CN110781582B - Method for evaluating explosion consequences of underdrain - Google Patents
Method for evaluating explosion consequences of underdrain Download PDFInfo
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- CN110781582B CN110781582B CN201910954162.1A CN201910954162A CN110781582B CN 110781582 B CN110781582 B CN 110781582B CN 201910954162 A CN201910954162 A CN 201910954162A CN 110781582 B CN110781582 B CN 110781582B
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Abstract
The invention discloses an underground underdrain explosion consequence evaluation method, which carries out deep research on an underground underdrain explosion damage mode, analyzes three damage modes of fragments, overpressure and vibration generated by explosion in the experiment process by designing an underdrain explosion experiment, and constructs an underdrain explosion consequence evaluation model according to the experiment result, wherein the evaluation model comprises the following steps: three evaluation indexes, namely fragment damage, overpressure damage and vibration damage; two correction compensation factors, namely a social influence correction factor and a rescue compensation factor; the evaluation result can provide theoretical guidance for the supervision and maintenance of the underdrain in the later period, reduces or avoids the occurrence of underdrain explosion accidents, and has important significance for guaranteeing the safe operation of the urban lifeline.
Description
Technical Field
The invention relates to the technical field of underdrain, in particular to an underdrain explosion consequence evaluation method.
Background
In recent years, with the continuous acceleration of urbanization process, urban underground pipelines are complicated and intricate, once oil and gas pipelines leak, the pipelines are easy to diffuse to adjacent urban underground underdrains and other pipelines, so that explosion accidents of the urban underground underdrains are easy to happen, the distribution of the underdrains in cities is complicated and intricate, the influence range of the underdrains after explosion is large, and the explosion consequences are very serious. At present, many such explosion events occur at home and abroad, so that the explosion consequences of the underdrains need to be evaluated, and the underdrains with higher risks are identified so as to strengthen the management of the underdrains with higher risks.
In the prior art, the analysis of explosion rules and explosion consequences of confined spaces such as underground roadways, pipelines, pressure vessels and the like is mostly concentrated, and the analysis of the explosion rules and the explosion consequences of an underdrain with a special confined space is less. Moreover, the research results in the prior art are difficult to adapt to the type of underdrain explosion accident, which is mainly due to the following two reasons:
1. the particularity of the structure of the underdrain, the underdrain is a semi-closed space formed by the structures of a ditch, a canal, a river and the like and a cover plate, a large-area explosion venting area is arranged right above and at two ends of the underdrain, and the explosion damage mode and the damage effect are different from those of an underground roadway, a pipeline and a pressure container.
2. In the research in the prior art, the propagation rule and the damage effect of explosion shock waves, flames and the like in a limited space are mainly concerned, and the damage condition outside the limited space is less concerned; however, in addition to the common damage modes such as overpressure and vibration, the hidden channel explosion accident should also consider the fragment damage caused by explosion.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an underdrain explosion consequence evaluation method, which is used for carrying out deep research on an underground underdrain explosion damage mode, constructing an evaluation model of the underdrain explosion consequence according to related experimental results, providing theoretical guidance for later supervision and maintenance of the underdrain by using the evaluation results, reducing or avoiding the occurrence of underdrain explosion accidents and having important significance for guaranteeing the safe operation of urban life lines.
In order to achieve the purpose, the invention adopts the following technical scheme that:
an evaluation method of an underdrain explosion consequence is characterized in that an evaluation model of the underdrain explosion consequence is constructed, and the evaluation model is utilized to evaluate the underdrain explosion consequence;
the evaluation model of the underdrain explosion consequences comprises the following steps:
three evaluation indexes are respectively: fragment damage C1, overpressure damage C2 and vibration damage C3;
two correction compensation factors, which are respectively: a social influence correction coefficient Z1 and a rescue compensation coefficient Z2;
the evaluation model of the underdrain explosion consequences is as follows:
wherein C is the evaluation result of the explosion consequence of the underdrain;
w represents a weight coefficient, w C1 Weight coefficient, w, representing the fragmentation damage C1 C2 Weight coefficient, w, representing overpressure damage C2 C3 A weight coefficient representing the vibration damage C3;
the action object of the fragment damage C1 is a person near the underground underdrain; the value mode of the fragment damage C1 is as follows:
C1＝A1·P；
wherein P represents population density near the underground underdrain; a1 represents the action area of the fragment damage C1 on personnel near the underground underdrain;
objects of action of overpressure damage C2 include personnel and buildings near underground underdrains; the overpressure damage C2 is valued in the following manner:
C2＝A21·P·w A21 +A22·P B ·w A22 ；
wherein P represents population density near the underground underdrain; p B Representing the density of buildings near the underground underdrains; w represents a weight coefficient, w A21 Weight coefficient, w, representing the injury of a person by overpressure injury C2 A22 A weight coefficient representing damage to the building caused by the overpressure damage C2; a21 represents the action area of overpressure damage C2 on personnel near the underground underdrain; a22 tableShowing the action area of overpressure damage C2 on buildings near the underground underdrains;
the vibration damage C3 is acted on other pipelines near the underground underdrain; the vibration damage C3 is obtained by the following steps:
C3＝A3·P S ；
wherein, P S The density of other pipelines near the underground underdrain is expressed by the number of pipelines in unit area, and the unit is strip/m 2 (ii) a A3 represents the area of action of the vibration damage C3 on other pipelines in the vicinity of the underground underdrain.
Designing an explosion experiment of the underdrain, analyzing three damage modes of fragments, overpressure and vibration generated by explosion in the experiment process, converting the experiment result into analysis suitable for the underdrain explosion scene with any size, and obtaining parameters in an evaluation model of the underdrain explosion consequence based on the converted experiment result so as to obtain the final evaluation model of the underdrain explosion consequence.
The shape of the corresponding action area in each damage mode is oblong, but the size of the damage radius R in each damage mode is not completely consistent, so the action area of the corresponding action area in each damage mode is a = pi R 2 +2RL; l represents the length of the underdrain to be evaluated.
The effective area A1 of the fragment damage C1 is:
A1＝πR F 2 +2R F L；
wherein L represents the length of the underdrain to be evaluated; r F The casting distance of the fragments is represented, namely the damage radius under the fragment damage mode;
fragment projection distance R F Comprises the following steps:
wherein mu represents the conversion rate of the total energy of the gas participating in the explosion into fragment kinetic energy;
s represents the cross-sectional area of the underdrain in the actual explosion process, namely the cross-sectional area of the underdrain to be evaluated, and the unit is m 2 ；
ρ 1 Expressed as combustible gas density in kg/m 3 ；
Q 1 Represents the combustion heat of combustible gas with kJ/kg;
a represents the air resistance coefficient, and the value range is 1.10-1.20;
s' represents the cross-sectional area of the cover above the underdrain in m 2 ；
ρ 2 Represents the average density of the cover above the underdrain in kg/m 3 ；
g represents the gravity acceleration, and the value is 9.8N/kg;
from the above, it can be seen that:
the action area A21 of the overpressure damage C2 on personnel near the underground underdrain is as follows:
A21＝πR B21 2 +2R B21 L；
wherein L represents the length of the underdrain to be evaluated; r B21 Representing the damage radius of personnel near the underground underdrain in an overpressure damage mode;
damage radius R to personnel near underground underdrain in overpressure damage mode B21 Get
S represents the cross-sectional area of the underdrain in the actual explosion process and is given in m 2 ；
The area of action a22 of the overpressure damage C2 on the building near the underground underdrain is:
A22＝πR B22 2 +2R B22 L；
wherein L represents the length of the underdrain to be evaluated; r B22 Representing the damage radius of a building near the underground underdrain under an overpressure damage mode;
damage radius R to buildings near underground underdrains in overpressure damage mode B22 Get
S represents the cross-sectional area of the underdrain in the actual explosion process and is given in m 2 。
The weight coefficient w of the damage of the overpressure damage C2 to the personnel is obtained according to an expert scoring method A21 A weight coefficient w of 0.6, which is the damage of overpressure damage C2 to buildings A22 The value is 0.4.
The action area A3 of the vibration damage C3 on other pipelines near the underground underdrain is as follows:
A3＝πR S 2 +2R S L；
wherein L represents the length of the underdrain to be evaluated; r S Representing the distance from the measuring point to the center of the explosion source, namely the damage radius under the vibration damage;
distance R from measuring point to center of explosion source S Get
S represents the cross section area of the underdrain in the actual explosion process, namely the cross section area of the underdrain to be evaluated;
from the above, it can be seen that:
the values of the obtained weight coefficients of the evaluation indexes, namely the fragment damage C1, the overpressure damage C2 and the vibration damage C3, are respectively as follows: w is a C1 The value of which is 0.33,w C2 The value of w is 0.59 C3 The value was 0.08.
The social influence correction coefficient Z1 refers to relevant negative influences caused after the underdrain is exploded, and the explosion position also greatly influences the explosion result of the underdrain; the value of the social influence correction coefficient Z1 is related to the type and the application of buildings near the underdrain, and the value of the social influence correction coefficient Z1 is shown in the following table:
the rescue compensation coefficient Z2 is the effect of rescue on the consequences of an explosion event after the underground channel is exploded, and the rescue compensation coefficient Z2 is the compensation coefficient f for fire rescue 1 And medical rescue compensation coefficient f 2 The rescue compensation coefficient Z2 is obtained by the following steps: z2= f 1 ·f 2 ；
The values of the rescue compensation coefficient Z2 are shown in the following table:
| radius of area | Value of Z2 |
| ≥5km | 1.3 |
| 5～10km | 1.2 |
| 10～15km | 1.1 |
| ≤15km | 1 |
In the upper table, the area radius refers to the distance between the rescue force position and the underdrain explosion position; the higher the control level is, the greater the effect of rescue on the consequences of the explosion event after the underground canal is exploded is, namely, the greater the value of the rescue compensation coefficient Z2 is.
The invention has the advantages that:
(1) The method and the device develop deep research on the explosion damage mode of the underground underdrain, construct an evaluation model of the underdrain explosion consequence according to related experimental results, provide theoretical guidance for later supervision and maintenance of the underdrain according to the evaluation results, reduce or avoid the occurrence of underdrain explosion accidents, and have important significance for guaranteeing safe operation of city life lines.
(2) The invention designs an explosion experiment of the underdrain, analyzes three damage modes of fragments, overpressure and vibration generated by explosion in the experiment process, converts the experiment result into the analysis and evaluation suitable for the underdrain explosion scene with any size, obtains a final evaluation model of the underdrain explosion result based on the converted experiment result, and has strong applicability; when the evaluation model of the underdrain explosion consequences provided by the invention is transferred to the analysis of the underdrain explosion scenes with other sizes, the evaluation of the explosion consequences of the underdrain to be evaluated can be completed only by acquiring the personnel density, the building density and the other pipeline density near the underdrain to be evaluated and the cross-sectional area of the underdrain to be evaluated.
(3) According to the method, two correction compensation factors are introduced on the basis of the analysis of the underdrain explosion, and the two correction compensation factors are quantized, so that the evaluation model of the underdrain explosion consequences provided by the method is closer to the actual situation, and can be effectively applied to the exploration of the urban underdrain explosion damage mode.
Drawings
Fig. 1 is a schematic diagram of an evaluation model of the consequences of an underdrain explosion according to the present invention.
Fig. 2 is a schematic diagram of the impact range of fragment ejection during underdrain explosion.
Fig. 3 is a graphical representation of overpressure values at various locations from the underdrain edge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses an evaluation method for the explosion consequences of an underdrain, which comprises the following steps: and constructing an evaluation model of the underdrain explosion consequences, and evaluating the underdrain explosion consequences by using the evaluation model.
As shown in fig. 1, the evaluation model of the consequences of the underdrain explosion includes:
three evaluation indexes are respectively: fragment damage C1, overpressure damage C2, vibration damage C3.
Two correction compensation factors, which are respectively: a social influence correction coefficient Z1 and a rescue compensation coefficient Z2.
The evaluation model of the underdrain explosion consequences is as follows:
wherein, C is the evaluation result of the explosion consequence of the underdrain.
w represents a weight coefficient, w C1 Weight coefficient, w, representing the fragmentation damage C1 C2 Weight coefficient, w, representing overpressure damage C2 C3 Represents the weight coefficient of the vibration damage C3.
The action object of the fragment damage C1 is a person near the underground underdrain; the value mode of the fragment damage C1 is as follows:
C1＝A1·P；
wherein P represents population density near the underground underdrain; a1 represents the area of action of the fragment damage C1 on personnel near the underground underdrain.
Objects of action of overpressure damage C2 include personnel and buildings near underground underdrains; the overpressure damage C2 is valued as follows:
C2＝A21·P·w A21 +A22·P B ·w A22 ；
wherein P represents population density near the underground underdrain; p B Representing the density of buildings near the underground underdrains; w represents a weight coefficient, w A21 Weight coefficient, w, representing the injury of a person by overpressure injury C2 A22 A weight coefficient representing damage to the building caused by the overpressure damage C2; a21 represents the action area of overpressure damage C2 on personnel near the underground underdrain; a22 represents the area of action of the overpressure damage C2 on the building near the underground underdrain.
The vibration damage C3 is acted on other pipelines near the underground underdrain; the vibration damage C3 is obtained by the following steps:
C3＝A3·P S ；
wherein, P S The density of other pipelines near the underground underdrain is expressed by the number of pipelines in unit area, and the unit is strip/m 2 (ii) a A3 represents the area of action of the vibration damage C3 on other pipelines near the underground underdrain.
In this embodiment, according to the explosion scene of crude oil leakage in the 11 · 22 Qingdao oil pipeline, an explosion experiment of a large-size underdrain of 1.
As shown in fig. 2, R is a lesion radius, i.e., an action radius, and the lesion radius R does not particularly indicate which lesion pattern is; the shapes of the corresponding action areas in the various damage modes are all long circles, and the sizes of the damage radii R in the various damage modes are not completely consistent, so that the action areas in the action areas corresponding to the various damage modes are all A = pi R 2 +2RL; l represents the length of the underdrain to be evaluated.
The action range of the fragment damage C1, namely the action area A1, depends on the kinetic energy acting on the cover plate when the combustible gas explodes, the total energy of the gas under the standard condition depends on the volume of the gas under the same volume fraction, namely the larger the volume of the underdrain, the larger the action range of the fragment damage C1 is.
Therefore, the effective area A1 of the chipping damage C1 is:
A1＝πR F 2 +2R F L；
wherein L represents the length of the underdrain to be evaluated; r F The throw distance of the fragment, i.e. the damage radius in the damage mode of the fragment, is indicated.
Throwing distance R when throwing angle is 45 degrees F At the most, therefore, the fragment ejection distance R is calculated according to the fragment ejection speed when the ejection angle is 45 degrees and the kinetic energy of each fragment F Comprises the following steps:
wherein mu represents the conversion rate of the total energy of the gas participating in the explosion into the fragment kinetic energy.
S represents the cross-sectional area of the underdrain in the actual explosion process, namely the cross-sectional area of the underdrain to be evaluated, and the unit is m 2 。
ρ 1 Expressed as combustible gas density in kg/m 3 。
Q 1 The heat of combustion of the combustible gas is expressed in kJ/kg.
a represents the air resistance coefficient, and the value range of a is 1.10-1.20.
S' represents the cross-sectional area of the cover above the underdrain in m 2 。
ρ 2 The average density of the cover over the underdrain is expressed in kg/m 3 。
g represents the gravity acceleration, and the value is 9.8N/kg.
From the above, it can be seen that:
as shown in fig. 3, the airborne explosion incident shock wave during the actual explosion process is measured according to the monitoring data of the free field pressure sensor. In the data monitored by the free field pressure sensor, the number of measuring points for measuring reliable pressure data comprises 7; the free field refers to a flow field which is not disturbed by the outside.
The experiment adopts a simulation ratio method, and can know that:
wherein R represents the distance between the target and the center of the explosive in the actual explosion process and has the unit of m.
R 0 The distance between the target and the center of the explosive during the experimental explosion is shown in m.
m TNT The explosive quantity of TNT in the actual explosion process is expressed in kg.
m TNT0 The explosive quantity of TNT in the experimental explosion process is expressed in kg.
S represents the cross-sectional area of the underdrain in the actual explosion process and is given in m 2 。
S 0 The cross-sectional area of the underdrain in the experimental explosion process is shown in m 2 。
According to the formula: distance between target and center of explosive in actual explosion process
The target refers to the action object of overpressure damage C2, namely people or buildings near the underground underdrain.
In the process of the underdrain explosion experiment, the obtained overpressure value delta P at a position 5m away from the edge of the underdrain is 0.02MPa.
The degree of injury to personnel near the underground underdrain from overpressure damage C2 during an underdrain explosion is shown in table 1 below, where S represents the cross-sectional area of the underdrain during actual explosion, i.e., the cross-sectional area of the underdrain to be evaluated.
TABLE 1
As can be seen from the above table 1, the overpressure value Δ P of 0.02MPa is a slight injury to people, and when the overpressure injury C2 causes slight injury to people near the underground underdrain, the distance between the people and the edge of the underdrain is
Therefore, under overpressure damage, the damage radius R to personnel near the underground closed channel B21 Fetch and hold>
Therefore, the area of action a21 of the overpressure damage C2 on personnel near the underground underdrain is:
A21＝πR B21 2 +2R B21 L；
where L represents the length of the underdrain to be evaluated.
The degree of damage to buildings near the underground underdrain by the overpressure damage C2 during an underdrain explosion is shown in table 2 below, where S in table 2 represents the cross-sectional area of the underdrain during actual explosion, i.e., the cross-sectional area of the underdrain to be evaluated.
TABLE 2
As can be seen from Table 2, the overpressure value Δ P of 0.02MPa is a partial failure of the building, and the overpressure lossWhen the injury C2 causes partial injury to buildings near the underground underdrain, the distance between the buildings and the edge of the underdrain is
Therefore, under the overpressure damage mode, the damage radius R of the building near the underground underdrain B22 Fetch and hold>
Therefore, the area a22 of the overpressure damage C2 acting on the building near the underground underdrain is:
A22＝πR B22 2 +2R B22 L；
where L represents the length of the underdrain to be evaluated.
In addition, the weight coefficient w of the injury of the overpressure injury C2 to the personnel is obtained according to an expert scoring method A21 A weight coefficient w of 0.6, which is the damage of overpressure damage C2 to buildings A22 The value is 0.4.
From the above, it can be seen that:
the action area A3 of the vibration damage C3 on other pipelines near the underground underdrain is as follows:
A3＝πR S 2 +2R S L；
wherein L represents the length of the underdrain to be evaluated; r S And (4) representing the distance from the measuring point to the center of the explosion source, namely the damage radius under the vibration damage.
K represents a correlation coefficient, and the value of K is related to rock properties, a blasting method and geological and topographic conditions; x is the power of x, and x represents the damping coefficient of blasting vibration; v represents the vibration velocity of mass points, namely the vibration velocity, and the unit is cm/s; m represents the loading in kg.
The values of the coefficients K and x under different rock properties in the underdrain explosion region are shown in table 3 below:
| lithological properties | Value range of K | Value range of x |
| Hard rock | 50～150 | 1.3～1.5 |
| Medium hard rock | 150～250 | 1.5～1.8 |
| Soft rock | 250～350 | 1.8～2.0 |
TABLE 3
Because the underdrain is formed by pouring C30 concrete, according to the above table 3, the correlation coefficient K is set to be 50, and the value of x which is set to the power of x is set to be 1.33.
According to the requirement of the anti-seismic index of the pipeline and the vibration safety criterion of the buried pipeline under the action of explosion, the maximum value of the vibration speed V is 3cm/s.
In the experiment process of the closed channel explosion, the vibration speed V at the position 2.5m away from the edge of the closed channel is 1.47cm/s, the charge m can be calculated according to the formula, and in the experiment process of the closed channel explosion, when vibration occurs, the vibration speed V is 1.47cm/sWhen the speed V is 3cm/s, the distance between the measuring point and the center of the explosion source is obtained by taking the distance RS from the measuring point to the edge of the underdrain by about 1.45m
S represents the cross-sectional area of the underdrain in the actual explosion process, i.e., the cross-sectional area of the underdrain to be evaluated.
From the above, it can be seen that:
the influence of each evaluation index in the urban underground underdrain explosion consequence evaluation model on the underdrain explosion consequence is different, so that each index needs to be given a proper weight value according to engineering experience and accident record analysis, and the evaluation index can also be determined by adopting methods such as hierarchical analysis and expert scoring.
In the invention, the three damage modes of the traditional explosion accident, fragment, overpressure and vibration have different damage degrees, and the important indexes among the different damage modes are given by consulting experts, and specifically the method comprises the following steps: the importance index of the fragment damage C1 to the overpressure damage C2 is 0.5, the importance index of the fragment damage C1 to the vibration damage C3 is 5, and the importance index of the overpressure damage C2 to the vibration damage C3 is 7, so that a judgment matrix X1 of the importance indexes among three damage modes when the underdrain is exploded can be constructed.
After the judgment matrix X1 of the importance indexes is calculated and consistency check is carried out, the weight coefficients of the fragment damage C1, the overpressure damage C2 and the vibration damage C3 which are all evaluation indexes can be obtained.
In the invention, reference values of the weight coefficients of fragment damage C1, overpressure damage C2 and vibration damage C3 are respectively as follows: w is a C1 The value of which is 0.33,w C2 The value of w is 0.59 C3 The value was 0.08.
The social influence correction coefficient Z1 refers to relevant negative influences caused after the underdrain is exploded, and the explosion position also greatly influences the explosion result of the underdrain; the value of the social influence correction coefficient Z1 is related to the type and the application of buildings near the underdrain.
The social influence correction coefficient Z1 has the following values as shown in table 4:
TABLE 4
The rescue compensation coefficient Z2 is the function of rescue on the consequence of an explosion event after the underground channel is exploded, and the rescue compensation coefficient Z2 is the compensation coefficient f of fire rescue 1 And medical rescue compensation coefficient f 2 The rescue compensation coefficient Z2 is characterized by comprising the following two parts: z2= f 1 ·f 2 ；
The values of the rescue compensation coefficient Z2 are shown in the following table 5:
| radius of area | Value of Z2 |
| ≥5km | 1.3 |
| 5～10km | 1.2 |
| 10～15km | 1.1 |
| ≤15km | 1 |
TABLE 5
In the upper table 5, the area radius refers to the distance between the rescue force position and the underdrain explosion position; the higher the control level is, the greater the effect of rescue on the consequences of the explosion event after the underground canal is exploded is, namely, the greater the value of the rescue compensation coefficient Z2 is.
By combining the above contents, the evaluation model for the result of the underdrain explosion is obtained as follows:
in the formula (I), the compound is shown in the specification,
therefore, when the evaluation model of the underdrain explosion consequences provided by the invention is transferred to the analysis and evaluation of underdrain explosion scenes with other sizes, only the personnel density P and the building density P near the underdrain to be evaluated need to be obtained B Other line density P S And the evaluation of the explosion result of the underdrain to be evaluated can be completed by the cross section area S of the underdrain to be evaluated. In addition, the invention introduces two correction compensation factors on the basis of the analysis of the underdrain explosion and quantizes the two correction compensation factors, so that the invention providesThe evaluation model of the result of the urban underdrain explosion is closer to the actual situation, and can be effectively applied to the exploration of the urban underdrain explosion damage mode.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The method for evaluating the consequences of the explosion of the underdrain is characterized by constructing an evaluation model of the consequences of the explosion of the underdrain and evaluating the consequences of the explosion of the underdrain by utilizing the evaluation model;
the evaluation model of the underdrain explosion consequences comprises the following steps:
three evaluation indexes are respectively: fragment damage C1, overpressure damage C2 and vibration damage C3;
two correction compensation factors, which are respectively: a social influence correction coefficient Z1 and a rescue compensation coefficient Z2;
the evaluation model of the underdrain explosion consequences is as follows:
wherein C is the evaluation result of the explosion consequence of the underdrain;
w represents a weight coefficient, w C1 Weight coefficient, w, representing the fragmentation damage C1 C2 Weight coefficient, w, representing overpressure damage C2 C3 A weight coefficient representing the vibration damage C3;
the action object of the fragment damage C1 is a person near the underground underdrain; the value mode of the fragment damage C1 is as follows:
C1＝A1·P；
wherein P represents population density near the underground underdrain; a1 represents the action area of the fragment damage C1 on personnel near the underground underdrain;
objects of action of overpressure damage C2 include personnel and buildings near underground underdrains; the overpressure damage C2 is valued in the following manner:
C2＝A21·P·w A21 +A22·P B ·w A22 ；
wherein P represents population density near the underground underdrain; p B Representing the density of buildings near the underground underdrains; w represents a weight coefficient, w A21 Weight coefficient, w, representing the injury of a person by overpressure injury C2 A22 A weight coefficient representing damage to the building caused by the overpressure damage C2; a21 represents the action area of overpressure damage C2 on personnel near the underground underdrain; a22 represents the action area of overpressure damage C2 on buildings near the underground underdrain;
the vibration damage C3 is acted on other pipelines near the underground underdrain; the vibration damage C3 is obtained by the following steps:
C3＝A3·P S ；
wherein, P S The density of other pipelines near the underground underdrain is expressed by the number of pipelines in unit area, and the unit is strip/m 2 (ii) a A3 represents the area of action of the vibration damage C3 on other pipelines near the underground underdrain.
2. The method for evaluating the consequences of the explosion of the underdrain according to claim 1, wherein an explosion experiment of the underdrain is designed, three damage modes of fragments, overpressure and vibration generated by explosion are analyzed in the experiment process, the experiment result is converted into an analysis suitable for an underdrain explosion scene with any size, and parameters in the evaluation model of the consequences of the explosion of the underdrain are obtained based on the converted experiment result, so that the final evaluation model of the consequences of the explosion of the underdrain is obtained.
3. The method for evaluating the consequences of an underdrain explosion according to claim 1 or 2, wherein the shape of the corresponding action area in each damage mode is oblong, and only the sizes of the damage radii R in each damage mode are not completely consistent, so that the action areas of the corresponding action areas in each damage mode are all a = pi R 2 +2RL; l represents the length of the underdrain to be evaluated.
4. The method for assessing the consequences of an underdrain explosion according to claim 2,
the effective area A1 of the fragment damage C1 is:
A1＝πR F 2 +2R F L；
wherein L represents the length of the underdrain to be evaluated; r F The casting distance of the fragments is represented, namely the damage radius in the fragment damage mode;
fragment projection distance R F Comprises the following steps:
wherein mu represents the conversion rate of the total energy of the gas participating in the explosion into fragment kinetic energy;
s represents the cross-sectional area of the underdrain in the actual explosion process, namely the cross-sectional area of the underdrain to be evaluated, and the unit is m 2 ；
ρ 1 Expressed as combustible gas density in kg/m 3 ；
Q 1 Represents the combustion heat of combustible gas with kJ/kg;
a represents the air resistance coefficient, and the value range is 1.10-1.20;
s' represents the cross-sectional area of the cover above the underdrain in m 2 ；
ρ 2 Represents the average density of the cover above the underdrain in kg/m 3 ；
g represents the gravity acceleration, and the value is 9.8N/kg;
from the above, it can be seen that:
5. the method for assessing the consequences of an underdrain explosion according to claim 2,
the action area A21 of the overpressure damage C2 on personnel near the underground underdrain is as follows:
A21＝πR B21 2 +2R B21 L；
wherein L represents the length of the underdrain to be evaluated; r B21 Representing the damage radius of personnel near the underground underdrain in an overpressure damage mode;
damage radius R to personnel near underground underdrain in overpressure damage mode B21 Get
S represents the cross-sectional area of the underdrain in the actual explosion process and is given in m 2 ；
The area of action a22 of the overpressure damage C2 on the building near the underground underdrain is:
A22＝πR B22 2 +2R B22 L；
wherein L represents the length of the underdrain to be evaluated; r B22 Representing the damage radius of a building near the underground underdrain under an overpressure damage mode;
damage radius R to buildings near underground underdrains in overpressure damage mode B22 Get
S represents the cross-sectional area of the underdrain in the actual explosion process and is given in m 2 。
6. The method for evaluating the consequences of an underdrain explosion according to claim 5, wherein the weighting factor w for the injury of personnel due to overpressure damage C2 is obtained according to an expert scoring method A21 A weight coefficient w of 0.6, which is the damage of overpressure damage C2 to buildings A22 The value is 0.4.
7. The method for evaluating the consequences of an underdrain explosion according to claim 2, wherein the area A3 of the vibration damage C3 acting on other pipelines near the underground underdrain is:
A3＝πR S 2 +2R S L；
wherein L represents the length of the underdrain to be evaluated; r S Representing the distance from the measuring point to the center of the explosion source, namely the damage radius under the vibration damage;
distance R from measuring point to center of explosion source S Get
S represents the cross section area of the underdrain in the actual explosion process, namely the cross section area of the underdrain to be evaluated;
from the above, it can be seen that:
8. the method for evaluating the consequences of the explosion of the underdrain according to claim 1 or 2, wherein the values of the obtained evaluation indexes, namely the weight coefficients of the fragment damage C1, the overpressure damage C2 and the vibration damage C3, are respectively as follows: w is a C1 The value of which is 0.33,w C2 The value is 0.59,w C3 The value was 0.08.
9. The method for evaluating the consequences of the explosion of the underdrain according to claim 1 or 2, wherein the social influence correction coefficient Z1 refers to the related negative influence caused by the explosion of the underdrain, and the explosion position greatly influences the consequences of the explosion of the underdrain; the value of the social influence correction coefficient Z1 is related to the type and the application of buildings near the underdrain, and the value of the social influence correction coefficient Z1 is shown in the following table:
10. the method for evaluating the consequences of an explosion in the underdrain according to claim 1 or 2, wherein the rescue compensation factor Z2 is the effect of rescue on the consequences of an explosion event after the underdrain is exploded, and the rescue compensation factor Z2 is determined by a fire rescue compensation factor f 1 And medical rescue compensation coefficient f 2 The rescue compensation coefficient Z2 is obtained by the following steps: z2= f 1 ·f 2 ；
The values of the rescue compensation coefficient Z2 are shown in the following table:
In the upper table, the area radius refers to the distance between the rescue force position and the underdrain explosion position; the higher the control level is, the greater the effect of rescue on the consequences of the explosion event after the underground canal is exploded is, namely, the greater the value of the rescue compensation coefficient Z2 is.
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