CN109918844A - A kind of calculation method in tunnel in cold regions winter protection door temperature field - Google Patents
A kind of calculation method in tunnel in cold regions winter protection door temperature field Download PDFInfo
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Abstract
The invention discloses a kind of calculation methods in tunnel in cold regions winter protection door temperature field, comprising the following steps: establishes tunnel mixed gas temperature field computation model；Obtain the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel basic parameter and train process of passing through tunnel parameter, calculate the length of setting up defences of tunnel unilateral side insulating layer, it calculates tunneling insulating layer and sets up defences and air capacity in length and the mixed temperature of air and enter the natural wind air quantity in tunnel in winter protection door opening time and the period, country rock body is calculated by tunnel surrounding ground temperature and passes to the heat of tunnel internal mixing air and is scaled the increased temperature difference of tunnel internal mixing air.The calculation method in tunnel in cold regions winter protection door provided by the invention temperature field is the calculation method in temperature field in hole under severe cold area winter protection door active heat preserving method, suitable for judging that tunnel is kept the temperature if appropriate for using winter protection door.
Description
Technical field
The present invention relates to a kind of calculation methods in tunnel in cold regions winter protection door temperature field.
Background technique
It is continuously increased currently, building cold area's Railway Tunnel quantity in China's High aititude, high latitude Frozen Ground Area, tunnel
Freeze injury problem be on the rise, ponding frost heave, Lining cracks, portal wall cracking, drainage system freeze to seriously affect tunnel normal
Using and train normal operation safety.Being laid with insulating layer is the passive cold-proof heat insulation measure mainly used at present, in hole outer gas
When temperature is lower than -40 DEG C, when lasting freeze-off time is more than 12 days, the thick foam of hard poly-vinegar of 5cm thickness is unable to satisfy the cold-proof jelly in tunnel
Anti- requirement.
In view of the above-mentioned problems, application No. is the Chinese patents of CN201521120171.4 with proposing a kind of high latitude severe cold
Area tunnel combines automatic winter protection door, including first of electronic winter protection door and the electronic winter protection door of second, the electronic winter protection door of twice it
Between be equipped with blast pipe and air-exhausting duct, one end that blast pipe is connect with first of electronic winter protection door connect with air blower outside tunnel, into
One end that air hose is connect with the electronic winter protection door of second is equipped with louvered non-return valve I, air-exhausting duct and first of electronic winter protection door
One end of connection is equipped with louvered non-return valve II, and one end that air-exhausting duct is connect with the electronic winter protection door of second is equipped with jet stream wind
Machine；First and second electronic winter protection door top is equipped with left side instruction light bar and right side instruction light bar.But it is directed to and uses winter protection door
Tunnel in cold area active heat preserving method there has been no to calculation method verify its feasibility.
Summary of the invention
For the freeze injury problem of tunnel in cold area existing in the prior art, it is anti-that the present invention provides a kind of tunnel in cold regions
The calculation method in poor and humble family temperature field provides a kind of calculating side in temperature field in hole under severe cold area winter protection door active heat preserving method
Method provides theoretical foundation for tunnel winter protection door heat preserving method, is Han Qu for judging that tunnel is kept the temperature if appropriate for using winter protection door
The design of railway tunnel cold-proof heat insulation provides new method, has certain engineering application value.
In order to achieve the above object, the technology used in the present invention method is as follows:
A kind of calculation method in tunnel in cold regions winter protection door temperature field, comprising the following steps:
S1, tunnel mixed gas temperature field computation model is established；
S2, the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel basic parameter and train process are obtained
Parameters for tunnel.The train process of passing through tunnel parameter includes that train passes through tunnel frequency, train operation speed per hour；Substantially join in the tunnel
Count including country rock in tunnel mild tunnel overall length；
S3, the length of setting up defences that tunnel unilateral side insulating layer is calculated according to the extraneous year lowest temperature in tunnel；
S4, according in train operation Parameter Calculation winter protection door opening time and the period enter tunnel in nature
The air quantity of wind；
S5, the air capacity and the mixed temperature of air set up defences in length computation tunnel according to tunneling insulating layer；
S6, country rock body is calculated according to country rock ground temperature pass to the heat of tunnel internal mixing air and be scaled in tunnel
The increased temperature difference of portion's mixing air；
S7, mixing temperature calculating in the tunnel of three months durations is carried out according to winter protection door open frequency, if mixing temperature is equal
Greater than zero degrees celsius, then the INSULATION DESIGN method of winter protection door can be used in the tunnel.
Preferably, further comprise following steps in step S2:
1. emergency stopping distance and the train length of the train by tunnel are obtained, when calculating winter protection door most short unlatching
Between.
2. obtaining the shortest time interval that tunnel winter protection door is opened.
3. obtaining country rock ground temperature temperature and tunnel total length in tunnel.
Preferably, it calculates separately to obtain tunnel unilateral side insulating layer according to the following formula to set up defences length y:
Y=-0.5853t2-46.183t+207.25
Wherein: t is the extraneous year lowest temperature in tunnel, unit: DEG C.
Preferably, S2 further comprises: the time T of winter protection door unlatching is calculated:
Wherein: x is train emergency stopping distance, unit: m；x1For train length, unit: m；V is train speed, unit:
m/s。
Preferably, the air capacity Q by entering in tunnel outside tunnel is calculated according to the following formulaOutside:
Wherein: t is winter protection door opening time interval, unit: s；H be tunnel average height, unit:
m；ω is into natural wind wind speed in tunnel, unit: m/s；B is tunnel largest span, unit: m.
Preferably, the air capacity Q in tunnel is calculated according to the following formulaIt is interior:
Wherein: H is winter protection door height, unit: m；Y is that tunnel unilateral side insulating layer is set up defences length, unit: m；B be tunnel most
Long span, unit: m.
Preferably, the mixed gas temperature in winter protection door opening time section inner tunnel is calculated according to the following formula
tcm:
Wherein: QOutsideFor the air capacity entered in tunnel outside tunnel；QIt is interiorFor the air capacity in tunnel；tOutsideFor the extraneous temperature in tunnel
Degree, unit: DEG C；tIt is interiorFor tunnel internal temperature, unit: DEG C.
Preferably, in step S6, the mixing air heat Q that country rock body passes to tunnel internal is calculated according to the following formula:
Wherein: λ is country rock thermal coefficient, unit are as follows: Wm-1·℃-1；For the temperature gradient of isothermal level normal direction,
Unit: DEG C/m；△ S is a small area on country rock body, unit: m2。
Preferably, in step S6, surrounding rock tunnel country rock body is calculated according to the following formula and passes to tunnel internal mixing air
Heat be scaled the increased temperature difference △ t of tunnel internal mixing air:
Wherein: Q is the mixing air heat that country rock body passes to tunnel internal, unit: w；C is the specific heat capacity of substance, single
Position: kg. DEG C；ρ is material density, unit: kg/m3；V is the volume of heat transmitting in tunnel, unit: m3。
Preferably, the mixing air temperature T of tunnel internal is calculated according to the following formulah:
Th=tcm+Δt
Wherein: tcmFor the winter protection door opening time section inner tunnel in mixed gas temperature, unit: DEG C；△ t is surrounding rock tunnel
The heat that country rock body passes to tunnel internal mixing air is scaled the increased temperature difference of tunnel internal mixing air, unit: DEG C.
Further, method of the invention is for judging that tunnel is kept the temperature if appropriate for using winter protection door.
Compared with prior art, the invention has the benefit that
The invention discloses a kind of calculation methods in tunnel in cold regions winter protection door temperature field, comprising the following steps: establishes
Tunnel mixed gas temperature field computation model；Obtain the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel base
This parameter and train process of passing through tunnel parameter calculate the length of setting up defences of tunnel two sides insulating layer, calculate tunneling insulating layer and set up defences length
Enter the natural wind wind in tunnel in the interior mixed temperature of air capacity and air and winter protection door opening time and the period
Amount, calculates that country rock body passes to the heat of tunnel internal mixing air and to be scaled tunnel internal mixed by tunnel surrounding ground temperature
Close the increased temperature difference of air.The calculation method in tunnel in cold regions winter protection door provided by the invention temperature field is severe cold area
Under winter protection door active heat preserving method in hole temperature field calculation method, be suitable for judge tunnel if appropriate for using winter protection door progress
Heat preservation, calculation method is simple, can judge tunnel in cold area if appropriate for using winter protection door, has good application value.
Detailed description of the invention
Fig. 1 is the flow chart of the embodiment of the present invention 1；
Fig. 2 is that tunnel unilateral side of the invention is set up defences mixed gas temperature field computation model in length；
Fig. 3 is winter protection door opening time computation model of the invention；
Fig. 4 is 3 months inner tunnel mixing temperature scattergrams of the embodiment of the present invention 1.
Specific embodiment
It is right below in conjunction with attached drawing and example to keep purpose, calculation process and the advantage of the embodiment of the present invention clearer
Process in present invention implementation is clearly and completely described, it is clear that described embodiment is that a part of the invention is implemented
Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness
Under the premise of every other example, shall fall within the protection scope of the present invention.
As shown in Figs 1-4, the calculation method in a kind of tunnel in cold regions winter protection door temperature field, comprising the following steps:
S1, tunnel mixed gas temperature field computation model is established；
S2, the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel basic parameter and train process are obtained
Parameters for tunnel；The train process of passing through tunnel parameter includes train by tunnel frequency and train operation speed per hour, and the tunnel is basic
Parameter includes the mild tunnel overall length in country rock ground in tunnel；
S3, the length of setting up defences that tunnel unilateral side insulating layer is calculated according to the extraneous year lowest temperature in tunnel；
S4, according in train operation Parameter Calculation winter protection door opening time and the period enter tunnel in nature
The air quantity of wind；
S5, the air capacity set up defences in length computation tunnel and the mixed temperature of air according to tunneling insulating layer；
S6, country rock body is calculated according to country rock ground temperature pass to the heat of tunnel internal mixing air and be scaled in tunnel
The increased temperature difference of portion's mixing air；
S7, mixing temperature calculating in the tunnel of three months durations is carried out according to winter protection door open frequency, if mixing temperature is equal
Greater than zero degrees celsius, then the tunnel can be used winter protection door and be kept the temperature.
The tunnel mixed gas temperature field computation model includes the heat transfer of gas temperature mixing and country rock body inside and outside hole,
The train operation basic parameter includes train design maximum operational speed, the most short braking distance of train and train length.
In step S3, tunnel unilateral side insulating layer is calculated according to the following formula and sets up defences length y:
Y=-0.5853t2-46.183t+207.25
Wherein: t is the extraneous year lowest temperature in tunnel, unit: DEG C.
In step S2, further include steps of
1. emergency stopping distance and the train length of the train by tunnel are obtained, when calculating winter protection door most short unlatching
Between；
2. obtaining the shortest time interval that tunnel winter protection door is opened；
3. obtaining country rock ground temperature temperature in tunnel.
In step S4, winter protection door opening time T is calculated according to the following formula:
Wherein: x is train emergency stopping distance, unit: m；x1For train length, unit: m；V is train speed, unit:
m/s。
In step S5, the air capacity Q by entering in tunnel outside tunnel is calculated according to the following formulaOutside:
Wherein: t is winter protection door opening time interval, unit: s；H is tunnel average height, unit: m；ω is into tunnel
Interior natural wind wind speed, unit: m/s；B is tunnel largest span, unit: m.B is tunnel largest span, unit: m.
In step S5, the air capacity Q in tunnel is calculated according to the following formulaIt is interior:
Wherein: H is tunnel average height, unit: m；Y is that tunnel both ends insulating layer is set up defences length, unit: m；B is tunnel
Largest span, unit: m.
The mixed gas temperature t in winter protection door opening time section inner tunnel is calculated according to the following formulacm:
Wherein: QOutsideFor the air capacity entered in tunnel outside tunnel, unit: m3；QInside it isFor the air capacity in tunnel, unit: m3；
tOutsideFor tunnel ambient temperature, unit: DEG C；tIt is interiorFor tunnel internal temperature, unit: DEG C.
In step S6, the mixing air heat Q that country rock body passes to tunnel internal is calculated according to the following formula:
Wherein: λ is country rock thermal coefficient, unit are as follows: Wm-1·℃-1；For the temperature gradient of isothermal level normal direction,
Unit: DEG C/m；△ S is a small area on country rock body, unit: m2。
In step S6, the heat that calculating surrounding rock tunnel country rock body passes to tunnel internal mixing air according to the following formula is changed
Calculate is the increased temperature difference △ t of tunnel internal mixing air:
Wherein: Q is the mixing air heat that country rock body passes to tunnel internal, unit: w；C is the specific heat capacity of substance, single
Position: kg. DEG C；ρ is material density, unit: kg/m3；V is the volume of heat transmitting in tunnel, unit: m3。
The mixing air temperature T of tunnel internal is calculated according to the following formulah:
Th=tcm+Δt
Wherein: tcmFor the winter protection door opening time section inner tunnel in mixed gas temperature, unit: DEG C；△ t is surrounding rock tunnel
The heat that country rock body passes to tunnel internal mixing air is scaled the increased temperature difference of tunnel internal mixing air, unit: DEG C.
Embodiment 1
As shown in Figs 1-4, the calculation method in a kind of tunnel in cold regions winter protection door temperature field, comprising the following steps:
S1, tunnel mixed gas temperature field computation model is established；
S2, the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel basic parameter and train process are obtained
Parameters for tunnel.The train process of passing through tunnel parameter includes that train passes through tunnel frequency, train operation speed per hour；Substantially join in the tunnel
Count including country rock in tunnel mild tunnel overall length；
S3, the length of setting up defences that tunnel unilateral side insulating layer is calculated according to the extraneous year lowest temperature in tunnel；
S4, according in train operation Parameter Calculation winter protection door opening time and the period enter tunnel in nature
The air quantity of wind, the i.e. air capacity by entering in tunnel outside tunnel；
S5, the air capacity and the mixed temperature of air set up defences in length computation tunnel according to tunneling insulating layer；
S6, country rock body is calculated according to country rock ground temperature pass to the heat of tunnel internal mixing air and be scaled in tunnel
The increased temperature difference of portion's mixing air；
S7, mixing temperature calculating in the tunnel of three months durations is carried out according to winter protection door open frequency, if mixing temperature is equal
Greater than zero degrees celsius, then the INSULATION DESIGN method of winter protection door can be used in the tunnel.
In step S2, further comprise:
1. emergency stopping distance and the train length of the train by tunnel are obtained, when calculating winter protection door most short unlatching
Between.
2. obtaining the shortest time interval that tunnel winter protection door is opened.
3. obtaining country rock ground temperature temperature and tunnel total length in tunnel.
In step S3, calculates separately to obtain tunnel unilateral side insulating layer according to the following formula and sets up defences length y:
Y=-0.5853t2-46.183t+207.25
Wherein: t is the extraneous year lowest temperature in tunnel, unit: m, it is noted that t in this formula using m as unit,
Insulating layer is calculated to set up defences length.
As shown in figure 3, obtaining the time of winter protection door unlatching according to train emergency stopping distance and train itself length computation
T, specific formula are as follows:
Wherein: x is train emergency stopping distance, unit: m；x1For train length, unit: m；V is train speed, unit:
m/s。
The air capacity Q by entering in tunnel outside tunnel is calculated according to the following formulaOutside:
Wherein: t is winter protection door opening time interval, unit: s；H is tunnel average height, unit: m；ω is into tunnel
Interior natural wind wind speed, unit: m/s；B is tunnel largest span, unit: m.
The air capacity Q in tunnel is calculated according to the following formulaIt is interior:
Wherein: H is tunnel average height, unit: m；B is tunnel largest span, unit: m；Y is tunnel unilateral side insulating layer
It sets up defences length, unit: a display tunnel side insulating layer is set up defences length in m, Fig. 2.
The mixed gas temperature t in winter protection door opening time section inner tunnel is calculated according to the following formulacm:
Wherein: QOutsideFor the air capacity entered in tunnel outside tunnel；QIt is interiorFor the air capacity in tunnel；tOutsideFor the extraneous temperature in tunnel
Degree, unit: DEG C；tIt is interiorFor tunnel internal temperature, unit: DEG C.
In step S6, the mixing air heat Q that country rock body passes to tunnel internal is calculated according to the following formula:
Wherein: λ is country rock thermal coefficient, unit are as follows: Wm-1·℃-1；For the temperature gradient of isothermal level normal direction,
Unit: DEG C/m；△ S is a small area on country rock body, unit: m2。
In step S6, the heat that calculating surrounding rock tunnel country rock body passes to tunnel internal mixing air according to the following formula is changed
Calculate is the increased temperature difference △ t of tunnel internal mixing air:
Wherein: Q is the mixing air heat that country rock body passes to tunnel internal, unit: w；C is the specific heat capacity of substance, single
Position: kg. DEG C；ρ is material density, unit: kg/m3；V is the volume of heat transmitting in tunnel, unit: m3。
The mixing air temperature T of tunnel internal is calculated according to the following formulah:
Th=tcm+Δt
Wherein: tcmFor the winter protection door opening time section inner tunnel in mixed gas temperature, unit: DEG C；△ t is surrounding rock tunnel
The heat that country rock body passes to tunnel internal mixing air is scaled the increased temperature difference of tunnel internal mixing air, unit: DEG C.
The present invention is for judging that tunnel is kept the temperature if appropriate for using winter protection door.
With tunnel external world extreme low temperature temperature t for -20 DEG C, country rock ground temperature temperature is 5 DEG C, and train operation speed per hour is 300km/
H, train length 205.2m, by taking CRH5 type train as an example, train operation frequency 30min/ is classified as example.Table 1 be it is of the invention not
With train speed per hour emergency stopping distance table.
The emergency stopping distance of 300km/h and train length's meter in winter protection door opening time computation model and table 1 according to fig. 2
Calculate the opening time T of winter protection door are as follows:
Wherein: x is train emergency stopping distance, unit: m；x1For train length, unit: m；V is train speed, unit:
m/s。
The time required to fully opening in view of winter protection door, winter protection door unlatching is set to 60s at total time, into tunnel internal
Natural wind, train parting, lingering remnants of past customs total blast volume are as follows:
When tunnel external world extreme temperature is -20 DEG C, the length y that sets up defences in unilateral tunnel are as follows:
Y=-0.5853x2-46.183x+207.25
=896.79m
The original air capacity Q of tunnel internalIt is interiorAre as follows:
First switch on winter protection door:
Air capacity Q outside tunnelOutsideInto after tunnel, with air capacity Q original in tunnelIt is interiorIt is mixed, mixed temperature
For tcm1:
Country rock body passes to the heat Q of tunnel internal mixing air are as follows:
The heat that tunnel surrounding body passes to tunnel internal mixing air is scaled the increased temperature of tunnel internal mixing air
Spend poor Δ t:
Tunnel internal mixing air temperature T after then first time winter protection door is opened1Are as follows:
T1=tcm1+Δt
=4.919 DEG C
Second of opening winter protection door, mixed temperature tcm2Are as follows:
Tunnel internal mixing air temperature T after then first time winter protection door is opened2Are as follows:
T2=tcm2+Δt
=4.672 DEG C
Above-mentioned calculation method is repeated, the air mixing temperature after winter protection door is opened every time in three months, calculated result are calculated
As shown in Figure 4.
It is 30min/ column with train arrival rate, winter protection door open frequency is also just 30min/ times, then cold-proof in one day
Door is opened winter protection door in 48 times, three months and is opened altogether 4320 times.In the ideal case, to mixing air temperature computation in tunnel
4320 times, for calculated result as shown in figure 4, the abscissa in Fig. 4 is mixing air temperature computation number in tunnel, ordinate is temperature
Angle value is 3.38664819117159 DEG C of definite value since the 127th mixing air temperature.Tunnel internal mixing air temperature begins
Be positive temperature eventually, and freeze injury will not occur for tunnel, then the tunnel is suitble to keep the temperature it using the active heat preserving method of winter protection door.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to previous embodiment
Documented technical solution is modified, or equivalent substitution of some or all of the technical features；And these are repaired
Change or replaces, technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of calculation method in tunnel in cold regions winter protection door temperature field, which comprises the following steps:
S1, tunnel mixed gas temperature field computation model is established；
S2, the extraneous year lowest temperature in tunnel, extraneous year maximum natural wind wind speed, tunnel basic parameter and train process of passing through tunnel are obtained
Parameter；The train process of passing through tunnel parameter includes that train passes through tunnel frequency and train operation speed per hour, the tunnel basic parameter
Including country rock in tunnel mild tunnel overall length；
S3, the length of setting up defences that tunnel unilateral side insulating layer is calculated according to the extraneous year lowest temperature in tunnel；
S4, according to the natural wind entered in train operation Parameter Calculation winter protection door opening time and the period in tunnel
Air quantity；
S5, the air capacity set up defences in length computation tunnel and the mixed temperature of air according to tunneling insulating layer；
S6, calculate that country rock body passes to the heat of tunnel internal mixing air and to be scaled tunnel internal mixed according to country rock ground temperature
Close the increased temperature difference of air；
S7, mixing temperature calculating in the tunnel of three months durations is carried out according to winter protection door open frequency, if mixing temperature is all larger than
Zero degrees celsius, then the tunnel can be used winter protection door and be kept the temperature.
2. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that institute
Stating tunnel mixed gas temperature field computation model includes the heat transfer of gas temperature mixing and country rock body inside and outside hole, the train fortune
Row basic parameter includes train design maximum operational speed, the most short braking distance of train and train length.
3. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S3, tunnel unilateral side insulating layer is calculated according to the following formula and sets up defences length y:
Y=-0.5853t2-46.183t+207.25
Wherein: t is the extraneous year lowest temperature in tunnel, unit: DEG C.
4. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S2, further include steps of
1. obtaining emergency stopping distance and the train length of the train by tunnel, the winter protection door most short opening time is calculated；
2. obtaining the shortest time interval that tunnel winter protection door is opened；
3. obtaining country rock ground temperature temperature in tunnel.
5. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S4, winter protection door opening time T is calculated according to the following formula:
Wherein: x is train emergency stopping distance, unit: m；x1For train length, unit: m；V is train speed, unit: m/s.
6. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S5, the air capacity Q by entering in tunnel outside tunnel is calculated according to the following formulaOutside:
Wherein: t is winter protection door opening time interval, unit: s；H is tunnel average height, unit: m；ω be into tunnel from
Right wind wind speed, unit: m/s；B is tunnel largest span, unit: m.B is tunnel largest span, unit: m.
7. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S5, the air capacity Q in tunnel is calculated according to the following formulaIt is interior:
Wherein: H is tunnel average height, unit: m；Y is that tunnel both ends insulating layer is set up defences length, unit: m；B is that tunnel is maximum
Across footpath, unit: m.
8. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that root
The mixed gas temperature t in winter protection door opening time section inner tunnel is calculated according to following formulacm:
Wherein: QOutsideFor the air capacity entered in tunnel outside tunnel, unit: m3；QInside it isFor the air capacity in tunnel, unit: m3；tOutsideFor
Tunnel ambient temperature, unit: DEG C；tIt is interiorFor tunnel internal temperature, unit: DEG C.
9. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that step
In rapid S6, the mixing air heat Q that country rock body passes to tunnel internal is calculated according to the following formula:
Wherein: λ is country rock thermal coefficient, unit are as follows: Wm-1·℃-1；It is single for the temperature gradient of isothermal level normal direction
Position: DEG C/m；△ S is a small area on country rock body, unit: m2。
10. a kind of calculation method in tunnel in cold regions winter protection door temperature field according to claim 1, which is characterized in that
In step S6, the heat that calculating surrounding rock tunnel country rock body passes to tunnel internal mixing air according to the following formula is scaled tunnel
The increased temperature difference △ t of internal mix air:
Wherein: Q is the mixing air heat that country rock body passes to tunnel internal, unit: w；Specific heat capacity of the c for substance, unit:
kg.℃；ρ is material density, unit: kg/m3；V is the volume of heat transmitting in tunnel, unit: m3；
The mixing air temperature T of tunnel internal is calculated according to the following formulah:
Th=tcm+Δt
Wherein: tcmFor the winter protection door opening time section inner tunnel in mixed gas temperature, unit: DEG C；△ t is surrounding rock tunnel country rock
The heat that body passes to tunnel internal mixing air is scaled the increased temperature difference of tunnel internal mixing air, unit: DEG C.
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Cited By (1)
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| CN113153424A (en) * | 2021-04-20 | 2021-07-23 | 石家庄铁道大学 | Cold region tunnel heat preservation device and calculation method of jet air speed and temperature thereof |
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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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| CN113153424A (en) * | 2021-04-20 | 2021-07-23 | 石家庄铁道大学 | Cold region tunnel heat preservation device and calculation method of jet air speed and temperature thereof |
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| CN109918844B (en) | 2023-04-07 |
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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 |