CN105507219B - A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack - Google Patents
A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack Download PDFInfo
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- CN105507219B CN105507219B CN201510894882.5A CN201510894882A CN105507219B CN 105507219 B CN105507219 B CN 105507219B CN 201510894882 A CN201510894882 A CN 201510894882A CN 105507219 B CN105507219 B CN 105507219B
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- tensile strength
- dam
- concrete
- preset
- gallery
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention provides a kind of method for preventing concrete dam gallery crown and bottom slab crack, including：Step 1, it is determined that the process for allowing tensile strength and allowing tensile strength to change over time；Step 2, obtains dam corridor position stress distribution, yield region distribution and stress distribution, yield region and is distributed the rule for changing over time；Step 3, obtains gallery vault and underplate concrete tension beyond the scope and depth for allowing tensile strength；Step 4, determines position, the depth and width of preset seam；Step 5, lays preset seam, obtains the preset stress distribution after setting that sews cloth in dam corridor position, yield region distribution and stress distribution, yield region and is distributed the rule for changing over time；Step 6, it is determined whether having more than concrete allows the region of tensile strength；Step 7, it is determined that the form of final preset seam.The present invention is by arranging gallery longitudinally preset seam, it is therefore prevented that the cracking of gallery concrete, improves dam work condition.
Description
Technical field
The present invention relates to concrete dam construction field, specifically, be related to one kind prevent concrete dam gallery crown and
The method of bottom slab crack.
Background technology
Concrete dam, is one of most important dam type, and worldwide widely distributed, quantity is more, and general height of dam compared with
It is high.Concrete dam has played important in terms of flood control safety, water supply security, grain security, energy security and ecological safety is ensured
Effect, it is ensured that hydro plant with reservoir dam safety is extremely important for the country and people masses.
In concrete dam, especially in high dam, to carry out foundation grouting, draining, safety monitoring, maintenance and inspection, operation
Traffic etc. in operation and dam, can typically set gallery at different height inside dam, such as foundation grouting gallery, collector drain and
Access gallery etc..At present quantity gallery not etc. is arranged in country's high concrete gravity dam and arch dam.
Dam height is big, and vertical pressure is very big, while bearing huge upstream water pressure, stress level is high, in dam
Gallery stress level is also very high, once stress level exceedes concrete tensile strength, concrete will ftracture, especially gallery top
Arch and base plate position.It is built and in high dam is built roof arch of gallery and bottom occur crack phenomenon it is very universal, be especially located at
The gallery of dam middle and lower part elevation.The main reason of this roof arch of gallery and soleplate crack is excessive gravity pressure, so that
Osseotomy site top and bottom stress are exceeded.
Although crown and base plate longitudinal crack are general little to structure security implication in gallery, but still structure partial can be answered
Power is impacted and reduces internal reinforcing bar and concrete material durability, to prevent crack from developing and being mutually communicated to depths,
Need to carry out Chemical Grouting Treatment, so as to cause time and waste economically, therefore take certain measure and the method to prevent corridor
Road cracking is necessary.
The content of the invention
Phenomenon it is an object of the invention to be directed to high concrete gallery generally existing crown and soleplate crack, proposes a kind of
Roof arch of gallery and base plate lateral stress can be reduced, the method so as to prevent or reduce concrete cracking, to improve inside dam
Local stress state.
Concrete technical scheme is as follows：
A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack, comprises the following steps：
Step 1, according to dam concrete placement situation, it is determined that allowing tensile strength and allowing tensile strength anaplasia at any time
The process of change；
Step 2, the basic data according to dam obtains dam using finite element method or Elasticity method
The rule that gallery position stress distribution, yield region distribution and stress distribution, yield region distribution are changed over time；Wherein, dam
The basic data of dam body includes：Architectural feature, arrangement of reinforcement situation, casting process, Arch Dam With Joint envelope arch process, concrete and peripheral ring
Border temperature changing process, storehouse water water level uphill process and linear expansion coefficient and elastic modelling quantity parameter；
Step 3, by comparing gallery edge stress with the size for allowing tensile strength or according to yield region size, obtains
Gallery vault and underplate concrete tension are beyond the scope and depth for allowing tensile strength；
Step 4, according to the roof arch of gallery and underplate concrete for obtaining beyond the scope and depth for allowing tensile strength, it is determined that
The position of preset seam, depth and width；
Step 5, according to determine preset seam position, depth and width, and step 1 determine permission tensile strength and
The process for allowing tensile strength to change over time, lays preset seam, and obtain big using finite element method or Elasticity method
The preset stress distribution after setting that sews cloth in dam gallery position, yield region distribution and stress distribution, yield region distribution are changed over time
Rule；
Step 6, the relatively more preset gallery edge stress after setting that sews cloth is with the size for allowing tensile strength or according to preset
Sew cloth and set rear gallery yield region size, it is determined whether having more than concrete allows the region of tensile strength, if so, then according to step
The form of 4 pairs of preset seams is adjusted, and increases the depth of preset seam or increases preset seam bar number；
Step 7, repeat step 5,6 are until gallery edge stress is being allowed in the range of tensile strength or without surrender, it is determined that in advance
Put the form of seam.
Further, tensile strength is allowed described in step 1 includes that concrete age morning allows tensile strength and long-term permission
Tensile strength；Wherein, it is the amount of changing with time that concrete age morning allows tensile strength, and age is after 180 days with for a long time
Tensile strength is allowed, concrete age morning tensile strength formula is used：
Rt=R0τ/(α+τ)；
Wherein RtIt is early age strength, R0Tensile strength is allowed for long-term, τ is the age in terms of day, and α is coefficient.
Further, when the basic data of dam in step 2 changes, dam corridor position stress is reacquired
The rule that distribution, yield region distribution and stress distribution, yield region distribution are changed over time.
Further, the correlation computations of concrete yield region use the yield criterion with tensile strength, including two parameter rules,
Four parameter rules and five parameter rules.
Further, in step 4, the position of preset seam is located at the center of yield region, or tension maximum position；It is preset
The depth of seam is identical with the depth capacity of yield region, or identical with the depth capacity more than allowable tensile stress.
Further, the width of preset seam takes 3mm~2cm.
Compared with prior art, the beneficial effects of the invention are as follows：By arranging gallery longitudinally preset seam, coagulation high is have adjusted
The regularity of distribution of earth dam roof arch of gallery and base sheet stresses, reduces the scope of exceeded tension, prevent or reduces gallery coagulation
The cracking of soil, improves dam work condition.
Brief description of the drawings
Fig. 1 is flow chart of the invention；
Fig. 2 is the arrangement schematic diagram of gravity dam gallery in the present invention；
Fig. 3 is the arrangement schematic diagram of arch dam gallery in the present invention；
Fig. 4 is Arch Dam Concrete Strength Changes schematic diagram in one embodiment of the invention；
Fig. 5 is arch dam primary stress schematic diagram in one embodiment of the invention；
Fig. 6 is arch dam gallery local stress schematic diagram in one embodiment of the invention；
Fig. 7 is the arch dam exceeded schematic diagram of gallery local stress in one embodiment of the invention；
Fig. 8 is arch dam roof arch of gallery and the bottom preset seam schematic diagram of arch in one embodiment of the invention；
Fig. 9 is that arch dam has gallery edge stress schematic diagram after preset seam in one embodiment of the invention.
Specific embodiment
The present invention is described in detail for shown each implementation method below in conjunction with the accompanying drawings, but it should explanation, these
Implementation method not limitation of the present invention, those of ordinary skill in the art according to these implementation method institutes works energy, method,
Or equivalent transformation or replacement in structure, belong within protection scope of the present invention.
Shown in ginseng Fig. 1 to Fig. 3, Fig. 1 is flow chart of the invention；Fig. 2 is that the arrangement of gravity dam gallery in the present invention is illustrated
Figure, 21 is dam body in Fig. 2, and 22 is gallery；Fig. 3 is the arrangement schematic diagram of arch dam gallery in the present invention, and 31 is dam body, 32 in Fig. 3
It is gallery.
A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack, comprises the following steps：
Step 1, according to dam concrete placement situation, it is determined that allowing tensile strength and allowing tensile strength anaplasia at any time
The process of change.
Step 2, the basic data according to dam is using (linear non-linear) finite element method or Elasticity
The rule that method obtains dam corridor position stress distribution, yield region distribution and stress distribution, yield region distribution is changed over time
Rule；Wherein, the basic data of dam includes：Architectural feature, arrangement of reinforcement situation, casting process, Arch Dam With Joint envelope arch process (weight
Power dam grouting of Longitudinal Joint process etc.), concrete and ambient temperature change procedure, storehouse water water level uphill process and linear expansion coefficient
And elastic modelling quantity parameter.
Step 3, by comparing gallery edge stress with the size for allowing tensile strength or according to yield region size, obtains
Gallery vault and underplate concrete tension are beyond the scope and depth for allowing tensile strength, it is possible to the scope and depth of cracking
Degree.Preset seam length can run through whole monolith, and preset seam width can be in several millimeters~cm range.
Step 4, according to the roof arch of gallery and underplate concrete for obtaining beyond the scope and depth for allowing tensile strength, it is determined that
The position, depth and width of (first one) preset seam.
Step 5, according to determine preset seam position, depth and width, and step 1 determine permission tensile strength and
The process for allowing tensile strength to change over time, lays preset seam, and obtain big using finite element method or Elasticity method
The preset stress distribution after setting that sews cloth in dam gallery position, yield region distribution and stress distribution, yield region distribution are changed over time
Rule (rethink various conditions, change structural model).After joint-cutting, when recalculating stress, unit near the tip of seam
Should encrypt, size of mesh opening should be controlled in 5cm or so, most should very much not exceed 10cm.In result of calculation, being had at the tip of seam should
Power concentration phenomenon, stress can exceed in certain limit allows tensile strength or surrender, be limited to 1 near tip in scope~
When in 2 layer units, the result is entirely stress concentration phenomenon.
Step 6, the relatively more preset gallery edge stress after setting that sews cloth is with the size for allowing tensile strength or according to preset
Sew cloth and set rear gallery yield region size, it is determined whether having more than concrete allows the region of tensile strength, if so, then according to step
The form of 4 pairs of preset seams is adjusted, and increases the depth of preset seam or increases preset seam bar number.If stress is allowing tension strong
Then it is final form with current preset slit formula in the range of degree.
Step 7, repeat step 5,6 are until gallery edge stress is being allowed in the range of tensile strength or without surrender, it is determined that in advance
Put the form of seam.
The method for preventing High Concrete Dam gallery crown and bottom slab crack that the present embodiment is provided, by arranging gallery
The preset seam in longitudinal direction, have adjusted the regularity of distribution of High Concrete Dam roof arch of gallery and base sheet stresses, reduce the model of exceeded tension
Enclose, prevent or reduce the cracking of gallery concrete, improve dam work condition.
In the present embodiment, tensile strength is allowed described in step 1 includes that concrete age morning allows tensile strength and length
Phase allows tensile strength；Wherein, it is the amount of changing with time that concrete age morning allows tensile strength, and age is after 180 days
Tensile strength is allowed with long-term, concrete age morning tensile strength formula is used：
Rt=R0τ/(α+τ)；
Wherein RtIt is early age strength, R0Tensile strength is allowed for long-term, τ is the age in terms of day, and α is coefficient, using mixed
Solidifying soil tensile test data fitting is obtained.In the present embodiment, when the basic data of dam in step 2 changes,
Reacquire dam corridor position stress distribution, yield region distribution and stress distribution, yield region and be distributed the rule for changing over time
Rule.With Dam Designs in Last and the carrying out of work progress, architectural feature, arrangement of reinforcement situation, casting process, Arch Dam With Joint envelope arch process
(gravity dam grouting of Longitudinal Joint process etc.), concrete and ambient temperature change procedure, storehouse water water level uphill process and line are swollen
Coefficient, elastic modelling quantity parameter etc. may produce change, in the case of condition variation is larger, should carry out recalculating analysis.Meter
Calculating can be using block mold, single monolith model or partial model.
In the present embodiment, the correlation computations of concrete yield region use the yield criterion with tensile strength, including two ginsengs
Number criterion, four parameter rules and five parameter rules.
In the present embodiment, in step 4, the position of preset seam is located at the center of yield region, or tension maximum portion
Position；The depth of preset seam is identical with the depth capacity of yield region, or identical with the depth capacity more than allowable tensile stress.
In the present embodiment, the width (joint-cutting thickness) of preset seam takes 3mm~2cm, is determined according to construction in later period situation, applies
The filling of preset seam and the anti-corrosion of reinforcing bar are considered as in work.
Step of the present invention is described in further detail below by instantiation.
Example：Arch dam
Step 1, according to dam concrete placement situation, it is determined that allowing tensile strength and allowing tensile strength anaplasia at any time
Change process, the permission concrete tensile strength change schematic diagram shown in ginseng Fig. 4；
Step 2, architectural feature, arrangement of reinforcement situation, casting process, Arch Dam With Joint the envelope arch process (gravity according to dam
Dam grouting of Longitudinal Joint process etc.), concrete and ambient temperature change procedure, storehouse water water level uphill process and linear expansion coefficient,
Elastic modelling quantity parameter etc., dam corridor position stress point is obtained using linear nonlinear finite element method or Elasticity method
Cloth, yield region distribution and the rule that changes with time.
Arch dam section and gallery position are as shown in figure 3, height of dam 294.5m, maximum bottom width 73.12m.
The a height of 290m of ordinary water level.
Dam primary stress is calculated as shown in figure 5, bottom gallery local stress is as shown in fig. 6, in Fig. 5,1 is
0.1MPa, 2 is 0.5MPa；In Fig. 6,1 is 0.1MPa, and 2 is 0.5MPa, and 3 is 1.0MPa, and 4 is 1.5MPa, and 5 is 2.0MPa.
Step 3, compares gallery edge stress and allows tensile strength relation or according to yield region size, obtain gallery week
Especially vault and underplate concrete tension are more than the scope and depth for allowing tensile strength to side concrete, it is possible to cracking
Scope and depth, as shown in fig. 7, in figure, 71 is the exceeded scope of stress.
Step 4, according to the roof arch of gallery and underplate concrete being calculated beyond the scope and depth for allowing tensile strength,
It is determined that a first preset seam position and depth, preset seam length runs through whole monolith, specific preset seam position and depth such as Fig. 8
Shown, in figure, 81 is the preset seam of crown, and 82 is the preset seam of base plate.
Step 5, according to determination after preset seam position, depth and width, according to the requirement of step 1, rethink various
Condition, changes structural model, and the stress after the preset seam in dam corridor position is obtained using finite element method or structural mechanics method
Be distributed and change with time rule, and such as Fig. 9 is stress situation, only there is the exceeded phenomenon of stress at the tip of preset seam, can
One preset seam is arranged with crown and base plate.
In sum, the present invention by arranging gallery longitudinally preset seam, come by the adjustment gallery periphery local stress regularity of distribution
Improve dam work condition, corridor in dam crown and base plate longitudinal crack are prevented, so as to improve safety of structure.
Those listed above is a series of to be described in detail only for feasibility implementation method of the invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included within the scope of the present invention.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Claims (6)
1. a kind of method for preventing High Concrete Dam gallery crown and bottom slab crack, it is characterised in that comprise the following steps：
Step 1, according to dam concrete placement situation, it is determined that allowing tensile strength and allowing what tensile strength was changed over time
Process；
Step 2, the basic data according to dam obtains dam corridor using finite element method or Elasticity method
The rule that position stress distribution, yield region distribution and stress distribution, yield region distribution are changed over time；Wherein, the dam
The basic data of dam body includes：Architectural feature, arrangement of reinforcement situation, casting process, Arch Dam With Joint envelope arch process, concrete and peripheral ring
Border temperature changing process, storehouse water water level uphill process and linear expansion coefficient and elastic modelling quantity parameter；
Step 3, by comparing gallery edge stress with the size for allowing tensile strength or according to yield region size, obtains gallery
Vault and underplate concrete tension are beyond the scope and depth for allowing tensile strength；
Step 4, according to the roof arch of gallery and underplate concrete for obtaining beyond the scope and depth that allow tensile strength, determines preset
The position of seam, depth and width；Wherein, preset seam length runs through whole monolith；
Step 5, according to determine preset seam position, depth and width, and step 1 determine permission tensile strength and permission
The process that tensile strength is changed over time, lays preset seam, and obtain dam corridor using finite element method or Elasticity method
The rule that the preset stress distribution after setting that sews cloth in road position, yield region distribution and stress distribution, yield region distribution are changed over time
Rule；
Step 6, the relatively more preset gallery edge stress after setting that sews cloth sews cloth with the size for allowing tensile strength or according to preset
If rear gallery yield region size, it is determined whether having more than concrete allows the region of tensile strength, if so, then according to step 4 pair
The form of preset seam is adjusted, and increases the depth of preset seam or increases preset seam bar number；
Step 7, repeat step 5,6 are until gallery edge stress is allowing in the range of tensile strength or without surrender, to determine preset seam
Form.
2. the method for claim 1, it is characterised in that allow the tensile strength to include concrete age morning described in step 1
Phase allows tensile strength and long-term permission tensile strength；Wherein, it is to change with time that concrete age morning allows tensile strength
Amount, age allowed tensile strength after 180 days with long-term, and concrete age morning tensile strength formula is used：
Rt=R0τ/(α+τ)；
Wherein RtIt is early age strength, units MPa, R0Tensile strength is allowed for long-term, units MPa, τ is the age in terms of day, it is single
Position day, α is coefficient.
3. the method for claim 1, it is characterised in that the basic data of the dam described in the step 2 becomes
When dynamic, reacquire dam corridor position stress distribution, yield region distribution and stress distribution, yield region distribution and change over time
Rule.
4. the method for claim 1, it is characterised in that the correlation computations of the concrete yield region are strong using band tension
The yield criterion of degree, including two parameter rules, four parameter rules and five parameter rules.
5. the method for claim 1, it is characterised in that in step 4, the position of the preset seam is located in yield region
Heart position, or tension maximum position；The depth of preset seam is identical with the depth capacity of yield region, or strong with more than tension is allowed
The depth capacity of degree is identical.
6. method as claimed in claim 5, it is characterised in that the width of preset seam takes 3mm~2cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510894882.5A CN105507219B (en) | 2015-12-07 | 2015-12-07 | A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack |
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|---|---|---|---|
| CN201510894882.5A CN105507219B (en) | 2015-12-07 | 2015-12-07 | A kind of method for preventing High Concrete Dam gallery crown and bottom slab crack |
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| CN105507219A CN105507219A (en) | 2016-04-20 |
| CN105507219B true CN105507219B (en) | 2017-06-16 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108536978A (en) * | 2018-04-17 | 2018-09-14 | 中国水利水电科学研究院 | A method of prevent High Concrete Dam gallery crown from cracking |
| CN110147613B (en) * | 2019-05-20 | 2023-03-10 | 华电福新周宁抽水蓄能有限公司 | Pumped storage dam surface temperature and stress analysis method and device and storage medium |
| CN110619169B (en) * | 2019-09-11 | 2023-04-07 | 中国三峡建设管理有限公司 | Method for preventing gallery crown cracking in high concrete dam |
| CN111125955B (en) * | 2019-12-23 | 2021-12-07 | 中国水利水电科学研究院 | Reinforcement method and device for concrete dam in strong earthquake region |
| CN111191313B (en) * | 2019-12-30 | 2023-03-28 | 青建集团股份公司 | Method for measuring constraint coefficients of base plates of rock mass foundation under different boundary conditions |
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| US8272811B2 (en) * | 2009-11-02 | 2012-09-25 | Zhengzhou U-Trust Infrastructure Rehabilitation Ltd. | Process for grouting a curtain with polymer |
| CN202745006U (en) * | 2012-08-07 | 2013-02-20 | 中国水电顾问集团成都勘测设计研究院 | Core wall dam bank slope overlap joint type dam foundation gallery structure |
| CN203821311U (en) * | 2014-04-11 | 2014-09-10 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Water-stop structure for core-wall rock-fill dam inner gallery structural gap |
| CN203866782U (en) * | 2014-04-30 | 2014-10-08 | 中国水电顾问集团华东勘测设计研究院有限公司 | Structure for solving concrete gravity dam bank slope dam block lateral stability |
| CN204266170U (en) * | 2014-12-03 | 2015-04-15 | 中国电建集团成都勘测设计研究院有限公司 | A kind of dam foundation gallery syndeton |
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