CN210071525U - Pressure chamber for large-diameter sandy gravel stratum triaxial experiment - Google Patents

Pressure chamber for large-diameter sandy gravel stratum triaxial experiment Download PDF

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Publication number
CN210071525U
CN210071525U CN201920451852.0U CN201920451852U CN210071525U CN 210071525 U CN210071525 U CN 210071525U CN 201920451852 U CN201920451852 U CN 201920451852U CN 210071525 U CN210071525 U CN 210071525U
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test chamber
test
chamber
pressure
sandy gravel
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CN201920451852.0U
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苏科宇
路家兴
孔令镕
乔世杰
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China University of Geosciences Beijing
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China University of Geosciences Beijing
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Abstract

The utility model discloses a pressure chamber for large-diameter sandy gravel stratum triaxial experiment, which comprises a test chamber, a sample table and a pressurizing piston; the top of the test chamber is provided with an opening, and an annular sealing ring is arranged at the opening end; a piston of the pressurizing piston is inserted into an opening at the top of the test chamber and is in friction fit with an inner ring of an annular sealing ring at the top of the test chamber; the test room is provided with double walls, an annulus is arranged between the two walls, the annulus is communicated with a hydraulic tank through a pipeline, and a pressure gauge is arranged on the hydraulic tank; a weight tray is arranged on the top of the hydraulic tank and is connected with a floater in the hydraulic tank through a connecting rod. The utility model adopts the weight hydraulic tank, and simulates the confining pressure of the sample in the real environment by increasing the weight of the weight; the top of the test room is sealed by ring rubber, and the deadweight of the piston is balanced by the friction between the rubber and the piston, so that the pressure on the piston is the external force borne by the sample; the test chamber and the test sample table are combined through annular rubber sealing, so that the test sample can be conveniently placed and replaced.

Description

Pressure chamber for large-diameter sandy gravel stratum triaxial experiment
Technical Field
The utility model relates to an equipment for the experiment especially relates to a major diameter sandy cobble stratum pressure chamber for triaxial experiment.
Background
With the advance of the construction process of underground rail transit systems of large cities such as Beijing, Chengdu and the like, the engineering geological conditions of the tunnel penetrating through the stratum are gradually harsh. The stratum in which shield interval construction in Beijing city is located is mostly water-rich sandy gravel stratum, the stratum damage mechanism of a tunneling surface is difficult to determine due to the large pebble particle size and the doping of boulders with super large particle size, and the work of shield machine model selection, cutter head structure design, shield machine parameter setting and the like is difficult to perform. In addition, the sandy gravel stratum has the characteristics of high dispersion, easy disturbance, point-to-point force transfer between particles, strong permeability and the like, so that the control of the stability of an excavation surface is extremely difficult, and the construction problems of influence on the excavation efficiency and increase of the engineering cost, such as serious abrasion of a cutter head cutter, local uneven abrasion, large rotation torque of the cutter head, easy blocking and the like caused by the existence of boulders and pebbles with large particle size, are solved. Therefore, the physical and mechanical characteristics of the sandy gravel stratum are analyzed, and the obtained related mechanical parameters can provide an important theoretical basis for research methods such as related model tests, numerical simulation analysis and the like aiming at the stratum, so that the stratum failure mechanism is researched, and great help is provided for determining a solution of a field problem encountered in the shield tunneling process of the stratum. In addition, in other civil engineering construction, such as the construction of super high earth-rock dams, the construction of foundation pits in water-rich sandy gravel stratum, and the like, mechanical analysis needs to be carried out on sandy gravel samples to optimize the construction scheme.
At present, no relatively perfect experimental mechanism exists in the domestic large-scale standard static triaxial test, the requirement of large confining pressure required in the rock stratum research process is mainly met, and the diameter of a test piece is small. Different from the rock stratum, the sandy gravel stratum has obvious discreteness and nonuniformity, the sizes of cobbles and stones are distributed differently, if a test piece is small, the representativeness of the test result is influenced, and in addition, the actual ground stress (required confining pressure) in the sandy gravel stratum is smaller than that of the rock stratum, so that the requirement of a large-diameter three-axis experiment of a typical sandy gravel stratum is not met. In addition, the large-diameter soil triaxial pressure chamber in the market has the advantages of complex hydraulic loading confining pressure form and structure and high cost, and the confining pressure fluctuation influence caused by axial compression deformation of the soil sample cannot be eliminated, so that the test precision is greatly reduced.
SUMMERY OF THE UTILITY MODEL
To the shortcoming and not enough among the above-mentioned prior art, the utility model aims at providing a major diameter sandy cobble stratum pressure chamber for triaxial experiment that experimental accuracy is high.
The utility model aims at realizing through the following technical scheme:
a pressure chamber for a large-diameter sandy gravel stratum triaxial experiment comprises a test chamber, a sample table at the bottom of the test chamber and a pressurizing piston arranged above the test chamber; the top opening of the test chamber is provided with an annular sealing ring, and the inner ring of the annular sealing ring is positioned in the outline of the top opening of the test chamber; the cylinder body of the pressurizing piston is arranged above the test room in a hanging manner, and the piston of the pressurizing cylinder body is inserted into an opening at the top of the test room and is in friction fit with an inner ring of an annular sealing ring arranged at the opening end at the top of the test room; the test chamber is provided with double walls, an annulus is arranged between the double walls, the annulus is communicated with a hydraulic tank through an opening on the outer side wall of the test chamber and a pipeline, and a pressure gauge is arranged on the hydraulic tank; a weight tray is arranged at the top of the hydraulic tank and is connected with a floater in the hydraulic tank through a connecting rod, weights are placed on the weight tray, and the weight tray applies pressure to hydraulic oil in the hydraulic tank and the annulus to simulate confining pressure.
Preferably, the connecting gap between the test bed and the bottom of the test chamber is sealed by an annular sealing ring.
Preferably, an oil outlet switch valve is arranged at the upper part of the test chamber.
Preferably, the device further comprises a plurality of fixing columns, a plurality of layers of horizontally arranged wing plates are distributed on the outer side wall of the test chamber from top to bottom, the fixing columns are vertically arranged and penetrate through the plurality of layers of horizontally arranged wing plates, and the bottom ends of the fixing columns are parallel to the sample table.
Preferably, the wing plate is provided with an opening for the pipeline to pass through, and the vertical pipeline for communicating the annular space with the hydraulic tank is righted through the opening on the wing plate.
Preferably, the test room is a cylindrical test room, three layers of wing plates are distributed above and below the wing plates on the outer side wall of the test room, and the distances between the adjacent wing plates are the same.
Preferably, each layer comprises at least two wing plates which are uniformly distributed along the ring shape, each wing plate correspondingly penetrates through at least one fixing column, and the relative positions of each wing plate and the fixing column penetrating through the wing plates are the same.
Preferably, the inner edge of the wing plate corresponds to the outline of the outer side wall of the cylindrical test chamber, and the outer edge is arc-shaped.
Preferably, the annular sealing ring is a circular rubber ring.
Compared with the prior art, the embodiment of the utility model provides a have following advantage at least:
the utility model adopts the weight hydraulic box, and maintains the inner wall confining pressure of 1MPa by increasing the weight, so as to simulate the confining pressure of a real simulation sample in the environment; the top of the test room is sealed by ring rubber, and the deadweight of the piston is balanced by the friction between the rubber and the piston, so that the pressure on the piston is the external force borne by the sample; the mode that adopts laboratory and base separation to through the sealed combination of annular rubber, be convenient for place the sample and change the sample.
Drawings
FIG. 1 is a schematic structural view of a pressure chamber for a large-diameter sandy gravel stratum triaxial experiment of the present invention;
FIG. 2 is a schematic cross-sectional structure view of the pressure chamber for a large-diameter sandy gravel stratum triaxial experiment of the present invention;
fig. 3 is a partially enlarged view of a portion a in fig. 2.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, wherein the following embodiments are illustrative, not restrictive, and should not be construed as limiting the scope of the present invention.
A pressure chamber for a large-diameter sandy gravel stratum triaxial experiment comprises a test chamber 8, a sample table 10 at the bottom of the test chamber 8 and a pressurizing piston 1 arranged above the test chamber 8; the top of the laboratory 8 is opened, an annular sealing ring 2 is arranged at the opening end, and the inner ring of the annular sealing ring 2 is positioned in the opening outline at the top of the laboratory 8; the cylinder body of the pressurizing piston 1 is arranged above the test chamber 8 in a hanging way, and the piston of the pressurizing cylinder body is inserted into an opening at the top of the test chamber 8 and is in friction fit with an inner ring of an annular sealing ring 2 arranged at the opening end at the top of the test chamber 8; the test chamber 8 is provided with double walls, an annular space 9 is arranged between the double walls, the annular space 9 is communicated with a hydraulic tank 6 through an opening and a pipeline on the outer side wall of the test chamber 8, and a pressure gauge 5 is arranged on the hydraulic tank 6; a weight plate 3 is arranged at the top of the hydraulic tank 6, the weight plate 3 is connected with a floater in the hydraulic tank 6 through a connecting rod, weights are placed on the weight plate 3, and the weight plate exerts pressure on hydraulic oil in the hydraulic tank 6 and the annular space 9 to simulate confining pressure.
The connecting gap between the test bed and the bottom of the test room 8 is sealed by the annular sealing ring 2.
An oil outlet switch valve 7 is provided at the upper part of the test chamber 8.
Still include many fixed columns 4, distribute the pterygoid lamina 11 that the multilayer level set up from top to bottom on the lateral wall of laboratory 8, the pterygoid lamina 11 that the multilayer level set up is run through to the vertical setting of fixed column 4, and the bottom of fixed column 4 is parallel with sample platform 10.
The wing plate 11 is provided with an opening for the pipeline to pass through, and the vertical pipeline for communicating the annular space 9 with the hydraulic tank 6 is righted through the opening on the wing plate 11.
The laboratory 8 is a cylindrical laboratory 8, three layers of wing plates 11 are distributed on the outer side wall of the laboratory 8 from top to bottom, and the distance between every two adjacent wing plates 11 is the same.
Each layer comprises at least two wing plates 11, the wing plates 11 are uniformly distributed along the ring, each wing plate 11 correspondingly penetrates through at least one fixed column 4, and the relative positions of each wing plate 11 and the fixed column 4 penetrating through the wing plates 11 are the same.
The inner edge of the wing plate 11 corresponds to the outline of the outer side wall of the cylindrical test chamber 8, and the outer edge is arc-shaped.
The annular sealing ring 2 is a circular rubber ring.
The pressure chamber is mainly used for strength tests and static tests of axial pressure and lateral pressure of coarse-grained soil, rocks, sandy soil and rock pulp such as rockfill materials, sand gravel, gravel-containing cohesive soil and the like, and can measure load, deformation, confining pressure and pore pressure of a sand gravel soil sample with the maximum grain size of 100 mm. Meanwhile, axial and lateral three-dimensional static loads can be applied to the test piece. In the test process, the confining pressure is applied to the liquid oil in the annular wall gap mainly by the gravity of the weight, so that the actual working condition is simulated, and the physical characteristics of the sandy gravel stratum within a certain underground depth range are obtained. Different confining pressures are simulated by controlling the weight of the weight in the test process, the control is easy, the operation is simple, the mutual smooth switching can be realized in the test process, and the function of measuring the change of the test piece body is realized. And is also used for measuring the total shear strength and effective shear strength parameters of coarse-grained soil, fine-grained soil and sandy soil.
The functions of the various components of the laboratory 8 are as follows:
pressurizing piston 1: the device is used for pressurizing an experimental sample and simulating axial load loading of the sample;
top ring seal 2: the dead weight of the piston is balanced, the inner wall of the pressure chamber can be sealed, and pressure leakage of the pressure chamber sealing bin in the axial pressing process is prevented.
Weight plates 3: placing weights, and maintaining the confining pressure of the inner wall at 1MPa through the self weight of the weights;
fixing a column 4: the pressure chamber is axially descended to the sample table 10 and is fixed; the fixing columns 4 are used for fixing the position of the test chamber 8 relative to the sample table 10 and restraining the displacement of the test chamber 8, and the four mutually parallel fixing columns 4 are fixedly connected with the sample table 10 and the test chamber 8, so that the central axes of the test chamber 8 and the sample table 10 can be always coincident, namely, the test chamber 8 is horizontally assembled on the sample table 10 and is positioned on the central axis of the sample table 10 (in a central position). The term "axially downward" means that the central axes of the two coincide with each other, and the bottom surface of the test chamber 8 and the two planes of the upper surface of the sample stage 10 are in a concentric circular relative positional relationship.
A pressure gauge 5: the pressure measuring device is used for measuring the pressure value of hydraulic oil in the pressure chamber;
the hydraulic tank 6: the device is used for injecting hydraulic oil into the annulus 9 of the laboratory 8;
oil outlet on-off valve 7: observing whether the annular space 9 is filled with hydraulic oil or not, and closing the valve when the annular space is filled with hydraulic oil;
a laboratory: placing a sample and providing a channel for pressurizing the piston to move to the sample;
sample stage 10: for placing a sample
Description of the working principle:
during testing, hydraulic oil is injected into an annular space 9 between double walls of a test room 8 through a hydraulic tank 6 until the hydraulic oil comes out of a top oil outlet switch valve 7, and the valve is closed until a pressure gauge 55 is 1MPa, so that the confining pressure of a sample in a real environment is simulated; the film-packed sample is placed on the sample table 10, and the sample chamber is placed on the sample table 10 from the top of the sample, thereby performing a pressurization experiment.
Principle of weight hydraulic tank 6: and hydraulic oil is filled between the double-layer walls, and the gravity of the weight applies pressure to the hydraulic oil, so that confining pressure is applied to the sample chamber, and actual underground confining pressure is simulated. The weight box is provided with a pressure gauge 5 for reading the actual wall internal pressure, thereby achieving the following: the number of the weights is increased or decreased, and the pressure in the chamber is controlled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A pressure chamber for a large-diameter sandy gravel stratum triaxial experiment is characterized by comprising a test chamber, a sample table at the bottom of the test chamber and a pressurizing piston arranged above the test chamber; the top opening of the test chamber is provided with an annular sealing ring, and the inner ring of the annular sealing ring is positioned in the outline of the top opening of the test chamber; the cylinder body of the pressurizing piston is arranged above the test room in a hanging manner, and the piston of the pressurizing cylinder body is inserted into an opening at the top of the test room and is in friction fit with an inner ring of an annular sealing ring arranged at the opening end at the top of the test room; the test chamber is provided with double walls, an annulus is arranged between the double walls, the annulus is communicated with a hydraulic tank through an opening on the outer side wall of the test chamber and a pipeline, and a pressure gauge is arranged on the hydraulic tank; a weight tray is arranged at the top of the hydraulic tank and is connected with a floater in the hydraulic tank through a connecting rod, weights are placed on the weight tray, and the weight tray applies pressure to hydraulic oil in the hydraulic tank and the annulus to simulate confining pressure.
2. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 1, wherein the connecting gap between the sample table and the bottom of the test chamber is sealed by an annular sealing ring.
3. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 1, wherein an oil outlet switch valve is provided at an upper portion of the test chamber.
4. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 1, further comprising a plurality of fixing columns, wherein a plurality of layers of horizontally arranged wing plates are distributed on the outer side wall of the test chamber from top to bottom, the fixing columns are vertically arranged and penetrate through the plurality of layers of horizontally arranged wing plates, and the bottom ends of the fixing columns are parallel to the sample platform.
5. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 4, wherein the wing plate is provided with an opening for the pipeline to pass through, and the vertical pipeline for communicating the annular space with the hydraulic tank is righted through the opening on the wing plate.
6. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 5, wherein the test chamber is a cylindrical test chamber, three layers are distributed above and below the wing plates on the outer side wall of the test chamber, and the distances between the adjacent wing plates are the same.
7. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 6, wherein each layer comprises at least two wing plates, the wing plates are uniformly distributed along the ring, each wing plate correspondingly penetrates through at least one fixed column, and the relative positions of each wing plate and the fixed column penetrating through the wing plates are the same.
8. The pressure chamber for large-diameter sandy gravel stratum triaxial experiment as recited in claim 7, wherein the inner edge of the wing plate corresponds to the outer side wall profile of the cylindrical test chamber, and the outer edge is arc-shaped.
9. The pressure chamber for the large-diameter sandy gravel stratum triaxial experiment as claimed in claim 1 or 2, wherein the annular sealing ring is a circular rubber ring.
CN201920451852.0U 2019-04-04 2019-04-04 Pressure chamber for large-diameter sandy gravel stratum triaxial experiment Active CN210071525U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920451852.0U CN210071525U (en) 2019-04-04 2019-04-04 Pressure chamber for large-diameter sandy gravel stratum triaxial experiment

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Application Number Priority Date Filing Date Title
CN201920451852.0U CN210071525U (en) 2019-04-04 2019-04-04 Pressure chamber for large-diameter sandy gravel stratum triaxial experiment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112051155A (en) * 2020-09-17 2020-12-08 中国地质大学(武汉) Deepwater pressure environment test device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112051155A (en) * 2020-09-17 2020-12-08 中国地质大学(武汉) Deepwater pressure environment test device

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