CN110208112A - A kind of unsaturated soil-structural material contact surface boxshear apparatus and test method controlling relative humidity - Google Patents
A kind of unsaturated soil-structural material contact surface boxshear apparatus and test method controlling relative humidity Download PDFInfo
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- CN110208112A CN110208112A CN201910047621.8A CN201910047621A CN110208112A CN 110208112 A CN110208112 A CN 110208112A CN 201910047621 A CN201910047621 A CN 201910047621A CN 110208112 A CN110208112 A CN 110208112A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000011068 loading method Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 238000010008 shearing Methods 0.000 claims description 23
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- 239000011449 brick Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
The invention discloses a kind of unsaturated soil-structural material contact surface boxshear apparatus and test method for controlling relative humidity, and closed pressure chamber and humidity environment control module is arranged；Shear box is located in pressure chamber, wherein the vertical pressure transmission bar of vertical loading and displacement measurement system, the pushing ram of horizontal loading and displacement measurement system and pressure transmission bar are respectively by protruding into pressure chamber's cavity and connecting with shear box with side wall at the top of pressure chamber；Humidity environment control module include humidity control system for controlling pressure chamber inner cavity humidity and with the Temperature Humidity Sensor of the system support.Entire boxshear apparatus suction control range is wide, relative humidity can continuous control, being capable of true reappearance Practical Project scene moisture condition, controllable, broad suction force range, unsaturated soil-structural material contact face mechanical property suitable for different great soil groups and different structure material can be obtained, and obtained shear stress is more accurate, more avoids the stress concentration phenomenon in shear history.
Description
Technical field
The present invention relates to geotechnical engineerings and Structural Engineering experimental study technical field, relatively wet more particularly, to a kind of control
The unsaturated soil of degree-structural material contact surface boxshear apparatus and test method.
Background technique
Dynamic soil-sturcture interaction mechanical characteristic is always the hot spot of geotechnical engineering Yu structural engineering field research, is related to
To Practical Projects such as stake-soil contact face, soil-dam body contact surface, soil-retaining wall contact surface, soil-bottom of foundation contact surfaces.
The soil body and structure interface are often directly exposed under atmospheric environment, by Atmospheric precipitation (rain, snow, graupel, hail etc.), are steamed
The water translocations such as hair, freeze thawing effect, thus the soil body and structural material are usually unsaturated, soil-structural wood under unsaturated state
The mechanics parameters of material contact surface are the important indicators of correlation engineering design.
But existing dynamic soil-sturcture interaction mechanical property testing equipment, such as interface shearing instrument equipment can not be controlled
Suction processed, i.e., can not the corresponding moisture condition of broad suction force range in accurate reproduction Practical Project, broad suction model can not be obtained
Enclose unsaturated soil under interior target humidity-structural material contact face mechanical property.
Summary of the invention
The present invention provides a kind of unsaturated soil-structural wood for controlling relative humidity aiming at the deficiencies in the prior art
Expect contact surface boxshear apparatus, soil-structural material contact surface power under unsaturated state is obtained by active continuous control relative humidity
Learn characteristic.
To achieve the goals above, unsaturated soil-structural material contact surface of the control relative humidity designed by the present invention
Boxshear apparatus, including shear box, vertical loading and displacement measurement system, horizontal loading and displacement measurement system, data acquisition and place
Module is managed, is characterized in that
It further include closed pressure chamber, humidity environment control module；
The shear box is located in pressure chamber, vertical pressure transmission bar, the water of the vertical loading and displacement measurement system
The pushing ram and pressure transmission bar of flat loading and displacement measurement system at the top of pressure chamber with side wall respectively by protruding into pressure chamber's cavity
It is connect with shear box；
The humidity environment control module includes humidity control system for controlling pressure chamber inner cavity humidity and with this is
It unites matched Temperature Humidity Sensor.
Further, the humidity control system is the automatic relative humidity control system of AUTO-RH, the controllable model of relative humidity
Enclose is 1%~95%.
Further, the Temperature Humidity Sensor and the air stream outlet of the automatic relative humidity control system of AUTO-RH point
Pressure chamber inner cavity is not protruded into from pressure chamber two sidewalls.
Further, the pressurization upper cover of the straight shear device is equipped with the wet air-flow access connecting with humidity control system
Hole；The pressurization upper cover bottom is provided with Diffusion of gas stream groove, and the Diffusion of gas stream groove and the wet air-flow access aperture connect
It is logical；The wet gas of the humidity environment control module divides two-way, is passed directly into pressure chamber's cavity all the way, and another way passes through wet
Air-flow access aperture is passed through soil sample upper surface through pressure transmission plate again.
Further, several Diffusion of gas stream holes are densely covered on the pressure transmission plate of the shear box.
Further, the left and right side of the pressure chamber, upper top surface are all made of steel plate and are made, the front and back side of the pressure chamber
Face uses transparent organic glass plate.
Further, the upper shear box cross section is the square of side length 70mm, and the height of the upper shear box is
20mm, longitudinally opens that diameter is 50mm through-hole, aperture depth is 20mm；The lower shear box cross section is the pros of side length 120mm
Shape, the lower shear box with a thickness of 25mm, longitudinal aperture side length is 100mm square hole, aperture depth is 20mm.
A kind of unsaturated soil-structural material contact surface boxshear apparatus test side for controlling relative humidity has also been devised in the present invention
Method is characterized in that, comprising the following steps:
Structural material is put into lower shear box, and is built into unsaturation soil sample in upper shear box；
The side wall and top plate that pressure chamber is installed on apparatus platform, form closed pressure chamber；
Humidity environment control module is installed, closed-loop control system is constituted；
Vertical loading and displacement measurement system, horizontal loading and displacement measurement system, data acquisition and processing (DAP) module are installed；
Until loading vertical load to the stabilization of sample under target humidity；By servo motor, sheared with target
Rate shears unsaturated soil-structural material contact surface, while measuring shear displacemant and shearing force, until target maximum shear
Displacement；
After shearing, unsaturation soil sample, structural material are taken out, mass metering after drying, surveys moisture content；
Shearing test successively is carried out under different vertical loads, different relative humidity, it is different relatively wet by calculating acquisition
Spend lower unsaturated soil-structural material contact face mechanical performance indicator.
Further, the unsaturation soil sample can be unsaturation clay or unsaturation sand, the unsaturation clay packet
Undisturbed soil sample, compacted samples or compacted soil samples are included, unsaturation sand is directly prepared with the method for raining；The structural material includes mixed
Concrete board, steel plate, building block, brick, stone material or mortar specimen.The boxshear apparatus is suitable for different great soil groups and different structure material is indirect
Contacting surface Mechanics Performance Testing.
Further, longitudinal opening diameter of the upper shear box is 50mm, aperture depth is 20mm；The lower shear box
Longitudinal aperture side length be 100mm, aperture depth is 20mm；When test, diameter 50mm, height 15mm are put into upper shear box
Soil sample, the structural material of side length 100mm, height 20mm are put into lower shear box.Box pair in shearing due to placing soil sample
The soil sample diameter answered is 50mm, box counter structure material side length 100mm under the shearing of displacement structure material, soil-in shear history
The area of structural material contact surface remains unchanged, and obtained shear stress is more accurate, and avoids the concentration of the stress in shear history
Phenomenon.
The present invention has the advantages that
Suction control range is wide, relative humidity can continuous control, can true reappearance Practical Project scene moisture condition, energy
Enough unsaturated soil-structural material contact face mechanical properties for obtaining controllable, broad suction force range.
Suitable for different great soil groups and the face Mechanics Performance Testing of different structure material contact.
Soil-structural material contact surface area remains unchanged in shear history, and obtained shear stress is more accurate, and avoids
Stress concentration phenomenon in shear history.
Detailed description of the invention
Unsaturated soil-structural material contact surface boxshear apparatus of Fig. 1 control relative humidity.
Fig. 2 unsaturated soil-structural material contact surface boxshear apparatus side view.
Fig. 3 unsaturated soil-structural material contact surface boxshear apparatus top view.
Fig. 4 is pressurization upper cover of the invention.
Fig. 5 is the top view of Fig. 4.
Fig. 6 is the bottom view of Fig. 4.
Fig. 7 is pressure transmission plate of the invention.
Fig. 8 is pressure transmission plate cross-sectional view of the present invention.
Fig. 9 is upper shear box of the invention.
Figure 10 is the top view of Fig. 9.
Figure 11 is lower shear box of the invention.
Figure 12 is the left view of Figure 11.
Figure 13 is the top view of Figure 11.
Figure 14 is horizontal direction pressure transmission rod structure schematic diagram of the invention.
Figure 15 is vertical pressure transmission rod structure schematic diagram of the invention.
Figure 16 is horizontal direction pushing ram of the invention.
Figure 17 is pressure transmission rod set structural schematic diagram of the invention.
Figure 18 is the top view of Figure 17.
Figure 19 is guide rail structure schematic diagram of the invention.
Figure 20 is the top view of Figure 19.
Figure 21 is side transparent plexiglass plate structural schematic diagram before and after pressure chamber of the invention.
Figure 22 is the top view of Figure 21.
Figure 23 is balancing gate pit's top board structural schematic diagram of the invention.
Figure 24 is the top view of Figure 23.
Figure 25 is steel plate structure schematic diagram on the left of pressure chamber of the invention.
Figure 26 is the bottom view of Figure 25.
Figure 27 is steel plate structure schematic diagram on the right side of pressure chamber of the invention.
Figure 28 is the bottom view of Figure 27.
In figure: 1 pressure transmission rod set, 1.1 cored screws, 1.2 O-ring seals, 1.3 screw holes；2 horizontal pushing rams, 2.1 activities
Clamp；3 pressure chambers；4 left side steel plates, 4.1 left side steel plate screw holes, 4.2 wet gas inflow holes, 4.3 horizontal full-lengths serve as a contrast item, 4.4 linings
Screw hole, 4.5 vertical lining items；4.6 vertical lining screw holes；5 tee tubes；6 vertical pressure transmission bars；7 top surface steel plates, 7.1 top plate screw holes,
7.2 gas vents, 7.3 the second screw holes of top plate；8 pressurization upper covers, 8.1 wet air-flow access aperture, 8.2 Diffusion of gas stream slots；9 porous metals
Pressure transmission plate, 9.1 Diffusion of gas stream holes；Shear box on 10,10.1 connectors；11 vertical loadings and displacement measurement system, 11.1 is vertical
Displacement sensor；12 concrete slabs or other structural materials；13 descend shear boxs, and 13.1 connectors, 13.2 descend inside shear boxs,
13.3 lower shear box bottom concave grooves；14 guide rails, 14.1 bearings；15 baffles；16 horizontal loadings and displacement measurement system, 16.1 water
Prosposition displacement sensor；The automatic relative humidity control system of 17 AUTO-RH；18 Temperature Humidity Sensors；19 right side steel plates, 19.1 is right
Side steel plate screw hole, 19.2 Temperature Humidity Sensors are inserted into hole, and 19.3 right steel plate horizontal full-lengths serve as a contrast item, and 19.4 right side steel plates serve as a contrast a spiral shell
Hole, 19.5 right side steel plates vertically serve as a contrast item, and 19.6 right side steel plates vertically serve as a contrast a screw hole；20 computers；21 horizontal pressure transmission bars；22 is organic
Glass panel, 22.1 perspex panels screw holes；23 apparatus platforms；24 test soil samples.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
Unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity shown in figure, including humidity environment control
Molding block, the pressure chamber 3 of the interior sealing for setting straight shear device, vertical loading and displacement measurement system 11, horizontal loading and displacement
Examining system 16, data acquisition and processing (DAP) module, data acquisition and processing (DAP) module major function are the opposite of closed-loop control pressure chamber
Humidity, acquisition vertical force and vertical displacement, horizontal force and horizontal displacement, calculate shear stress, draw contact surface shear stress-shearing position
Move relation curve；
Humidity environment control: including the automatic relative humidity control system 17 of AUTO-RH, Temperature Humidity Sensor 18；AUTO-RH
Automatic relative humidity control system controls relative humidity by the air-flow ratio of control dry air and humid air, and by temperature and humidity
18 feedback pressure room temperature of sensor and humidity give data acquisition and processing (DAP) module, form closed-loop control.
Closed pressure chamber 3 includes left side steel plate 4, top surface steel plate 7, right side steel plate 19 and front and back clear perspex panel
22.Left side steel plate 4 and right side steel plate 19 pass through the elongated lining item being welded thereon and are fixed on apparatus platform 23；
The automatic relative humidity control system 17 of AUTO-RH passes through the wet air-flow access aperture 4.2 and pressure of pressure chamber's side wall
Room connects and controls the relative humidity of pressure chamber.
Straight shear device includes pressurization upper cover 8, upper shear box 10, porous metals pressure transmission plate 9, baffle 15,13 and of lower shear box
The guide rail 14 being fixed on apparatus platform, guide rail 14 are equipped with bearing 14.1；Lower 13 bottom of shear box is provided with 13.3 side of concave groove
Just it is stuck in the resistance reduced in progradation on platform rail 14；Baffle 15 is for fixed upper shear box 10；Straight shear device it is upper
Shear box places soil sample, lower shear box displacement structure material；
Vertical loading is made of with displacement measurement system 11 increased pressure frame, lever, counterweight, vertical displacement sensor 11.1；
Horizontal loading and displacement measurement system 16 are by servo motor, horizontal force snesor, 16.1 groups of horizontal displacement sensors
At；
Data acquisition and processing (DAP) module specific structure is as follows: the pressure that Temperature Humidity Sensor is connect will measure with computer
The temperature and humidity of room feeds back to computer 20；Vertical displacement is transferred to computer, vertical load root by vertical displacement sensor
It is determined according to lever-counterweight loading system counterbalance mass and lever ratio；The horizontal force snesor, horizontal displacement sensors 16.1
Horizontal force, horizontal displacement are transferred to computer；Vertical force and vertical displacement, horizontal force and horizontal displacement data are handled, are calculated
Shear stress obtains contact surface shear stress-shear displacemant relationship, contact surface shearing strength, contact surface angle of friction etc. under target humidity
Mechanical characteristic.
The control of pressure chamber's humidity environment, accesses Temperature Humidity Sensor 18 by pressure chamber side wall aperture and AUTO-RH is automatic
The wet air-flow that relative humidity control system 17 generates enters pressure chamber, guarantees stable and lasting required humidity environment.
The installation of entire boxshear apparatus for convenience, there are four top plate screw holes 7.1 for fixing vertical pass at top surface steel plate 7 middle part
The pressure transmission rod set 1 of compression bar 6 is provided with a gas vent 7.2 on top surface steel plate 7 and moistens airflow, top surface steel plate 7 for pressure chamber
Left and right the second screw hole of each two top plates 7.3 is used for fixing seal top plate and easy disassembly；There are four left plates at left side steel plate 4 middle part
Screw hole 4.1 is used to fix the rod set of horizontal pushing ram 2, is additionally provided with a wet air-flow access aperture 4.2 on the steel plate, is welded in a left side
Two following horizontal full-lengths serve as a contrast item 4.3 on side steel plate 4, and lower lining item is opened on upper lining item for securing a plate to apparatus platform
There are two lining screw holes 4.4 for fixing top plate 7, is welded on two vertical lining items 4.5 of left side 4 left and right sides of steel plate and is respectively provided with
Two vertical lining screw holes 4.6 are for fixed front and back clear perspex panel 22；Front and back clear perspex panel 22 is respectively opened
There are four panel screw holes 22.1 for fixing seal and easy to disassemble；There are four right steel plate screw holes 19.1 to use at right side steel plate 19 middle part
In being additionally provided with a Temperature Humidity Sensor insertion hole 19.2 in the rod set of the horizontal pressure transmission bar 21 of fixation, right side steel plate, it is welded in the right side
Following two right steel plate horizontal full-lengths serve as a contrast item 19.3 on the steel plate of side, and lower lining item is for securing a plate to apparatus platform, upper lining
It is opened on item and is used to fix top plate 7 there are two right lining screw hole 19.4, the right side steel plate of left and right two for being welded in right side steel plate is vertical
Respectively drive that there are two right side steel plates vertically serve as a contrast screw hole 19.6 for clear perspex panel 22 before and after fixed on lining item 19.5.
Vertical load pressure transmission rod set 1 is fixed on pressure chamber corresponding position by four top plate screw holes 7.1, cored screw
Screw hole 1.3 in 1.1 cooperation vertical load pressure transmission rod sets 1, which tightens pressure transmission rod set, can guarantee pressure chamber for the compression of sealing ring 1.2
Obturation effect.The pressure transmission rod set of horizontal loading and displacement measurement system 16 is identical as vertical load pressure transmission rod set structure, installation
Mode is also identical.
Horizontal 2 left end of pushing ram is the movable chuck 2.1 with internal thread button, when test, movable chuck can be led to
It crosses thread to be fixed on the propulsion head for pushing seat, movable chuck 2.1 cooperates the baffle 15 being fixed on apparatus platform can be real
Now shear box, which retracts, resets.
Pressurization upper cover 8 is provided with wet air-flow access aperture 8.1, and bottom is provided with the groove 8.2 uniformly spread convenient for wet air-flow.
The connector 10.1 of buckle shape is provided on upper shear box 10, which passes in which can be convenient with horizontal direction
Flexural pivot connection on compression bar 21.
Upper shear box cross section is the rectangular of side length 70mm, and the height of upper shear box is 20mm；Open diameter 50mm, depth
The through-hole of 20mm, for placing soil sample.
Lower shear box 13, cross section are the rectangular of side length 120mm, and the height of lower shear box is 25mm；Open side length 100mm,
The square hole of depth 20mm, for placing the structural woods such as concrete slab or steel plate or building block or brick or stone material or mortar specimen
Material.
Forward direction is realized on horizontal direction pressure transmission bar 21 in the card jail that the connector 13.2 being fixed on lower shear box can be convenient
Shearing test, lower 13 bottom of shear box are provided with 13.3 convenient card of concave groove and reduce resistance in progradation on platform rail 14
Power.
The Diffusion of gas stream hole 9.1 that sample is diffused into convenient for wet airflow is provided on porous metals pressure transmission plate 9, air-flow expands
Dissipating hole aperture is 0.1mm, pressure transmission plate thickness 5mm, diameter 50mm.Test soil sample and wet air-flow is facilitated to carry out water-vapor exchange.
Humidity environment control in pressure chamber's moistens air-flow access aperture 4.2 and accesses the automatic relative humidity control system production of AUTO-RH
Raw wet air-flow enters pressure chamber, and Temperature Humidity Sensor is inserted into hole 19.2 and accesses the automatic relative humidity control system of AUTO-RH
Temperature Humidity Sensor guarantees stable and lasting required humidity environment.It is fed back by the indoor Temperature Humidity Sensor of pressure warm and humid
Degree information gives relative humidity control system, to realize the closed-loop control of pressure indoor humidity.
It is two that the wet air-flow of cut-in pressure room is divided to by tee tube 5, and one is directly communicated to pressure chamber, and another is connected to
Wet air-flow access aperture 8.1 in upper cover 8 of pressurizeing accelerates sample suction equalization the time required to shortening test soil sample suction equalization.
Unsaturated soil-structural material contact surface boxshear apparatus test method of control relative humidity has also been devised in the present invention,
Detailed process is as follows:
1) preparation of test specimen: undisturbed soil sample, compacted samples or compacted soil samples, unsaturation can be used in unsaturation clay
Sand is directly prepared with the method for raining；Structural material can be concrete slab, steel plate, building block, brick, stone material, mortar specimen, test mesh
: obtain target humidity under unsaturated soil-structural material contact surface shear stress-shear displacemant relationship, contact surface shearing strength,
The mechanical characteristics such as contact surface angle of friction.
2) structural material 12 of side length 100mm, height 20mm are placed in lower shear box, by diameter 50mm, height 15mm
Soil sample 24 be placed in upper shear box, 5mm thickness pressure transmission expanded metal is placed on soil sample top.
3) left side steel plate, right side steel plate, front and back transparent plexiglass plate, the top surface steel plate for installing pressure chamber, form closing
Pressure chamber.
4) reach the wet air of target relative humidity by AUTO-RH automatic relative humidity control system transmission to pressure
Room feeds back temperature and humidity information by the indoor Temperature Humidity Sensor of pressure and gives relative humidity control system, to realize in pressure chamber
Humidity closed-loop control.
5) vertical displacement sensor is installed, zero setting is read.Apply target vertical load by lever-counterweight loading system.
Until the stabilization of sample under vertical load, for stability criterion to be constant every 6h vertical displacement sensor reading, deformation is steady
Surely mean sample suction equalization under target humidity under the state.
6) horizontal force snesor, horizontal displacement sensors are installed, zero setting is read.By servo motor, speed is sheared with target
Rate starts unsaturated soil-structural material contact surface shearing.Horizontal shear displacement and horizontal shear force are measured simultaneously, until target
Maximum shear displacement.
7) after shearing, unsaturation soil sample, structural material are taken out, mass metering after drying, surveys moisture content.
8) horizontal shear force is obtained into shear stress divided by soil sample area, in conjunction with respective horizontal shear displacemant, it is wet obtains target
Spend lower unsaturated soil-structural material contact surface shear stress-shear displacemant relationship.Take shear stress peak value point strong as contact surface shearing resistance
Degree.
9) successively carry out unsaturated soil under target humidity-structural material contact surface shearing examination under different vertical loads
It tests, obtains corresponding contact surface shearing strength.By vertical load divided by soil sample area, pressure at right angle is obtained.It is vertical with shearing strength
Coordinate, pressure at right angle are abscissa, draw shearing strength-pressure at right angle relation curve, and one-variable linear regression obtains its inclination angle i.e.
For unsaturated soil under target humidity-structural material contact surface angle of friction.
10) successively carry out unsaturated soil-structural material contact surface shearing test under different relative humidity, can get phase
To humidity to unsaturated soil-structural material contact surface shear stress-shear displacemant relationship, contact surface shearing strength, contact surface friction
The affecting laws at angle.
Claims (10)
1. it is a kind of control relative humidity unsaturated soil-structural material contact surface boxshear apparatus, including straight shear device, vertical loading with
Displacement measurement system (11), horizontal loading and displacement measurement system (16), data acquisition and processing (DAP) module, it is characterised in that:
It further include closed pressure chamber (3), humidity environment control module；
The straight shear device is located in pressure chamber (3), the vertical pressure transmission bar of the vertical loading and displacement measurement system (11) and
The pushing ram and pressure transmission bar of the horizontal loading and displacement measurement system (16) pass through respectively to be protruded at the top of pressure chamber (3) with side wall
It is connect in pressure chamber's cavity with straight shear device；
The humidity environment control module is closed-loop control system, including the humidity control for controlling pressure chamber (3) inner cavity humidity
System (17) processed and Temperature Humidity Sensor (18) with the system support.
2. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 1, feature exist
In: the humidity control system (17) is the automatic relative humidity control system of AUTO-RH.
3. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 2, feature exist
In:
The air stream outlet of the Temperature Humidity Sensor (18) and the automatic relative humidity control system (17) of AUTO-RH is respectively from pressure
Pressure chamber inner cavity is protruded into room (3) two sidewalls.
4. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 1, feature exist
In: the pressurization upper cover (8) of the straight shear device is equipped with the wet air-flow access aperture (8.1) connecting with humidity control system (17)；
Pressurization upper cover (8) bottom is provided with Diffusion of gas stream groove (8.2), the Diffusion of gas stream groove (8.2) and the wet gas
Flow access aperture (4.2) connection；The wet gas of the humidity environment control module divides two-way, is passed directly into pressure chamber (3) all the way
Cavity, another way are passed through soil sample upper surface by moistening the pressure transmission plate (9) of air-flow access aperture (8.1) straight shear device.
5. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 1, feature exist
In: the pressure transmission plate (9) of the straight shear device is metal pressure transmission plate, and several Diffusion of gas stream holes (9.1) are densely covered on pressure transmission plate.
6. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 1, feature exist
In: left and right side, the upper top surface of the pressure chamber (3) are all made of steel plate and are made, and the front and back sides of the pressure chamber (3) are using saturating
Bright poly (methyl methacrylate) plate.
7. unsaturated soil-structural material contact surface boxshear apparatus of control relative humidity according to claim 1, feature exist
In: the upper shear box (10) longitudinally opens the through-hole that diameter is 50mm, aperture depth is 20mm；Lower shear box (13) thickness
For 25mm, the square hole that side length is 100mm is longitudinally opened, aperture depth is 20mm.
8. a kind of unsaturated soil-structural material contact surface boxshear apparatus test of control relative humidity as described in claim 1
Method, which comprises the following steps:
Structural material is put into lower shear box, and is built into unsaturation soil sample in upper shear box；
Side wall, the top plate that pressure chamber is installed on apparatus platform, form closed pressure chamber；
Humidity environment control module is installed, closed-loop control system is constituted；
Vertical loading and displacement measurement system, horizontal loading and displacement measurement system, data acquisition and processing (DAP) module are installed；
Until loading vertical load to the stabilization of sample under target humidity；By servo motor, with target shear rate,
To unsaturated soil-structural material contact surface shearing, while shear displacemant and shearing force are measured, until target maximum shear is displaced；
After shearing, unsaturation soil sample, structural material are taken out, mass metering after drying, surveys moisture content；
Shearing test successively is carried out under different vertical loads, different relative humidity, obtains different relative humidity by calculating
Lower unsaturated soil-structural material contact face mechanical performance indicator.
9. unsaturated soil-structural material contact surface boxshear apparatus test side of control relative humidity according to claim 8
Method, it is characterised in that: the unsaturation soil sample includes unsaturation clay or unsaturation sand, and the unsaturation clay includes original state
Soil sample, compacted samples or compacted soil samples, unsaturation sand are directly prepared with the method for raining；The structural material include concrete slab,
Steel plate, building block, brick, stone material or mortar specimen.Boxshear apparatus can test different great soil groups and different structure material contact face mechanical property
Energy.
10. unsaturated soil-structural material contact surface boxshear apparatus test side of control relative humidity according to claim 8
Method, it is characterised in that: the longitudinal hole diameter of the upper shear box is 50mm, aperture depth is 20mm；The lower shear box
The square hole that side length is 100mm is opened in longitudinal direction, aperture depth is 20mm；When test, it is put into upper shear box by diameter 50mm, height
The soil sample of 15mm is put into the structural material of side length 100mm, height 20mm in lower shear box.Soil-structural material in shear history
The area of contact surface remains unchanged, and obtained shear stress is more accurate, and avoids the stress concentration phenomenon in shear history.
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