CN109540676A - It is a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing - Google Patents
It is a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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Abstract
The invention belongs to rock mechanics and engineering field laboratory test technical fields, and in particular to a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing.Including servo motor loading device, servo motor load control unit, machinery loading device and mechanical stable-pressure device；Wherein, creepmeter of the present invention uses the mechanical voltage regulation way of counterweight counterweight pressure stabilizing, overcomes the shortcomings that Rock Under Uniaxial Compression Compressive rheological behaviours instrument voltage regulation result in Long time scale under existing SERVO CONTROL is poor, servo accuracy is low, power failures test progress；Using servo motor pressurization, mechanical pressurization two ways, based on servo motor pressurization, supplemented by mechanical pressurization, overcomes standard machinery control uniaxial static creep test machine and need manual loading, time-consuming and laborious disadvantage；And the machinery stable-pressure device, in such a way that counterweight counterweight carries out pressure stabilizing, even if in the case where test specimen generates compression creep deformation, it also being capable of real-time ftercompction, it is ensured that load is steady in a long-term.
Description
Technical field
The invention belongs to rock mechanics and engineering field laboratory test technical fields, and in particular to a kind of to be added using servo
It carries, the soft rock single shaft creepmeter of mechanical pressure stabilizing.
Background technique
Mineral rheology performance refer to rock under force its intensity, deformation etc. at any time slowly changed performance,
By study of rocks rheological property, analytical judgment can be made for the long term stability problem of rock engineering.Creep refers to rock
Under constant temperature and pressure effect, deformation is a kind of form of expression of rheology at any time and the phenomenon that increase, most of rheologies examinations
It is all constant using guaranteeing to be further applied load for testing, and the creep mode that research deformation changes over time rule is studied.
Rock mechanics worker has carried out a large amount of laboratory test for rock especially Soft Rock Rheology mechanical characteristic at present.
It is also most important test that wherein soft rock uniaxial compression creep test, which is most basic, it is required that test specimen axis pressure is once being applied to test specimen
Kept constant in overall process, the variation more than allowable range of error cannot be generated.Accordingly, soft rock single shaft creepmeter be
Voltage stabilizing function is added on the basis of Rock Under Uniaxial Compression compression test, to guarantee that load is once application in creep test, when needing long
Between keep constant this it is most basic be also most important requirement.Rock Under Uniaxial Compression testing machine is SERVO CONTROL under normal conditions, therefore
Most of single shaft creepmeters carry out pressure stabilizing using servo motor, this can guarantee load to a certain extent along in this way
Stabilization, Southwest Jiaotong University, Hohai University, Tongji University, Chinese Academy of Sciences Wuhan ground institute etc. have relevant test to set
It is standby.A small number of mechanisms using mechanical pressure stabilizing creepmeters, using lever principle by lighter counterweight come in the way of balancing larger load into
Row pressure stabilizing operation, such as the GFQ-I type uniaxial compression rheometer of Zhongnan Polytechnic Univ.
The existing testing equipment for Rock Under Uniaxial Compression compression creep test there are mainly two types of form:
(1) Serve Motor Control testing machine.This kind of testing machine uses SERVO CONTROL to realize that automatic compensation practical function exists
The error between load and setting value on test specimen, this point have very easily effect in conventional one-axis compression test.
But creep test has the characteristics that the test period is long, load requirement lasting accuracy is high, and servo control experimental machine is it is difficult to ensure that when long
Interior quick response, automatic compensation error during creep test so that it is guaranteed that keep load constant；In addition, this kind of testing machine
Need to be electrified for a long time use, situations such as accident power-off will cause test and interrupt in test, cause to test process and result very big
It influences.
(2) Mechanical course creep testing machine.This kind of testing machine uses mechanical load, using lever principle etc. by adding by hand
Load mode applies to load required by test specimen, and mechanical voltage stabilizing technique is taken such as to apply counterweight mode guarantee test long period
Internal loading it is constant.This testing machine makes test process exempt external condition interference to greatest extent without being driven by electricity.But this kind
Testing machine needs manual loading, and loading procedure is time-consuming and laborious, uses inconvenience；Manual loading process is it is difficult to ensure that load is pressed
Apply according to predetermined loading velocity, this will cause certain influence to test piece intensity；In addition, lever system occupied space is larger, examination
It tests inconvenient for operation.
Summary of the invention
The present invention provides a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing in view of the above technical problems.
Instrument overall stiffness is high, and instrument component non-deformability is strong, and load stability is good (pressure stabilizing 6 months), load transducer calibration
Accuracy is good, and precision is high.
The present invention is achieved by the following technical solutions:
It is a kind of electric using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing, including servo motor loading device, servo
Machine loads control unit, machinery loading device and mechanical stable-pressure device；
Servo motor loading device is loaded for being further applied load at creep test initial stage to test specimen in the servo motor
The first bearing plate is arranged in the top of device, and the test specimen is placed in the top of first bearing plate；
Servo motor loads control unit, turns off or on for controlling servo motor loading device, and for compacted
Become test initial stage control the servo motor loading device in a manner of electronic according to certain loading velocity to test specimen be further applied load to
Goal-setting payload values；
Machinery loading device, the screw-threaded shaft elevator including being set to test piece upper part are set in the lower part of the screw-threaded shaft elevator
The second bearing plate is set, the test specimen is between first bearing plate and second bearing plate；Close the servo motor
After loading device, if there is error between actual loading suffered by test specimen and goal-setting payload values, the machinery loading device root
According to the error payload values between the practical bearing load value of test specimen and goal-setting payload values, the lifting of the screw lift is controlled
Ftercompction is carried out, to apply mechanical load to goal-setting payload values to test specimen；
Mechanical stable-pressure device, including the steady of the screw-threaded shaft elevator lifting is connected and can controlled with the screw-threaded shaft elevator
Wheel pressing shaft, the pressure stabilizing wheel shaft carry out pressure stabilizing using counterweight counterweight.
Further, the machinery loading device further includes mechanical load wheel shaft, the mechanical load wheel shaft and the silk
The connection of thick stick elevator, the lifting that the screw lift can be controlled by shaking the mechanical load wheel shaft carry out ftercompction.
Further, the mechanical stable-pressure device further includes steel strand wires, hook, counterweight；Steel strands wound is in the pressure stabilizing
On wheel shaft, counterweight is connected by hook with the steel strand wires；Counterweight weight is amplified certain multiple by screw lift and applies
Onto the test specimen；
The pressure stabilizing wheel shaft and the mechanical load wheel shaft coaxial linkage, all in accordance with worm gear snail inside the screw-threaded shaft elevator
Bar is mutually twisted to control screw lift movement；
When carrying out pressure stabilizing, institute is determined to the amplification factor of power according to test specimen goal-setting payload values and screw lift
Counterweight weight is needed, to guarantee when the practical bearing load value of test specimen is less than goal-setting payload values, the energy under Weight gravity effect
Enough realize ftercompction to design load value；By the counterweight of corrresponding quality via the steel strand wires being wrapped on the pressure stabilizing wheel shaft in pressure stabilizing
Load is kept to stablize on wheel shaft.
Further, the creepmeter further includes test table top, reaction frame, and one end of the reaction frame is fixedly installed on institute
It states on test table top, the other end is fixedly connected with the screw-threaded shaft elevator；
The servo motor loading device, servo motor load control unit are arranged on the experiment table top.
Further, real for real-time measurement test specimen in first bearing plate lower part or internal installation pressure sensor
Border bearing load value；Axial displacement meter and radial displacement meter are set between first bearing plate and second bearing plate,
And the axial displacement meter and the radial displacement meter are fixed on test specimen, the axial displacement meter and radial displacement score
Not Yong Yu real-time measurement test specimen generate axial direction, radial strain.
It is a kind of using servo loading, the soft rock uniaxial static creep test method of mechanical pressure stabilizing, using the creepmeter, comprising:
Test specimen is placed between the first bearing plate and the second bearing plate, at creep test initial stage, servo motor load control
Servo motor loading device is opened in unit control processed, and is controlled the servo motor loading device and added in a manner of electronic according to certain
Speed is carried to be further applied load to goal-setting payload values to test specimen；
Servo motor loads control unit control and closes servo motor loading device；
If servo motor loading device has error after closing between test specimen load and target design payload values, calculate
Error payload values between the practical bearing load value of test specimen and goal-setting payload values, shaking the mechanical load wheel shaft can control
The lifting for making the screw lift carries out ftercompction, until the practical bearing load value of test specimen reaches goal-setting payload values；
Counterweight weight needed for being determined according to test specimen goal-setting payload values and screw lift to the amplification factor of power, with
Guarantee to can be realized ftercompction to setting under Weight gravity effect when the practical bearing load value of test specimen is less than goal-setting payload values
Count payload values；Load is kept to stablize on pressure stabilizing wheel shaft by hanging over the counterweight of corrresponding quality.
Further, by the pressure sensor, the axial displacement meter and the radial displacement meter, to test specimen
Suffered stress and generated axial direction, radial strain is observed in real time, is obtained and is described image.
Advantageous effects of the invention:
(1) creepmeter main innovation point of the present invention is the mechanical voltage regulation way using counterweight counterweight pressure stabilizing, is overcome
Rock Under Uniaxial Compression Compressive rheological behaviours instrument voltage regulation result in Long time scale under existing SERVO CONTROL is poor, servo accuracy is low, power-off shadow
The shortcomings that ringing test progress；
(2) creepmeter of the present invention uses servo motor pressurization, mechanical pressurization two ways, and servo motor pressurization is
It is main, supplemented by mechanical pressurization, overcomes standard machinery control uniaxial static creep test machine and need manual loading, time-consuming and laborious disadvantage；
(3) amplifying device of the power of the worm and gear composition inside the middle screw-threaded shaft elevator of creepmeter of the present invention, will
Power amplification output, at the same compared with common lever device, it is compact-sized, it occupies little space, more portable and effective, economizes on resources；
(4) the mechanical stable-pressure device of creepmeter of the present invention overcomes existing in such a way that counterweight counterweight carries out pressure stabilizing
Have that Rock Under Uniaxial Compression Compressive rheological behaviours instrument voltage regulation result in Long time scale under SERVO CONTROL is poor, servo accuracy is low, power failures
The shortcomings that test progress；Even if counterweight still can be sustainedly and stably supplied in the case where test specimen generates compression creep deformation
Payload values required by test specimen, real-time ftercompction, it is ensured that load is steady in a long-term.
Detailed description of the invention
Fig. 1 is a kind of using servo loading, the front knot of the soft rock single shaft creepmeter of mechanical pressure stabilizing in the embodiment of the present invention
Structure schematic diagram；
Fig. 2 is machinery loading device and mechanical stable-pressure device structural schematic diagram in the embodiment of the present invention；
Fig. 3 is a kind of using servo loading, the back side knot of the soft rock single shaft creepmeter of mechanical pressure stabilizing in the embodiment of the present invention
Structure schematic diagram；
Appended drawing reference: 1. mechanical load wheel shafts；2. screw lift；The first bearing plate of 3-1.；The second bearing plate of 3-2.；4.
Reaction frame；5. servo motor loading device；6. host；7. control button；8. pressure stabilizing wheel shaft；9. steel strand wires；10. hook；11. weight
Code.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
For in the prior art: 1) the existing Serve Motor Control testing machine for Rock Under Uniaxial Compression compression creep test is very
It is difficult to guarantee quick response in long-time, compensates error automatically；In addition, this kind of testing machine needs are electrified for a long time use, test favorite
Situations such as outer power-off, will cause test and interrupt, the technical issues of making a big impact to test process and result；And it is 2) mechanical
It controls creep testing machine and uses mechanical load, need manual loading, loading procedure is time-consuming and laborious, uses inconvenience；In addition,
Lever system occupied space is larger, the technical problem of test operation inconvenience.The embodiment of the present invention, which provides, a kind of to be added using servo
It carries, the soft rock single shaft creepmeter of mechanical pressure stabilizing.
Uniaxial compression creep test process mainly includes load and two processes of pressure stabilizing, applies designed size to test specimen first
Payload values, then make load constant using some way, measure the change of test piece deformation amount at any time in the process
Change；When test piece deformation amount almost no longer changes at any time, apply next stage load, then keeps load steady
Fixed, measurement test piece deformation amount changes with time.It so repeats, until rock generates tertiary creep until destroying.
As shown in Figure 1-3, provided in an embodiment of the present invention a kind of using servo loading, the soft rock single shaft creep of mechanical pressure stabilizing
Instrument, including servo motor loading device, servo motor load control unit, machinery loading device and mechanical stable-pressure device；
Servo motor loading device 5 is loaded for being further applied load at creep test initial stage to test specimen in the servo motor
The first bearing plate 3-1 is arranged in the top of device, and the test specimen is placed in the top of first bearing plate；In the present embodiment,
Test is carried out using servo motor in initial stage test specimen loading procedure to be further applied load, and has loading procedure control in the short time accurate
Advantage.
Servo motor loads control unit, turns off or on for controlling servo motor loading device 5, and for compacted
Become test initial stage control the servo motor loading device 5 in a manner of electronic according to certain loading velocity to test specimen be further applied load to
Goal-setting payload values；
Machinery loading device, the screw-threaded shaft elevator 2 including being set to test piece upper part, in the lower part of the screw-threaded shaft elevator 2
Second bearing plate 3-2 is set, and the test specimen is between the first bearing plate 3-1 and the second bearing plate 3-2；Close institute
After stating servo motor loading device, if there is error between test specimen load and target design payload values, the mechanical load
Device controls the screw lift according to the error payload values between the practical bearing load value of test specimen and goal-setting payload values
2 lifting carries out ftercompction, to apply mechanical load to goal-setting payload values to test specimen；
Mechanical stable-pressure device, including the steady of the screw-threaded shaft elevator lifting is connected and can controlled with the screw-threaded shaft elevator
Wheel pressing shaft 8, the pressure stabilizing wheel shaft 8 carry out pressure stabilizing using counterweight counterweight.
In the present embodiment, the machinery loading device further includes mechanical load wheel shaft 1,1 He of mechanical load wheel shaft
The screw-threaded shaft elevator 2 connects, and the lifting that the screw lift can be controlled by shaking the mechanical load wheel shaft carries out
Ftercompction.
In the present embodiment, the mechanical stable-pressure device further includes steel strand wires 9, hook 10, counterweight 11；Steel strand wires 9 are wound
On the pressure stabilizing wheel shaft 8, counterweight is connected by hook 10 and the steel strand wires 9；11 weight of counterweight passes through 2 quilt of screw lift
Amplification certain multiple is applied on the test specimen；
The pressure stabilizing wheel shaft 8 and 1 coaxial linkage of mechanical load wheel shaft, all in accordance with the 2 inside snail of screw-threaded shaft elevator
Worm and gear is mutually twisted to control screw lift 2 and move；
When carrying out pressure stabilizing, institute is determined to the amplification factor of power according to test specimen goal-setting payload values and screw lift
Counterweight weight is needed, to guarantee when the practical bearing load value of test specimen is less than goal-setting payload values, the energy under Weight gravity effect
Enough realize ftercompction to design load value.Corresponding counterbalance mass is calculated, by the counterweight of corrresponding quality via being wrapped in the pressure stabilizing
Steel strand wires on wheel shaft keep load to stablize on pressure stabilizing wheel shaft.
In the present embodiment, the creepmeter further includes test table top, reaction frame 4, and one end fixation of the reaction frame is set
It is placed on the test table top, the other end is fixedly connected with the screw-threaded shaft elevator；
The servo motor loading device, servo motor load control unit are arranged on the experiment table top.
Preferably, in the present embodiment, the servo motor load control unit includes host 6 and servo motor load dress
Set control button 7；When test initial stage test specimen loading procedure starts, passes through and open the servo motor loading device control button
7, start servo motor loading device, in the host 6, goal-setting payload values and loading velocity, institute can be arranged in user
Stating servo motor load control unit can control and be further applied load test specimen to target according to certain loading velocity in a manner of electronic
Set payload values.
In the present embodiment, it in first bearing plate lower part or internal installation pressure sensor, is tried for real-time measurement
The practical bearing load value of part；Axial displacement meter and radial displacement are set between first bearing plate and second bearing plate
Meter, and the axial displacement meter and the radial displacement meter are fixed on test specimen, the axial displacement meter and the radial displacement
Meter is respectively used to the axial direction of real-time measurement test specimen generation, radial strain.
The present invention also provides a kind of soft rock uniaxial static creep test method implementations using servo loading, mechanical voltage stabilizing technique
Example, comprising:
Test specimen is placed between the first bearing plate and the second bearing plate, at creep test initial stage, servo motor load control
Servo motor loading device is opened in unit control processed, and is controlled the servo motor loading device and added in a manner of electronic according to certain
Speed is carried to be further applied load to goal-setting payload values to test specimen；Preferably, control button 7 is opened, mesh is arranged by host 6 in user
Parameters, the servo motor loading devices 5 for controlling test piece lower part such as mark setting payload values, loading velocity are further applied load to goal-setting
Payload values.
Servo motor loads control unit control and closes servo motor loading device；If servo motor loading device is closed
There is error between test specimen load and target design payload values afterwards, for suffered by test specimen after closing servo motor loading device
The issuable changing value of load carries out auxiliary adjustment by test piece upper part morning machinery loading device, and concrete operations are as follows: meter
The error payload values between the practical bearing load value of test specimen and goal-setting payload values are calculated, 1 energy of mechanical load wheel shaft is shaken
The lifting for enough controlling the screw lift 2 carries out ftercompction, until the practical bearing load value of test specimen reaches goal-setting payload values.
It wherein, is Worm Wheel System inside screw lift, come required when reducing manual loading by way of displacement enlargement
The size of power need hand hub edge to generate and be greater than the one of the move distance for the screw rod move distance of certain altitude
Determine multiple (being 240 times in the present embodiment) to be loaded.
After machinery loading device load is completed, pressure stabilizing operation is carried out using mechanical stable-pressure device, specifically: pressure stabilizing wheel shaft
8 are arranged in the back side of creepmeter, are coaxial linkage with mechanical load wheel shaft 1, i.e., power, which is applied on pressure stabilizing wheel shaft and is applied to, adds
Carry wheel shaft on can produce identical effect, be equally according to screw lift inside worm and gear be mutually twisted to control silk
Bar elevator motion, therefore voltage-stabilizing system and mechanical load system have identical amplification factor, which can be by the counterweight of input
Weight expands certain multiple (being 240 times in the present embodiment) and is applied on test specimen.When pressure stabilizing, according to test specimen goal-setting payload values
And screw lift determines required counterweight weight to the amplification factor of power, to guarantee to be less than mesh when the practical bearing load value of test specimen
When mark setting payload values, ftercompction can be realized to design load value under Weight gravity effect.The counterweight 11 of corrresponding quality is passed through
Hung over by the steel strand wires 9 being wrapped on pressure stabilizing wheel shaft keeps load to stablize on pressure stabilizing wheel shaft.
In the present embodiment, right by the pressure sensor, the axial displacement meter and the radial displacement meter
Stress suffered by test specimen and generated axial direction, radial strain are observed in real time, are obtained and are described image, greatly simplifie
Test operation process.
Method provided by the present embodiment is in the case where test specimen generates compression creep deformation, and counterweight can still be held
It is continuous to be supplied stably to payload values required by test specimen.Since the gravity of counterweight is applied to always on pressure stabilizing wheel shaft, via amplification
After be applied on test specimen, when test specimen compression generate certain uniaxial compression deformation of creep at any time, between bearing plate and test specimen
Active force has the trend of reduction.Common creepmeter can generate unloading phenomenon at this time, and test process is caused to be difficult to hold, test knot
Situations such as fruit is inaccurate.But creepmeter provided by the present invention is due to carrying out gravity pressure stabilizing, and mechanical pressure stabilizing using counterweight
Device has the amplification factor of fixed numbers, this makes quality of the balance of system dependent on the counterweight applied.When acting on test specimen
On power when have the tendency that reduction, will cause that mechanical voltage-stabilizing system is uneven, and counterweight can drive pressure stabilizing wheel shaft by gravity
Rotation, loads system, to mending power to initial value is played to reach the stress balance of internal system, realizes and mends with servo
The shortcomings that pressing same effect but get rid of to benefit from electric condition constraint, is more suitable for that test period is long, requires good compacted of stability
Become in test, while compared with traditional servo motor pressure stabilizing, precision increases.Therefore this voltage regulation way can guarantee creep
The stabilization for testing carry out process long-time internal loading numerical value, so that it is guaranteed that the accuracy of test result.Furthermore it may be noted that it is mechanical steady
Pressure internal system needs carry out lubrication oiling work, with guarantee test specimen generate compressive deformation when can timely ftercompction, otherwise because
The too big reason of internal friction leads to ftercompction performance failure.
Claims (7)
1. a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing, which is characterized in that load and fill including servo motor
It sets, servo motor load control unit, machinery loading device and mechanical stable-pressure device；
Servo motor loading device, for being further applied load at creep test initial stage to test specimen, in the servo motor loading device
Top the first bearing plate is set, the test specimen is placed in the top of first bearing plate；
Servo motor loads control unit, turns off or on for controlling servo motor loading device, and for trying in creep
The initial stage control servo motor loading device is tested to be further applied load to target to test specimen according to certain loading velocity in a manner of electronic
Set payload values；
Machinery loading device, the screw-threaded shaft elevator including being set to test piece upper part, the setting the in the lower part of the screw-threaded shaft elevator
Two bearing plates, the test specimen is between first bearing plate and second bearing plate；Close the servo motor load
After device, if there is error between actual loading suffered by test specimen and goal-setting payload values, the machinery loading device is according to examination
Error payload values between the practical bearing load value of part and goal-setting payload values, the lifting for controlling the screw lift carry out
Ftercompction, to apply mechanical load to goal-setting payload values to test specimen；
Mechanical stable-pressure device, the pressure stabilizing wheel including the screw-threaded shaft elevator lifting is connected and can controlled with the screw-threaded shaft elevator
Axis, the pressure stabilizing wheel shaft carry out pressure stabilizing using counterweight counterweight.
2. a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing according to claim 1, which is characterized in that
The machinery loading device further includes mechanical load wheel shaft, and the mechanical load wheel shaft is connected with the screw-threaded shaft elevator, is passed through
The lifting progress ftercompction of the screw lift can be controlled by shaking the mechanical load wheel shaft.
3. a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing according to claim 2, which is characterized in that
The machinery stable-pressure device further includes steel strand wires, hook, counterweight；For steel strands wound on the pressure stabilizing wheel shaft, counterweight passes through extension
Hook is connected with the steel strand wires；Counterweight weight is amplified certain multiple by screw lift and is applied on the test specimen；
The pressure stabilizing wheel shaft and the mechanical load wheel shaft coaxial linkage, all in accordance with worm and gear phase inside the screw-threaded shaft elevator
Mutually occlusion moves to control screw lift；
When carrying out pressure stabilizing, weight needed for being determined according to test specimen goal-setting payload values and screw lift to the amplification factor of power
Code weight can be real under Weight gravity effect to guarantee when the practical bearing load value of test specimen is less than goal-setting payload values
Show ftercompction to design load value；By the counterweight of corrresponding quality via the steel strand wires being wrapped on the pressure stabilizing wheel shaft in pressure stabilizing wheel shaft
Upper holding load is stablized.
4. a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing according to claim 1, which is characterized in that
The creepmeter further includes test table top, reaction frame, and one end of the reaction frame is fixedly installed on the test table top, another
End is fixedly connected with the screw-threaded shaft elevator；
The servo motor loading device, servo motor load control unit are arranged on the experiment table top.
5. a kind of using servo loading, the soft rock single shaft creepmeter of mechanical pressure stabilizing according to claim 1, which is characterized in that
In first bearing plate lower part or internal installation pressure sensor, it to be used for the practical bearing load value of real-time measurement test specimen；Institute
State and axial displacement meter and radial displacement meter be set between the first bearing plate and second bearing plate, and the axial displacement meter and
The radial displacement meter is fixed on test specimen, and the axial displacement meter and the radial displacement meter are respectively used to real-time measurement test specimen
The axial direction of generation, radial strain.
6. it is a kind of using servo loading, the soft rock uniaxial static creep test method of mechanical pressure stabilizing, using any one of claim 1-5 institute
State creepmeter characterized by comprising
Test specimen is placed between the first bearing plate and the second bearing plate, at creep test initial stage, servo motor load control is single
Servo motor loading device is opened in member control, and controls the servo motor loading device in a manner of electronic according to certain load speed
Degree is further applied load to goal-setting payload values to test specimen；
Servo motor loads control unit control and closes servo motor loading device；
If servo motor loading device has error, calculation testing piece after closing between test specimen load and target design payload values
Error payload values between practical bearing load value and goal-setting payload values, institute can be controlled by shaking the mechanical load wheel shaft
The lifting for stating screw lift carries out ftercompction, until the practical bearing load value of test specimen reaches goal-setting payload values；
Counterweight weight needed for being determined according to test specimen goal-setting payload values and screw lift to the amplification factor of power, to guarantee
When the practical bearing load value of test specimen is less than goal-setting payload values, ftercompction can be realized under Weight gravity effect to design lotus
Load value；Load is kept to stablize on pressure stabilizing wheel shaft by hanging over the counterweight of corrresponding quality.
7. a kind of using servo loading, the soft rock uniaxial static creep test method of mechanical pressure stabilizing, feature according to claim 6
Be, by the pressure sensor, the axial displacement meter and the radial displacement meter, to stress suffered by test specimen with
And generated axial direction, radial strain are observed in real time, are obtained and are described image.
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