CN110777731A

CN110777731A - Composite geomembrane structure for emergency rescue of piping of earth and rockfill dam

Info

Publication number: CN110777731A
Application number: CN201910991883.XA
Authority: CN
Inventors: 吕浩博; 乔飞扬; 季孔阳; 曹园; 陈咏诗; 强晟; 王建
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-02-11

Abstract

The invention discloses a composite geomembrane structure for piping emergency of an earth and rockfill dam, which comprises a fine metal wire mesh, wherein a geomembrane is laid on the fine metal wire mesh, and a plurality of metal strips are arranged on the fine metal wire mesh at intervals. When piping occurs, the composite geomembrane is manually unfolded from the dam crest, the novel composite geomembrane overcomes the buoyancy of water by means of larger self weight to sink, and blocks the piping inlet by means of the suction force at the piping inlet, so that the piping channel is prevented from being continuously expanded, and sufficient time is gained for emergency rescue; the geomembrane has low manufacturing cost, good effect and convenient operation, the device using the geomembrane as the main material has good universality, and after application and popularization, the device can better solve the dam break problem of the earth-rock dam caused by piping and can also be used for temporary seepage prevention when the concrete panel of the panel rock-fill dam breaks.

Description

Composite geomembrane structure for emergency rescue of piping of earth and rockfill dam

Technical Field

The invention relates to the technical field of geomembranes, in particular to a composite geomembrane which is artificially laid on an upstream face when piping occurs in an earth-rock dam, blocks a piping inlet and prevents a piping channel from further expanding.

Background

For our country, the reservoir is an important component of the comprehensive flood control engineering system. Although dam engineering technology has been advancing over the past years since the construction of a dam in our country, dam break events in reservoirs still occur every year. Most reservoirs composed of earth and rockfill dams are located in remote hilly and mountainous areas and are near high, and water quantity of the reservoirs is suddenly discharged when the reservoirs break, so that downstream water level sudden rising and reservoir water level steep falling are caused. The dam break wave formed by the dam break can cause bank collapse and other loss in reservoir areas, and can cause disastrous effects in downstream areas of reservoirs.

According to statistics, most of dam break reservoirs are earth-rock dams, which account for 94.5% of dam break, if earth-rock mixed dams with similar structural performance are added, the proportion is higher than 95.8%, and a larger proportion of medium and small earth-rock dam break events are caused by piping. At present, most of piping of earth and rockfill dams are limited to artificial drainage plugging in China, and danger is brought to emergency personnel. Under the background, a simple and effective novel composite geomembrane for piping emergency of earth and rockfill dams is very necessary and has wide application prospect.

Disclosure of Invention

The invention aims to provide a composite geomembrane structure for piping emergency of an earth and rockfill dam.

In order to solve the technical problems, the invention is realized by the following technical scheme:

a composite geomembrane structure for piping emergency of earth and rockfill dams comprises a fine metal wire mesh, wherein a geomembrane is laid on the fine metal wire mesh, and a plurality of metal strips are arranged on the fine metal wire mesh at intervals.

As an embodiment, a plurality of metal strips are arranged on the upper bottom surface of the fine metal wire mesh at intervals, the plurality of metal strips are arranged at intervals along the length direction of the fine metal wire mesh, and the geomembrane is laid on the upper bottom surface of the fine metal wire mesh and the metal strips.

As another embodiment, the geomembrane is laid on both the upper and lower bottom surfaces of the fine wire mesh, the geomembrane and the fine wire mesh form a composite structure, and a plurality of metal strips are arranged at intervals on one bottom surface of the composite structure, and are arranged at intervals along the length direction of the composite structure a.

In this application, the geomembrane adopts a cloth membrane type specification.

Preferably, both ends of the geomembrane are fixed at both ends of the fine wire mesh in the length direction through the metal strips.

Compared with the prior art, the invention has the beneficial effects that:

when piping occurs, the composite geomembrane is manually unfolded from the dam crest, the novel composite geomembrane overcomes the buoyancy of water by means of larger self weight to sink, and blocks the piping inlet by means of the suction force at the piping inlet, so that the piping channel is prevented from being continuously expanded, and sufficient time is gained for emergency rescue;

the geomembrane has low manufacturing cost, good effect and convenient operation, the device using the geomembrane as the main material has good universality, and after application and popularization, the device can better solve the dam break problem of the earth-rock dam caused by piping and can also be used for temporary seepage prevention when the concrete panel of the panel rock-fill dam breaks.

Drawings

Fig. 1 is a construction schematic diagram of the invention used for the piping emergency of the earth and rockfill dam.

Fig. 2 is a schematic structural diagram of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings:

fig. 1 and 2 show that the composite geomembrane structure for piping emergency of earth and rockfill dams comprises a fine metal wire mesh 2, and a geomembrane 1 is laid on the fine metal wire mesh.

Example 1

A plurality of metal strips are arranged on the upper bottom surface of the fine metal wire mesh at intervals, the metal strips are arranged along the length direction of the fine metal wire mesh at intervals, and the geomembrane is laid on the upper bottom surface of the fine metal wire mesh and the metal strips.

Example 2

Geomembrane all is laid on the upper and lower bottom surface of fine wire mesh, and geomembrane and fine wire mesh form composite construction, and the interval is provided with a plurality of metal strips 3 on a bottom surface of this composite construction, and a plurality of metal strips set up along composite construction A's length direction interval, and the metal strip plays fixed geomembrane, increases the effect of whole structure weight.

The geomembrane in the above embodiments adopts a cloth-film type specification which is easy to roll up and unroll.

Both ends of the geomembrane in the above embodiments are fixed at both ends of the fine and dense wire mesh in the length direction through the metal strips, and can be glued.

The fine wire mesh in the above embodiments is fine enough to prevent gravel on the earth-rock dam from penetrating the geomembrane, and to protect the geomembrane.

When the inspection personnel of the earth and rockfill dam find piping dangerous cases, one end of the composite geomembrane structure with the metal strips is paved on the top end of the downstream surface to play a role in fixing the composite geomembrane. The composite geomembrane structure is rolled along the dam crest and the upstream surface, is spread along the piping position of the upstream surface, overcomes buoyancy under the action of the gravity of a fine metal wire mesh and a metal bar, is unfolded at the upstream surface, and covers the piping inlet. Under the action of suction and water pressure of the piping inlet, the composite geomembrane can play a role in plugging the piping inlet.

The non-illustrated parts referred to in the present invention are the same as or implemented by the prior art.

Claims

1. The composite geomembrane structure for the piping emergency of the earth and rockfill dam is characterized by comprising a fine metal wire mesh, wherein a geomembrane is laid on the fine metal wire mesh, and a plurality of metal strips are arranged on the fine metal wire mesh at intervals.

2. The composite geomembrane structure for piping emergency of earth and rockfill dams according to claim 1, wherein a plurality of metal strips are arranged on the upper bottom surface of the fine metal wire mesh at intervals, the metal strips are arranged along the length direction of the fine metal wire mesh at intervals, and the geomembrane is laid on the upper bottom surface of the fine metal wire mesh and the metal strips.

3. The composite geomembrane structure for piping emergency of earth and rockfill dams according to claim 1, wherein the geomembrane is laid on the upper and lower bottom surfaces of the fine wire mesh, the geomembrane and the fine wire mesh form a composite structure, and a plurality of metal strips are arranged on one bottom surface of the composite structure at intervals and are arranged along the length direction of the composite structure A at intervals.

4. The composite geomembrane structure for piping emergency of earth and rockfill dams according to claim 2 or 3, wherein the geomembrane is in a cloth-film type specification.

5. The composite geomembrane structure for piping emergency of earth and rockfill dams according to claim 2 or 3, wherein both ends of the geomembrane are fixed at both ends of the fine wire mesh in the length direction through metal strips.