CN108572189A - The force model comprehensive test system of soil body harmomegathus characteristic under a kind of consideration temperature gradient - Google Patents
The force model comprehensive test system of soil body harmomegathus characteristic under a kind of consideration temperature gradient Download PDFInfo
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- CN108572189A CN108572189A CN201810459086.2A CN201810459086A CN108572189A CN 108572189 A CN108572189 A CN 108572189A CN 201810459086 A CN201810459086 A CN 201810459086A CN 108572189 A CN108572189 A CN 108572189A
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- 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
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- 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
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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
- G01N3/18—Performing tests at high or low temperatures
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
Abstract
The present invention discloses a kind of force model comprehensive test system considering soil body harmomegathus characteristic under temperature gradient, and sharp freezing and heating freeze thawing to sample, the simulation in conjunction with practical realization to frozen swell and melt settlement phenomenon in Practical Project are realized by the temperature control torus of sample upper end；The variation of sample humidity is accurately controlled by the way of vapor, it is preferable to simulate drying shrinkage bulking phenomenon in Practical Project；And the Electronic Speculum for being freely rotatable, lifting is designed, comprehensive scanning is carried out to sample side, and the variation for observing internal structure caused by sample changes due to external environment, the change to analyze physico-mechanical properties is contributed to provide theories integration；Creative proposition silicon bi-layer oil ring design scheme improves test accuracy, to obtain Effective Swelling Pressure；Additionally by the laying optical fiber on sample side wall, realizes the accurate monitoring to temperature, and combine local train sensor on the outside of sample, realize the comprehensive monitoring integrally strained to sample；Utilitarian design value and promotional value of the present invention are high, are of great significance for indoor simulation swelled ground freeze thawing harmomegathus situation, monitoring indices variation.
Description
Technical field
The invention belongs to geotechnical engineering fields, more particularly to a kind of force model of soil body harmomegathus characteristic under consideration temperature gradient
Comprehensive test system is applied in the case of indoor simulation swelled ground freeze thawing-harmomegathus, monitoring indices variation.
Background technology
China is the widely distributed country of a swelled ground, and the expansion or shrinkage of swelled ground can be brought seriously to engineering construction
Harm.Meanwhile frozen soil region is widely distributed in China, frozen soil disease outstanding problem has seriously affected China's frozen soil
The builds to foundation engineering speed and regional development in area, the domestic research in terms of Frost heaving mechanism at present is still immature, does not look for also
To more rational model, it would be highly desirable to the support of experimental technique condition.
Application publication number is【CN106644750A】Patent of invention disclose a kind of three axis of open system Thawing soil sound and survey
Instrument is tried, unidirectional freezing-thawing test of sample etc. under different stress may be implemented when conventional frozen soil experiment, dynamic loading.But
Existing test apparatus is still short of in terms of test accuracy, application range and practicability, it would be highly desirable to propose that a kind of utilize is opened
Place system force model frost heave-expansion test system, it is special to carry out the dynamic response of the soil body and its power under various dynamic loadings
All kinds of engineerings such as the experimental study, including foundation engineering, dam, road engineering, ocean engineering, pipeline engineering of property and equipment it is steady
Qualitative, non-destructive tests and Gernral Check-up and soil-structural interaction experimental study and highway/railway engineering earthquake-resistant structure
Experimental study.To greatly promote key project construction ability, bigger contribution is made for the economic construction of country.
Invention content
Technical problem to be solved by the present invention lies in existing for the prior art in earthwork test Instrument design aspect
Existing defect proposes a kind of force model comprehensive test system considering soil body harmomegathus characteristic under temperature gradient, with accurate mould
Every mechanics index of physics situation of change of swelled ground under quasi- actual conditions, and observe soil body microscopical structure and change with external environment
Situation.
The present invention is realized using technical solution below：
The force model comprehensive test system of soil body harmomegathus characteristic under a kind of consideration temperature gradient, including steel framework, center
Transmission rod, loading system, temperature control system, moisture control system and master control system, central transmission rod are arranged on steel framework,
The loading system, temperature control system and moisture control system are connected with master control system；
The loading system includes static load loading device and dynamic load loading device, to be applied on central transmission rod
Add static load or dynamic load, the static load loading device includes clump weight, is applied by counterweight；Dynamic load loads
Device is applied using vibrator；The temperature control system includes water bath device, circulation line, temperature control torus and pellosil, described
Pellosil is wrapped on the outside of sample, and temperature control torus is located at the top of sample and is arranged around central transmission rod, and water bath device is logical
It crosses circulation line with temperature control torus to be connected, realizes and the temperature of sample is regulated and controled, simulate frozen swell and melt settlement phenomenon in Practical Project；
The moisture control system includes optical fiber, optical fibre interrogation instrument and ultrasonic wave steam generation facility, and the optical fiber is set
Set on pellosil inner wall, optical fiber is connected with optical fibre interrogation instrument, to detect sample humidity, be additionally provided on the outer wall of pellosil with
The connected cyclic annular local train sensor of master control system, can be combined with optical fiber, realize the comprehensive prison integrally strained to sample
It surveys；Steam lead is provided with below pellosil, steam lead is connected with ultrasonic wave steam generation facility, equal to sample to realize
Even humidification process is simulated by the variation of the content Control Assay humidity of vapor in control loop gas in Practical Project
Drying shrinkage bulking phenomenon；
The pellosil wraps around the first silicone oil ring cavity and the second silicone oil ring for being provided with and being connect with temperature control torus
Chamber, the second silicone oil ring cavity are located at the outside of the first silicone oil ring cavity, and are arranged one between the first silicone oil ring cavity and the second silicone oil ring cavity
Vacuum ring cavity, the vacuum ring intracavitary are provided with Electronic Speculum, realize the comprehensive scanning to sample side.Considerable test specimens are due to outer
Soil body microscopical structure variation caused by boundary's environment change, to deeply probe under different temperatures gradient and stress condition to the soil body
The mechanism that every physico-mechanical properties influence；By designing silicon bi-layer oil ring chamber, the second silicone oil ring cavity is not pressurized, and base pressure is only
Temperature controlled, sample lateral swelling force, the pressure change that the two difference can carry out temperature band are transmitted in the first silicone oil ring cavity side
It offsets, to obtain Effective Swelling Pressure.
Further, the bottom of the vacuum ring cavity is provided with a circular orbit, and the circular orbit surrounds sample circumference
Setting, the Electronic Speculum are arranged by a lifting gear on circular orbit, and are rotated along the circular orbit, pass through the rotation of Electronic Speculum
Turn and high high adjustment realize the scanning comprehensive to sample, convenient for observation sample due to environment changes and change that internal structure generates
Change, the change to analyze physico-mechanical properties provides theoretical foundation.
Further, the lifting gear includes an elevating lever and driving motor, the bottom of lifting gear be provided with
The matched pulley of circular orbit, the elevating lever use motor elevating lever, realize being freely lifted for Electronic Speculum, the driving motor with
Pulley is connected, and control lifting gear is moved along circular orbit.
Further, it is additionally provided with differential pressure pickup between the first silicone oil ring cavity and the second silicone oil ring cavity, with detection
The pressure difference of first silicone oil ring cavity and the second silicone oil ring cavity, can directly obtain lateral swelling force, and examination is found out by calculating accordingly
Sample lateral displacement size.
Further, it is provided with a locating plate on the central transmission rod, ranging biography is provided with above temperature control torus
Sensor realizes the real-time record to specimen height change, the distance measuring sensor by the cooperation of distance measuring sensor and locating plate
Using laser displacement sensor.
Further, the pilot system further includes a vacuum pump and the cloche that is arranged on steel framework, described
Vacuum pump makes to form vacuum inside cloche when experiment, reduces temperature and transmits, improves refrigeration and heating efficiency.
Compared with prior art, the advantages and positive effects of the present invention are：
Body frost heaving proposed by the invention-expansion opens pilot system, and structure design is simple, novel：
(1) by designing temperature control system, the sharp freezing and heating to sample are realized by the temperature control torus of sample upper end
Freeze thawing, in conjunction with the practical simulation realized to frozen swell and melt settlement phenomenon in Practical Project；
(2) by designing moisture control system, the variation of sample humidity is accurately controlled by way of vapor,
Drying shrinkage bulking phenomenon in preferable simulation Practical Project；
(3) by designing the Electronic Speculum for being freely rotatable, lifting, comprehensive scanning, considerable test are carried out to sample side
The variation of internal structure caused by sample changes due to external environment, the change to analyze physico-mechanical properties provide theoretical branch
It holds；
(4) silicon bi-layer oil ring chamber is designed, outer layer silicone oil ring cavity is not pressurized, and base pressure is only temperature controlled, inside silicone oil
Ring cavity transmits sample lateral expansion pressure, and the pressure change that the two difference can carry out temperature band is offset, effectively swollen to obtain
Expansive force；
(5) it by the laying optical fiber on sample side wall, realizes the accurate monitoring to temperature, and part on the outside of sample is combined to answer
Become sensor, realizes the comprehensive monitoring integrally strained to sample；
(6) it since testing equipment needs analog temperature to change, designs tempered glass cover in outermost and coordinates vacuum pump, make examination
Vacuum is formed when testing inside cloche, temperature is reduced and transmits, improve refrigeration and heating efficiency.
Description of the drawings
Fig. 1 is the overall structure diagram that body frost heaving-expansion opens pilot system described in the embodiment of the present invention；
1, vacuum pump；2, master control system control panel；3, vacuum exhaust pipe；4, locating plate；5, central transmission rod；6, glass
Cover；7, distance measuring sensor；8, circulation line water inlet pipe；9, pellosil；10, local train sensor；11, the second silicone oil ring cavity；
12, circulation line outlet pipe；13, Electronic Speculum；14, optical fiber；15, pedestal；16, optical fibre interrogation instrument；17, differential pressure pickup；18, water-bath
Device；19, power supply；20, ultrasonic wave steam generation facility；21, the first silicone oil ring cavity；22, temperature control torus；23, steam lead.
Specific implementation mode
In order to which the above objects, features and advantages of the present invention is more clearly understood, below in conjunction with the accompanying drawings and implement
The present invention will be further described for example.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still,
The present invention can also be implemented using different from other modes described here, and therefore, the present invention is not limited to following public
Specific embodiment.
The force model comprehensive test system of soil body harmomegathus characteristic under a kind of consideration temperature gradient, as shown in Figure 1, including steel
Frame, central transmission rod 5, loading system, temperature control system, moisture control system and master control system, the bottom of steel framework are set
It is equipped with pedestal 15, central transmission rod 5 is arranged on steel framework, the loading system, temperature control system and moisture control system
It is connected with master control system, specifically, the loading system includes static load loading device and dynamic load loading device (figure
In do not illustrate), to apply static load or dynamic load on central transmission rod 5, the static load loading device includes matching
Pouring weight is applied by counterweight；Dynamic load loading device is applied using vibrator；The temperature control system include water bath device 18,
Circulation line (circulation line water inlet pipe 8 and circulation line outlet pipe 12), temperature control torus 22 and pellosil 9, the pellosil 9
It for transparence, is wrapped on the outside of sample, temperature control torus 22 is located at the top of sample and is arranged around central transmission rod 5, water-bath
Device 18 is connected by circulation line with temperature control torus 22, is realized and is regulated and controled to the temperature of sample, simulates frost heave in Practical Project
Thaw collapse phenomenon；The moisture control system includes optical fiber 14, optical fibre interrogation instrument 16 and ultrasonic wave steam generation facility 20, described
Optical fiber 14 is arranged on 9 inner wall of pellosil (on sample lateral wall), and optical fiber 14 is connected with optical fibre interrogation instrument 16, wet to detect sample
It spends, the cyclic annular local train sensor 10 being connected with master control system is additionally provided on the outer wall of pellosil 9, it can be with 14 knot of optical fiber
It closes, realizes the comprehensive monitoring integrally strained to sample；The lower section of pellosil 9 is provided with steam lead 23, steam lead 23 with
Ultrasonic wave steam generation facility 20 is connected, and to realize to the uniform humidification process of sample, passes through vapor in control loop gas
Content Control Assay humidity variation, simulate Practical Project in drying shrinkage bulking phenomenon.
In the present embodiment, the pellosil 9 wraps around the first silicone oil ring cavity for being provided with and being connect with temperature control torus
21 and the second silicone oil ring cavity 11, the second silicone oil ring cavity 11 be located at the outside of the first silicone oil ring cavity 21, and 21 He of the first silicone oil ring cavity
One vacuum ring cavity is set between the second silicone oil ring cavity 11, and the vacuum ring intracavitary is provided with Electronic Speculum 13, realizes to sample side
Comprehensive scanning, soil body microscopical structure changes caused by being changed due to external environment by 13 considerable test specimens of Electronic Speculum, to
Deeply probe into the mechanism that different temperatures and stress condition influence soil body items physico-mechanical properties, the first silicone oil ring cavity 21 and the
It is additionally provided with differential pressure pickup 17 between two silicone oil ring cavities 11, to detect the pressure of the first silicone oil ring cavity 21 and the second silicone oil ring cavity 11
Difference can directly obtain lateral swelling force, and sample lateral displacement size is found out by calculating accordingly.And important is to create
Property proposition bilayer silicone oil design scheme, by designing silicon bi-layer oil ring chamber, the second silicone oil ring cavity is not pressurized, base pressure only by
Temperature controls, and sample lateral swelling force is transmitted in the first silicone oil ring cavity side, and the two difference can support the pressure change that temperature band is come
Disappear, to obtain Effective Swelling Pressure.
It continues to refer to figure 1, the bottom of the vacuum ring cavity is provided with a circular orbit, and the circular orbit surrounds circular sample
Week setting, the Electronic Speculum 13 are arranged by a lifting gear on circular orbit, and are rotated along the circular orbit, pass through Electronic Speculum
Rotation and high high adjustment realize the scanning comprehensive to sample, convenient for observation sample due to environment changes and internal structure generates
Variation, for analyze physico-mechanical properties change theoretical foundation is provided；In the present embodiment, the lifting gear includes a lifting
Bar and driving motor, the bottom of lifting gear is provided with uses motor liter with the matched pulley of circular orbit, the elevating lever
Bar drops to realize that being freely lifted for Electronic Speculum 13, the driving motor are connected with pulley, and control lifting gear is moved along circular orbit.
In addition, being provided with a locating plate 4 on the center transmission rod 5, the top of temperature control torus 22 is provided with ranging biography
Sensor 7 realizes the real-time record to specimen height change, the ranging sensing by the cooperation of distance measuring sensor 7 and locating plate 4
Device uses laser displacement sensor.It is transmitted to reduce temperature, it further includes one to improve refrigeration and heating efficiency, the pilot system
Vacuum pump 1 and the cloche 6 being arranged on steel framework, the vacuum pump 1 are connected by vacuum exhaust pipe 3 with cloche 6,
6 inside of cloche when experiment is set to form vacuum.
This experimental rig is mainly used for force model frost heave-expansion test under open system, native under truth for simulating
Every physical index of body changes, and can specifically carry out following tests：
(1) sample harmomegathus displacement monitoring：
The radius R that will have been configured1=50.0mm, high h1The cylindric sample of=200mm is placed in the cylinder of pellosil package
In space, instrument is assembled；Take initial volume V1=VInstrument-VSample, V is found out according to instrument explanation1Numerical value, from temperature control system into
Mouth is passed through coolant liquid, and constant temperature liquid stream carries out heat through temperature control torus, by silicone oil and transmits the cooling or heating realized to sample, together
When the temperature data Real-time Feedback that optical fiber measures can be realized that temperature is precisely controlled to water bath device by optical fibre interrogation instrument
System, 1-2min is stood after the temperature of sample reaches required temperature.
The optical fiber that sample side surface is distributed during drying and watering cycle can monitor the variation of the moisture content ρ of sample in real time, together
When the variation of sample moisture content is kept by moisture control system；Frost heave-expansion coupling process can repeatedly carry out to carry
For the sample after different number frost heave-expansion cycles；The static(al) and power that loading system is adjusted by master control system, make the load be
System is slowly slow to be declined, while recording numerical value change Δ h, the Δ p of displacement sensor and pressure sensor, and records atmospheric pressure P1；
The value, Δ P that differential pressure pickup is checked after system is stablized and stands 1-2min, P can be released by formula PV=nRT1V1=
P2V2, wherein (P2=P1+ Δ P), then there is formula
It can obtain：The lateral average displacement of sample can be found out by this formula.
(2) lateral local train：
It lateral is answered by what the local train sensor arranged on the outside of pellosil can measure at i-th point of vertical direction
Become Δ Ri(i-th point is volume position corresponding to local train sensor, is located at outside pellosil and is arranged at intervals with i office from top to bottom
Portion's strain transducer, i=1,2,3 ... ...), which can also make while providing data as local train for experiment
For the review data of lateral average displacement.
(3) soil sample inner structural features change：
Electronic Speculum can be started to be scanned sample, since Electronic Speculum is connect by retractable control-rod and bottom circular sliding rail
It touches, can realize 360 ° of rotations, comprehensive scanning is carried out to sample.
In short, this pilot system, by application Digital Control System, high-precision sensor technology, master control system uses
Total digital controller, have multiple Measurement channels, each Measurement channel can carry out respectively load, deformation etc. it is independent control or
Several Measurement channels jointly control.Vertical Static is applied using counterweight mode, vertical power is applied using vibrator；It can be into
Row：1. frost heave test, 2. thaw collapse test, 3. expansion test, 4. dry shrinkage testing, 5. expansion-frost heave coupling test, 6. thaw collapse-
Drying shrinkage coupling test realizes the detection to following parameter：1. vertical frost heave displacement (sample top), strain, soil pressure；2. vertical
Thaw collapse displacement (sample top)；3. vertical expansion displacement, strain, soil pressure, 4. vertical drying shrinkage displacement (sample top)；5. swollen
Vertical displacement, strain, soil pressure under swollen-frost heave coupling, 6. vertical displacement under thaw collapse-drying shrinkage coupling；7. frost heave,
Lateral deformation under the various effects such as thaw collapse, expansion, drying shrinkage, expansion-frost heave coupling, thaw collapse-dry shrinkage testing；8. test specimen consolidation
Displacement, local volume deformation, vertical deformation (strain and displacement), partially laterally deformation (strain and displacement)；9. internal void
Structure change situation；Utilitarian design of the present invention value and promotional value are high, for indoor simulation swelled ground freeze thawing-harmomegathus situation,
Monitoring indices variation is of great significance.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but it is every without departing from technical solution of the present invention content, according to the technical essence of the invention
To any simple modification, equivalent variations and remodeling made by above example, the protection domain of technical solution of the present invention is still fallen within.
Claims (6)
1. a kind of force model comprehensive test system considering soil body harmomegathus characteristic under temperature gradient, including steel framework, center pass
Power bar, loading system, temperature control system, moisture control system and master control system, central transmission rod are arranged on steel framework, institute
Loading system, temperature control system and moisture control system is stated to be connected with master control system, it is characterised in that：
The loading system includes static load loading device and dynamic load loading device, quiet to apply on central transmission rod
Power load or dynamic load；The temperature control system includes water bath device, circulation line, temperature control torus and pellosil, the silicon
Glued membrane is wrapped on the outside of sample, and temperature control torus is located at the top of sample and is arranged around central transmission rod, and water bath device passes through
Circulation line is connected with temperature control torus；
The moisture control system includes optical fiber, optical fibre interrogation instrument and ultrasonic wave steam generation facility, and the optical fiber setting exists
On pellosil inner wall, optical fiber is connected with optical fibre interrogation instrument, and the ring-type being connected with master control system is additionally provided on the outer wall of pellosil
Local train sensor；Steam lead is provided with below pellosil, steam lead is connected with ultrasonic wave steam generation facility, with
It realizes to the uniform humidification process of sample；
Wrapping around for the pellosil is provided with the first silicone oil ring cavity and the second silicone oil ring cavity, and the second silicone oil ring cavity is located at first
The outside of silicone oil ring cavity, and a vacuum ring cavity is set between the first silicone oil ring cavity and the second silicone oil ring cavity, the vacuum ring intracavitary
It is provided with Electronic Speculum, realizes the comprehensive scanning to sample side.
2. the force model comprehensive test system according to claim 1 for considering soil body harmomegathus characteristic under temperature gradient, special
Sign is：The bottom of the vacuum ring cavity is provided with a circular orbit, and the circular orbit is arranged around sample circumference, the electricity
Mirror is arranged by a lifting gear on circular orbit, and is rotated along the circular orbit.
3. the force model comprehensive test system according to claim 2 for considering soil body harmomegathus characteristic under temperature gradient, special
Sign is：The lifting gear includes an elevating lever and driving motor, and the bottom of lifting gear is provided with and circular orbit
The pulley matched, the elevating lever use motor elevating lever, the driving motor to be connected with pulley.
4. the force model comprehensive test system according to claim 3 for considering soil body harmomegathus characteristic under temperature gradient, special
Sign is：It is additionally provided with differential pressure pickup between the first silicone oil ring cavity and the second silicone oil ring cavity, to detect the first silicone oil ring
The pressure difference of chamber and the second silicone oil ring cavity.
5. the force model comprehensive test system according to claim 4 for considering soil body harmomegathus characteristic under temperature gradient, described
Be provided with a locating plate on central transmission rod, distance measuring sensor be provided with above temperature control torus, by distance measuring sensor with
The real-time monitoring to specimen height change is realized in the cooperation of locating plate.
6. the force model comprehensive test system according to claim 5 for considering soil body harmomegathus characteristic under temperature gradient, special
Sign is：It is characterized in that：The pilot system further includes a vacuum pump and the cloche that is arranged on steel framework, described
Vacuum pump is connected by vacuum exhaust pipe with cloche.
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| CN110568158A (en) * | 2019-09-30 | 2019-12-13 | 中国科学院寒区旱区环境与工程研究所 | Test device for testing stress and deformation of soil body in freezing and thawing process |
| CN112834559A (en) * | 2020-11-24 | 2021-05-25 | 安徽理工大学 | Rock freezing and thawing cycle experimental device capable of considering temperature gradient |
| CN112945708A (en) * | 2021-05-14 | 2021-06-11 | 中国科学院、水利部成都山地灾害与环境研究所 | Gravel frozen soil strength test system |
| CN113049628A (en) * | 2021-04-09 | 2021-06-29 | 中铁上海设计院集团有限公司 | Swelling soil wet swelling-frost heaving force combined tester |
| CN113686677A (en) * | 2021-08-20 | 2021-11-23 | 国际竹藤中心 | Real-time measurement device and method for internal stress of biomass material |
| CN115876608A (en) * | 2023-03-09 | 2023-03-31 | 成都理工大学 | Rock-soil mechanics test device and method in-situ freeze thawing-dry-wet cycle environment |
| CN110018296B (en) * | 2019-05-29 | 2024-04-26 | 河南理工大学 | Free expansion volume testing device and testing method in expansion rock hydration process |
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