A calculation method based on absolute gas emission quantity of underground engineering construction

Abstract

The application discloses a kind of based on underground engineering construction absolute gas emission quantity calculation method, belong to underground engineering safety field, a kind of based on underground engineering construction absolute gas emission quantity calculation method, including core desorption curve calculation absolute gas emission quantity model, core desorption curve calculation absolute gas emission quantity model includes new exposed rock mass gas emission quantity Q1, new exposed rock wall gas emission quantity Q2 and absolute gas emission quantity Q 绝 The application can achieve the purposes of wide application range, strong operability, few test times and calculation process in line with objective laws, is suitable for all types of harmful gases, needs fewer parameters for calculation, does not increase additional tests, and only needs to record desorption gas amounts at different times during core field desorption, so that the entire calculation process is completely in line with the observation rules of gas emission, effectively improving the accuracy of gas emission calculation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of underground engineering construction safety, more particularly, to a kind of based on underground engineering construction absolute gas emission calculation method. BACKGROUND

[0002] Absolute gas emission is an important index of underground engineering harmful gas hazard zoning evaluation, therefore, the application of absolute gas emission calculation method is crucial for underground engineering harmful gas hazard evaluation;《Technical Code for Railway Gas Tunnel》and《Technical Code for Design and Construction of Highway Gas Tunnel》have established coal seam gas absolute gas emission calculation method, which is only applicable to coal seam.

[0003] The existing absolute gas emission calculation method has the following limitations: the existing absolute gas emission calculation method has a very narrow scope of application, which is only applicable to coal seam gas, and cannot be used to calculate absolute gas emission when underground engineering construction encounters conventional oil and gas, shale gas, biogas and other types of harmful gas;The existing absolute gas emission calculation method uses total gas content minus residual gas content to calculate the gas emission of falling coal blocks, which does not establish a relationship with time, does not conform to the objective law of gas diffusion, and requires parameters such as moisture, ash content and residual gas content of equivalent combustible material, which is difficult to operate due to the need for many parameters;The existing absolute gas emission calculation method uses a fixed decay curve to calculate the gas emission of newly exposed coal wall, which does not conform to scientific principles. SUMMARY

[0004] 1. Technical problems to be solved

[0005] In view of the problems in the prior art, the present application aims to provide a kind of based on underground engineering construction absolute gas emission calculation method, which can realize wide application range, strong operability, less test times and calculation process conforming to objective law, not only suitable for all types of harmful gas, but also requiring fewer parameters, without additional tests, only need to record the desorption gas amount at different times during core desorption, so that the entire calculation process fully conforms to the gas emission observation law, effectively improving the accuracy of gas emission calculation.

[0006] 2. Technical scheme

[0007] To solve the above problems, the present application adopts the following technical scheme.

[0008] A kind of based on underground engineering construction absolute gas emission calculation method, including core desorption curve calculation absolute gas emission model:

[0009] S1, first calculate the new exposed rock mass gas emission Q1, the new exposed rock mass gas emission Q1 Calculation formula is as follows:

[0010]

[0011] In the formula, m is the mass of the desorbed core, M is the total mass of the newly exposed rock mass, v1 is the volume of gas desorption in the calculation time interval, unit: m 3 , t2 is the termination time of the calculation, unit: min, t1 is the starting time of the calculation, unit: min;

[0012] S2, then calculate the newly exposed rock wall gas emission Q2, the calculation formula of the newly exposed rock wall gas emission Q2 is as follows:

[0013]

[0014] In the formula, s is the surface area of the desorbed core, S is the total area of the newly exposed rock wall, v2 is the volume of gas desorption in the calculation time interval, unit: m 3 , t4 is the termination time of the calculation, unit: min, t3 is the starting time of the calculation, unit: min;

[0015] S3, finally, the absolute gas emission model is calculated according to the core desorption curve to obtain the absolute gas emission Q 绝 , the calculation formula of the absolute gas emission Q 绝 is as follows:

[0016] Formula 3: Q 绝 = Q1+Q2

[0017] In the formula, the newly exposed rock mass gas emission Q1 is m 3 / min, Q2 is the newly exposed rock wall gas emission, unit: m 3 / min, the absolute gas emission Q 绝 is m 3 / min.

[0018] The method can achieve the purposes of wide application range, strong operability, few test times, and calculation process conforming to objective laws. The method is not only suitable for all types of harmful gases, but also requires fewer parameters for calculation, does not increase additional tests, and only needs to record the desorption gas amount at different times during core field desorption, so that the entire calculation process fully conforms to the gas emission observation rules, and the accuracy of gas emission calculation is effectively improved.

[0019] Further, the formula 3 ignores the amount of emission from the sprayed concrete section wall.

[0020] Further, the mass m of the desorbed core in the formula 1 is directly weighed to obtain.

[0021] Further, the total mass M of the newly exposed rock mass in the formula 1 is equal to the construction footage multiplied by the working face area multiplied by the rock density.

[0022] Further, the calculated start time t1, the calculated end time t2 and the core desorbed gas volume v1 in the formula 1 can be directly read from the core desorption curve.

[0023] Further, the core surface area s in the formula 2 is directly measured.

[0024] Further, the total new exposed rock wall area S in the formula 2 is equal to the construction footage multiplied by the chamber circumference plus the working face area.

[0025] Further, the calculated start time t3, the calculated end time t4 and the core desorbed gas volume v2 in the formula 2 can be directly read from the core desorption curve.

[0026] 3. Beneficial effects

[0027] Compared with the prior art, the advantages of the present application are:

[0028] (1) The scheme can achieve the purposes of wide application range, strong operability, few test times and calculation process conforming to objective laws, is not only suitable for all types of harmful gases, and needs fewer parameters to be calculated, at the same time, does not increase additional test, only needs to record the desorbed gas amount at different times during the core desorption on site, so that the whole calculation process completely conforms to the gas emission observation law, effectively improves the accuracy of the gas emission calculation. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The core desorption curve model diagram of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0033] Embodiment 1:

[0034] Please refer to Figure 1 A method for calculating absolute gas emission based on underground engineering construction, comprising a core desorption curve calculation absolute gas emission model:

[0035] S1, first calculate the new exposed rock mass gas emission Q1, the new exposed rock mass gas emission Q1 calculation formula as follows:

[0036]

[0037] In the formula, m is the mass of the desorbed core, M is the total mass of the newly exposed rock mass, v1 is the gas desorption volume in the calculation time interval, unit: m 3 , t2 is the termination time of calculation, unit: min, t1 is the starting time of calculation, unit: min;

[0038] S2, then calculate the new exposed rock wall gas emission Q2, the new exposed rock wall gas emission Q2 calculation formula as follows:

[0039]

[0040] In the formula, s is the surface area of the desorbed core, S is the total area of the newly exposed rock wall, v2 is the gas desorption volume in the calculation time interval, unit: m 3 , t4 is the termination time of calculation, unit: min, t3 is the starting time of calculation, unit: min;

[0041] S3, finally, the absolute gas emission Q 绝 , the absolute gas emission Q 绝 is calculated according to the core desorption curve calculation absolute gas emission model, and the calculation formula is as follows:

[0042] Formula 3: Q 绝 = Q1+Q2

[0043] In the formula, the new exposed rock mass gas emission Q1 is m 3 / min, and Q2 is the new exposed rock wall gas emission, unit: m 3 / min, absolute gas emission Q 绝 in m 3 / min.

[0044] The model can achieve the purposes of wide application range, strong operability, less test times and calculation process in line with objective laws, is suitable for all types of harmful gases, needs less parameters for calculation, does not increase additional tests, and only needs to record the desorption gas amounts at different times during core field desorption, so that the whole calculation process is completely in line with the observation laws of gas emission, and the accuracy of gas emission calculation is effectively improved.

[0045] The formula 3 ignores the emission amount of the shot concrete section hole wall.

[0046] The desorption core mass m in the formula 1 is directly weighed to obtain, the total mass M of the newly exposed rock mass is equal to the construction footage multiplied by the working face area multiplied by the rock density, and the starting calculation time t1, the ending calculation time t2 and the core desorption gas volume v1 can be directly read from the core desorption curve diagram.

[0047] The desorption core surface area s in the formula 2 is directly measured, the total area S of the newly exposed rock wall is equal to the construction footage multiplied by the hole circumference plus the working face area, and the starting calculation time t3, the ending calculation time t4 and the core desorption gas volume v2 can be directly read from the core desorption curve diagram.

[0048] Compared with the current absolute gas emission calculation method, the core desorption curve calculation absolute gas emission model proposed in the application has the following advantages: wide application range, suitable for all types of harmful gases, and the core measurable surface area can be applied to the model; strong operability, less parameters for calculation, and most of the parameters can be directly read from the core desorption curve; no additional tests are needed, only the desorption gas amounts at different times during core field desorption need to be recorded; the model adopts the mass and area analogy principle, and the whole calculation process is completely in line with the observation laws of gas emission.

[0049] The above is only a preferred specific embodiment of the application; however, the protection scope of the application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and improvement concepts of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A kind of based on underground engineering construction absolute gas emission calculation method, including core desorption curve calculation absolute gas emission model, it is characterized by: S1, first, obtain the gas emission Q1 of new exposed rock mass, the new exposed rock mass gas emission Q1 Calculation formula is as follows: Formula 1: where m is the mass of the desorbed core, M is the total mass of the newly exposed rock mass, v1 is the volume of gas desorption in the calculation time interval, unit: m 3 t2 is the termination time of the calculation, unit: min, and t1 is the starting time of the calculation, unit: min S2, then, obtain the gas emission Q2 of new exposed rock wall, the new exposed rock wall gas emission Q2 Calculation formula is as follows: Formula 2: where s is the desorbing core surface area, S is the total area of the newly exposed rock wall, v2 is the gas desorption volume in the calculation time interval, unit: m3 3 , t4 is the calculated end time, unit: min, t3 is the calculated start time, unit: min; S3、Finally, according to the core desorption curve, the absolute gas emission quantity model is calculated to obtain the absolute gas emission quantity Q 绝 , the absolute gas emission quantity Q 绝 The calculation formula is as follows: Formula 3: Q 绝 = Q1+ Q2 In the formula, the gas emission rate Q1 of the newly exposed rock block is expressed in m³. 3 / min, Q2 is the gas emission rate of the newly exposed rock face, in m³ / min. 3 / min, absolute gas emission Q 绝 The unit is m 3 / min.

2. The method according to claim 1, wherein the method is characterized by: The formula 3 ignores the emission of shotcrete section hole wall.

3. The method according to claim 1, wherein: The formula 1 directly weighs the mass m of desorption core.

4. The method according to claim 1, wherein The total mass M of new exposed rock mass in the formula 1 is equal to construction footage times face area times rock density.

5. The method according to claim 1, wherein The starting time t1 calculated, the calculated termination time t2 and the gas volume v1 of core desorption in the formula 1 can be directly read from the core desorption curve diagram.

6. The method for calculating the absolute gas emission quantity based on underground engineering construction according to claim 1, characterized in that: The surface area s of desorption core in the formula 2 is directly measured.

7. The method according to claim 1, wherein the method is characterized by: The total area S of new exposed rock wall in the formula 2 is equal to construction footage times chamber perimeter plus face area.

8. The method according to claim 1, wherein: The starting time t3 calculated, the calculated termination time t4 and the gas volume v2 of core desorption in the formula 2 can be directly read from the core desorption curve diagram.

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