CN112878276B - Barrier lake drainage groove net chain slope protection structure and method - Google Patents
Barrier lake drainage groove net chain slope protection structure and method Download PDFInfo
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- CN112878276B CN112878276B CN202110281863.0A CN202110281863A CN112878276B CN 112878276 B CN112878276 B CN 112878276B CN 202110281863 A CN202110281863 A CN 202110281863A CN 112878276 B CN112878276 B CN 112878276B
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- 230000004888 barrier function Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004873 anchoring Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 238000009954 braiding Methods 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 230000003111 delayed effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a barrier lake diversion trench net chain slope protection structure and a barrier lake diversion trench net chain slope protection method, wherein an initial diversion trench side slope (8), an initial diversion trench bottom slope (9), a post-collapse diversion trench side slope (10) and a barrier dam crest (11); after the damming body is broken, one end of the wedge-shaped net chain (6) is connected with the anchoring structure (3) through the chain (4), the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counterweight (7) through the chain (4), the steel bar gabion submerged counterweight (7) and the wedge-shaped net chain (6) are positioned in the diversion trench (2) after the damming body is broken, the defect that any damming lake in the prior art freely develops and can form overtopping breaking flood is overcome, and the defect that the breaking capacity is extremely high is overcome.
Description
Technical Field
The invention relates to the technical field of barrier lake risk disposal in the field of hydraulic engineering emergency rescue, in particular to a barrier lake drainage groove net chain slope protection structure and a barrier lake drainage groove net chain slope protection method.
Background
The barrier lake is taken as a major natural disaster, and is a natural lake formed by river collapse, landslide and even mud-rock flow under the condition of a certain topography and topography due to the dynamic geological action of a bank slope, and a corresponding deposit blocking a river channel is called a barrier body.
Aiming at the burst risk of high-risk barrier lakes, the currently adopted engineering measure is to excavate drainage grooves at the top bealock of the barrier body to reduce the water level and the water storage capacity of the reservoir, and particularly for the barrier lakes with dense population in downstream areas, the drainage grooves can quickly and effectively reduce disaster damage.
The key idea of the dam diversion trench is that when the upstream reservoir water level of the dam is low and the reservoir capacity is small, the dam is drained in advance, and the risk is reduced, the main action mechanism is that the drain trench bottom channel is undercut by utilizing the down-flow rapid flow and the side slope is transversely expanded to form a steep bank, and the up-flow development is continuously carried out to further trace the source to erode the drain trench bottom channel and the side slope, so that the dam is gradually collapsed, and a breaking flood peak is formed.
However, the current engineering measures only can realize the advanced overflow of the barrier lake, and when the downward leakage flow in the drainage groove is increased to a certain scale, the vertical undercut and the transverse expansion erosion rapidly develop, so that the burst flood is difficult to control, and the life and property safety of the downstream people is seriously threatened.
In order to prevent the collapse and instability of the damming body from being too fast, the current protective measures such as a giant reinforced gabion and a giant stone locking notch are mainly adopted, but in the specific practical application, the structures such as the giant reinforced gabion and the giant stone locking notch are arranged on the emergency disposal site of the traffic-blocked damming lake, the problems that the installation process is complicated, the transportation is inconvenient and the like generally exist, the drainage flow in a drainage groove is small in the initial stage of the breaking process, structures such as the gabion and the like touch the drainage flow prematurely, normal flushing and cutting are prevented, and the upstream storage capacity is extremely unfavorable to be reduced. In addition, along with the continuous development of the breaking process, the diversion trench of the barrier lake gradually collapses and deforms, the structural forms of the bottom trench and the side slope continuously and dynamically change, the structural forms of the diversion trench are basically difficult to dynamically adjust and adapt to the scouring deformation of the diversion trench by the traditional protective measures, thereby the side slope of the diversion trench is difficult to be continuously protected, the breaking of the diversion trench is delayed, and the effect of controlling the breaking peak is greatly weakened.
Disclosure of Invention
The first aim of the invention is to overcome the defects of the background art and provide a barrier lake drainage groove net chain slope protection structure.
The first object of the present invention is achieved by the following technical solutions: the dam body slope protection structure comprises a dam body initial drainage groove, a dam body after breaking, an anchoring structure, a chain, a dam body upstream slope, a wedge-shaped net chain, a reinforced gabion submerged counterweight, an initial drainage groove slope, an initial drainage groove bottom slope, a dam body after breaking and a dam top;
after the damming body is broken, one end of the wedge-shaped net chain is connected with the anchoring structure through the chain, the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counter weight through the chain, and the steel bar gabion submerged counter weight and the wedge-shaped net chain are positioned in the diversion trench after the damming body is broken.
In the technical scheme, the method comprises the following steps: when the damming body is not broken, the anchoring structure, the wedge-shaped net chain and the steel bar gabion submerged counterweight are connected through the chain and positioned on the upstream slope of the damming body, one end of the wedge-shaped net chain is connected with the anchoring structure through the chain, and the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counterweight through the chain.
In the technical scheme, the method comprises the following steps: the area from the upstream slope of the damming body to the fifth elevation of the dam crest of the damming body is a protection area, and a wedge-shaped net chain is arranged in the protection area.
The second object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide a method for protecting a slope of a chute net chain of a barrier lake.
The second object of the present invention is achieved by the following technical scheme: the method for protecting the slope protection structure of the drainage groove net chain of the barrier lake comprises the following steps of;
(1) digging and arranging a damming body initial drainage groove at the top of the damming body dam;
(2) braiding a wedge-shaped net chain, wherein the longitudinal scale of the wedge-shaped net chain is 3/4 times of the height of the damming body, the transverse scale is 1/3 of the width of the damming body, and the mesh size of the wedge-shaped net chain is 30 multiplied by 30cm;
(3) selecting a region below 1/5 dam height of the upstream slope of the damming body from the dam top of the damming body as a protection region, and respectively arranging an anchoring structure and a reinforced gabion submerged counterweight in the protection region;
(4) arranging a wedge-shaped net chain in a protection area in the step (3), connecting one end of the wedge-shaped net chain with the steel bar gabion submerged counter weight through a chain, keeping the wedge-shaped net chain longitudinally stretched along with the downward drainage flow, and connecting the other end of the wedge-shaped net chain with an anchoring structure through the chain to ensure that the wedge-shaped net chain is not washed away by the downward drainage flow;
(5) and when the water level of the upstream reservoir gradually rises into the bottom slope of the initial drainage groove, the downward leakage rapid flow gradually and vertically cuts and erodes the bottom slope of the initial drainage groove and transversely widens and erodes the side slope of the weir stopper drainage groove, the bottom slope of the initial drainage groove continuously and reversely develops and gradually extends until the upstream slope of the weir stopper due to the source tracing erosion effect, the weir stopper is broken, the drainage groove after the weir stopper is broken is formed, and finally the reinforcement gabion submerged counter weight slides into the drainage groove after the weir stopper is broken along with the chain due to the water flow traction and dragging effect.
Compared with the traditional giant steel bar gabion, giant stone locking notch and other protective structure measures, the invention has the following advantages:
1. the steel bar gabion submerged counterweight can utilize the drainage groove to excavate materials to obtain materials locally, the wedge-shaped net chain is simple and convenient to construct and convenient to install, and the drainage groove protection construction time can be greatly shortened especially on the construction site of a traffic-blocked barrier lake.
2. The wedge-shaped net chain has strong integrity and sufficient flexibility, can continuously adjust the structural form of the wedge-shaped net chain along with the collapse and deformation of the upstream slope of the damming body, and can slide into the diversion trench in good time, so that the normal flood discharge and overflow of the diversion trench are not affected, the bottom slope of the diversion trench can be continuously protected, the damming body is delayed to break, and the remarkable collapse control and peak clipping effects are achieved.
Drawings
FIG. 1 is a longitudinal schematic view of the present invention
Fig. 2 is a detailed view of the structure at a in fig. 1.
FIG. 3 is a schematic plan view of the present invention
In the figure: the dam body is characterized by comprising a dam body initial drainage groove 1, a dam body after breaking, a drainage groove 2, an anchoring structure 3, a chain 4, a dam body upstream slope 5, a wedge-shaped net chain 6, a reinforced gabion submerged counterweight 7, an initial drainage groove side slope 8, an initial drainage groove bottom slope 9, a drainage groove side slope 10 after breaking, a dam top 11, an i drainage groove longitudinal slope, a W dam body transverse width, an H dam body gap height and an L dam top longitudinal length.
Detailed Description
The following detailed description of the invention, taken in conjunction with the accompanying drawings, is not to be taken as limiting the invention, but merely as exemplifications, and makes it easier and more obvious to understand the advantages of the invention.
Referring to fig. 1-2: the barrier lake diversion trench net chain slope protection structure comprises a barrier initial diversion trench 1, a barrier diversion trench after breaking 2, an anchoring structure 3, a chain 4, a barrier upstream slope 5, a wedge-shaped net chain 6, a reinforced gabion submerged counterweight 7, an initial diversion trench side slope 8, an initial diversion trench bottom slope 9, a diversion trench side slope after breaking 10 and a barrier top 11;
after the damming body is broken, one end of the wedge-shaped net chain 6 is connected with the anchoring structure 3 through the chain 4, the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counter weight 7 through the chain 4, and the steel bar gabion submerged counter weight 7 and the wedge-shaped net chain 6 are positioned in the drainage groove 2 after the damming body is broken.
When the damming body is not broken, the anchoring structure 3, the wedge-shaped net chain 6 and the steel bar gabion submerged counterweight 7 are connected through the chain 4 in sequence and are positioned on the upstream slope 5 of the damming body, one end of the wedge-shaped net chain 6 is connected with the anchoring structure 3 through the chain 4, and the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counterweight 7 through the chain 4. The anchoring structure 3, the wedge-shaped net chain 6 and the steel bar gabion submerged counterweight 7 are connected sequentially through the chain 4 and are positioned on the upstream slope 5 of the damming body, and the structure is simple and convenient to install and wide in coverage area.
The area from the upstream slope 5 of the damming body to the fifth elevation of the dam crest 11 of the damming body is a protection area, and a wedge-shaped net chain 6 is arranged in the protection area. The wedge-shaped net chain 6 is arranged in the protection area, so that the coverage area is wide, but the later drainage of the drainage groove is only restrained, and the early drainage of the drainage groove is not interfered, so that the collapse speed of the damming body and the evolution process of the flattened flood are delayed.
The basic principle of the invention is as follows: along with the gradual rising of the water level in the barrier lake reservoir region to the bottom slope of the drainage groove, the downflow of the drainage groove slowly cuts down and washes the downstream section to form a steep bank, and continuously and gradually develops upwards and erodes the bottom slope of the drainage groove in a tracing way until the drainage groove reaches a crumple, and the wedge-shaped net chain 6 laid on the upstream slope gradually enters the drainage groove due to the dragging action of the downflow.
Because the wedge-shaped net chain 6 adopts a flexible structure, the shape of the wedge-shaped net chain can be quickly adjusted along with collapse deformation of the undercut bottom slope of the drainage groove water flow, good integrity and flexibility of the wedge-shaped net chain can be fully exerted, the initial drainage groove bottom slope 9 is always protected, the phenomenon that the drainage groove bottom slope 9 is rapidly emptied by the drainage rushing flow and the stones with the size larger than meshes are rapidly flushed away along with the drainage rushing flow under the wedge-shaped net chain is prevented, so that the dam body is delayed from being broken, the rising speed of a breaking flood peak is delayed, the breaking flow is reduced, the breaking flood change process is stabilized, and the effect of controlling the breaking peak is achieved.
The invention also comprises a using method: the method for protecting the slope protection structure of the drainage groove net chain of the barrier lake comprises the following steps of;
(1) digging and arranging a damming body initial drainage groove 1 at the dam crest 11 of the damming body;
(2) braiding a wedge-shaped net chain 6, wherein the longitudinal scale of the wedge-shaped net chain 6 is 3/4 times of the height of the damming body, the transverse scale is 1/3 of the width of the damming body, and the mesh size scale of the wedge-shaped net chain 6 is 30 multiplied by 30cm;
(3) selecting a region below 1/5 dam height of the upstream slope 5 of the damming body from the dam top 11 of the damming body as a protection region, and respectively arranging an anchoring structure 3 and a reinforced gabion submerged counterweight 7 in the protection region;
(4) arranging a wedge-shaped net chain 6 in a protection area in the step (3), connecting one end of the wedge-shaped net chain 6 with the steel bar gabion submerged counter weight 7 through a chain 4, keeping the wedge-shaped net chain 6 longitudinally stretched along with the downward drainage flow, and connecting the other end of the wedge-shaped net chain 6 with an anchoring structure 3 through the chain 4 to ensure that the wedge-shaped net chain 6 is not washed away by the downward drainage flow;
(5) gradually rising the water level of an upstream reservoir to the inside of an initial drainage groove bottom slope 9, gradually vertically cutting the initial drainage groove bottom slope 9 by a downward leakage rapid flow, transversely widening and widening a drainage groove slope 8 of a cavitation weir, continuously backtracking and developing the initial drainage groove bottom slope 9 to the upstream side by the backtracking corrosion effect, gradually extending until the upstream slope 5 of the weir stopper, causing the collapse of the weir stopper, forming a drainage groove 2 after the collapse of the weir stopper, and sliding the reinforcement cage submerged counterweight 7 into the drainage groove 2 after the collapse of the weir stopper along with a lock chain 4 by the traction and dragging effect of water flow; the drainage groove 2 is prevented from being rapidly eroded after the damming body is broken, and the collapse speed of the upstream dam slope of the damming body is gradually reduced.
The parts not described in detail above are all prior art.
Claims (3)
1. The protection method of the barrier lake drainage groove net chain slope protection structure is characterized by comprising the following steps of: the barrier lake diversion trench net chain slope protection structure comprises a barrier initial diversion trench (1), a barrier post-breaking diversion trench (2), an anchoring structure (3), a chain (4), a barrier upstream slope (5), a wedge-shaped net chain (6), a reinforced gabion submerged counterweight (7), an initial diversion trench slope (8), an initial diversion trench bottom slope (9), a post-breaking diversion trench slope (10) and a barrier top (11);
after the damming body is broken, one end of the wedge-shaped net chain (6) is connected with the anchoring structure (3) through the chain (4), the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counter weight (7) through the chain (4), and the steel bar gabion submerged counter weight (7) and the wedge-shaped net chain (6) are positioned in the diversion trench (2) after the damming body is broken;
the protection method comprises the following steps:
(1) digging and arranging a damming body initial drainage groove (1) at a damming body dam crest (11);
(2) braiding a wedge-shaped net chain (6), wherein the longitudinal scale of the wedge-shaped net chain (6) is 3/4 times of the height of the damming body, the transverse scale is 1/3 of the width of the damming body, and the mesh size scale of the wedge-shaped net chain (6) is 30 multiplied by 30cm;
(3) selecting an area, which is 1/5 of the height of the dam crest (11) of the damming body, from the upstream slope (5) of the damming body as a protection area, and arranging an anchoring structure (3) and a reinforced gabion submerged counterweight (7) in the protection area respectively;
(4) arranging a wedge-shaped net chain (6) in a protection area in the step (3), connecting one end of the wedge-shaped net chain (6) with the reinforced gabion submerged counter weight (7) through a chain (4), keeping the wedge-shaped net chain (6) longitudinally stretched along with the downward drainage flow, and connecting the other end of the wedge-shaped net chain (6) with an anchor structure (3) through the chain (4) to ensure that the wedge-shaped net chain (6) is not washed away by the downward drainage flow;
(5) and when the water level of the upstream reservoir gradually rises to the inside of the initial drainage groove bottom slope (9), the downward leakage rapid flow gradually and vertically cuts and erodes the initial drainage groove bottom slope (9) and transversely widens and erodes the weir corking body drainage groove slope (8), the initial drainage groove bottom slope (9) continuously and reversely develops and gradually extends until the weir corking body upstream slope (5) due to the source tracing erosion effect, the weir corking body is broken, the drainage groove (2) is formed after the weir corking body is broken, and finally the reinforced gabion submerged counterweight (7) slides into the drainage groove (2) after the weir corking body is broken along with the chain (4) due to the water flow traction and dragging effect.
2. The protection method of the barrier lake drainage groove net chain slope protection structure according to claim 1, wherein the protection method comprises the following steps: when the damming body is not burst, the anchoring structure (3), the wedge-shaped net chain (6) and the steel bar gabion submerged counterweight (7) are connected through the chain (4) in sequence and are located on the upstream slope (5) of the damming body, one end of the wedge-shaped net chain (6) is connected with the anchoring structure (3) through the chain (4), and the other end of the wedge-shaped net chain is connected with the steel bar gabion submerged counterweight (7) through the chain (4).
3. The protection method of the barrier lake drainage groove net chain slope protection structure according to claim 2, wherein the protection method comprises the following steps: the area from the upstream slope surface (5) of the damming body to the fifth elevation area of the dam crest (11) of the damming body is a protection area, and a wedge-shaped net chain (6) is arranged in the protection area.
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| CN202110281863.0A CN112878276B (en) | 2021-03-16 | 2021-03-16 | Barrier lake drainage groove net chain slope protection structure and method |
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| CN202110281863.0A CN112878276B (en) | 2021-03-16 | 2021-03-16 | Barrier lake drainage groove net chain slope protection structure and method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113322906B (en) * | 2021-06-04 | 2022-03-25 | 中国科学院、水利部成都山地灾害与环境研究所 | Dam burst danger-removing flood-control method for steel cable net stone cage structure |
| WO2024016399A1 (en) * | 2022-07-17 | 2024-01-25 | 中国科学院、水利部成都山地灾害与环境研究所 | Regulation and control system in barrier dam sluice channel engineering |
| CN114991094B (en) * | 2022-07-17 | 2023-05-23 | 中国科学院、水利部成都山地灾害与环境研究所 | Dam spillway engineering regulation and control system |
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