and the HDPE anti-seepage geomembrane are fixed by the anti-seepage system fixing device.

2. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The lightweight cushion layer is made of alkali slag bubble concrete, and the amount of alkali slag used is greater than 350kg / m 3 , bulk density is 1.0-1.1g / cm higher than water 3 , strength 1.0-1.5MPa, cushion thickness 20mm.

3. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The GCL bentonite waterproof blanket is added with a modifier, and the unit mass of GCL is not less than 5500g / m 2 4. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The HDPE anti-seepage geomembrane is a 2mm thick double-smooth HDPE anti-seepage geomembrane.

5. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The air-guiding and exhausting device includes a quick exhaust joint fixed on the HDPE anti-seepage geomembrane, a waterproof cover cloth and a vacuum pump. The waterproof cover cloth covers the quick exhaust joint, and the edge of the waterproof cover cloth is movably connected to the HDPE anti-seepage geomembrane. The vacuum pump is placed in an appropriate position when needed and turned on to exhaust air.

6. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The air guiding and exhausting devices are symmetrically arranged with a spacing of no more than 30 meters.

7. The silt geological geomembrane anti-seepage system according to claim 1, characterized in that: The anti-seepage system fixing device is composed of an anchoring ditch and a geobag arranged on the top of the pool body and on the ground. The GCL bentonite waterproof blanket, HDPE anti-seepage geomembrane and geotextile protective layer are fixed in the anchoring ditch by pressing and covering with geobags.

8. A construction method for a silt geological geomembrane anti-seepage system as claimed in claim 1, characterized in that: The following steps are involved: Step 1: pouring a lightweight cushion layer; Step 2: Based on the structural characteristics, slope construction is carried out in larger areas; Step 3: Lay the GCL bentonite waterproof blanket and HDPE anti-seepage geomembrane from bottom to top. The GCL bentonite waterproof blanket and HDPE anti-seepage geomembrane are kept in close contact and constructed in blocks. After the GCL bentonite waterproof blanket is laid, the HDPE anti-seepage geomembrane is laid on top in time to prevent hydration damage to the GCL. Step 4: Lay the geotextile protective layer; Step 5: Install the air extraction device and use a vacuum pump to evacuate the air for no less than 48 hours to maintain negative pressure under the membrane; Step 6: Fix the anti-seepage system material using an anti-seepage system fixing device; Step 7: Conduct air pressure test on the weld and inspect the integrity of the geomembrane.

9. The construction method of the silt geological geomembrane anti-seepage system according to claim 8, characterized in that: In the step 1, before pouring the lightweight cushion layer, the silt foundation should be initially leveled and the upper surface height of the cushion layer should be kept consistent.

10. The construction method of the silt geological geomembrane anti-seepage system according to claim 8, characterized in that: In step 2, the slope material is foamed concrete, the slope ratio is not less than 1:2, and the wet density of the foamed concrete is 0.6-0.8g / cm 3 .

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