CN104732112B - A kind of antiknock means of defence for being used to improve concrete gravity dam security performance - Google Patents
A kind of antiknock means of defence for being used to improve concrete gravity dam security performance Download PDFInfo
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Abstract
The invention discloses a kind of antiknock means of defence for being used to improve concrete gravity dam security performance, including step：Step 1, the characteristic parameter of concrete gravity dam is obtained according to actual conditions；Step 2, underwater explosion fully-coupled model corresponding to different reservoir levels is established using Lagrangian Euler's unity couping method respectively, spatial distribution characteristic is injured based on concrete gravity dam corresponding to the different reservoir levels of underwater explosion fully-coupled model progress numerical computations acquisition；Step 3, concrete gravity dam corresponding to different reservoir levels is injured into spatial distribution characteristic to be analyzed, it is optimal that acquisition reservoir level is located at concrete gravity dam anti-explosion safety performance when below the folded slope elevation of dam downstream；Step 4, reservoir level is reduced to below the folded slope elevation of dam downstream by wartime.The present invention is workable, it is easy to accomplish, extra funds expenditure is small, can be obviously improved the concrete gravity dam capability of antidetonance, is particularly suitable for use in and improves the antiknock security performance of built concrete gravity dam.
Description
Technical field
The present invention relates to a kind of antiknock means of defence for being used to improve concrete gravity dam security performance, suitable for wartime dam
The antiknock security protection of body.
Background technology
In recent years, attack of terrorism activity worldwide takes place frequently, and has the concrete gravity of obvious political economy benefit
Dam turns into the key point strike target of terrorist.China is in high dam fast development period, the height of large quantities of 100-300m levels
Dam is completed or built, as the Huang in Longyangxia Hydroelectric Power Station (178m), ERTAN Hydroelectric ProJect (240m), the Lancang River steps on water power
(202m), white crane beach power station (284m) etc., these dam water levels are high, storage capacity is big, once accident downstream will be caused it is huge
Casualties and property loss, therefore reinforcement dam antiknock protection, reduction dam risk of loss have its own strategic significance.
In the prior art, the antiknock protection for dam is mainly carried out in terms of active defense and passive protection two, main
Move anti-finger shield and active interception, strike carried out to guided missile using various new and high technologies, interception guided missile is directly such as set up around high dam,
To prevent remote core from attacking, but if enemy is not direct attack dam, but reservoir ignition nuclear bomb is formed under water a long way off
Shock wave hits dam, is difficult to carry out greatly very much due to intercepting scope.Passive protection refers to passively improves dam using engineering measure
The capability of antidetonance, as dam weak part arrangement of reinforcement reinforce, from protective layer, but these antiknock means of defences for be completed high dam
For operability is not strong, is difficult to.
The content of the invention
In view of the deficienciess of the prior art, the invention provides it is a kind of it is workable, be easily achieved, mixed for improving
The antiknock means of defence of native gravity dam security performance is coagulated, be particularly suitable for use in built concrete gravity dam.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of antiknock means of defence for being used to improve concrete gravity dam security performance, including step：
Step 1, the characteristic parameter of concrete gravity dam, including crest elevation, dam bottom elevation, storehouse are obtained according to actual conditions
Area's normal pool level elevation, reservoir area level of dead water elevation, abutment height, width at dam crest and dam bottom width degree；
Step 2, the characteristic parameter obtained based on step 1, difference is established using Lagrange-Euler's unity couping method respectively
Underwater explosion fully-coupled model corresponding to reservoir level, described different reservoir levels include normal pool level, level of dead water, dam downstream
Folded slope elevation, the following water level of dam downstream folded slope elevation；Numerical computations are carried out based on underwater explosion fully-coupled model and obtain difference
Concrete gravity dam injures spatial distribution characteristic corresponding to reservoir level；
Step 3, concrete gravity dam corresponding to different reservoir levels is injured into spatial distribution characteristic to be analyzed, obtained
It is optimal that reservoir level is located at concrete gravity dam anti-explosion safety performance when below the folded slope elevation of dam downstream；
Step 4, reservoir level is reduced to below the folded slope elevation of dam downstream by wartime.
The process of establishing of underwater explosion fully-coupled model is specially in step 2：
Storehouse water, air and explosive are modeled using Eulerian mesh, and dam and basement rock are modeled using Lagrangian mesh, storehouse water with
Using Lagrange-Euler's unity couping method modeling between the dam foundation.
In step 2, numerical computations are carried out by nonlinear dynamic analysis platform AUTODYN, obtain the full coupling of each underwater explosion
Concrete gravity dam corresponding to matched moulds type injures spatial distribution characteristic.
The present invention is by building the underwater explosion fully-coupled model under different reservoir levels, so as to obtain corresponding to each reservoir level
Concrete gravity dam injures spatial distribution characteristic；Space point is injured by concrete gravity dam corresponding to each reservoir level of comparative analysis
Boot levy existing reduction reservoir level can improve dam antiknock security performance, reduce dam under water Blast Load effect under
Damage and failure scope.Through the damage and failure region under further analysis dam under water explosion wave load action, find big
Damage and failure is the most serious at the folded slope of dam downstream, when reservoir level is down to below the folded slope elevation of dam downstream, because the water surface is cut off
Effect, shock wave energy are propagated and blocked, and dam body more than table, which sustains damage, also accordingly to be reduced.Therefore, to coagulation
For native gravity dam, wartime can be discharged water by early warning to reduce below reservoir level to dam downstream folded slope elevation, big so as to reduce
Dam failure risk of loss.
Compared to the prior art, the invention has the advantages that and beneficial effect：
It is workable, it is easy to accomplish, extra funds expenditure is small, can be obviously improved the concrete gravity dam capability of antidetonance, especially
It is applied to built concrete gravity dam.
Brief description of the drawings
Fig. 1 is the calculation flow chart of Lagrangian-Eulerian (Lagrange-Euler) unity couping method；
Fig. 2 is the underwater explosion fully-coupled model that reservoir level is located at normal pool level；
Fig. 3 is that the dam body that reservoir level is located at normal pool level injures spatial distribution characteristic figure；
Fig. 4 is that the dam body that reservoir level is located at level of dead water injures spatial distribution characteristic figure；
Fig. 5 is that the dam body that reservoir level is located at the folded slope elevation of dam downstream injures spatial distribution characteristic figure；
Fig. 6 is that reservoir level is located at below the folded slope elevation of dam downstream that dam body injures spatial distribution characteristic figure at 10m；
Fig. 7 is that reservoir level is located at below the folded slope elevation of dam downstream that dam body injures spatial distribution characteristic figure at 20m.
In figure, 1- air；2- storehouses water；3- concrete gravity dams；4- basement rock；5-TNT explosives.
Embodiment
The specific embodiment of the invention is further illustrated below in conjunction with accompanying drawing.
The inventive method comprises the following steps that：
Step 1, each characteristic parameter of concrete gravity dam is determined according to actual conditions.
Described characteristic parameter mainly includes crest elevation, dam bottom elevation, reservoir area normal pool level elevation, reservoir area level of dead water
Elevation, abutment height, width at dam crest, dam bottom width degree.
Step 2, according to TNT explosive equivalent W and TNT the explosive density ρ used in underwater explosion numerical simulation, TNT is calculated
The equivalent sphere radius of explosive
Actual explosive may be simultaneously aspherical, keeps quality of explosive constant by its equivalent globulate explosive, according to spheroid volume
Formula, the equivalent sphere of explosive is calculated according to the TNT explosive equivalent W and TNT explosive densities ρ used in underwater explosion numerical simulation
Radius
Step 3, the explosive equivalent sphere radius that each characteristic parameter and step 2 determined based on step 1 is determined, is used
Lagrangian-Eulerian (Lagrange-Euler) unity couping method establish reservoir level be located at it is underwater at normal pool level
Explode fully-coupled model, wherein, storehouse water, air and TNT explosives are modeled using Eulerian mesh, and dam and basement rock are using Lagrange
Mesh modeling, modeled using Lagrangian-Eulerian unity coupings method between storehouse water and the dam foundation, put down by nonlinear dynamic analysis
Platform AUTODYN carries out numerical computations, obtains concrete gravity dam and injures spatial distribution characteristic.
Step 4, the explosive equivalent sphere radius that each characteristic parameter and step 2 determined according to step 1 determines, is used
Lagrangian-Eulerian (Lagrange-Euler) unity couping method establishes the underwater explosion that reservoir level is located at level of dead water
Fully-coupled model, construction method of the modeling method with underwater explosion fully-coupled model described in step 3；Then, by non-linear
Kinematic analysis platform AUTODYN carries out numerical computations, obtains concrete gravity dam and injures spatial distribution characteristic.
Step 5, the explosive equivalent sphere radius that each characteristic parameter and step 2 determined according to step 1 determines, is used
Lagrangian-Eulerian (Lagrange-Euler) unity couping method establishes reservoir level and is located at dam downstream folded slope height respectively
At journey, below the folded slope elevation of dam downstream in the range of 0~40m 2~4 preset water level points underwater explosion fully-coupled model, build
Construction method of the mould method with underwater explosion fully-coupled model described in step 3；Then, concrete weight is obtained by numerical computations
Injure spatial distribution characteristic in power dam.
Step 6, the concrete gravity dam that step 3~5 obtain is injured into spatial distribution characteristic to be analyzed, finds storehouse
When water level is reduced to below the folded slope elevation of dam downstream, dam safety performance is remarkably improved, and is at the folded slope elevation of dam downstream
Security performance catastrophe point, when reservoir level is higher than at the folded slope elevation of dam downstream, dam body dynamic response is strong.Therefore, can pass through by
Current reservoir level is reduced to below the folded slope elevation of dam downstream to significantly improve dam antiknock security performance.
Concrete gravity dam, which injures spatial distribution characteristic, can reflect the anti-explosion safety performance of dam, it is possible to pass through and compare
Concrete gravity dam corresponding to different reservoir levels injures spatial distribution characteristic, to obtain the anti-explosion safety of dam body under different reservoir levels
Performance.
Embodiments of the invention are provided below.
Step 1, each characteristic parameter of certain concrete gravity dam is obtained：Crest elevation 1796m, dam bottom elevation 1676m, reservoir area is just
Normal water storage level elevation 1791m, reservoir area level of dead water elevation 1746m, abutment height 20m, width at dam crest 15m, dam bottom width degree 90m.
Step 2, for 306kg, TNT explosive densities ρ is the TNT explosive equivalent W used in underwater explosion numerical simulation
1.62g/cm3, calculate the equivalent TNT explosive radiuses r=0.64m into after spheroid.
Step 3, the explosive equivalent sphere radius that each characteristic parameter and step 2 obtained according to step 1 determines, establishes storehouse water
Underwater explosion fully-coupled model of the position at normal pool level, as shown in Figure 1；Number is passed through based on underwater explosion fully-coupled model
Value is calculated dam and injures spatial distribution characteristic, and as shown in Figure 3, left injured value 0~1 represents concrete gravity dam in legend
Damage and failure state never occurs for unit to complete collapse state, and dam body is can be seen that according to dam damage and failure situation in figure
Chief destructive region is at the folded slope of dam downstream.
Step 4, the explosive equivalent sphere radius that each characteristic parameter and step 2 obtained according to step 1 determines, establishes storehouse water
Underwater explosion fully-coupled model of the position at level of dead water, dam is obtained based on underwater explosion fully-coupled model by numerical computations
Spatial distribution characteristic is injured, as shown in Figure 4, with Fig. 3 comparative analyses it can be found that when reservoir level is reduced to level of dead water, dam
Damage envelope reduces significantly, and dam antiknock security performance is significantly improved.
Step 5, the explosive equivalent sphere radius that each characteristic parameter and step 2 obtained according to step 1 determines, is established respectively
Reservoir level is located at the folded slope elevation of dam downstream, 10m below the folded slope elevation of dam downstream, 20m below the folded slope elevation of dam downstream
Underwater explosion fully-coupled model, dam is obtained by numerical computations based on obtained underwater explosion fully-coupled model and injures space point
Cloth feature, respectively as shown in Fig. 5~7, the numerical result with step 3~4, i.e. Fig. 3~4 are analyzed.
Step 6, according to comparative analysis, it is found that as reservoir level reduces, dam damage and failure scope is gradually reduced,
Dam antiknock security performance is improved；When reservoir level is reduced to below the folded slope elevation of dam downstream, dam antiknock security
It can be significantly improved.
Claims (3)
1. a kind of antiknock means of defence for being used to improve concrete gravity dam security performance, it is characterised in that including step：
Step 1, the characteristic parameter of concrete gravity dam is obtained according to actual conditions, including crest elevation, dam bottom elevation, reservoir area are just
Normal water storage level elevation, reservoir area level of dead water elevation, abutment height, width at dam crest and dam bottom width degree；
Step 2, according to TNT explosive equivalent W and TNT the explosive density ρ used in underwater explosion numerical simulation, TNT explosives are calculated
Equivalent sphere radius
Step 3, based on step 1 obtain characteristic parameter and step 2 determine explosive equivalent sphere radius, using Lagrange-
Euler's unity couping method establishes underwater explosion fully-coupled model corresponding to different reservoir levels respectively, and described different reservoir levels include
Normal pool level, level of dead water, dam downstream folded slope elevation, the following water level of dam downstream folded slope elevation；Based on the full coupling of underwater explosion
Concrete gravity dam corresponding to the different reservoir levels of matched moulds type progress numerical computations acquisition injures spatial distribution characteristic；
Step 4, concrete gravity dam corresponding to different reservoir levels is injured into spatial distribution characteristic to be analyzed, obtains storehouse water
Concrete gravity dam anti-explosion safety performance is optimal when position is below the folded slope elevation of dam downstream；
Step 5, reservoir level is reduced to below the folded slope elevation of dam downstream by wartime.
2. the antiknock means of defence as claimed in claim 1 for being used to improve concrete gravity dam security performance, it is characterised in that：
The process of establishing of underwater explosion fully-coupled model is specially in step 3：
Storehouse water, air and explosive are modeled using Eulerian mesh, and dam and basement rock are modeled using Lagrangian mesh, storehouse water and the dam foundation
Between using the modeling of Lagrange-Euler's unity couping method.
3. the antiknock means of defence as claimed in claim 1 for being used to improve concrete gravity dam security performance, it is characterised in that：
In step 3, numerical computations are carried out by nonlinear dynamic analysis platform AUTODYN, obtain each underwater explosion unity couping mould
Concrete gravity dam injures spatial distribution characteristic corresponding to type.
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| CN105787258A (en) * | 2016-02-17 | 2016-07-20 | 武汉大学 | Method for rapidly predicting shallow-water explosion impact damage level of concrete gravity dam |
| CN107832544B (en) * | 2017-11-23 | 2020-11-03 | 大连理工大学 | Method for predicting damage of AP1000 nuclear power shielding plant under impact load |
| CN108265682B (en) * | 2018-01-11 | 2019-09-10 | 武汉大学 | The method of dam and the raising dam capability of antidetonance with the high capability of antidetonance |
| CN110487133A (en) * | 2019-07-30 | 2019-11-22 | 中国人民解放军海军工程大学 | The anti-damage effectiveness analysis method of explosive assembly casing and device |
| CN112001631B (en) * | 2020-08-24 | 2024-01-09 | 郑州大学 | Method for evaluating safety state of high arch dam under impact of underwater contact explosion load |
| CN114357557B (en) * | 2021-10-29 | 2024-04-02 | 武汉大学 | Anti-overturning stable safety evaluation method for concrete gravity dam damaged by penetration explosion |
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