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A rapid prediction method for the cooling temperature field of concrete dams at the initial stage
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A water cooling and concrete dam technology, applied in water conservancy projects, water conservancy engineering equipment, buildings, etc., can solve problems such as unsatisfactory prediction results, failure to consider layer cooling effects, and failure to consider time-space heat conduction issues, etc.
Active Publication Date: 2015-12-30
CHINA THREE GORGES UNIV
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[0029] This prediction formula does not consider the time-space heat conduction problem of the unsteady temperature field in the concrete block, but is obtained by solving it according to the stable temperature field. Obviously, because the formula does not consider the heat dissipation effect of the layer, the prediction effect is not ideal
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Embodiment 1
[0095] Example one (introduction of adjustment items)
[0096] A method for quickly predicting the temperature field of the initial water cooling of a concrete dam, characterized in that the method includes the following steps:
[0097] A) Establish a rapid prediction model for the initial cooling temperature field of a concrete dam with heat source on the outer surface with heat insulation:
[0098] A cooling water pipe is embedded in the concrete pouring silo for water cooling. The equivalent cooling diameter is D, the length is L, there is a heat source, and the initial concrete temperature is T 0 , The inlet water temperature is T w , When the outer surface of the equivalent cooling column is insulated, the average temperature of the concrete can be expressed as
[0099] T(t)=T w +(T 0 -T w )φ(t)+θ 0 Ψ(t)(1)
[0100] among them,
[0101] φ(t)=e -pt (2)
[0102] p=dka / D 2 (3)
[0103] k=2.09-1.35ξ+0.320ξ 2 (4)
[0104] ξ = λL c w ρ w q w - - - ( 5 ...
Embodiment 2
[0169] Embodiment 2 (dynamic update of the measured temperature of the concrete pouring chamber)
[0170] A method for quickly predicting the temperature field of the initial water cooling of a concrete dam, characterized in that the method includes the following steps:
[0171] A) Establish a rapid prediction model for the initial cooling temperature field of a concrete dam with heat source on the outer surface with heat insulation:
[0172] A cooling water pipe is embedded in the concrete pouring silo for water cooling. The equivalent cooling diameter is D, the length is L, there is a heat source, and the initial concrete temperature is T 0 , The inlet water temperature is T w , When the outer surface of the equivalent cooling column is insulated, the average temperature of the concrete can be expressed as
[0173] T(t)=T w +(T 0 -T w )φ(t)+θ 0 Ψ(t)(1)
[0174] among them,
[0175] φ(t)=e -pt (2)
[0176] p=dka / D 2 (3)
[0177] k=2.09-1.35ξ+0.320ξ 2 (4)
[0178] ξ = λL c w ...
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Abstract
The invention discloses a fast forecasting method for an initial water cooling temperature field for a concrete dam. The fast forecasting method for the initial water cooling temperature field for the concrete dam includes steps that A) building a fast forecasting model for the initial water cooling temperature field for the concrete dam with a heat source and an adiabatic outer surface; B) leading in adjustment items to reflect plane heat dissipation influence, and dynamically updating important items of the fast forecasting model for the initial water cooling temperature field for the concrete dam based on the actual temperature of a concrete pouring storehouse so as to eliminate errors caused by uncertain factors and build the fast forecasting model for the temperature of the pouring storehouse in the initial cooling period of the concrete dam which takes outside temperature into account. According to the fast forecasting method for the initial water cooling temperature field for the concrete dam, adjustment items are led into the fast forecasting model for the initial water filling for the concrete dam so as to reflect the plane heat dissipation influence, and important items of a water pipe cooling temperature forecasting model are updated dynamically based on the current actual temperature of the pouring storehouse so as to build the fast and precise concrete dam temperature forecasting model with small calculation workload.
Description
Technical field [0001] The invention relates to a method for predicting the temperature field, in particular to a method for quickly predicting the temperature field of the initial water cooling of a concrete dam. Background technique [0002] Water pipe cooling is an important technical measure for temperature control and crack prevention in concrete dam construction, and it has been widely used at home and abroad. Water cooling of dam concrete is generally divided into initial stage, middle stage, and late stage. The initial stage is the first stage of water cooling. Its function is mainly to reduce the peak peak temperature of early concrete. Cooling water is generally used in high temperature seasons, and low temperature river water can be used in other seasons. In order to promptly guide the temperature control personnel at the dam construction site to implement the water supply measures, it is necessary to calculate the cooling effect of the water pipes, especially the calc...
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