CN105158078A - Triaxial core loading testing device - Google Patents
Triaxial core loading testing device Download PDFInfo
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- CN105158078A CN105158078A CN201510622030.0A CN201510622030A CN105158078A CN 105158078 A CN105158078 A CN 105158078A CN 201510622030 A CN201510622030 A CN 201510622030A CN 105158078 A CN105158078 A CN 105158078A
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Abstract
The embodiment of the invention provides a triaxial core loading testing device. The triaxial core loading testing device comprises a Z-axis loading portion and an X-Y-axis loading portion. The X-Y-axis loading portion comprises a pressure bearing shell and a flexible bag which is arranged in the pressure bearing shell, and expansion and contraction of the flexible bag can be controlled. In an expansion state, the flexible bag can be used for carrying out X-Y-axis pressure loading on a core sample, and is in cooperation with the Z-axis loading portion to seal the core sample. The triaxial core loading testing device is suitable for triaxial core loading tests of regular quadrangular cores in the shape of a cube and the like, pressure can be applied to the regular quadrangular cores in the three-dimensional direction, and meanwhile fluid in the cores can be prevented from flowing out.
Description
Technical field
The application relates to rock core mechanical test technical field, especially relates to a kind of triaxial core loading test device.
Background technology
In conventional one-axis mechanical test and false three-axis force testing experiment, generally adopt heat-shrink tube jacket to carry out parcel to cylindrical rock core to accommodate, and utilize supporting base to be arranged on by cylindrical rock core to test in cavity.Utilize heat-shrink tube by rock core and isolate from outer air simultaneously, or completely cut off with the hydraulic oil applying confined pressure, and then play the effect of sealing rock core.Because the four-prism shape rock cores such as cube will be subject to the effect of three direction stress simultaneously, only can not realize by thermal shrinkable sleeve clamping the applying aligning four prism type rock core horizontal two-dimension both direction stress, therefore said method is not suitable for the four-prism shape rock cores such as cube.
And in the test of current true triaxial mechanical test, often rock core is arranged between 6 rigid plate, when carrying out rigidity and loading, these 6 rigid plate can carry out pressure applying to three directions, thus realize the clamping to four-prism shape rock cores such as cubes.But this rigid plate loads and brings new problem simultaneously: namely when there being fluid in the rock core that clamps, easily cause fluid outwards to be scurried out between these rigid plate.
Summary of the invention
The object of the embodiment of the present application is to provide a kind of triaxial core loading test device being applicable to the four-prism shape rock cores such as cube, to realize the applying that can align four prism type rock three-dimensional pressure, and can prevent from altering outside rock core inner fluid simultaneously.
For achieving the above object, the embodiment of the present application provides a kind of triaxial core loading test device, comprises Z axis loading unit and XY axle loading unit, and described XY axle loading unit comprises:
Pressure-bearing shell;
Be arranged at and collapse controlled flexible utricule in described pressure-bearing shell; At swelling state, described flexible utricule in order to carry out the loading of XY axial pressure to core sample, and coordinates to seal described core sample with described Z axis loading unit.
The triaxial core loading test device of the embodiment of the present application, described flexible utricule comprises four flexible bags monomers, and described four flexible bags monomers are laid on the positive and negative direction of X-axis in described pressure-bearing shell and the positive and negative direction of Y-axis respectively.
The triaxial core loading test device of the embodiment of the present application, the inner side of described flexible utricule is provided with flexible seepage flow cylindrical shell.
The triaxial core loading test device of the embodiment of the present application, described XY axle loading unit also comprises seepage flow plug and lower seepage flow plug, all offer seepage channel in described upper seepage flow plug and described lower seepage flow plug, described upper seepage flow plug and described lower seepage flow plug distinguish the two ends up and down of flexible seepage flow cylindrical shell described in corresponding shutoff.
The triaxial core loading test device of the embodiment of the present application, the lower surface of described upper seepage flow plug offers several equally distributed diversion trenchs, and described diversion trench is connected with the seepage channel of seepage flow plug on this.
The triaxial core loading test device of the embodiment of the present application, described flexible utricule has upper shed, is provided with the drain plug sealing this upper shed in described upper shed, is provided with flow-guiding channel in described drain plug.
The triaxial core loading test device of the embodiment of the present application, described flexible utricule is the flexible utricule of fluid pressure type.
The triaxial core loading test device of the embodiment of the present application, described XY axle loading unit also comprises upper end cover and bottom end cover, described upper end cover engagement sleeves seepage flow plug is fixedly connected with the upper end of described pressure-bearing shell on described, and described bottom end cover engagement sleeves is on described lower seepage flow plug and be fixedly connected with the lower end of described pressure-bearing shell.
The triaxial core loading test device of the embodiment of the present application, described Z axis loading unit comprises the first hydraulic cylinder, and the end face ejecting end of the piston rod of described first hydraulic cylinder is concave surface; The upper end of described upper seepage flow plug is provided with end face deflection seat, and the upper surface of described end face deflection seat is the convex surface matched with described concave surface.
The triaxial core loading test device of the embodiment of the present application, described concave surface is concave spherical surface, corresponding, described convex surface is convex spherical.
The triaxial core loading test device of the embodiment of the present application, this device also comprises bearing plate and lower bearing plate, be fixedly connected with by stressed pull bar between described upper bearing plate and described lower bearing plate, described Z axis loading unit and described XY axle loading unit respectively correspondence to be fixed on described upper bearing plate and described lower bearing plate and position is corresponding.
The triaxial core loading test device of the embodiment of the present application, this device also comprises the sample ejecting mechanism in order to be ejected in described XY axle loading unit by described core sample.
The triaxial core loading test device of the embodiment of the present application, described sample ejecting mechanism comprises the second hydraulic cylinder, described second hydraulic cylinder is positioned at below described XY axle loading unit, and the end that ejects of the piston rod of described second hydraulic cylinder is connected through described lower bearing plate and described lower seepage flow are stifled.
The triaxial core loading test device of the embodiment of the present application, has axial seepage channel in the piston rod of described second hydraulic cylinder, and the seepage channel that described axial seepage channel blocks up with described lower seepage flow is connected.
The triaxial core loading test device of the embodiment of the present application, this device also comprises displacement detecting portion, and it comprises:
Displacement transducer, it is installed in described pressure-bearing shell, for detecting described core sample grade in the displacement of XY direction of principal axis;
Displacement drive link, its ecto-entad is connected with institute displacement sensors with after described flexible seepage flow cylindrical shell through described pressure-bearing shell, described flexible utricule successively.
The triaxial core loading test device of the embodiment of the present application, the bore seal of described displacement drive link and described flexible utricule is isolated.
The triaxial core loading test device of the embodiment of the present application, this device also comprises support, and described lower bearing plate is fixedly installed on described support.
In the triaxial core loading test device of the embodiment of the present application, its XY axle loading unit has pressure-bearing shell, be provided with in this pressure-bearing shell and collapse controlled flexible utricule, this flexible bags body can carry out the loading of XY axial pressure to core sample, and coordinate to seal core sample with Z axis loading unit, from achieving the applying that can align four prism type rock three-dimensional pressure, and can prevent from altering outside rock core inner fluid simultaneously.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the embodiment of the present application, forms the part of the embodiment of the present application, does not form the restriction to the embodiment of the present application.In the accompanying drawings:
Fig. 1 is the front sectional view of the triaxial core loading test device of the embodiment of the present application.
Fig. 2 is a place enlarged drawing of Fig. 1.
Embodiment
For making the object of the embodiment of the present application, technical scheme and advantage clearly understand, below in conjunction with embodiment and accompanying drawing, the embodiment of the present application is described in further details.At this, the schematic description and description of the embodiment of the present application for explaining the embodiment of the present application, but not as the restriction to the embodiment of the present application.
Below in conjunction with accompanying drawing, the embodiment of the embodiment of the present application is described in further detail.
Shown in figure 1, the triaxial core loading test device of the embodiment of the present application comprises Z axis loading unit 1 and XY axle loading unit 2.Z axis loading unit 1 is for applying axial stress to core sample, and XY axle loading unit 2 is for applying horizontal direction stress to core sample.
In the embodiment of the present application, described XY axle loading unit 2 comprises pressure-bearing shell 3 and is arranged at and collapses controlled flexible utricule 4 in described pressure-bearing shell 3.At swelling state, described flexible utricule 4 loads in order to carry out XY axial pressure (i.e. horizontal stress) to core sample, and coordinates to seal described core sample with described Z axis loading unit 1.
In some embodiments of the application, described flexible utricule 4 can be four flexible bags monomers, and described four flexible bags monomers are laid on the positive and negative direction of X-axis in described pressure-bearing shell and the positive and negative direction of Y-axis respectively.Each like this flexible bags monomer independently can realize the stress loading on a direction, and four flexible bags monomers independently carry out stress loading thus can realize horizontal direction loading the asymmetric stresses of core sample separately.In other embodiments of the application, if do not require that asymmetric stresses loads.Above-mentioned flexible utricule 4 also can be integrative-structure, such as with the cavity tube structure of core sample form fit.In addition, in some embodiments of the application, described flexible utricule 4 can be fluid pressure type flexible rubber capsule.When flexible utricule 4 is by hydraulic coupling dilatational strain, outside it, deformation force is offset by the pressure-bearing shell 3 of metal material, inside it, deformation force extruding core sample realizes flexibility stress loading, simultaneously, due under the effect of hydraulic coupling, the flexible utricule 4 of fully distortion can be filled with the inner chamber of XY axle loading unit 2, thus achieves the sealing to core sample, ensure that when carrying out Seepage Experiment to core sample, percolating medium does not leak spilling.
In some embodiments of the application, the inner side of described flexible utricule 4 is provided with flexible seepage flow cylindrical shell 5; This flexible seepage flow cylindrical shell 5 is square cylinder, is suitable for placing four-prism shape core sample in it; This flexible seepage flow cylindrical shell 5 is for coordinating with miscellaneous part (refer to and hereafter introduce) with the Seepage Experiment realized core sample.
In some embodiments of the application, XY axle loading unit 2 can also comprise seepage flow plug 6 and lower seepage flow plug 7, described upper seepage flow plug 6 and described lower seepage flow plug 7 are square cylinder, all seepage channel is offered in it, described upper seepage flow plug 6 and described lower seepage flow plug 7 distinguish the two ends up and down of flexible seepage flow cylindrical shell 4 described in corresponding shutoff, thus described upper seepage flow plug 6, described lower seepage flow plug 7 and described flexible seepage flow cylindrical shell 4 coordinate formation core sample container cavity.
In some embodiments of the application, the lower surface of described upper seepage flow plug 6 offers several equally distributed diversion trenchs, described diversion trench is connected with the seepage channel of seepage flow plug 6 on this, is conducive to like this ensureing that percolating medium can be distributed in the upper surface of core sample uniformly.
Shown in composition graphs 2, in some embodiments of the application, described flexible utricule 4 has upper shed, is provided with the drain plug 8 sealing this upper shed in described upper shed, is provided with flow-guiding channel in described drain plug 8.
Continue with reference to shown in figure 1, in some embodiments of the application, described XY axle loading unit 2 also comprises upper end cover 9 and bottom end cover 10, described upper end cover 9 engagement sleeves seepage flow plug 6 is fixedly connected with the upper end of described pressure-bearing shell 3 on described, and described bottom end cover 10 engagement sleeves is on described lower seepage flow plug 7 and be fixedly connected with the lower end of described pressure-bearing shell 3.Wherein, being provided with drain interface 11 with described drain plug 8 corresponding position on described upper end cover 9, for realizing loading and the off-load of hydraulic pressure.
In some embodiments of the application, described Z axis loading unit 1 comprises the first hydraulic cylinder 12, and the end face ejecting end 13 of the piston rod of described first hydraulic cylinder 12 is concave surface; The upper end of described upper seepage flow plug 6 is provided with end face deflection seat 14, and the upper surface of described end face deflection seat 14 is the convex surface matched with described concave surface.Like this, when the end face of the Z-direction of core sample is not parallel, described concave surface coordinates with convex surface and can automatically deflect suitable angle, thus ensures that Z axis stress can load on core sample more uniformly.In one preferably embodiment, described concave surface is concave spherical surface, corresponding, described convex surface is convex spherical.
In some embodiments of the application, triaxial core loading test device can also comprise bearing plate 15 and lower bearing plate 16, be fixedly connected with by stressed pull bar 17 between described upper bearing plate 15 and described lower bearing plate 16, described Z axis loading unit 1 and described XY axle loading unit 2 respectively correspondence to be fixed on described upper bearing plate 15 and described lower bearing plate 16 and position is corresponding.Described stressed pull bar 17 is for limiting described upper bearing plate 15 and described lower bearing plate 16 moves, the stress that indirect carrying applies core sample Z axis, wherein, because described upper bearing plate 15 is connected with described Z axis loading unit 1, its opposing Z axis acting force, relies on self-strength to avoid moderate finite deformation to load in order to complete Z axis.
In some embodiments of the application, described triaxial core loading test device can also comprise the sample ejecting mechanism 18 in order to be ejected in described XY axle loading unit 2 by described core sample.Described sample ejecting mechanism comprises the second hydraulic cylinder 19, and described second hydraulic cylinder 19 is positioned at below described XY axle loading unit 2, and the end that ejects of the piston rod of described second hydraulic cylinder 19 is connected with described lower seepage flow stifled 7 through described lower bearing plate 16.Have axial seepage channel in the piston rod of described second hydraulic cylinder 19, the seepage channel that described axial seepage channel blocks up 7 with described lower seepage flow is connected.General, after experiment completes,
Sample ejecting mechanism 18 is by the hydraulic unloading interface injection liquid pressure to described Z axis loading unit 1, the piston rod of described Z axis loading unit 1 is made to withdraw and vacate operating space, again by hydraulic pressure for the piston rod of sample ejecting mechanism 18 self provides upper expulsive force, thus core sample is upwards ejected in XY axle loading unit 2, during this, lower seepage flow plug 7 also plays the effect that thrust is transmitted.
Shown in composition graphs 2, in some embodiments of the application, described triaxial core loading test device can also comprise displacement detecting portion 20, and it comprises:
Displacement transducer 21, it is installed in described pressure-bearing shell 3, for detecting described core sample grade in the displacement of XY direction of principal axis;
Displacement drive link 22, its ecto-entad is connected with institute displacement sensors 21 with after described flexible seepage flow cylindrical shell 5 through described pressure-bearing shell 3, described flexible utricule 4 successively.In addition, described displacement drive link 22 is isolated with the bore seal of described flexible utricule 4.
In some embodiments of the application, described triaxial core loading test device can also comprise support 23, and described lower bearing plate 16 is fixedly installed on described support 23.The weight assurance device that described support 23 is used for carrying package unit stable.
In the triaxial core loading test device of the embodiment of the present application, its XY axle loading unit has pressure-bearing shell, be provided with in this pressure-bearing shell and collapse controlled flexible utricule, this flexible bags body can carry out the loading of XY axial pressure to core sample, and coordinate to seal core sample with Z axis loading unit, from achieving the applying that can align four prism type rock three-dimensional pressure, and can prevent from altering outside rock core inner fluid simultaneously.As can be seen here, the triaxial core loading test device of the embodiment of the present application can simulation core sample true force-bearing situation in the earth formation, realizes loading the flexibility stress of the controlled difference of core sample outside surface, can be used for carrying out rock mechanics and seepage simulation test.
Above-described specific embodiment; the object of the application, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the embodiment of the present application; and be not used in the protection domain limiting the application; within all spirit in the application and principle, any amendment made, equivalent replacement, improvement etc., within the protection domain that all should be included in the application.
Claims (17)
1. a triaxial core loading test device, comprises Z axis loading unit and XY axle loading unit, it is characterized in that, described XY axle loading unit comprises:
Pressure-bearing shell;
Be arranged at and collapse controlled flexible utricule in described pressure-bearing shell; At swelling state, described flexible utricule in order to carry out the loading of XY axial pressure to core sample, and coordinates to seal described core sample with described Z axis loading unit.
2. triaxial core loading test device according to claim 1, it is characterized in that, described flexible utricule comprises four flexible bags monomers, and described four flexible bags monomers are laid on the positive and negative direction of X-axis in described pressure-bearing shell and the positive and negative direction of Y-axis respectively.
3. triaxial core loading test device according to claim 1 and 2, is characterized in that, the inner side of described flexible utricule is provided with flexible seepage flow cylindrical shell.
4. triaxial core loading test device according to claim 3, it is characterized in that, described XY axle loading unit also comprises seepage flow plug and lower seepage flow plug, all offer seepage channel in described upper seepage flow plug and described lower seepage flow plug, described upper seepage flow plug and described lower seepage flow plug distinguish the two ends up and down of flexible seepage flow cylindrical shell described in corresponding shutoff.
5. triaxial core loading test device according to claim 4, is characterized in that, the lower surface of described upper seepage flow plug offers several equally distributed diversion trenchs, and described diversion trench is connected with the seepage channel of seepage flow plug on this.
6. triaxial core loading test device according to claim 1 and 2, is characterized in that, described flexible utricule has upper shed, is provided with the drain plug sealing this upper shed in described upper shed, is provided with flow-guiding channel in described drain plug.
7. triaxial core loading test device according to claim 1 and 2, is characterized in that, described flexible utricule is the flexible utricule of fluid pressure type.
8. triaxial core loading test device according to claim 4, it is characterized in that, described XY axle loading unit also comprises upper end cover and bottom end cover, described upper end cover engagement sleeves seepage flow plug is fixedly connected with the upper end of described pressure-bearing shell on described, and described bottom end cover engagement sleeves is on described lower seepage flow plug and be fixedly connected with the lower end of described pressure-bearing shell.
9. triaxial core loading test device according to claim 8, is characterized in that, described Z axis loading unit comprises the first hydraulic cylinder, and the end face ejecting end of the piston rod of described first hydraulic cylinder is concave surface; The upper end of described upper seepage flow plug is provided with end face deflection seat, and the upper surface of described end face deflection seat is the convex surface matched with described concave surface.
10. triaxial core loading test device according to claim 9, is characterized in that, described concave surface is concave spherical surface, corresponding, described convex surface is convex spherical.
11. triaxial core loading test devices according to claim 4, it is characterized in that, this device also comprises bearing plate and lower bearing plate, be fixedly connected with by stressed pull bar between described upper bearing plate and described lower bearing plate, described Z axis loading unit and described XY axle loading unit respectively correspondence to be fixed on described upper bearing plate and described lower bearing plate and position is corresponding.
12. triaxial core loading test devices according to claim 11, is characterized in that, this device also comprises the sample ejecting mechanism in order to be ejected in described XY axle loading unit by described core sample.
13. triaxial core loading test devices according to claim 12, it is characterized in that, described sample ejecting mechanism comprises the second hydraulic cylinder, described second hydraulic cylinder is positioned at below described XY axle loading unit, and the end that ejects of the piston rod of described second hydraulic cylinder is connected through described lower bearing plate and described lower seepage flow are stifled.
14. triaxial core loading test devices according to claim 13, is characterized in that, have axial seepage channel in the piston rod of described second hydraulic cylinder, and the seepage channel that described axial seepage channel blocks up with described lower seepage flow is connected.
15. triaxial core loading test devices according to claim 3, it is characterized in that, this device also comprises displacement detecting portion, and it comprises:
Displacement transducer, it is installed in described pressure-bearing shell, for detecting described core sample grade in the displacement of XY direction of principal axis;
Displacement drive link, its ecto-entad is connected with institute displacement sensors with after described flexible seepage flow cylindrical shell through described pressure-bearing shell, described flexible utricule successively.
16. triaxial core loading test devices according to claim 15, is characterized in that, the bore seal of described displacement drive link and described flexible utricule is isolated.
17. triaxial core loading test devices according to claim 11, it is characterized in that, this device also comprises support, and described lower bearing plate is fixedly installed on described support.
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| CN105806762A (en) * | 2016-03-09 | 2016-07-27 | 中国矿业大学(北京) | True triaxial coal rock three-dimensional deformation and permeability holder |
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| CN105806762A (en) * | 2016-03-09 | 2016-07-27 | 中国矿业大学(北京) | True triaxial coal rock three-dimensional deformation and permeability holder |
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| CN106442264B (en) * | 2016-10-14 | 2023-09-29 | 吉林大学 | High-temperature high-pressure permeability testing device |
| CN108344624B (en) * | 2017-01-22 | 2021-11-23 | 北京交通大学 | Pressure head for axially loading non-circular section cylinder test block in hydraulic triaxial chamber |
| CN108344624A (en) * | 2017-01-22 | 2018-07-31 | 北京交通大学 | Axially loaded pressure head is carried out to the test block of noncircular cross section cylinder in hydraulic pressure triaxial chamber |
| CN107941621A (en) * | 2017-11-16 | 2018-04-20 | 中国石油集团川庆钻探工程有限公司 | A kind of rock true triaxial hydraulic fracturing emergent property test device |
| CN108469381A (en) * | 2018-03-26 | 2018-08-31 | 中南大学 | Brittleness soft rock is circumferential to press loading device, soft rock sampler and sampling method |
| CN108982225B (en) * | 2018-08-29 | 2023-09-29 | 常州大学 | Perforation sleeve-cement sheath strain simulation test device under action of lateral non-uniform load |
| CN108982225A (en) * | 2018-08-29 | 2018-12-11 | 常州大学 | Perforated casing-cement sheath strains simulation test device under a kind of lateral non-Uniform Loads |
| CN112378790A (en) * | 2020-11-24 | 2021-02-19 | 中国科学院地质与地球物理研究所 | High strain rate cyclic dynamic loading triaxial rock mechanical test system |
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