CN212271021U

CN212271021U - Protection structure for laying geomembrane on steep slope of tailing pond area

Info

Publication number: CN212271021U
Application number: CN202020778778.6U
Authority: CN
Inventors: 丁东彦
Original assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Current assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2021-01-01
Anticipated expiration: 2030-05-12

Abstract

The utility model discloses a protection architecture of geomembrane is laid to tailing storehouse district abrupt slope belongs to the environmental engineering field, has solved the easy problem of ageing, guard time weak point of geotechnological cloth that current method exists. The utility model discloses laid bed course and geomembrane in proper order on the ground top layer, laid three-dimensional drainage and seepage net sheet on the geomembrane top layer, three-dimensional drainage and seepage net sheet surface and inside are equipped with a plurality of irregular holes, and it has the sand to fill in the hole of three-dimensional drainage and seepage net sheet. The utility model provides a three-dimensional drainage and seepage net sheet has the sand collection soil function, can guarantee to fix the grit well on the geomembrane on the abrupt slope and not the landing, effectively prevents sand slip or geomembrane deformation problem, has avoided the geomembrane to expose wind in the air and has blown the sun, prevents that the geomembrane from windy the curling up even by tearing when meetting adverse environmental conditions such as gale.

Description

Protection structure for laying geomembrane on steep slope of tailing pond area

Technical Field

The utility model belongs to the environmental engineering field, concretely relates to protection architecture of geomembrane is laid to tailing storehouse district abrupt slope.

Background

Geosynthetics, which are high polymer matrix materials, have been widely used in civil engineering, such as water conservancy, municipal works, buildings, traffic, subways, tunnels and the like, in recent years. The geomembrane is an impermeable geosynthetic material, has extremely strong impermeability and high physical and mechanical performance indexes such as tensile strength, tear resistance, bursting and the like, and is mainly used in impermeable engineering for safely treating materials such as tailings, various waste materials, waste liquid, garbage and the like. For a small-area paved geomembrane, the geomembrane can be covered by tailings in 1-2 years generally, and the aging problem of the geomembrane is not obvious. However, after the geomembrane is laid in a large area, the geomembrane is covered by the tailings after about 8 to 10 years, and the geomembrane is exposed in the air for a long time and is easily influenced by external force, oxygen, light, heat and other factors in the environment to generate degradation and other reactions, so that the geomembrane is aged, the performance such as strength and the like is lost or partially lost, and even damaged, the geomembrane loses the anti-seepage function. Therefore, it is necessary to develop a new structure for protecting geomembranes.

The existing geomembrane protection method adopts a method of spraying concrete on the surface of the geomembrane and arranging a machine-woven net between the primary sprayed concrete and the secondary sprayed concrete, and mainly considers the reduction effect of water level lifting on the performance of the composite geomembrane aiming at the composite geomembrane on the upstream surface; the geomembrane impervious layer protection structure for the artificial wetland mainly considers the damage of foundation settlement or bottom gas expansion to the geomembrane; and a protection method in the construction process of laying the geomembrane under the action of dynamic load is also provided. Because the area of the tailing pond area is large, part of the side slope is steep, the cost of concrete spraying is high, and the construction difficulty is large, the existing related documents are not suitable for being used in the seepage-proofing engineering of the tailing pond.

In the seepage-proofing engineering of a tailing pond, a measure of laying a layer of geotextile on a geomembrane to protect the geomembrane is adopted in the traditional mode, but the geotextile can age and lose the protection effect after being in the air for too long time, the protection time of the geotextile is generally not more than 1 year, or the geomembrane can be rolled up and even torn when the geomembrane encounters strong wind and severe weather.

The geomembrane impervious layer is required to be laid in a large area in tailing pond engineering, the discharge period of tailings produced in a concentrating mill is generally long, the geomembrane can be exposed in the air for a long time after being laid, and some previous geomembranes can be exposed in the air for 4-5 years even if the geomembrane is laid in stages, so that the geomembrane is far from enough to be protected by one layer of geotextile, the area of a tailing pond area is large, part of side slopes are steep, and other protective measures are easy to slip and cannot be fixed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a protection architecture of geomembrane is laid to tailing storehouse district abrupt slope to solve the easy problem of ageing, the guard time weak point of geotechnological cloth that current method exists.

The technical scheme of the utility model is that: a protective structure for paving a geomembrane on a steep slope in a tailing reservoir area is characterized in that a cushion layer and the geomembrane are sequentially paved on the surface layer of a foundation, a three-dimensional drainage and seepage mesh sheet is paved on the surface layer of the geomembrane, a plurality of irregular holes are arranged on the surface and inside of the three-dimensional drainage and seepage mesh sheet, and sandy soil is filled in the holes of the three-dimensional drainage and seepage mesh sheet.

As a further improvement of the utility model, the diameter of the irregular holes is 10mm-30 mm.

As a further improvement of the utility model, the open pore density of the irregular pores is 15 to 20 percent.

As a further improvement of the utility model, the thickness of the three-dimensional drainage and seepage net sheet is 100mm-200 mm. If the three-dimensional drainage and seepage net sheet is too thin, sand and soil are not stabilized; the thickness is preferably 100mm to 200mm from the viewpoint of stability and economy.

As a further improvement of the utility model, the particle size of the sandy soil is 0.5mm-10 mm. If the particle size of the sandy soil is too small, the sandy soil is easily blown away by wind; after the tailings are covered in the later period, under the pressure of the tailings, the particle size of the sandy soil is not too large in order to prevent the sandy soil from puncturing the geomembrane.

As a further improvement, the bed course adopts a bentonite blanket, the bentonite blanket has waterproofness and higher ductility, and the specification is selected to be 4000g/m through engineering geological investigation test result²-6000g/m². The underlayment prevents the geomembrane from being punctured by the stone.

As a further improvement of the utility model, the thickness of the geomembrane is 1.5mm-3.0 mm.

As a further improvement of the utility model, the side slope of the reservoir area is more than 1: 3.0.

The utility model has the advantages that:

1. the utility model discloses lay three-dimensional drainage and seepage net sheet on the geomembrane upper surface that has laid, and pack the sand in the mesh inside, three-dimensional drainage and seepage net sheet has the sand collection soil function, can guarantee to fix the grit well on the geomembrane on the steep slope and not skid off, effectively prevent sand slip or geomembrane deformation problem, avoided the geomembrane to expose in the air and blown the sun, prevent that the geomembrane from appearing ageing damage and losing the prevention of seepage function, prevent that the geomembrane from windingly rolling up even can be protected and torn when meetting adverse environmental conditions such as strong wind, through environmental test simulation analysis year limit for more than 15 years, can satisfy the operation requirement of tailing storehouse;

2. the three-dimensional drainage and seepage net sheet has the functions of drainage, drainage and seepage after being filled with sandy soil, can effectively resist the scouring action of rainwater, effectively reduces the infiltration line of a tailing dam through the drainage and seepage action, and improves the stability of a dam body; although the slope of the reservoir area is steep, the sand collecting function of the three-dimensional drainage and seepage mesh sheet prevents the sand from sliding, and prevents the geomembrane from tearing and damaging due to sliding deformation;

3. the three-dimensional drainage and seepage net sheet material and the sand filled in the three-dimensional drainage and seepage net sheet material provide good protection for the geomembrane, can play a role of buffering, prevent the damage of falling objects to the geomembrane, have convenient and safe construction, easily ensure the quality and ensure that the geomembrane is not punctured by external force and damaged;

4. the utility model discloses lay the bed course between geomembrane and ground, prevent that the grit on the ground from punctureing the geomembrane, through set up the duplicate protection structure in geomembrane top and below, can effectively prolong the guard time.

Drawings

Fig. 1 is a schematic plan view of a protective structure for laying geomembrane on a steep slope of a tailing pond area;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

fig. 3 is a schematic structural view of the middle three-dimensional drainage mesh sheet of the present invention.

In the figure: 1-foundation; 2-cushion layer; 3-geomembrane; 4-three-dimensional drainage mesh sheet material; 5-sandy soil; 6-tailings.

Detailed Description

As shown in fig. 1-3, a protective structure for laying a geomembrane on a steep slope of a tailing pond area is characterized in that a cushion layer 2 and a geomembrane 3 are sequentially laid on the surface layer of a foundation 1, a three-dimensional drainage and seepage mesh sheet 4 is laid on the surface layer of the geomembrane 3, a plurality of irregular holes are formed in the surface and the inner part of the three-dimensional drainage and seepage mesh sheet 4, and sandy soil 5 is filled in the holes of the three-dimensional drainage and seepage mesh sheet 4.

The aperture of the irregular holes is 10mm-30 mm. The open pore density of the irregular pores is 15-20%.

The three-dimensional drainage and seepage mesh sheet 4 is made of a novel material formed by melting and lapping the disordered yarns, is high in pressure resistance, is provided with irregular holes in three dimensions respectively, and can be obtained commercially. The thickness of the three-dimensional drainage mesh sheet 4 is 100mm-200 mm.

The sand 5 has a particle size of 0.5mm-10 mm.

The cushion layer 2 adopts a bentonite blanket with the specification of 4000g/m²-6000g/m²。

The geomembrane 3 is made of a geosynthetic material with tensile, tear-resistant and seepage-proof properties. The thickness of the geomembrane 3 is 1.5mm-3.0 mm.

The reservoir area side slope is larger than 1: 3.0.

The tailings 6 are ores with the lowest valuable mineral grade after being subjected to mineral separation and other comprehensive utilization treatments.

The construction method comprises the following steps:

A. removing humus and irregular sharp stones on the surface layer of the reservoir area, leveling the foundation 1, and then paving a cushion layer 2 on the surface layer of the foundation 1;

B. gradually laying an impermeable layer of the geomembrane 3 on the laid cushion layer 2 and anchoring;

C. and paving a three-dimensional drainage and seepage mesh sheet 4 on the paved geomembrane 3, and filling sand 5 into gaps of the three-dimensional drainage and seepage mesh sheet 4.

And after the tailings 6 are discharged to the corresponding elevation in the later period, covering the tailings 6 on the three-dimensional drainage and seepage mesh sheet 4.

The utility model relates to a brand-new technical scheme that geomembrane was laid to tailing storehouse district steep slope large tracts of land prevents that the protection geomembrane from taking place to age and losing prevention of seepage function, through the performance that the three-dimensional row of environment accelerated simulation degradation experiment simulation 15 years oozed net sheet 4, reachs the three-dimensional row of the 15 th year and oozes net sheet 4 and takes place serious degradation, and the intensity surplus is 5kpa-8kpa and maintains stably basically, can know through the experiment the utility model discloses the protection time can reach more than 15 years. Simultaneously the utility model discloses have drainage in rainy period and the drainage of tailing emission later stage and ooze the effect, can reduce the saturation line of tailing dam effectively, prevent that the geomembrane from because of the tearing that slip deformation arouses destroy.

Claims

1. The utility model provides a protection architecture of geomembrane is laid to abrupt slope in tailing storehouse district which characterized in that: bedding layer (2) and geomembrane (3) have been laid in proper order on ground (1) top layer, have laid three-dimensional drainage and seepage netting sheet (4) on geomembrane (3) top layer, three-dimensional drainage and seepage netting sheet (4) surface and inside are equipped with a plurality of holes, and it has sand (5) to fill in the hole of three-dimensional drainage and seepage netting sheet (4).

2. The protection structure for paving the geomembrane on the steep slope of the tailing pond area according to claim 1, is characterized in that: the aperture of the hole is 10mm-30 mm.

3. The protection structure for paving the geomembrane on the steep slope of the tailing pond area according to claim 2, is characterized in that: the open pore density of the pores is 15-20%.

4. The protection structure for the geomembrane laying on the steep slope of the tailing pond area according to any one of claims 1 to 3, characterized in that: the thickness of the three-dimensional drainage mesh sheet (4) is 100mm-200 mm.

5. The protection structure for paving the geomembrane on the steep slope of the tailing pond area according to claim 4, is characterized in that: the particle size of the sandy soil (5) is 0.5mm-10 mm.

6. The protection structure for paving geomembrane on the steep slope of the tailing pond area according to claim 5, characterized in thatThe method comprises the following steps: the cushion layer (2) adopts a bentonite blanket with the specification of 4000g/m²-6000g/m²。

7. The protection structure for paving the geomembrane on the steep slope of the tailing pond area according to claim 6, is characterized in that: the thickness of the geomembrane (3) is 1.5mm-3.0 mm.

8. The protection structure for paving the geomembrane on the steep slope of the tailing pond area according to claim 7, is characterized in that: the reservoir area side slope is larger than 1: 3.0.