CN108491646A - Method for identifying vibration damage caused by blasting when tunnel passes through important building in short distance - Google Patents
Method for identifying vibration damage caused by blasting when tunnel passes through important building in short distance Download PDFInfo
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- 238000005422 blasting Methods 0.000 title claims abstract description 46
- 230000006378 damage Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 230000004044 response Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 14
- 238000005336 cracking Methods 0.000 claims description 13
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention discloses a method for identifying vibration damage caused by blasting of a tunnel passing through an important building in a short distance, which comprises the following steps: selecting a building to be monitored to carry out blasting vibration test, obtaining peak vibration speed and vibration dominant frequency and evaluating the vibration safety of the building; carrying out OMA modal test and identifying modal parameters of the building; establishing an initial finite element model and solving modal parameters of the initial finite element model; correcting the finite element model by adopting a model correction method; taking the modified building structure finite element model as an object, and exploring to obtain a member which is possibly damaged under blasting vibration; inputting measured blasting seismic waves, and researching the dynamic response of the building under the action of the blasting seismic waves to obtain a possibly damaged component; and comparing the condition of the cracked member of the building after the site blasting vibration with the result in the numerical calculation, and if the condition is consistent with the result in the numerical calculation, determining that the crack is caused by the blasting vibration. The invention has the advantages of ingenious conception, simple and easy identification method, environment-friendly application and wide market prospect.
Description
Technical field：
The invention belongs to Tunnel Blasting technical fields, and in particular to a kind of tunnel low coverage is passed through important building explosion and caused
The identification method of vibration damage can accurately make blasting vibration when in tunnel, low coverage passing through building or structures are constructed
It is identified at the damage of building.
Background technology：
In section and rail traffic construction process are imported and exported in the city of high-speed railway, highway, inevitably encounter
The complex environment tunnel under the intensive building of city is worn under a large amount of low coverages.When rocky tunnel uses drill bursting construction, Tunnel Blasting
It necessarily will produce attenuation of seismic waves.When the peak value vibration velocity of attenuation of seismic waves is more than vibration safety standard or the explosion of building
The dominant frequency of seismic wave is likely to cause building that different degrees of be damaged occurs close to the intrinsic frequency of building.Tunnel is quick-fried
The frequent disturbance of broken vibration, may aggravate the generation damaged above, cause building accumulated damage and destruction, influence locality
The normal work of resident and life.If local common people's claim, may cause civil disputation even to be stopped work, cause unit in charge of construction
The property loss of conflict and both sides between the local common people.
Currently, there are no ripe and unified standard of perfection, foundation and methods for the identification of blasting vibration lower room crack and damage.
The factor of damaged house is varied, and vibration wave is external condition, and the kinetic characteristics of building are in it in item when vibrated
Part, it is closely related with the structure type in house, the factors such as actual characteristic of construction material, the damage in house is judged by single method
Bad is to be caused to be the presence of certain difficulty by blasting vibration.Construction site is disputed over trifles more frequent occurrence and dispute, it is difficult to judge
Whether the cracking of building is since blasting vibration causes.Therefore, the present invention, which designs, proposes that a kind of tunnel low coverage passes through important build
The identification method that object explosion causes vibration damage is built, can accurately calculate and identifies whether the damage of building is by blasting vibration
Cause.
Invention content：
It is an object of the invention to overcome defect of the existing technology, a kind of tunnel low coverage of design offer is provided and passes through weight
It wants structure demolition to cause the identification method of vibration damage, the damage of building is accurately calculated and reflected by this method
It is fixed.
To achieve the goals above, a kind of tunnel low coverage of the present invention passes through important building explosion and causes to vibrate damage
The identification method specific steps of wound carry out as follows：
S1, selection need the building that emphasis monitors, the cloth on the ground nearest apart from Tunnel Blasting center on building
If Explosive Vibrating Velocity monitoring point, and three-dimensional velocity sensor is connected using blasting vibration instrument, blasting vibration is tested, explosion peak value is read
Vibration velocity and master oscillator frequenc；
S2, basis《Shotfiring safety regulation》The middle safe permitting deformation of vibration velocity carries out the vibration safety evaluation of building, is divided into
2 kinds of situations below：
a：If the vibration peak vibration velocity of test architecture object, which is less than the safety under respective frequencies, allows vibration velocity, it is possible to determine that tunnel
Blasting vibration does not cause the damage of building；
b：If the vibration peak vibration velocity of test architecture object, which is more than the safety under respective frequencies, allows vibration velocity, cannot judge completely
Tunnel Blasting vibration centainly causes the damage of building, because《Shotfiring safety regulation》Specified in allow the vibration velocity to be usually safely
There are safety stock, need that further analysis is taken to determine：I.e. by establishing the real structure model of building, to building
It builds object and carries out the dynamic response under blasting vibration and damage feature research, obtain the component that may be damaged, and build with scene
The component for building object fact damaged cracking is compared, to realize the Damage identification to building under blasting vibration；
S3, the Operational Modal Analysis under the excitation of natural environment load are carried out to the building of selection
(OMA) modal test, using Enhanced Frequency Domain Decomposition Method (EFDD) or
Stochastic subspace identification Method (SSI) modal identification method identifies the mode ginseng of building
Number, including intrinsic frequency, the vibration shape and damping；
S4, the prospective design data for obtaining building, and measure building to obtain the outwardly and inwardly size of building,
The initial finite element model of structure of building is established according to measurement data, material parameter can use empirical value；
S5, the modal parameter for solving structural finite element model calculate exponent number and are kept with the exponent number that OMA modal tests identify
Unanimously；
The modal parameter that S6, comparison structure finite element model and OMA modal tests obtain, analysis relative error, Modal
Assurance Criterion (MAC) values and the reason of cause error；It is surveyed since the geometric dimension of building is that scene is practical
Amount, data are accurate, and masonry and concrete material increase with the time, and physics, mechanical property can be gradually reduced, the material of use
Empirical parameter value be difficult that reflection is true, therefore needs to repair the masonry and concrete material parameter of measured building
Just；
S7, using model modification method, object function is established, by correcting material parameter, boundary condition etc. to finite element
Model is modified so that the structural finite element model of foundation can meet the real features of building；Wherein object function is adopted
Use the quadratic sum of FEM calculation frequency and practical frequency relative error as object function because its amendment is more efficient, repaiies
Plus effect becomes apparent, such as formula (1)：
In formula：MBHS represents object function, feiTo test obtained frequency, faiThe frequency obtained for finite element analysis；
S8, using the revised fabric structure finite element models of S7 as object, probe into and show that building shakes under blasting vibration
The dynamic Local Members that may more damage strongly include balcony, filling wall, parapet；At stress concentration position, including
There are an angle, window angle；Further include having at concrete floor and the interface of brick wall contact at the position of rigidity mutation；
S9, using revised building finite element model as object, input the attenuation of seismic waves of actual measurement, study explosion earthquake
The dynamic response for the Local Members that the strong possibility of the lower vibration of building of wave effect is damaged, obtains the office that may be damaged
Portion's component；
S10, the Local Members that may be damaged, the structure with construction cracking after live blasting vibration will be obtained in numerical computations
Part situation is compared, if consistent with numerical result, then it is assumed that the crack is caused by blasting vibration；Conversely, then recognizing
Not caused by blasting vibration for the crack, but due to caused by the other reasons including settlement of foundation, temperature stress
House crack.
The identification of vibration damage accurately can be carried out to construction cracking region using shock sensor, while passing through stone
Cream can further increase the accuracy of appraising datum as connection medium；The initial finite element of structure by establishing building
The model and mode of modal parameter for obtaining finite element model obtains all parameters of identification building, and passes through correction function
It is modified, can accurately and effectively identify and whether be caused by explosion, present inventive concept is ingenious, and identification method is simply easy
Row causes the method that the identification of vibration damage constructs the accurate simultaneously strong operability of a set of identification, application environment for structure demolition
Close friend, wide market.
Description of the drawings：
Fig. 1 is ground blasting vibrational waveform figure of the present invention.
Fig. 2 is that EFDD of the present invention decomposes to obtain singular value curve graph.
Fig. 3 is building finite element model of the present invention.
Specific implementation mode：
To keep the purpose, technical scheme and advantage that the present invention is implemented clearer, with reference to specific embodiment and pass through
Attached drawing is described further the technical solution in the present invention.
Embodiment 1：
A kind of tunnel low coverage that the present embodiment is related to passes through the identification method that important building explosion causes vibration damage, tool
Body step carries out as follows：
Lay monitoring point on S1, ground nearest apart from Tunnel Blasting center on building, sensor using gypsum with
Ground is rigidly connected, and to prevent vibration data to be distorted, blasting vibration is tested using blasting vibration instrument, explosion peak value is read and shakes
Speed and main frequency of vibration；As shown in Figure 1, Tunnel Blasting peak value vibration velocity is 3.055cm/s, blasting vibration dominant frequency is 80.25Hz；
S2、《Shotfiring safety regulation》Specified in vibration safety control standard it is as shown in table 1, tunnel Adjacent Buildings it is quick-fried
Broken vibration safety evaluation, it should which the peak value vibration velocity and dominant frequency of ground particle where using are evaluated simultaneously, indispensable；
The safe permitting deformation of 1 blasting vibration of table
Peak value vibration velocity is 3.055cm/s in Tunnel Blasting, and blasting vibration dominant frequency is 80.25Hz, for common civil buildings
Owner's frequency>Safety Vibration Velocity when 50Hz is 2.5~3.0cm/s, alreadys exceed the Safety Vibration Velocity of 2.5~3.0cm/s；Meanwhile when
Ground resident reflects that the building lived cracks, and cracking mode is mainly corner cracking, floor and brick wall contact site cracking, fills out
Fill wall cracks on partition walls, but at this point, cannot judge that Tunnel Blasting vibration centainly causes the damage of building completely, need to take into
One step is analyzed；
S3, the OMA modal tests under the excitation of natural environment load are carried out to the cracking position of the important building of selection, adopted
The modal parameter of building is identified with EFDD modal identification methods, as shown in Fig. 2, i.e. intrinsic frequency, the vibration shape and damping, such as table 2
It is shown,
The building modal parameter that table 2 OMA experiments obtain
S4, the prospective design data for obtaining building, and measure building to obtain the outwardly and inwardly size of building,
The initial finite element model of structure of building is established according to measurement data, as shown in figure 3, material parameter can use empirical value；
S5, solve S4 in the initial finite element model of structure modal parameter, calculate exponent number identified with OMA modal tests
Exponent number be consistent, as shown in table 3：
3 building finite element model intrinsic frequency table of table
The modal parameter that S6, comparison structure finite element model and OMA modal tests obtain, as shown in table 4：
The modal parameter contrast table that 4 building of table limit member and OMA are tested
Measured since the geometric dimension of building is that scene is practical, data are accurate, and masonry and concrete material with when
Between increase, physics, mechanical property can be gradually reduced, and the empirical parameter value of the material of use is difficult that reflection is true, therefore needs to building
Body and concrete material parameter are modified；
S7, object function using the quadratic sum of FEM calculation frequency and practical frequency relative error as object function,
Because its more efficient, correction effect of amendment becomes apparent, such as formula (1)：
In formula：MBHS represents object function, feiTo test obtained frequency, faiFor the frequency that finite element analysis obtains, repair
Modal parameter after just is as shown in table 5：
The correction value of 5 modal parameter of table and initial finite element value and experiment value result
S8, using the revised models of S7 as research object, show that the lower building vulnerable components of Tunnel Blasting vibration mainly have
Larger component is vibrated in high local mode, includes balcony, filling wall, parapet；Include door at stress concentration position
Angle, window angle；Further include having at concrete floor and the interface of brick wall contact at the position of rigidity mutation；
S9, it is obtained by carrying out kinematic analysis to the revised models of S7, the stress level at building stress concentration position
Highest, including door angle, window angle are easiest to damage；Followed by brick wall is relatively easy to damage with concrete interface position
Wound；As vibration velocity continues to increase, the larger position of local vibration in high order mode, including parapet, filling wall and balcony also may be used
It can destroy；
The cracking situation of building member after S10, the live blasting vibration of comparison, discovery corner, floor and brick wall contact position,
The component damage result obtained with numerical computations at the filling crackings such as wall is completely the same, then above-mentioned appraisal of cracks is is shaken by explosion
Damage caused by dynamic.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (1)
1. a kind of tunnel low coverage passes through the identification method that important building explosion causes vibration damage, it is characterised in that its specific step
Suddenly it carries out as follows：
S1, selection need the building that emphasis monitors, and are laid on the ground nearest apart from Tunnel Blasting center on building quick-fried
Broken vibration velocity monitoring point, and three-dimensional velocity sensor is connected using blasting vibration instrument, blasting vibration is tested, explosion peak value vibration velocity is read
And master oscillator frequenc；
S2, basis《Shotfiring safety regulation》The middle safe permitting deformation of vibration velocity carries out the vibration safety evaluation of building, is divided into following
2 kinds of situations：
a：If the vibration peak vibration velocity of test architecture object, which is less than the safety under respective frequencies, allows vibration velocity, it is possible to determine that Tunnel Blasting
Vibration does not cause the damage of building；
b：If the vibration peak vibration velocity of test architecture object, which is more than the safety under respective frequencies, allows vibration velocity, tunnel cannot be judged completely
Blasting vibration centainly causes the damage of building, because《Shotfiring safety regulation》Specified in allow safely vibration velocity be usually there are
Safety stock, it needs that further analysis is taken to determine：I.e. by establishing the real structure model of building, to building
Carry out the dynamic response under blasting vibration and damage feature research, obtain may the component that damage, and with live building
The component of fact damaged cracking is compared, to realize the Damage identification to building under blasting vibration；
S3, the Operational Modal Analysis mode carried out to the building of selection under natural environment load encourages are tried
It tests, using Enhanced Frequency Domain Decomposition Method or Stochastic subspace
Identification Method modal identification methods identify the modal parameter of building, including intrinsic frequency, the vibration shape and resistance
Buddhist nun；
S4, the prospective design data for obtaining building, and measure building to obtain the outwardly and inwardly size of building, according to
Measurement data establishes the initial finite element model of structure of building, and material parameter can use empirical value；
S5, the modal parameter for solving structural finite element model calculate exponent number and keep one with the exponent number that OMA modal tests identify
It causes；
The modal parameter that S6, comparison structure finite element model and OMA modal tests obtain, analysis relative error, Modal
Assurance Criterion values and the reason of cause error；It is measured since the geometric dimension of building is that scene is practical, data
Accurately, and masonry and concrete material increase with the time, and physics, mechanical property can be gradually reduced, the experience of the material of use
Parameter value is difficult that reflection is true, therefore needs to be modified the masonry and concrete material parameter of measured building；
S7, using model modification method, object function is established, by correcting material parameter, boundary condition etc. to finite element model
It is modified so that the structural finite element model of foundation can meet the real features of building；Wherein object function uses and has
Limit member calculates frequency with the quadratic sum of practical frequency relative error as object function, because its amendment is more efficient, corrects effect
Fruit becomes apparent, such as formula (1)：
In formula：MBHS represents object function, feiTo test obtained frequency, faiThe frequency obtained for finite element analysis；
S8, using the revised fabric structure finite element models of S7 as object, probe into obtain under blasting vibration vibration of building compared with
Include balcony, filling wall, parapet for the Local Members that may be damaged strongly；Include door at stress concentration position
Angle, window angle；Further include having at concrete floor and the interface of brick wall contact at the position of rigidity mutation；
S9, using revised building finite element model as object, input the attenuation of seismic waves of actual measurement, research attenuation of seismic waves is made
With the dynamic response for the Local Members that the strong possibility of lower vibration of building is damaged, the local structure that may be damaged is obtained
Part；
S10, the Local Members that may be damaged, the component feelings with construction cracking after live blasting vibration will be obtained in numerical computations
Condition is compared, if consistent with numerical result, then it is assumed that the crack is caused by blasting vibration；It is on the contrary, then it is assumed that should
Crack is not caused by blasting vibration, but due to house caused by the other reasons including settlement of foundation, temperature stress
Cracking.
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Cited By (7)
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|---|---|---|---|---|
| CN108760035A (en) * | 2018-05-30 | 2018-11-06 | 北京市市政三建设工程有限责任公司 | Blasting vibration test and safety evaluation method for tunnel short-distance downward-penetrating slope building |
| CN109470098A (en) * | 2018-10-29 | 2019-03-15 | 武汉大学 | Structure demolition vibration damage evaluation method based on High frequency photographing measurement |
| CN109990764A (en) * | 2019-03-12 | 2019-07-09 | 中国建筑科学研究院有限公司 | Method for monitoring safety of house affected by blasting |
| CN110006482A (en) * | 2019-03-12 | 2019-07-12 | 中国建筑科学研究院有限公司 | Method for monitoring safety of old house |
| CN111829903A (en) * | 2020-07-23 | 2020-10-27 | 中南大学 | Test model and method for simulating blasting accumulated damage test of confined water-containing fractured rock mass |
| CN114781040A (en) * | 2022-05-10 | 2022-07-22 | 青岛理工大学 | Building blasting vibration safety evaluation method, device, equipment and medium |
| CN116305489A (en) * | 2023-04-11 | 2023-06-23 | 北京云庐科技有限公司 | Method, system and medium for monitoring structural damage of building |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760035A (en) * | 2018-05-30 | 2018-11-06 | 北京市市政三建设工程有限责任公司 | Blasting vibration test and safety evaluation method for tunnel short-distance downward-penetrating slope building |
| CN109470098A (en) * | 2018-10-29 | 2019-03-15 | 武汉大学 | Structure demolition vibration damage evaluation method based on High frequency photographing measurement |
| CN109470098B (en) * | 2018-10-29 | 2019-10-25 | 武汉大学 | Structure demolition vibration damage evaluation method based on High frequency photographing measurement |
| CN109990764A (en) * | 2019-03-12 | 2019-07-09 | 中国建筑科学研究院有限公司 | Method for monitoring safety of house affected by blasting |
| CN110006482A (en) * | 2019-03-12 | 2019-07-12 | 中国建筑科学研究院有限公司 | Method for monitoring safety of old house |
| CN110006482B (en) * | 2019-03-12 | 2021-09-17 | 中国建筑科学研究院有限公司 | Method for monitoring safety of old house |
| CN111829903A (en) * | 2020-07-23 | 2020-10-27 | 中南大学 | Test model and method for simulating blasting accumulated damage test of confined water-containing fractured rock mass |
| CN111829903B (en) * | 2020-07-23 | 2021-07-09 | 中南大学 | Test device and method for simulating blasting accumulated damage test of confined water-containing fractured rock mass |
| CN114781040A (en) * | 2022-05-10 | 2022-07-22 | 青岛理工大学 | Building blasting vibration safety evaluation method, device, equipment and medium |
| CN116305489A (en) * | 2023-04-11 | 2023-06-23 | 北京云庐科技有限公司 | Method, system and medium for monitoring structural damage of building |
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