Impermeable membrane anchoring structure for red mud storage yard

Abstract

The invention discloses a red mud storage yard impermeable membrane anchoring structure which comprises an end anchoring structure and a middle anchoring structure, for the end anchoring structure and the middle anchoring structure, a GCL (geosynthetic clay liner), an HDPE (high-density polyethylene) impermeable membrane and short fiber geotechnical cloth are sequentially laid on an anchoring platform with the cleaned surface and the leveled anchoring platform, and the GCL, the HDPE impermeable membrane and the short fiber geotechnical cloth are sequentially laid on the anchoring platform with the cleaned surface and the leveled anchoring platform. And a C20 concrete pressing film is laid on the upper portion of the steel pressing plate, and a drainage pipe is arranged in the concrete pressing film in a penetrating mode. According to the method, anti-seepage systems are arranged according to end anchoring platforms and middle anchoring platforms at different side slope positions of the red mud storage yard; when a rock stratum is arranged below the anchoring platform, the rock stratum below the impermeable film does not need to be excavated to form an anchoring groove in the anchoring construction process of the impermeable film, and then backfilling is conducted. On the premise of ensuring normal use of the impermeable membrane, the anchoring construction process of the impermeable membrane is simple and convenient, the construction efficiency is improved, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of the construction of the anti-seepage membrane of the red mud yard, in particular to an anti-seepage membrane anchoring structure of the red mud yard, more particularly to an anchoring device for the rock layer under the anti-seepage membrane. BACKGROUND

[0002] Red mud is an industrial solid waste discharged after the extraction of alumina from bauxite, which contains Al2O3, Na2O, SiO2, CaO, Fe2O3, TiO2, etc. When red mud comes into contact with water, red mud leachate is generated, and if the leachate flows into water areas, it will pollute surface water bodies and groundwater sources and change the ecological system function of the water body. An anti-seepage layer is arranged at the bottom and around the shore slope of the red mud yard, and the anti-seepage layer adopts a high-density polyethylene (HDPE) anti-seepage membrane, which meets the requirements of the Standard for Pollution Control on Storage and Landfill of General Industrial Solid Waste and can prevent the percolation of red mud leachate and avoid pollution of groundwater bodies.

[0003] At present, the anchoring method for the rock layer under the anti-seepage membrane of the red mud yard is as follows: a 0.6m (width) * 0.6m (depth) anchoring trench is excavated in the rock layer under the anti-seepage membrane, the anti-seepage membrane is then rolled into the anchoring trench, and finally backfilling is performed with backfilling soil, and the compaction coefficient is 0.95.

[0004] This method has two disadvantages: (1) The rock layer under the anti-seepage membrane is hard in texture, and the length of the anchoring trench in the red mud yard is relatively long. Therefore, the excavation of the anchoring trench will result in inconvenience in the construction process, reduced efficiency, and increased construction period during the infrastructure period.

[0005] (2) Since the rock layer is under the anti-seepage membrane, backfilling is required after the anchoring trench is excavated. Therefore, the excavated gravel needs to be transported out of the yard, the required backfilling soil needs to be transported to the surrounding area of the anchoring trench in the yard, and finally backfilling is performed, thereby increasing the construction period and transportation costs. SUMMARY

[0006] In view of the above-mentioned shortcomings and deficiencies, the present application provides an anti-seepage membrane anchoring structure for a red mud yard, which does not require excavation of the rock layer under the anti-seepage membrane to form an anchoring trench and backfilling during the anchoring construction process of the anti-seepage membrane. The purpose is to solve the problems of long construction period and low efficiency during the anchoring construction process of the anti-seepage membrane.

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the present application include: An anti-seepage membrane anchoring structure for a red mud stockyard is fixed on an anchoring platform of the red mud stockyard, the anchoring platform is cleaned and leveled, the anchoring structure comprises an end anchoring structure and a middle anchoring structure, for the end anchoring structure and the middle anchoring structure, GCL bentonite waterproof blanket, HDPE anti-seepage membrane and short fiber geotextile are sequentially laid on the anchoring platform after being cleaned and leveled, and are fixed by steel pressing plates and expansion bolts, C20 concrete pressing membrane is laid above the steel pressing plates, and a drainage pipe is arranged in the concrete pressing membrane.

[0008] The middle anchoring structure further comprises an anti-seepage membrane welding joint and a temporary pressing bag for connecting a plurality of anti-seepage membranes.

[0009] The thickness of the HDPE anti-seepage membrane is not less than 2 mm.

[0010] The longitudinal and transverse breaking strength of the short fiber geotextile is not less than 15 kN / m.

[0011] The structure size of the steel pressing plate is 100 mm*100 mm*5 mm.

[0012] The expansion bolt penetrates the steel pressing plate, the short fiber geotextile, the HDPE anti-seepage membrane, the GCL bentonite waterproof blanket and is pressed into the anchoring platform.

[0013] The drainage pipe is arranged in the lower part of the concrete pressing membrane, and one drainage pipe is arranged every 10 meters in the concrete pressing membrane.

[0014] The present application has the following beneficial effects and advantages: The anti-seepage membrane anchoring structure for the red mud stockyard sets the anti-seepage system according to the end anchoring platform and the middle anchoring platform at different positions of the red mud stockyard, when the anchoring platform is under the rock layer, the rock layer under the anti-seepage membrane does not need to be excavated to form an anchoring trench during the anti-seepage membrane anchoring construction, and then backfilling is performed, under the premise of ensuring the normal use of the anti-seepage membrane, the anti-seepage membrane anchoring construction process is simple, the construction efficiency is improved, and the construction period is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of an end anchoring structure of a stockyard slope; Figure 2 It is a structure schematic view of a middle anchoring structure of a stockyard slope.

[0016] Among them, 1 is an anchoring platform, 2 is a GCL bentonite waterproof blanket, 3 is an HDPE anti-seepage membrane, 4 is a short fiber geotextile, 5 is a steel pressing plate, 6 is a concrete pressing membrane, 7 is an expansion bolt, 8 is a drainage pipe, 9 is an anti-seepage membrane welding joint, and 10 is a temporary pressing bag. DETAILED DESCRIPTION

[0017] The application is further described below with reference to the accompanying drawings. The application is a kind of anchoring structure of bauxite residue stockpile anti-seepage membrane. First, the anchoring platform 1 in the bauxite residue stockpile plant area is cleaned and leveled.

[0018] As shown in the drawings, Figure 1 when the anchoring platform at the end of the bauxite residue stockpile slope needs to be constructed with an anti-seepage system, GCL bentonite waterproof blanket 2, 2.0 mm thick high-density polyethylene HDPE anti-seepage membrane 3, short fiber geotextile 4 with longitudinal and transverse breaking strength of 15 kN / m, and steel pressing plate 5 with specifications of 100 mm X 100 mm X 5 mm are sequentially laid according to the leveling condition of the anchoring platform 1. Then, expansion bolts 7 are arranged on the steel pressing plate 5 at an interval of 0.5 meters, the expansion bolts 7 are pressed into the anchoring platform 1, and finally C20 concrete pressing membrane 6 with a width of 800 mm and a height of 200 mm is arranged along the entire length of the HDPE anti-seepage membrane 3. An HDPE drainage pipe 8 with a length of 1000 mm and DN80 is reserved every 10 m in the lower part of the concrete pressing membrane 6.

[0019] As shown in the drawings, Figure 2 when the anchoring platform at the middle of the bauxite residue stockpile slope needs to be constructed with an anti-seepage system, multiple HDPE anti-seepage membranes need to be continuously or intermittently laid, and the multiple HDPE anti-seepage membranes 3 need to be effectively and reliably connected. GCL bentonite waterproof blanket 2, 2.0 mm thick high-density polyethylene HDPE anti-seepage membrane 3, short fiber geotextile 4 with longitudinal and transverse breaking strength of 15 kN / m, and steel pressing plate 5 with specifications of 100 mm X 100 mm X 5 mm are sequentially laid according to the leveling condition of the anchoring platform 1. Then, expansion bolts 7 are arranged on the steel pressing plate 5 at an interval of 0.5 meters, the expansion bolts 7 are pressed into the anchoring platform 1, and finally C20 concrete pressing membrane 6 with a width of 800 mm and a height of 200 mm is arranged along the entire length of the HDPE anti-seepage membrane 3. An HDPE drainage pipe 8 with a length of 1000 mm and DN80 is reserved every 10 m in the lower part of the concrete pressing membrane 6.

[0020] To ensure effective and reliable connection of the HDPE anti-seepage membrane 3, an anti-seepage membrane welding joint 9 is reserved on the anchoring platform 1, and a joint of 500 mm is reserved when laying the GCL bentonite waterproof blanket 2, the HDPE anti-seepage membrane 3, and the short fiber geotextile 4, which facilitates connection of multiple HDPE anti-seepage membranes 3. When the interval between different upper and lower membrane constructions is long, a temporary pressing bag 10 is used to temporarily press the HDPE anti-seepage membrane 3 to protect the membrane.

[0021] The application sets up an anti-seepage system according to the end anchoring platform and the middle anchoring platform at different slope positions of the bauxite residue stockpile. When the anchoring platform is under a rock layer, excavation of the rock layer under the anti-seepage membrane to form an anchoring trench is not required during the anti-seepage membrane anchoring construction process, and backfilling is not required. Under the premise of ensuring normal use of the anti-seepage membrane, the anti-seepage membrane anchoring construction process is simple, the construction efficiency is improved, and the construction period is shortened.

Claims

1. A geomembrane anchoring structure for a red mud stockpile, fixed on an anchoring platform within the red mud stockpile, wherein the surface of the anchoring platform is cleaned and leveled, characterized in that: The anchoring structure includes end anchoring structure and middle anchoring structure. For end anchoring structure and middle anchoring structure, GCL bentonite waterproof blanket, HDPE geomembrane and short fiber geotextile are laid in sequence on the cleaned and leveled anchoring platform, and fixed by steel pressure plate and expansion bolts. C20 concrete membrane is laid on top of steel pressure plate, and drainage pipe is installed inside the concrete membrane.

2. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The central anchoring structure also includes geomembrane welding joints and temporary pressure bags for connecting multiple geomembranes.

3. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The thickness of the HDPE geomembrane is not less than 2 mm.

4. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The longitudinal and transverse tensile strength of the short-fiber geotextile is not less than 15 kN / m.

5. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The structural dimensions of the steel pressure plate are 100mm*100mm*5mm.

6. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The expansion bolts penetrate the steel pressure plate, short fiber geotextile, HDPE geomembrane, and GCL bentonite waterproof blanket and are pressed into the anchoring platform.

7. The red mud stockpile geomembrane anchoring structure for shaft holes according to claim 1, characterized in that: The drainage pipe is installed in the lower part of the concrete membrane, with one drainage pipe installed every 10 meters of the concrete membrane.

Images