CN111622188A - Discrimination method for energy dissipation by adopting natural water cushion - Google Patents
Discrimination method for energy dissipation by adopting natural water cushion Download PDFInfo
- Publication number
- CN111622188A CN111622188A CN202010464385.2A CN202010464385A CN111622188A CN 111622188 A CN111622188 A CN 111622188A CN 202010464385 A CN202010464385 A CN 202010464385A CN 111622188 A CN111622188 A CN 111622188A
- Authority
- CN
- China
- Prior art keywords
- energy dissipation
- natural water
- water cushion
- safety index
- engineering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The method for distinguishing the energy dissipation of the natural water cushion is characterized by comprising two steps, wherein the step one is energy dissipation safety index calculation; step two, adopting natural water cushion to eliminate energy; (1) if the energy dissipation safety index W of the project is more than or equal to 4.0, the energy dissipation by adopting the natural water cushion is feasible; (2) if the energy dissipation safety index W of the project is less than 4.0, the design difficulty of adopting the natural water cushion for energy dissipation is larger. The method breaks through the limitation that the scheme is only preliminarily simulated according to engineering analogy and practical experience in the conventional energy dissipation scheme comparison and selection research process, can help the engineering to quickly determine the research thought and the main research direction of the flood discharge and energy dissipation design scheme, greatly reduces the comparison and selection demonstration workload of the design scheme, accelerates the design progress, and reduces the design difficulty and the design cost.
Description
Technical Field
The invention relates to the field of flood discharge and energy dissipation design of high dam engineering, in particular to a natural water cushion energy dissipation judgment method.
Background
With the development of water conservancy and hydropower projects in China, more and more water conservancy and hydropower projects are built in high mountain canyon regions. In high dam projects constructed in high mountain canyon regions, flood discharge and energy dissipation designs generally have adverse conditions of high water head, large flow, large flood discharge power, narrow river valley, complex geological conditions and the like, and various factors of compact and feasible pivot arrangement, safe and reliable energy dissipation, convenient construction, investment saving and the like need to be comprehensively considered. The construction method is limited by the terrain and geological conditions, the arrangement pattern of the project hub of the high dam in the narrow river valley is generally compact, and the arrangement space and the selection of the flood discharge energy dissipation type of the flood discharge energy dissipation building are limited. The trajectory energy dissipation is a common energy dissipation type, is widely applied to the engineering of high dams in narrow river valleys, but many projects are limited by conditions, the difficulty of adopting a scheme of fully lining artificial water cushions in an energy dissipation area is high, and the engineering investment is high, so that the energy dissipation by utilizing the natural water cushions in the energy dissipation area becomes an economic and effective design scheme.
At present, the research on the energy dissipation of the natural water cushion adopted by the narrow river valley high dam engineering is very limited, and particularly, the feasibility of the energy dissipation of the natural water cushion adopted by the narrow river valley high dam engineering does not have a general judgment standard at present, the flood discharge energy dissipation scheme has great uncertainty, and the energy dissipation safety is difficult to evaluate. In the comparison and selection research process of the energy dissipation scheme, most of the existing projects preliminarily draw up the comparison and selection scheme according to the project experience or the project class ratio, and then are verified and determined by methods such as hydraulic calculation or model test, and the like, so that the demonstration workload is large, and the input time and cost are high.
Therefore, it is necessary to research and provide a feasibility judgment standard for the energy dissipation of the natural water cushion in the narrow river valley high dam, and to initially judge the feasibility of the energy dissipation of the natural water cushion in the early stage of the flood discharge energy dissipation design, so as to be beneficial to quickly determining the research thought and the main research direction of the flood discharge energy dissipation design scheme, greatly reduce the workload of comparing and selecting the design scheme, accelerate the design progress, and reduce the design difficulty and the design cost.
Disclosure of Invention
The invention provides a feasibility judgment standard for energy dissipation of a natural water cushion for a narrow valley dam based on an energy dissipation safety index, which aims to overcome the defects of the feasibility judgment method for the energy dissipation of the natural water cushion adopted by the existing narrow valley dam engineering, facilitate the quick initial judgment of the feasibility of the natural water cushion adopted by the engineering in the early stage of flood discharge and energy dissipation design, reduce the workload of comparing and selecting the design scheme, accelerate the design progress and reduce the design difficulty and the design cost.
The method for distinguishing the energy consumption of the natural water cushion is divided into two steps. Step one, energy dissipation safety index calculation; step two is the judgment of the energy dissipation feasibility of the natural water cushion
The method comprises the following steps: energy dissipation safety index calculation
And (3) researching flood discharge scale, energy dissipation hydraulic performance, rock mass impact resistance conditions of the energy dissipation area and the like of the narrow river valley high dam project, and calculating the energy dissipation safety index.
(1) Calculation of unit water body energy dissipation rate and energy dissipation area bedrock impact flow velocity
Firstly, the method comprises the following steps: calculating the discharge flow, the flood discharge head fall, the flood discharge power and the water volume of the energy dissipation area under different working conditions according to the pivot arrangement of the project and the design condition of the flood discharge building, and calculating the energy dissipation rate of the unit water body of the energy dissipation area under each working condition according to the discharge flow, the flood discharge head fall, the flood discharge power and the water volume of the energy dissipation area.
Secondly, the method comprises the following steps: and (4) determining the value of the impact flow velocity of the rock mass in the energy dissipation area according to the topographic and geological conditions and the physical and mechanical properties of the rock mass in the energy dissipation area.
(2) Energy dissipation safety index calculation
The energy dissipation safety index calculation formula is as follows:
wherein, W is an energy dissipation safety index and is dimensionless; e is the unit water energy consumption rate (kW/m)3)；V0The flow velocity (m/s) of the rock mass in the energy dissipation area is the impact flow velocity; gamma is the unit weight (kN/m) of water in the energy dissipation area3)。
Step two: judgment of energy dissipation feasibility of natural water cushion
And judging the feasibility of the engineering for adopting the natural water cushion for energy dissipation based on the energy dissipation safety index W obtained by calculation in the step one. The discrimination method comprises the following steps:
(1) if the energy dissipation safety index W of the project is more than 4.0, the energy dissipation by adopting the natural water cushion is feasible, and the natural water cushion energy dissipation can be considered as an important scheme to carry out further design and research work.
(2) If the energy dissipation safety index W of the project is less than or equal to 4.0, the design difficulty of adopting the natural water cushion for energy dissipation is larger. When the natural water cushion energy dissipation scheme is planned to be selected due to the condition limitation of the engineering, reliable engineering measures are needed to be taken to control the pit flushing depth and the pit flushing form, and the stability of the bank slope and the operation safety of the power station are ensured.
The judgment standard 4.0 in the second step is obtained by performing statistical analysis on the energy dissipation safety indexes of the existing built and under-built projects, as shown in table 1 and fig. 1.
Table 1 statistical table of energy dissipation safety index of high dam engineering in narrow river valley at home and abroad
According to the statistical comparison of the energy dissipation safety indexes of the existing narrow river valley high dam engineering, the following conclusion can be obtained:
(1) the high dam engineering of the full-lining artificial plunge pool is adopted, and except that the energy dissipation safety index of individual engineering is larger, the energy dissipation safety indexes of other engineering are all smaller than 4.0;
(2) the high dam engineering using natural water cushion energy dissipation has energy dissipation safety indexes of all other engineering more than 4.0 except that the energy dissipation safety index of the extremely individual engineering (such as water buffet) is smaller.
(3) The energy dissipation safety index of the hydrobelock engineering is small (W is 2.35), but the design difficulty is large due to the fact that the natural water cushion energy dissipation scheme is adopted in comparison and selection due to the limitation of engineering conditions; in the flood discharge and energy dissipation design, a step-type outlet energy dissipater of a subarea steep groove narrow slit flip bucket is adopted, the lower part of the narrow slit flip bucket is additionally provided with a small fillet for adjusting the water wing outflow direction, and the asymmetric narrow slit side wall is arranged for controlling the water flow to smoothly return to the groove, and meanwhile, an underground continuous wall type anti-elutriation wall structure as deep as 40m is arranged in a downstream energy dissipation area. By implementing the complicated and reliable engineering measures, the pit flushing depth and the pit flushing form are controlled, so that the bank slope stability and the power station operation safety are ensured.
The method for judging the feasibility of natural water cushion energy dissipation provides a judgment standard for the adoption of a natural water cushion energy dissipation type in the narrow valley dam engineering for the first time, and fills the technical gap of adopting the natural water cushion energy dissipation judgment standard in the narrow valley dam. The method breaks through the limitation that the scheme is only preliminarily simulated according to engineering analogy and practical experience in the conventional energy dissipation scheme comparison and selection research process, can help the engineering to quickly determine the research thought and the main research direction of the flood discharge and energy dissipation design scheme, greatly reduces the comparison and selection demonstration workload of the design scheme, accelerates the design progress, and reduces the design difficulty and the design cost.
Drawings
FIG. 1 is a graph comparing an engineering project with an energy dissipation safety index;
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the invention is not limited thereto, and is given by way of example only; while the advantages of the invention will be apparent and readily appreciated by the description.
The method for distinguishing the energy consumption of the natural water cushion is divided into two steps. Step one, energy dissipation safety index calculation; and step two, judging the energy dissipation feasibility of the natural water cushion.
The method comprises the following steps: energy dissipation safety index calculation
And (3) researching flood discharge scale, energy dissipation hydraulic performance, rock mass impact resistance conditions of the energy dissipation area and the like of the narrow river valley high dam project, and calculating the energy dissipation safety index.
(1) Calculation of unit water body energy dissipation rate and energy dissipation area bedrock impact flow velocity
Firstly, the method comprises the following steps: calculating the discharge flow, the flood discharge head fall, the flood discharge power and the water volume of the energy dissipation area under different working conditions according to the pivot arrangement of the project and the design condition of the flood discharge building, and calculating the energy dissipation rate of the unit water body of the energy dissipation area under each working condition according to the discharge flow, the flood discharge head fall, the flood discharge power and the water volume of the energy dissipation area.
Secondly, the method comprises the following steps: and (4) determining the value of the impact flow velocity of the rock mass in the energy dissipation area according to the topographic and geological conditions and the physical and mechanical properties of the rock mass in the energy dissipation area.
(2) Energy dissipation safety index calculation
The energy dissipation safety index calculation formula is as follows:
wherein, W is an energy dissipation safety index and is dimensionless; e is the unit water energy consumption rate (kW/m)3)；V0The flow velocity (m/s) of the rock mass in the energy dissipation area is the impact flow velocity; gamma is the unit weight of water in the energy dissipation area (gamma is 10 kN/m)3)。
Step two: judgment of energy dissipation feasibility of natural water cushion
And judging the feasibility of the engineering for adopting the natural water cushion for energy dissipation based on the energy dissipation safety index W obtained by calculation in the step one. The discrimination method comprises the following steps:
(1) if the energy dissipation safety index W of the project is more than 4.0, the energy dissipation by adopting the natural water cushion is feasible, and the natural water cushion energy dissipation can be considered as an important scheme to carry out further design and research work.
(2) If the energy dissipation safety index W of the project is less than or equal to 4.0, the design difficulty of adopting the natural water cushion for energy dissipation is larger. When the natural water cushion energy dissipation scheme is planned to be selected due to the condition limitation of the engineering, reliable engineering measures are needed to be taken to control the pit flushing depth and the pit flushing form, and the stability of the bank slope and the operation safety of the power station are ensured.
The judgment standard 4.0 in the second step is obtained by performing statistical analysis on the energy dissipation safety indexes of the existing built and under-built projects, as shown in table 1, fig. 1 and fig. 2.
According to the statistical comparison of the energy dissipation safety indexes of the existing narrow river valley high dam engineering, the following conclusion can be obtained:
(1) the high dam engineering of the full-lining artificial plunge pool is adopted, and except that the energy dissipation safety index of individual engineering is larger, the energy dissipation safety indexes of other engineering are all smaller than 4.0;
(2) the high dam engineering using natural water cushion energy dissipation has energy dissipation safety indexes of all other engineering more than 4.0 except that the energy dissipation safety index of the extremely individual engineering (such as water buffet) is smaller.
(3) The energy dissipation safety index of the hydrobelock engineering is small (W is 2.35), but the design difficulty is large due to the fact that the natural water cushion energy dissipation scheme is adopted in comparison and selection due to the limitation of engineering conditions; in the flood discharge and energy dissipation design, a step-type outlet energy dissipater of a subarea steep groove narrow slit flip bucket is adopted, the lower part of the narrow slit flip bucket is additionally provided with a small fillet for adjusting the water wing outflow direction, and the asymmetric narrow slit side wall is arranged for controlling the water flow to smoothly return to the groove, and meanwhile, an underground continuous wall type anti-elutriation wall structure as deep as 40m is arranged in a downstream energy dissipation area. By implementing the complicated and reliable engineering measures, the pit flushing depth and the pit flushing form are controlled, so that the bank slope stability and the power station operation safety are ensured.
The method for judging the feasibility of natural water cushion energy dissipation provides a judgment standard for the adoption of a natural water cushion energy dissipation type in the narrow valley dam engineering for the first time, and fills the technical gap of adopting the natural water cushion energy dissipation judgment standard in the narrow valley dam. The method breaks through the limitation that the scheme is only preliminarily simulated according to engineering analogy and practical experience in the conventional energy dissipation scheme comparison and selection research process, can help the engineering to quickly determine the research thought and the main research direction of the flood discharge and energy dissipation design scheme, greatly reduces the comparison and selection demonstration workload of the design scheme, accelerates the design progress, and reduces the design difficulty and the design cost.
Claims (3)
1. The discrimination method for the energy dissipation of the natural water cushion is characterized by comprising two steps,
the method comprises the following steps: energy dissipation safety index calculation
(1) Calculation of unit water body energy dissipation rate and energy dissipation area bedrock impact flow velocity
Firstly, the method comprises the following steps: calculating the downward discharge flow, the fall of a flood discharge head, the flood discharge power and the water volume of the energy dissipation area under different working conditions according to the pivot arrangement of the engineering and the design condition of a flood discharge building, and calculating the energy dissipation rate of the unit water body of the energy dissipation area under each working condition according to the calculated values;
secondly, the method comprises the following steps: determining the value of the anti-impact flow rate of the rock mass in the energy dissipation area according to the topographic and geological conditions and the physical and mechanical properties of the rock mass in the energy dissipation area;
(2) energy dissipation safety index calculation
The energy dissipation safety index calculation formula is as follows:
wherein, W is an energy dissipation safety index and is dimensionless; e is the unit water body energy consumption rate, unit: kW/m3；V0The unit is the flow velocity of the rock mass in the energy dissipation area: m/s; gamma is the unit weight of water in the energy dissipation area: kN/m3；
Step two: energy dissipation discrimination of natural water cushion
Judging whether natural water cushion energy dissipation is adopted in the engineering or not based on the energy dissipation safety index W obtained by calculation in the step one; the discrimination method comprises the following steps:
(1) if the energy dissipation safety index W of the project is more than 4.0, the energy dissipation by adopting the natural water cushion is feasible, and the natural water cushion energy dissipation can be considered as a scheme for further design;
(2) if the energy dissipation safety index W of the project is less than or equal to 4.0, the design difficulty of adopting the natural water cushion for energy dissipation is larger; when the natural water cushion energy dissipation scheme is planned to be selected due to the condition limitation of the engineering, reliable engineering measures are needed to be taken to control the pit flushing depth and the pit flushing form, and the stability of the bank slope and the operation safety of the power station are ensured.
2. The method for distinguishing energy consumption of natural water cushion according to claim 1, wherein the method comprises
The judgment standard 4.0 in the second step is obtained by carrying out statistical analysis on the energy dissipation safety indexes of the existing built and under-built projects.
3. The method for discriminating the energy consumption of natural water cushion according to claim 1, wherein:
the energy dissipation safety index W of the engineering is more than 4.0, and on the basis of adopting natural water cushion energy dissipation, a flat-bottom full-lining water cushion pond or a bank protection non-bottom-protection water cushion pond mode can be further adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464385.2A CN111622188B (en) | 2020-05-27 | 2020-05-27 | Discrimination method for energy dissipation by adopting natural water cushion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464385.2A CN111622188B (en) | 2020-05-27 | 2020-05-27 | Discrimination method for energy dissipation by adopting natural water cushion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111622188A true CN111622188A (en) | 2020-09-04 |
| CN111622188B CN111622188B (en) | 2021-09-03 |
Family
ID=72257422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010464385.2A Active CN111622188B (en) | 2020-05-27 | 2020-05-27 | Discrimination method for energy dissipation by adopting natural water cushion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111622188B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU971994A1 (en) * | 1979-11-28 | 1982-11-07 | Среднеазиатское Отделение Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука | Spillway |
| US6588370B1 (en) * | 2001-10-03 | 2003-07-08 | The United States Of America As Represented By The Secretary Of The Interior | Labyrinth weir and pool fishway |
| CN101555687A (en) * | 2009-05-12 | 2009-10-14 | 中国水电顾问集团西北勘测设计研究院 | High-geostress narrow-valley inverted arch plunge pool and design method thereof |
| CN107354909A (en) * | 2017-09-04 | 2017-11-17 | 长江勘测规划设计研究有限责任公司 | The permeable side slope plate simulation micro tribology forces testing system and method for cushion pool |
| CN111121854A (en) * | 2019-12-31 | 2020-05-08 | 南昌工程学院 | Device for measuring energy dissipation rate of trajectory jet energy dissipater and using method |
-
2020
- 2020-05-27 CN CN202010464385.2A patent/CN111622188B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU971994A1 (en) * | 1979-11-28 | 1982-11-07 | Среднеазиатское Отделение Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука | Spillway |
| US6588370B1 (en) * | 2001-10-03 | 2003-07-08 | The United States Of America As Represented By The Secretary Of The Interior | Labyrinth weir and pool fishway |
| CN101555687A (en) * | 2009-05-12 | 2009-10-14 | 中国水电顾问集团西北勘测设计研究院 | High-geostress narrow-valley inverted arch plunge pool and design method thereof |
| CN107354909A (en) * | 2017-09-04 | 2017-11-17 | 长江勘测规划设计研究有限责任公司 | The permeable side slope plate simulation micro tribology forces testing system and method for cushion pool |
| CN111121854A (en) * | 2019-12-31 | 2020-05-08 | 南昌工程学院 | Device for measuring energy dissipation rate of trajectory jet energy dissipater and using method |
Non-Patent Citations (5)
| Title |
|---|
| JINGJIE FENG等: "Operational regulation of a hydropower cascade based on the mitigation of the total dissolved gas supersaturation", 《ECOLOGICAL INDICATORS》 * |
| 刘沛清等: "水垫塘的水流特征及其综合评价指标", 《长江科学院院报》 * |
| 张良骞: "构皮滩水利枢纽水垫塘消能安全性分析", 《人民长江》 * |
| 杨启贵等: "水布垭水电站泄洪消能设计创新与实践", 《人民长江》 * |
| 韩喜俊等: "乌东德水电站泄洪消能特点及水工模型试验研究", 《湖北水力发电》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111622188B (en) | 2021-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110046469B (en) | Method for calculating erosion-deposition deformation of riverbed in front of hydropower station dam under multi-constraint condition | |
| CN109657281A (en) | A kind of drainage trough excavates the damming dam breaking mechanism analysis method of measure | |
| CN112749475B (en) | Analysis method for determining continuous dam break risk of cascade reservoir group | |
| CN107133393A (en) | Passage pressure break well and story selecting and dynamic parameter Optimization Design | |
| Heng et al. | Prediction formulas of maximum scour depth and impact location of a local scour hole below a chute spillway with a flip bucket | |
| Niu | Key Technologies of the hydraulic structures of the Three Gorges project | |
| CN111622188B (en) | Discrimination method for energy dissipation by adopting natural water cushion | |
| CN111622187B (en) | Prediction method for pit-punching depth of distributed trajectory jet energy dissipater | |
| CN113742820A (en) | Numerical simulation method for analyzing energy dissipation effect of flood diversion tunnel outlet stilling basin | |
| CN113837529A (en) | River bank slope collapse risk assessment method | |
| CN111563353B (en) | Method for simulating influence of flood discharge water tongue on river channel and mound morphology | |
| CN204644993U (en) | A kind of shaft structure being communicated with outlet structure escape works | |
| CN109252494B (en) | A kind of deformation type stilling pond front end energy-dissipating structure and its energy dissipating method | |
| CN107085635B (en) | Method for judging worst operation condition of sluice through mathematical model | |
| CN104895022A (en) | Shaft structure communicated with release structures and flood discharge method | |
| CN111651820B (en) | Energy dissipation assessment method for coupling unit water body energy dissipation rate and bedrock impact flow velocity | |
| CN107451334A (en) | Dam gate floor downstream connection segment body shape and its draft method | |
| CN113627050A (en) | Method for optimizing river channel scouring undercut treatment scheme | |
| CN207405596U (en) | Suitable for the spillway combined energy dissipation structure of narrow river bed | |
| Li et al. | Numerical Simulation of Stepped Spillways with Front Step Deformation | |
| CN110835906B (en) | Method for determining bottom elevation of anti-impact rotary excavating pile of flood discharge outlet river bank | |
| Lesleighter et al. | Plunge pool rock scour experiences and analysis techniques | |
| Prokof’ev et al. | Hybrid simulation of hydrodynamics of hydroelectric power plant spillway structures | |
| Wüthrich et al. | Behaviour of a scour protection overlay with randomly distributed concrete prisms in plunge pools downstream of mobile barrages for exceptional operation conditions | |
| CN114117610B (en) | Arch dam foundation geology asymmetry processing design method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |