CN114441331A - Load test device capable of providing three-way pressure - Google Patents
Load test device capable of providing three-way pressure Download PDFInfo
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- CN114441331A CN114441331A CN202210155336.XA CN202210155336A CN114441331A CN 114441331 A CN114441331 A CN 114441331A CN 202210155336 A CN202210155336 A CN 202210155336A CN 114441331 A CN114441331 A CN 114441331A
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- 238000012360 testing method Methods 0.000 title claims abstract description 100
- 239000000463 material Substances 0.000 claims abstract description 77
- 238000012806 monitoring device Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- 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
-
- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0284—Bulk material, e.g. powders
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a load test device capable of providing three-way pressure, which comprises a vertical load test device and a lateral pressure test device, wherein the lateral pressure test device comprises two groups of lateral pressure test devices, each group of pressure test device comprises two tension bags which can be arranged on two opposite side surfaces of a square column test rockfill material, each tension bag is provided with a closed cavity, and the two tension bags are communicated with a pressure system for providing pressure for the tension bags through a connecting pipeline. The load test device can not only carry out vertical load test on the dam body test rockfill material, but also apply lateral pressure to each side face of the square column test rockfill material, so that stress on the opposite side faces is consistent, and dam body deformation can be predicted more truly.
Description
Technical Field
The invention belongs to the technical field of material mechanics tests, and particularly relates to a load test device capable of providing lateral pressure.
Background
At present, the research methods for engineering characteristics such as the strength and deformation of rockfill materials of earth and rockfill dams include field and indoor tests, and conventional indoor tests are difficult to effectively correspond to field damming materials in terms of particle filling structures and sample preparation standards, so that dam body deformation prediction based on indoor test data is greatly distorted. And a large-scale in-situ mechanical test on site is developed to obtain the mechanical parameters of the in-situ primary graded rockfill material, so that the influence caused by the scale effect can be effectively avoided. At present, a conventional field test only applies a vertical load on the top of a tested rockfill material through a load test device, only considers the longitudinal displacement change of the rockfill material under the action of the vertical load, cannot consider lateral pressure, and cannot truly predict dam body deformation.
Disclosure of Invention
Since the test rockfill material has a cylindrical structure and a square cylindrical structure, the cylindrical test rockfill material has only one circular side surface, which requires that lateral pressures applied to the side surfaces be uniform; the square column test rockfill material is provided with four side surfaces in different directions, and the four side surfaces are divided into two groups if two opposite side surfaces are one group; the lateral pressure exerted by the two groups of side surfaces of the square column test rockfill material can be the same or different, and only the lateral pressure of one group of opposite two side surfaces of the square column test rockfill material is required to be consistent, otherwise, the test rockfill material can incline to one side to cause test distortion. The invention is developed aiming at a structure for applying lateral pressure on four side surfaces of a square column test rockfill material.
The invention aims at the piling materials in the square column test, provides a load test device capable of providing three-way pressure, provides a lateral pressure test device on the basis of the original vertical load device, and the vertical load device and the lateral pressure test device are of independent device structures and are matched with each other for use during the test, so that the lateral pressure between soil bodies can be effectively provided, the real filling state of the piling materials of the dam body is simulated, and the deformation of the dam body can be more accurately predicted.
In order to achieve the purpose, the technical scheme provided by the invention is that the load testing device capable of providing three-way pressure comprises a vertical load testing device and two groups of lateral pressure testing devices, wherein the two groups of lateral pressure testing devices are respectively arranged on two opposite side surfaces of a square column-shaped test rockfill material, each group of lateral pressure testing devices comprises two tension bags respectively arranged on two opposite side surfaces of the test rockfill material, each tension bag is provided with a closed cavity, and the two tension bags are communicated with a pressure system for providing pressure for the tension bags through a connecting pipeline.
Preferably, the connecting pipeline comprises a main connecting pipeline shared by the two tension bags and a branch connecting pipeline communicated with the tension bags, and the branch connecting pipeline is connected with the main connecting pipeline.
Preferably, a control valve and a pressure gauge are arranged on the main connecting pipeline, and the pressure gauge is arranged on the main connecting pipeline between the control valve and the pressure system.
Preferably, the pressure system delivers water or air to the tension bag, and forms water pressure or air pressure in the tension bag.
Preferably, the connecting pipeline is a steel pipe, the thickness of the pipe is 20mm, and the diameter of the pipe is 50-100 mm.
Preferably, the vertical load testing device comprises a vertical force transfer device positioned at the top of the test rockfill material and a monitoring device positioned at the bottom of the test rockfill material.
Preferably, the monitoring device comprises a sensor positioned at the bottom of the test rockfill material, the sensor being connected to a monitoring system.
Preferably, when in test, the periphery of the test rockfill material is piled with rockfill material, the tension bag is arranged between the test rockfill material and the rockfill material, and the thickness of the test rockfill material is the same as that of the rockfill material.
Preferably, the length and width of the rockfill material is more than 5 times the side length of the test rockfill material.
The load test device respectively tests the lateral pressure of the two opposite side surfaces of the square column test rockfill material through two groups of lateral pressure test devices arranged on the two opposite sides of the square column test rockfill material, the tension bag 2 ensures the consistency of the pressure of the two opposite side surfaces of the square column test rockfill material, the tension bag 3 ensures the consistency of the pressure of the other two opposite side surfaces of the square column test rockfill material, and the lateral pressures provided by the tension bag 2 and the tension bag 3 to the side surfaces of the test rockfill material where the tension bag is arranged can be the same or different; meanwhile, a conventional load test system is used for providing a vertical pressure test of the tested rockfill material, a real dam rockfill material filling state can be simulated through a three-dimensional pressure test, the dam deformation can be accurately predicted, and the method is simple and convenient to operate and does not influence the test material layering rolling process.
Drawings
FIG. 1 is a schematic top view of the experimental apparatus.
Detailed Description
With respect to the above technical solutions, preferred embodiments are described in detail with reference to the drawings.
Referring to fig. 1, a square column-shaped test rockfill material 1 with the side length of 1-2 m is laid on a test site, and a group of lateral pressure testing devices are respectively arranged on two opposite side surfaces of the test rockfill material 1. A group of lateral pressure test device includes that the laminating sets up two tension bags 2 on experimental rockfill material 1 relative both sides face, and a side sets up a tension bag 2, and tension bag 2 has closed cavity structure, covers outside the side completely. The tension bag 2 is a closed cavity formed of an impermeable geosynthetic material, which is required to have sufficient tensile strength and impermeability, such as polyvinyl chloride. The two tension bags 2 communicate with the pressure system 10 via branch connecting lines 5 and a main connecting line 4. The main connecting pipeline 4 and the branch connecting pipelines 5 are steel pipes, and are made of Q345 and have the thickness of 20mm and the diameter of 50-100 mm. A control valve 8, a pressure gauge 9 and a pressure system 10 are arranged on the main connecting pipeline 4, and the pressure gauge 9 is positioned between the pressure system 10 and the control valve 8. The pressure system 10 provides pressure to the tension bag 2 via the main connecting line 4 and the branch connecting lines 5, and the pressure can be provided by supplying water or gas to the tension bag 2. The pressure system 10 is a water pump or a compressed air pump. The control valve 8 controls the disconnection of the main connecting pipeline 4; the pressure gauge 9 monitors the pressure of the tension bag 2.
The other group of lateral pressure testing devices comprises two tension bags 3 arranged on the other two opposite side surfaces of the tested rockfill material, and the two tension bags 3 are respectively communicated with a pressure system 13 through branch connecting pipelines 7 and a main connecting pipeline 6. The main connecting pipeline 6 and the branch connecting pipelines 7 are steel pipes, and are made of Q345 and have the thickness of 20mm and the diameter of 50-100 mm. A control valve 11 and a pressure gauge 12 are arranged on the main connecting pipeline 6, and the pressure gauge 12 is positioned between a pressure system 13 and the control valve 11. The pressure system 13 supplies pressure to the tension bag 3 via the main connecting line 6 and the branch connecting lines 7, which pressure supply can be achieved by supplying water or gas into the tension bag 3. The pressure system 13 is a water pump or a compressed air pump. The control valve 11 controls the opening and closing of the main connecting pipeline 6; the pressure gauge 12 monitors the pressure level of the tension bag 3.
The bottom of the test rockfill material 1 is paved with a monitoring device for monitoring stress and deformation in all directions. The monitoring device comprises a sensor 14, which can be a plurality of sets of sensors, arranged at the bottom of the test rockfill material 1, and is mainly used for measuring all-directional deformation and stress, namely all-directional displacement. The sensor 14 is connected to a monitoring system 15. The sensor 14 is used for detecting the stress, the all-directional deformation and the like of the test rockfill material 1 and transmitting the monitoring information to the monitoring system 14.
The test rockfill material 1, the tension bag 2, the tension bag 3, a part of the main connecting pipelines (4, 6), the branch connecting pipelines (5, 7) and the sensor 14 are all embedded in a rockfill material 16. The trial rockfill material 1 is the same thickness as the rockfill material 16. The periphery of the rockfill material 16 is free, and the length and the width of the rockfill material are more than 5 times of the side length of the tested rockfill material 1. The control valves (8, 11), the pressure meters (9, 12), the pressure systems (10, 13), the monitoring system 15 and parts of the main connecting pipelines (4, 6) are respectively positioned outside the rockfill material 16.
The vertical load testing device generally comprises a vertical force transmission device for providing vertical load for a tested rockfill material and a monitoring device for testing displacement and stress. Since the vertical load testing device is the prior art, the description is omitted here.
During testing, a conventional vertical load force transfer device is arranged at the top of the tested rockfill material 1, vertical pressure is provided for the tested rockfill material 1 through the vertical load force transfer device, and test data of stress and all-directional deformation, namely displacement, are obtained through a monitoring device; meanwhile, certain pressure is provided for the tension bags (2 and 3) through the connecting pipelines by the pressure systems (10 and 13), lateral pressure is provided for each side face of the tested rockfill material by the tension bags (2 and 3), lateral compression of the tested rockfill material is simulated, the lateral pressure provided by the tension bag 2 to the opposite two sides of the tested rockfill material 1 corresponding to the tension bag can be consistent with or different from the lateral pressure provided by the tension bag 3 to the opposite two side faces of the tested rockfill material 1 corresponding to the tension bag, and therefore the test condition of the tested rockfill material is ensured to be closer to indoor test; by applying vertical load and two groups of lateral pressure to the tested rockfill material, the deformation of the dam body can be predicted more truly.
Claims (9)
1. The utility model provides a can provide load test device of three-dimensional pressure, its characterized in that, load test device includes vertical load testing arrangement and two sets of side direction pressure testing arrangement, sets up a set of side direction pressure testing arrangement respectively at the experimental rockfill material of square column shape relative both sides face, and every group side direction pressure testing arrangement is including setting up two pulling force bags at experimental rockfill material's relative two sides respectively, the pulling force bag has closed cavity, and two pulling force bags are through connecting tube and the pressure system intercommunication that provides pressure for it.
2. The load testing device of claim 1, wherein the connecting conduit comprises a common connecting conduit for the two tension bags and a branch connecting conduit in communication with the tension bags, the branch connecting conduit being connected to the common connecting conduit.
3. The load testing device according to claim 2, wherein a control valve and a pressure gauge are provided on the main connection line, the pressure gauge being located on the main connection line between the control valve and the pressure system.
4. The load testing device of claim 1, wherein the pressure system delivers water or air to the tension bag, creating water or air pressure within the tension bag.
5. The load test device according to claim 1, wherein the connecting pipeline is a steel pipe, the pipe thickness is 20mm, and the diameter is 50-100 mm.
6. A load testing device as claimed in claim 1, wherein the vertical load testing means comprises a vertical force transfer device at the top of the test rockfill material and a monitoring device at the bottom of the test rockfill material.
7. The load testing device of claim 6, wherein the monitoring device comprises a sensor located at the bottom of the test rockfill material, the sensor being connected to the monitoring system.
8. The load tester as claimed in any one of claims 1 to 7, wherein the periphery of the test rockfill material is piled with rockfill material during testing, the tension bag is between the test rockfill material and the rockfill material, and the thickness of the test rockfill material is the same as that of the rockfill material.
9. A load testing apparatus as claimed in any one of claims 1 to 7, wherein the length and width of the rockfill material is more than 5 times the side length of the rockfill material to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210155336.XA CN114441331A (en) | 2022-02-21 | 2022-02-21 | Load test device capable of providing three-way pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210155336.XA CN114441331A (en) | 2022-02-21 | 2022-02-21 | Load test device capable of providing three-way pressure |
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| Publication Number | Publication Date |
|---|---|
| CN114441331A true CN114441331A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210155336.XA Pending CN114441331A (en) | 2022-02-21 | 2022-02-21 | Load test device capable of providing three-way pressure |
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| CN (1) | CN114441331A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323983A (en) * | 2022-02-21 | 2022-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Load test device capable of providing lateral pressure |
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| JPH0735663A (en) * | 1993-07-19 | 1995-02-07 | Fujita Corp | Apparatus for three-axial compression test in situ |
| JPH09209349A (en) * | 1996-02-06 | 1997-08-12 | Fujita Corp | Method for testing strength of rockbed at original position |
| JPH11152983A (en) * | 1997-11-19 | 1999-06-08 | Central Res Inst Of Electric Power Ind | Original position hole bottom three-axial compression test method |
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| CN101441208A (en) * | 2008-12-19 | 2009-05-27 | 河海大学 | True triaxial instrument of deformation without side direction interference |
| JP2011107049A (en) * | 2009-11-19 | 2011-06-02 | Central Res Inst Of Electric Power Ind | Method and apparatus for conducting original position bedrock tensile test |
| CN202383024U (en) * | 2011-11-24 | 2012-08-15 | 长江水利委员会长江科学院 | Large-sized true triaxial test equipment |
| CN104897467A (en) * | 2015-07-01 | 2015-09-09 | 山东理工大学 | True-triaxial loading and unloading rock stress relaxation test device and test method |
| CN109632479A (en) * | 2018-12-14 | 2019-04-16 | 华北水利水电大学 | A kind of true triaxial dynamic pressure testing machine and test method |
| CN110243681A (en) * | 2019-06-21 | 2019-09-17 | 中国电建集团西北勘测设计研究院有限公司 | A kind of Coarse Aggregate original position load test determines the method and application of Particle Breakage rate |
| CN215296993U (en) * | 2021-03-12 | 2021-12-24 | 中国电建集团西北勘测设计研究院有限公司 | Multi-connected rock-soil in-situ shear testing device for full-stress path tracking |
| CN114323983A (en) * | 2022-02-21 | 2022-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Load test device capable of providing lateral pressure |
-
2022
- 2022-02-21 CN CN202210155336.XA patent/CN114441331A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0735663A (en) * | 1993-07-19 | 1995-02-07 | Fujita Corp | Apparatus for three-axial compression test in situ |
| JPH09209349A (en) * | 1996-02-06 | 1997-08-12 | Fujita Corp | Method for testing strength of rockbed at original position |
| JPH11152983A (en) * | 1997-11-19 | 1999-06-08 | Central Res Inst Of Electric Power Ind | Original position hole bottom three-axial compression test method |
| CN1945268A (en) * | 2006-10-23 | 2007-04-11 | 中国矿业大学(北京) | Real three shaft pressure box |
| CN101169356A (en) * | 2007-11-15 | 2008-04-30 | 西安理工大学 | Triaxial independent loading pressure chamber structure true triaxial apparatus |
| CN101441208A (en) * | 2008-12-19 | 2009-05-27 | 河海大学 | True triaxial instrument of deformation without side direction interference |
| JP2011107049A (en) * | 2009-11-19 | 2011-06-02 | Central Res Inst Of Electric Power Ind | Method and apparatus for conducting original position bedrock tensile test |
| CN202383024U (en) * | 2011-11-24 | 2012-08-15 | 长江水利委员会长江科学院 | Large-sized true triaxial test equipment |
| CN104897467A (en) * | 2015-07-01 | 2015-09-09 | 山东理工大学 | True-triaxial loading and unloading rock stress relaxation test device and test method |
| CN109632479A (en) * | 2018-12-14 | 2019-04-16 | 华北水利水电大学 | A kind of true triaxial dynamic pressure testing machine and test method |
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| CN215296993U (en) * | 2021-03-12 | 2021-12-24 | 中国电建集团西北勘测设计研究院有限公司 | Multi-connected rock-soil in-situ shear testing device for full-stress path tracking |
| CN114323983A (en) * | 2022-02-21 | 2022-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Load test device capable of providing lateral pressure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323983A (en) * | 2022-02-21 | 2022-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Load test device capable of providing lateral pressure |
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