CN109101678B - Determination method of blasting vibration safety criterion based on stress standard of liquid storage tank - Google Patents

Determination method of blasting vibration safety criterion based on stress standard of liquid storage tank Download PDF

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CN109101678B
CN109101678B CN201810651562.0A CN201810651562A CN109101678B CN 109101678 B CN109101678 B CN 109101678B CN 201810651562 A CN201810651562 A CN 201810651562A CN 109101678 B CN109101678 B CN 109101678B
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liquid storage
storage tank
stress
sigma
compressive stress
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CN109101678A (en
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钟冬望
周俊汝
李琳娜
何理
司剑峰
熊祖钊
金沐
李雷斌
缪晨辉
张建军
涂圣武
卢哲
吕权
杜泉
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention discloses a method for determining blasting vibration safety criteria based on a liquid storage tank stress standard. The technical proposal is as follows: the allowable compressive stress [ sigma ] of the axial direction of the tank wall is determined according to the APl650 standard of the United states]Then a numerical calculation model is established by a numerical simulation method, and then an axial compressive stress sigma of the stress weak point is caused by adopting a trial calculation method n Successive approximation of axial allowable compressive stress [ sigma ]]Obtain the explosion load safety limit value [ P ]]Finally, determining the safety limit value [ P ] of the explosive load of the liquid storage tank in the numerical calculation model]And dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k to obtain a blasting vibration speed safety criterion [ PPV ] based on the stress control of the liquid storage tank]. The invention has the advantages of simple and easy operation, reliable result, safety and economy, and provides visual blasting design basis and safety criterion for blasting construction of the adjacent large-scale liquid storage tank.

Description

Determination method of blasting vibration safety criterion based on stress standard of liquid storage tank
Technical Field
The invention relates to the technical field of determination of blasting vibration safety criteria. In particular to a method for determining blasting vibration safety criteria based on a stress standard of a liquid storage tank.
Background
The construction of petroleum reserves is an important link of an energy safety system in China, and a large-scale vertical liquid storage tank is a liquid storage tank widely adopted in the prior oil storage field, and because the oil storage field is large in scale, flammable and explosive fluids are stored, and the consequences are not envisaged if the oil storage field is damaged. Therefore, in order to ensure the safety of the liquid storage tank, the stress distribution, the power response and the like of the liquid storage tank need to be closely concerned. In the construction process of the oil storage base, due to topography reasons, some liquid storage tanks are built according to mountains, and the foundation of the subsequent extension engineering, traffic roads and the like are required to be blasted and excavated. The explosion construction of oil storage base inevitably produces the blasting disturbance to existing liquid storage pot, and when the blasting disturbance reaches certain intensity, the liquid storage pot can appear phenomenon sufficient buckling unstability etc. destroyed form under the excitation of blasting disturbance, and very probably lead to disasters such as conflagration, explosion, causes serious environmental pollution and economic loss. The existing blasting vibration safety criterion has proposed that the blasting disturbance intensity is limited by taking surface buildings, tunnels, roadways, rock high slopes and the like as protection objects, and the influence degree of blasting disturbance in oil storage base on the liquid storage tank is not considered, and the axial compressive stress of the wall of the liquid storage tank can reflect the influence degree of the blasting disturbance on the liquid storage tank.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and aims to provide a simple and easy-to-implement method for determining the blasting vibration safety criterion based on the stress standard of a liquid storage tank, which is reliable in result and safe and economical.
In order to achieve the above purpose, the steps of the technical scheme adopted by the invention are as follows:
step 1, according to the APl650 standard in the United states, determining the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank by utilizing the structural parameters of the liquid storage tank and the liquid parameters in the tank:
when (when)And when the method is used, the following steps are carried out:
when (when)And when the method is used, the following steps are carried out:
in the formula (1) and the formula (2):
[ sigma ] represents allowable axial compressive stress of the tank wall of the liquid storage tank, and Pa;
gamma represents the density of liquid in the liquid storage tank, kg/m 3 ；
H represents the total height of the tank body of the liquid storage tank, m;
d represents the diameter of the tank body of the liquid storage tank, m;
t s and represents the thickness of the tank wall of the liquid storage tank and m.
And 2, establishing a numerical calculation model through LS_DYNA power finite element numerical simulation software according to the geometric parameters and material parameters of the liquid in the liquid storage tank, the foundation and the liquid in the liquid storage tank.
Step 3, applying explosion load P on the foundation in the numerical calculation model through first trial calculation 1 The first trial calculation applies an explosive load P 1 ＝(0.5～1.5)×10 6 Pa, obtaining the axial pressure of the liquid storage tank in the numerical calculation modelThe distribution of force along the height of the tank wall and along the circumferential direction of the tank wall. Determining the stress weak point of the liquid storage tank in the numerical calculation model, wherein the stress weak point is the position where the axial compressive stress of the wall of the liquid storage tank is the maximum value, namely the explosion load P applied by the liquid storage tank in the first trial calculation in the numerical calculation model 1 Axial compressive stress sigma of stress weak point at time 1 。
Step 4, applying explosion load P on the foundation in the numerical calculation model through second trial calculation 2 The second trial calculation applies an explosive load P 2 ＝P 1 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the second trial calculation in the numerical calculation model 2 Axial compressive stress sigma of stress weak point at time 2 。
If the explosive load P is applied to the liquid storage tank in the numerical calculation model in the second trial calculation 2 Axial compressive stress sigma of stress weak point at time 2 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the third trial calculation 3 The third trial calculation applies an explosive load P 3 ＝P 2 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the third trial calculation in the numerical calculation model 3 Axial compressive stress sigma of stress weak point at time 3 。
……。
If the liquid storage tank applies explosive load P in the n-1 th trial calculation in the numerical calculation model n-1 Axial compressive stress sigma of stress weak point at time n-1 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the nth trial calculation n The nth trial calculation applies an explosive load P n ＝P n-1 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the n-th trial calculation in the numerical calculation model n Axial compressive stress sigma of stress weak point at time n 。
If the liquid storage tank applies explosive load P in the nth trial calculation in the numerical calculation model n Axial compressive stress sigma of stress weak point at time n Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Then at the numerical value meterTrial calculation of n+1th applied blast load P on foundation in calculation model n+1 The n+1th trial calculation applies the explosive load P n+1 ＝P n +ΔP, i.e. the explosion load P applied by the liquid storage tank in the n+1st trial calculation in the numerical calculation model n+1 Axial compressive stress sigma of stress weak point at time n+1 。
The delta P represents the increment of the explosion load of the trial-and-computation applied explosion load of two adjacent times, and delta P= (0.2-0.5) multiplied by 10 6 Pa。
If the liquid storage tank applies explosive load P in n+1st trial calculation in the numerical calculation model n+1 Axial compressive stress sigma of stress weak point at time n+1 Is larger than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Then the n-th trial calculation of the applied explosive load P is determined n Safety limit value for explosive load [ P ]]The method comprises the steps of carrying out a first treatment on the surface of the Then the safety limit value [ P ] of the explosion load applied to the liquid storage tank in the numerical calculation model is obtained]The blasting vibration velocity peak PPV of the foundation.
And step 5, dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k, wherein the importance correction coefficient k is 1.2-2, and thus the blasting vibration safety criterion [ PPV ] based on the stress standard of the liquid storage tank is obtained.
By adopting the technical scheme, compared with the prior art, the invention has the following positive effects:
the invention determines the allowable compressive stress [ sigma ] of the axial direction of the tank wall according to the APl650 standard in the United states]Establishing a numerical calculation model by a numerical simulation method, and enabling the axial compressive stress sigma of the stress weak point to be achieved by a trial calculation method n Approximating axial allowable compressive stress [ sigma ]]Obtain the explosion load safety limit value [ P ]]Finally, the safety limit value [ P ] of the explosive load of the liquid storage tank in the numerical calculation model is determined]And dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k to obtain a blasting vibration speed safety criterion [ PPV ] based on the stress control of the liquid storage tank]. The method can be operated without occupying a large amount of experimental equipment to carry out field test, is simple and feasible, saves cost, and is safe and reliable. The safety permission standard of the explosion vibration speed with the liquid storage tank as the protection object established by the invention perfects the existing explosion safety regulations,the method provides reliable blasting design basis and safety criteria for blasting construction of adjacent large-scale liquid storage tanks, and can guide blasting construction of adjacent areas of the existing large-scale liquid storage tanks.
Therefore, the invention has the advantages of simple and easy operation, reliable result and safety and economy, and provides visual blasting design basis and safety criterion for blasting construction of the adjacent large-scale liquid storage tank.
Drawings
FIG. 1 is a diagram of a numerical calculation model according to the present invention;
FIG. 2 is a graph of axial compressive stress along tank wall height for the numerical calculation model shown in FIG. 1;
fig. 3 is a graph of the axial compressive stress along the tank wall circumferential direction of the numerical calculation model shown in fig. 1.
Detailed Description
The invention is further described in connection with the accompanying drawings and detailed description, without limiting the scope thereof:
example 1
A method for determining blasting vibration safety criteria based on a stress standard of a liquid storage tank. The method in this embodiment comprises the following steps:
in a large oil storage base, 50 oil storage tanks of 10 ten thousand cubic meters exist, and 30 liquid storage tanks are built for expanding the oil storage base. When the foundation of a newly built liquid storage tank is blasted and excavated, the foundation has larger influence on the adjacent built liquid storage tank, and the influence of blasting disturbance in the oil storage base on the liquid storage tank is considered. Adjacent existing tanks and their foundations: the diameter of the tank body of the liquid storage tank is 80m; the tank body is 21.8m, SPV490Q steel is adopted, water is stored in the tank, the liquid level is 20m, and the foundation size is 140 x 120 x 20m in length x width x height.
Step 1, according to the APl650 standard in the United states, determining the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank by utilizing the structural parameters of the liquid storage tank and the liquid parameters in the tank:
when (when)And when the method is used, the following steps are carried out:
when (when)And when the method is used, the following steps are carried out:
in the formula (1) and the formula (2):
[ sigma ] represents allowable axial compressive stress of the tank wall of the liquid storage tank, and Pa;
gamma represents the density of the liquid in the liquid storage tank, and gamma=10 3 kg/m 3 ；
H represents the total height of the tank body of the liquid storage tank, h=21.8m;
d represents the tank diameter of the liquid storage tank, d=80m;
t s represents the thickness of the wall of the liquid storage tank, t s ＝0.032mm；
Calculated to obtainSelecting (2), obtaining the allowable compressive stress [ sigma ] of the tank wall of the liquid storage tank]，[σ]＝33.12×10 6 Pa。
And 2, establishing a numerical calculation model according to geometric parameters and material parameters of the liquid in the liquid storage tank, the foundation and the liquid in the liquid storage tank through LS_DYNA power finite element numerical simulation software as shown in figure 1.
Step 3, applying explosion load P on the foundation in the numerical calculation model through first trial calculation 1 The first trial calculation applies an explosive load P 1 ＝1.0×10 6 Pa, obtaining a distribution diagram of axial compressive stress of the liquid storage tank along the wall of the liquid storage tank in the numerical calculation model shown in FIG. 2 and a distribution diagram of axial compressive stress of the liquid storage tank along the wall of the liquid storage tank in the numerical calculation model shown in FIG. 3; as can be seen from the axial compressive stress distribution characteristics of the tank wall of the liquid storage tank shown in fig. 2 and 3, the stress weak points are positioned on the explosion-facing side of the tank wall of the liquid storage tank and 2m away from the tank bottomPlacing to obtain the explosive load P applied by the liquid storage tank in the numerical calculation model in the first trial calculation 1 ＝1.0×10 6 Axial compressive stress sigma of stress weak point at Pa 1 ＝18.71×10 6 Pa。
Step 4, applying explosion load P on the foundation in the numerical calculation model through second trial calculation 2 The second trial calculation applies an explosive load P 2 ＝P 1 +ΔP。
The Δp represents the increment of the explosive load applied by trial calculation of the explosive load in two adjacent times, Δp=0.5×10 6 Pa (the same applies below).
P 2 ＝1.0×10 6 Pa+0.5×10 6 Pa＝1.5×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the numerical calculation model in the second trial calculation 2 ＝1.5×10 6 Axial compressive stress sigma of stress weak point at Pa 2 ＝18.99×10 6 Pa。
In the numerical calculation model, the liquid storage tank applies explosion load P in the second trial calculation 2 Axial compressive stress sigma of stress weak point at time 2 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the third trial calculation 3 The third trial calculation applies an explosive load P 3 ＝P 2 +ΔP＝1.5×10 6 Pa+0.5×10 6 Pa＝2.0×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the numerical calculation model in the third trial calculation 3 ＝2.0×10 6 Axial compressive stress sigma of stress weak point at Pa 3 ＝19.25×10 6 Pa。
……。
The liquid storage tank applies explosion load P in 48 th trial calculation in the numerical calculation model 48 Axial compressive stress sigma of stress weak point at time 48 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Trial-computing the application of an explosive load P on the foundation of the numerical calculation model 49 th time 49 The 49 th trial calculation applies an explosive load P 49 ＝P 48 +ΔP＝24.5+0.5＝25×10 6 Pa, obtaining the explosion load applied by the liquid storage tank in the 49 th trial calculation in the numerical calculation modelP-carrying 49 ＝25×10 6 Axial compressive stress sigma of stress weak point at Pa 49 ＝33.02×10 6 Pa。
The liquid storage tank applies explosion load P in 49 th trial calculation in the numerical calculation model 49 Axial compressive stress sigma of stress weak point at time 49 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Trial-computing the application of an explosive load P on the foundation of the numerical calculation model at the 50 th time 50 The 50 th trial calculation applies an explosive load P 50 ＝P 49 +ΔP＝25+0.5＝25.5×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the 50 th trial calculation in the numerical calculation model 50 ＝25.5×10 6 Axial compressive stress sigma of stress weak point at Pa 50 ＝33.23×10 6 Pa。
In the numerical calculation model, the liquid storage tank applies explosion load P in the 50 th trial calculation 50 Axial compressive stress sigma of stress weak point at time 50 Is larger than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Then determine 49 th trial-calculation to apply the explosive load P 49 Safety limit value for explosive load [ P ]]The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the safety limit value [ P ] of the explosion load applied to the liquid storage tank in the numerical calculation model]＝25×10 6 The peak value PPV of the blasting vibration velocity of the foundation at Pa is 17cm/s in the horizontal direction and 3cm/s in the vertical direction.
And 5, dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k, and obtaining the blasting vibration safety criterion [ PPV ] based on the stress standard of the liquid storage tank, wherein the horizontal direction is 9.44cm/s and the vertical direction is 1.67cm/s according to the importance of engineering properties and the influence degree when disasters occur.
Example 2
A method for determining blasting vibration safety criteria based on a stress standard of a liquid storage tank. The method in this embodiment comprises the following steps:
and 10 liquid storage tanks of 3 ten thousand cubic meters are built on a certain low-temperature ethylene storage base, so as to explode mountain bodies in the base and expand the base. The mountain blasting excavation produces blasting disturbance to the liquid storage tank in the base, and the influence of the blasting disturbance in the oil storage base on the liquid storage tank needs to be considered. The liquid storage tank and the foundation thereof in this embodiment: the diameter of the tank body of the liquid storage tank is 42m, the tank body is 24m, and Q-235AF steel is adopted; the height of the liquid storage in the tank is 22m; the foundation dimensions length x width x height are 80 x 20m.
Step 1, according to the APl650 standard in the United states, determining the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank by utilizing the structural parameters of the liquid storage tank and the liquid parameters in the tank:
when (when)And when the method is used, the following steps are carried out:
when (when)And when the method is used, the following steps are carried out:
in the formula (1) and the formula (2):
[ sigma ] represents allowable axial compressive stress of the tank wall of the liquid storage tank, and Pa;
gamma represents the density of the liquid in the liquid storage tank, and gamma=910 kg/m 3 ；
H represents the total height of the tank body of the liquid storage tank, h=24m;
d represents the tank diameter of the liquid storage tank, d=42m;
t s represents the thickness of the wall of the liquid storage tank, t s ＝0.027mm；
Calculated to obtainSelecting (2), obtaining the allowable compressive stress [ sigma ] of the tank wall of the liquid storage tank]，[σ]＝53.23×10 6 Pa。
And 2, establishing a numerical calculation model through LS_DYNA power finite element numerical simulation software according to the geometric parameters and material parameters of the liquid in the liquid storage tank, the foundation and the liquid in the liquid storage tank.
Step 3, applying explosion load P on the foundation in the numerical calculation model through first trial calculation 1 The first trial calculation applies an explosive load P 1 ＝1.5×10 6 Pa, obtaining the distribution characteristics of the axial compressive stress of the liquid storage tank in the numerical calculation model along the height of the wall of the liquid storage tank and along the circumferential direction of the wall of the liquid storage tank; according to the axial compressive stress distribution characteristics of the tank wall of the liquid storage tank, the stress weak point is positioned at the position of the explosion-facing side of the tank wall of the liquid storage tank, which is 1.6m away from the tank bottom, so as to obtain the explosion load P applied by the liquid storage tank in the first trial calculation in the numerical calculation model 1 Axial compressive stress sigma of stress weak point at time 1 ＝25.13×10 6 Pa。
Step 4, applying explosion load P on the foundation in the numerical calculation model through second trial calculation 2 The second trial calculation applies an explosive load P 2 ＝P 1 +ΔP。
The Δp represents the increment of the explosive load applied by trial calculation of the explosive load in two adjacent times, Δp=0.3×10 6 Pa (the same applies below).
P 2 ＝1.5×10 6 Pa+0.3×10 6 Pa＝1.8×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the numerical calculation model in the second trial calculation 2 ＝1.8×10 6 Axial compressive stress sigma of stress weak point at Pa 2 ＝26.04×10 6 Pa。
In the numerical calculation model, the liquid storage tank applies explosion load P in the second trial calculation 2 Axial compressive stress sigma of stress weak point at time 2 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the third trial calculation 3 The third trial calculation applies an explosive load P 3 ＝P 2 +ΔP＝1.8×10 6 Pa+0.3×10 6 Pa＝2.1×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the numerical calculation model in the third trial calculation 3 ＝2.1×10 6 Axial compressive stress sigma of stress weak point at Pa 3 ＝26.98×10 6 Pa。
……。
The liquid storage tank applies explosive load P in 88 th trial calculation in the numerical calculation model 88 Axial compressive stress sigma of stress weak point at time 88 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the 89 th trial calculation on the foundation in the numerical calculation model 89 The 89 th trial calculation applies an explosive load P 89 ＝P 88 +ΔP＝27.6+0.3＝27.9×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the 89 th trial calculation in the numerical calculation model 89 ＝27.9×10 6 Axial compressive stress sigma of stress weak point at Pa 89 ＝53.12×10 6 Pa。
The liquid storage tank applies explosion load P in 89 th trial calculation in the numerical calculation model 89 Axial compressive stress sigma of stress weak point at time 89 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation of the numerical calculation model by trial calculation at the 90 th time 90 The 90 th trial calculation applies an explosive load P 90 ＝P 89 +ΔP＝27.9+0.3＝28.2×10 6 Pa, obtaining the explosion load P applied by the liquid storage tank in the 90 th trial calculation in the numerical calculation model 90 ＝28.2×10 6 Axial compressive stress sigma of stress weak point at Pa 90 ＝53.79×10 6 Pa。
In the numerical calculation model, the liquid storage tank applies explosion load P in the 90 th trial calculation 90 Axial compressive stress sigma of stress weak point at time 90 Is larger than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Then the 89 th trial calculation is determined to apply the explosive load P 89 Safety limit value for explosive load [ P ]]The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the safety limit value [ P ] of the explosion load applied to the liquid storage tank in the numerical calculation model]＝27.9×10 6 The peak value PPV of the blasting vibration velocity of the foundation at Pa is 22cm/s in the horizontal direction and 6.5cm/s in the vertical direction.
And 5, dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k, and obtaining the blasting vibration safety criterion [ PPV ] based on the stress standard of the liquid storage tank to be 14.67cm/s horizontally and 4.33cm/s vertically according to the importance of engineering properties and the influence degree when disasters occur.
Compared with the prior art, the invention has the following positive effects:
the invention determines the allowable compressive stress [ sigma ] of the axial direction of the tank wall according to the APl650 standard in the United states]Establishing a numerical calculation model by a numerical simulation method, and enabling the axial compressive stress sigma of the stress weak point to be achieved by a trial calculation method n Approximating axial allowable compressive stress [ sigma ]]Obtain the explosion load safety limit value [ P ]]Finally, the safety limit value [ P ] of the explosive load of the liquid storage tank in the numerical calculation model is determined]And dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k to obtain a blasting vibration speed safety criterion [ PPV ] based on the stress control of the liquid storage tank]. The method can be operated without occupying a large amount of experimental equipment to carry out field test, is simple and feasible, saves cost, and is safe and reliable. The safety permission standard of the explosion vibration speed, which is established by the invention and takes the liquid storage tank as a protection object, perfects the existing explosion safety regulations, provides reliable explosion design basis and safety criterion for the explosion construction of the adjacent large-scale liquid storage tank, and can guide the explosion construction of the adjacent area of the existing large-scale liquid storage tank.
Therefore, the invention has the advantages of simple and easy operation, reliable result and safety and economy, and provides visual blasting design basis and safety criterion for blasting construction of the adjacent large-scale liquid storage tank.

Claims (1)

1. A method for determining blasting vibration safety criteria based on a liquid storage tank stress standard is characterized by comprising the following steps:
step 1, according to the APl650 standard in the United states, determining the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank by utilizing the structural parameters of the liquid storage tank and the liquid parameters in the tank:
when (when)And when the method is used, the following steps are carried out:
when (when)And when the method is used, the following steps are carried out:
in the formula (1) and the formula (2):
[ sigma ] represents the allowable compression stress in the axial direction of the tank wall of the liquid storage tank, pa,
gamma represents the density of liquid in the liquid storage tank, kg/m 3 ，
H represents the total height of the tank body of the liquid storage tank, m,
d represents the diameter of the tank body of the liquid storage tank, m,
t s representing the thickness of the tank wall of the liquid storage tank, m;
step 2, establishing a numerical calculation model through LS_DYNA power finite element numerical simulation software according to geometric parameters and material parameters of the liquid in the liquid storage tank, the foundation and the liquid in the liquid storage tank;
step 3, applying explosion load P on the foundation in the numerical calculation model through first trial calculation 1 The first trial calculation applies an explosive load P 1 ＝(0.5～1.5)×10 6 Pa, namely obtaining the distribution characteristics of the axial compressive stress of the liquid storage tank in the numerical calculation model along the height of the wall of the liquid storage tank and along the circumferential direction of the wall of the liquid storage tank; determining the stress weak point of the liquid storage tank in the numerical calculation model, wherein the stress weak point is the position where the axial compressive stress of the wall of the liquid storage tank is the maximum value, namely the explosion load P applied by the liquid storage tank in the first trial calculation in the numerical calculation model 1 Axial compressive stress sigma of stress weak point at time 1 ；
Step 4, applying explosion load P on the foundation in the numerical calculation model through second trial calculation 2 The second trial calculation applies an explosive load P 2 ＝P 1 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the second trial calculation in the numerical calculation model 2 Axial compressive stress sigma of stress weak point at time 2 ；
If the explosive load P is applied to the liquid storage tank in the numerical calculation model in the second trial calculation 2 Axial compressive stress sigma of stress weak point at time 2 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the third trial calculation 3 The third trial calculation applies an explosive load P 3 ＝P 2 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the third trial calculation in the numerical calculation model 3 Axial compressive stress sigma of stress weak point at time 3 ；
……；
If the liquid storage tank applies explosive load P in the n-1 th trial calculation in the numerical calculation model n-1 Axial compressive stress sigma of stress weak point at time n-1 Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosive load P on the foundation in the numerical calculation model for the nth trial calculation n The nth trial calculation applies an explosive load P n ＝P n-1 +ΔP, i.e. the explosion load P applied by the liquid storage tank in the n-th trial calculation in the numerical calculation model n Axial compressive stress sigma of stress weak point at time n ；
If the liquid storage tank applies explosive load P in the nth trial calculation in the numerical calculation model n Axial compressive stress sigma of stress weak point at time n Is smaller than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Applying an explosion load P on the n+1st trial calculation on the foundation in the numerical calculation model n+1 The n+1th trial calculation applies the explosive load P n+1 ＝P n +ΔP, i.e. the explosion load P applied by the liquid storage tank in the n+1st trial calculation in the numerical calculation model n+1 Axial compressive stress sigma of stress weak point at time n+1 ；
The delta P represents the increment of the explosion load of the trial-and-computation applied explosion load of two adjacent times, and delta P= (0.2-0.5) multiplied by 10 6 Pa；
If the liquid storage tank applies explosive load P in n+1st trial calculation in the numerical calculation model n+1 Axial compressive stress sigma of stress weak point at time n+1 Is larger than the allowable axial compressive stress [ sigma ] of the tank wall of the liquid storage tank]Then the n-th trial calculation of the applied explosive load P is determined n A safety limit value P for the explosive load; then obtaining a blasting vibration speed peak value PPV of the foundation when the explosion load safety limit value P is applied to the liquid storage tank in the numerical calculation model;
and 5, dividing the blasting vibration speed peak value PPV of the foundation by an importance correction coefficient k, wherein the importance correction coefficient k is 1.2-2, and thus the blasting vibration safety criterion based on the stress standard of the liquid storage tank is obtained.
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