CN110106835A - A kind of analysis method that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking - Google Patents
A kind of analysis method that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
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- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
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Abstract
The invention discloses a kind of analysis methods that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking, it is related to hydraulic engineering technical field, including the following steps successively carried out: establishing the Three-dimensional CAD comprising ground and dam structure, form design conditions, obtain the temperature and stress distributions rule of dam concrete under narrow V-arrangement river valley, the temperature and stress intensity for analyzing dam concrete under different river valley forms obtain influence size and coverage of the river valley form to dam concrete maximum stress.The analysis method is to build a dam to provide safe and scientific Systematic Analysis method in narrow V-arrangement river valley.
Description
Technical field
The present invention relates to hydraulic engineering technical fields, in particular to a kind of narrow V-arrangement river valley to steep slope section coagulation
The analysis method that native temperature controlled anticracking influences.
Background technique
The feature that narrow V-shaped river valley has two sides side slope precipitous, in casting concrete on gradient slope, due to concrete
By the constraint of gradient slope basement rock, biggish temperature stress is generated, the temperature stress on pour and crack prevention are closely related, by
In the analysis for preventing offer systematic science to steep slope section Concrete temperature controlling and crack currently without suitable analysis method
Method.
In consideration of it, the present invention is specifically proposed.
Summary of the invention
The purpose of the present invention is to provide a kind of analyses that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking
Method.The analysis method provides the temperature and Stress calculation formula for calculating domain structure and calculating process, corresponding by establishing
Computation model can analyze narrow V-shaped river valley to the coverage of built dam and influence size, obtains narrow V-shaped river
Paddy is to the degree of restraint and restriction range of dam, and then the dam concrete for analyzing different narrow V-shaped river valleys property is opened
Risk is split, provides important technology reference for the temperature control measures and standard in narrow V-type river valley.
The present invention is implemented as follows:
A kind of analysis method that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking, including what is successively carried out
Following steps: establishing the Three-dimensional CAD comprising ground and dam structure, forms design conditions, obtains under narrow V-arrangement river valley
The temperature and stress distributions rule of dam concrete, it is big to analyze the temperature of dam concrete and stress under different river valley forms
It is small, obtain influence size and coverage of the river valley form to dam concrete maximum stress.
It is applied in preferred embodiment of the invention, the actual characteristic foundation according to narrow V-arrangement river valley is comprising ground and greatly
The Three-dimensional CAD of dam structure；The actual characteristic in narrow V-arrangement river valley includes that river valley cross section is in " V "-shape, V-type river valley two sides
The inclination angle of side slope and the gradient.
In the present invention using in preferred embodiment, it is above-mentioned establish Three-dimensional CAD after, while establishing at least two pairs
Compare model.
In the present invention using in preferred embodiment, above-mentioned formation design conditions include that knot is arranged on Three-dimensional CAD
The material partition of structure and layering is poured, and every layer of the time that pours, placing temperature and water pipe spacing are set.
It is applied in preferred embodiment in the present invention, it is above-mentioned to obtain the temperature of dam concrete under narrow V-arrangement river valley and answer
The power regularity of distribution specifically comprises the following steps: according to Three-dimensional CAD and design conditions, divided using the structure of computational domain and
The division of calculating process, combination temperature field and stress field calculation formula carry out the calculating in temperature field and stress field to threedimensional model,
Finally obtain the temperature and the stress time regularity of distribution and space distribution rule of dam concrete under narrow V-arrangement river valley.
In the present invention using in preferred embodiment, the above-mentioned calculating to temperature field and stress field include to placing temperature with
Temperature stress σ 2 caused by temperature stress σ 1 and hydration heat temperature caused by the difference of equilibrium temperature is overlapped calculating, medium temperature
Degree stress σ 1 is acquired with constraint factor method, is acquired by such as following formula (1), wherein temperature stress σ 2 is acquired by such as following formula (2):
In formula: Kp- the stress relaxation coefficient as caused by concrete creep can use 0.5 when lacking testing data；
R-basic constraint coefficient, as concrete bullet mould EcWith basement rock bullet mould ERWhen close, R can be by 0-0.6 value, when mixed
Solidifying soil plays mould EcWith basement rock bullet mould ERWhen unequal, R can be by table 0.3-0.7 value at foundation plane；
Ec- modulus of elasticity of concrete, MPa；
μ-concrete Poisson's ratio；
α-concrete linear expansion coefficient, 1/ DEG C；
Tp- temperature of concrete during construction, DEG C；
Tf- dam stabilization temperature, DEG C；
Temperature value at T (y)-calculation point of stress y, DEG C；
Ay(ξ)-adds a pair of of single load P=1 at y=ξ, influences coefficient, 0-2 to direct stress caused by point y is calculated
Value；
Temperature of the T (ξ)-at y=ξ, DEG C；
Δ y-coordinate y increment, m；
L-pour long edge size, m.
It is applied in preferred embodiment in the present invention, it is above-mentioned that calculating is overlapped to temperature stress σ 1 and temperature stress σ 2
Formula is acquired by such as following formula (3):
σ=σ1+σ2 (3)。
In the present invention using in preferred embodiment, under the different river valley form of above-mentioned analysis the temperature of dam concrete and
Stress intensity includes analyzing the temperature and stress distributions rule of dam concrete under narrow V-arrangement river valley, to representative section
Temperature and stress envelope diagram analyze and analyze the temperature and stress developing process curve of characteristic portion characteristic point.
It is applied in preferred embodiment in the present invention, further includes the shadow according to river valley form to dam concrete maximum stress
The cracking risk that size analyzes to obtain the Bu Tong dam concrete of narrow V-shaped river valley property with coverage is rung, dam is passed through
The cracking risk of concrete formulates the temperature control measures and standard in narrow V-type river valley.
The invention has the following advantages:
The present invention provides a kind of analysis methods that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking.It should
Analysis method is to build a dam to provide safe and scientific Systematic Analysis method in narrow V-arrangement river valley.The present invention provides computational domains
The temperature and Stress calculation formula of structure and calculating process can analyze narrow V-shaped river by establishing corresponding computation model
Paddy is on the coverage of built dam and influences size, obtains narrow V-shaped river valley to the degree of restraint and restriction range of dam,
And then the cracking risk of the dam concrete of different narrow V-shaped river valleys property is analyzed, it is the temperature control measures in narrow V-type river valley
Important technology reference is provided with standard.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 be three kinds of abrupt slope structural computational model comparison diagrams ((a) model 1, it is precipitous；(b) model 2, generally；(c) model 3,
Gently)；
Fig. 2 be three kinds of abrupt slope structural computational model grid charts ((a) model 1, it is precipitous；(b) model 2, generally；(c) model 3,
Gently)；
Fig. 3 be three kinds of abrupt slope structures pour hierarchical diagram ((a) model 1, it is precipitous；(b) model 2, generally；(c) model 3 are put down
It is slow)；
Fig. 4 be three kinds of steep slope section structure downstream face Yokogawas to stress envelope diagram (unit: 0.01MPa, (a) model 1, suddenly
It is high and steep；(b) model 2, generally；(c) model 3, gentle)；
Fig. 5 be three kinds of steep slope section structure sectional median planes along river to stress envelope diagram (unit: 0.01MPa, (a) model 1,
It is precipitous；(b) model 2, generally；(c) model 3, gentle)；
Fig. 6 is three kinds of steep slope section structure sectional median plane first principal stress stress envelope diagram (units: 0.01MPa, (a) mould
Type 1 is precipitous；(b) model 2, generally；(c) model 3, gentle)；
Fig. 7 is representative point first principal stress charting (elevation 228.0m).
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of narrow V-arrangement river valley, which specifically includes the analysis method that steep slope section Concrete Temperature Control anticracking influences, successively to carry out
Following steps:
(1) Three-dimensional CAD comprising ground and dam structure is established
Narrow V-arrangement river valley is chosen as object is researched and analysed, three kinds of abrupt slope structural shapes is chosen in the present embodiment and is ground
Study carefully, it is shown referring to Figures 1 and 2, tri- kinds of abrupt slope structural computational model comparison diagrams of a, b and c and three kinds of abrupt slope structure meters are established respectively
Calculate model net trrellis diagram.Wherein a is model 1, precipitous type；B is model 2, GENERAL TYPE；C is model 3, high order smooth pattern.Root in the present embodiment
Establish a model according to the inclination angle of V-type river valley two sides side slope, while establishing two contrast models of b and c, contrast model with reality
The river valley form of structure has certain difference, is conducive to compare different computation model superiority and inferiority by the way that contrast model is arranged in this way, from
And obtain optimal computation model.In addition, in other embodiments, contrast model is also possible to any two kinds of groups of a, b and c
It closes.
(2) design conditions are formed
For the superiority and inferiority of the different steep slope section structure type of preferably comparative analysis, three kinds of structural models in the present embodiment
A, b and c computation model take identical calculating operating condition.Setting pours thickness 3m, pours progress referring to shown in table 1.Strong constraint
The area storehouse 1-9, water pipe spacing are 1.5m × 1.5m, other regions storehouse 10-32, water pipe spacing is 2.0m × 2.0m, and phase water flowing is cold
But water temperature be 13 DEG C, cooling time 20d, flow 1.5m3/ h establishes base to the impact analysis of dam for narrow V-type river valley
Plinth.Three kinds of structural model a, b and c computation models pour hierarchical diagram referring to shown in Fig. 3.It, can be in addition, in other embodiments
Setting pours thickness, strong constraint area water pipe spacing according to the actual situation, and cooler-water temperature calculates item at cooling time and flow etc.
Part.
Table 1 pours program
(3) the temperature and stress distributions rule of dam concrete under narrow V-arrangement river valley is obtained
According to the design conditions of the Three-dimensional CAD of step (1) and step (2), divides and count using the structure of computational domain
The division of calculation process, combination temperature field and stress field calculation formula carry out the calculating in temperature field and stress field to threedimensional model, most
The temperature and the stress time regularity of distribution and space distribution rule of dam concrete under narrow V-arrangement river valley are obtained afterwards.
Calculating to temperature field and stress field includes temperature stress σ 1 caused by difference to placing temperature and equilibrium temperature
It is overlapped calculating with temperature stress σ 2 caused by hydration heat temperature, wherein temperature stress σ 1 is acquired with constraint factor method, by such as
Following formula (1) acquires, and wherein temperature stress σ 2 is acquired by such as following formula (2):
In formula: Kp- the stress relaxation coefficient as caused by concrete creep, when lacking testing data, generally desirable 0.5.
For strong constraint area (0-0.2L times of height of dam range, L are the width of dam bottommost), value 0.45 in the present embodiment；Weak constraint
Area's (0.2L-0.4L times of height of dam range) takes 0.55；Press 0.6 value in free zone (> 0.4L times height of dam range).
R-basic constraint coefficient, as concrete bullet mould EcWith basement rock bullet mould ERThe ratio between 0.8-1.25 when, R can be pressed
0-0.6 value, as concrete bullet mould EcWith basement rock bullet mould ERThe ratio between when except 0.8-1.25, R can be by 0.6- at foundation plane
0.7 value；R value 0.5 in the present embodiment
Ec- modulus of elasticity of concrete, MPa；
μ-concrete Poisson's ratio；
α-concrete linear expansion coefficient, 1/ DEG C；
Tp- temperature of concrete during construction, DEG C；
Tf- dam stabilization temperature, DEG C；
Temperature value at T (y)-calculation point of stress y, DEG C；
Ay(ξ)-adds a pair of of single load P=1 at y=ξ, influences coefficient, 0-2 to direct stress caused by point y is calculated
Value, value 1.0 in the present embodiment；
Temperature of the T (ξ)-at y=ξ, DEG C；
Δ y-coordinate y increment, m；
L-pour long edge size, m.
Assume that basic blocks temperature stress is singly to connect domain linear elasticity stress problem in the present embodiment, calculates separately placing temperature
And temperature stress σ 2 caused by temperature stress σ 1 and hydration heat temperature caused by the difference of equilibrium temperature, is then overlapped.It is right
The formula that temperature stress σ 1 and temperature stress σ 2 is overlapped calculating is acquired by such as following formula (3):
σ=σ1+σ2 (3)。
For calculated result referring to shown in Fig. 4-Fig. 7, Fig. 4 is three kinds of steep slope section structure downstream face Yokogawas to stress envelope diagram.
Fig. 5 is three kinds of steep slope section structures along river to stress envelope diagram.Fig. 6 is three kinds of steep slope section structure first principal stress envelope diagrams.
Fig. 7 is stress path line of the representative point when elevation is 228.0m.Three kinds of steep slope section structure maximum stress statistical forms are referring to table 2
It is shown.
2 three kinds of abrupt slope structural stress statistical forms (MPa) of table
(4) temperature and stress intensity of dam concrete under different river valley forms are analyzed
By Fig. 4-Fig. 7 and table 2 it follows that
Maximum first principal stress σ in three kinds of steep slope section structure type concrete1From to small being greatly successively model 1:
2.05MPa, model 2:1.87MP, model 3:1.24MPa.Therefore, narrow V-shaped river valley abrupt slope range relative relief Δ h is bigger,
Its first principal stress and suitable river can all increase to stress, unfavorable to dam concrete temperature controlled anticracking.
It can be obtained according to calculated result, narrow V-shaped river valley abrupt slope range is bigger, and concrete internal stress is bigger, and big stress
Range is also bigger, and so as to cause safety coefficient relative reduction, cracking risk is promoted.
This is because V-shaped river valley abrupt slope range is bigger, and it is also bigger to the degree of restraint and restriction range of dam, it produces
Raw tensile stress is also bigger.Therefore, temperature control measures and standard should be arranged more stringent.
(5) according to the temperature and stress intensity of dam concrete under different river valley forms, obtain river valley form to dam body
The influence size and coverage of concrete maximum stress lay the foundation for the temperature controlled anticracking measure of steep slope section concrete.
The present invention provides a kind of analysis methods that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking.It should
Analysis method is to build a dam to provide safe and scientific Systematic Analysis method in narrow V-arrangement river valley.The present invention provides computational domains
The temperature and Stress calculation formula of structure and calculating process can analyze narrow V-shaped river by establishing corresponding computation model
Paddy is on the coverage of built dam and influences size, obtains narrow V-shaped river valley to the degree of restraint and restriction range of dam,
And then the cracking risk of the dam concrete of different narrow V-shaped river valleys property is analyzed, it is the temperature control measures in narrow V-type river valley
Important technology reference is provided with standard.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of analysis method that narrow V-arrangement river valley influences steep slope section Concrete Temperature Control anticracking, which is characterized in that including according to
The following steps of secondary progress:
The Three-dimensional CAD comprising ground and dam structure is established, design conditions are formed, show that dam is mixed under narrow V-arrangement river valley
Coagulate the temperature and stress distributions rule of soil；
The temperature and stress intensity for analyzing dam concrete under different river valley forms obtain river valley form to dam concrete most
The influence size and coverage of big stress.
2. the analysis method that narrow V-arrangement river valley according to claim 1 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the actual characteristic according to narrow V-arrangement river valley establishes the Three-dimensional CAD comprising ground and dam structure；Institute
The actual characteristic for stating narrow V-arrangement river valley includes that river valley cross section is in " V "-shape, the inclination angle of V-type river valley two sides side slope and the gradient.
3. the analysis method that narrow V-arrangement river valley according to claim 2 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, after establishing the Three-dimensional CAD, while establishing at least two contrast models.
4. the analysis method that narrow V-arrangement river valley according to claim 1 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the formation design conditions include the material partition of setting structure and pouring point on the Three-dimensional CAD
Layer, and every layer of the time that pours, placing temperature and water pipe spacing are set.
5. the analysis method that narrow V-arrangement river valley according to claim 1 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the temperature and stress distributions rule for obtaining dam concrete under narrow V-arrangement river valley specifically comprises the following steps:
According to the Three-dimensional CAD and design conditions, the division with calculating process, combination temperature are divided using the structure of computational domain
Field and stress field calculation formula carry out the calculating in temperature field and stress field to threedimensional model, finally obtain big under narrow V-arrangement river valley
The temperature and the stress time regularity of distribution and space distribution rule of dam concrete.
6. the analysis method that narrow V-arrangement river valley according to claim 5 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the calculating to the temperature field and stress field includes that temperature caused by difference to placing temperature and equilibrium temperature is answered
Temperature stress σ 2 caused by power σ 1 and hydration heat temperature is overlapped calculating, wherein the temperature stress σ 1 is asked with constraint factor method
, it is acquired by such as following formula (1), wherein the temperature stress σ 2 is acquired by such as following formula (2):
In formula: Kp- the stress relaxation coefficient as caused by concrete creep can use 0.5 when lacking testing data；
R-basic constraint coefficient, as concrete bullet mould EcWith basement rock bullet mould ERWhen close, R can work as concrete by 0-0.6 value
Play mould EcWith basement rock bullet mould ERWhen unequal, R can be by 0.3-0.7 value at foundation plane；
Ec- modulus of elasticity of concrete, MPa；
μ-concrete Poisson's ratio；
α-concrete linear expansion coefficient, 1/ DEG C；
Tp- temperature of concrete during construction, DEG C；
Tf- dam stabilization temperature, DEG C；
Temperature value at T (y)-calculation point of stress y, DEG C；
Ay(ξ)-adds a pair of of single load P=1 at y=ξ, influences coefficient, 0-2 value to direct stress caused by point y is calculated；
Temperature of the T (ξ)-at y=ξ, DEG C；
Δ y-coordinate y increment, m；
L-pour long edge size, m.
7. the analysis method that narrow V-arrangement river valley according to claim 6 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the temperature stress σ 1 and the temperature stress σ 2 formula for being overlapped calculating is acquired by such as following formula (3):
σ=σ1+σ2 (3)。
8. the analysis method that narrow V-arrangement river valley according to claim 1 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, the temperature of dam concrete and stress intensity include to narrow V-arrangement river valley under the different river valley form of the analysis
The temperature and stress distributions rule of lower dam concrete is analyzed, to representative section temperature and stress envelope diagram analyzed with
And the temperature and stress developing process curve of characteristic portion characteristic point are analyzed.
9. the analysis method that narrow V-arrangement river valley according to claim 1 influences steep slope section Concrete Temperature Control anticracking,
It is characterized in that, further includes that influence size and coverage according to river valley form to dam concrete maximum stress is analyzed to obtain not
With the cracking risk of the dam concrete of narrow V-shaped river valley property, narrow V-type is formulated by the cracking risk of dam concrete
The temperature control measures and standard in river valley.
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Citations (2)
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| CN102979307A (en) * | 2012-12-12 | 2013-03-20 | 新疆生产建设兵团金来建设工程技术研发有限责任公司 | Temperature-controlled crack prevention construction method for concrete structure |
| CN103603312A (en) * | 2013-10-30 | 2014-02-26 | 中国水利水电科学研究院 | Ideal temperature control curve model of concrete dam and intelligent control method utilizing same |
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