A method and system for testing the air volume of each branch of a post-disaster connected tunnel ventilation system

Abstract

The present application relates to the technical field of tunnel fire prevention and control, and provides a method and system for testing the air volume of each branch of a ventilation system containing a connected tunnel after a disaster. In this method, based on a pre-constructed wind resistance model of a fire source branch after a disaster containing a connected tunnel, the wind resistance of the fire source branch tunnel after a disaster is determined, and a wind resistance correlation model of the wind resistance of the fire source branch after a disaster and the wind resistance of the non-fire source branch tunnel before a disaster is established; then, according to the wind resistance of the fire source branch after a disaster, the fan characteristic parameters of the ventilation system, and the wind resistance correlation model, the total wind volume of the ventilation system after a disaster is determined; finally, according to the wind resistance of the fire source branch after a disaster and the total wind volume of the ventilation system after a disaster, and the wind resistance of the non-fire source branch before a disaster, the wind volume of the fire source branch after a disaster and the wind volume of the non-fire source branch after a disaster are determined, so as to realize the prediction of each branch component of any ventilation system containing a connected tunnel, and effectively solve the problem of predicting and warning the development trend of wind network disorder under fire disturbance.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel fire prevention and control, and in particular to a method and system for testing the air volume of each branch of a ventilation system of a connected tunnel after a disaster. Background Art

[0002] With the development of society, in order to meet the needs of human production and life, tunnels have gradually shown a complex network structure. Tunnel fire is one of the biggest risks that tunnels need to face in their entire life cycle. Although the occurrence of fire has a low probability, the economic losses and social harm it causes are huge.

[0003] After a fire occurs in a tunnel, the wind resistance of the fire source branch changes due to the throttling effect and buoyancy effect, which in turn causes changes in the fire source branch air volume and the air volume of the entire ventilation system. When the fire source branch air volume decreases to a certain value, smoke flow will be reversed, threatening the safety of personnel on the upwind side of the fire source, and even causing the side branch air flow to reverse, further expanding the scope of the disaster. Therefore, after a fire occurs, it is necessary to calculate the ventilation system air volume and adjust the air volume according to ventilation structures such as dampers and windows to achieve a new balance in the ventilation system.

[0004] The air volume can generally be measured by an anemometer, or obtained based on a wind pressure gauge and the law of ventilation resistance. However, after a fire occurs, the counterattack of high-temperature smoke may cause damage to the instruments of the branches downwind of the fire source, making it impossible to obtain the actual air volume. Therefore, it is urgent to provide a technical solution to address the above-mentioned deficiencies in the existing technology. Summary of the invention

[0005] The purpose of the present application is to provide a method and system for testing the air volume of each branch of a ventilation system including interconnected tunnels after a disaster, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides a method for testing the air volume of each branch of a ventilation system containing a connected tunnel after a disaster, which is used to determine the branch air volume of each branch tunnel in the ventilation system containing a connected tunnel. The method comprises: step S101, based on a pre-constructed post-disaster fire source branch wind resistance model of the fire source branch tunnel containing the connected tunnel, determining the post-disaster fire source branch wind resistance of the fire source branch tunnel containing the connected tunnel after a fire occurs; step S102, establishing a wind resistance of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel containing the connected tunnel Association model; step S103, determining the total air volume of the ventilation system after the disaster according to the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance association model; step S104, determining the post-disaster fire source branch air volume of the fire source branch tunnel according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system; and based on the air volume balance law, determining the post-disaster non-fire source branch air volume of the non-fire source branch tunnel according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume.

[0008] Preferably, in step S102, the wind resistance correlation model is:

[0009]

[0010] In the formula, is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system, R 23 is the post-disaster fire branch wind resistance of the fire branch tunnel, R 24 The wind resistance of the adjacent branch tunnel of the fire source before the disaster of the adjacent branch tunnel of the fire source branch tunnel;

[0011] is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the ventilator in the ventilation system, R 35 is the wind resistance of the branch tunnel downwind of the fire source before the disaster, R 46 It is the wind resistance of the adjacent branch tunnel on the downwind side of the fire source before the disaster of the adjacent branch tunnel of the downwind side branch tunnel.

[0012] Preferably, in step S103, according to the formula:

[0013]

[0014] Determine the total post-disaster air volume q of the ventilation system T ;

[0015] Wherein, A is the total pressure of the fan when the fan air volume is 0 in the ventilation system, b is the slope of the characteristic curve of the fan; R12 is the wind resistance of the air inlet tunnel including the connecting tunnel, The post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system; It is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the fans in the ventilation system.

[0016] Preferably, in step S104, according to the formula:

[0017]

[0018] Determine the post-disaster fire source branch air volume q 23 ; In the formula, is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system, r 23 is the post-disaster fire branch wind resistance of the fire branch tunnel, q T is the total post-disaster air volume of the ventilation system.

[0019] Preferably, in step S104, according to the formula:

[0020]

[0021] Determine the post-disaster non-fire source branch air volume;

[0022] In the formula, q T is the total air volume of the ventilation system after the disaster, q 23 is the post-disaster fire source branch air volume of the fire source branch tunnel; q 24 The post-disaster fire source adjacent branch air volume of the adjacent branch tunnel of the fire source branch tunnel; is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the ventilator in the ventilation system; R 35 is the wind resistance of the branch tunnel on the downwind side of the fire source before the disaster; q 46 is the wind volume of the adjacent branch tunnel on the downwind side of the fire source after the disaster of the adjacent branch tunnel of the downwind side branch tunnel, q 43 The post-disaster connecting branch air volume of the connecting branch tunnel that connects the fire source branch tunnel and the adjacent branch tunnel.

[0023] The embodiment of the present application also provides a post-disaster branch air volume testing system for a ventilation system including interconnected tunnels, which is used to determine the branch air volume of each branch tunnel in the ventilation system including interconnected tunnels, and the system includes:

[0024] A post-disaster fire source branch wind resistance unit is configured to determine the post-disaster fire source branch wind resistance of the fire source branch tunnel including the connecting tunnel after a fire occurs based on a pre-constructed post-disaster fire source branch wind resistance model of the connecting tunnel;

[0025] A tunnel wind resistance association model unit is configured to establish a wind resistance association model of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel containing the connecting tunnel;

[0026] a post-disaster ventilation unit configured to determine the post-disaster total air volume of the ventilation system according to the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance association model;

[0027] The branch air volume unit is configured to determine the post-disaster fire source branch air volume of the fire source branch tunnel according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system; and based on the air volume balance law, determine the post-disaster non-fire source branch air volume of the non-fire source branch tunnel according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume.

[0028] Beneficial effects:

[0029] The embodiment of the present application provides a method for testing the air volume of each branch of a ventilation system containing interconnected tunnels after a disaster, which is used to determine the branch air volume of each branch tunnel in the ventilation system containing interconnected tunnels, wherein, firstly, based on a pre-constructed post-disaster fire source branch wind resistance model of the interconnected tunnel, the post-disaster fire source branch wind resistance of the fire source branch tunnel containing the interconnected tunnel after a fire occurs is determined; then, a wind resistance correlation model of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel containing the interconnected tunnel is established; then, the post-disaster total wind speed of the ventilation system is determined based on the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance correlation model. volume; finally, according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system, the post-disaster fire source branch air volume of the fire source branch tunnel is determined; and based on the air volume balance law, according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume, the post-disaster non-fire source branch air volume of the non-fire source branch tunnel is determined, so as to realize the prediction of each branch component of any ventilation system containing interconnected tunnels, effectively solve the influence of wind flow reversal caused by smoke flow back on air volume measurement, realize the prediction and early warning of the development trend of wind network disorder under fire disturbance, provide a theoretical basis for determining the air volume adjustment of the ventilation system after the disaster, and improve the safety of personnel on the upwind side of the fire source. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0031] in:

[0032] Figure 1 A flow chart of a method for testing the air volume of each branch of a ventilation system including interconnected tunnels after a disaster provided according to some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the principle of a ventilation system including interconnected tunnels provided according to some embodiments of the present application;

[0034] Figure 3 A structural schematic diagram of a post-disaster branch air volume testing system including a connected tunnel ventilation system provided according to some embodiments of the present application. DETAILED DESCRIPTION

[0035] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0036] The wind turbulence caused by mine fire seriously endangers the safety of underground personnel and equipment. In actual mine fires, due to the uncertainty of tunnel damage and fire development, the key parameters in the tunnel related to wind resistance calculation will change with the development of the fire and are not easy to obtain. After a fire occurs in a tunnel, under the action of throttling effect and buoyancy effect, the wind resistance of the fire source branch changes accordingly, which in turn causes changes in the air volume of the fire source branch and the air volume of the entire ventilation system. At present, the wind flow of the branch tunnel is mainly obtained by anemometer measurement or based on wind pressure gauge and ventilation resistance law. However, after a fire occurs, the counterattack of high-temperature smoke flow may cause damage to the instruments of each branch on the downwind side of the fire source, and the actual air volume cannot be obtained, which brings great safety hazards to tunnel ventilation.

[0037] According to the existing wind resistance calculation method, the wind network of the tunnel during the mine fire period is calculated, especially the analysis of the change of the branch resistance of the fire source will produce a large error, which will interfere with the prediction and early warning of the development trend of wind network disorder under the fire disturbance. Based on this, the embodiment of the present application proposes a method for testing the branch air volume of each branch of the ventilation system containing interconnected tunnels after the disaster, which is used to determine the branch air volume of each branch tunnel in the ventilation system containing interconnected tunnels, such as Figure 1 , Figure 2 As shown, the test method includes:

[0038] Step S101: determining the post-disaster fire source branch wind resistance of the fire source branch tunnel including the connecting tunnel after a fire occurs based on the pre-constructed post-disaster fire source branch wind resistance model including the connecting tunnel.

[0039] In the embodiment of the present application, a post-disaster fire source branch wind resistance model including a connected tunnel is constructed:

[0040]

[0041] In the formula, R 23 It is the post-disaster fire source branch wind resistance of the fire source branch tunnel;

[0042] ρ T is the gas density on the upwind side of the fire source in the fire source branch tunnel after the disaster, ρ 0 is the wind flow gas density of the branch tunnel before the disaster (the same for each branch tunnel); R 0 is the fire source branch wind resistance of the fire source branch tunnel before the disaster; g a is the air compressibility factor, L D is the length of the fire source branch tunnel, L f is the distance between the fire source and the air inlet of the fire source branch tunnel, α is the inclination angle of the fire source branch tunnel, D H is the hydraulic diameter of the fire source branch tunnel section, T h is the temperature downwind of the fire source at a distance x from the airflow entrance of the branch tunnel of the fire source, T T is the wind flow temperature at the entrance of the branch tunnel of the fire source before the disaster, f is the pressure coefficient, when the wind flow in the tunnel is turbulent, f=0.316 / Re 1 / 4 .

[0043] ρ h is the gas density on the downwind side of the fire source after the fire branch tunnel, A is the cross section of the fire branch tunnel, v h is the wind speed at the exit of the branch tunnel of the fire source after the disaster, c p is the specific heat capacity of the gas in the fire source branch tunnel, v T is the wind speed at the entrance of the branch tunnel of the fire source after the disaster, U is the circumference of the branch tunnel of the fire source, ρ a CO generated by the combustion of combustibles in the fire source branch tunnel 2 The density, H c is the calorific value of combustion of combustibles, K a CO in chemical thermal equilibrium 2 Production volume, It is the increase in carbon dioxide produced by the combustion of combustible materials in the branch tunnels of the fire source after the disaster.

[0044] Under ideal conditions, the wind volume flowing into and out of the tunnel is equal, and the tunnel cross-section remains unchanged, so the wind speed flowing into and out of the tunnel is the same, and the wind flow density on the upwind side of the fire source remains unchanged. In other words, the post-disaster tunnel entrance wind speed v of the fire source branch tunnel is T The wind speed v at the tunnel exit after the disaster h equal, and ignoring the density of the fire source upwind side of the fire source branch tunnel (ρ T , that is, T =ρ 0 ), the wind resistance model of the fire source branch after the disaster is deformed into:

[0045]

[0046] In the embodiment of the present application, by building a tunnel fire test model of similar proportions, the pre-disaster branch wind resistance of each branch tunnel of the ventilation system including the interconnected tunnel (including the branch wind resistance of the fire source tunnel and the branch wind resistance of the non-fire source branch tunnel) is determined. Specifically, according to the formula:

[0047]

[0048] In the formula, R i is the pre-disaster branch wind resistance of the i-th branch tunnel in the interconnecting tunnel, P i is the pre-disaster branch wind pressure of the i-th branch tunnel, representing the difference between the tunnel inlet pressure and the tunnel outlet pressure of the i-th branch tunnel; q i is the pre-disaster branch air volume of the i-th branch tunnel, where i is a positive integer.

[0049] Step S102: establishing a wind resistance correlation model between the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnels including the interconnecting tunnels.

[0050] In the embodiment of the present application, a tunnel fire test model of similar proportion is constructed to determine the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel, and then a wind resistance correlation model between the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance is constructed. Specifically,

[0051]

[0052] In the formula, q 23 is the post-disaster fire source branch air volume of the fire source branch tunnel, q T is the total air volume of the ventilation system after the disaster, q 24 is the wind resistance of the adjacent branch tunnel of the fire source branch tunnel before the disaster; R 43 is the wind resistance of the connecting branch tunnel connecting the fire source branch tunnel and the adjacent branch tunnel after the disaster, q 43 The post-disaster connecting branch air volume of the connecting branch tunnel that connects the fire source branch tunnel and the adjacent branch tunnel;

[0053] R 35 is the wind resistance of the branch tunnel downwind of the fire source before the disaster, q 35 is the branch air volume on the downwind side of the branch tunnel of the fire source before the disaster; R 46 is the wind resistance of the adjacent branch tunnel on the downwind side of the fire source before the disaster, q 46 It is the air volume of the adjacent branch tunnel on the downwind side of the fire source before the disaster of the adjacent branch tunnel on the downwind side.

[0054] In the mine ventilation network, the wind pressure difference between the two ends of the branch tunnel is very small and usually negligible. Therefore, here, the definition is:

[0055]

[0056] Therefore, we have:

[0057]

[0058] According to the air volume balance law:

[0059] q T =q 24 +q 23 Then we have:

[0060]

[0061] again:

[0062]

[0063] but:

[0064]

[0065] thus:

[0066]

[0067] Similarly, we can get:

[0068]

[0069] Then, the wind resistance correlation model is obtained as follows:

[0070]

[0071] In the formula, is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system, R 23 is the post-disaster fire branch wind resistance of the fire branch tunnel, R24 The wind resistance of the adjacent branch tunnel of the fire source branch tunnel before the disaster;

[0072] is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the fans in the ventilation system, R 35 is the wind resistance of the branch tunnel downwind of the fire source before the disaster, R 46 It is the wind resistance of the adjacent branch tunnel on the downwind side of the fire source before the disaster of the adjacent branch tunnel on the downwind side.

[0073] Step S103, determining the total air volume of the ventilation system after the disaster according to the branch wind resistance of the fire source after the disaster, the fan characteristic parameters of the ventilation system, and the wind resistance model.

[0074] In this application, in the series wind path of the ventilation system, the total wind pressure is equal to the sum of the branch wind pressures of each branch tunnel. Therefore, according to the formula:

[0075]

[0076] Determine the total wind pressure P of the ventilation system T ;

[0077] The wind pressure P provided by the fan is:

[0078] P=A-bq T

[0079] In the formula, A is the total pressure of the fan when the fan air volume is 0 in the ventilation system, and b is the slope of the fan characteristic curve, which is equal to the ratio of the total pressure of the fan to the maximum air volume. The wind pressure of the fan is equal to the total wind pressure in the ventilation system, that is, P T =P, so that the wind flow occurs, there are:

[0080]

[0081] Then the total air volume q of the ventilation system after the disaster is obtained T :

[0082]

[0083] In the formula, R 12 is the wind resistance of the air inlet tunnel including the connecting tunnel, It is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system; It is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnel of the downwind branch tunnel relative to the air volume of the fans in the ventilation system.

[0084] Step S104, determine the post-disaster fire source branch air volume of the fire source branch tunnel according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system, and based on the air volume balance law, determine the post-disaster non-fire source branch air volume of the non-fire source branch tunnel according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume.

[0085] In this application, according to the formula:

[0086]

[0087] Determine the post-disaster fire source branch air volume q 23 ; In the formula, is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system, R 23 is the post-disaster fire branch wind resistance of the fire branch tunnel, q T is the total post-disaster air volume of the ventilation system.

[0088] According to the formula:

[0089]

[0090] Determine the non-fire source branch air volume after the disaster; where q T is the total air volume of the ventilation system after the disaster, q 23 is the post-disaster fire source branch air volume of the fire source branch tunnel; q 24 The post-disaster branch air volume of the fire source adjacent branch tunnel of the fire source branch tunnel; R is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the fans in the ventilation system; 35 is the wind resistance of the branch tunnel downwind of the fire source before the disaster; q 46 is the wind volume of the adjacent branch tunnel on the downwind side of the fire source after the disaster, q 43 The post-disaster connecting branch air volume of the connecting branch tunnel that connects the fire source branch tunnel and the adjacent branch tunnel.

[0091] like Figure 3 As shown, the embodiment of the present application also provides a post-disaster branch air volume test system for a ventilation system including interconnected tunnels, which is used to determine the branch air volume of each branch tunnel in the ventilation system including interconnected tunnels. The test system includes:

[0092] The post-disaster fire source branch wind resistance unit 301 is configured to determine the post-disaster fire source branch wind resistance of the fire source branch tunnel including the connected tunnel after the fire occurs based on a pre-built post-disaster fire source branch wind resistance model including the connected tunnel;

[0093] The tunnel wind resistance correlation model unit 302 is configured to establish a wind resistance correlation model of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel including the connected tunnel;

[0094] The post-disaster ventilation unit 303 is configured to determine the post-disaster total air volume of the ventilation system according to the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance correlation model;

[0095] The branch air volume unit 304 is configured to determine the post-disaster fire source branch air volume of the fire source branch tunnel based on the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system; and based on the air volume balance law, determine the post-disaster non-fire source branch air volume of the non-fire source branch tunnel based on the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume.

[0096] The post-disaster ventilation system including interconnected tunnels and the branch air volume testing system provided in the embodiment of the present application can implement the steps and processes of the post-disaster ventilation system including interconnected tunnels and the branch air volume testing method of any of the above embodiments, and achieve the same technical effects, which will not be described one by one here.

[0097] In the description of the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for testing the air volume of each branch of a ventilation system including a connected tunnel after a disaster, characterized in that: The method is used to determine the branch air volume of each branch tunnel in a ventilation system including a connected tunnel, and the method comprises: Step S101, determining the post-disaster fire source branch wind resistance of the fire source branch tunnel containing the connecting tunnel after a fire occurs based on the pre-constructed post-disaster fire source branch wind resistance model of the connecting tunnel; Step S102, establishing a wind resistance correlation model of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel containing the connecting tunnel; the wind resistance correlation model is: In the formula, is the post-disaster wind resistance of the ventilation unit composed of the fire source branch tunnel, the adjacent branch tunnels of the fire source branch tunnel and the connecting branch tunnel relative to the air volume of the ventilator in the ventilation system, R 23 is the post-disaster fire branch wind resistance of the fire branch tunnel, R 24 The wind resistance of the adjacent branch tunnel of the fire source before the disaster of the adjacent branch tunnel of the fire source branch tunnel; is the post-disaster wind resistance of the downwind branch tunnel of the fire source branch tunnel and the adjacent branch tunnels of the downwind branch tunnel relative to the air volume of the ventilator in the ventilation system, R 35 is the wind resistance of the branch tunnel downwind of the fire source before the disaster, R 46 The wind resistance of the adjacent branch tunnel on the downwind side of the fire source before the disaster of the adjacent branch tunnel of the downwind side branch tunnel; Step S103, according to the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance association model, according to the formula: Determine the total post-disaster air volume q of the ventilation system T ; Wherein, A is the total pressure of the fan when the fan air volume is 0 in the ventilation system, and b is the slope of the characteristic curve of the fan; R 12 is the wind resistance of the air inlet tunnel in the connecting tunnel; Step S104: according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system, according to the formula: Determine the post-disaster fire source branch air volume q of the fire source branch tunnel 23 ; and based on the law of air volume balance, according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume, the post-disaster non-fire source branch air volume of the non-fire source branch tunnel is determined.

2. The method for testing the air volume of each branch of the post-disaster connected tunnel ventilation system according to claim 1 is characterized in that: In step S104, according to the formula: Determine the post-disaster non-fire source branch air volume; In the formula, q T is the total air volume of the ventilation system after the disaster, q 23 is the post-disaster fire source branch air volume of the fire source branch tunnel; q 24 The post-disaster fire source adjacent branch air volume of the adjacent branch tunnel of the fire source branch tunnel; R 35 The wind resistance of the branch tunnel on the downwind side of the fire source before the disaster; q 46 is the wind volume of the adjacent branch tunnel on the downwind side of the fire source after the disaster of the adjacent branch tunnel of the downwind side branch tunnel, q 43 The post-disaster connecting branch air volume of the connecting branch tunnel that connects the fire source branch tunnel and the adjacent branch tunnel.

3. A post-disaster wind volume test system for each branch of a tunnel ventilation system, characterized in that: The method for testing the air volume of each branch of a ventilation system including interconnected tunnels after a disaster as described in any one of claims 1-2 is used to determine the branch air volume of each branch tunnel in the ventilation system including interconnected tunnels, and the system comprises: A post-disaster fire source branch wind resistance unit is configured to determine the post-disaster fire source branch wind resistance of the fire source branch tunnel including the connecting tunnel after a fire occurs based on a pre-constructed post-disaster fire source branch wind resistance model of the connecting tunnel; A tunnel wind resistance association model unit is configured to establish a wind resistance association model of the post-disaster fire source branch wind resistance and the pre-disaster non-fire source branch wind resistance of the non-fire source branch tunnel containing the connecting tunnel; a post-disaster ventilation unit configured to determine the post-disaster total air volume of the ventilation system according to the post-disaster fire source branch wind resistance, the fan characteristic parameters of the ventilation system, and the wind resistance association model; The branch air volume unit is configured to determine the post-disaster fire source branch air volume of the fire source branch tunnel according to the post-disaster fire source branch wind resistance and the post-disaster total air volume of the ventilation system; and based on the air volume balance law, determine the post-disaster non-fire source branch air volume of the non-fire source branch tunnel according to the pre-disaster non-fire source branch wind resistance and the post-disaster fire source branch air volume.

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