CN112213186A - Axial underwater force measuring system device of dynamic triaxial apparatus - Google Patents
Axial underwater force measuring system device of dynamic triaxial apparatus Download PDFInfo
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- CN112213186A CN112213186A CN202010892224.3A CN202010892224A CN112213186A CN 112213186 A CN112213186 A CN 112213186A CN 202010892224 A CN202010892224 A CN 202010892224A CN 112213186 A CN112213186 A CN 112213186A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
An axial underwater force measurement system device of a dynamic triaxial apparatus comprises: the frame comprises a supporting seat and a portal frame; the axial loading mechanism is arranged between the portal frame beam and the supporting seat and comprises an axial loading rod assembly, a pressure chamber and a sample loading device, wherein the lower end part of the axial loading rod assembly is inserted into a sealed inner cavity of the pressure chamber and then fixedly mounted with the sample loading device; the pressure chamber is arranged on the rack below the axial loading rod assembly, and the top of the pressure chamber is connected with the lifting end of the lifting mechanism; the sample loading device comprises a sample clamping part and a lifting part; the pressure chamber lifting mechanism is arranged at the top of the rack and comprises a lifting cylinder and a lifting rod; and the data acquisition mechanism comprises a top load sensor, an underwater load sensor, a data acquisition line and a controller. The invention has the beneficial effects that: the influence of the additional force of the functional membrane generated by the sealing requirement of the pressure chamber between the top cover of the pressure chamber and the loading piston rod when the axial load sensor is used for measuring is eliminated.
Description
Technical Field
The invention relates to an axial force measuring system of a dynamic triaxial apparatus in geotechnical engineering, in particular to optimized transformation of an axial underwater force measuring system device of the dynamic triaxial apparatus.
Background
The similar domestic test instruments are basically the same as the existing instruments in the axial load collection mode, in the test process, because the axial sensor is arranged outside the closed pressure chamber, the control force is applied to the test soil sample through the axial actuating piston, the influence of the additional force of the functional membrane is necessarily generated due to the sealing requirement of the pressure chamber, and the additional force cannot be accurately eliminated from the display value of the load sensor, so that the test precision and the test result are influenced.
In order to avoid the phenomenon, the similar instruments imported from abroad at present are gradually installed in the pressure chamber by using the reliable underwater sensor to solve the problem, but the similar instruments imported from abroad have smaller space due to the influence of price, the size of a sample which can be made is very limited, and the requirement of the scientific research experiment on the large size cannot be met, so that the existing problems are solved on the existing instruments in software or hardware, the accuracy and the credibility of the test are improved, and the scientific research utilization rate of the existing instruments is effectively improved.
Therefore, the underwater axial force transducer which can be arranged in the pressure chamber is reconstructed and optimally designed by combining the defects of the similar domestic test instruments in the axial load acquisition mode and the advantages of the load acquisition mode in the pressure chamber, so that the influence of the additional force of the functional membrane between the upper cover of the pressure chamber and the loading piston rod is eliminated, and the acquisition precision of the axial force data of the test is improved.
Disclosure of Invention
The invention aims to solve the technical problems of the existing dynamic triaxial apparatus, and provides an axial force measuring system which can avoid the interference of additional nonlinear stress generated by an apparatus function membrane generated outside a pressure chamber by a sensor so as to solve the problems in the prior art.
The invention relates to an axial underwater force measuring system device of a dynamic triaxial apparatus, which is characterized by comprising:
the gantry comprises a support seat and a gantry frame, wherein the bottom of the gantry frame is arranged on the support seat, and a through hole is formed in an upper cross beam of the gantry frame and used for mounting a lifting mechanism;
the axial loading mechanism is arranged between the portal frame beam and the supporting seat and comprises an axial loading rod assembly, a pressure chamber and a sample loading device, wherein the lower end part of the axial loading rod assembly is inserted into a sealed inner cavity of the pressure chamber and then fixedly mounted with the sample loading device; the pressure chamber is arranged on the rack below the axial loading rod assembly, the top of the pressure chamber is connected with the lifting end of the lifting mechanism, and the bottom of the pressure chamber is provided with a water through hole for injecting water into the pressure chamber; the sample loading device comprises a sample clamping part and an axial actuator, the sample clamping part is arranged in the pressure chamber and is coaxial with the axial loading rod assembly, and the bottom of the sample clamping part penetrates out of the bottom of the pressure chamber and is connected with the axial actuator for applying axial force to indirectly adjust the clamping degree of the sample clamping part on the sample;
the pressure chamber lifting mechanism is arranged at the top of the rack and comprises a lifting cylinder and a lifting rod, the bottom of the lifting cylinder is fixedly arranged on a portal frame beam, and the lifting end of the lifting cylinder is kept to lift axially along the axial loading mechanism; the top of the lifting rod is connected with the lifting end of the lifting cylinder, and the bottom of the lifting rod penetrates out of the through hole of the cross beam and is fixedly connected with the top of the pressure chamber to drive the pressure chamber to lift along the axial direction of the axial loading rod assembly;
the data acquisition mechanism comprises a top load sensor, an underwater load sensor, a data acquisition line and a controller, wherein the top load sensor is arranged between the top end of the axial loading rod assembly and a cross beam of the portal frame, and a data transmission port of the top load sensor is connected with a signal input end of the controller through the data acquisition line and is used for acquiring load of the top end of the axial loading rod assembly on the cross beam and transmitting the load to the controller; the underwater load sensor is arranged in the pressure chamber, the top of the underwater load sensor is connected with the lower end of an axial loading rod assembly extending into the inner cavity of the pressure chamber, the bottom of the underwater load sensor is connected with the top end of the sample clamping part, and the signal output end of the underwater load sensor is connected with the signal input end of the controller through a data acquisition line and used for transmitting acquired load data to the controller.
Preferably, the axial loading rod assembly comprises a connecting rod and a loading rod, and the top end of the connecting rod is connected with the bottom of the top load sensor; the loading rod is coaxial with the connecting rod, the top end of the loading rod is fixedly connected with the bottom end of the connecting rod, the lower end of the loading rod is inserted into the inner cavity of the pressure chamber from the top of the pressure chamber, and the tail end of the loading rod is fixedly provided with the underwater load sensor.
Preferably, the side surface of the connecting rod is provided with a pore canal along the radial direction and used as an external guide channel of the data acquisition line; the loading rod is provided with a channel for the data acquisition line to penetrate through along the length direction, so that the upper end of the data acquisition line penetrates out of the channel of the loading rod and then is led out of the pressure chamber from an external guide channel lifted by the connecting rod.
Preferably, the pressure chamber comprises a pressure chamber cover and a pressure chamber base, the pressure chamber cover is detachably mounted on the pressure chamber base in a sealing mode, a top cover of the pressure chamber cover is fixedly connected with the lower end of a lifting rod of the pressure chamber lifting mechanism, and an upper mounting hole for a loading rod to be inserted in a sealing mode is formed in the center of the top cover; the pressure chamber base is arranged at the bottom of the pressure chamber cover in a sealing way, and a test cavity is enclosed by the pressure chamber base and the pressure chamber cover in a sealing way; the side of the pressure chamber base is provided with a water through hole which can be communicated with the test cavity, and the center of the bottom is provided with a lower mounting through hole for inserting the bottom of the sample clamping part.
Preferably, the sample clamping part comprises an upper pressurizing cap and a lower pressurizing cap, the upper pressurizing cap is fixedly arranged at the bottom of the underwater load sensor, an upper drainage pipe is arranged on the side surface of the upper pressurizing cap, one end of the upper drainage pipe is communicated with a sealed inner cavity of the pressure chamber, and the other end of the upper drainage pipe extends to the lower end surface of the upper pressurizing cap and is used for consolidation drainage or backpressure on the upper part of the test piece; the lower end of the lower pressurizing cap penetrates out of a lower mounting hole of the pressure chamber base, the lower pressurizing cap and the pressure chamber base are in sealed sliding fit, and a clamping area for clamping a sample is reserved between the upper end of the lower pressurizing cap and the bottom end of the upper pressurizing cap; a lower drainage pipe is arranged on the side surface of the lower pressurizing cap, one end of the lower drainage pipe is communicated with the sealed inner cavity of the pressure chamber, and the other end of the lower drainage pipe extends to the upper end surface of the lower pressurizing cap and is used for draining water under the sample to measure the pore water pressure of the sample; the lower end face of the upper pressurizing cap and the upper end face of the lower pressurizing cap are respectively provided with a permeable stone for being placed on the upper end face and the lower end face of the sample.
Preferably, the upper pressurizing cap, the lower pressurizing cap, the connecting rod and the loading rod are coaxial.
Preferably, the connecting rod and the loading rod are hermetically screwed and fixedly connected together through a bolt.
Preferably, the lower end of the loading rod is in sealing threaded connection with the top end of the upper pressurizing cap.
Preferably, the underwater load sensor is a disc-shaped member, the upper top surface and the lower top surface of the disc-shaped member are planes, 8 circular holes with equal intervals are distributed on the upper top surface, and a section of equal-diameter cylindrical member with a pore passage left inside is extended below the sensor and is used as a pressurizing upper cap of the test piece.
Preferably, the upper top surface diameter > the lower top surface diameter > the extension cylindrical member diameter.
The invention has the beneficial effects that: the invention eliminates the influence of additional force of the functional membrane generated by the sealing requirement of the pressure chamber between the top cover of the pressure chamber and the loading piston rod when the axial load sensor is used for measuring; the underwater load sensor of the novel device can obtain the axial stress value of the sample, so that the measurement is more accurate, the true value of the axial stress in the test process is accurately obtained, and the quality of the similar scientific research experiment results is greatly improved.
Drawings
FIG. 1 is an elevational view of the apparatus of the present invention;
FIG. 2 is a cross-sectional view of the apparatus of the present invention;
FIG. 3 is a cross-sectional view of a connection configuration of the force measuring system of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
With reference to the accompanying drawings:
the gantry type lifting device comprises a frame 1 and a lifting mechanism, wherein the frame comprises a supporting seat 11 and a gantry 12, the bottom of the gantry is mounted on the supporting seat, and a through hole is formed in an upper cross beam of the gantry and used for mounting the lifting mechanism;
the axial loading mechanism 2 is arranged between a portal frame beam and a supporting seat and comprises an axial loading rod assembly 21, a pressure chamber 22 and a sample loading device 23, wherein the lower end part of the axial loading rod assembly 21 is inserted into a sealed inner cavity of the pressure chamber and then the sample loading device 23 is fixedly installed; the pressure chamber 22 is arranged on the rack below the axial loading rod component, the top of the pressure chamber 22 is connected with the lifting end of the pressure chamber lifting mechanism 3, and the bottom of the pressure chamber 22 is provided with a water through hole for injecting water into the pressure chamber; the sample loading device 23 comprises a sample clamping part and an axial actuator, the sample clamping part is arranged in the pressure chamber and is coaxial with the axial loading rod assembly, and the bottom of the sample clamping part penetrates out of the bottom of the pressure chamber and then is connected with the axial actuator;
the pressure chamber lifting mechanism 3 is arranged at the top of the rack and comprises a lifting cylinder 31 and a lifting rod 32, the bottom of the lifting cylinder 31 is fixedly arranged on a cross beam of the portal frame 12, and the lifting end of the lifting cylinder 31 is kept to lift axially along the axial loading mechanism; the top of the lifting rod 32 is connected with the lifting end of the lifting cylinder 31, and the bottom of the lifting rod penetrates out of the through hole of the cross beam and is fixedly connected with the top of the pressure chamber to drive the pressure chamber to lift along the axial direction of the axial loading rod assembly;
the data acquisition mechanism comprises a top load sensor 41, an underwater load sensor 42, a data acquisition line 43 and a controller, wherein the top load sensor 41 is fixed between the top end of the axial loading rod assembly and a cross beam of the portal frame through a bolt, and a data transmission port of the top load sensor 41 is connected with a signal input end of the controller through the data acquisition line and is used for acquiring load of the top end of the axial loading rod assembly 21 on the cross beam and transmitting the load to the controller; the underwater load sensor is arranged in the pressure chamber, the top of the underwater load sensor is connected with the lower end of an axial loading rod component extending into the inner cavity of the pressure chamber, the bottom of the underwater load sensor is connected with the top end of the sample clamping part, and the signal output end of the underwater load sensor is connected with the signal input end of the controller through a data acquisition line 43 and used for transmitting acquired load data to the controller; and the controller is provided with a display screen for displaying the acquired data and the processed data.
Preferably, the axial loading rod assembly 21 comprises a connecting rod 211 and a loading rod 212, wherein the top end of the connecting rod 211 is connected with the bottom of the top load sensor 41; the loading rod 212 is coaxial with the connecting rod, the top end of the loading rod is fixedly connected with the bottom end of the connecting rod 211, the lower end of the loading rod is inserted into the inner cavity of the pressure chamber 22 from the top, and the underwater load sensor is fixedly arranged at the tail end of the loading rod, wherein the loading rod is in sealing sliding fit with the pressure chamber.
Preferably, the side surface of the connecting rod 211 is provided with a pore channel along the radial direction, and the pore channel is used as an external guide channel of a data acquisition line; the loading rod 212 is provided with a channel for the data acquisition line to penetrate through along the length direction, so that the upper end of the data acquisition line is led out of the pressure chamber from an external guide channel lifted by the connecting rod after penetrating out of the channel of the loading rod.
Preferably, the pressure chamber 22 comprises a pressure chamber cover 221 and a pressure chamber base 222, the pressure chamber cover 221 is detachably mounted on the pressure chamber base 222 in a sealing manner, the pressure chamber base 222 and the pressure chamber cover 221 are fastened together through six bolts, an O-ring is arranged in the middle of the pressure chamber cover, and the pressure chamber cover 221 can slide along with the loading rod; the top cover of the pressure chamber cover 221 is fixedly connected with the lower end of the lifting rod 32 of the pressure chamber lifting mechanism 3, and the center of the top cover is provided with an upper mounting hole for the loading rod to be inserted in a sealing way; the pressure chamber base 222 is hermetically arranged at the bottom of the pressure chamber cover, and the pressure chamber base and the pressure chamber cover are hermetically enclosed to form a test cavity; the side of the pressure chamber base is provided with a water through hole 223 which can be communicated with the test cavity, and the center of the bottom is provided with a lower mounting through hole into which the bottom of the sample clamping part can be inserted.
Preferably, the sample clamping portion comprises an upper pressure cap 231 and a lower pressure cap 232, the upper pressure cap 231 is fixedly arranged at the bottom of the underwater load sensor 42, an upper drainage pipe 233 is arranged on the side surface of the upper pressure cap 231, one end of the upper drainage pipe is communicated with the sealed inner cavity of the pressure chamber, and the other end of the upper drainage pipe extends to the lower end surface of the upper pressure cap and is used for consolidation drainage or backpressure on the upper part of the test piece; the lower end of the lower pressurizing cap 232 penetrates out of the lower mounting hole of the pressure chamber base 222 and then is connected with an axial actuator below the pressure chamber, the lower end of the lower pressurizing cap and the axial actuator are in sealing sliding fit, and a clamping area for clamping a sample is reserved between the upper end of the lower pressurizing cap and the bottom end of the upper pressurizing cap; a lower drainage pipe 234 is arranged on the side surface of the lower pressurizing cap 232, one end of the lower drainage pipe is communicated with the sealed inner cavity of the pressure chamber, and the other end of the lower drainage pipe extends to the upper end surface of the lower pressurizing cap and is used for draining water under the sample to measure the pore water pressure of the sample; the lower end face of the upper pressurizing cap and the upper end face of the lower pressurizing cap are respectively provided with a permeable stone 235 for being placed on the upper end face and the lower end face of the sample 5.
Preferably, the axial actuator is an axial servo actuator arranged perpendicular to the axial direction of the axial loading rod assembly 21, and the lifting end of the axial servo actuator is connected with the bottom end of the lower pressure cap and used for adjusting the size of a clamping area between the upper pressure cap and the lower pressure cap so as to adapt to samples with different specifications.
Preferably, the upper pressurizing cap 231, the lower pressurizing cap 232, the connecting rod 211 and the loading rod 212 are coaxial.
Preferably, the connecting rod 211 and the loading rod 212 are hermetically screwed and fastened together by a bolt.
Preferably, the lower end of the loading rod 212 is hermetically screw-coupled to the top end of the upper pressurizing cap 231.
Preferably, the underwater load sensor 42 is a disc-shaped member, the upper top surface and the lower top surface of the disc-shaped member are planes, 8 circular holes with equal intervals are distributed on the upper top surface, and a section of equal-diameter cylindrical member with a pore passage left inside is extended below the sensor to be used as a pressurizing upper cap of the test piece.
Preferably, the upper top surface diameter > the lower top surface diameter > the extension cylindrical member diameter.
The loading rod and the pressure chamber are similar to a piston structure, the loading rod and the pressure chamber can slide in a sealing manner under the action of external force, the inner part of the loading rod is hollowed to serve as a leading-out channel of a data acquisition lead, the channel is arranged along the length direction (namely the axial direction) of the loading rod, and two end parts of the channel respectively extend to the upper end part and the lower end part of the loading rod and are used for data acquisition lines to pass through; the upper end of the underwater load sensor is screwed up and connected and fixed with the loading rod through threads, and the lower end of the underwater load sensor is in direct contact with a soil sample to be measured through the upper pressurizing cap.
The underwater load sensor is a disc-shaped member, the upper top surface and the lower top surface of the disc-shaped member are planes, 8 circular holes with equal intervals are distributed on the upper top surface, a section of equal-diameter cylindrical member with a pore passage reserved inside is extended below the sensor and used as a pressurizing upper cap of a soil sample, wherein the diameter of the upper top surface is larger than the diameter of the lower top surface of the sensor and is larger than the diameter of the extended cylindrical member.
The upper end of the loading rod is connected with the top load sensor through a connecting rod, and the connecting rod is provided with a pore channel with a certain height along the radial direction of the rod body and used as a leading-out channel for collecting data lines.
The underwater load sensor is positioned in the pressure chamber, and a signal of the underwater load sensor is led out of the pressure chamber from the upper part of the underwater load sensor through a data acquisition line and a channel arranged in the middle of the loading rod and is connected to the controller.
The pressure chamber cover is composed of a top cover and a side baffle, an upper mounting hole is formed in the center of the top cover, the upper edge of the side baffle is connected with the periphery of the top cover, the lower edge of the side baffle is connected with the surface of the pressure chamber base, and a sealed cavity is formed by the upper edge, the lower edge and the surface of the pressure chamber base in a surrounding mode.
Example 3 the installation method according to the invention is as follows:
1) dismantling an axial loading rod of the original multifunctional TYD-20 dynamic triaxial apparatus;
2) according to the size of loading pole is pulled down to original multi-functional TYD-20 movable triaxial apparatus, do connecting rod 211 and the loading pole 212 of the same size of cross section, the total length of connecting rod 211 and loading pole 212 is the same with the length of original movable triaxial apparatus loading pole. The top load sensor 41 is retained and is disposed on the top of the connecting rod 211. An underwater load sensor 42 having excellent accuracy, water tightness, reliability, and the like is provided at the bottom of the loading rod 212. And the loading rod 212 is hollowed out in the middle of the cross section in the axial direction, wherein the hollow part is used for placing the data acquisition line 43 of the sensor. The connecting rod 211 and the loading rod 212 are connected and fixed with each other through threads and studs. In order to connect the data collection line 43 to the controller, holes are formed at the bottom and the side of the connection rod 211, and the maximum lifting height of the top of the pressure chamber 22 is not higher than the height of the hole of the connection rod 211.
3) During loading, the underwater load sensor is immersed in water in the pressure chamber, the lower end of the underwater load sensor is contacted with the sample, the sample is connected with the sensor through effective binding of the rubber mold, and the underwater load sensor is not influenced by pressure change in the pressure chamber; the underwater sensor 42 of the system adopts an English AML STALC3 type underwater load sensor, the distance between the upper top surface and the lower top surface of the underwater load sensor is about 3.3cm, the diameter of a main body is 7.5cm, the diameter of the cross section of the extending part of the lower top surface is about 3.9cm, the height of the unchanged cross section of the eye on the upper top surface in the vertical direction is 2.75cm, and the weight of the sensor is 0.85 kg. The underwater load sensor is connected with the bottom end of the loading rod 212 by a threaded bolt. Its advantages are direct measurement of axial force, eliminating the influence of additional force of functional membrane between top cover and loading rod, and no need of compensating pressure and friction of pressure chamber.
The controller of the invention adopts an M6255 electro-hydraulic servo dynamic test control system. The system adopts a high-precision AD converter and electronic circuit control technology, an amplifying circuit and a trap circuit to remove 50HZ power frequency interference, simulate the dynamic test of seismic waves in various wave states, and a high-speed data acquisition device samples engineering quantities such as axial force, pore pressure, displacement and the like at regular time. The multiple single-chip microcomputers are used as a foreground computer for data acquisition, and the background computer is used for operation and output by a system computer. After the parameters of the underwater load sensor are calibrated, the underwater load sensor can be normally used.
After the underwater load sensor is installed, after the instrument is debugged normally, the underwater load sensor is preliminarily calibrated by adopting a standard force ring, and then the sensor is calibrated again by water pressure generated by water injection of a pressure chamber, so that the static characteristic indexes of the underwater load sensor, such as sensitivity, linearity, repeatability, hysteresis and the like, are determined.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (10)
1. An axial underwater force measuring system device of a dynamic triaxial apparatus is characterized by comprising:
the gantry comprises a support seat and a gantry frame, wherein the bottom of the gantry frame is arranged on the support seat, and a through hole is formed in an upper cross beam of the gantry frame and used for mounting a lifting mechanism;
the axial loading mechanism is arranged between the portal frame beam and the supporting seat and comprises an axial loading rod assembly, a pressure chamber and a sample loading device, wherein the lower end part of the axial loading rod assembly is inserted into a sealed inner cavity of the pressure chamber and then fixedly mounted with the sample loading device; the pressure chamber is arranged on the rack below the axial loading rod assembly, the top of the pressure chamber is connected with the lifting end of the lifting mechanism, and the bottom of the pressure chamber is provided with a water through hole for injecting water into the pressure chamber; the sample loading device comprises a sample clamping part and an axial actuator, the sample clamping part is arranged in the pressure chamber and is coaxial with the axial loading rod assembly, and the bottom of the sample clamping part penetrates out of the bottom of the pressure chamber and then is connected with the axial actuator for adjusting the clamping degree of the sample clamping part on the sample;
the pressure chamber lifting mechanism is arranged at the top of the rack and comprises a lifting cylinder and a lifting rod, the bottom of the lifting cylinder is fixedly arranged on a portal frame beam, and the lifting end of the lifting cylinder is kept to lift axially along the axial loading mechanism; the top of the lifting rod is connected with the lifting end of the lifting cylinder, and the bottom of the lifting rod penetrates out of the through hole of the cross beam and is fixedly connected with the top of the pressure chamber to drive the pressure chamber to lift along the axial direction of the axial loading rod assembly;
the data acquisition mechanism comprises a top load sensor, an underwater load sensor, a data acquisition line and a controller, wherein the top load sensor is arranged between the top end of the axial loading rod assembly and a cross beam of the portal frame, and a data transmission port of the top load sensor is connected with a signal input end of the controller through the data acquisition line and is used for acquiring load of the top end of the axial loading rod assembly on the cross beam and transmitting the load to the controller; the underwater load sensor is arranged in the pressure chamber, the top of the underwater load sensor is connected with the lower end of an axial loading rod assembly extending into the inner cavity of the pressure chamber, the bottom of the underwater load sensor is connected with the top end of the sample clamping part, and the signal output end of the underwater load sensor is connected with the signal input end of the controller through a data acquisition line and used for transmitting acquired load data to the controller.
2. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 1, wherein: the axial loading rod assembly comprises a connecting rod and a loading rod, and the top end of the connecting rod is connected with the bottom of the top load sensor; the loading rod is coaxial with the connecting rod, the top end of the loading rod is fixedly connected with the bottom end of the connecting rod, the lower end of the loading rod is inserted into the inner cavity of the pressure chamber from the top of the pressure chamber, and the tail end of the loading rod is fixedly provided with the underwater load sensor.
3. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 2, wherein: the side surface of the connecting rod is provided with a pore canal along the radial direction and is used as an external guide channel of a data acquisition line; the loading rod is provided with a channel for the data acquisition line to penetrate through along the length direction, so that the upper end of the data acquisition line penetrates out of the channel of the loading rod and then is led out of the pressure chamber from an external guide channel lifted by the connecting rod.
4. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 3, wherein: the pressure chamber comprises a pressure chamber cover and a pressure chamber base, the pressure chamber cover is detachably mounted on the pressure chamber base in a sealing mode, a top cover of the pressure chamber cover is fixedly connected with the lower end of a lifting rod of the pressure chamber lifting mechanism, and an upper mounting hole for a loading rod to be inserted in a sealing mode is formed in the center of the top cover; the pressure chamber base is arranged at the bottom of the pressure chamber cover in a sealing way, and a test cavity is enclosed by the pressure chamber base and the pressure chamber cover in a sealing way; the side of the pressure chamber base is provided with a water through hole which can be communicated with the test cavity, and the center of the bottom is provided with a lower mounting through hole for inserting the bottom of the sample clamping part.
5. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 4, wherein: the sample clamping part comprises an upper pressurizing cap and a lower pressurizing cap, the upper pressurizing cap is fixedly arranged at the bottom of the underwater load sensor, and an upper drainage pipe is arranged on the side surface of the upper pressurizing cap, wherein one end of the upper drainage pipe is communicated with a sealed inner cavity of the pressure chamber, and the other end of the upper drainage pipe extends to the lower end surface of the upper pressurizing cap and is used for consolidation drainage or counter pressure on the upper part of the test piece; the lower end of the lower pressurizing cap penetrates out of a lower mounting hole of the pressure chamber base, the lower pressurizing cap and the pressure chamber base are in sealed sliding fit, and a clamping area for clamping a sample is reserved between the upper end of the lower pressurizing cap and the bottom end of the upper pressurizing cap; a lower drainage pipe is arranged on the side surface of the lower pressurizing cap, one end of the lower drainage pipe is communicated with the sealed inner cavity of the pressure chamber, and the other end of the lower drainage pipe extends to the upper end surface of the lower pressurizing cap and is used for draining water under the sample to measure the pore water pressure of the sample; the lower end face of the upper pressurizing cap and the upper end face of the lower pressurizing cap are respectively provided with a permeable stone for being placed on the upper end face and the lower end face of the sample.
6. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 5, wherein: the upper pressurizing cap, the lower pressurizing cap, the connecting rod and the loading rod are all coaxial.
7. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 3, wherein: the connecting rod and the loading rod are in sealing threaded connection and are fixedly connected together through a bolt.
8. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 7, wherein: the lower end of the loading rod is in sealing threaded connection with the top end of the upper pressurizing cap.
9. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 1, 5 or 6, wherein: the underwater load sensor is a disc-shaped member, the upper top surface and the lower top surface of the underwater load sensor are planes, 8 circular holes with equal intervals are distributed on the upper top surface, and a section of equal-diameter cylindrical member with a pore passage left inside is extended below the sensor and is used as a pressurizing upper cap of a test piece.
10. An axial underwater force measuring system device of a dynamic triaxial apparatus as claimed in claim 9, wherein: upper top surface diameter > lower top surface diameter > extension cylinder member diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010892224.3A CN112213186B (en) | 2020-08-31 | 2020-08-31 | Axial underwater force measuring system device of dynamic triaxial apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010892224.3A CN112213186B (en) | 2020-08-31 | 2020-08-31 | Axial underwater force measuring system device of dynamic triaxial apparatus |
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| CN114112207A (en) * | 2021-12-06 | 2022-03-01 | 中国船舶科学研究中心 | Load applying device for sealing test of underwater connection sealing structure |
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