CN106525596B - Lateral bedding counter-force coefficient indoor test device under different stress paths - Google Patents
Lateral bedding counter-force coefficient indoor test device under different stress paths Download PDFInfo
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- CN106525596B CN106525596B CN201610971020.2A CN201610971020A CN106525596B CN 106525596 B CN106525596 B CN 106525596B CN 201610971020 A CN201610971020 A CN 201610971020A CN 106525596 B CN106525596 B CN 106525596B
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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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- 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 lateral bedding counter-force coefficient indoor test devices under a kind of different stress paths, including test cabinet, loading device and flat dilatometer, the test cabinet is made of metal framework and poly (methyl methacrylate) plate, test cabinet single side face local openings are equipped with the cavity for allowing Loading Plate freely to promote, and top surface opening is equipped with two for fixing the support rod of jack reaction frame.The loading device provides power source for the different stress path load tests of the injection test of flat dilatometer and soil body top surface, side load plate, and load applies size and read by the pressure sensor being mounted on loading device.Apparatus of the present invention can be used for the lateral bedding counter-force coefficient of the soil body and its changing rule under synthesis measuring difference stress path, have the advantages that efficient, simple, fast.
Description
Technical field
The invention belongs to geotechnical engineering testing fields, 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 set.
Background technique
Lateral bedding counter-force coefficient is the important engineering parameter of piles under lateral load, foundation pit enclosure and tunnel support design,
It is influenced by factors.Current all kinds of engineering test method reliabilitys are lower, and in-situ test precision is relatively difficult to guarantee again.And laws for criterion
In the lateral bedding counter-force coefficient range variation of each soil layer for providing greatly, it is difficult to determine specific value in conjunction with practical soil layer condition.It passes
Lateral bedding counter-force coefficient of uniting generally is estimated by lateral loading test or carries out inverse, but both sides using horizontal static load test pile
Method takes a long time 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 a kind of lateral load-bearing test, small to the disturbance of the soil body, it is possible to provide continuous Physical And Mechanical Indexes of The Typical.
The working principle of flat dilatometer is after reaching test depth, to utilize air pressure in flat chisel probe injection soil using static(al) or power
The round steel membrane of flat chisel side is expanded outwardly to measure pressure and deformation relationship, and then solve using flat scoop bilge data reduction
Lateral bedding counter-force coefficient.This method have been relatively mature at present, and many effective computation models can use.
The lateral bedding counter-force coefficient of soil layer can not only be relatively accurately obtained using Flat Dilatometer Test, moreover it is possible to which approximation is even
Lateral bedding counter-force coefficient is obtained continuously with the variation relation of depth.Practical Project is relied on to carry out scene Flat Dilatometer Test in situ
Undoubtedly most direct, reliable method, but field test testing expense is expensive, influenced by site condition, construction environment it is serious,
And test detail is not easy to hold control.Therefore, it develops indoor test device and quickly measures the lateral bedding counter-force coefficient tool of the soil body
There are biggish practical value and economic value, and indoor test loading environment tests efficient quick convenient for control, cost is lower than again
Field test.But there is presently no the device of the lateral bedding counter-force coefficient of a set of indoor measurement soil body and standard test methods.Side
It is numerous to bedding counter-force index impacts factor, in addition to property (such as great soil group, groundwater condition, consolidation pressure early period with the soil body itself
Power and compactness etc.) have outside the Pass, it is also related with the factors such as loading stress path, loading speed.Under especially different stress paths
Lateral bedding counter-force coefficient determine be even more difficulties, pass through laboratory testing rig simulate the soil body different loading stress roads
Diameter, then testing the lateral bedding counter-force coefficient of the soil body is effective solution.
Summary 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
It is proposed that one kind can test lateral bedding counter-force coefficient indoor test device under different stress paths, to be conducive to study different shapes
The lateral bedding counter-force coefficient value of the state soil body and its changing rule.
Technical solution: in order to solve the above technical problems, lateral bedding counter-force system under difference stress path provided by the invention
Number indoor test device, including test cabinet, loading device and flat dilatometer, the loading device are passing through for flat dilatometer
The different stress path load tests for entering test and soil body top surface, side load plate provide power source.
Specifically, the square that the test cabinet is made of metal framework and poly (methyl methacrylate) plate, organic glass installation
On the side and bottom surface of cabinet, there is opening on the organic glass of a side.The side and bottom surface of the i.e. described test cabinet
It is closed by poly (methyl methacrylate) plate, top surface opening, one of side is endless totally-enclosed.
Specifically, the opening is equipped with side load mechanism, and the side load mechanism includes sequentially connected load
Lotus plate, propulsion arm, jack, reaction beam and reaction frame, the reaction frame are fixedly connected on test cabinet.In test cabinet
The cavity for allowing Loading Plate freely to promote locally is offered on side.
Specifically, the load plate is by propulsion arm power transmission, horizontally advanced under the Load-unload of hydraulic jack or after
It moves back；The propulsion arm is placed in slideway, and propulsion arm, slideway, hydraulic jack three's central axis are located in same horizontal line；
The pressure sensor for testing hydraulic jack loading level, the pushing tow are equipped between the propulsion arm and hydraulic jack
Bar side face is also equipped with displacement reading device.
Specifically, the top surface of the test cabinet is equipped with lateral support rod, is equipped with top surface load on the support rod
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 of the top surface control feel simulator connects pressure sensor and load plate, has in the load plate
There is the preformed hole for passing through flat dilatometer.
Specifically, the load plate and soil body contact surface are equipped with the flexible rubber pad with load plate homalographic.For eliminating
The stress concentration phenomenon that load plate is generated in soil body surface.
The specific implementation process of lateral bedding counter-force coefficient indoor test device is as follows under above-mentioned difference stress path:
S1. device is assembled by test request, the working condition of hydraulic jack and reaction frame, reaction beam is examined to consolidate
Pledge love condition, and can propulsion arm be freely moved horizontally in slideway and is checked.Soil to be determined is packed into 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. in the top surface soil body, side soil body difference installed load plate and rubber pad, load plate, rubber pad are to be arranged in soil
Body surface face central location is advisable, and load plate, rubber pad, soil layer surface three must strictly be affixed；
S3., pressure sensor, offset table are installed, and the initial value of pressure sensor, offset table is corrected.It installs flat
The swollen instrument in side is shoveled, and guarantees that it can be along load plate injection vertical with the preformed hole of rubber pad；
S4. hydraulic jack is started to work, and is loaded by different stress paths to the soil body, corresponding to carry out flat scoop bilge examination
It tests.Flat dilatometer hydraulic jack effect under the injection soil body, after reaching predetermined depth, measure steel membrane expansion status under by
Power deformation relationship；
S5. terminate to test, hydraulic jack is unloaded, be slowly lifted out flat dilatometer, clean recovery test equipment；
S6. data preparation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, according to the actual measurement of each testing site
Δ p value acquires lateral bedding counter-force coefficient calculated value K as the following formulah0:
In formula, s (0) is the displacement of steel membrane central point, is 1.10mm；Δ p is the increasing of corresponding steel membrane side soil pressure
Amount.
S7. abovementioned steps are repeated, analyze and conclude the value range of the lateral bedding counter-force coefficient of different soil and its with depth
The changing rule of degree provides reference for design early period of piles under lateral load, base pit engineering and Tunnel Engineering.
The utility model has the advantages that lateral bedding counter-force coefficient indoor test device under different stress paths of the invention, solves length
Lateral bedding counter-force coefficient difficulty existing for phase measures problem.The device can be lateral with the soil body under synthesis measuring difference stress path
Bedding counter-force coefficient value and its changing rule, and apparatus structure is simple, operates easily controllable, efficient quick.
The technical issues of in addition to invention described above solution, constitutes the technical characteristic of technical solution and by these skills
Outside advantage brought by the technical characteristic of art scheme, lateral bedding counter-force coefficient indoor test under different stress paths of the invention
The other technical characteristics and these technical characteristic brings for including in other technologies problem that device can solve, technical solution
Advantage will be described in more detail in conjunction with attached drawing.
Detailed description of the invention
Fig. 1 is the overall schematic of the device of the embodiment of the present invention；
Fig. 2 is A-A diagrammatic cross-section；
Fig. 3 is B-B diagrammatic cross-section；
In figure: 1- metal framework, 2- poly (methyl methacrylate) plate, 3- hydraulic jack, 4- propulsion arm, 5- slideway, 6- reaction beam, 7-
Reaction frame, 8- bolt, 9- pressure sensor, 10- offset table, 11- metal welding block, 12- load plate, 13- rubber pad, 14- are hydraulic
Jack, 15- reaction frame, 16- reaction beam, 17- bolt, 18- support rod, 19- pressure sensor, 20- load plate, 21- rubber
Pad, 22- flat dilatometer, 23- steel membrane, 24- hydraulic jack, 25- reaction frame, 26- reaction beam, 27- bolt, 28- preformed hole.
Specific embodiment
Embodiment:
Referring to attached drawing 1- Fig. 3, lateral bedding counter-force coefficient indoor test device, packet under the different stress paths of the present embodiment
Include test cabinet, loading device and flat dilatometer.The test cabinet is made of metal framework 1 and poly (methyl methacrylate) plate 2, test
Cabinet is the cube structure that length is 500mm.Test body side and bottom surface are closed by poly (methyl methacrylate) plate 2, top surface
Opening.The one side and top surface of testing cabinet are separately provided for the hydraulic jack 3,14,24 of test load, it is specific and
The top surface of speech, the test cabinet is equipped with 2 hydraulic jacks 14,24, and side is equipped with 1 hydraulic jack 3.The test box
The one side local openings of body are equipped with the cavity for allowing Loading Plate 12 freely to promote, and load plate 12 is by 4 power transmission of propulsion arm, in liquid
Press horizontal under the Load-unload of jack 3 move forward or back.The propulsion arm 4 is placed in slideway 5, propulsion arm 4, slideway 5, liquid
Pressure 3 three's central axis of jack is located in same horizontal line.One pressure is set between the propulsion arm 4 and hydraulic jack 3
Force snesor 9 is used to test the loading level of hydraulic jack 3.4 side of propulsion arm also extension is provided with a metal welding block
11, the metal welding block 11 is fixed with the complete spot welding of propulsion arm 4, the two move horizontally displacement it is completely the same, move horizontally position
Shifting is read by the offset table 10 being fixed on slideway 5.
Test box top is equipped with two for fixing the support rod 18 of jack reaction frame 15,25, the reaction frame 7 of side
It is then directly anchored on the metal framework 1 of the test cabinet.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 soil body top surface load plate 20, the different stress path load tests of side load plate 12 provide power source.To disappear
Except the stress concentration phenomenon that load plate 12,20 is generated in soil body surface, the load plate 12,20 is respectively equipped with soil body contact surface
With the flexible rubber pad 13,21 of load plate 12,20 homalographics.The flat dilatometer 22 injection under the load of hydraulic jack 24
Testing experiment is carried out in soil, the top surface load plate 20 is reserved equipped with allowing flat dilatometer 22 to pass perpendicularly through with rubber pad 21
Hole 28.
The specific implementation process of lateral bedding counter-force coefficient indoor test device is as follows under above-mentioned difference stress path:
S1. device is assembled by test request, the working condition and reaction frame 7 of inspection hydraulic jack 3,14,24,
15, the 25, fixing situation of reaction beam 6,16,26, and propulsion arm 4 can be moved horizontally freely in slideway 5 and checked.It is past
The soil body to be determined is packed into test box body, the soil body to be determined must be well prepared in advance by conditions such as soil classification, moisture content；
S2. in the side soil body, top surface soil body difference installed load plate 12,20 and rubber pad 13,21, load plate 12,20 and
Rubber pad 13,21 is advisable with being arranged in soil body surface central location, and load plate, rubber pad, soil layer surface three must strictly be affixed；
S3., pressure sensor 9, offset table 10 are installed, and the initial value of pressure sensor 9, offset table 10 is corrected.
Flat dilatometer 22 is installed, and guarantees that it can be along the injection vertical with the preformed hole 28 of rubber pad 21 of load plate 20；
S4. hydraulic jack 3,14,24 is started to work, and is loaded by different stress paths to the soil body, and corresponding development is flat
Shovel the swollen test in side.The injection soil body under the effect of hydraulic jack 24 of flat dilatometer 22, after reaching predetermined depth, measures steel membrane 23
Stress deformation relationship under expansion status；
S5. terminate to test, hydraulic jack 3,14,24 is unloaded, be slowly lifted out flat dilatometer 22, cleaning recycling examination
Test equipment；
S6. data preparation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, according to the actual measurement of each testing site
Δ p value acquires lateral bedding counter-force coefficient calculated value K as the following formulah0:
In formula, s (0) is the displacement of 23 central point of steel membrane, is 1.10mm；Δ p is corresponding 23 side soil pressure of steel membrane
Power increment.
S7. abovementioned steps are repeated, analyze and conclude the value range of the lateral bedding counter-force coefficient of different soil and its with depth
The changing rule of degree provides reference for design early period of piles under lateral load, base pit engineering and Tunnel Engineering.
Embodiments of the present invention are described in detail in conjunction with attached drawing above, but the present invention is not limited to described reality
Apply mode.For those of ordinary skill in the art, in the range of the principle of the present invention and technical idea, to these implementations
Mode carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (2)
1. lateral bedding counter-force coefficient indoor test device under a kind of difference stress path, including test cabinet, loading device and
Flat dilatometer, it is characterised in that: the loading device is injection test and the soil body top surface, side load plate of flat dilatometer
Different stress path load tests power source is provided, the top surface of the test cabinet is equipped with lateral support rod, the support rod
On top surface control feel simulator and flat dilatometer injection mechanism, the top surface control feel simulator and flat dilatometer injection mechanism are installed
It include reaction frame, reaction beam and jack；The jack connection pressure sensor and load plate of the top surface control feel simulator, institute
Stating in load plate has for the preformed hole across flat dilatometer, and the load plate and soil body contact surface are equipped with load plate etc.
The flexible rubber pad of area；
The square that the test cabinet is made of metal framework and poly (methyl methacrylate) plate, organic glass are mounted on the side of cabinet
On bottom surface, there is opening on the organic glass of a side；The opening is equipped with side load mechanism, and the side carries
Lotus mechanism includes sequentially connected load plate, propulsion arm, jack, reaction beam and reaction frame, and the reaction frame is fixedly connected on
It tests on cabinet；The load plate is horizontal under the Load-unload of hydraulic jack to move forward or back by propulsion arm power transmission；Institute
It states propulsion arm to be placed in slideway, propulsion arm, slideway, hydraulic jack three's central axis are located in same horizontal line；It is described
The pressure sensor for testing hydraulic jack loading level, the pushing tow bar side are equipped between propulsion arm and hydraulic jack
Face is also equipped with displacement reading device.
2. the test side of lateral bedding counter-force coefficient indoor test device under difference stress path according to claim 1
Method, it is characterised in that the following steps are included:
Step 1, test device is assembled by test request, the working condition of hydraulic jack and reaction frame, reaction beam is examined to consolidate
Pledge love condition, and can propulsion arm be freely moved horizontally in slideway and is checked, be packed into test box body by soil classification,
The previously prepared soil body to be determined of moisture content；
Step 2, soil body table is arranged in the top surface soil body, side soil body difference installed load plate and rubber pad, load plate, rubber pad
Face central location, and load plate, rubber pad, soil layer surface three are mutually close to；
Step 3, pressure sensor, offset table are installed, and the initial value of pressure sensor, offset table is corrected；It installs flat
The swollen instrument in side is shoveled, and guarantees that it can be along load plate injection vertical with the preformed hole of rubber pad；
Step 4, hydraulic jack is started to work, and is loaded by different stress paths to the soil body, corresponding to carry out flat scoop bilge examination
It tests；Flat dilatometer hydraulic jack effect under the injection soil body, after reaching predetermined depth, measure steel membrane expansion status under by
Power deformation relationship；
Step 5. terminates test, and hydraulic jack is unloaded, and is slowly lifted out flat dilatometer, cleans recovery test equipment；
Step 6. data preparation, when solving lateral bedding counter-force coefficient using Flat Dilatometer Test, according to the actual measurement of each testing site
Δ p value acquires lateral bedding counter-force coefficient calculated value K as the following formulah0:
In formula, s (0) is the displacement of steel membrane central point, is 1.10mm；Δ p is corresponding steel membrane side soil pressure increment；
Step 7, step 1~6 are repeated, analyze and conclude the value range of the lateral bedding counter-force coefficient of different soil and its with depth
Changing rule, for piles under lateral load, base pit engineering and Tunnel Engineering early period design reference is provided.
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| CN110631991B (en) * | 2019-10-11 | 2024-06-04 | 南京林业大学 | Testing device for forming high-strength mud cake by wedging type loading and adhesion measuring method |
| CN111141607B (en) * | 2020-01-13 | 2023-05-23 | 北京工业大学 | Pile-soil test is with many loading route unidirectional shear boxes of self-balancing |
| 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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