CN104234024B - Measure the series distributed displacement measurement instrument of accelerometer of the lateral permanent displacement of the earthquake liquefaction soil body - Google Patents
Measure the series distributed displacement measurement instrument of accelerometer of the lateral permanent displacement of the earthquake liquefaction soil body Download PDFInfo
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- CN104234024B CN104234024B CN201410555500.1A CN201410555500A CN104234024B CN 104234024 B CN104234024 B CN 104234024B CN 201410555500 A CN201410555500 A CN 201410555500A CN 104234024 B CN104234024 B CN 104234024B
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- accelerometer
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- earthquake
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- 239000002689 soil Substances 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 33
- 238000005259 measurement Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 230000001133 acceleration Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000011089 mechanical engineering Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003653 coastal water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to geotechnical engineerings and mechanical engineering technical field, provide the series distributed displacement measurement instrument of accelerometer for measuring the lateral permanent displacement of the earthquake liquefaction soil body, it is characterized in that the instrument is made of the isometric metal sheet of muti-piece series arrangement, it is connected between metal plate using smooth hinge, every piece of metal sheet surface is fixed with AD accelerometer.The present invention not only compensate for there has been no can directly measurement model test in the lateral permanent displacement of earthquake liquefaction instrument blank, and the data on basis are provided for liquefaction of soil mass lateral deformation mode under further research earthquake and analysis feature, and then provide necessary foundation to evaluate lateral with the expanding flow field bridge pile foundation anti-seismic performance that liquefies.The present invention is ingenious in design, and structure is simple, and test is accurate and intuitive.
Description
Technical field
The present invention relates to a kind of geotechnical earthquake engineering fields for directly measuring the lateral permanent displacement of the earthquake liquefaction soil body
The series distributed displacement measurement instrument of accelerometer.
Background technique
Pile foundation is one of most common a kind of form in deep foundation, big with its bearing capacity, stability is good, sedimentation is small, energy
The features such as enough adapting to various geological conditions and load type, in industry and civil buildings, heavy_weight factory, bridge, high-speed railway, water
It is used widely in the modern projects such as benefit, port and pier, coastal waters wind-power electricity generation and offshore production platform.Many earthquake disaster tune
It tables look-up bright, the lateral large deformation of the soil body and flowing are the main reason for causing bridge pile foundation to destroy, and the soil body is laterally big under earthquake
Deformation plays significant ground control action to the shape of stake.Therefore, it is necessary to be accurately obtained under geological process liquefaction earth laterally forever
Long deflection and its distribution pattern.Important hand of the model test as lateral with the expanding flow field bridge pile foundation anti-seismic performance of evaluation liquefaction
Section.In test, directly obtains the permanent deformation that the soil body under earthquake occurs when liquefaction is lateral to expand stream and just seem and be even more important.In general,
It is more that the lateral set value of liquefaction of soil mass is calculated using the method that numerical method calculates indirectly.However, directly measuring at present
There are still larger difficulties for the lateral permanent displacement of earthquake liquefaction of soil mass, also still laterally permanent without being suitable for the measurement earthquake liquefaction soil body
The test equipment of displacement.
Summary of the invention
The purpose of the present invention is be not suitable for still at present for during earthquake liquefaction with laterally expanding flow field model test
The status for directly measuring the test equipment that the earthquake liquefaction soil body is laterally permanently deformed, provides a kind of series distributed position of accelerometer
Move meter.It can measure the lateral permanent deformation of the soil body during lateral with the expanding flow field bridge pile foundation model test of liquefaction, in turn
It can be efficiently used for lateral expansion flow field ground pile-soil Earthquake interaction problem analysis of liquefying.
The series distributed displacement of accelerometer being laterally permanently deformed provided by the present invention for the measurement earthquake liquefaction soil body
Tester, it is characterised in that the instrument is made of the isometric metal sheet of muti-piece series arrangement, is connected between sheet metal, every piece
It is fixed with AD accelerometer on metal sheet surface, sees Fig. 1.AD accelerometer is able to record the dull component of Acceleration time course simultaneously
With and cyclical component.Tandem metal sheet bottom end linked with model test substrate and connect it is firm, it is ensured that test during soil
As long as lateral displacement, which occurs, for body can cause the inclination of metal plate.
Provided by the present invention for the series distributed displacement of the acceleration that is laterally permanently deformed of the measurement earthquake liquefaction soil body
Tester, it is characterised in that the high-frequency component that the soil body Acceleration time course of record is removed by the method for numerical filtering obtains
The dull Acceleration time course A of the soil bodymean(t).Since dull acceleration value causes (Fig. 1), energy by the inclination of sheet metal
Tiltangleθ (the figure of i-th of (bottommost that the 1st sheet metal is located at soil layer) metal plate is enough accurately calculated by formula (1)
1):
In formula, g is acceleration of gravity.
Using existing geometrical relationship between acceleration of gravity in Fig. 1 and dull acceleration, it is further able to calculate gold
Lateral displacement time-histories of the lateral displacement time-histories u (t) and the soil body of metal thin plate in the depth:
Wherein, L is metal plate length (along soil body buried depth direction).
In order to keep the result of test more acurrate, the present invention also takes following technical measures:
(1) in order to reduce because of rubbing action caused by linking between each sheet metal, smooth hinge is used in junction
Chain is connected.
(2) by adjusting the quality for adhering to light object on sheet metal, so that every piece of sheet metal and attachment are thereon
Object (containing accelerometer) and the density of surrounding soil are consistent, and are guaranteed that the soil body is moved synchronously with displacement measurement instrument, are avoided gold
Metal thin plate and object thereon occur or rising phenomenon.
The invention has the following advantages:
The present invention has not only filled up current still no earthquake liquefaction soil body suitable for the test of direct test model laterally forever
The instrument blank being displaced long, and necessary basis number is provided to study and grasping liquefaction of soil mass lateral deformation mode and distribution
According to, and then bridge pile foundation anti-seismic performance provides direct basis with liquefying lateral expansion flow field for evaluation.In addition, present invention design is skilful
Wonderful, structure is simple, and test is accurate and intuitive.
Detailed description of the invention
Fig. 1 is the schematic diagram for the displacement meter being related in the present invention.
Specific embodiment
Provide embodiment with reference to the accompanying drawing with the invention will be further described, but given embodiment cannot understand
For limiting the scope of the invention, thus professional and technical personnel is according to content and the design philosophy institute of aforementioned present invention
The nonessential modifications and adaptations made also should belong to protection scope of the present invention.
The present invention, which gives, measures to obtain the permanent displacement of liquefaction of soil mass lateral deformation under geological process using displacement measurement
Time-histories implements specific steps, as follows:
(1) displacement meter is laid in model foundation soil in test, it is ensured that displacement meter and substrate strand connection are firm.
(2) then, during test, the acceleration that each depth of the soil body is recorded by the accelerometer of series arrangement is obtained
Spend time-histories.
(3) numerical filtering is carried out to the soil body Acceleration time course of acquisition, obtains the Acceleration time course of soil body dullness.
(4) working principle based on above-mentioned displacement measurement instrument works out the lateral permanent displacement of soil layer in conjunction with formula (1) and (2)
The program of calculating.
(5) by the dull Acceleration time course of above-mentioned each depth of acquisition soil layer, import what the lateral permanent displacement of soil layer calculated
Program obtains soil body permanent displacement time-histories during the effluent that liquefies under earthquake.
Claims (3)
1. the accelerometer tandem displacement measurement instrument for measuring earthquake liquefaction soil body permanent displacement, it is characterised in that the test
Instrument is made of the isometric metal sheet of muti-piece tandem, using articulated connection, every piece of metal sheet surface between metal sheet
It is fixed with AD accelerometer；Then, numerical filtering is carried out to the Acceleration time course of record, when obtaining the dull acceleration of the soil body
Journey, inverse go out the inclination angle of each metal sheet, and the final geometrical relationship using acceleration of gravity and dull acceleration obtains soil
The lateral permanent displacement time-histories of body.
2. according to claim 1 for measuring the accelerometer tandem displacement measurement of earthquake liquefaction soil body permanent displacement
Instrument, it is characterised in that AD accelerometer is able to record the dull component and cyclical component of Acceleration time course.
3. according to claim 1 for measuring the accelerometer tandem displacement measurement of earthquake liquefaction soil body permanent displacement
Instrument, it is characterised in that tandem metal sheet bottom end and substrate it is hinged and be connected to each other it is firm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410555500.1A CN104234024B (en) | 2014-10-20 | 2014-10-20 | Measure the series distributed displacement measurement instrument of accelerometer of the lateral permanent displacement of the earthquake liquefaction soil body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410555500.1A CN104234024B (en) | 2014-10-20 | 2014-10-20 | Measure the series distributed displacement measurement instrument of accelerometer of the lateral permanent displacement of the earthquake liquefaction soil body |
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| Publication Number | Publication Date |
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| CN104234024A CN104234024A (en) | 2014-12-24 |
| CN104234024B true CN104234024B (en) | 2018-12-14 |
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| CN110132763A (en) * | 2019-05-24 | 2019-08-16 | 广西大学 | It is a kind of for test the soil body dynamic stress strain device and its test method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645310A (en) * | 2012-05-08 | 2012-08-22 | 同济大学 | Complete set of test method of soft soil iron structure vibration table |
| CN102998081A (en) * | 2012-12-17 | 2013-03-27 | 黑龙江省博凯科技开发有限公司 | Method for performing bridge monitoring by using multiple strapdown inertial systems |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2442255A1 (en) * | 2002-09-30 | 2004-03-30 | University Of Saskatchewan | Displacement and force sensor |
| US9222866B2 (en) * | 2011-03-01 | 2015-12-29 | The Toro Company | Evaluation of ground surface hardness |
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2014
- 2014-10-20 CN CN201410555500.1A patent/CN104234024B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645310A (en) * | 2012-05-08 | 2012-08-22 | 同济大学 | Complete set of test method of soft soil iron structure vibration table |
| CN102998081A (en) * | 2012-12-17 | 2013-03-27 | 黑龙江省博凯科技开发有限公司 | Method for performing bridge monitoring by using multiple strapdown inertial systems |
Non-Patent Citations (1)
| Title |
|---|
| 可液化场地高承台群桩土-桥梁结构地震相互作用振动台试验;唐亮 等;《中国公路学报》;20100731;第23卷(第4期);第51-56页 * |
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| CN104234024A (en) | 2014-12-24 |
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Inventor after: Tang Liang Inventor after: Ling Xianchang Inventor after: Su Jianguang Inventor after: Xing Dongliang Inventor after: Shao Changming Inventor before: Tang Liang Inventor before: Ling Xianchang |
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Effective date of registration: 20240205 Address after: 150001 No. 92 West straight street, Nangang District, Heilongjiang, Harbin Patentee after: HARBIN INSTITUTE OF TECHNOLOGY Country or region after: China Address before: Box 2647, No. 202 Haihe Road, Harbin City, Heilongjiang Province, 150090 Patentee before: Tang Liang Country or region before: China Patentee before: Ling Xianchang |