CN116485209B - Method for evaluating the safety and stability of a marine structure - Google Patents
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Abstract
The application relates to a method for evaluating the safety and stability of a marine structure, comprising: judging and acquiring the condition of a seabed foundation soil body and the self condition of a structure of a marine building, and arranging a plurality of first monitoring points and second monitoring points in the seabed foundation soil body and the marine building respectively; acquiring data fed back by a plurality of first monitoring points and second monitoring points, and respectively establishing a seabed soil liquefaction evaluation index and a dynamic response evaluation index of a marine structure according to the fed back data; calculating the duty ratio of the importance degree of the seabed soil liquefaction evaluation index and the duty ratio of the importance degree of the dynamic response evaluation index of the marine structure; and calculating the safety stability of the marine building according to the duty ratio of the importance degree of the seabed soil liquefaction evaluation index and the marine building structure dynamic response evaluation index. Through the mode, the current and future safety and stability conditions of the structure of the marine building can be accurately judged and predicted, and safety accidents can be effectively prevented and avoided.
Description
[ field of technology ]
The application relates to a method for evaluating the safety stability of a marine building, and belongs to the technical field of structural safety stability evaluation.
[ background Art ]
The main objects involved in the safety and stability of the marine structure comprise external load, the marine structure and the seabed soil body. At different external load levels, the marine structure and the seabed soil mass will respond to different degrees. The seabed foundation soil body is caused to respond under the action of wave load, the gradual rise of the excess pore water pressure and the gradual reduction of the soil body effective stress are shown, and finally the seabed foundation is caused to slide, shear and damage by liquefaction, so that the safety and stability of the marine structure are affected. Meanwhile, corresponding vibration displacement and vibration speed can be generated at each point of the structure under the action of loads such as waves, sea wind and ocean currents, and the dynamic response of the structure under the complex load coupling effect can be known by testing the vibration displacement and vibration speed of the measuring points of the structure under the action of the running load.
In the prior art, the evaluation method for structural stability is mainly a method for judging the ultimate bearing capacity, and when the external force applied to the structure exceeds the ultimate bearing capacity, the structural stability requirement is judged not to be met. The corresponding ultimate bearing capacity judgment criteria comprise the following three types:
criterion i: the load corresponding to the slope of the P-S (load-displacement) curve close to zero is taken as the ultimate bearing capacity;
criterion II: the load corresponding to the P-S (load-displacement) curve with obvious inflection points is taken as the ultimate bearing capacity;
criterion III: and taking the load corresponding to the maximum allowable deflection of the structure as the ultimate bearing capacity.
However, the above method is a method for judging structural instability in extreme cases. In real life, most structures do not have obvious phenomenon of reaching the ultimate bearing capacity in the operation stage, and even instability is caused by other factors when the ultimate bearing capacity is not reached. Therefore, the method in the prior art is only suitable for simulating extreme conditions to judge the safe instability condition of the structure, and has a certain error with the actual situation.
Accordingly, there is a need for an improvement over the prior art to overcome the deficiencies described in the prior art.
[ application ]
The application aims to provide a method for evaluating the safety stability of a marine structure, so as to improve the accuracy of an evaluation result.
The application aims at realizing the following technical scheme: a method for assessing marine structure safety stability, comprising:
judging and acquiring the condition of a seabed foundation soil body and the self condition of a structure of a marine building, and respectively arranging a plurality of first monitoring points and second monitoring points in the seabed foundation soil body and the marine building according to the acquired conditions;
acquiring data fed back by a plurality of first monitoring points and a plurality of second monitoring points, and respectively establishing a seabed soil liquefaction evaluation index and a dynamic response evaluation index of a marine structure according to the fed back data;
the ratio of the importance degree of the seabed soil liquefaction evaluation index and the ratio of the importance degree of the dynamic response evaluation index of the marine structure are calculated respectively;
calculating the safety stability of the marine structure according to the ratio of the importance degree of the seabed soil liquefaction evaluation index and the marine structure dynamic response evaluation index, wherein the safety stability is calculated in the following manner:
wherein m is the number of first monitoring points of pore water pressure in the seabed foundation soil body, n is the number of second monitoring points of structural vibration response of the marine building, X is the seabed soil body liquefaction evaluation index, Y is the marine building structure dynamic response evaluation index, omega X The ratio of the importance degree of the seabed soil liquefaction evaluation index is calculated; omega Y And the ratio of the importance degree of the dynamic response evaluation index of the marine building structure is calculated.
In one embodiment, the establishing of the seabed soil liquefaction evaluation index specifically includes:
obtaining k first monitoring data of a plurality of first monitoring points and the change of total soil pressure in a first set time, wherein the detection data at each moment in the first set time is U i (i=1, 2, …, k), the total soil pressure at each time instant in the first set time being σ i (i＝1,2,…,k)；
Acquiring hyperstatic pore water pressure caused by wave load action of the seabed foundation soil body based on the acquired detection data and the change of total soil pressure, wherein the hyperstatic pore water pressure comprises accumulated residual pore water pressure and circulating oscillation pore water pressure;
the maximum value of the oscillating pore water pressure in the first set time is recorded as U max The minimum value is recorded as U min Taking the calculated average value as the oscillation pore water pressure characteristic value U in the first set time 1 The average value U 1 The calculation formula of (2) is as follows:
U 1 ＝(U max -U min )/2
the residual pore water at the end time within the first set time is addedThe pressure value is taken as a characteristic value U of the residual pore water pressure in the first set time 2 ；
According to the characteristic value U of the oscillating pore water pressure 1 And the residual pore water pressure characteristic value U 2 And (3) comparing and establishing the seabed soil liquefaction evaluation index.
In one embodiment, the establishing the seabed soil liquefaction evaluation index according to the comparison of the oscillation pore water pressure characteristic value and the residual pore water pressure characteristic value specifically includes:
when the oscillation pore water pressure characteristic value U 1 Less than or equal to the residual pore water pressure characteristic value U 2 And indicating that the hyperstatic pore water pressure is not increased within the first set time, wherein the seabed foundation soil body is not liquefied, and the seabed soil body liquefaction evaluation index meets the following conditions:
X＝0；
when the oscillation pore water pressure characteristic value U 1 Is greater than the characteristic value U of the residual pore water pressure 2 Indicating that the hyperstatic pore water pressure of the first set time is in a continuously rising state, and combining the pore water pressure U at each moment in the first set time i And total earth pressure sigma i Calculating the seabed soil liquefaction evaluation index:
X＝max(X i )＝max(U i /σ i ')＝max[U i /(σ i -U i )]
where i=1, 2, …, k.
In one embodiment, the establishing of the dynamic response evaluation index of the marine structure specifically includes:
acquiring second monitoring data of a plurality of second monitoring points on the marine structure within a second set time, wherein the second monitoring data comprise vibration displacement data and vibration speed data under the action of an operating load; wherein the vibration displacement data and the vibration velocity data include a positive value and a negative value, the positive value being a recorded value when the vehicle is away from the sea side, the negative value being a recorded value when the vehicle is close to the sea side;
calculating the average displacement D and the average speed V within the second set time and the maximum displacement D along the external load acting first side 1 Maximum speed V 1 Maximum displacement D of the second side along the external load 2 Maximum speed V 2 ；
And judging whether the structure of the marine building is in a safe and stable state based on the product of the average displacement D and the average speed V so as to establish a dynamic response evaluation index of the structure of the marine building.
In one embodiment, the determining whether the structure of the marine structure is in a safe and stable state based on the product of the average displacement D and the average velocity V, so as to establish the dynamic response evaluation index of the marine structure specifically includes:
when the product of the average displacement D and the average speed V is less than or equal to 0, the structure of the marine building is in a safe and stable state, and the dynamic response evaluation index of the marine building structure meets the following conditions:
Y＝0；
when the product of the average displacement D and the average speed V is larger than 0, and the average displacement D is larger than 0 and the average speed V is larger than 0, the dynamic response evaluation index of the marine building structure meets the following conditions:
when the product of the average displacement D and the average speed V is larger than 0, the average displacement D is smaller than 0, and the average speed V is smaller than 0, the dynamic response evaluation index of the marine building structure meets the following conditions:
in one embodiment, the calculation formula of the duty ratio of the importance degree of the seabed soil liquefaction evaluation index is as follows:
in one embodiment, the calculation formula of the duty ratio of the importance degree of the dynamic response evaluation index of the marine structure is as follows:
in one embodiment, the method further comprises:
when the safety stability of the marine building is greater than 1, the marine building does not meet the safety and stability requirements;
when the safety stability of the marine building is less than or equal to 1, the marine building meets the requirement of safety and stability.
In one embodiment, the method further comprises:
the setting of the number of the first monitoring points and the second monitoring points specifically comprises:
when the condition of the seabed foundation soil mass is better than the condition of the structure of the marine building, the number of the first monitoring points is smaller than that of the second monitoring points;
when the condition of the structure of the marine building is better than the condition of the seabed foundation soil mass, the number of the first monitoring points is larger than that of the second monitoring points;
when the structure of the marine building and/or the condition of the seabed foundation soil body are unknown, the number of the first monitoring points is equal to the number of the second monitoring points.
Compared with the prior art, the application has the following beneficial effects: according to the application, a plurality of first monitoring points and second monitoring points are respectively arranged in a seabed foundation soil body and a marine structure to obtain corresponding data, a seabed soil body liquefaction evaluation index and a marine structure dynamic corresponding evaluation index are respectively established according to the data fed back by the first monitoring points and the second monitoring points, and the ratio of the two indexes is calculated to finally obtain the safety and stability of the marine structure; and the established evaluation indexes can accurately and specifically explain the reason that the structure is likely to be unstable, so that safety accidents are effectively prevented and avoided.
[ description of the drawings ]
Fig. 1 is a flow chart of a method of the present application for assessing the safety and stability of a marine structure.
Fig. 2 is another flow chart of the method of the present application for assessing the safety and stability of a marine structure.
FIG. 3 is a graph showing the pore water pressure variation and related calculated parameters during a first set time according to the present application.
Fig. 4 is a schematic representation of vibration displacement and vibration velocity sign values of the present application.
[ detailed description ] of the application
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1 to 4, the method for evaluating the safety stability of a marine structure according to the present application can comprehensively evaluate the safety stability of a marine structure, thereby effectively preventing and avoiding the occurrence of safety accidents.
The calculation mode for evaluating the safety stability of the marine structure is as follows:
wherein m is the number of first monitoring points of pore water pressure in the seabed foundation soil body, n is the number of second monitoring points of structural vibration response of the marine building, X is seabed soil body liquefaction evaluation index, Y is marine building structure dynamic response evaluation index, omega X The ratio of importance degree of the liquefaction evaluation index of the seabed soil body; omega Y The ratio of the importance degree of the dynamic response evaluation index of the marine building structure is calculated.
Specifically, the method for evaluating the safety stability of the marine structure specifically comprises the following steps:
step 101: judging and acquiring the condition of the seabed foundation soil mass and the self condition of the structure of the marine structure, and respectively arranging a plurality of first monitoring points and second monitoring points in the seabed foundation soil mass and the marine structure according to the acquired conditions.
The setting of the number of the first monitoring points and the second monitoring points specifically comprises the following steps:
when the condition of the seabed foundation soil mass is better than the condition of the structure of the marine building, the number of the first monitoring points is smaller than that of the second monitoring points. That is, in this embodiment, when the seabed foundation soil is good and the structure of the marine structure is poor, the dynamic response of the structure of the marine structure is mainly represented under the continuous external load, so that the key part is broken or greatly displaced and the use requirement is not satisfied, at this time, the safety and stability problem of the marine structure is mainly evaluated according to the corresponding condition of the structure of the marine structure, and therefore, the number of the first monitoring points needs to be smaller than the number of the second monitoring points.
When the condition of the structure of the marine building is better than the condition of the seabed foundation soil mass, the number of the first monitoring points is smaller than that of the second monitoring points. That is, in this embodiment, when the seabed foundation soil is poor and the marine structure is good, the safety problem caused by the liquefaction of the seabed soil is mainly represented under the action of the continuous external load, and at this time, the safety and stability problem of the marine structure is mainly evaluated by the liquefaction degree of the seabed soil, so the number of the first monitoring points needs to be greater than the number of the second monitoring points.
When the structure of the marine building and/or the condition of the seabed foundation soil body are unknown, the number of the first monitoring points is equal to that of the second monitoring points. That is, in this embodiment, when either the structure itself of the marine structure or the condition of the soil body of the seabed foundation is unknown, the evaluation should be performed according to the same importance degree of the structure itself and the condition of the soil body of the seabed foundation, and at the same time, monitoring points should be increased as much as possible to ensure the accuracy of the result.
Step 102: and acquiring data fed back by the first monitoring points and the second monitoring points, and respectively establishing a seabed soil liquefaction evaluation index and a dynamic response evaluation index of the marine structure according to the fed back data.
The establishment of the seabed soil liquefaction evaluation index specifically comprises the following steps:
obtaining k first monitoring data of a plurality of first monitoring points and the change of total soil pressure in a first set time, wherein the detection data at each moment in the first set time is U i (i=1, 2, …, k), the total soil pressure at each moment in the first set time being σ i (i＝1,2,…,k)；
Acquiring hyperstatic pore water pressure caused by wave load action of a seabed foundation soil body based on the acquired detection data and the change of total soil pressure, wherein the hyperstatic pore water pressure comprises accumulated residual pore water pressure and circulating oscillation pore water pressure;
the maximum value of the oscillating pore water pressure in the first set time is recorded as U max The minimum value is recorded as U min Taking the calculated average value as an oscillation pore water pressure characteristic value U in a first set time 1 Average value U 1 The calculation formula of (2) is as follows:
U 1 ＝(U max -U min )/2
taking the residual pore water pressure value at the tail moment in the first set time as a characteristic value U of the residual pore water pressure in the first set time 2 ；
According to the characteristic value U of the oscillating pore water pressure 1 And a residual pore water pressure characteristic value U 2 And (3) comparing and establishing a seabed soil liquefaction evaluation index.
The method for establishing the seabed soil liquefaction evaluation index specifically comprises the following steps of:
when the characteristic value U of the oscillating pore water pressure 1 Less than or equal to the characteristic value U of the residual pore water pressure 2 The method shows that the hyperstatic pore water pressure in the first set time is not increased, the seabed foundation soil body is not liquefied, and the seabed soil body liquefaction evaluation index meets the following requirements:
X＝0；
when the characteristic value U of the oscillating pore water pressure 1 Is greater than the characteristic value U of the residual pore water pressure 2 Indicating that the hyperstatic pore water pressure of the first set time is in a continuously rising state, and combining the pore water pressure U at each moment in the first set time i And total earth pressure sigma i Calculating the liquefaction evaluation index of the seabed soil mass:
X＝max(X i )＝max(U i /σ i ')＝max[U i /(σ i -U i )]
where i=1, 2, …, k.
The establishment of the dynamic response evaluation index of the marine structure specifically comprises the following steps:
acquiring second monitoring data of a plurality of second monitoring points on the marine structure within a second set time, wherein the second monitoring data comprise vibration displacement data and vibration speed data under the action of an operating load; the vibration displacement data and the vibration speed data comprise positive values and negative values, wherein the positive values are recorded values when the vibration displacement data and the vibration speed data are far away from the sea, and the negative values are recorded values when the vibration displacement data and the vibration speed data are close to the sea;
calculating the average displacement D and the average speed V within the second set time and the maximum displacement D along the first side of the external load 1 Maximum speed V 1 Maximum displacement D of the second side along the external load 2 Maximum speed V 2 ；
Based on the product of the average displacement D and the average speed V, judging whether the structure of the marine building is in a safe and stable state or not so as to establish a dynamic response evaluation index of the structure of the marine building.
Based on the product of the average displacement D and the average speed V, judging whether the structure of the marine building is in a safe and stable state or not so as to establish a dynamic response evaluation index of the structure of the marine building specifically comprises:
when the product of the average displacement D and the average speed V is less than or equal to 0, the structure of the marine structure is in a safe and stable state, and the dynamic response evaluation index of the marine structure meets the following requirements:
Y＝0；
when the product of the average displacement D and the average speed V is larger than 0, and the average displacement D is larger than 0 and the average speed V is larger than 0, the dynamic response evaluation index of the marine structure meets the following conditions:
when the product of the average displacement D and the average speed V is larger than 0, the average displacement D is smaller than 0, and the average speed V is smaller than 0, the dynamic response evaluation index of the marine structure meets the following conditions:
step 103: and respectively calculating the duty ratio of the importance degree of the seabed soil liquefaction evaluation index and the duty ratio of the importance degree of the dynamic response evaluation index of the marine structure.
The calculation formula of the duty ratio of the importance degree of the seabed soil liquefaction evaluation index is as follows:
the calculation formula of the duty ratio of the importance degree of the dynamic response evaluation index of the marine structure is as follows:
step 104: and calculating the safety stability of the marine building according to the duty ratio of the importance degree of the seabed soil liquefaction evaluation index and the marine building structure dynamic response evaluation index.
When the safety stability of the marine building is more than 1, the marine building does not meet the requirements of safety and stability; when the safety stability of the marine building is less than or equal to 1, the marine building meets the requirement of safety and stability.
It should be noted that the first setting time and the second setting time may be equal or unequal, and the present application is not limited specifically. For example, the first set time is half a month, and the second set time is one year, etc. Wherein the second set time should be not less than one year.
A specific embodiment will be described in detail below.
A marine structure with a reinforced concrete structure is installed in a certain muddy soft soil sea area. At this time, the condition of the seabed foundation soil is poor, and the structure of the marine building is relatively good, namely the pore water pressure measurement point m installed in the seabed foundation soil is larger than the dynamic response measurement point n installed on the structure. Assuming that m=3 and n=2, data for monitoring a one-year period (first set time) is recorded.
The results of statistical analysis of the parameters related to the pore water pressure measuring points installed in the seabed foundation soil mass are shown in the following table:
| measuring point number | U max /kPa | U min /kPa | U 2 /kPa |
| m 1 | 20 | -12 | 13 |
| m 2 | 24 | -10 | 17 |
| m 3 | 28 | -10 | 15 |
Firstly, calculating a measuring point m by the formula for calculating the oscillating air gap water pressure 1 、m 2 And m 3 Corresponding oscillation pore water pressure characteristic value U 1 16, 17 and 19 respectively. It can be seen from the table that for the measurement point m 2 Satisfy U 1 ≤U 2 Its correspondent seabed soil body liquefying index X 2 =0. For measuring point m 1 And m 3 Satisfy U 1 ＞U 2 At this time, the pore water pressure U at each moment in the period is further combined i And total earth pressure sigma i And judging. The corresponding seabed soil liquefaction indexes are respectively X through correlation calculation 1 ＝0.53，X 3 ＝0.81。
The results of the statistical analysis of the relevant parameters of the dynamic response measuring points installed on the structure are shown in the following table:
| measuring point number | D/mm | V/(mm/s) | D1/mm | V1/(mm/s) | D2/mm | V2/(mm/s) |
| n 1 | 0 | -0.11172 | 0.00023 | 0.04299 | -0.00031 | -0.27165 |
| n 2 | 0.00003 | 0.21759 | 0.00589 | 2.43914 | -0.00585 | -2.15759 |
Wherein for the measuring point n 1 Satisfy D.V<0, the corresponding structure dynamic response index is Y 1 =0. For measuring point n 2 Satisfies D.V0, wherein D is more than 0, V is more than 0, and the structural dynamic response index Y is further calculated at the moment 2 ＝0.89。
Calculating the duty ratio omega of the importance degree of the seabed soil liquefaction evaluation index X by combining the calculation results X =0.69, the duty ratio ω of the marine structure dynamic response evaluation index Y importance degree Y ＝0.31。
Substituting the settlement result into a formula to obtain the safety and stability evaluation index S=0.45 of the marine structure, wherein S is smaller than 1, so that the marine structure is in a safety and stability state.
To sum up: according to the application, a plurality of first monitoring points and second monitoring points are respectively arranged in a seabed foundation soil body and a marine structure to obtain corresponding data, a seabed soil body liquefaction evaluation index and a marine structure dynamic corresponding evaluation index are respectively established according to the data fed back by the first monitoring points and the second monitoring points, and the ratio of the two indexes is calculated to finally obtain the safety and stability of the marine structure; and the established evaluation indexes can accurately and specifically explain the reason that the structure is likely to be unstable, so that safety accidents are effectively prevented and avoided.
The foregoing is merely one specific embodiment of the application, and any modifications made in light of the above teachings are intended to fall within the scope of the application.
Claims (9)
1. A method for assessing the safety and stability of a marine structure, comprising:
judging and acquiring the condition of a seabed foundation soil body and the self condition of a structure of a marine building, and respectively arranging a plurality of first monitoring points and second monitoring points in the seabed foundation soil body and the marine building according to the acquired conditions;
acquiring data fed back by a plurality of first monitoring points and a plurality of second monitoring points, and respectively establishing a seabed soil liquefaction evaluation index and a dynamic response evaluation index of a marine structure according to the fed back data;
the ratio of the importance degree of the seabed soil liquefaction evaluation index and the ratio of the importance degree of the dynamic response evaluation index of the marine structure are calculated respectively;
calculating the safety stability of the marine structure according to the ratio of the importance degree of the seabed soil liquefaction evaluation index and the marine structure dynamic response evaluation index, wherein the safety stability is calculated in the following manner:
wherein m is the number of first monitoring points of pore water pressure in the seabed foundation soil body, n is the number of second monitoring points of structural vibration response of the marine building, X is the seabed soil body liquefaction evaluation index, Y is the marine building structure dynamic response evaluation index, omega X The ratio of the importance degree of the seabed soil liquefaction evaluation index is calculated; omega Y And the ratio of the importance degree of the dynamic response evaluation index of the marine building structure is calculated.
2. The method of claim 1, wherein the establishing of the seabed soil liquefaction evaluation index specifically comprises:
acquiring a plurality of first time within a first set timeK first monitoring data of the monitoring points and the change of the total soil pressure, wherein the detection data at each moment in the first set time is U i (i=1, 2, …, k), the total soil pressure at each time instant in the first set time being σ i (i＝1,2,…,k)；
Acquiring hyperstatic pore water pressure caused by wave load action of the seabed foundation soil body based on the acquired detection data and the change of total soil pressure, wherein the hyperstatic pore water pressure comprises accumulated residual pore water pressure and circulating oscillation pore water pressure;
the maximum value of the oscillating pore water pressure in the first set time is recorded as U max The minimum value is recorded as U min Taking the calculated average value as the oscillation pore water pressure characteristic value U in the first set time 1 The average value U 1 The calculation formula of (2) is as follows:
U 1 ＝(U max -U min )/2
taking the residual pore water pressure value at the end moment in the first set time as a characteristic value U of the residual pore water pressure in the first set time 2 ；
According to the characteristic value U of the oscillating pore water pressure 1 And the residual pore water pressure characteristic value U 2 And (3) comparing and establishing the seabed soil liquefaction evaluation index.
3. The method according to claim 2, wherein the establishing the seabed soil liquefaction evaluation index according to the comparison of the oscillation pore water pressure characteristic value and the residual pore water pressure characteristic value specifically comprises:
when the oscillation pore water pressure characteristic value U 1 Less than or equal to the residual pore water pressure characteristic value U 2 And indicating that the hyperstatic pore water pressure is not increased within the first set time, wherein the seabed foundation soil body is not liquefied, and the seabed soil body liquefaction evaluation index meets the following conditions:
X＝0；
when the oscillation pore water pressure characteristic value U 1 Is greater than the characteristic value U of the residual pore water pressure 2 Indicating that the hyperstatic pore water pressure of the first set time is in a continuously rising state, and combining the pore water pressure U at each moment in the first set time i And total earth pressure sigma i Calculating the seabed soil liquefaction evaluation index:
X＝max(X i )＝max(U i /σ i ')＝max[U i /(σ i -U i )]
where i=1, 2, …, k.
4. The method of claim 1, wherein the establishing of the dynamic response evaluation index of the marine structure specifically comprises:
acquiring second monitoring data of a plurality of second monitoring points on the marine structure within a second set time, wherein the second monitoring data comprise vibration displacement data and vibration speed data under the action of an operating load; wherein the vibration displacement data and the vibration velocity data include a positive value and a negative value, the positive value being a recorded value when the vehicle is away from the sea side, the negative value being a recorded value when the vehicle is close to the sea side;
calculating the average displacement D and the average speed V within the second set time and the maximum displacement D along the external load acting first side 1 Maximum speed V 1 Maximum displacement D of the second side along the external load 2 Maximum speed V 2 ；
And judging whether the structure of the marine building is in a safe and stable state based on the product of the average displacement D and the average speed V so as to establish a dynamic response evaluation index of the structure of the marine building.
5. The method of claim 4, wherein determining whether the marine structure is in a safe and stable state based on the product of the average displacement D and the average velocity V to establish the marine structure dynamic response evaluation index specifically comprises:
when the product of the average displacement D and the average speed V is less than or equal to 0, the structure of the marine building is in a safe and stable state, and the dynamic response evaluation index of the marine building structure meets the following conditions:
Y＝0；
when the product of the average displacement D and the average speed V is larger than 0, and the average displacement D is larger than 0 and the average speed V is larger than 0, the dynamic response evaluation index of the marine building structure meets the following conditions:
when the product of the average displacement D and the average speed V is larger than 0, the average displacement D is smaller than 0, and the average speed V is smaller than 0, the dynamic response evaluation index of the marine building structure meets the following conditions:
6. the method according to any one of claims 1 to 5, wherein the calculation formula of the ratio of the importance level of the seabed soil liquefaction evaluation index is as follows:
7. the method according to any one of claims 1 to 5, wherein the calculation formula of the duty ratio of the dynamic response evaluation index importance degree of the marine structure is as follows:
8. the method of any one of claims 1 to 5, wherein the method further comprises:
when the safety stability of the marine building is greater than 1, the marine building does not meet the safety and stability requirements;
when the safety stability of the marine building is less than or equal to 1, the marine building meets the requirement of safety and stability.
9. The method of any one of claims 1 to 5, wherein the method further comprises:
the setting of the number of the first monitoring points and the second monitoring points specifically comprises:
when the condition of the seabed foundation soil mass is better than the condition of the structure of the marine building, the number of the first monitoring points is smaller than that of the second monitoring points;
when the condition of the structure of the marine building is better than the condition of the seabed foundation soil mass, the number of the first monitoring points is larger than that of the second monitoring points;
when the structure of the marine building and/or the condition of the seabed foundation soil body are unknown, the number of the first monitoring points is equal to the number of the second monitoring points.
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