Rock double linkage three axis rheogeniometer
The present invention relates to the moving rock triaxial rheometer of a kind of duplex, this instrument is applicable to: soft rock, the rheological characteristics of pan soil under different stress conditions.Adopt advanced technical combinations such as servocontrol, ball-screw and hydraulic pressure, can automatic voltage regulation, write down stress-displacement curve, temperature duration curve automatically.This equipment can be realized the three axis creep test of identical axial compression, different confined pressures.
In all kinds of engineering constructions, as the construction of the storage of oil development, nuke rubbish and Three Gorges Projects and development of the West Regions etc., the engineering problem of the rock-soil material generation rheology that is run into is more and more, many scholars inquire into the phenomenon and the problem of coming the various and time correlation that analytical calculation occurs with the rock mass rheological theory in handling engineerings such as underground chamber, side slope, the dam dam foundation, so the rheological characteristics theory of rock mass has attracted the concern of numerous researchers as the key issue in the geotechnical engineering problems.Soft rock engineering rheology problem just was suggested as global problem from the sixties in 20th century, was the difficult point and the focus of current tackling of key scientific and technical problems and engineering practice.In the past few decades, vast researcher both domestic and external has carried out number of research projects to the rheology problem of soft rock engineering.
In the characteristic that soft rock shows under the mechanical environment of complexity, large deformation and non-linear high current become characteristic and show particularly outstandingly, and the longer duration of engineering rheology generation.Up to the present, the non-linear rheology The Characteristic Study of soft rock achievement is not grasped its deformation failure rule as yet comprehensively, the base plate distension appears in many soft-rock tunnels in process of production to be risen, and crushes, ftractures, broken so that inbreak phenomenon.
This equipment provides new experimental technique for the rheological characteristics of research Chinese deep underground works soft rock (water conservancy, mine, oil, nuke rubbish bank), this equipment of this shows not only has the value of important rheological test research, and it is extremely wide also to have actual application prospect.
Summary of the invention
The objective of the invention is to be to provide a kind of rock double linkage three axis rheogeniometer, can realize the triaxial rheology test of identical axial compression, different confined pressures, this instrument versatility is good, simple in structure, reliability is high, realization is easy.For three axis creep test, can realize that not only axial compression is identical, during test the confined pressure of two samples can be identical, also can be different, reach the speed of accelerating test, can also reduce experimentation cost.
To achieve these goals, the technical solution adopted for the present invention to solve the technical problems is: increase a web member between two triaxial cells, make one of them sample rheology enter tertiary creep during the stage, this Structure Conversion is become force transferring structure, guarantee that the sample of another one triaxial cell can also carry on test.
According to the test needs, can realize the rheological test of the rheological test of two identical axial compressions, confined pressure or identical axial compression, different confined pressures, can measure axial deformation and transversely deforming that sample takes place in the rheological test process, realize the real-time collection of data by sensor and data acquisition system (DAS).
This testing tool comprises: axial pressure system, confined pressure system, servo-control system, data acquisition system (DAS) etc. partly constitute.The annexation of this instrument is:
Loading frame links to each other by circular interface with pressure transducer, and its effect is to measure the axial compression that sample applies;
Pressure transducer links to each other with the triaxial cell, gathers in real time and the axial force of controlling in the process of the test that applies.
Displacement transducer and the axial force oil cylinder piston of exerting oneself links to each other by circular interface, and its effect is the axial creeping displacement of measuring in the rheology process;
Two triaxial cells link to each other with base with loading frame respectively, its effect is seal sample and applies xial feed to sample, two triaxial cells join by oil pipe respectively with confined pressure servo loading system, axial servo loading system, and confined pressure servo loading system, axial servo loading system are connected by cable with the confined pressure servomotor respectively.
Base links to each other with the triaxial cell, and its effect is to lay the triaxial cell;
Base with axially go out power cylinder and link to each other, its effect provides axle pressure;
Be connected by metal connecting piece between two triaxial cells; Guarantee that two triaxial cells bear identical axial stress;
Axially go out power cylinder and link to each other with axial servo loading system and servomotor, its effect provides constant axial stress;
The triaxial cell links to each other by circular oil pipe with confined pressure servo loading system and servomotor, and its effect provides constant confined pressure;
Axially servomotor links to each other by cable with controller and computing machine, and its effect is that the axial stress in the control process of the test is constant;
The confined pressure servomotor links to each other by cable with controller and computing machine, and its effect is that the adjusting confined pressure in the control process of the test makes its maintenance constant;
Displacement transducer links to each other by cable with computing machine, and its effect is the rheology displacement in the real time record rheology process;
Pressure transducer links to each other with computing machine by cable, and its effect is axial stress and the confined pressure in the real time record rheological test process;
The triaxial cell links to each other with sample, and its effect provides the space that sample is installed, and guarantees applying of axial compression and confined pressure;
Cushion block is connected with the triaxial cell, and its effect is to guarantee that triaxial cell's warranty test machine power transmission is even;
Transverse strain meter and sample close proximity, its effect are the transversely deformings of measuring sample;
The size that transverse strain meter clip is used to regulate the transverse strain meter with contact;
Sample links to each other with the transverse strain meter with the triaxial cell, is the measured main body of test;
The present invention includes: experimental principle, Data Acquisition and Conversion System (DACS) function.Carry out rheological test by two samples rock being carried out under the same axial pressure, the confined pressure of two samples can be the same or different, and writes down axial stress-time curve in the process of the test respectively, axial displacement-time curve, and real time record environment temperature.
The present invention compared with prior art has the following advantages and effect:
1. experimental system both can realize identical confined pressure, also can realize the moving combination of the duplex rheological test of different confined pressures.
2. can control the test temperature of sample in the process of the test.
3. system's versatility is good, reliability is high, precision is high, and can shorten the test period, saves experimentation cost.
Description of drawings
Fig. 1 is a kind of rock double linkage three axis rheogeniometer structural representation.
Fig. 2 is a kind of structural representation of triaxial cell.
This structure comprises: the 5a of triaxial cell, transverse strain meter 13, transverse strain meter clip 14 and cushion block 12.
Fig. 3 is a kind of cross section structure synoptic diagram of triaxial cell.
This structure comprises: transverse strain meter clip 14, transverse strain meter chain 17, transverse strain meter clip 16 and sample 15.
Wherein: the 1-loading frame; The 2-pressure transducer; The 3-displacement transducer; 4-triaxial cell web member (metalwork); 5a, 5b-triaxial cell; The 6-base; The 7-oil cylinder piston of axially exerting oneself; The axial servo loading system of 8a-; 8b-confined pressure servo loading system; 8c-confined pressure servo loading system; 9a-axial compression servomotor; 9b, 9c-confined pressure servomotor; 10a-axle pressure controller; 10b, 10c-confined pressure controller; The 11-computing machine; 12-triaxial cell cushion block; 13-transverse strain meter; 14-transverse strain meter clip; The 15-sample; 16-triaxial cell gum cover barrel; 17-transverse strain meter chain
According to Fig. 1, Fig. 2 and Fig. 3, this tester partly is made up of the special-purpose 5a of triaxial cell, 5b, pressure transducer 2, displacement transducer 3, axial servo loading system 8a, confined pressure servo loading system 8b and computing machine 11 etc.
The basic connection relationship of this tester is:
Loading frame 1 links to each other with pressure transducer 2, measures the axial force that sample applies, and measuring accuracy is 2N
Pressure transducer 2 is connected with the 5a of triaxial cell, gathers in real time and the axial force of controlling in the process of the test that applies;
The 5b of triaxial cell links to each other with tester base 6, and tester base 6 reaches the oil cylinder piston 7 of axially exerting oneself mutually with displacement transducer and links to each other, and its effect is the axial displacement that takes place in the test sample process.
The 5a of triaxial cell is connected by metalwork 4 with the 5b of triaxial cell, and its effect is to guarantee that (5a 5b) bears identical axial force in loading procedure in two triaxial cells;
The 5a of triaxial cell is connected with the 5b of triaxial cell, flow graph loading frame 1 and base 6 respectively, and its effect is seal sample and applies xial feed to sample, applies axial force by axially going out power cylinder, and axially pad 12 is according to the size processing of sample;
Axial cushion block 12 is housed in the 5a of triaxial cell, 5b, sample 15 is put into build-in test, the space that provides sample to install, and guarantee applying of axial pressure and confined pressure, the cylinder that the 5a of triaxial cell, 5b pressurize to sample 15 by hydraulic oil;
The 5b of triaxial cell, 5a and confined pressure servo loading system 8b, confined pressure servo loading system 8c join respectively with by oil pipe, confined pressure servo loading system 8b, confined pressure servo loading system 8c are connected by cable with confined pressure servomotor 9b, confined pressure servomotor 9c respectively, and its effect is to apply constant confining pressure to sample;
Axially servo loading system 8a is respectively with axial servomotor 9a, axially the oil cylinder piston 7 of exerting oneself links to each other, and its effect is to guarantee stablizing of axial force.
Axle pressure controller 10a, confined pressure controller 10b, 10c link to each other with computing machine 11 with axial servomotor 9a, confined pressure servomotor 9b, 9c respectively, and its effect is a size of controlling axle pressure and confined pressure by computing machine 11.
Transverse strain meter 13 joins with sample 15 cross sections, and its effect is the transversely deforming of measuring sample;
According to Fig. 2 as can be known, the 5a of triaxial cell links to each other with triaxial cell's cushion block 12 with transverse strain meter 13 respectively, and transverse strain meter 13 links to each other with transverse strain meter clip 14, and its effect is the sample transversely deforming of testing experiment process.
According to Fig. 3 as can be known, triaxial cell's gum cover barrel 16 links to each other with transverse strain meter chain 17, in triaxial cell's gum cover barrel 16 sample 15 is housed, transverse strain meter chain 17 links to each other with transverse strain meter clip 14, and its effect is to guarantee that the gum cover of sample closely contacts with transverse strain meter chain.
The triaxial cell: size designs according to specimen size requirement, and domestic testing machine factory can produce;
Servomotor: MSMD082P1 series
Controller: German EDC220 series
Computing machine: Dell
Displacement transducer: MTS RS series
Pressure transducer: HBM Load Cell Z6
Loading frame: domestic testing machine factory can produce
Axial servo loading system: domestic testing machine factory can produce
Confined pressure, servo loading system: domestic testing machine factory can produce
Axial servomotor: MSMD082P1 series
Confined pressure servomotor: MSMD082P1 series
Above critical piece all can be from market purchasing or processing.
According to shown in Figure 1, test sample put into 5a of triaxial cell and 5b, and put into axial pad 12; The application test machine frame applies certain axial compression and confined pressure to sample 15, relevant informations such as strain in application displacement transducer 3 and the pressure transducer 2 acquisition test processes and stress.
Above technical scheme has realized the test of rock double linkage three axis rheogeniometer rock soil medium rheological characteristics, and the measurement cost is low and test accuracy is high, has future in engineering applications widely.