CN201203600Y - Triaxial mollisol rheology tester - Google Patents
Triaxial mollisol rheology tester Download PDFInfo
- Publication number
- CN201203600Y CN201203600Y CNU2008200587097U CN200820058709U CN201203600Y CN 201203600 Y CN201203600 Y CN 201203600Y CN U2008200587097 U CNU2008200587097 U CN U2008200587097U CN 200820058709 U CN200820058709 U CN 200820058709U CN 201203600 Y CN201203600 Y CN 201203600Y
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- confined pressure
- loading unit
- pressure chamber
- axial
- soft soil
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Abstract
The utility model discloses a triaxial soft soil rheological tester reflecting multiple stress paths under dynamic load and static load conditions. The tester comprises a confining pressure chamber, an axial loading unit connected to the confining pressure chamber, a confining pressure loading unit, a detecting element for detecting the variable parameters of a sample and a computer, wherein the confining pressure chamber is enclosed and connected to a confining pressure loading unit via a pipeline, and the detecting element is connected to the computer. The tester also includes an axial servo controller for controlling the axial loading unit, and the axial servo controller is connected to the computer via a circuit. Since the axial servo controller is used, the axial loading unit can be controlled according to instructions of the computer, and then a press rod is driven to move downwards and upwards, and the lifting speed of the press rod is controlled. Therefore, conversion between dynamic soil rheological scheme and static soil rheological scheme can be realized at any time.
Description
Technical field
The utility model belongs to Tunnel Engineering and Geotechnical Engineering field, is specially a kind of three soft soil rheological testing machines that can carry out under multiple stress path and the dynamic and static loading condition.
Background technology
Along with the quick expansion of soft soil tunnel, weak soil underground structure scale and scope, the long-term condition of tunnel and underground structure becomes the key factor that influences its safe operation.Rheological test is just more and more paid close attention to owing to the complex stress path that can take all factors into consideration under different confined pressures with underground structure in tunnel and the loads change condition.
The triaxial rheology test of generally using can be divided into two classes: a class is static soil body rheological test, and this class test is more common, and most triaxial rheology tests all belong to this class; Another kind of is dynamic triaxial test, is mainly used to measure the dynamic perfromance index of the soil body.But this type of test at present is the resistance to vibration feature of the simulation soil body mostly, and also rarely found at the soil body rheological test under the cyclic load condition.Therefore need a kind ofly can rationally reflect multiple soil body stress path, the triaxial rheology testing machine that can between dynamic and static soil body rheology scheme, freely switch.
Summary of the invention
The purpose of this utility model is to provide a kind of three novel soft soil rheological testing machines, can under constant confining pressure, carry out dead load and permanent Deformation control, also can apply dynamic loads after a period of time again in dead load or permanent Deformation control by certain frequency and amplitude variations, and then be converted into static load, and carry out with this lasting circulation.
The utility model adopts following technical scheme;
A kind of three soft soil rheological testing machines, the detecting element and the computing machine that comprise confined pressure chamber, the axial loading unit that links to each other with this confined pressure chamber, confined pressure loading unit, test samples running parameter, described confined pressure chamber seals and is connected with the confined pressure loading unit by pipeline, described detecting element is connected with computing machine, also comprise the axial servo controller of Control Shaft to loading unit, this axial servo controller is connected with computing machine by circuit.
Preferably, described detecting element is a force transducer.
Further, to be located at confined pressure indoor for described force transducer.
Preferably, described detecting element is a differential transformer.
Further, described axial loading unit also comprises depression bar, and described confined pressure chamber and differential transformer are separately fixed on the bearing, and the depression bar sidewall is provided with draws arm, and this head of drawing arm withstands differential transformer.
Preferably, described detecting element is an electronic balance, and described confined pressure chamber is connected with beaker on the electronic balance by pipeline.
Preferably, described detecting element is the pressure resistance type pressure unit.
Preferably, also comprise the confined pressure servo controller, this confined pressure servo controller is connected with computing machine through circuit.
Preferably, contain servomotor in described axial loading unit and the confined pressure loading unit.
Owing to adopted axial servo controller, can be according to the axial loading unit of the instruction control of computing machine, move up and down and control its rising or falling speed with driving depression bar.When needs applied static load, axially servo controller can stop output to loading unit by Control Shaft, makes sample bear certain load; When the needs dynamic loads, no matter be permanent distortion or by the dynamic loads of certain frequency and amplitude variations, axially servo controller can both Control Shaft drives depression bar to loading unit and carry out constant speed rising, decline or oscillation cycle motion.Therefore, can realize conversion between the dynamic and static soil body rheology scheme at any time by axial servo controller.
In addition,, can measure power or distortion situation on the sample owing to be provided with force transducer, differential transformer, electronic balance, pressure resistance type pressure unit, and interstitial water flow, interstitial hydraulic pressure and confined pressure.
Description of drawings
The theory structure synoptic diagram of three soft soil rheological testing machines that Fig. 1 relates to for the utility model.
Among the figure:
1, loam cake 2, confined pressure chamber 3, force transducer 4, organic glass tube 5, sample
6, pressure resistance type pressure unit 7, differential transformer 8, bearing 9, depression bar 10, support
11, confined pressure servoBcylinder 12, ball-screw 13, axially load AC servo motor 14, speed reduction unit
15, confined pressure AC servo motor 16, electronic balance 17, confined pressure servo controller 18, axial servo controller
19, deformation measurement amplifier 20, dynamometry amplifier 21, computing machine 22, printer
Embodiment
As Fig. 1, three soft soil rheological testing machines that the utility model relates to comprise the detecting element and the computing machine 21 of confined pressure chamber 2, axial loading unit, confined pressure loading unit, test samples 5 running parameters.Described confined pressure chamber 2 is containers of sealing, is used for the sample 5 that is mounted in it is applied confined pressure, mainly is made up of organic glass tube 4, loam cake 1 and six roots of sensation connecting link, gland nut and bearing 8.Confined pressure chamber 2 is connected with axial loading unit.Described axial loading unit is made up of axial loading AC servo motor 13, turbine and worm speed reduction unit 14, ball-screw 12, depression bar 9, carrying cylinder.Axially load AC servo motor 13 and drive reducer of turbodrill 14, be connected with ball-screw 12 by an Oldham's coupling on speed reduction unit 14 output shafts by cog belt.The lower end of ball-screw 12 places in the carrying cylinder by one group of bearing, and carrying cylinder is fixed on the guide pole that support 10 platens draw, and ball-screw 12 passes guide pole.Fixing depression bar 9 on the nut, on depression bar 9, also adorning a guide arm, guide arm is tightened on the guide pole by Bearing support, when servomotor drives ball-screw 12 rotations by speed reduction unit 14, because the effect of guide arm, the depression bar 9 that makes nut and fix on it can only move up and down, and can not rotate, and thus sample 5 is applied axial force.The confined pressure loading unit is connected with confined pressure chamber 2 by pipeline, and the confined pressure loading unit is made up of confined pressure AC servo motor 15, planetary reducer 14, ball-screw 12, confined pressure servoBcylinder 11.Servomotor drives speed reduction unit 14 by cog belt, its output shaft links to each other with ball-screw 12, the nut of ball-screw 12 is fixed on the side end cap of confined pressure servoBcylinder 11, ball-screw 12 front ends extend in the confined pressure servoBcylinder 11, link to each other with piston by one group of bearing, be full of water in the cylinder body of piston nose.
Described detecting element is used to measure the running parameter of sample 5, data is sent to computing machine 21 carries out Treatment Analysis.Detecting element can be force transducer 3, differential transformer 7, electronic balance 16, pressure resistance type pressure unit 6, measures power or distortion situation on the sample 5, and interstitial water flow, interstitial hydraulic pressure and confined pressure.
Below introduce each detecting element and principle of work thereof in detail.
Axial deflection is measured and is used differential transformer 7.Differential transformer 7 is fixed on the support on the confined pressure chamber bearing 8, on depression bar 9 sidewalls, fix one and draw arm, a zeroing set screw is arranged on it, this screw head end face and differential transformer 7 iron cores withstand, like this, the distortion that sample 5 is produced under depression bar 9 effects equates that with the displacement of depression bar 9 relative confined pressure chamber bearings 8 this displacement is measured by differential transformer 7.Equally preferably, differential transformer 7 can reach computing machine 21 after by deformation measurement amplifier 19 with signal, and this deformation measurement amplifier 19 is three-channel AC amplifier, is 3.5Hz for bridge, and 1,2,5,10 4 decay shelves is arranged.
The interstitial water flow measurement adopts SUNG-150 electronic balance 16 to measure, an aperture is arranged on confined pressure chamber bearing 8, link to each other with aperture on bearing 8 bottom surfaces with nylon tube, communicate with beaker on the electronic balance 16 through the nylon tube on the stop valve again, when needs are measured hole discharge, open stop valve, pore water just flows in the beaker of electronic balance 16, thereby weighs up the amount of water outlet.Electronic balance 16 has the RS232 interface, links to each other with computing machine 21 by lead, and institute is surveyed data transmission in computing machine 21, and the process processes and displays is on screen.
Confined pressure and pore water pressure force measurement all are to adopt MPM480 type pressure resistance type pressure unit 6, and the signal of pressure resistance type pressure unit 6 is delivered directly in the D/A card of computing machine 21, and the processing by computing machine 21 is presented at force value on the screen at last.
The controlling object of described axial servo controller 18 is axially to load AC servo motor 13.Preferably, its input end is connected with computing machine 21, and output terminal is connected with axial loading unit.Axially servo controller 18 comprises servo-driver and test control module, sends instruction by the button on computing machine 21 programs or the testing machine, and the test control module receives back control servo-driver, thereby realizes rising, decline and the speed thereof of depression bar 9.And this axial servo controller 18 has various defencive functions, when the trial load outrange, and when perhaps sample 5 is disrumpent feelings, the order self-stopping that can transmit by computing machine 21, and axial loading unit sent corresponding signal.The controlling object of confined pressure servo controller 17 is a confined pressure AC servo motor 15, makes confined pressure chamber 2 obtain stable confined pressure, and it is with axially the principle of work and the characteristics of servo controller 18 are identical.
Process of the test is as follows: before testing, at first dynamometry amplifier 20 is demarcated, testing machine energising preheating is more than 30 minutes.Under 1 times of shelves condition, each gauge outfit is demarcated, if the calibration value that gauge outfit demonstrates exceeds more than 0.3% of given demarcation number,, make it to reach calibration value by regulating corresponding dynamometry amplifier 20 circuit boards.According to the selected suitable measurement gear of test load, trial value is preferably in 20%～80% of selected range.Do not regulate zero point with thick, fine zero potentiometer before test starts, make amplifier be shown as zero.After beginning to load, dynamometry amplifier 20 demonstrates the power value that affacts on the sample 5.
Then the deformation measurement amplifier is demarcated, scaling method is identical with the scaling method of dynamometry amplifier 20.
Also need before the test electronic balance 16 zero setting.
In process of the test, main frame is operated, operating process comprises: loading and unloading sample 5, to 2 water fillings of confined pressure chamber, carry out load test.In loading and unloading tests with in 2 the injecting processes of confined pressure chamber and add in the process of pre-load; all adopt manual operation control test (being that the corresponding button is arranged on the testing machine); manually in the control procedure speed regulator potentiometer is being put into less position; by pressing ascending, descending and stopping button; control lifting of depression bar 9 and moving forward and backward of confined pressure servoBcylinder 11 pistons; at this moment; when if depression bar 9 or piston reach capacity the position; testing machine meeting auto stop; prompting is operated according to reverse direction, makes depression bar 9 or piston break away from ultimate limit state.When formal load test, can select automatic control, by mode and the speed of loading and the record that carries out test figure of computing machine 21 control loaded.When in selecting process of the test, changing test method, can select to withdraw from present mode of operation, select to keep present loading system not change simultaneously, start working up to new loading system, therefore, this testing equipment can carry out different test type switchings to same sample 5.
Claims (9)
1. three soft soil rheological testing machines, the detecting element and the computing machine (21) that comprise confined pressure chamber (2), the axial loading unit that links to each other with confined pressure chamber (2), confined pressure loading unit, test samples (5) running parameter, described confined pressure chamber (2) seals and is connected with the confined pressure loading unit by pipeline, described detecting element is connected with computing machine (21), it is characterized in that: also comprise the axial servo controller (18) of Control Shaft to loading unit, this axial servo controller (18) is connected with computing machine (21) by circuit.
2. three soft soil rheological testing machines according to claim 1 is characterized in that: described detecting element is force transducer (3).
3. three soft soil rheological testing machines according to claim 2 is characterized in that: described force transducer (3) is located in the confined pressure chamber (2).
4. three soft soil rheological testing machines according to claim 1 is characterized in that: described detecting element is differential transformer (7).
5. three soft soil rheological testing machines according to claim 4, it is characterized in that: described axial loading unit also comprises depression bar (9), described confined pressure chamber (2) and differential transformer (7) are separately fixed on the bearing (8), depression bar (9) sidewall is provided with draws arm, and this head of drawing arm withstands differential transformer (7).
6. three soft soil rheological testing machines according to claim 1 is characterized in that: described detecting element is electronic balance (16), and described confined pressure chamber (2) is connected with beaker on the electronic balance (16) by pipeline.
7. three soft soil rheological testing machines according to claim 1 is characterized in that: described detecting element is pressure resistance type pressure unit (6).
8. three soft soil rheological testing machines according to claim 1 is characterized in that: also comprise confined pressure servo controller (17), this confined pressure servo controller (17) is connected with computing machine (21) through circuit.
9. three soft soil rheological testing machines according to claim 1 is characterized in that: contain servomotor in described axial loading unit and the confined pressure loading unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200587097U CN201203600Y (en) | 2008-05-21 | 2008-05-21 | Triaxial mollisol rheology tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200587097U CN201203600Y (en) | 2008-05-21 | 2008-05-21 | Triaxial mollisol rheology tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201203600Y true CN201203600Y (en) | 2009-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200587097U Expired - Fee Related CN201203600Y (en) | 2008-05-21 | 2008-05-21 | Triaxial mollisol rheology tester |
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| Country | Link |
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| CN (1) | CN201203600Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636391A (en) * | 2012-02-15 | 2012-08-15 | 中山大学 | Weak soil dynamic behavior testing system for continuously and finely tracking in overall-process manner |
| CN106761730A (en) * | 2016-12-20 | 2017-05-31 | 安徽理工大学 | A kind of fast demountable clamps component and its confined pressure experimental provision |
| CN112268813A (en) * | 2020-11-11 | 2021-01-26 | 太原理工大学 | Multi-parameter measuring device and method for THMC coupling coal rock mass triaxial rheological test |
| CN112284922A (en) * | 2020-11-11 | 2021-01-29 | 太原理工大学 | Coal rock mass high-temperature triaxial rheological and dynamic and static combined loading test device |
| CN113466434A (en) * | 2021-07-13 | 2021-10-01 | 中国科学院西北生态环境资源研究院 | Self-feeding frozen soil mechanical testing system |
-
2008
- 2008-05-21 CN CNU2008200587097U patent/CN201203600Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636391A (en) * | 2012-02-15 | 2012-08-15 | 中山大学 | Weak soil dynamic behavior testing system for continuously and finely tracking in overall-process manner |
| CN106761730A (en) * | 2016-12-20 | 2017-05-31 | 安徽理工大学 | A kind of fast demountable clamps component and its confined pressure experimental provision |
| CN112268813A (en) * | 2020-11-11 | 2021-01-26 | 太原理工大学 | Multi-parameter measuring device and method for THMC coupling coal rock mass triaxial rheological test |
| CN112284922A (en) * | 2020-11-11 | 2021-01-29 | 太原理工大学 | Coal rock mass high-temperature triaxial rheological and dynamic and static combined loading test device |
| CN113466434A (en) * | 2021-07-13 | 2021-10-01 | 中国科学院西北生态环境资源研究院 | Self-feeding frozen soil mechanical testing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090304 Termination date: 20110521 |