CN109918844B - Calculation method for tunnel cold-proof door temperature field in severe cold region - Google Patents
Calculation method for tunnel cold-proof door temperature field in severe cold region Download PDFInfo
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Abstract
The invention discloses a method for calculating a tunnel cold-proof door temperature field in a severe cold region, which comprises the following steps of: establishing a tunnel mixed gas temperature field calculation model; the method comprises the steps of obtaining the lowest air temperature of the tunnel outside every year, the maximum natural wind speed of the tunnel outside every year, basic parameters of the tunnel and parameters of the train passing through the tunnel, calculating the fortification length of a single-side heat preservation layer of the tunnel, calculating the air quantity in the fortification length of the single-side heat preservation layer of the tunnel, the temperature after air mixing, the opening time of a cold door and the natural wind quantity entering the tunnel in the opening time period of the cold door, calculating the heat quantity of the mixed air inside the tunnel transferred by surrounding rock mass through the ground temperature of the surrounding rock of the tunnel, and converting the heat quantity into the temperature difference of the mixed air inside the tunnel. The method for calculating the temperature field of the tunnel cold-proof door in the severe cold region is a method for calculating the temperature field in the tunnel by using the active heat preservation method of the tunnel cold-proof door in the severe cold region, and is suitable for judging whether the tunnel is suitable for heat preservation by adopting the cold-proof door.
Description
Technical Field
The invention relates to a method for calculating a tunnel cold-proof door temperature field in a severe cold region.
Background
At present, the number of high-speed railway tunnels for constructing cold regions in high-altitude and high-latitude frozen soil regions in China is increased continuously, the problem of freezing injury of the tunnels is serious day by day, and the normal use of the tunnels and the normal operation safety of trains are seriously influenced by accumulated water frost heaving, lining cracking, hole door wall cracking and drainage system freezing. The laying of the heat-insulating layer is a passive cold-proof heat-insulating measure mainly adopted at present, and when the air temperature in the tunnel is lower than minus 40 ℃ and the continuous freezing time exceeds 12 days, the rigid polyvinyl acetate coarse foam with the thickness of 5cm cannot meet the requirements of cold-proof and freezing-resistant performance of the tunnel.
In order to solve the problems, a chinese patent with application number CN201521120171.4 provides a tunnel combined automatic cold-proof door in a high-latitude severe cold region, which comprises a first electric cold-proof door and a second electric cold-proof door, wherein an air inlet pipe and an air outlet pipe are arranged between the two electric cold-proof doors, one end of the air inlet pipe connected with the first electric cold-proof door is connected with an outer tunnel blower, one end of the air inlet pipe connected with the second electric cold-proof door is provided with a louvered check valve i, one end of the air outlet pipe connected with the first electric cold-proof door is provided with a louvered check valve ii, and one end of the air outlet pipe connected with the second electric cold-proof door is provided with a jet fan; the upper parts of the first and second electric cold-proof doors are provided with a left indicating lamp strip and a right indicating lamp strip. However, the feasibility of the active heat preservation method for the cold region tunnel adopting the cold-proof door is not verified by a useful calculation method.
Disclosure of Invention
Aiming at the problem of freezing damage of the tunnel in the cold region in the prior art, the invention provides a calculation method of a tunnel cold-proof door temperature field in the severe cold region, provides a calculation method of a tunnel internal temperature field in the active heat preservation method of the cold-proof door in the severe cold region, is used for judging whether the tunnel is suitable for adopting the cold-proof door for heat preservation, provides a theoretical basis for the tunnel cold-proof door heat preservation method, provides a new method for cold-proof heat preservation design of the railway tunnel in the cold region, and has a certain engineering application value.
In order to achieve the purpose, the technical method adopted by the invention is as follows:
a method for calculating a tunnel cold-proof door temperature field in a severe cold region comprises the following steps:
s1, establishing a tunnel mixed gas temperature field calculation model;
s2, acquiring the lowest temperature of the outside of the tunnel in the year, the maximum natural wind speed of the outside in the year, basic parameters of the tunnel and parameters of the train passing through the tunnel. The train passing tunnel parameters comprise train passing tunnel frequency and train running speed; the basic parameters of the tunnel comprise the ground temperature of surrounding rocks in the tunnel and the total length of the tunnel;
s3, calculating the fortification length of the single-side heat insulation layer of the tunnel according to the lowest annual outside temperature of the tunnel;
s4, calculating the opening time of the cold-proof door and the air volume of natural air entering the tunnel in the opening time period of the cold-proof door according to the basic train operation parameters;
s5, calculating the air quantity in the tunnel and the temperature of the mixed air according to the fortification length of the single-side heat insulation layer of the tunnel;
s6, calculating the heat transferred to the mixed air in the tunnel by the surrounding rock body according to the ground temperature of the surrounding rock, and converting the heat into the increased temperature difference of the mixed air in the tunnel;
s7, calculating the mixing temperature in the tunnel for three months according to the opening frequency of the cold-proof door, wherein if the mixing temperature is greater than zero centigrade, the tunnel can adopt a heat preservation design method of the cold-proof door.
Preferably, in step S2, the method further comprises the following steps:
(1) and acquiring the emergency braking distance and the train length of the train passing through the tunnel, and calculating the shortest opening time of the cold-proof door.
(2) And acquiring the shortest time interval for opening the tunnel cold-proof door.
(3) And acquiring the ground temperature of surrounding rocks in the tunnel and the total length of the tunnel.
Preferably, the fortification length y of the single-side heat-insulating layer of the tunnel is respectively calculated according to the following formula:
y＝-0.5853t 2 -46.183t+207.25
wherein: t is the lowest temperature of the tunnel outside year, unit: DEG C.
Preferably, S2 further comprises: calculating to obtain the opening time T of the cold-proof door:
wherein: x is the train emergency braking distance, unit: m; x is the number of 1 For train length, unit: m; v is train speed, unit: m/s.
Preferably, the amount of air Q entering the tunnel from outside the tunnel is calculated according to the following formula Outer cover ：
Wherein: t is the opening time interval of the cold-proof door, unit: s; h is the average tunnel height, in units: m; omega is the wind speed of natural wind entering the tunnel, and the unit is as follows: m/s; b is the maximum span of the tunnel, unit: and m is selected.
Preferably, the air quantity Q in the tunnel is calculated according to the following formula Inner part ：
Wherein: h is the height of the cold-proof door, unit: m; y is the length of fortifying of tunnel unilateral heat preservation, unit: and m is selected.
Preferably, the temperature t of the mixed gas in the tunnel during the opening time period of the cold-proof door is calculated according to the following formula cm ：
Wherein: q Outer cover For entering into the tunnel from outside the tunnelAn amount of air; q Inner part Is the air quantity in the tunnel; t is t Outer cover Is the tunnel outside temperature, unit: DEG C; t is t Inner part Is the tunnel internal temperature, unit: DEG C.
Preferably, in step S6, the heat Q of the mixed air transferred from the surrounding rock mass to the inside of the tunnel is calculated according to the following formula:
wherein: lambda is the heat conductivity coefficient of surrounding rock, and the unit is: w.m -1 ·℃ -1 ；
Temperature gradient in the normal direction of the isothermal surface, unit: DEG C/m; Δ S is a tiny area on the surrounding rock mass, unit: m is 2 。
Preferably, in step S6, the heat quantity transferred to the mixed air inside the tunnel by the surrounding rock and the tunnel surrounding rock mass is calculated according to the following formula and converted into the increased temperature difference Δ t of the mixed air inside the tunnel:
wherein: q is the mixed air heat, the unit that the tunnel is inside is given to the country rock mass: w; c is the specific heat capacity of the material, in units: kg · ° c; ρ is the density of matter, unit: kg/m 3 (ii) a v is the volume of heat transfer within the tunnel, in units: m is a unit of 3 。
Preferably, the mixed air temperature T inside the tunnel is calculated according to the following formula h ：
T h ＝t cm +Δt
Wherein: t is t cm For the mixed gas temperature in the tunnel in the cold-proof door opening time quantum, the unit: DEG C; delta t is the temperature difference, unit, that the heat quantity transferred to the mixed air inside the tunnel for the surrounding rock mass of the surrounding rock tunnel is converted into the mixed air inside the tunnel to increase: DEG C.
Further, the method is used for judging whether the tunnel is suitable for heat preservation by adopting a cold-proof door.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for calculating a tunnel cold-proof door temperature field in a severe cold region, which comprises the following steps of: establishing a tunnel mixed gas temperature field calculation model; the method comprises the steps of obtaining the lowest air temperature of the tunnel outside every year, the maximum natural wind speed of the tunnel outside every year, basic parameters of the tunnel and parameters of the train passing through the tunnel, calculating the fortification length of a single-side heat preservation layer of the tunnel, calculating the air quantity in the fortification length of the single-side heat preservation layer of the tunnel, the temperature after air mixing, the opening time of a cold door and the natural wind quantity entering the tunnel in the opening time period of the cold door, calculating the heat quantity of the mixed air inside the tunnel transferred by surrounding rock mass through the ground temperature of the surrounding rock of the tunnel, and converting the heat quantity into the temperature difference of the mixed air inside the tunnel. The calculation method of the tunnel cold-proof door temperature field in the severe cold region is a calculation method of the tunnel internal temperature field in the active heat preservation method of the tunnel cold-proof door in the severe cold region, is suitable for judging whether the tunnel is suitable for adopting the cold-proof door for heat preservation, is simple, can judge whether the tunnel in the severe cold region is suitable for adopting the cold-proof door, and has good popularization and application values.
Drawings
FIG. 1 is a flowchart of example 1 of the present invention;
FIG. 2 is a model for calculating the temperature field of the mixed gas in the single-side fortification length of the tunnel according to the invention;
FIG. 3 is a model for calculating the opening time of the cold-proof door according to the present invention;
fig. 4 is a plot of tunnel mixing temperature over 3 months for example 1 of the present invention.
Detailed Description
In order to make the objects, calculation procedures and advantages of the embodiments of the present invention clearer, the procedures in the implementation of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other examples based on the embodiments of the present invention, which are not inventive, are within the scope of the present invention.
As shown in fig. 1 to 4, a method for calculating a temperature field of a cold-proof door of a tunnel in a severe cold region includes the following steps:
s1, establishing a tunnel mixed gas temperature field calculation model;
s2, acquiring the lowest ambient temperature of the tunnel in the external year, the maximum natural wind speed of the tunnel in the external year, basic parameters of the tunnel and parameters of the train passing through the tunnel; the parameters of the train passing through the tunnel comprise the frequency of the train passing through the tunnel and the running speed of the train, and the basic parameters of the tunnel comprise the ground temperature of surrounding rock in the tunnel and the total length of the tunnel;
s3, calculating the fortification length of the single-side heat insulation layer of the tunnel according to the lowest annual outside temperature of the tunnel;
s4, calculating the opening time of the cold-proof door and the air quantity of natural air entering the tunnel within the opening time period of the cold-proof door according to the basic train operation parameters;
s5, calculating the air quantity in the tunnel and the temperature of the mixed air according to the fortification length of the single-side heat insulation layer of the tunnel;
s6, calculating heat transferred to mixed air inside the tunnel by the surrounding rock body according to the ground temperature of the surrounding rock, and converting the heat into a temperature difference increased by the mixed air inside the tunnel;
s7, calculating the mixing temperature in the tunnel for three months according to the opening frequency of the cold-proof door, and if the mixing temperature is higher than zero centigrade, the tunnel can be insulated by adopting the cold-proof door.
The calculation model of the tunnel mixed gas temperature field comprises the mixing of the gas temperature inside and outside the tunnel and the heat conduction of the surrounding rock mass, and the basic parameters of train operation comprise the maximum train design operation speed, the shortest train braking distance and the train length.
In the step S3, the fortification length y of the single-side heat-insulating layer of the tunnel is calculated according to the following formula:
y＝-0.5853t 2 -46.183t+207.25
wherein: t is the lowest temperature of the outside of the tunnel in years, and the unit is as follows: DEG C.
In step S2, the method further includes the steps of:
(1) acquiring the emergency braking distance and the train length of the train passing through the tunnel, and calculating the shortest opening time of the cold-proof door;
(2) acquiring the shortest time interval for opening the tunnel cold-proof door;
(3) and acquiring the ground temperature of surrounding rock in the tunnel.
In step S4, the opening time T of the cold-proof door is calculated according to the following formula:
wherein: x is the train emergency braking distance, unit: m; x is a radical of a fluorine atom 1 For train length, unit: m; v is train speed, unit: m/s.
In step S5, the amount Q of air entering the tunnel from outside the tunnel is calculated according to the following formula Outer cover ：
Wherein: t is the opening time interval of the cold-proof door, unit: s; h is the average tunnel height, in units: m; omega is the wind speed of natural wind entering the tunnel, and the unit is as follows: m/s; b is the maximum span of the tunnel, unit: and m is selected.
In step S5, the air amount Q in the tunnel is calculated according to the following equation Inner part ：
Wherein: h is the average tunnel height, in units: m; y is the length of fortifying of tunnel both ends heat preservation, unit: m; b is the maximum span of the tunnel, unit: and m is selected.
Calculating the temperature t of the mixed gas in the tunnel in the opening time period of the cold-proof door according to the following formula cm ：
Wherein: q Outer cover The air quantity entering the tunnel from the outside of the tunnel is as follows: m is 3 ；Q Inner part Air volume in the tunnel, unit: m is 3 ；t Outer cover Is the tunnel outside temperature, unit: DEG C; t is t Inner part Is the tunnel internal temperature, unit: DEG C.
In step S6, calculating the heat Q of the mixed air transferred to the interior of the tunnel by the surrounding rock mass according to the following formula:
wherein: lambda is the heat conductivity coefficient of surrounding rock, and the unit is: w.m -1 ·℃ -1 ；
Temperature gradient in the normal direction of the isothermal surface, unit: DEG C/m; Δ S is a tiny area on the surrounding rock mass, unit: m is 2 。
In the step S6, the heat quantity transferred to the mixed air in the tunnel by the surrounding rock mass of the surrounding rock tunnel is calculated according to the following formula and converted into the temperature difference delta t increased by the mixed air in the tunnel:
wherein: q is the mixed air heat, the unit that the tunnel is inside is given to the country rock mass: w; c is the specific heat capacity of the material, in units: kg. ° c; ρ is the density of matter, unit: kg/m 3 (ii) a v is the volume of heat transfer within the tunnel, in units: m is a unit of 3 ；
Calculating the temperature T of the mixed air in the tunnel according to the following formula h ：
T h ＝t cm +Δt
Wherein: t is t cm For the mixed gas temperature in the tunnel in the cold-proof door opening time quantum, the unit: DEG C; delta t is heat transferred from surrounding rock mass of surrounding rock tunnel to mixed air in tunnelThe amount is converted into the temperature difference of the mixed air inside the tunnel, and the unit is: DEG C.
Example 1
As shown in fig. 1 to 4, a method for calculating a temperature field of a cold-proof door of a tunnel in a severe cold region includes the following steps:
s1, establishing a tunnel mixed gas temperature field calculation model;
s2, acquiring the lowest temperature of the outside of the tunnel in the year, the maximum natural wind speed of the outside in the year, basic parameters of the tunnel and parameters of the train passing through the tunnel. The train passing tunnel parameters comprise train passing tunnel frequency and train running speed; the basic parameters of the tunnel comprise the ground temperature of surrounding rocks in the tunnel and the total length of the tunnel;
s3, calculating the fortification length of the single-side heat-insulating layer of the tunnel according to the lowest temperature of the outside of the tunnel in the year;
s4, calculating the opening time of the cold-proof door and the air volume of natural air entering the tunnel in the opening time period of the cold-proof door according to the basic train operation parameters, namely the air volume entering the tunnel from the outside of the tunnel;
s5, calculating the air quantity in the tunnel and the temperature of the mixed air according to the fortification length of the single-side heat insulation layer of the tunnel;
s6, calculating the heat transferred to the mixed air in the tunnel by the surrounding rock body according to the ground temperature of the surrounding rock, and converting the heat into the increased temperature difference of the mixed air in the tunnel;
s7, calculating the mixing temperature in the tunnel for three months according to the opening frequency of the cold-proof door, wherein if the mixing temperature is greater than zero centigrade, the tunnel can adopt a heat preservation design method of the cold-proof door.
In step S2, the method further includes:
(1) and acquiring the emergency braking distance and the train length of the train passing through the tunnel, and calculating the shortest opening time of the cold-proof door.
(2) And acquiring the shortest time interval for opening the tunnel cold-proof door.
(3) And acquiring the ground temperature of surrounding rocks in the tunnel and the total length of the tunnel.
In the step S3, the fortification length y of the single-side heat-insulating layer of the tunnel is respectively calculated according to the following formula:
y＝-0.5853t 2 -46.183t+207.25
wherein: t is the lowest temperature of the outside of the tunnel in years, and the unit is as follows: m, note that t uses m as a unit in this formula to calculate the insulating layer fortification length.
As shown in fig. 3, the time T for opening the cold-proof door is calculated according to the emergency braking distance of the train and the length of the train, and the specific formula is as follows:
wherein: x is the train emergency braking distance, unit: m; x is the number of 1 For train length, unit: m; v is train speed, unit: m/s.
The amount of air Q entering the tunnel from outside the tunnel is calculated according to the following formula Outer cover ：
Wherein: t is the opening time interval of the cold-proof door, unit: s; h is the average tunnel height, in units: m; omega is the speed of natural wind entering the tunnel, unit: m/s; b is the maximum span of the tunnel, unit: and m is selected.
The air quantity Q in the tunnel is calculated according to the following formula Inner part ：
Wherein: h is the average tunnel height, in units: m; b is the maximum span of the tunnel, unit: m; y is the length of fortifying of tunnel unilateral heat preservation, unit: m, and only the fortification length of the heat-insulating layer on one side of the tunnel is shown in figure 2.
Calculating the temperature t of the mixed gas in the tunnel in the opening time period of the cold-proof door according to the following formula cm ：
Wherein: q Outer cover The air quantity entering the tunnel from the outside of the tunnel; q Inner part Is the air quantity in the tunnel; t is t Outer cover Is the tunnel outside temperature, unit: DEG C; t is t Inner part Is the tunnel internal temperature, unit: DEG C.
In step S6, calculating the heat Q of the mixed air transferred to the inside of the tunnel by the surrounding rock mass according to the following formula:
wherein: lambda is the heat conductivity coefficient of surrounding rock, and the unit is: w.m -1 ·℃- 1 ；
Is the temperature gradient in the normal direction of the isothermal surface, and the unit: DEG C/m; Δ S is a tiny area on the surrounding rock mass, unit: m is 2 。
In step S6, the heat quantity transferred to the mixed air in the tunnel by the surrounding rock mass of the surrounding rock tunnel is calculated according to the following formula and converted into the increased temperature difference delta t of the mixed air in the tunnel:
wherein: q is the mixed air heat of surrounding rock mass transmission inside the tunnel, unit: w; c is the specific heat capacity of the material, in units: kg. ° c; ρ is the density of matter, unit: kg/m 3 (ii) a v is the volume of heat transfer within the tunnel, in units: m is 3 。
Calculating the temperature T of the mixed air in the tunnel according to the following formula h ：
T h ＝t cm +Δt
Wherein: t is t cm For the mixed gas temperature in the tunnel in the cold-proof door opening time quantum, the unit: DEG C; delta t is that surrounding rock mass of surrounding rock tunnel transmits for tunnel inside air mixtureThe heat is converted into the temperature difference increased by the mixed air in the tunnel, and the unit is as follows: DEG C.
The method is used for judging whether the tunnel is suitable for heat preservation by adopting the cold-proof door.
The extreme low temperature t outside the tunnel is-20 ℃, the ground temperature of surrounding rocks is 5 ℃, the running speed of the train is 300km/h, the length of the train is 205.2m, and the running frequency of the train is 30 min/column by taking a CRH5 type train as an example.
According to the calculation model of the opening time of the cold-proof door in the figure 2, the emergency braking distance of 300km/h and the train length, the opening time T of the cold-proof door is calculated as follows:
wherein: x is the train emergency braking distance, unit: m; x is a radical of a fluorine atom 1 For train length, unit: m; v is train speed, unit: m/s.
Considering the time required by the complete opening of the cold-proof door, the total opening time of the cold-proof door is set to be 60s, and the total air volume of natural air, train air and residual air entering the tunnel is as follows:
when the external extreme temperature of the tunnel is-20 ℃, the fortification length y of the unilateral tunnel is as follows:
y＝-0.5853x 2 -46.183x+207.25＝896.79m
original air quantity Q in tunnel Inner part Comprises the following steps:
opening the cold-proof door for the first time:
air quantity Q outside tunnel Outer cover After entering the tunnel, the air quantity Q is equal to the original air quantity in the tunnel Inner part Mixing at a temperature t cm1 ：
The heat Q that the country rock mass transmitted the inside mixed air in tunnel is:
converting the heat transferred to the mixed air inside the tunnel by the tunnel surrounding rock mass into the temperature difference delta t increased by the mixed air inside the tunnel:
the temperature T of the mixed air in the tunnel after the first cold-proof door is opened 1 Comprises the following steps:
T 1 ＝t cm1 +Δt＝4.919℃
opening the cold-proof door for the second time, the temperature t after mixing cm2 Comprises the following steps:
the temperature T of the mixed air in the tunnel after the first cold-proof door is opened 2 Comprises the following steps:
T 2 ＝t cm2 +Δt＝4.672℃
the above calculation method is repeated, and the air mixing temperature after the cold-proof door is opened each time within three months is calculated, and the calculation result is shown in fig. 4.
If the arrival frequency of the train is 30 min/train and the opening frequency of the cold-proof door is 30 min/time, the cold-proof door is opened 48 times in one day and 4320 times in three months. In an ideal case, the temperature of the mixed air in the tunnel is calculated 4320 times, and the calculation result is 3.38664819117159 ℃ which is a constant value from the 127 th time as shown in fig. 4. The temperature of the mixed air in the tunnel is always the normal temperature, the tunnel can not be frozen, and the tunnel is suitable for heat preservation by adopting an active heat preservation method of a cold-proof door.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for calculating a tunnel cold-proof door temperature field in a severe cold region is characterized by comprising the following steps:
s1, establishing a tunnel mixed gas temperature field calculation model;
s2, acquiring the lowest ambient temperature of the tunnel, the maximum natural wind speed of the tunnel, basic parameters of the tunnel and parameters of the train passing through the tunnel; the parameters of the train passing through the tunnel comprise the frequency of the train passing through the tunnel and the running speed of the train, and the basic parameters of the tunnel comprise the ground temperature of surrounding rock in the tunnel and the total length of the tunnel;
s3, calculating the fortification length of the single-side heat insulation layer of the tunnel according to the lowest annual outside temperature of the tunnel;
s4, calculating the opening time of the cold-proof door and the air volume of natural air entering the tunnel in the opening time period of the cold-proof door according to the basic train operation parameters;
s5, calculating the air quantity in the tunnel and the temperature of the mixed air according to the fortification length of the single-side heat insulation layer of the tunnel;
s6, calculating the heat transferred to the mixed air in the tunnel by the surrounding rock body according to the ground temperature of the surrounding rock, and converting the heat into the increased temperature difference of the mixed air in the tunnel;
s7, calculating the mixing temperature in the tunnel for three months according to the opening frequency of the cold-proof door, and if the mixing temperature is higher than zero centigrade, preserving the heat of the tunnel by using the cold-proof door.
2. The method for calculating the cold-proof door temperature field of the tunnel in the severe cold region as claimed in claim 1, wherein the calculation model of the mixed gas temperature field of the tunnel comprises the temperature mixing of gas inside and outside the tunnel and the heat conduction of the surrounding rock mass, and the basic parameters of train operation comprise the maximum train design operation speed, the minimum train braking distance and the train length.
3. The method for calculating the temperature field of the cold-proof door of the tunnel in the severe cold region as claimed in claim 1, wherein in step S3, the fortification length y of the single-side heat preservation layer of the tunnel is calculated according to the following formula:
y＝-0.5853t 2 -46.183t+207.25
wherein: t is the lowest temperature of the tunnel outside year, unit: DEG C.
4. The method for calculating the temperature field of the cold-proof door of the tunnel in the severe cold region according to claim 1, wherein the step S2 further comprises the following steps:
(1) acquiring the emergency braking distance and the train length of the train passing through the tunnel, and calculating the shortest opening time of the cold-proof door;
(2) acquiring the shortest time interval for opening the tunnel cold-proof door;
(3) and acquiring the ground temperature of surrounding rock in the tunnel.
5. The method for calculating the temperature field of the cold-proof door of the tunnel in the severe cold region according to claim 1, wherein in the step S4, the opening time T of the cold-proof door is calculated according to the following formula:
wherein: x is the train emergency braking distance, unit: m; x is the number of 1 Is the length of the train, unit: m; v is train speed, unit: m/s.
6. The severe cold area tunnel of claim 1The method for calculating the temperature field of the cold-proof door is characterized in that in step S5, the air quantity Q entering the tunnel from the outside of the tunnel is calculated according to the following formula Outer cover ：
Wherein: t is the opening time interval of the cold-proof door, unit: s; h is the average tunnel height, in units: m; omega is the wind speed of natural wind entering the tunnel, and the unit is as follows: m/s; b is the maximum span of the tunnel, unit: and m is selected.
7. The method for calculating the cold-proof door temperature field of the tunnel in the severe cold region as claimed in claim 1, wherein in step S5, the air quantity Q in the tunnel is calculated according to the following formula Inner part ：
Wherein: h is the average tunnel height, in units: m; y is the length of fortifying of tunnel both ends heat preservation, unit: m; b is the maximum span of the tunnel, unit: and m is selected.
8. The method for calculating the cold-proof door temperature field of the tunnel in the severe cold region as claimed in claim 1, wherein the mixed gas temperature t in the tunnel in the opening time period of the cold-proof door is calculated according to the following formula cm ：
Wherein: q Outer cover The air quantity entering the tunnel from the outside of the tunnel is as follows: m is 3 ；Q Inner part Air volume in the tunnel, unit: m is a unit of 3 ；t Outer cover Is the tunnel outside temperature, unit: DEG C; t is t Inner part Is the tunnel internal temperature, unit: DEG C.
9. The method for calculating the cold-proof door temperature field of the tunnel in the severe cold region according to claim 1, wherein in the step S6, the heat quantity Q of the mixed air transferred to the interior of the tunnel by the surrounding rock mass is calculated according to the following formula:
wherein: lambda is the heat conductivity coefficient of surrounding rock, and the unit is: w.m -1 ·℃ -1 ；
Is the temperature gradient in the normal direction of the isothermal surface, and the unit: DEG C/m; Δ S is a tiny area on the surrounding rock mass, unit: m is 2 。
10. The method for calculating the temperature field of the cold-proof door of the tunnel in the severe cold region as claimed in claim 1, wherein in step S6, the heat quantity transferred to the mixed air in the tunnel by the surrounding rock of the surrounding rock tunnel is calculated according to the following formula and converted into the increased temperature difference Δ t of the mixed air in the tunnel:
wherein: q is the mixed air heat, the unit that the tunnel is inside is given to the country rock mass: w; c is the specific heat capacity of the material, in units: kg. ° c; ρ is the density of matter, unit: kg/m 3 (ii) a v is the volume of heat transfer within the tunnel, in units: m is 3 ；
Calculating the temperature T of the mixed air in the tunnel according to the following formula h ：
T h ＝t cm +Δt
Wherein: t is t cm For the mixed gas temperature in the tunnel in the cold-proof door opening time quantum, the unit: DEG C; delta t is the surrounding rock mass of the surrounding rock tunnel and is transmitted to the mixed space in the tunnelThe heat of the air is converted into the increased temperature difference of the mixed air in the tunnel, and the unit is as follows: DEG C.
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| CN106089233A (en) * | 2016-06-12 | 2016-11-09 | 中国矿业大学 | A kind of freeze proof length calculation method of setting up defences of frozen soil tunnel Portal Section |
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Application publication date: 20190621 Assignee: Guangzhou Xiangyu Construction Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2023980049003 Denomination of invention: A Calculation Method for the Temperature Field of Tunnel Cold Protection Doors in Severe Cold Regions Granted publication date: 20230407 License type: Common License Record date: 20231202 |
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