A method and apparatus for determining the full-age hydration heat curve of high arch dam concrete.
By inverting the heat of hydration of high arch dams after arch closure and combining it with numerical simulation, the medium- and long-term and full-age heat of hydration curves were calculated, solving the problem of insufficient measurement of the heat of hydration of high arch dam concrete, and improving the accuracy of temperature control and the reliability of engineering analysis.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA THREE GORGES PROJECTS DEV CO LTD
- Filing Date
- 2024-01-11
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies cannot accurately measure the full-age hydration heat curve of high arch dam concrete, resulting in inaccurate temperature control during construction and operation, increasing the risk of cracking and affecting project progress.
By inverting the hydration heat after arch closure using monitoring data from similar high arch dam projects, and combining the birth and death unit technology to establish a three-dimensional transient temperature field numerical simulation, the hydration heat curve after arch closure is determined, and the medium- and long-term and full-age hydration heat curves are calculated based on this.
This improved the accuracy of the hydration heat curve of high arch dam concrete throughout its entire lifespan, ensuring reasonable temperature control design during construction, reducing the risk of cracking, and improving the accuracy of engineering analysis.
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Figure CN117890422B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of data processing technology, and specifically to a method and apparatus for determining the full-age hydration heat curve of high arch dam concrete. Background Technology
[0002] Temperature stress is a significant cause of cracking in large-volume concrete structures during construction and operation, making temperature control a crucial issue in preventing cracking in large-volume concrete. Heat of hydration is a major factor affecting concrete temperature, and obtaining the distribution of heat of hydration throughout the hydration cycle is essential for predicting and regulating the temperature field of dams.
[0003] There are two methods for determining the heat of hydration of concrete: the direct method—directly measuring the adiabatic temperature rise of concrete using an adiabatic temperature rise test device; and the indirect method—first measuring the heat of hydration of cement, and then calculating the adiabatic temperature rise of concrete based on the amount of cement used. The direct method uses a concrete adiabatic temperature rise meter or isothermal calorimeter. Due to experimental limitations, the direct method can only measure the heat of hydration within approximately one month. The indirect method generally measures the heat of hydration of cement using the heat of solution method. This method is highly accurate, but requires precise experimental operation. During the experiment, the absorption of CO2 and moisture by the cement can significantly affect the test results. Theoretically, it can measure the heat of hydration of cement within one year, but generally, after three months, the error of the experimental system becomes non-negligible in the measurement of the heat of hydration. Therefore, determining the heat of hydration of concrete through experiments generally only yields the early-stage heat of hydration.
[0004] For general concrete structures, due to their relatively small thickness, the internal heat of hydration can be quickly conducted to the external environment. The impact of the heat of hydration is mainly in the early stages, with a smaller impact in the medium and long term. Therefore, calculating the heat of hydration curve using adiabatic temperature rise tests is sufficient to meet engineering requirements. However, for large-volume concrete structures like high arch dams, the period of influence of the heat of hydration is much longer than that of general concrete structures (approximately 8–15 years). Studies have shown that the simplified method of estimating the heat of hydration solely through heat of hydration tests is no longer suitable for large-volume concrete structures like arch dams.
[0005] Current methods for determining the hydration heat curve of concrete present two main problems: First, in the later stages of dam construction, inaccurate estimations of the hydration heat lead to insufficient cooling water design, resulting in temperature rebound during construction and increasing the risk of concrete cracking. Second, the simulated dam temperature field during the impoundment and operation period differs significantly from the actual monitored temperature, leading to inaccurate analysis of dam stress, deformation, and other performance characteristics, thus affecting construction and water storage scheduling. Therefore, a method for determining the hydration heat curve of concrete throughout its entire lifespan is needed.
[0006] Existing technology one is based on the design of hydration heat curves according to hydration heat experiments, specifically including:
[0007] Step 1: For different mix proportions and curing conditions, use adiabatic temperature rise test to determine the adiabatic temperature rise process of concrete under the corresponding conditions, or use heat of solution test and isothermal calorimetry to determine the heat of cement hydration, and then deduce the heat of concrete hydration process under the corresponding conditions.
[0008] The second step is to fit the hydration experiment results in a certain way to facilitate subsequent calculations.
[0009] Exponential form: Q(τ)=Q0(1-e -mτ )
[0010] Hyperbolic form:
[0011] Double exponential form:
[0012] The aforementioned prior art has the following disadvantages:
[0013] Disadvantage 1: Short experimental measurement period. Both adiabatic temperature rise and isothermal calorimetry can only measure the heat of hydration within about one month, and the effective age of the thermal dissolution method is only about one age period. Beyond this age period, the experimental error cannot be ignored.
[0014] Disadvantage 2: Using the adiabatic temperature rise process or the heat release process of cement particle hydration as the actual hydration heat process of concrete differs significantly from reality. While this has little impact on general concrete structures, for large-volume concrete, this simplification severely underestimates the later-stage hydration heat, posing potential risks to engineering design.
[0015] Disadvantage 3: It only considers the relationship between heat of hydration and age, but in reality, heat of hydration is also affected by temperature process and maintenance conditions.
[0016] Existing technology two is based on the design of hydration heat curves at equivalent ages, as detailed below:
[0017] Step 1: Determine the adiabatic temperature rise process of concrete under corresponding conditions using an adiabatic temperature rise test, or determine the heat of hydration of cement using a heat of solution test or isothermal calorimetry, and then deduce the adiabatic temperature rise (heat of hydration)-age process of concrete.
[0018] Step 2: Using the equivalent age formula, substitute the concrete adiabatic temperature rise (heat of hydration) - age obtained in Step 1 into the formula to solve for the concrete adiabatic temperature rise - equivalent age curve.
[0019] Step 3: Substitute the design temperature process during actual construction (when cooling water is present) into the equivalent age formula to solve for the equivalent age. Then, based on the adiabatic temperature rise minus the equivalent age from Step 2, the heat of hydration corresponding to the appropriate age can be calculated. If there is no design temperature curve (without active temperature control measures), the solution can be obtained from the initial temperature of the concrete.
[0020] The aforementioned prior art 2 has the following disadvantages:
[0021] Disadvantage 1: The problem of short experimental measurement age has not been solved.
[0022] Disadvantage 2: Although the effect of temperature on the hydration process is taken into account, the equivalent age formula only works well when the age is relatively young (about 3 months), and has little effect beyond this range.
[0023] Disadvantage 3: The problem of insufficient estimation of heat of hydration in the later stage has not been solved or improved, which brings hidden dangers to the engineering design.
[0024] Disadvantage 4: High computational cost, the calculation process requires continuous iteration, and it is a nonlinear problem. Especially when cooling water is involved, the computational overhead is extremely high, and it is rarely used in practical engineering. Summary of the Invention
[0025] To address the problems in the prior art, embodiments of the present invention provide a method and apparatus for determining the full-age hydration heat curve of high arch dam concrete, which can at least partially solve the problems existing in the prior art.
[0026] On the one hand, this invention proposes a method for determining the full-age hydration heat curve of high arch dam concrete, comprising:
[0027] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0028] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0029] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0030] The step of inverting the hydration heat after arch closure based on monitoring data from similar high arch dam projects includes:
[0031] A three-dimensional transient temperature field numerical simulation was established using the birth and death unit technique, and the heat of hydration after arch closure was inverted based on monitoring data of similar high arch dam projects.
[0032] The step of inverting the hydration heat after arch closure based on monitoring data from similar high arch dam projects includes:
[0033] Based on the pre-set initial conditions and the pre-set boundary conditions determined by monitoring data of similar high arch dam projects, the hydration heat inversion after arch sealing is carried out.
[0034] The aforementioned hydration heat inversion after arch sealing includes:
[0035] Determine the proposed range of values for the parameters to be inverted, and use orthogonal experimental design to determine the parameter sample combination;
[0036] Finite element analysis is performed based on the parameter samples, the optimal parameters are determined according to the preset inversion objective function, and the hydration heat curve after arch sealing is determined based on the optimal parameters.
[0037] The preset inversion objective function is represented by the following expression:
[0038]
[0039] Where n is the number of temperature measuring points on the dam body, q i Let T be the monitoring age of the i-th measuring point. it , These are the simulated temperature value and the measured temperature value at the i-th measuring point at day t, respectively.
[0040] The step of determining the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing includes:
[0041] Adjust the parameter values corresponding to the initial medium- and long-term hydration heat curve. When the medium- and long-term hydration heat curve after adjusting the parameter values is the same as the hydration heat curve after sealing the arch in the arch section, the medium- and long-term hydration heat curve with the parameter values assigned at this time is taken as the determined medium- and long-term hydration heat curve.
[0042] The step of determining the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve includes:
[0043] The full-age hydration heat curve of high arch dam concrete is determined based on the early hydration heat curve and its corresponding first empirical parameter, as well as the medium- and long-term hydration heat curve and its corresponding second empirical parameter.
[0044] On one hand, this invention proposes an apparatus for determining the full-age hydration heat curve of high arch dam concrete, comprising:
[0045] The inversion unit is used to invert the heat of hydration after arch sealing based on monitoring data of similar high arch dam projects, and to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0046] The first determining unit is used to determine the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing, and to take the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete.
[0047] The second determining unit is used to determine the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0048] In another aspect, embodiments of the present invention provide an electronic device, including: a processor, a memory, and a bus, wherein,
[0049] The processor and the memory communicate with each other via the bus;
[0050] The memory stores program instructions that can be executed by the processor, and the processor can execute the following methods by calling the program instructions:
[0051] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0052] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0053] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0054] This invention provides a non-transitory computer-readable storage medium, comprising:
[0055] The non-transitory computer-readable storage medium stores computer instructions that cause the computer to perform the following methods:
[0056] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0057] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0058] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0059] The method and apparatus for determining the full-age hydration heat curve of high arch dam concrete provided in this invention inverts the hydration heat after arch closure based on monitoring data of similar high arch dam projects, thus obtaining the hydration heat curve of the high arch dam concrete after arch closure; the medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch closure, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete; the full-age hydration heat curve of the high arch dam concrete is determined based on the medium- and long-term hydration heat curve and the early hydration heat curve, which can solve the problem of insufficient estimation of medium- and long-term hydration heat and improve the accuracy of the full-age hydration heat curve. Attached Figure Description
[0060] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:
[0061] Figure 1 This is a flowchart illustrating a method for determining the full-age hydration heat curve of high arch dam concrete according to an embodiment of the present invention.
[0062] Figure 2 This is a flowchart illustrating a method for determining the full-age hydration heat curve of high arch dam concrete according to another embodiment of the present invention.
[0063] Figure 3 This is a schematic diagram of the medium-to-long-term heat of hydration (full age period) provided in an embodiment of the present invention.
[0064] Figure 4 This is a schematic diagram of early-age hydration heat (1-year-old stage) provided in an embodiment of the present invention.
[0065] Figure 5 This is a schematic diagram of early-age hydration heat, mid-to-long-term hydration heat, and full-age hydration heat provided in the embodiments of the present invention.
[0066] Figure 6 This is a schematic diagram of the device for determining the full-age hydration heat curve of high arch dam concrete according to an embodiment of the present invention.
[0067] Figure 7 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation
[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.
[0069] Figure 1 This is a flowchart illustrating a method for determining the full-age hydration heat curve of high arch dam concrete according to an embodiment of the present invention, as shown below. Figure 1 As shown in the embodiment of the present invention, the method for determining the full-age hydration heat curve of high arch dam concrete includes:
[0070] Step S1: Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing is inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0071] Step S2: Determine the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing, and use the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete.
[0072] Step S3: Determine the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0073] In step S1 above, the device inverts the heat of hydration after arch closure based on monitoring data of similar high arch dam projects, thus obtaining the heat of hydration curve of the high arch dam concrete after arch closure. The device can be a computer device that performs this method. It should be noted that the data acquisition and analysis involved in this embodiment of the invention are authorized by the user. The heat of hydration curve of the high arch dam concrete can be determined first through a heat of hydration test, such as... Figure 2 As shown, the adiabatic temperature rise process of concrete is determined by using an adiabatic temperature rise test, or by using a heat of solution test or isothermal calorimetry to determine the heat of hydration of cementitious materials. Then, based on the amount of cementitious materials used, the adiabatic temperature rise (heat of hydration)-age process of concrete is calculated.
[0074] By fitting the hydration experiment results in a certain form, the hydration heat equation for the early hydration heat age can be obtained. Several common functions are listed below. To facilitate calculation and consider the fitting effect, a combined function form is recommended, generally using two terms.
[0075] Exponential form: Q(τ)=Q0(1-e -mτ )
[0076] Hyperbolic form:
[0077] Double exponential form:
[0078] Combinatorial functions:
[0079] Similar projects refer to one or more similar projects with similar structural dimensions, concrete materials, and climate environments. Monitoring data for similar projects may include air temperature data from the start of pouring, water temperature data at different elevations, dam body temperature monitoring data (including measured internal dam body temperature and dam body surface temperature), and construction process data (including pouring time of each section and time of arch sealing and water cessation).
[0080] The method of inverting the hydration heat after arch closure based on monitoring data of similar high arch dam projects includes:
[0081] A three-dimensional transient temperature field numerical simulation was established using the birth and death unit technique, and the heat of hydration after arch closure was inverted based on monitoring data of similar high arch dam projects.
[0082] The method of inverting the hydration heat after arch closure based on monitoring data of similar high arch dam projects includes:
[0083] Based on the pre-set initial conditions and the pre-set boundary conditions determined by monitoring data of similar high arch dam projects, the hydration heat inversion after arch sealing is carried out.
[0084] The inversion of hydration heat after arch sealing includes:
[0085] Determine the proposed range of values for the parameters to be inverted, and use orthogonal experimental design to determine the parameter sample combination;
[0086] Finite element analysis is performed based on the parameter samples, the optimal parameters are determined according to the preset inversion objective function, and the hydration heat curve after arch sealing is determined based on the optimal parameters.
[0087] The preset inversion objective function is expressed by the following expression:
[0088]
[0089] Where n is the number of temperature measuring points on the dam body, q i Let T be the monitoring age of the i-th measuring point. it , These are the simulated temperature value and the measured temperature value at the i-th measuring point at day t, respectively.
[0090] The explanation is as follows:
[0091] Finite element meshes were created based on the structural shape and geometry. Hexahedral meshes were selected. During mesh generation, the gradual ascent process of the dam's pouring was considered to allow for element grouping and simulation according to actual conditions. To ensure the accuracy of parameter inversion, the element size should be as small as possible, and the ratio of the longest to the shortest side of the element should not exceed 5.
[0092] The surface heat dissipation coefficient of concrete can be derived by inverting the surface temperature of the dam body, or the surface heat dissipation coefficient can be estimated based on the thickness of the insulation material and the ambient wind speed using relevant empirical formulas. The aforementioned relevant empirical formulas can be considered general empirical formulas in this field.
[0093] A three-dimensional transient temperature field numerical simulation was established to invert the heat of hydration after arch sealing. The specific inversion steps are as follows:
[0094] (1) The simulation adopts the dead and live unit technology to kill the active unit in order to realize the dam compartment pouring process. The time to kill the active unit is set according to the actual pouring process.
[0095] (2) Initial conditions setting. The bedrock temperature is set according to the measured initial bedrock temperature, and the initial concrete temperature of each compartment is set according to the actual temperature at which the concrete enters the compartment.
[0096] (3) Boundary condition settings. Boundary condition settings mainly involve three categories, including:
[0097] The first type is a fixed temperature boundary condition, where the dam surface temperature at the elevation below the upstream reservoir water level and the dam body surface temperature at the elevation below the downstream stilling basin water level are set according to water temperature data at different elevations. The dam body surface temperature without a temperature measurement point can be obtained by interpolation.
[0098] The second category is convective boundaries, which are the upstream and downstream surfaces of the dam body in contact with air, as well as the surface of the dam during the pouring process. These boundaries are set according to air temperature data and the inverted surface heat dissipation coefficient.
[0099] The third category is internal heat of hydration, which is divided into two parts: one is the heat of hydration function determined by hydration experiments, expressed as follows:
[0100]
[0101] The other is the heat of hydration after sealing the arch, expressed as follows:
[0102]
[0103] Where, θ res m res Let k be the parameters to be inverted, and τ be the parameters to be inverted. f The arch sealing age can be determined based on the pouring time of each compartment and the time of water cessation for arch sealing. The arch sealing age is the age starting from the time when water cooling is stopped after the arch sealing grouting.
[0104] (4) Inversion process:
[0105] Determine the proposed range of values for the parameters to be inverted, and use orthogonal experimental design to determine the parameter sample combination.
[0106] Finite element analysis is performed based on parameter samples to extract simulated temperature values at monitoring points, and the difference between these simulated and measured temperature values is calculated. The preset inversion objective function is:
[0107]
[0108] Where n is the number of temperature measuring points on the dam body, q i Let T be the monitoring age of the i-th measuring point. it , These are the simulated and measured temperature values for the i-th measuring point at day t, respectively. The optimal parameter sample obtained through inversion is taken as the optimal parameter.
[0109] θ, which will be used as the optimal parameter res m res Substituting k into the above Q res (τ f The expression for ) is used to obtain the hydration heat curve of the concrete in the high arch dam after arch sealing. The corresponding expression is:
[0110]
[0111] Where τ f It is the age of the sealed arch.
[0112] In step S2 above, the device determines the medium-to-long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing, and uses the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete. The step of determining the medium-to-long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing includes:
[0113] Adjust the parameter values corresponding to the initial medium- and long-term hydration heat curve. When the medium- and long-term hydration heat curve after adjusting the parameter values is the same as the hydration heat curve after sealing the arch in the arch section, the medium- and long-term hydration heat curve with the parameter values assigned at this time is taken as the determined medium- and long-term hydration heat curve.
[0114] The temperature control period for high arch dam concrete is generally 9 to 12 months. During the medium to long term of temperature control (3 to 12 months), the complex process of water flow for temperature control, involving continuous adjustments to water temperature, flow rate, and duration, makes it difficult to invert the hydration heat of the concrete during this period using parameter inversion. Therefore, the medium- to long-term hydration heat is estimated from the hydration heat after arch closure. The expression for the medium- to long-term hydration heat is:
[0115]
[0116] By adjusting θ l m l and k l The value of Q is such that its heat of hydration in the arch sealing section is related to the value of Q.res (τ f )same.
[0117] like Figure 3 As shown, the corresponding expression is:
[0118]
[0119] Where τ represents age.
[0120] Before sealing the arch: Water was continuously flowing, so it was impossible to accurately invert the results. Only after sealing the arch and stopping the water flow could the heat of hydration after sealing the arch be inverted.
[0121] Mid-term: From 90 days to 360 days, the heat of hydration during this period, as determined by experiments, is significantly insufficient. Therefore, the heat of hydration during the mid-term is extrapolated from the heat of hydration after arch sealing.
[0122] The heat of hydration curves for the early stages are explained below:
[0123] 28-day adiabatic temperature rise test data for concrete can be obtained. Based on this data, the early-age heat of hydration can be obtained through function fitting, such as... Figure 4 As shown.
[0124] A combined exponential function is used to fit the heat of hydration in early age. The combined function is shown below:
[0125]
[0126] Experience shows that taking the first two terms can fit the sample results well, therefore n is set to 2. Fitting the above results, we finally obtain the expression for the heat of hydration at a given age as a function of age:
[0127]
[0128] Where θ0=25.0, s=0.60, m1=0.252, m2=0.025.
[0129] In step S3 above, the device determines the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0130] The determination of the full-age hydration heat curve of high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve includes:
[0131] The full-age hydration heat curve of high arch dam concrete is determined based on the early hydration heat curve and its corresponding first empirical parameter, as well as the medium- and long-term hydration heat curve and its corresponding second empirical parameter.
[0132] Using the form Q(τ)=aQ1(τ)+bQ2(τ), or other functional forms, a formula for the heat of hydration over the entire lifespan is obtained. Here, 'a' is the first empirical parameter and 'b' is the second empirical parameter, which are related to the concrete properties, temperature process, and structural dimensions. They are generally taken as 0.9 to 1.0, with specific values such as a=1 and b=0.9. The corresponding expression is:
[0133]
[0134] Its corresponding full-age hydration heat curve, early-age hydration heat curve, and mid-to-long-term hydration heat curve, such as Figure 5 As shown.
[0135] The method for determining the full-age hydration heat curve of high arch dam concrete provided in this invention solves the problem that traditional hydration heat curves are only fitted by hydration heat tests, resulting in insufficient estimation of hydration heat in the middle and long-term.
[0136] The significance includes:
[0137] 1. Large concrete structures often require water cooling. Temperature is controlled according to the designed temperature process to control temperature stress and prevent cracking. Traditional hydration heat curves cannot accurately estimate the hydration heat in the middle and long term, leading to unreasonable temperature control design, such as insufficient design cooling capacity, which brings risks.
[0138] 2. The current hydration heat curves, when used for structural safety analysis, show a significant discrepancy between the calculated temperature field and actual monitoring data, leading to unreliable analysis results.
[0139] The method for determining the full-age hydration heat curve of high arch dam concrete provided in this invention involves inverting the hydration heat after arch closure based on monitoring data of similar high arch dam projects to obtain the hydration heat curve of the high arch dam concrete after arch closure; determining the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch closure; and using the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete; and determining the full-age hydration heat curve of the high arch dam concrete based on the medium- and long-term hydration heat curve and the early hydration heat curve. This method can solve the problem of insufficient estimation of medium- and long-term hydration heat and improve the accuracy of the full-age hydration heat curve.
[0140] Furthermore, the step of inverting the hydration heat after arch closure based on monitoring data from similar high arch dam projects includes:
[0141] A three-dimensional transient temperature field numerical simulation was established using the birth and death element technique, and the heat of hydration after arch closure was inverted based on monitoring data from similar high arch dam projects. This can be referred to the above embodiments for further explanation and will not be repeated here.
[0142] Furthermore, the step of inverting the hydration heat after arch closure based on monitoring data from similar high arch dam projects includes:
[0143] Based on the pre-set initial conditions and the pre-set boundary conditions determined from monitoring data of similar high arch dam projects, the hydration heat inversion after arch sealing is performed. This can be referred to the above-described embodiments for further explanation and will not be repeated here.
[0144] Furthermore, the hydration heat inversion after arch sealing includes:
[0145] Determine the proposed range of values for the parameters to be inverted, and use orthogonal experimental design to determine the parameter sample combination; refer to the above embodiments for explanation, and will not be repeated here.
[0146] Finite element analysis is performed based on the parameter samples. Optimal parameters are determined according to a preset inversion objective function, and the hydration heat curve after arch sealing is determined based on the optimal parameters. This can be referred to the above embodiment for further explanation and will not be repeated here.
[0147] Furthermore, the preset inversion objective function is expressed according to the following expression:
[0148]
[0149] Where n is the number of temperature measuring points on the dam body, q i Let T be the monitoring age of the i-th measuring point. it , These represent the simulated temperature and the measured temperature at the i-th measuring point at day t, respectively. Refer to the above embodiment for further details; they will not be repeated here.
[0150] Further, determining the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing includes:
[0151] Adjust the parameter values corresponding to the initial medium-to-long-term hydration heat curve. When the medium-to-long-term hydration heat curve after parameter adjustment is the same as the hydration heat curve after arch sealing in the arch sealing section, the medium-to-long-term hydration heat curve with the assigned parameter values at this time is taken as the determined medium-to-long-term hydration heat curve. Refer to the above embodiment for further details.
[0152] Further, determining the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve includes:
[0153] The full-age hydration heat curve of the high arch dam concrete is determined based on the early hydration heat curve and its corresponding first empirical parameter, and the medium- and long-term hydration heat curve and its corresponding second empirical parameter. This can be referred to the above embodiments for further explanation and will not be repeated here.
[0154] Figure 6 This is a schematic diagram of the device for determining the full-age hydration heat curve of high arch dam concrete according to an embodiment of the present invention, as shown below. Figure 6As shown, the apparatus for determining the full-age hydration heat curve of high arch dam concrete provided in this embodiment of the invention includes an inversion unit 601, a first determining unit 602, and a second determining unit 603, wherein:
[0155] The inversion unit 601 is used to invert the hydration heat after arch closure based on monitoring data of similar high arch dam projects, and obtain the hydration heat curve of the high arch dam concrete after arch closure; the first determination unit 602 is used to determine the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch closure, and uses the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete; the second determination unit 603 is used to determine the full-age hydration heat curve of the high arch dam concrete based on the medium- and long-term hydration heat curve and the early hydration heat curve.
[0156] Specifically, the inversion unit 601 in the device is used to invert the hydration heat after arch closure based on monitoring data of similar high arch dam projects, and obtain the hydration heat curve of the high arch dam concrete after arch closure; the first determination unit 602 is used to determine the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch closure, and uses the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete; the second determination unit 603 is used to determine the full-age hydration heat curve of the high arch dam concrete based on the medium- and long-term hydration heat curve and the early hydration heat curve.
[0157] The apparatus for determining the full-age hydration heat curve of high arch dam concrete provided in this invention inverts the hydration heat after arch closure based on monitoring data of similar high arch dam projects, thus obtaining the hydration heat curve of the high arch dam concrete after arch closure; determines the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch closure, and uses the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete; and determines the full-age hydration heat curve of the high arch dam concrete based on the medium- and long-term hydration heat curve and the early hydration heat curve. This can solve the problem of insufficient estimation of medium- and long-term hydration heat and improve the accuracy of the full-age hydration heat curve.
[0158] The embodiments of the present invention provide an apparatus for determining the full-age hydration heat curve of high arch dam concrete. Specifically, it can be used to execute the processing flow of the above-described method embodiments. Its function will not be repeated here, but can be referred to the detailed description of the above-described method embodiments.
[0159] Figure 7 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as... Figure 7 As shown, the electronic device includes: a processor 701, a memory 702, and a bus 703;
[0160] The processor 701 and the memory 702 communicate with each other via the bus 703.
[0161] The processor 701 is used to call program instructions in the memory 702 to execute the methods provided in the above-described method embodiments, including, for example:
[0162] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0163] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0164] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0165] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer can perform the methods provided in the above-described method embodiments, such as:
[0166] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0167] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0168] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0169] This embodiment provides a computer-readable storage medium storing a computer program that causes the computer to execute the methods provided in the above-described method embodiments, including, for example:
[0170] Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing.
[0171] The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete.
[0172] The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
[0173] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0174] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0175] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0176] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0177] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0178] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for determining the full-age hydration heat curve of high arch dam concrete, characterized in that, include: Based on the monitoring data of similar high arch dam projects, the heat of hydration after arch sealing was inverted to obtain the heat of hydration curve of the high arch dam concrete after arch sealing. The medium- and long-term hydration heat curve of the high arch dam concrete is determined based on the hydration heat curve after arch sealing, and the hydration heat curve of the high arch dam concrete determined by the hydration heat test is used as the early hydration heat curve of the high arch dam concrete. The full-age hydration heat curve of the high arch dam concrete is determined based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
2. The method for determining the full-age hydration heat curve of high arch dam concrete according to claim 1, characterized in that, The method of inverting the hydration heat after arch closure based on monitoring data of similar high arch dam projects includes: A three-dimensional transient temperature field numerical simulation was established using the birth and death unit technique, and the heat of hydration after arch closure was inverted based on monitoring data of similar high arch dam projects.
3. The method for determining the full-age hydration heat curve of high arch dam concrete according to claim 2, characterized in that, The method of inverting the hydration heat after arch closure based on monitoring data of similar high arch dam projects includes: Based on the pre-set initial conditions and the pre-set boundary conditions determined by monitoring data of similar high arch dam projects, the hydration heat inversion after arch sealing is carried out.
4. The method for determining the full-age hydration heat curve of high arch dam concrete according to claim 3, characterized in that, The inversion of hydration heat after arch sealing includes: Determine the proposed range of values for the parameters to be inverted, and use orthogonal experimental design to determine the parameter sample combination; Finite element analysis is performed based on the parameter samples, the optimal parameters are determined according to the preset inversion objective function, and the hydration heat curve after arch sealing is determined based on the optimal parameters.
5. The method for determining the full-age hydration heat curve of high arch dam concrete according to claim 4, characterized in that, The preset inversion objective function is expressed by the following expression: Where n is the number of temperature measuring points on the dam body, q i Let T be the monitoring age of the i-th measuring point. it T it m These are the simulated temperature value and the measured temperature value at the i-th measuring point at day t, respectively.
6. The method for determining the full-age hydration heat curve of high arch dam concrete according to any one of claims 1 to 5, characterized in that, The determination of the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing includes: Adjust the parameter values corresponding to the initial medium- and long-term hydration heat curve. When the medium- and long-term hydration heat curve after adjusting the parameter values is the same as the hydration heat curve after sealing the arch in the arch section, the medium- and long-term hydration heat curve with the parameter values assigned at this time is taken as the determined medium- and long-term hydration heat curve.
7. The method for determining the full-age hydration heat curve of high arch dam concrete according to any one of claims 1 to 5, characterized in that, The determination of the full-age hydration heat curve of high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve includes: The full-age hydration heat curve of high arch dam concrete is determined based on the early hydration heat curve and its corresponding first empirical parameter, as well as the medium- and long-term hydration heat curve and its corresponding second empirical parameter.
8. An apparatus for determining the full-age hydration heat curve of high arch dam concrete, characterized in that, include: The inversion unit is used to invert the heat of hydration after arch sealing based on monitoring data of similar high arch dam projects, and to obtain the heat of hydration curve of the high arch dam concrete after arch sealing. The first determining unit is used to determine the medium- and long-term hydration heat curve of the high arch dam concrete based on the hydration heat curve after arch sealing, and to take the hydration heat curve of the high arch dam concrete determined by the hydration heat test as the early hydration heat curve of the high arch dam concrete. The second determining unit is used to determine the full-age hydration heat curve of the high arch dam concrete based on the medium-to-long-term hydration heat curve and the early-age hydration heat curve.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.