CN106525596A - Indoor testing device for reaction coefficients of lateral foundation bed under different stress paths - Google Patents
Indoor testing device for reaction coefficients of lateral foundation bed under different stress paths Download PDFInfo
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- CN106525596A CN106525596A CN201610971020.2A CN201610971020A CN106525596A CN 106525596 A CN106525596 A CN 106525596A CN 201610971020 A CN201610971020 A CN 201610971020A CN 106525596 A CN106525596 A CN 106525596A
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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
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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
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an indoor testing device for reaction coefficients of a lateral foundation bed under different stress paths. The indoor testing device comprises a testing box, a loading device and a flat dilatometer, wherein the testing box consists of a metal frame and an organic glass plate; an opening is locally formed in a single side surface of the testing box to obtain a cavity which allows a load plate to be pushed in freely; an opening is formed in the top surface of the testing box and two supporting rods for fixing a jack reaction frame are arranged in the opening of the top surface. The loading device provides a force source for the penetration test of the flat dilatometer and different stress path loading tests of load plates on the top surface and the side surfaces of a soil body, and the magnitude of the applied load is read by a pressure sensor mounted on the loading device. The device can be used for comprehensively measuring the reaction coefficients of the lateral foundation bed of the soil body under the different stress paths and the change rule of the reaction coefficients, and has the advantages of high efficiency, simplicity and convenience, and speediness.
Description
Technical field
The invention belongs to Geotechnical Engineering field tests, are related to the soil of piles under lateral load, foundation pit enclosure and tunnel support design
Side determines problem to bedding counter-force coefficient, specifically surveys in lateral bedding counter-force coefficient room under a kind of different stress paths
Trial assembly is put.
Background technology
Lateral bedding counter-force coefficient is the important engineering parameter of piles under lateral load, foundation pit enclosure and tunnel support design, its
Affected by factors.All kinds of engineering test method reliabilitys are relatively low at present, and in-situ test precision is relatively difficult to ensure card again.And laws for criterion
In the lateral bedding counter-force coefficient range of each soil layer for being given change greatly, it is difficult to determine concrete numerical value with reference to actual soil layer condition.Pass
Lateral bedding counter-force coefficient of uniting is estimated typically by lateral loading test or carries out inverse, but both sides using horizontal static load test pile
Method is time-consuming longer and costly.Thus, how to effectively obtain the difficulty that lateral bedding counter-force coefficient is always Geotechnical Engineering circle
One of topic.
Flat Dilatometer Test is that a kind of lateral load-bearing is tested, and its disturbance to the soil body is little, it is possible to provide continuous Physical And Mechanical Indexes of The Typical.
The operation principle of flat dilatometer is in flat chisel probe injection soil, up to after MTD, using air pressure using static(al) or power
The circular steel membrane of flat chisel side is expanded outwardly to measure pressure and deformation relationship, and then solved using Dmt data reduction
Lateral bedding counter-force coefficient.The method is more ripe at present, and many effective computation models can be adopted.
The lateral bedding counter-force coefficient of soil layer can not only relatively accurately be obtained using Flat Dilatometer Test, moreover it is possible to approximately connect
Variation relation of the lateral bedding counter-force coefficient with depth is obtained continuously.Practical Project is relied on to carry out scene original position Flat Dilatometer Test
Undoubtedly most direct, reliable method, but field test testing expense is expensive, is affected seriously by site condition, construction environment,
And test detail is not easy to hold control.Therefore, develop indoor test device and quickly determine the lateral bedding counter-force coefficient tool of the soil body
There are larger practical value and economic worth, and indoor test loading environment is easy to control, test efficient quick, cost is less than again
Field test.But there is presently no device and the standard test method of the lateral bedding counter-force coefficient of a set of indoor measurement soil body.Side
It is numerous to bedding counter-force index impacts factor, except (pressing as great soil group, groundwater condition, early stage are consolidated with the property of the soil body itself
Power and degree of compaction etc.) have outside the Pass, it is also relevant with the factor such as loading stress path, loading speed.Under particularly different stress paths
Lateral bedding counter-force coefficient determine and be even more difficulties, the different loading stress roads of the soil body are simulated by laboratory testing rig
Footpath, it is effective solution to test then the lateral bedding counter-force coefficient of the soil body.
The content of the invention
Goal of the invention：In order to overcome the shortcomings of that the lateral bedding counter-force coefficient of the existing soil body determines method and defect, the present invention
Propose that one kind can test lateral bedding counter-force coefficient indoor test device under different stress paths, so as to be beneficial to study different shapes
The lateral bedding counter-force coefficient value of the state soil body and its Changing Pattern.
Technical scheme：For solving above-mentioned technical problem, lateral bedding counter-force system under the different stress paths that the present invention is provided
Number indoor test device, including test casing, charger and flat dilatometer, the charger is passed through for flat dilatometer
Enter test and soil body top surface, the different stress path load tests of side load plate provide power source.
Specifically, the square that the test casing is made up of metal framework and poly (methyl methacrylate) plate, lucite are installed
On the side and bottom surface of casing, there is on the lucite of a side opening.The side and bottom surface of i.e. described test casing
Closed by poly (methyl methacrylate) plate, top surface opening, one of side are not exclusively closed.
Specifically, side load mechanism is installed at the opening, the side load mechanism includes the load being sequentially connected
Lotus plate, propulsion arm, jack, reaction beam and reaction frame, the reaction frame are fixedly connected on test casing.In test casing
The cavity that allow Loading Plate freely advance is offered on side locally.
Specifically, the load plate is by propulsion arm power transmission, horizontally advance under the Load-unload of hydraulic jack or after
Move back；The propulsion arm is placed in slideway, and propulsion arm, slideway, hydraulic jack three central axis are located in same horizontal line；
The pressure transducer for testing hydraulic jack loading level, the pushing tow is provided between the propulsion arm and hydraulic jack
Bar side face is also equipped with displacement reading device.
Specifically, the top surface of the test casing is provided with horizontal support bar, is provided with top surface load on the support bar
Mechanism and flat dilatometer injection mechanism, the top surface control feel simulator and flat dilatometer injection mechanism include reaction frame, anti-
Power beam and jack.
Specifically, the jack connection pressure transducer of the top surface control feel simulator and load plate, have in the load plate
Have for the preformed hole through flat dilatometer.
Specifically, the load plate is provided with the flexible rubber pad with load plate homalographic with soil body contact surface.For eliminating
The stress concentration phenomenon that load plate is produced in soil body surface.
Under above-mentioned different stress paths, the specific implementation process of lateral bedding counter-force coefficient indoor test device is as follows：
S1. device is assembled by test request, the working condition and reaction frame, reaction beam for checking hydraulic jack is consolidated
Pledge love condition, and can Free water translation is dynamic checks in the slideway to propulsion arm.Load soil to be determined toward in test box body
Body, the soil body to be determined must be well prepared in advance by conditions such as soil classification, moisture content；
S2. load plate and rubber blanket is respectively mounted in the top surface soil body, the side soil body, load plate, rubber blanket are being arranged in soil
Body surface face middle position is advisable, and load plate, rubber blanket, soil layer surface three strictly must be affixed；
S3., pressure transducer, offset table are installed, and the initial value to pressure transducer, offset table is corrected.Install flat
The swollen instrument in side is shoveled, and ensures which can be along load plate injection vertical with the preformed hole of rubber blanket；
S4. hydraulic jack is started working, and the soil body is loaded by different stress paths, and correspondence carries out Dmt examination
Test.Flat dilatometer injection soil body under hydraulic jack effect, after reaching desired depth, determines receiving under steel membrane expansion status
Force deformation relation；
S5. terminate test, hydraulic jack is unloaded, be slowly lifted out flat dilatometer, clean recovery test equipment；
S6. data compilation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, surveys according to each testing site
Δ p value, tries to achieve lateral bedding counter-force coefficient value of calculation K as the following formulah0：
In formula, displacements of the s (0) for steel membrane central point, is 1.10mm；Δ p is that corresponding steel membrane side soil pressure increases
Amount.
S7. repeat the span of abovementioned steps, analysis and the lateral bedding counter-force coefficient of conclusion different soil and its with depth
The Changing Pattern of degree, the early stage design for piles under lateral load, base pit engineering and Tunnel Engineering provide reference.
Beneficial effect：Under the different stress paths of the present invention, lateral bedding counter-force coefficient indoor test device, solves length
The lateral bedding counter-force coefficient hardly possible measure problem that phase is present.The device can be lateral with the soil body under synthesis measuring difference stress path
Bedding counter-force coefficient value and its Changing Pattern, and apparatus structure is simple, operate easily controllable, efficient quick.
Except invention described above solve technical problem, constitute technical scheme technical characteristic and by these skills
Outside the advantage brought by the technical characteristic of art scheme, lateral bedding counter-force coefficient indoor test under the different stress paths of the present invention
What the other technical characteristics and these technical characteristics included in other technologies problem that device can be solved, technical scheme were brought
Advantage, will combine accompanying drawing and be described in more detail.
Description of the drawings
Overall schematics of the Fig. 1 for the device of the embodiment of the present invention；
Fig. 2 is A-A generalized sections；
Fig. 3 is B-B generalized sections；
In figure：1- metal frameworks, 2- poly (methyl methacrylate) plates, 3- hydraulic jacks, 4- propulsion arms, 5- slideways, 6- reaction beams, 7-
Reaction frame, 8- bolts, 9- pressure transducers, 10- offset tables, 11- metal welding blocks, 12- load plates, 13- rubber blankets, 14- hydraulic pressure
Jack, 15- reaction frames, 16- reaction beams, 17- bolts, 18- support bars, 19- pressure transducers, 20- load plates, 21- rubber
Pad, 22- flat dilatometers, 23- steel membranes, 24- hydraulic jacks, 25- reaction frames, 26- reaction beams, 27- bolts, 28- preformed holes.
Specific embodiment
Embodiment：
Referring to accompanying drawing 1- Fig. 3, lateral bedding counter-force coefficient indoor test device under the different stress paths of the present embodiment, bag
Include test casing, charger and flat dilatometer.The test casing is made up of metal framework 1 and poly (methyl methacrylate) plate 2, is tested
Casing is the cube structure of 500mm for length.Test body side and bottom surface are closed by poly (methyl methacrylate) plate 2, top surface
Opening.The one side and top surface of test casing is separately provided for testing the hydraulic jack 3,14,24 of loading, it is concrete and
Speech, the top surface of the test casing are provided with 2 hydraulic jacks 14,24, and side is provided with 1 hydraulic jack 3.The test box
The one side local openings of body are provided with the cavity for allowing Loading Plate 12 freely to advance, and load plate 12 passes through 4 power transmission of propulsion arm, in liquid
Horizontally advance or retreat under the Load-unload of pressure jack 3.The propulsion arm 4 is placed in slideway 5, propulsion arm 4, slideway 5, liquid
3 three's central axis of pressure jack is located in same horizontal line.One pressure is set between the propulsion arm 4 and hydraulic jack 3
Force transducer 9 is used for testing the loading level of hydraulic jack 3.4 side of the propulsion arm also extension is provided with a metal welding block
11, the metal welding block 11 is fixed with 4 complete spot welding of propulsion arm, the two to move horizontally displacement completely the same, move horizontally position
Shifting is read by the offset table 10 being fixed on slideway 5.
Test box top is provided with two support bars 18 for fixing jack reaction frame 15,25, the reaction frame 7 of side
Then it is directly anchored on the metal framework 1 of the test casing.Reaction beam 6,16,26 is fixed on instead by bolt 8,17,27 respectively
On power frame 7,15,25,3 hydraulic jacks 3,14,24 provide counter-force by reaction beam 6,16,26 respectively, are flat dilatometer 22
Injection test and the different stress path load tests of soil body top surface load plate 20, side load plate 12 power sources are provided.For disappearing
Except the stress concentration phenomenon that load plate 12,20 is produced in soil body surface, the load plate 12,20 is respectively equipped with soil body contact surface
With load plate 12, the flexible rubber pad 13,21 of 20 homalographics.The injection under the loading of hydraulic jack 24 of the flat dilatometer 22
Carry out testing experiment in soil, the top surface load plate 20 is provided with allow flat dilatometer 22 to pass perpendicularly through reserved with rubber blanket 21
Hole 28.
Under above-mentioned different stress paths, the specific implementation process of lateral bedding counter-force coefficient indoor test device is as follows：
S1. device is assembled by test request, check hydraulic jack 3,14,24 working condition and reaction frame 7,
15th, 25, the fixing situation of reaction beam 6,16,26, and can Free water translation is dynamic checks in the slideway 5 to propulsion arm 4.It is past
Load the soil body to be determined in test box body, the soil body to be determined must be well prepared in advance by conditions such as soil classification, moisture content；
S2. load plate 12,20 and rubber blanket 13,21, load plate 12,20 and are respectively mounted in the side soil body, the top surface soil body
Rubber blanket 13,21 is advisable with being arranged in soil body surface middle position, and load plate, rubber blanket, soil layer surface three strictly must be affixed；
S3., pressure transducer 9, offset table 10 are installed, and the initial value to pressure transducer 9, offset table 10 is corrected.
Flat dilatometer 22 is installed, and ensures which can be along the 28 vertical injection of preformed hole of load plate 20 and rubber blanket 21；
S4. hydraulic jack 3,14,24 is started working, and the soil body is loaded by different stress paths, and correspondence is carried out flat
Test that shovel side is swollen.The injection soil body under the effect of hydraulic jack 24 of flat dilatometer 22, after reaching desired depth, determines steel membrane 23
Stress deformation relation under expansion status；
S5. terminate test, hydraulic jack 3,14,24 is unloaded, be slowly lifted out flat dilatometer 22, cleaning reclaims examination
Test equipment；
S6. data compilation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, surveys according to each testing site
Δ p value, tries to achieve lateral bedding counter-force coefficient value of calculation K as the following formulah0：
In formula, displacements of the s (0) for 23 central point of steel membrane, is 1.10mm；Δ p is corresponding 23 side soil pressure of steel membrane
Power increment.
S7. repeat the span of abovementioned steps, analysis and the lateral bedding counter-force coefficient of conclusion different soil and its with depth
The Changing Pattern of degree, the early stage design for piles under lateral load, base pit engineering and Tunnel Engineering provide reference.
Embodiments of the present invention are described in detail above in association with accompanying drawing, but the present invention is not limited to described reality
Apply mode.For one of ordinary skill in the art, in the range of the principle of the present invention and technological thought, to these enforcements
Mode carries out various changes, modification, replacement and deformation and still falls within protection scope of the present invention.
Claims (8)
1. lateral bedding counter-force coefficient indoor test device under a kind of different stress paths, including test casing, charger and
Flat dilatometer, it is characterised in that：Injection test and soil body top surface, side load plate of the charger for flat dilatometer
Different stress path load tests power sources are provided.
2. lateral bedding counter-force coefficient indoor test device under different stress paths according to claim 1, its feature exist
In：The square that the test casing is made up of metal framework and poly (methyl methacrylate) plate, lucite are arranged on the side of casing
On bottom surface, there is on the lucite of a side opening.
3. lateral bedding counter-force coefficient indoor test device under different stress paths according to claim 2, its feature exist
In：Side load mechanism is installed at the opening, load plate that the side load mechanism includes being sequentially connected, propulsion arm,
Jack, reaction beam and reaction frame, the reaction frame are fixedly connected on test casing.
4. lateral bedding counter-force coefficient indoor test device under different stress paths according to claim 3, its feature exist
In：The load plate under the Load-unload of hydraulic jack is horizontally advanced or is retreated by propulsion arm power transmission；The propulsion arm
It is placed in slideway, propulsion arm, slideway, hydraulic jack three central axis are located in same horizontal line；The propulsion arm with
The pressure transducer for testing hydraulic jack loading level is provided between hydraulic jack, and the propulsion arm side is also installed
There is displacement reading device.
5. lateral bedding counter-force coefficient indoor test device under different stress paths according to claim 1, its feature exist
In：The top surface of the test casing is provided with horizontal support bar, is provided with top surface control feel simulator and flat chisel side on the support bar
Zhang Yi injection mechanism, the top surface control feel simulator and flat dilatometer injection mechanism include reaction frame, reaction beam and jack.
6. lateral bedding counter-force coefficient indoor test device under different stress paths according to claim 5, its feature exist
In：The jack connection pressure transducer and load plate of the top surface control feel simulator, with for through flat in the load plate
Shovel the preformed hole of the swollen instrument in side.
7. lateral bedding counter-force coefficient indoor test device, its feature under the different stress paths according to claim 4 or 6
It is：The load plate is provided with the flexible rubber pad with load plate homalographic with soil body contact surface.
8. under different stress paths according to claim 1 lateral bedding counter-force coefficient indoor test device test side
Method, it is characterised in that comprise the following steps：
Step 1, assembles test device by test request, and the working condition and reaction frame, reaction beam for checking hydraulic jack is consolidated
Pledge love condition, and to propulsion arm in the slideway can Free water translation is dynamic checks, load toward in test box body press soil classification,
The previously prepared soil body to be determined of the conditions such as moisture content；
Step 2, is respectively mounted load plate and rubber blanket in the top surface soil body, the side soil body, and load plate, rubber blanket are arranged in soil body table
Face middle position, and load plate, rubber blanket, soil layer surface three are mutually close to；
Step 3, installs pressure transducer, offset table, and the initial value to pressure transducer, offset table is corrected；Install flat
The swollen instrument in side is shoveled, and ensures which can be along load plate injection vertical with the preformed hole of rubber blanket；
Step 4, hydraulic jack are started working, and the soil body are loaded by different stress paths, and correspondence carries out Dmt examination
Test；Flat dilatometer injection soil body under hydraulic jack effect, after reaching desired depth, determines receiving under steel membrane expansion status
Force deformation relation；
S5. terminate test, hydraulic jack is unloaded, be slowly lifted out flat dilatometer, clean recovery test equipment；
S6. data compilation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, according to the Δ p of each testing site actual measurement
Value, tries to achieve lateral bedding counter-force coefficient value of calculation K as the following formulah0：
In formula, displacements of the s (0) for steel membrane central point, is 1.10mm；Δ p is corresponding steel membrane side soil pressure increment；
The span of the lateral bedding counter-force coefficient of different soil is analyzed and concluded to step 7, repeat step 1～6 and its with depth
Changing Pattern, for piles under lateral load, base pit engineering and Tunnel Engineering early stage design reference is provided.
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| CN110567429A (en) * | 2019-09-25 | 2019-12-13 | 辽宁工程技术大学 | Device and method for measuring actual Poisson ratio of foundation soil body under lateral limit stress condition |
| CN110631991A (en) * | 2019-10-11 | 2019-12-31 | 南京林业大学 | Test device for forming high-strength mud cake through wedging loading and adhesion force measuring method |
| CN111141607A (en) * | 2020-01-13 | 2020-05-12 | 北京工业大学 | Self-balancing multi-loading-path unidirectional shearing box for pile-soil test |
| CN114062646A (en) * | 2021-09-26 | 2022-02-18 | 广东省路桥建设发展有限公司 | Testing device and testing method for lateral geological exploration in drill hole |
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| CN111141607A (en) * | 2020-01-13 | 2020-05-12 | 北京工业大学 | Self-balancing multi-loading-path unidirectional shearing box for pile-soil test |
| CN114062646A (en) * | 2021-09-26 | 2022-02-18 | 广东省路桥建设发展有限公司 | Testing device and testing method for lateral geological exploration in drill hole |
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| Publication number | Publication date |
|---|---|
| CN106525596B (en) | 2019-06-21 |
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