CN108362728B - Indoor test system for three-dimensional expansion deformation of modified soil in cold region - Google Patents
Indoor test system for three-dimensional expansion deformation of modified soil in cold region Download PDFInfo
- Publication number
- CN108362728B CN108362728B CN201810055712.1A CN201810055712A CN108362728B CN 108362728 B CN108362728 B CN 108362728B CN 201810055712 A CN201810055712 A CN 201810055712A CN 108362728 B CN108362728 B CN 108362728B
- Authority
- CN
- China
- Prior art keywords
- sample
- bottom plate
- base bottom
- flitch
- deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 title claims abstract description 21
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000008602 contraction Effects 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 10
- 238000007710 freezing Methods 0.000 claims description 10
- 238000010257 thawing Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
Landscapes
- 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 relates to a three-dimensional expansion deformation indoor test system for modified soil in a cold region, which is characterized in that: the outer side edge of the base bottom plate is respectively provided with a front leveling bubble and a side leveling bubble, four correction foot posts which enable the base bottom plate to be in a horizontal state are arranged below the base bottom plate, and the base bottom plate can be in the horizontal state by adjusting the four correction foot posts below the base bottom plate; two sliding rails are arranged under the right center of the base bottom plate, and are respectively and correspondingly welded and fixed on the middle reference column of the peripheral frame in a cross staggered arrangement mode; the four side flitch plates for measuring deformation correspond to each other in pairs, are respectively connected with a fixed support through a slide block and two crossed slide rails to form an integral body which cannot be disassembled, wherein the side flitch plates are of a grid structure; the device can perform simulation measurement of three-dimensional expansion deformation of the cold region embankment soil body under the temperature change, has good test integrity, simple and convenient operation and wide application range, and can be adjusted according to the type, the water content, the compactness and the like of the soil body.
Description
Technical Field
The invention relates to a rock-soil test system which is specially suitable for indoor test of the three-dimensional frost heaving rate of modified soil of an embankment in a cold region.
Background
A large amount of high-grade roads, railways and other line engineering inevitably pass through seasonal frozen soil areas and areas with large day and night temperature difference, inherit the principle of local material taking, some geotechnical materials need to be modified and processed for embankment filling, if materials such as aeolian sand added with cement are modified, but embankment engineering processed by the modification can generate expansion and contraction deformation in the freezing and thawing process, a plurality of unfavorable engineering geological problems such as cracks and thaw collapse occur, and hidden dangers are brought to cold area engineering. Therefore, the test of the three-dimensional expansion and contraction deformation of the modified soil in the cold region under the freeze-thaw state is especially important by simulating the outdoor environment. At present, measurement of expansion and contraction deformation in a soil body chamber is mainly focused on one-dimensional and two-dimensional devices, namely, a sample is assumed to be planar, and influence caused by the fact that the sample is three-dimensional is ignored, for example, patent CN203755286U, which can only measure frost heaving change in the vertical direction, the measurement is single, and data is not complete enough; for another example, patent CN202057647U, although the measurement and refrigeration are integrated, the temperature is not easy to control, and is only limited to negative temperature, and the adoption of freon refrigeration does not meet the environmental protection concept. The cold region soil body, especially the cold region embankment filling body, is not only influenced by one-dimensional or two-dimensional temperature change, but is mostly in a three-dimensional temperature environment, and the freeze-thaw deformation amount is in a three-dimensional state. The invention provides an indoor test device for measuring the three-dimensional expansion and contraction deformation of a soil body in a cold area, solves the problem that the three-dimensional frost heaving rate of the soil body cannot be measured in the current indoor state, and provides an important scientific basis for the engineering construction of high-grade lines in the cold area.
Disclosure of Invention
The invention provides an indoor test device for measuring the three-dimensional expansion and contraction deformation of a cold region soil body in order to measure the three-dimensional expansion and contraction deformation of the cold region soil body in a freeze-thaw state.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an indoor test system of modified soil three-dimensional breathing deformation in cold district which characterized in that:
the outer side edge of the base bottom plate is respectively provided with a front leveling bubble and a side leveling bubble, four correcting foot columns which enable the base bottom plate to be in a horizontal state are arranged below the base bottom plate,
the base bottom plate can be in a horizontal state by adjusting the four correcting foot columns under the base bottom plate;
two sliding rails are arranged under the right center of the base bottom plate, and are respectively and correspondingly welded and fixed on the middle reference column of the peripheral frame in a cross staggered arrangement mode;
the four side flitch plates for measuring deformation correspond to each other in pairs, are respectively connected with a fixed support through a slide block and two crossed slide rails to form an integral body which cannot be disassembled, wherein the side flitch plates are of a grid structure;
before testing, two side flitches are rigidly connected with an upper sliding rail bracket (5), the part is connected with an upper sliding rail (9) through an upper sliding rail sliding block (7) in a sliding way, an upper sliding rail spring (11) is installed between the two upper sliding rail sliding blocks (7), three groups of symmetrical surfaces, namely an upper group, a lower group, a front group, a rear group and a left group, are marked on a sample (22), strain gages are pasted at the centers of the front and rear symmetrical surfaces, after the strain gages are firmly bonded, the sample (22) is placed on a base bottom plate (15), the side flitches (20) are ensured to be fully contacted with the left and right surfaces of the sample (22), the average accumulated strain within 2 minutes after 20 times of reciprocating measurement is less than or equal to 50 mu epsilon, and the spring elastic coefficient and the connection; similarly, the other two side pasting plates are rigidly connected with the lower sliding rail bracket (6), the other side pasting plates are connected with the lower sliding rail (10) in a sliding mode through the lower sliding rail sliding blocks (8), the lower sliding rail spring (12) is installed between the two lower sliding rail sliding blocks (8), and the elastic coefficient and the connection length of the lower sliding rail spring (12) are consistent with those of the upper sliding rail spring (11).
Furthermore, the side flitch plate material is an aluminum plate with a large heat conductivity coefficient, meanwhile, the side length of the periphery of the flitch plate is smaller than the side length of the test piece, the side length of the bottom plate is larger than the side length of the test piece, and the bottom plate material is invar steel with a small heat conductivity coefficient.
When the temperature is reduced, the sample is frozen and contracted, the side flitch is tightly attached to the sample by virtue of elastic restoring force, and the contraction deformation is measured; when the temperature rises, the sample expands;
placing a standard sample (22) in the center of a base bottom plate (15), enabling four side flitch plates to be in precise contact with the standard sample, enabling one ends of telescopic heads of four side sensors to be tightly attached to a contact area of the side flitch plates, fixing tail ends of the side sensors on a middle reference column (18) of a peripheral frame, placing an upper flitch plate (19), enabling one ends of the telescopic heads of the upper sensors to be tightly attached to the contact area of the upper flitch plate (19), fixing the tail ends of the upper sensors at the center of an upper cover (16) of the peripheral frame, placing the upper cover of the peripheral frame, and enabling the telescopic heads of the five sensors to be compressed to a half of the length of the telescopic heads of the five sensors by adjusting five tail;
the three-dimensional testing device is placed in a freezing and thawing environment box, when the temperature rises, the sample is subjected to expansion deformation, so that the side flitch slides on the upper and lower slide rails, at the moment, the side sensor measures the expansion deformation of the sample in two horizontal directions by measuring the tiny horizontal displacement of the flitch, and the upper flitch generates vertical displacement under the action of expansion force to measure the expansion deformation of the sample in the vertical direction; when the temperature is reduced, the sample is subjected to shrinkage deformation, the side flitch is in close contact with the sample through the horizontal elastic restoring force of the spring between the sliders, the sensor measures the shrinkage deformation of the sample in two horizontal directions by measuring the shrinkage horizontal displacement of the flitch, and the upper flitch can be displaced downwards under the action of gravity to measure the shrinkage deformation of the sample in the vertical direction.
The invention has the beneficial effects that:
the device can perform simulation measurement of three-dimensional expansion and contraction deformation under temperature change on cold region embankment soil bodies indoors, is good in test integrity, simple and convenient to operate, wide in application range, capable of performing bidirectional elastic adjustment according to different types of test pieces such as soil body types, water content and compactness, capable of continuously collecting expansion and contraction deformation data under different freezing and thawing cycle effects, different freezing and thawing temperature effects and different freezing and thawing rates, high in precision and good in executable rate. Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention
FIG. 2 is a front view of the present invention
FIG. 3 is a side view of the present invention
FIG. 4 is a top view of the present invention
FIG. 5 is a base plate of the present invention
FIG. 6 is a test set-up of the present invention
FIG. 7 is a cross-sectional view of the present invention
Structural description:
in the figure, 1, an upper sensor, 2, a side sensor, 3, an upper sensor fixed end, 4, a side sensor fixed end, 5, an upper sliding rail support, 6, a lower sliding rail support, 7, an upper sliding rail sliding block, 8, a lower sliding rail sliding block, 9, an upper sliding rail, 10, a lower sliding rail, 11, an upper sliding rail spring, 12, a lower sliding rail spring, 13, a front horizontal bubble, 14, a side horizontal bubble, 15, a base bottom plate, 16, an outer frame upper cover, 17, an outer frame, 18, a middle reference column, 19, an upper pasting plate, 20, a side pasting plate, 21, a correction foot column, 22, a sample and a sample are arranged in sequence, and the upper sensor
The specific implementation mode is as follows:
the outer side edge of the base bottom plate is respectively provided with a front leveling bubble and a side leveling bubble, and the base bottom plate can be in a horizontal state by adjusting four correction stilts below the base bottom plate; in order to ensure that the device can measure the transverse bidirectional deformation simultaneously, two slide rails are arranged under the right center of the base bottom plate, and are respectively and correspondingly welded and fixed on a middle reference column of the peripheral frame in a cross staggered arrangement mode; the method comprises the following steps that four side flitch plates for measuring deformation correspond to each other in pairs, are respectively connected with a fixed support through a sliding block and smooth upper and lower sliding rails and are connected into an integral body which cannot be detached, wherein the side flitch plates are mainly characterized by being of a grid structure, are made of aluminum plates with high heat conductivity coefficients, are 20mm in width and 2mm in thickness, so that the deformation coordination of a sample and the flitch plates can be ensured, and the temperature can be well transferred; between two sliding blocks in the smooth guide rail, a spring with a smaller elastic coefficient is installed, and the spring is characterized in that: when a sample is installed, the spring is in a stretching state, a certain tensile force exists between the two sliding blocks, the flitch is ensured to be fully contacted with the sample, but the sample cannot generate excessive strain under the action of bidirectional flitch extrusion force, namely, during testing, transverse strain gages (BX120-60AA) are stuck on two surfaces of the sample without the flitch, and the average accumulated strain is less than or equal to 50 mu epsilon after 20 times of reciprocating measurement for 2 min. When the temperature is reduced, the sample is frozen and contracted, the side flitch is tightly attached to the sample by virtue of elastic restoring force, and the contraction deformation is measured; when the temperature rises, the sample expands, the spring has little influence on the temperature deformation of the sample, and in the same way, the spring mounting step is repeated in the lower sliding rail; hug closely the induction zone of lateral part flitch with lateral part sensor one end, and reserve enough flexible length, fix the tail end of sensor on peripheral frame's middle part reference post, it is fixed with the sensor afterbody through the lateral part sensor stiff end on the middle part reference post, put into this three-dimensional breathing deformation measuring device with standard sample, place the upper portion flitch, install the sensor fixed end department at the upper portion flitch with upper portion sensor, place the peripheral frame upper cover, to high low temperature's suitability in order to improve test system, it is more true to make the analog environment, the sensor chooses for use low temperature resistant sensor (-30 ℃), two-way flexible side head, range 5 mm. The three-dimensional testing device is placed in a freezing and thawing environment box, when the temperature rises, the sample generates expansion deformation, the side flitch is caused to slide on an upper sliding rail and a lower sliding rail, and at the moment, the expansion deformation of the sample is measured by the sensor through measuring the tiny displacement of the flitch; when the temperature is reduced, the sample is frozen and deformed, the side flitch is in close contact with the sample through the elastic restoring force of the springs between the sliding blocks, the sensor measures the shrinkage deformation of the sample through measuring the shrinkage displacement of the flitch, and when the three-dimensional deformation rule of the sample under the condition of multiple freezing and thawing is tested, the test system can ensure the continuity of test data and the integrity of the test sample.
In fig. 5, four straightening legs (21) are adjusted on the base bottom plate (15) to center the front side leveling bubble (13) on the outer edge of the base bottom plate (15) and also to center the side leveling bubble (14) to make the base bottom plate (15) in a horizontal state.
In fig. 6, the side flitch (20) is rigidly connected to the upper rail bracket (5) and this part is connected to the upper rail (9) by the upper rail slider (7) in a sliding manner. An upper sliding rail spring (11) is arranged between two upper sliding rail sliding blocks (7); similarly, the side pasting plate (20) is rigidly connected with the lower sliding rail bracket (6), the side pasting plate is connected with the lower sliding rail (10) in a sliding manner through the lower sliding rail sliding blocks (8), and the lower sliding rail spring (12) is arranged between the two lower sliding rail sliding blocks (8).
In fig. 7, the upper and lower slide rails (9), (10) are arranged in a crisscross staggered manner and are respectively and rigidly connected to a middle reference column (18); the side sensor (2) is connected to the middle reference column (18) and fixed by the side sensor fixing end (4). An upper patch (19) is placed above the sample, and the upper sensor (1) is brought into close contact with the upper patch (19), and the upper sensor fixing end (3) is fixed to the peripheral frame upper cover (16), so that the entire outer frame is closed.
The working process is as follows:
a soil sample (22) is placed in the center of a base bottom plate (15), a side pasting plate (20) is tightly pasted with the sample (22), an upper pasting plate (19) is placed in the center of the sample (22), and all sensors are connected. The device is integrally arranged in a freezing and thawing environment box, when the temperature rises or falls, and a sample expands or contracts, the upper pasting plate (19) and the side pasting plate (20) can move, and the upper sensor (1) and the side sensor (2) arranged on the upper pasting plate and the side pasting plate can acquire movement deformation to reflect the freezing and thawing deformation rule of the soil body in the cold region, so that quality guarantee is provided for the construction of high-grade cold region line engineering.
Claims (1)
1. A three-dimensional expansion deformation indoor test method for modified soil in cold regions is disclosed, and the system applied by the method specifically comprises the following steps:
the outer side edge of the base bottom plate is respectively provided with a front leveling bubble and a side leveling bubble, four correcting foot columns which enable the base bottom plate to be in a horizontal state are arranged below the base bottom plate,
the base bottom plate can be in a horizontal state by adjusting the four correcting foot columns under the base bottom plate;
two sliding rails are arranged under the right center of the base bottom plate, and are respectively and correspondingly welded and fixed on the middle reference column of the peripheral frame in a cross staggered arrangement mode;
the four side flitch plates for measuring deformation correspond to each other in pairs, are respectively connected with a fixed support through a slide block and two crossed slide rails to form an integral body which cannot be disassembled, wherein the side flitch plates are of a grid structure;
before testing, two side flitches are rigidly connected with an upper sliding rail bracket (5), the part is connected with an upper sliding rail (9) through an upper sliding rail sliding block (7) in a sliding way, an upper sliding rail spring (11) is installed between the two upper sliding rail sliding blocks (7), three groups of symmetrical surfaces, namely an upper group, a lower group, a front group, a rear group and a left group, are marked on a sample (22), strain gages are pasted at the centers of the front and rear symmetrical surfaces, after the strain gages are firmly bonded, the sample (22) is placed on a base bottom plate (15), the side flitches (20) are ensured to be fully contacted with the left and right surfaces of the sample (22), the average accumulated strain within 2 minutes after 20 times of reciprocating measurement is less than or equal to 50 mu epsilon, and the spring elastic coefficient and the connection; similarly, the other two side pasting plates are rigidly connected with the lower slide rail bracket (6), the other side pasting plates are connected with the lower slide rail (10) in a sliding manner through the lower slide rail sliding blocks (8), the lower slide rail spring (12) is arranged between the two lower slide rail sliding blocks (8), and the elastic coefficient of the lower slide rail spring (12) is consistent with that of the upper slide rail spring (11); the connection length of the lower slide rail spring (12) is consistent with that of the upper slide rail spring (11);
the method is characterized in that: when the temperature is reduced, the sample is frozen and contracted, the side flitch is tightly attached to the sample by virtue of elastic restoring force, and the contraction deformation is measured; when the temperature rises, the sample expands;
placing a standard sample (22) in the center of a base bottom plate (15), enabling four side flitch plates to be in precise contact with the standard sample, enabling one ends of telescopic heads of four side sensors to be tightly attached to a contact area of the side flitch plates, fixing tail ends of the side sensors on a middle reference column (18) of a peripheral frame, placing an upper flitch plate (19), enabling one ends of the telescopic heads of the upper sensors to be tightly attached to the contact area of the upper flitch plate (19), fixing the tail ends of the upper sensors at the center of an upper cover (16) of the peripheral frame, placing the upper cover of the peripheral frame, and enabling the telescopic heads of the five sensors to be compressed to a half of the length of the telescopic heads of the five sensors by adjusting five tail;
the three-dimensional testing device is placed in a freezing and thawing environment box, when the temperature rises, the sample is subjected to expansion deformation, so that the side flitch slides on the upper and lower slide rails, at the moment, the side sensor measures the expansion deformation of the sample in two horizontal directions by measuring the tiny horizontal displacement of the flitch, and the upper flitch generates vertical displacement under the action of expansion force to measure the expansion deformation of the sample in the vertical direction; when the temperature is reduced, the sample is subjected to shrinkage deformation, the side flitch is in close contact with the sample through the horizontal elastic restoring force of the spring between the sliders, the sensor measures the shrinkage deformation of the sample in two horizontal directions by measuring the shrinkage horizontal displacement of the flitch, and the upper flitch can be displaced downwards under the action of gravity to measure the shrinkage deformation of the sample in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810055712.1A CN108362728B (en) | 2018-01-19 | 2018-01-19 | Indoor test system for three-dimensional expansion deformation of modified soil in cold region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810055712.1A CN108362728B (en) | 2018-01-19 | 2018-01-19 | Indoor test system for three-dimensional expansion deformation of modified soil in cold region |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108362728A CN108362728A (en) | 2018-08-03 |
| CN108362728B true CN108362728B (en) | 2020-04-28 |
Family
ID=63006465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810055712.1A Expired - Fee Related CN108362728B (en) | 2018-01-19 | 2018-01-19 | Indoor test system for three-dimensional expansion deformation of modified soil in cold region |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108362728B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110567428B (en) * | 2019-09-12 | 2021-04-09 | 东北电力大学 | Frozen expansive soil body displacement detection device and installation method thereof |
| CN111398049A (en) * | 2020-03-24 | 2020-07-10 | 河海大学 | Device for testing bidirectional thermal shrinkage stress and frost heaving stress of frozen water-containing asphalt mixture |
| WO2023277853A2 (en) * | 2021-06-30 | 2023-01-05 | Eskisehir Teknik Universitesi | Volume change measuring apparatus for frozen porous media |
| CN114646753A (en) * | 2021-12-24 | 2022-06-21 | 中铁二十四局集团有限公司 | Concrete expansion and shrinkage deformation testing system in curing period |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2196301Y (en) * | 1994-05-27 | 1995-05-03 | 西安交通大学 | Measuring apparatus for film thermal coefficient of expansion |
| JP3503927B2 (en) * | 1998-09-07 | 2004-03-08 | 財団法人電力中央研究所 | Triaxial cell, triaxial test apparatus and triaxial test method |
| CN101178395A (en) * | 2007-12-05 | 2008-05-14 | 中国科学院武汉岩土力学研究所 | Non-contact type rock three-way shrinkage test device and test method |
| CN103543250A (en) * | 2013-10-29 | 2014-01-29 | 上海大学 | Undisturbed three-way contraction testing device |
| CN204854605U (en) * | 2015-04-24 | 2015-12-09 | 温州大学 | Survey device is warp in breathing of concrete solid structure |
| CN205941548U (en) * | 2016-07-22 | 2017-02-08 | 中交一公局厦门工程有限公司 | Trapped orbit formula concrete shrinkage test device |
-
2018
- 2018-01-19 CN CN201810055712.1A patent/CN108362728B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2196301Y (en) * | 1994-05-27 | 1995-05-03 | 西安交通大学 | Measuring apparatus for film thermal coefficient of expansion |
| JP3503927B2 (en) * | 1998-09-07 | 2004-03-08 | 財団法人電力中央研究所 | Triaxial cell, triaxial test apparatus and triaxial test method |
| CN101178395A (en) * | 2007-12-05 | 2008-05-14 | 中国科学院武汉岩土力学研究所 | Non-contact type rock three-way shrinkage test device and test method |
| CN103543250A (en) * | 2013-10-29 | 2014-01-29 | 上海大学 | Undisturbed three-way contraction testing device |
| CN204854605U (en) * | 2015-04-24 | 2015-12-09 | 温州大学 | Survey device is warp in breathing of concrete solid structure |
| CN205941548U (en) * | 2016-07-22 | 2017-02-08 | 中交一公局厦门工程有限公司 | Trapped orbit formula concrete shrinkage test device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108362728A (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108362728B (en) | Indoor test system for three-dimensional expansion deformation of modified soil in cold region | |
| CN105954103B (en) | Synchronous testing device and method for tensile modulus, compressive modulus and flexural modulus of pavement material | |
| CN109839315B (en) | Bidirectional sliding type physical model box and cross-fault tunnel mechanical behavior testing method | |
| CN103439190B (en) | Paving steel bridge deck cracking resistance evaluation experimental device | |
| CN109388865B (en) | Tower emergency failure early warning method under ground settlement working condition | |
| CN102519812B (en) | Method for evaluating high-temperature stability of asphalt pavement structure or asphalt mixture | |
| CN206038427U (en) | Synchronous testing device for tensile, compression and bending-pulling resilience modulus of pavement material | |
| CN110847259A (en) | Anti-slide pile-transparent soil slope system test device based on PIV and close-range photography technology and deformation measurement method | |
| CN110188443A (en) | A kind of Study of Landslides is surged the model test apparatus and test method of energy dissipating effect and wave height prediction | |
| CN105674906A (en) | Shrinkage deformation tester for road material at full age and using method of tester | |
| CN103604409A (en) | Newly-poured concrete floor slab overall shrinkage constraint deformation measuring method | |
| CN111398049A (en) | Device for testing bidirectional thermal shrinkage stress and frost heaving stress of frozen water-containing asphalt mixture | |
| Ansell et al. | A cyclic simple shear apparatus for dry granular materials | |
| CN108614073B (en) | Double-track roadbed scale test model system considering boundary effect | |
| CN117268690A (en) | Bilinear hysteresis vibration isolation system and aeroelastic model wind tunnel test device | |
| CN113916114A (en) | Pipeline deformation monitoring test device | |
| CN106525596B (en) | Lateral bedding counter-force coefficient indoor test device under different stress paths | |
| KR100796636B1 (en) | Measurement Appratus of Longitudinal Displacement of Prestressed Concrete Bridge | |
| CN209263864U (en) | A kind of height measuring device | |
| CN218765897U (en) | Test device for simulating bearing characteristics of different-occurrence-state fracture zone dislocation pile foundations | |
| CN202486036U (en) | Bamboo joint type high-precision determination device for free expansion ratio of rock | |
| CN106625779A (en) | Performance test platform and test method of dynamic response for footling bionic robots | |
| CN204679253U (en) | Air spring testing device | |
| Levenberg et al. | Estimating the coefficient of at-rest earth pressure in granular pavement layers | |
| CN215180177U (en) | Model test device for simulating tunnel deformation caused by underground water level change |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200428 |