CN102636391A - Weak soil dynamic behavior testing system for continuously and finely tracking in overall-process manner - Google Patents
Weak soil dynamic behavior testing system for continuously and finely tracking in overall-process manner Download PDFInfo
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Abstract
The invention discloses a weak soil dynamic behavior testing system for continuously and finely tracking in an overall-process manner. The weak soil power property testing system consists of a pressure chamber, a pressure control system, an excitation system, a measurement system, a servo control system, a microscopy observing system and a computer system. The weak soil power property testing system provided by the invention has the main advantages of overall-process continuous and fine tracking and high-precision measurement under the action of water. Furthermore, the multi-scale panorama three-dimensional observation can be realized, so as to finally show power properties of weak soil.
Description
Technical field
The invention belongs to Geotechnical Engineering test apparatus field, particularly under the water action condition, the kinematic behavior (fatigue resistance, dynamic shear modulus and damping ratio etc.) of weak soil is carried out continuous meticulous tracking of overall process and high precision measurement, and relate to the design of testing program.
Background technology
Because weak soil intensity is low, compressibility is high, and water permeability is little, and has rheological, makes the construction of covering works on it difficulty and complicated that becomes under dynamic load (earthquake load, wave load, traffic loading etc.), engineering accident very easily to occur.Through test to the ground weak soil, grasp the various kinematic behavior indexs of weak soil, take corresponding disaster prevention measure, be the important channel of reducing building structure accident and loss on the soft base.
Dynamic load has randomness and complicacy, and therefore, the range of strain of weak soil dynamical problem research is bigger, needs to use different test methods to measure soil body kinematic behavior parameter.Indoor soil dynamic test instrument mainly contains dynamic triaxial apparatus, oscillatory shear appearance, resonance column device, shaking table, hydro-extractor etc.; Use these instruments, in the indoor test that can do from small strain to big strain: as adopting piezoelectric ceramic bending element shear wave velocity measurement system testing soil sample at minimum range of strain (10
-5-10
-3Kinematic behavior index %); Adopt resonance column device test soil sample in small strain scope (10
-4-10
-2Kinematic behavior index %); Adopt multifunctional triaxial appearance test soil sample at big range of strain (10
-2-10%) kinematic behavior index.Because the restriction of various method of testing measuring accuracy scopes can only be measured in corresponding range of strain the test of weak soil fatigue resistance, dynamic shear modulus and damping ratio etc., then differently strained section measurement data is integrated research experiment.This not only makes test become loaded down with trivial details, and the sum of errors that has increased test is uncertain, and it is discrete and be connected bad shortcoming also can't to overcome the testing site.In addition, testing tool in the past can only carry out the part to test specimen and observe, and the experimental phenomena that obtains is comprehensive inadequately and three-dimensional, even can ignore important experimental phenomena.Therefore design a cover and can three-dimensional panorama observe the weak soil kinematic behavior pilot system with meticulous tracking, the full strain path continuous precise problems of measurement of solution weak soil has crucial scientific meaning and wide application prospect.
Summary of the invention
The object of the present invention is to provide full strain path (10
-5-10%) the weak soil kinematic behavior pilot system of continuous meticulous tracking realizes continuous meticulous tracking of overall process and high-precision measurement under the water action condition, and can carry out multiple dimensioned panorama three-dimensional observation, finally discloses the kinematic behavior of weak soil.
For reaching the object of the invention, the technical scheme of employing is following:
Based on multi-functional moving triaxial test system, comprise by the pressure chamber, control pressurer system, excitation system, measuring system, servo-control system, microscopic observation system and computer system are formed.
Introduce the concrete composition and the function of each several part below in detail:
1. the pressure chamber is by pressure chamber's organic glass shell, soil sample base cushion cap, and soil sample axially loads axle and forms.
Process by organic glass around the round pressure chamber, be convenient to weak soil surface characteristics in the microscope three-dimensional panorama viewing test process.The situation that the pressure chamber is inner; On the axis of pressure chamber, be distributed as soil sample base cushion cap, soil sample and soil sample from top to bottom successively and axially load axle, can realize soil sample is carried out axial pressure; The WS is present between axis equipment and the pressure chamber's shell, water environment of supplying soil sample and radial pressure.
2. control pressurer system is by the axial pressure control system, axial pressure equipment, and confined pressure control system, confined pressure loading equipemtn are formed.
Control pressurer system is used for the size of pressure is controlled.According to different testing programs; Regulate soil sample axle pressure and confined pressure radially in the different time section by control pressurer system; Enable the pressure-bearing situation of weak soil under the various arrangement and method for construction in the model engineering, the confined pressure control system provides the function to water-filling in the pressure chamber and pressurization through the confined pressure loading equipemtn simultaneously.
3. excitation system can provide simulated earthquake, wave, and various dynamic loads such as traffic and construction vibration link to each other with high-performance computer, are controlled by high-performance computer.
4. measuring system is by axial data measurin system, and radially optical fiber measuring system and data acquisition converting system and (FBG) demodulator are formed.
Axially data measurin system stress, the strain data that soil sample is axial collects in the data acquisition converting system, feeds back to servo-control system again.
The radial pressure measuring system in converting system, feeds back to servo-control system with the data acquisition of soil sample radial stress again.
Radially wavelength modulation type fibre optic strain sensor is transferred to measurement data in the (FBG) demodulator, feeds back in the high-performance computer again, converts the soil sample shear strain to.
5. servo-control system is made up of two servo controllers.
Servo controller links to each other with the axle pressure measuring system with the axial pressure control system respectively, and according to stress, strain data that axial data measurin system feeds back, in time adjusts axle pressure through the axial pressure control system; Servo controller links to each other with the radial pressure measuring system with the confined pressure control system respectively, and according to the stress data that the radial data measuring system is fed back, in time adjusts radially confined pressure through the confined pressure control system.Two servo controllers are real-time transmitted to stress, strain data in the high-performance computer simultaneously.
6. microscopic observation system is by microscope, the microscopic track, and microscope stand, image acquisition device, image dissector is formed.
Microscopic observation system is observed soil sample surface breakdown phenomenon with microscope, and utilizes image acquisition device that the soil sample surface characteristics is caught, and the signal that collects is transferred to changes in the image dissector and analyze, and is transferred in the high-performance computer most.
7. computer system is made up of a high-performance computer.
High-performance computer is used to control excitation system; Record servo-control system and (FBG) demodulator transmit stress, strain data and the working condition of coming in; And the data of gathering are represented to the user with visual way; Simultaneously also be used to store and the picture signal that shows that microscopic observation system is gathered, and can be for further processing according to user's requirement.
Advantage of the present invention is:
1, can realize continuous meticulous tracking of full strain section and high-precision measurement.
2, measurement process under the water action condition can be realized, quick disdrainage test can be carried out, discharging consolidation triaxial test not, the discharging consolidation triaxial test, not draining is consolidation test etc. not, for carrying out the weak soil experimental research on dynamic properties reliable foundation is provided.
3, can realize multiple dimensioned panorama three-dimensional observation, the change procedure of weak soil under dynamic load function carried out high precision, high resolving power ground seizure, tracking and identification and omnidistance dynamically recording.
4, native system is simple in structure, measuring accuracy is high, good stability, workable, height of instrument are convenient, and the installation testing personnel are not had very strong technical requirement.
Description of drawings
Fig. 1 is an ingredient synoptic diagram of the present invention:
Wherein:
A---pressure chamber
A1---the shell A2 of pressure chamber---organic glass shell
Soil sample axially loads axle to A3---soil sample base cushion cap A4---
B---control pressurer system
B1---axial pressure control system B2---axial pressure equipment
B3---confined pressure control system B4---confined pressure loading equipemtn
C---measuring system
C1---axial data measurin system C2---radial pressure measuring system
C3---data acquisition converting system
D---servo-control system
D1---servo controller D2---servo controller
E---microscopic observation system
E1---microscope E3---microscope self-equilibrating support
E2---image acquisition device E4---image dissector
E5---microscope annular observation track
F---computer system
F---high-performance computer
G---the continuous strain monitoring of optical fiber system
G1---wavelength-modulated type fibre optic strain sensor G2---optical cable
G3---(FBG) demodulator
H---excitation system
I---soil sample
Fig. 2 is the embodiment process flow diagram.
Embodiment
Specify use-pattern of the present invention below in conjunction with attaching Fig. 1 and 2.
Concrete use step of the present invention is following:
1. place testing equipment successively, connect each sub-systems.
With the weak soil sample place with the A of pressure chamber in, installation shaft to radial data measuring system C1, C2.
3. startup power supply is set mode, loading speed and the load rank of Loading Control through servo-control system D.
4. regulate microscopic observation system E, enable to observe clearly the situation on weak soil surface; Simultaneously setting shaft is to measuring system and confined pressure measuring system C radially, and radially data acquiring frequency and the aftertreatment requirement among the optical fiber measuring system G.
5. starting pressure control system B controls axle pressure that applies and confined pressure in the pressure chamber through axial pressure control system B1 and confined pressure control system B3.
6. the startup excitation system applies the dynamic load that test needs.
7. start measuring system C and microscopic observation system E, begin to carry out data recording and weak soil sample surfaces and observe.
8. the data of measuring system C being gathered are transferred to high-performance computer F through servo controller D, and the data that the G of optical fiber measurement system gathers directly are transferred to high-performance computer F, through handling, data are represented in visual form to the user; To give high-performance computer F through the picture transmission that microscopic observation system E takes, and show the user through video and image processing software, and the photo of taking is stored.
9. continue step 7, until off-test.
Claims (5)
1. the weak soil kinematic behavior pilot system of the continuous meticulous tracking of overall process comprises the pressure chamber, control pressurer system, and excitation system, measuring system, servo-control system, microscopic observation system and computer system are formed.It is characterized in that: continuous meticulous tracking of overall process and high-precision measurement under the water action condition, and can realize multiple dimensioned panorama three-dimensional observation, finally disclose the kinematic behavior of weak soil.
2. the weak soil kinematic behavior pilot system of the continuous meticulous tracking of a kind of overall process according to claim 1 is characterized in that:
By water confined pressure is provided in the pressure chamber, wavelength-modulated type fibre optic strain sensor can realize that the high precision under the water action condition measures.
3. according to the weak soil kinematic behavior pilot system of claim 1 and the continuous meticulous tracking of 2 described a kind of overall processes, it is characterized in that:
Wavelength-modulated type fibre optic strain sensor can carry out the continuous meticulous tracking of full strain section, solves the discontinuous problem of strain measurement.
4. the weak soil kinematic behavior pilot system of the continuous meticulous tracking of a kind of overall process according to claim 1 is characterized in that:
Measuring system is by axial data measurin system, optical fiber measuring system radially, and optical cable, (FBG) demodulator, radial pressure data system and data acquisition converting system are formed.
Axial data measurin system in the measuring system, the radial pressure data system links to each other with the data acquisition converting system, more respectively with servo-control system in servo controller be connected.Optical fiber measuring system radially, optical cable links to each other with (FBG) demodulator, links to each other with computing machine again.
5. the weak soil kinematic behavior pilot system of the continuous meticulous tracking of a kind of overall process according to claim 1 is characterized in that:
Microscopic observation system is by microscope, microscope self-equilibrating support, and microscope annular observation track, image acquisition device, image dissector is formed.
The order of laying of microscopic observation system does, microscope self-equilibrating support is placed on the annular observation track, and microscope is placed on the microscope self-equilibrating support, image acquisition device is installed on the microscope, and is connected on the image dissector.
In the microscopic observation system in image dissector and the computer system high-performance computer be connected.
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Cited By (9)
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| CN102879274A (en) * | 2012-10-11 | 2013-01-16 | 中山大学 | Optical fiber sensing real-time measurement system for high-confining-pressure tri-axial test |
| CN102914630A (en) * | 2012-10-11 | 2013-02-06 | 中山大学 | Multi-scale mechanical testing system for rock water-force-coupled rheological damage |
| CN103543061A (en) * | 2013-06-19 | 2014-01-29 | 吉林大学 | Cross-scale in-situ mechanical dynamic capture test platform |
| CN103674679A (en) * | 2012-08-30 | 2014-03-26 | 中国石油化工股份有限公司 | Device and method for testing mechanical properties of fracture-vug type carbonate rock reservoir environment |
| CN103760241A (en) * | 2014-01-11 | 2014-04-30 | 吉林大学 | Shipborne resonant column instrument |
| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN110068614A (en) * | 2019-05-20 | 2019-07-30 | 中国科学院武汉岩土力学研究所 | A kind of sample fixing device and method for flexure element test |
| CN112504337A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN114370925A (en) * | 2021-12-06 | 2022-04-19 | 南京大学 | Method for determining distributed optical fiber sensing channel |
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| CN102914630A (en) * | 2012-10-11 | 2013-02-06 | 中山大学 | Multi-scale mechanical testing system for rock water-force-coupled rheological damage |
| CN102879274A (en) * | 2012-10-11 | 2013-01-16 | 中山大学 | Optical fiber sensing real-time measurement system for high-confining-pressure tri-axial test |
| CN103543061A (en) * | 2013-06-19 | 2014-01-29 | 吉林大学 | Cross-scale in-situ mechanical dynamic capture test platform |
| CN103760241B (en) * | 2014-01-11 | 2016-08-17 | 吉林大学 | Shipborne resonant column instrument |
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| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN110068614A (en) * | 2019-05-20 | 2019-07-30 | 中国科学院武汉岩土力学研究所 | A kind of sample fixing device and method for flexure element test |
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| CN112504337A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN112504337B (en) * | 2020-11-30 | 2022-05-13 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN114370925A (en) * | 2021-12-06 | 2022-04-19 | 南京大学 | Method for determining distributed optical fiber sensing channel |
| CN114370925B (en) * | 2021-12-06 | 2022-10-18 | 南京大学 | Method for determining distributed optical fiber sensing channel |
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Application publication date: 20120815 |