CN109612840A - For obtaining the experimental provision and method of brittle rock curve in post-peak area and retained strength - Google Patents
For obtaining the experimental provision and method of brittle rock curve in post-peak area and retained strength Download PDFInfo
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
It is a kind of for obtaining the experimental provision and method of brittle rock curve in post-peak area and retained strength, the reaction frame of device using in loading frame outside Combined frame structure, including high rigidity, rigidity/interior loading frame, three loading frames successively combined set；Frame stiffness >=5GN/m is loaded outside high rigidity；By adjusting in rigidity/interior loading frame column quantity and diameter, change in rigidity/interior loading frame rigidity.Method are as follows: prepare rock sample, install displacement sensor；Sample is installed, sample is clamped with displacement-control mode precise alignment, eliminates gap；Displacement sensor is finely tuned to range ability；Vertical stress is applied by main load actuator, measures sample deformation；Sample is loaded to destroying, main load actuator is lockked when displacement reaches threshold value with pressure into the post-peak deformation stage, actuator is loaded by pair and continues to vertical stress；Sample is loaded to retained strength；Master/slave load actuator unloading is controlled, the sample after destroying is removed, saves experimental data.
Description
Technical field
The invention belongs to Rock Mechanics Test technical fields, more particularly to one kind for obtaining brittle rock curve in post-peak area
With the experimental provision and method of retained strength.
Background technique
Deep rock mass is the engineering objects such as underground mining, water power adit digging, petroleum gas, unconventional energy resource exploitation
Natural carrier, engineering excavation make the initial stress state of rock mass change, when the stress in rock reaches the intensity of rock
When, rock occurs to destroy and enter the post-peak deformation stage, and the post-peak deformation feature of rock directly influences surrounding rock failure neck
The size in domain and the form of destruction, this is also a difficult point in ROCK MECHANICS RESEARCH.
Currently, existing Rock Mechanics Test equipment, is essentially all based on the servo that developed the 1960s
Control system carries out load or unload, although can also obtain the curve in post-peak area of rock, the form of curve in post-peak area depends on rock
The brittleness of stone.For non-brittle rock, it can be controlled using axial displacement, and can get the peak of I type stability disruption feature
Curve afterwards.For brittle rock, if also controlled using axial displacement, it is not generally possible to obtain curve in post-peak area, because crisp
The destruction of property rock is non-stable.For this purpose, the experiment of machanics of previous brittle rock can only be controlled using hoop strain, keeping
In the case that hoop strain rate is certain, when deforming into post-peaking phase, loading system must be unloaded, obtained curve in post-peak area
For the curve in post-peak area of II type stability disruption feature, and rigidity is positive rigidity behind the peak of II type curve in post-peak area, this is not rock
Substantive characteristics is experimental facilities under the premise of guarantee rock sample normal dilatancy rate, passes through servo-system and forces to drive
Servo valve regulation back pressure high current amount unloads illusion caused by actuator means.
In the 1960s to during the eighties, international correlation scholar researched and developed a variety of rigid Rock Mechanics Tests
Equipment；But some equipment can only carry out uniaxial compression experiment, some equipment does not have enough dependent variables to reach the residual of rock
Stay intensity, some equipment can not overall process all use axial displacement control load, experimental result also occurs bent behind II type peak once in a while
Line.
For the rigidity of Rock Mechanics Test equipment, the damage -form of rock is not only influenced, and behind influence rock peak
Load-deformation curve.In 1997, scholar Van Mier etc. carried out experimental machine rigidity and has answered stress-behind concrete sample peak
The research that varied curve influences, however, only having collected tying as a result, these can not be based on for limited quantity since experiment condition is limited
Fruit is reasonably compared.In 2017, the method that scholar Xu Y and Cai M uses numerical simulation carried out grinding for this respect
Study carefully, conclusion is that the rigidity of equipment influences the load-deformation curve behind rock peak really.
Therefore, it in order to preferably study the whole English teaching and retained strength of brittle rock, needs to design a kind of tool
There is the Rock Mechanics Test equipment of specific super rigidity and variable rigidity, to avoid the elastic potential energy release stored in experimental facilities
Influence to the generation of brittle rock post-peak deformation, while the retained strength that there is sufficiently large deflection to reach brittle rock.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of strong for obtaining brittle rock curve in post-peak area and residual
The experimental provision and method of degree can generate brittle rock post-peak deformation to avoid the elastic potential energy release stored in experimental facilities
Influence, while the retained strength that there is sufficiently large deflection to reach brittle rock, which possesses specific super rigid
Degree and variable rigidity, and then influence of the rigidity of experimental facilities to rock curve in post-peak area can be studied.
To achieve the goals above, the present invention adopts the following technical scheme: it is a kind of for obtaining brittle rock curve in post-peak area
With the experimental provision of retained strength, including reaction frame, pedestal, main load actuator, secondary load actuator and pressure chamber's coaster；
The reaction frame is fixedly mounted with installation on the base；The main load actuator is vertically installed at the top of reaction frame, and main load is made
The piston rod of dynamic device installs force sensor downward, in the piston rod end of main load actuator；The secondary load actuator is perpendicular
It is directly mounted on reaction frame bottom, the piston rod of pair load actuator upward, is installed in the piston rod end of secondary load actuator
There is cushion block plummer；The longitudinal center line of the main load actuator and secondary load actuator coincides；The reaction frame
Middle part is pressure chamber, and pressure chamber's coaster transports rock sample by way of pressure chamber, by pressure chamber's coaster；The reaction frame
Using loading frame in loading frame in loading frame outside Combined frame structure, including high rigidity, rigidity and rigidity；It is described rigid
Property in loading frame be located in rigidity inside loading frame, loading frame, which is located at outside high rigidity, in rigidity loads lower portion.
The outer loading frame of the high rigidity includes the outer loading frame top beam of high rigidity, high rigidity load framework bottom beam and height outside
Upright of frame is loaded outside rigidity；The quantity that upright of frame is loaded outside the high rigidity is four, the outer loading frame of four high rigidities
Column is evenly arranged on outside the outer loading frame top beam of high rigidity and high rigidity and loads between framework bottom beam；The outer loading frame of the high rigidity
Column uses square column or circular abutment；Upright of frame and the outer loading frame top beam of high rigidity and height are loaded outside the high rigidity
It loads outside rigidity and is attached by high-strength bolt between framework bottom beam；The high rigidity of the outer loading frame of the high rigidity is additional
Carrying frame top beam, high rigidity, load upright of frame is all made of steel alloy forging technology system outside for load framework bottom beam and high rigidity outside
It makes；Rigidity >=5GN/m of the outer loading frame of the high rigidity, the bearing capacity of the outer loading frame of high rigidity be 9000kN~
12000kN。
In the rigidity loading frame include loading frame top beam in rigidity, in rigidity in loading frame bottom beam and rigidity plus
Carry upright of frame；The quantity of loading frame column is four or the six roots of sensation, loading frame in four or six roots of sensation rigidity in the rigidity
Column is evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column is adopted in the rigidity
With square column or circular abutment；Frame is loaded in loading frame column and loading frame top beam in rigidity and rigidity in the rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam, rigidity in the rigidity of loading frame in the rigidity
Loading frame column is all made of alloy steel making in middle loading frame bottom beam and rigidity；The bearing capacity of loading frame in the rigidity
For 5000kN~8000kN；By adjusting quantity, side length or the diameter of loading frame column in the rigidity, to being loaded in rigidity
The rigidity of frame is changed.
In the rigidity loading frame include loading frame top beam in rigidity, in rigidity loading frame bottom beam and rigidity in plus
Carry upright of frame；The quantity of loading frame column is four or the six roots of sensation, loading frame in four or six roots of sensation rigidity in the rigidity
Column is evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column is adopted in the rigidity
With square column or circular abutment；Frame is loaded in loading frame column and loading frame top beam in rigidity and rigidity in the rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam, rigidity in the rigidity of loading frame in the rigidity
Loading frame column is all made of high strength alumin ium alloy or alloy steel making in interior loading frame bottom beam and rigidity；Load in the rigidity
The bearing capacity of frame is 2000kN~5000kN；By adjusting quantity, side length or the diameter of loading frame column in the rigidity,
The rigidity of loading frame in rigidity is changed.
The main load actuator and secondary load actuator use continuous control loading method.
Whole axis is carried out to rock sample by the reaction frame and main load actuator and secondary load actuator cooperation
To displacement/Deformation control load.
It is a kind of for obtaining the experimental method of brittle rock curve in post-peak area and retained strength, using described for obtaining
The experimental provision of brittle rock curve in post-peak area and retained strength, includes the following steps:
Step 1: rock sample is prepared, and two LVDT displacement sensors, and two are installed on the surface of rock sample
LVDT displacement sensor is arranged using orthogonal manner；
Step 2: the rock sample prepared is placed on cushion block plummer；
Step 3: main load actuator movement is driven with displacement-control mode, until completing the precise alignment of rock sample
It clamps, eliminates loading frame in rock sample and cushion block plummer, rigidity, the gap in rigidity between loading frame；
Step 4: two LVDT displacement sensors on rock sample surface are finely adjusted, two LVDT displacement sensings are made
Device is in range ability；
Step 5: main load actuator is controlled in a manner of axial displacement/Deformation control and applies vertical stress, according to preset
Stress increment is loaded, and passes through the change both vertically and horizontally of two LVDT displacement sensor rock samples
Shape；
Step 6: load rock sample, into the post-peak deformation stage, observes LVDT displacement sensor and power sensing to destroying
The data of device measurement lock main load actuator, and load actuator by pair and continue to apply when displacement reaches threshold value with pressure
Add vertical stress；
Step 7: load rock sample to retained strength；
Step 8: the rock sample after destruction is removed, is saved by the main load actuator of control and secondary load actuator unloading
Experimental data.
Beneficial effects of the present invention:
The experimental provision and method for being used to obtain brittle rock curve in post-peak area and retained strength of the invention, can be to avoid reality
It tests the elastic potential energy stored in equipment and discharges the influence generated to brittle rock post-peak deformation, while there is sufficiently large deflection
Reach the retained strength of brittle rock, which possesses specific super rigidity and variable rigidity, and then can research experiment set
Influence of the standby rigidity to rock curve in post-peak area.
The experimental provision and method for being used to obtain brittle rock curve in post-peak area and retained strength of the invention, is sensed by power
Device feedback pressure signal feeds back deformation signal by LVDT displacement sensor, need to only motor servo driver be cooperated to can be realized
The continuous control of main load actuator and secondary load actuator.
The experimental provision and method for being used to obtain brittle rock curve in post-peak area and retained strength of the invention, reaction frame are adopted
With Combined frame structure, the whole axial displacement control load to brittle rock sample is realized, ensure that post-failure rock
Destroying is stability disruption, and the curve in post-peak area of acquisition is resultant stress-strain I type curve in post-peak area, and it is crisp that experimental result can be used for rock
Property index determination, rockburst risk assessment, rock mass support design.
The experimental provision and method for being used to obtain brittle rock curve in post-peak area and retained strength of the invention, due to counter-force frame
Frame use Combined frame structure, make each loading frame that can independently work, especially in rigidity loading frame and
Loading frame can according to actual needs be changed rigidity in rigidity, be the rigidity of research experiment equipment to bent behind rock peak
The influence of line provides unique experiment porch.
The experimental provision and method for being used to obtain brittle rock curve in post-peak area and retained strength of the invention, passes through main load
Actuator and secondary load actuator carry out the coherent load of substep, and 4%~5% compressive strain can be realized to rock sample, is
The correct retained strength for obtaining brittle rock provides possibility, and the destruction area of country rock provides after can also excavating for simulation deep rock mass
Design parameter.
Detailed description of the invention
Fig. 1 is of the invention a kind of for obtaining facing for the experimental provision of brittle rock curve in post-peak area and retained strength
Figure；
Fig. 2 is of the invention a kind of for obtaining the side view of the experimental provision of brittle rock curve in post-peak area and retained strength
Figure；
Fig. 3 is the assembling schematic diagram of loading frame and loading frame in rigidity in rigidity of the invention；
In figure, 1-reaction frame, 2-pedestals, 3-main load actuator, 4-secondary load actuator, 5-pressure chambers are slided
Vehicle, 6-force snesors, 7-cushion block plummers, 8-rock samples, the outer loading frame of 9-high rigidities load frame in 10-rigidity
Frame, loading frame in 11-rigidity, 12-LVDT displacement sensors.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figures 1 to 3, a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength including anti-
Power frame 1, pedestal 2, main load actuator 3, secondary load actuator 4 and pressure chamber's coaster 5；The reaction frame 1 is fixedly mounted with installation
On the base 2；The main load actuator 3 is vertically installed at the top of reaction frame 1, the piston rod of main load actuator 3 downward,
Force sensor 6 is installed in the piston rod end of main load actuator 3；The secondary load actuator 4 is vertically installed at counter-force frame
1 bottom of frame, the piston rod of pair load actuator 4 are equipped with cushion block plummer upward, in the piston rod end of secondary load actuator 4
7；The longitudinal center line of the main load actuator 3 and secondary load actuator 4 coincides；The middle part of the reaction frame 1 is pressure
Power room, pressure chamber's coaster 5 transport rock sample 8 by way of pressure chamber, by pressure chamber's coaster 5；The reaction frame 1 uses
Loading frame 9 outside Combined frame structure, including high rigidity, loading frame 11 in loading frame 10 and rigidity in rigidity；It is described
Loading frame 11 is located in rigidity inside loading frame 10 in rigidity, and loading frame 10 is located at the outer loading frame of high rigidity in rigidity
Inside 9.
The outer loading frame 9 of the high rigidity include the outer loading frame top beam of high rigidity, load outside high rigidity framework bottom beam and
Upright of frame is loaded outside high rigidity；The quantity that upright of frame is loaded outside the high rigidity is four, and frame is loaded outside four high rigidities
Column is erected to be evenly arranged on outside the outer loading frame top beam of high rigidity and high rigidity between load framework bottom beam；Frame is loaded outside the high rigidity
It erects column and uses square column or circular abutment；Load outside the high rigidity upright of frame and the outer loading frame top beam of high rigidity and
It loads outside high rigidity and is attached by high-strength bolt between framework bottom beam；The high rigidity of the outer loading frame 9 of the high rigidity
Load upright of frame outside framework bottom beam and high rigidity is loaded outside outer loading frame top beam, high rigidity is all made of steel alloy forging technology
Manufacture；Rigidity >=5GN/m of the outer loading frame 9 of the high rigidity, the bearing capacity of the outer loading frame 9 of high rigidity be 9000kN~
12000kN。
Loading frame 10 includes loading frame top beam in rigidity, in rigidity in loading frame bottom beam and rigidity in the rigidity
Loading frame column；The quantity of loading frame column is four or the six roots of sensation in the rigidity, loads frame in four or six roots of sensation rigidity
Column is erected to be evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column in the rigidity
Using square column or circular abutment；In the rigidity loading frame column with loaded in loading frame top beam and rigidity in rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam in the rigidity of loading frame 10 in the rigidity,
Loading frame column is all made of alloy steel making in loading frame bottom beam and rigidity in rigidity；Loading frame 10 in the rigidity
Bearing capacity is 5000kN~8000kN；By adjusting quantity, side length or the diameter of loading frame column in the rigidity, to rigidity
The rigidity of middle loading frame 10 is changed.
Loading frame 11 includes loading frame top beam in rigidity, in rigidity in loading frame bottom beam and rigidity in the rigidity
Loading frame column；The quantity of loading frame column is four or the six roots of sensation, four or the interior load frame of six roots of sensation rigidity in the rigidity
Column is erected to be evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column in the rigidity
Using square column or circular abutment；Loading frame column and load in loading frame top beam in rigidity and rigidity in the rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam in the rigidity of loading frame 11 in the rigidity,
Loading frame column is all made of high strength alumin ium alloy or alloy steel making in loading frame bottom beam and rigidity in rigidity；In the rigidity
The bearing capacity of loading frame 11 is 2000kN~5000kN；By adjusting quantity, the side length of loading frame column in the rigidity
Or diameter, the rigidity of loading frame 11 in rigidity is changed.
The main load actuator 3 uses continuous control loading method with secondary load actuator 4.
Rock sample 8 is carried out entirely by the reaction frame 1 and main load actuator 3 and secondary load actuator 4 cooperation
Journey axial displacement/Deformation control load.
Upright of frame is loaded in embodiment below, outside high rigidity and uses square column, and the outer loading frame 9 of high rigidity is held
Load power is 9000kN；The quantity of loading frame column is four in rigidity, and loading frame column uses circular abutment in rigidity, just
Property in loading frame 10 bearing capacity be 5000kN；The quantity of loading frame column is four in rigidity, loading frame in rigidity
Column uses circular abutment, and the bearing capacity of loading frame 11 is 2000kN in rigidity.
It is a kind of for obtaining the experimental method of brittle rock curve in post-peak area and retained strength, using described for obtaining
The experimental provision of brittle rock curve in post-peak area and retained strength, includes the following steps:
Step 1: rock sample 8 is prepared, and two LVDT displacement sensors 12, and two are installed on the surface of rock sample 8
A LVDT displacement sensor 12 is arranged using orthogonal manner；In the present embodiment, rock sample 8 is brittle rock, rock examination
The size of sample 8 is φ 50mm × 100mm；
Step 2: the rock sample 8 prepared is placed on cushion block plummer 7；
Step 3: driving main load actuator 3 to act with displacement-control mode, until completing the accurate right of rock sample 8
Middle clamping, eliminate loading frame 11 in rock sample 8 and cushion block plummer 7, rigidity, in rigidity between loading frame 10 between
Gap；
Step 4: being finely adjusted two LVDT displacement sensors 12 on 8 surface of rock sample, passes two LVDT displacements
Sensor 12 is in range ability；
Step 5: main load actuator 3 is controlled in a manner of axial displacement/Deformation control and applies vertical stress, according to default
Stress increment loaded, and vertical direction and the level side of rock samples 8 are measured by two LVDT displacement sensors 12
To deformation；
Step 6: load rock sample 8 to destruction observes LVDT displacement sensor 12 and power into the post-peak deformation stage
The data that sensor 6 measures lock main load actuator 3, and load actuator by secondary when displacement reaches threshold value with pressure
4 continue to vertical stress；
Step 7: load rock sample 8 to retained strength；
Step 8: the main load actuator 3 of control and secondary load actuator 4 unload, and the rock sample 8 after destruction is removed,
Save experimental data.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (7)
1. a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength, it is characterised in that: including counter-force frame
Frame, pedestal, main load actuator, secondary load actuator and pressure chamber's coaster；The reaction frame is fixedly mounted with installation on the base；Institute
Main load actuator is stated to be vertically installed at the top of reaction frame, the piston rod of main load actuator downward, in main load actuator
Piston rod end install force sensor；The secondary load actuator is vertically installed at reaction frame bottom, pair load actuation
The piston rod of device is equipped with cushion block plummer upward, in the piston rod end of secondary load actuator；The main load actuator with
The longitudinal center line of pair load actuator coincides；The middle part of the reaction frame be pressure chamber, pressure chamber's coaster by way of
Pressure chamber transports rock sample by pressure chamber's coaster；The reaction frame is using outside Combined frame structure, including high rigidity
Loading frame in loading frame and rigidity in loading frame, rigidity；Loading frame is located at loading frame in rigidity in the rigidity
Inside, loading frame, which is located at outside high rigidity, in rigidity loads lower portion.
2. it is according to claim 1 a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength,
Be characterized in that: the outer loading frame of the high rigidity include the outer loading frame top beam of high rigidity, load outside high rigidity framework bottom beam and
Upright of frame is loaded outside high rigidity；The quantity that upright of frame is loaded outside the high rigidity is four, and frame is loaded outside four high rigidities
Column is erected to be evenly arranged on outside the outer loading frame top beam of high rigidity and high rigidity between load framework bottom beam；Frame is loaded outside the high rigidity
It erects column and uses square column or circular abutment；Load outside the high rigidity upright of frame and the outer loading frame top beam of high rigidity and
It loads outside high rigidity and is attached by high-strength bolt between framework bottom beam；Outside the high rigidity of the outer loading frame of the high rigidity
Load upright of frame outside framework bottom beam and high rigidity is loaded outside loading frame top beam, high rigidity is all made of steel alloy forging technology system
It makes；Rigidity >=5GN/m of the outer loading frame of the high rigidity, the bearing capacity of the outer loading frame of high rigidity be 9000kN~
12000kN。
3. it is according to claim 1 a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength,
Be characterized in that: loading frame includes loading frame top beam in rigidity, in rigidity in loading frame bottom beam and rigidity in the rigidity
Loading frame column；The quantity of loading frame column is four or the six roots of sensation in the rigidity, loads frame in four or six roots of sensation rigidity
Column is erected to be evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column in the rigidity
Using square column or circular abutment；In the rigidity loading frame column with loaded in loading frame top beam and rigidity in rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam in the rigidity of loading frame in the rigidity, just
Loading frame column is all made of alloy steel making in loading frame bottom beam and rigidity in property；The carrying of loading frame in the rigidity
Power is 5000kN~8000kN；By adjusting quantity, side length or the diameter of loading frame column in the rigidity, add in rigidity
The rigidity for carrying frame is changed.
4. it is according to claim 1 a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength,
Be characterized in that: loading frame includes loading frame top beam in rigidity, in rigidity in loading frame bottom beam and rigidity in the rigidity
Loading frame column；The quantity of loading frame column is four or the six roots of sensation, four or the interior load frame of six roots of sensation rigidity in the rigidity
Column is erected to be evenly arranged in rigidity in loading frame top beam and rigidity between loading frame bottom beam；Loading frame column in the rigidity
Using square column or circular abutment；Loading frame column and load in loading frame top beam in rigidity and rigidity in the rigidity
It is attached by high-strength bolt between frame bottom beam；Loading frame top beam in the rigidity of loading frame in the rigidity, just
Loading frame column is all made of high strength alumin ium alloy or alloy steel making in loading frame bottom beam and rigidity in property；Add in the rigidity
The bearing capacity for carrying frame is 2000kN~5000kN；By adjusting the quantity, side length of loading frame column in the rigidity or straight
Diameter is changed the rigidity of loading frame in rigidity.
5. it is according to claim 1 a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength,
Be characterized in that: the main load actuator and secondary load actuator are using continuous control loading method.
6. it is according to claim 1 a kind of for obtaining the experimental provision of brittle rock curve in post-peak area and retained strength,
It is characterized by the reaction frame and main load actuator and secondary load actuator cooperation carries out whole axis to rock sample
To displacement/Deformation control load.
7. it is a kind of for obtaining the experimental method of brittle rock curve in post-peak area and retained strength, it uses described in claim 1
For obtaining the experimental provision of brittle rock curve in post-peak area and retained strength, it is characterised in that include the following steps:
Step 1: rock sample is prepared, and two LVDT displacement sensors, and two LVDT are installed on the surface of rock sample
Displacement sensor is arranged using orthogonal manner；
Step 2: the rock sample prepared is placed on cushion block plummer；
Step 3: driving main load actuator movement with displacement-control mode, until the precise alignment for completing rock sample clamps,
Eliminate loading frame in rock sample and cushion block plummer, rigidity, the gap in rigidity between loading frame；
Step 4: two LVDT displacement sensors on rock sample surface are finely adjusted, keep two LVDT displacement sensors equal
In range ability；
Step 5: main load actuator is driven to apply vertical stress in a manner of axial displacement/Deformation control, according to preset stress
Increment is loaded, and passes through the deformation both vertically and horizontally of two LVDT displacement sensor rock samples；
Step 6: load rock sample is to destroying, and into the post-peak deformation stage, observes LVDT displacement sensor and force snesor is surveyed
The data of amount lock main load actuator, and load actuator by pair and continue to hang down when displacement reaches threshold value with pressure
Normal stress；
Step 7: load rock sample to retained strength；
Step 8: the rock sample after destruction is removed, saves experiment by the main load actuator of control and secondary load actuator unloading
Data.
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| CN110411842A (en) * | 2019-08-01 | 2019-11-05 | 东北大学 | The true triaxial experimental provision and method of crisp rock curve in post-peak area and retained strength can be obtained |
| CN113138116A (en) * | 2021-04-01 | 2021-07-20 | 北京科技大学 | Rigid-flexible rock pressure testing machine device for teaching demonstration |
| CN114441323A (en) * | 2021-12-24 | 2022-05-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Double-acting-cylinder coordinated loading test bed and coordinated loading test method |
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