CN106836318A - Study the combined type proportional loading experimental rig and method of pile-soil interaction - Google Patents
Study the combined type proportional loading experimental rig and method of pile-soil interaction Download PDFInfo
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- CN106836318A CN106836318A CN201710112845.3A CN201710112845A CN106836318A CN 106836318 A CN106836318 A CN 106836318A CN 201710112845 A CN201710112845 A CN 201710112845A CN 106836318 A CN106836318 A CN 106836318A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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 a kind of combined type proportional loading experimental rig and method for studying pile-soil interaction, it solves the problems, such as that pile foundation test device cannot simulate the pile-soil interaction rule under different stresses, of the invention vertical and lateral loading device can be combined and use, the vertical and lateral complicated applied force state of stake in easily can simulating Practical Project in process of the test.Can be used to study the pile-soil interaction characteristic research of pile foundation, determine influence each other distance and pile peripheral earth coverage of the stake under the restrained condition of piles with different bottom in piles with different under.Based on test data, promoted for the theoretical research of stake and engineer applied and experiment basic parameter is provided.Its technical scheme is：Including vertical loading device and horizontal loading device, the vertical loading device is connected with cushion cap top surface, and the horizontal loading device is connected with cushion cap side；The cushion cap bottom treats that peg is connected with multiple, described to treat that peg periphery is filled out and set the soil body.
Description
Technical field
The invention belongs to field of civil engineering, and in particular to a kind of combined type proportional loading of research interaction between pile and soil
Experimental rig and method.
Background technology
With the fast development of economic construction, many large-scale public infrastructures such as bridge, building, high-speed railway
It is increasing Deng construction demand, but these public infrastructures are because many considerations such as safe and stable are sunk to works
The requirement more and more higher of drop and bearing capacity, pile foundation is widely used in infrastructure construction due to the significant advantage with this respect
In, and achieve significantly achievement.
But the research for pile foundation finds：Stake not only directly takes on vertical load sometimes, but also can bear lateral
Load.Common this kind of stake has slopes friction pile, bank protection stake and road and bridge pile foundation etc..The stress of this kind of stake than
General stake is much more complex, because stake may cause the lateral off normal of pilework in the presence of side force, in vertical lotus
Carry and lateral load collective effect under pile crown there is additional Order Moment, trigger lateral deflection deformation, the destruction of stake, reduce making for pile foundation
With the life-span, or even cause engineering accident.Therefore, it is necessary to be researched and analysed to the Laws of Mechanics of this kind of stake.
For mechanical response rule of the research stake under vertical, lateral or its combination stressed state, indoor model examination
Test is to study one of conventional means of pile foundation Treating technology performance at present.But existing pile foundation test device is all only for stake in list
State under one load action is studied, it is impossible to stake different stresses or its it is combination stressed under carry out Pile Soil effect
The simulation laboratory test research of rule.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of group of research interaction between pile and soil
Box-like proportional loading experimental rig and test method.Experimental rig of the invention can be realized to the test pile difference under different conditions
Or carry out the loading of vertical and horizontal direction simultaneously, the stress of analysis system research pile body-answer is loaded by servo dynamic control
Change and the soil pressure or Pore-Water Pressure of pile peripheral earth, and determine between pile deflection and stake stress
Relation.For technical guidance is made in the theoretical research and mechanical analysis of later stake.Simple and reasonable, the practical side of the present invention
Just, stablize, convenient transport, assembling and storage, simple to operate, convenient data processing and the advantage that can be recycled, fit
It is wider with scope.
To achieve the above object, the present invention uses following technical proposals：
A kind of combined type proportional loading experimental rig for studying interaction between pile and soil, including vertical loading device and transverse direction
Loading device, the vertical loading device is connected with cushion cap top surface, and the horizontal loading device is connected with cushion cap side；It is described to hold
Platform bottom treats that peg is connected with multiple, described to treat that peg periphery is filled out and set the soil body.Vertical loading device and laterally loading in the present invention
Device is applied in combination, the vertical and lateral complicated applied force state of stake in convenient simulation Practical Project in process of the test；It is horizontal
Loading force is passed to by cushion cap to loading device and vertical loading device and treats peg, so that between studying the Pile Soil of pile foundation
Interaction property.
The soil body is arranged in chamber, and the chamber includes the located space surrounded by multiple case sides main body；Institute
Case side main body is stated to be formed by connecting by many Pin steel gratings.
The steel grating is in matrix pattern, is connected by connector between steel grating.
To prevent experiment soil from being spilt from centre, poly (methyl methacrylate) plate is set in the inner side of the steel grating, for limiting soil
Movement prevent it from spilling.
Preferably, the cushion cap top surface and side are respectively provided with free load plate, and the free load plate of cushion cap top surface is set hangs
Ring is connected with vertical loading device, and the free load plate of cushion cap side sets link and is connected with horizontal loading device.
Described to treat that peg is axially uniformly arranged multiple foil gauges along pile body, the foil gauge is connected with controller.
Requirement and purpose according to experiment, are vertically uniformly arranged multiple earth pressure gauges or pore water pressure in the soil body
Power meter.
The vertical loading device includes vertical hydraulic means, and the motion end of vertical hydraulic means is connected with cushion cap top surface.
The vertical hydraulic means top is connected with horizontal reaction frame, and reaction beam is fixed at the horizontal reaction frame two ends
On.
The vertical hydraulic means is provided with vertical displacement sensor.
The horizontal loading device includes transverse hydraulic device, and the motion end of transverse hydraulic device is connected with cushion cap side.
The transverse hydraulic device is arranged on reaction plate, and the reaction plate is fixed on vertical reaction frame.
The transverse hydraulic device is provided with lateral displacement sensor.
A kind of test method of the combined type proportional loading experimental rig for studying interaction between pile and soil, comprises the following steps：
Step 1：According to test requirements document, the size of experimental rig is determined, assemble experimental rig；
Step 2：Treating that peg sidepiece sets foil gauge, disposed in experimental rig with setting a spacing and treat peg；
Step 3：The soil body is set treating that peg periphery is filled out, the embedding earth pressure gauge in setting position or pore water pressure in the soil body
Meter；
Step 4：Stake top portion to be measured is connected with cushion cap, vertical loading device and horizontal loading device are setting load mode
Vertical force and cross force are applied to cushion cap respectively；
Step 5：Collection test data, carries out Treatment Analysis, obtains the Pile Soil body phase interaction to be measured under different stresses
Changing Pattern firmly.
Beneficial effects of the present invention are：
1st, the present invention uses high-strength steel material, and intensity and rigidity are higher, can meet the requirement of experiment loading, and can make for a long time
With；Model is fabricated structure, is installed, transport and storage are capable of achieving modularization, for testing great convenience, and can be
Reclaimed after off-test, reused, it is to avoid the wasting of resources, effectively reduced testing expenses.
2nd, the vertical and lateral loading system of pilot model apparatus of the present invention can be combined and use, in process of the test
The vertical and lateral complicated applied force state of stake in Practical Project can easily be simulated.
3rd, of the invention is that hydraulic loading system is controlled by servo dynamic loading system, loading stabilization, reliability,
And various complicated Mechanical loading modes can be realized by servo loading system, therefore, the present invention has more accuracy, is capable of achieving
The experimental simulation research of the interaction between pile and soil under high accuracy
4th, a kind of combined type proportional loading experimental rig and method for studying interaction between pile and soil proposed by the present invention, can
Interaction between pile and soil characteristic research for studying pile foundation, determines the stake under the restrained condition of piles with different bottom in piles with different under
Influence each other distance and pile peripheral earth coverage.Based on test data, promoted for the theoretical research of stake and engineer applied and provided
Experiment basic parameter.
5th, servo loading system and each data collecting instrument are gathered together by data integrated system, is capable of achieving on one side
Load stress-strain change and the soil pressure and pore water pressure of pile peripheral earth while to the pile body under different stress states
Delta data is analyzed treatment, saves the time of Data Post, high degree of automation, saves total time on test.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrated for explaining the application, does not constitute the improper restriction to the application.
Fig. 1 is experimental rig axonometric drawing of the present invention；
Fig. 2 is horizontal loading device axonometric drawing；
Fig. 3 is the foil gauge installation site figure of pile body；
Fig. 4 is the position view of vertically loading earth pressure gauge or pore pressure gauge；
Fig. 5 is level to loading earth pressure gauge or the position view of pore pressure gauge；
In figure, 1, chamber；2nd, steel grating；3rd, reaction beam；4th, cushion cap；5th, free load plate；6th, reaction frame；7th, vertical liquid
Pressure jack；8th, vertical displacement sensor；9th, lateral reaction frame；10th, reaction plate；11st, side hydraulic jack；12nd, lateral position
Displacement sensor；13rd, earth pressure gauge；14th, foil gauge.
Specific embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
Be also intended to include plural form, additionally, it should be understood that, when in this manual use term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
In a kind of typical implementation method of the application, as Figure 1-5, there is provided one kind research interaction between pile and soil
Combined type proportional loading experimental rig, the device is by chamber, vertical loading device, servo dynamic load analysis system, position
Displacement sensor, lateral loading device, earth pressure gauge, pore pressure gauge, foil gauge, data collecting instrument and free rotor plate etc.
Composition；
Chamber 1 includes the located space surrounded by multiple case sides main body, is surrounded using 4 case side main bodys in the present embodiment
Chamber entirety, case side main body is formed by connecting by many Pin steel gratings 2.Many Pin steel gratings are the presentation sphere of movements for the elephants shapes of steel plate welding
Device, surrounding offers bolt circular hole.A special test space is constituted for the splice elements as chamber, as research
The combined type proportional loading experimental rig main body of interaction between pile and soil.Connected by flange gasket and high-strength bolt per Pin steel gratings
Connect.
Multiple is set in chamber 1 and treats peg, stake top portion to be measured sets cushion cap 4, treats that peg periphery is filled out and set the soil body；
The top surface of cushion cap 4 and side are respectively provided with free load plate 5, the free load plate 5 of the top surface of cushion cap 4 set link with it is vertical
Loading device is connected, and the free load plate 5 of the side of cushion cap 4 sets link and is connected with horizontal loading device.
Steel plate lattice 2 are to bear to test the agent structure that soil body lateral displacement deforms stress, to prevent experiment soil from centre
Spill, its inner side is provided with thicker high-strength poly (methyl methacrylate) plate.
Vertical loading device, the relatively independent installation of lateral loading device, vertical loading device, lateral loading device are equipped with
Hydraulic loading device, and servo dynamic control loading analysis system can be installed, servo dynamic control loads analysis system to adopting
The data of collection are analyzed treatment.
Peg week embedded earth pressure gauge or pore pressure gauge is treated in the soil body, is treating peg along pile body axially uniform installation
Foil gauge, loads analysis system and enters hydraulic loading device, data collecting instrument and displacement transducer by servo dynamic control
Row is integrated, realizes the collection to test data, and loading analysis system analysis module by the servo dynamic control draws loading
Pile lateral earth pressure and pile body stress change curve, realize the simulation loading and number to stake under research interaction between pile and soil
According to Treatment Analysis.
Vertical loading device includes vertical reaction frame 6, reaction beam 3, and vertical reaction frame 6 is (i.e. vertical with hydraulic loading device
Hydraulic means) connection, hydraulic loading device uses vertical hydraulic jack 7 in the present embodiment；Lateral loading device is lateral anti-
Power frame 9, reaction plate 10, lateral reaction frame 9 are connected with hydraulic loading device (i.e. transverse hydraulic device), and hydraulic pressure adds in the present embodiment
Carry and put using side hydraulic jack 11.Vertically carried out with high-strength bolt by flange gasket between reaction frame 6 and reaction beam 3
It is connected, is connected with high-strength bolt by flange gasket between lateral reaction frame 9 and reaction plate 10, and vertical loading device
It is motionless experiment ground to be each attached to lateral loading device.
Vertical hydraulic means, transverse hydraulic device can be added by the load mode of command displacement or control stress
Carry.
Displacement transducer includes the vertical displacement sensor 8 being arranged in vertical hydraulic jack 7 and installed in lateral
Lateral displacement sensor 12 in hydraulic jack 11, can respectively realize the monitoring to vertical displacement, the lateral displacement of pile crown, be
The loading of the different directions to stake is realized, pile crown is placed in using the free load plate, free load plate is in vertical, side
To being equipped with the link that is connected with vertical hydraulic jack 7, side hydraulic jack 11.
Experimental rig of the invention is applicable to the stake of different conditions, the stake of different conditions refer to a number, stake footpath, pilespacing,
Long, stake the modulus of stake, the section form of stake, stake bottom constraint type, are made test pile by the form of prefabricated maintenance, and
The constraint type at stake bottom is selected according to actual conditions.
Foil gauge 14 should be mounted equidistant in the diameter both sides for treating peg, and by stake radial line where foil gauge and lateral liquid
The center line of jack 11 is pressed to overlap, requirement and purpose according to experiment are vertically uniformly arranged multiple soil pressures in the soil body
Meter or pore pressure gauge, use earth pressure gauge 13, earth pressure gauge 13 then prolonging the embedded number row in a footpath direction, using in the present embodiment
In the soil pressure of measurement soil around pile.
Servo dynamic control loading analysis system is to add earth pressure gauge or pore pressure gauge, displacement transducer and hydraulic pressure
The data of loading system carry out extraction record；The number that analysis system analysis module will be obtained is loaded by the servo dynamic control
According to treatment is analyzed, pile strain or stress of the stake under different stresses, the soil pressure of pile peripheral earth or hole are obtained
Water pressure Changing Pattern and pile deflection Changing Pattern.
Different stresses refer to vertical load, lateral load or its combination that pile is received, and are dynamically controlled by servo
System loading analysis system determines the load mode (Bit andits control or power are controlled) to stake, and determines Impact direction (the vertical, side of stake
To or carry out simultaneously), the loading variation pattern of each Impact direction is then determined respectively, can according to the actual loading situation of stake,
Realize the combined type proportional loading to test pile.
In the typical implementation method of another kind of the application, there is provided a kind of combined type ratio for studying interaction between pile and soil
The test method of example load testing machine, comprises the following steps：
Step 1：According to test requirements document, the size of experimental rig is determined, assemble experimental rig；
Step 2：Treating that peg sidepiece sets foil gauge, disposed in experimental rig with setting a spacing and treat peg；
Step 3：The soil body is set treating that peg periphery is filled out, the embedding earth pressure gauge in setting position or pore water pressure in the soil body
Meter；
Step 4：Stake top portion to be measured is connected with cushion cap, vertical loading device and horizontal loading device are setting load mode
Vertical force and cross force are applied to cushion cap respectively；
Step 5：Collection test data, carries out Treatment Analysis, obtains the Pile Soil body phase interaction to be measured under different stresses
Changing Pattern firmly.
Specifically, above-mentioned test method is as follows：
The size of model is determined according to test requirements document and purpose, the installation combination of steel grating is then carried out, and to its inwall
Carry out the adhesive seal water-proofing treatment of high-strength poly (methyl methacrylate) plate；
Vertical loading device and lateral loading device are carried out to position assembled fixation, hydraulic loading device is installed and servo is dynamic
State controlled loading analytical equipment；
The installation that prefabricated stake carries out foil gauge is posted, the quantity of the stake according to test requirements document, stake spacing and stake
The constraint type at bottom determines the setting of the stake in chamber, and according to the embedding soil pressure of design attitude in pile peripheral earth
Meter, pore pressure gauge；
After being embedded into predetermined altitude, to realize the unified loading to many, cushion cap need to be attached to pile crown, cushion cap can root
Carried out according to actual conditions prefabricated or cast-in-place.
Free load plate is placed on cushion cap, and vertical, lateral hydraulic loading system is respectively aligned to freely to add
Vertical, the lateral loading link of support plate carries out bolt anchor connection, while installing corresponding displacement transducer, is then dynamically controlled in servo
The load mode (Bit andits control or power are controlled) to stake is determined in system loading analysis system, and determines the Impact direction of stake (vertically,
Laterally or simultaneously carry out), the loading variation pattern according to each Impact direction realizes the combined type proportional loading to test pile.
Loading analysis system by servo dynamic control carries out the data that data collecting instrument and displacement transducer are collected
Treatment and analysis, obtain pile strain-stress of the stake under different stresses, the soil pressure of pile peripheral earth or pore water pressure
Changing Pattern between Changing Pattern and pile deflection and loading force.
In order that obtaining those skilled in the art can clearly understand the technical scheme of the application, below with reference to tool
The embodiment of body describes the technical scheme of the application in detail.
The operating process tested using experimental rig of the present invention is：
1st, the size of model is determined according to test requirements document and purpose, locating dowel 1, steel grating 2 is then carried out into installation combination,
And the adhesive seal water-proofing treatment of high-strength poly (methyl methacrylate) plate is carried out to its inwall；
2nd, reaction beam 3, reaction frame 6, lateral reaction frame 9, reaction plate 10 are assembled into vertical loading device and lateral respectively
Loading device simultaneously positions fixation, respectively by vertical hydraulic jack 7, vertical displacement sensor 8, side hydraulic jack 11, side
It is installed in loading device to displacement transducer 12.
3rd, the installation that prefabricated stake carries out foil gauge 14 is posted, the quantity of the stake according to test requirements document, stake spacing with
And the constraint type at stake bottom determines the setting of the stake in chamber, and according to the embedding soil pressure of design attitude in pile peripheral earth
Power meter 13 or pore pressure gauge；
4th, after being embedded into predetermined altitude, to realize the unified loading to many, cushion cap 4, cushion cap need to be attached to pile crown
Can be carried out according to actual conditions prefabricated or cast-in-place；
5th, free load plate 5 is placed on cushion cap 4, and the ring interface of vertical, lateral hydraulic jack is divided
Not Dui Zhun free load plate it is vertical, lateral loading link carry out bolt anchor connection, while installing corresponding vertical displacement sensor
8th, lateral displacement sensor 12, then determines load mode (the displacement control to stake in servo dynamic control loading analysis system
System or power control), and determine the Impact direction (vertical, lateral or while carry out) of stake, the loading according to each Impact direction becomes
Change mode, realizes the combined type proportional loading to test pile.
6th, analysis system is loaded by servo dynamic control to enter the data that data collecting instrument and displacement transducer are collected
Row treatment and analysis, obtain pile strain-stress of the stake under different stresses, the soil pressure of pile peripheral earth or pore water pressure
Changing Pattern between power Changing Pattern and pile deflection and loading force.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of combined type proportional loading experimental rig for studying interaction between pile and soil, it is characterized in that, including vertical loading device
With horizontal loading device, the vertical loading device is connected with cushion cap top surface, and the horizontal loading device is connected with cushion cap side；
The cushion cap bottom treats that peg is connected with multiple, described to treat that peg periphery is filled out and set the soil body.
2. experimental rig as claimed in claim 1, it is characterized in that, the soil body is arranged in chamber, the experiment case and bag
Include the located space surrounded by multiple case sides main body；Case side main body is formed by connecting by many Pin steel gratings.
3. experimental rig as claimed in claim 2, it is characterized in that, the steel grating is in matrix pattern, is passed through between steel grating
Connector is connected；Poly (methyl methacrylate) plate is set on the inside of the steel grating.
4. experimental rig as claimed in claim 1, it is characterized in that, the cushion cap top surface and side are respectively provided with free load plate,
The free load plate of cushion cap top surface sets link and be connected with vertical loading device, the free load plate setting link of cushion cap side and
Horizontal loading device connection.
5. experimental rig as claimed in claim 1, it is characterized in that, it is described to treat that peg is axially uniformly arranged multiple strains along pile body
Piece, the foil gauge is connected with controller；Multiple earth pressure gauges or pore water pressure are vertically uniformly arranged in the soil body
Meter.
6. experimental rig as claimed in claim 1, it is characterized in that, the vertical loading device includes vertical hydraulic means, erects
It is connected with cushion cap top surface to the motion end of hydraulic means.
7. experimental rig as claimed in claim 6, it is characterized in that, the vertical hydraulic means top connects with horizontal reaction frame
Connect, the horizontal reaction frame two ends are fixed on reaction beam；The vertical hydraulic means is provided with vertical displacement sensor.
8. experimental rig as claimed in claim 1, it is characterized in that, the horizontal loading device includes transverse hydraulic device, horizontal
It is connected with cushion cap side to the motion end of hydraulic means.
9. experimental rig as claimed in claim 8, it is characterized in that, the transverse hydraulic device is arranged on reaction plate, described
Reaction plate is fixed on vertical reaction frame；The transverse hydraulic device is provided with lateral displacement sensor.
10. the test method of the experimental rig as described in claim any one of 1-9, it is characterized in that, comprise the following steps：
Step 1：According to test requirements document, the size of experimental rig is determined, assemble experimental rig；
Step 2：Treating that peg sidepiece sets foil gauge, disposed in experimental rig with setting a spacing and treat peg；
Step 3：The soil body is set treating that peg periphery is filled out, the embedding earth pressure gauge in setting position and pore pressure gauge in the soil body；
Step 4：Stake top portion to be measured is connected with cushion cap, vertical loading device and horizontal loading device are distinguished with setting load mode
Vertical force and cross force are applied to cushion cap；
Step 5：Collection test data, carries out Treatment Analysis, obtains the Pile Soil body phase interreaction force to be measured under different stresses
Changing Pattern.
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| CN108505548A (en) * | 2018-03-27 | 2018-09-07 | 山东大学 | A kind of Piled Embankments stake soil loading ratio experimental rig and test method |
| CN108914982A (en) * | 2018-05-21 | 2018-11-30 | 同济大学 | High-speed rail pile Reinforced subgrade long-term settlement model test apparatus under mobile cyclic load |
| CN108982224A (en) * | 2018-09-29 | 2018-12-11 | 广州市建筑科学研究院新技术开发中心有限公司 | A kind of experimental rig and method of test pile and slip casting soil body contact surface failure mechanism |
| CN109060532A (en) * | 2018-07-30 | 2018-12-21 | 中国地质大学（武汉） | A kind of karst area ultra-long pile buckling stability indoor model experiments device and method |
| CN112857782A (en) * | 2021-03-04 | 2021-05-28 | 郑州大学 | Soil nail stress simulation test device, soil nail and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181180A (en) * | 2018-01-19 | 2018-06-19 | 浙江大学 | It is a kind of to simulate the experimental rig and method for causing the variation of negative friction of pile neutral point by ground preloading |
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| CN108505548A (en) * | 2018-03-27 | 2018-09-07 | 山东大学 | A kind of Piled Embankments stake soil loading ratio experimental rig and test method |
| CN108505548B (en) * | 2018-03-27 | 2024-01-19 | 山东大学 | Pile-bearing type embankment pile-soil load ratio test device and test method |
| CN108914982A (en) * | 2018-05-21 | 2018-11-30 | 同济大学 | High-speed rail pile Reinforced subgrade long-term settlement model test apparatus under mobile cyclic load |
| CN109060532A (en) * | 2018-07-30 | 2018-12-21 | 中国地质大学（武汉） | A kind of karst area ultra-long pile buckling stability indoor model experiments device and method |
| CN109060532B (en) * | 2018-07-30 | 2023-09-15 | 中国地质大学（武汉） | Karst area ultra-long pile buckling stability indoor model experimental device and method |
| CN108982224A (en) * | 2018-09-29 | 2018-12-11 | 广州市建筑科学研究院新技术开发中心有限公司 | A kind of experimental rig and method of test pile and slip casting soil body contact surface failure mechanism |
| CN112857782A (en) * | 2021-03-04 | 2021-05-28 | 郑州大学 | Soil nail stress simulation test device, soil nail and test method |
| CN112857782B (en) * | 2021-03-04 | 2022-12-13 | 郑州大学 | Soil nail stress simulation test device, soil nail and test method |
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