CN105004666B - A kind of geosynthetics contact surface frictional strength method of testing - Google Patents
A kind of geosynthetics contact surface frictional strength method of testing Download PDFInfo
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Abstract
A kind of geosynthetics contact surface frictional strength method of testing, it is characterized in that carrying out geosynthetics contact surface frictional strength parameter acquiring using a kind of experimental rig, the device includes reaction frame (1), loading frame (2), first servomotor (3), second servomotor (4), load sample platform (5), upper shear box (6), down cut box (7), railcar (8), horizontal slide rail (17), horizontal addload axle (22), Vertical loading axle (25) etc..By geosynthetics under different vertical load action and geologic body interphase interaction, the direct stress and shear stress on oblique section are obtained, so as to obtain its frictional strength parameter.This method can be used for the various geosynthetics run into civil engineering or Geological Engineering to include the acquisition of the frictional strength parameter of geotextile, geomembrane, geotextiles, GSZ, geonet, geotechnique's pad, geotechnological special material and earthwork composite material etc. between geologic body.
Description
Technical field
The present invention is a kind of geotechnical testament method, belongs in civil engineering or Geological Engineering field and is related to geosynthetics
The frictional strength testing field between geologic body.
Background technology
Geosynthetics is widely used in civil engineering or Geological Engineering field, and balanced answer can be provided for Rock And Soil
Power, and form a kind of composite construction system.As China's Geotechnical Engineering is built extensively and profoundly, reinforced earth technology, garbage loading embeading
Field pad pollution prevention technology etc. is promoted faster, and technology is applied considerably beyond theoretical research.How geotechnique synthesis material is determined
Expect the frictional strength in rock and soil slope, also measured so far without suitable experimental facilities, more at present is to use
The indexs such as geosynthetics horizontal shear intensity are designed and constructed, it is clear that can not meet geosynthetics or geotechnique knits
Thing etc. is layed in the ambient stress requirement on slope.The invention is exactly that one kind can lay geosynthetics on the slope,
And a kind of test method of its frictional strength between geologic body is tested, being applicable to various geosynthetics includes geotechnique
The frictional strength characteristic test of fabric, GSZ, geotextiles, geomembrane, geotechnological pad, earthwork composite material etc..
The content of the invention
It is an object of the present invention to provide a kind of geosynthetics contact surface frictional strength method of testing, for solving geotechnological conjunction
Into the frictional strength test of contact surface between material or geotextile and geologic body, technical parameter is provided for engineering practice.
The technical solution of the present invention, it is characterized in that using a kind of experimental rig, carrying out geosynthetics contact surface
Frictional strength parameter acquiring, the experimental rig include reaction frame 1, loading frame 2, the first servomotor 3, the second servomotor 4,
Load sample platform 5, upper shear box 6, down cut box 7, railcar 8, vertical displacement meter 9, the first vertical slide rail 10, upper box sample 11, rolling
Pearl axle row 12, lower box expansion board 13, lower box sample 14, the first jack 15, the first support base 16, horizontal slide rail 17, second
Support base 18, the second jack 19, transmission rod 20, connection end 21, horizontal addload axle 22, horizontal displacement meter 23, the first side
Limit post 24, Vertical loading axle 25, increased pressure board 26, the second lateral spacing post 27, telescopic arm 28, the 3rd lateral spacing post 29, the second vertical slide rail
30.First servomotor 3 connection Vertical loading axle 25, Vertical loading axle 25 provides pressure at right angle, above increased pressure board 26, plus
Pressing plate 26 connects vertical displacement meter 9, and increased pressure board 26 is located at the top surface of upper box sample 11, and upper shear box 6 is by the He of the first lateral spacing post 24
Second lateral spacing post 27 is fixed, and the first lateral spacing post 24 connects the first vertical slide rail 10, and the second lateral spacing post 27 passes through telescopic arm 28 and the
Three lateral spacing posts 29 are connected, and the 3rd lateral spacing post 29 connects the second vertical slide rail 30, and upper shear box 6 under the alignment of ball axle row 12 by cutting
Cut and box sample 11 is installed in box 7, upper shear box 6, lower box sample 14 is installed in down cut box 7, the lower box of the connection of down cut box 7 expands
Panel 13, the connection railcar 8 of down cut box 7, railcar 8 can be moved on load sample platform 5 along horizontal slide rail 17, horizontal slide rail 17
It is connected with loading frame 2, the first jack 15 connects the first support base 16, the second jack 19 connects the second support base
18, down cut box 7 connects transmission rod 20 and horizontal displacement meter 23, and connection end 21 is aligned with horizontal addload axle 22, horizontal addload
Axle 22 connects the second servomotor 4.The upper size of shear box 6 is the wide 500mm of long 500mm, connects the upper of the side of the first lateral spacing post 24
The a height of 445mm of box wall of shear box 6, a height of 155mm of box wall of the upper shear box 6 of connection the second lateral spacing post 27 side, down cut
The size of box 7 is the wide 500mm of long 500mm, and a height of 155mm of box wall of the down cut box 7 of the lower side of box expansion board 13 of connection, connection is passed
The a height of 445mm of box wall of the down cut box 7 of the side of power bar 20, it is 30 °, upper shear box 6 and down cut box 7 that ball axle, which arranges 12 inclination angles,
Using the high alloy material of light weight intensity, and carry out anodization preservative treatment, upper shear box 6 and down cut box 7 it is interior
Four angles of wall are circular design, and radius of corner is 30mm~60mm, and upper shear box 6 can be slided along lower box expansion board 13, first
Lateral spacing post 24 can vertically be slided along the vertical sliding motion of the first vertical slide rail 10, the 3rd lateral spacing post 29 along the second vertical slide rail 30
Dynamic, the first servomotor 3 and the second servomotor 4 pass through the applying power of reaction frame 1, reaction frame 1 and loading frame 2 and increased pressure board
26 use high-strength stainless steel material, and the gap length between increased pressure board 26 and upper shear box 6 is 2mm~4mm, ball axle row
12nd, lower box expansion board 13 and horizontal slide rail 17 are high-strength stainless steel material, and surface scribbles teflon.First watches
Fast forwarding and fast rewinding operation can be carried out by taking the servomotor 4 of motor 3 and second, can also carry out at the uniform velocity strain loading and stress adds
Carry, strain shear rate be 0.02~5.00mm/min, EIAJ up to 1000kN, measurement accuracy of exerting oneself up to 0.5%FS,
Stress shear rate is 100~600kN/min.The maximum range of vertical displacement meter 9 is 150mm, and measurement accuracy is up to 1mm, water
The maximum range of flat displacement meter 23 is 170mm, and measurement accuracy is up to 1mm.
The method for carrying out the test of geosynthetics contact surface frictional strength using the experimental rig is as follows：
(1) according to certain water content, rock-soil ratio and density requirements, the soil body, rubble and water of respective quality are weighed, by soil
Body, rubble, water three be well mixed, as compound, be divided into uniform three parts it is standby；
(2) railcar 8 is moved on load sample platform 5, upper shear box 6 is alignd down cut boxes 7 via ball axle row 12, by the
A compound is fitted into down cut box 7, and increased pressure board 26 is placed on compound, and railcar 8 is being moved into Vertical loading axle 25 just
Lower section, starts the first jack 15 and the second jack 19, by the first support base 16 and the second support base 18 respectively with adding
Carry framework 2 to contact, make railcar 8 hanging, start the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, press
It is required that applying pressure at right angle F, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement stops loading；
(3) the first servomotor 3 is started, unloading makes Vertical loading axle 25 leave the top cap of increased pressure board 26, starts first very heavy
The jack 19 of top 15 and second, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make track
Car 8 is contacted with horizontal slide rail 17, and railcar 8 is moved on load sample platform 5, takes out increased pressure board 26, by compound plucking, loads second
Part compound, increased pressure board 26 is placed on compound, and railcar 8 is moved to immediately below Vertical loading axle 25, starts first very heavy
The jack 19 of top 15 and second, the first support base 16 and the second support base 18 are contacted with loading frame 2 respectively, make track
Car 8 is hanging, starts the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, applies pressure at right angle F on request,
The corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, stops loading；
(4) the first servomotor 3 is started, unloading makes Vertical loading axle 25 leave the top cap of increased pressure board 26, starts first very heavy
The jack 19 of top 15 and second, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make track
Car 8 is contacted with horizontal slide rail 17, and railcar 8 is moved on load sample platform 5, takes out increased pressure board 26, by compound plucking, loads the 3rd
Part compound, increased pressure board 26 is placed on compound, and railcar 8 is moved to immediately below Vertical loading axle 25, starts first very heavy
The jack 19 of top 15 and second, the first support base 16 and the second support base 18 are contacted with loading frame 2 respectively, make track
Car 8 is hanging, starts the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, applies pressure at right angle F on request,
The corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, keeps pressure at right angle F constant；
(5) the first lateral spacing post 24 and the second lateral spacing post 27 are connected with upper shear box 6 respectively, the second lateral spacing post 27 is passed through
Telescopic arm 28 is connected with the 3rd lateral spacing post 29, fixes shear box 6, start the second servomotor 4, make horizontal addload axle 22 with
Connection end 21 is connected, and equi-strain rate on request applies pulling force by transmission rod 20, makes down cut box 7 to the second servo electricity
The direction of machine 4 is moved, and the horizontal direction of shear box 6 is fixed in holding, and upper shear box 6 is vertical sliding by the first vertical slide rail 10 and second
The slide downward of rail 30, makes the output pressure of Vertical loading axle 25 according to F '=F-Ttg30 ° of change, ball axle row 12 extends along lower box
Plate 13 is slided, to avoid the upper box sample 11 inside upper shear box 6 from spilling；
(6) stop experiment when horizontal displacement increases to 75mm, the first servomotor 3 is unloaded by Vertical loading axle 25
Carry, the second servomotor 4 applies thrust by horizontal addload axle 22 and promotes down cut box 7 to move so that upper shear box 6 is cut with
Cut box 7 to overlap, the connection of the lateral spacing post 24 of shear box 6 and first and the second lateral spacing post 27 on removal, start the He of the first jack 15
Second jack 19, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make railcar 8 with
Horizontal slide rail 17 is contacted, and railcar 8 is moved on load sample platform 5 by horizontal slide rail 17, box sample 11 and upper shearing on removal
Box 6, makes that mix surface in down cut box 7 is smooth, and the compound of removal is standby；
(7) geosynthetics is fixed on the surface of down cut box 7, upper shear box 6 be aligned with down cut box 7, again
Load the compound of removal, increased pressure board 26 is placed on compound, railcar 8 is moved to immediately below Vertical loading axle 25, start
First jack 15 and the second jack 19, the first support base 16 and the second support base 18 are connect with loading frame 2 respectively
Touch, make railcar 8 hanging, start the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, apply on request
Pressure at right angle F, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, keeps pressure at right angle F constant；
(8) the first lateral spacing post 24 and the second lateral spacing post 27 are connected with upper shear box 6 respectively, the second lateral spacing post 27 is passed through
Telescopic arm 28 is connected with the 3rd lateral spacing post 29, fixes shear box 6, start the second servomotor 4, make horizontal addload axle 22 with
Connection end 21 is connected, and equi-strain rate on request applies pulling force T by transmission rod 20, makes down cut box 7 to the second servo
The direction of motor 4 is moved, and is fixed while measuring the horizontal direction of shear box 6 in horizontal displacement S, holding using horizontal displacement meter 23, on
Shear box 6 by the first vertical slide rail 10 and the slide downward of the second vertical slide rail 30, make the output pressure of Vertical loading axle 25 according to
F '=F-Ttg30 ° of change, and using the vertical displacement S ' of the measurement increased pressure board 26 of vertical displacement meter 9；
(9) box sample 11 and geosynthetics contact surface in experiment, acquisition are stopped when horizontal displacement S increases to 75mm
Locate+Tsin30 ° of normal pressure f=F ' cos30 °, take f maximum fmax1, obtain fricting shearing at geosynthetics contact surface
Power T '=Tcos30 ° of-F ' sin30 °, take T ' maximum of T 'max1；
(10) unload the first servomotor 3 by Vertical loading axle 25, the second servomotor 4 passes through horizontal addload axle 22
Applying thrust promotes down cut box 7 to move so that upper shear box 6 is overlapped with down cut box 7, the side of shear box 6 and first on removal
The connection of the lateral spacing post 27 of post 24 and second is limited, starts the first jack 15 and the second jack 19, by the He of the first support base 16
Second support base 18 departs from loading frame 2 respectively, railcar 8 is contacted with horizontal slide rail 17, and railcar 8 is passed through into level
Slide rail 17 is moved on load sample platform 5, removal whole compound；
(11) pressure at right angle F value is changed, repeat step (2)-(10) obtain fmax2With T 'max2；
(12) pressure at right angle F value is changed again, repeat step (2)-(10) obtain fmax3With T 'max3；
(13) by fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Pass through upper box sample 11 and geosynthetics
Contact area is converted into stress, draws mole coulomb line, obtains geosynthetics contact surface frictional strength index.
Advantage of the present invention：
The test device that this method is used is simple to manufacture, and measurement accuracy is high, under the conditions of meeting different vertical stress loading
Consolidation and the requirement of oblique scissor test, can carry out strain controlling formula or the loading of Stress Control formula, can measure various geotechnique's synthesis materials
Material includes geotextile, geomembrane, geotextiles, GSZ, geonet, geotechnique's pad, geotechnological special material and geosynthetics material
The frictional strength parameter between geologic body such as material.
The scope of application of the present invention：
The various Rock And Soils run into suitable for civil engineering or Geological Engineering include accumulation body, coarse-grained soil, native stone mixing
Frictional strength attribute testing between a variety of geologic bodies such as body, the soil body and geosynthetics.
Brief description of the drawings：
Fig. 1 is the structural representation for the experimental rig tested for geosynthetics contact surface frictional strength.Wherein have：
Reaction frame 1, loading frame 2, the first servomotor 3, the second servomotor 4, upper shear box 6, down cut box 7, railcar 8 is hung down
Straight displacement meter 9, the first vertical slide rail 10, upper box sample 11, ball axle row 12, lower box expansion board 13, lower box sample the 14, the 1000th
Jin top 15, the first support base 16, horizontal slide rail 17, the second support base 18, the second jack 19, transmission rod 20, connection end
First 21, horizontal addload axle 22, horizontal displacement meter 23, the first lateral spacing post 24, Vertical loading axle 25, increased pressure board 26, the second lateral spacing post
27, telescopic arm 28, the 3rd lateral spacing post 29, the second vertical slide rail 30.
Fig. 2 is the AA left views of the structural representation for the experimental rig tested for geosynthetics contact surface frictional strength
Figure.Wherein have：First servomotor 3, load sample platform 5, upper shear box 6, down cut box 7, railcar 8, upper box sample 11, lower box examination
Sample 14, increased pressure board 26.
Fig. 3 be for geosynthetics contact surface frictional strength test experimental rig structural representation on cut
Cut the top view of box 6.Wherein there is upper shear box 6.
Fig. 4 be for geosynthetics contact surface frictional strength test experimental rig structural representation under cut
Cut the top view of box 7.Wherein there are down cut box 7, lower box expansion board 13.
Embodiment：
Embodiment：Geosynthetics contact surface frictional strength method of testing is as follows,
1. according to water content 15%, rock-soil ratio 20% and density 1.9g/cm3It is required that, weigh the soil body, the rubble of respective quality
And water, the soil body, rubble, water three are well mixed, as compound, be divided into uniform three parts it is standby；
2. railcar 8 is moved on load sample platform 5, upper shear box 6 is alignd down cut boxes 7 via ball axle row 12, by the
A compound is fitted into down cut box 7, and increased pressure board 26 is placed on compound, and railcar 8 is being moved into Vertical loading axle 25 just
Lower section, starts the first jack 15 and the second jack 19, by the first support base 16 and the second support base 18 respectively with adding
Carry framework 2 to contact, make railcar 8 hanging, start the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, press
It is required that applying pressure at right angle F=400kN, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement stops adding
Carry；
3. the first servomotor 3 is started, unloading makes Vertical loading axle 25 leave the top cap of increased pressure board 26, starts the first jack
15 and second jack 19, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make railcar
8 are contacted with horizontal slide rail 17, and railcar 8 is moved on load sample platform 5, take out increased pressure board 26, by compound plucking, load second part
Compound, increased pressure board 26 is placed on compound, and railcar 8 is moved to immediately below Vertical loading axle 25, starts the first jack
15 and second jack 19, the first support base 16 and the second support base 18 are contacted with loading frame 2 respectively, make railcar
8 is hanging, starts the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, applies pressure at right angle F=on request
400kN, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, stops loading；
4. the first servomotor 3 is started, unloading makes Vertical loading axle 25 leave the top cap of increased pressure board 26, starts the first jack
15 and second jack 19, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make railcar
8 are contacted with horizontal slide rail 17, and railcar 8 is moved on load sample platform 5, take out increased pressure board 26, by compound plucking, load the 3rd part
Compound, increased pressure board 26 is placed on compound, and railcar 8 is moved to immediately below Vertical loading axle 25, starts the first jack
15 and second jack 19, the first support base 16 and the second support base 18 are contacted with loading frame 2 respectively, make railcar
8 is hanging, starts the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, applies pressure at right angle F=on request
400kN, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, keeps pressure at right angle F=400kN constant；
5. the first lateral spacing post 24 and the second lateral spacing post 27 are connected with upper shear box 6 respectively, the second lateral spacing post 27 is passed through
Telescopic arm 28 is connected with the 3rd lateral spacing post 29, fixes shear box 6, start the second servomotor 4, make horizontal addload axle 22 with
Connection end 21 is connected, and equi-strain rate 2mm/min on request applies pulling force by transmission rod 20, makes down cut box 7 to the
The direction of two servomotor 4 is moved, and the horizontal direction of shear box 6 is fixed in holding, and upper shear box 6 passes through the first vertical slide rail 10 and the
The slide downward of two vertical slide rail 30, makes the output pressure of Vertical loading axle 25 according to F '=F-Ttg30 ° of change, ball axle arranges 12 edges
Lower box expansion board 13 is slided, to avoid the upper box sample 11 inside upper shear box 6 from spilling；
6. stop experiment when horizontal displacement increases to 75mm, the first servomotor 3 unloaded by Vertical loading axle 25,
Second servomotor 4 applies thrust by horizontal addload axle 22 and promotes down cut box 7 to move so that upper shear box 6 and down cut
Box 7 is overlapped, the connection of the lateral spacing post 24 of shear box 6 and first and the second lateral spacing post 27 on removal, starts the first jack 15 and the
Two jack 19, the first support base 16 and the second support base 18 are departed from loading frame 2 respectively, make railcar 8 and water
Smooth rail 17 is contacted, and railcar 8 is moved on load sample platform 5 by horizontal slide rail 17, box sample 11 and upper shear box on removal
6, make that mix surface in down cut box 7 is smooth, the compound of removal is standby；
7. geosynthetics is fixed on the surface of down cut box 7, upper shear box 6 is aligned with down cut box 7, filled again
Enter the compound of removal, increased pressure board 26 is placed on compound, railcar 8 is moved to immediately below Vertical loading axle 25, start the
One jack 15 and the second jack 19, the first support base 16 and the second support base 18 are contacted with loading frame 2 respectively,
Make railcar 8 hanging, start the first servomotor 3, Vertical loading axle 25 is contacted the top cap of increased pressure board 26, apply vertical on request
Pressure F=400kN, the corresponding shift value when display of vertical displacement meter 9 reaches the density of requirement, keeps pressure at right angle F=
400kN is constant；
8. the first lateral spacing post 24 and the second lateral spacing post 27 are connected with upper shear box 6 respectively, the second lateral spacing post 27 is passed through
Telescopic arm 28 is connected with the 3rd lateral spacing post 29, fixes shear box 6, start the second servomotor 4, make horizontal addload axle 22 with
Connection end 21 is connected, and equi-strain rate 2mm/min on request applies pulling force T by transmission rod 20, makes down cut box 7 to the
The direction of two servomotor 4 is moved, and is consolidated while measuring the horizontal direction of shear box 6 in horizontal displacement S, holding using horizontal displacement meter 23
Fixed, upper shear box 6 makes the output pressure of Vertical loading axle 25 by the first vertical slide rail 10 and the slide downward of the second vertical slide rail 30
According to F '=F-Ttg30 ° of change, and using the vertical displacement S ' of the measurement increased pressure board 26 of vertical displacement meter 9；
9. box sample 11 and geosynthetics contact surface in experiment, acquisition are stopped when horizontal displacement S increases to 75mm
Locate+Tsin30 ° of normal pressure f=F ' cos30 °, take f maximum fmax1, obtain fricting shearing at geosynthetics contact surface
Power T '=Tcos30 ° of-F ' sin30 °, take T ' maximum of T 'max1；
10. unload the first servomotor 3 by Vertical loading axle 25, the second servomotor 4 is applied by horizontal addload axle 22
Plus thrust promotes down cut box 7 to move so that upper shear box 6 is overlapped with down cut box 7, the lateral spacing of shear box 6 and first on removal
The connection of the lateral spacing post 27 of post 24 and second, starts the first jack 15 and the second jack 19, by the first support base 16 and the
Two support bases 18 depart from loading frame 2 respectively, railcar 8 is contacted with horizontal slide rail 17, and railcar 8 is slided by level
Rail 17 is moved on load sample platform 5, removal whole compound；
Change pressure at right angle be F=600kN, repeat step 2. -10., obtain fmax2With T 'max2；
Again change pressure at right angle be F=800kN, repeat step 2. -10., obtain fmax3With T 'max3；
By fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Pass through connecing for upper box sample 11 and geosynthetics
Contacting surface product is converted into stress, draws mole coulomb line, obtains geosynthetics contact surface frictional strength index.
Claims (1)
1. a kind of geosynthetics contact surface frictional strength method of testing, it is characterized in that carrying out geotechnique using a kind of experimental rig
Synthetic material contact surface frictional strength is tested, and the device includes reaction frame (1), loading frame (2), the first servomotor (3), the
Two servomotors (4), load sample platform (5), upper shear box (6), down cut box (7), railcar (8), vertical displacement meter (9), first
Vertical slide rail (10), upper box sample (11), ball axle row (12), lower box expansion board (13), lower box sample (14), the first jack
(15), the first support base (16), horizontal slide rail (17), the second support base (18), the second jack (19), transmission rod
(20), connection end (21), horizontal addload axle (22), horizontal displacement meter (23), the first lateral spacing post (24), Vertical loading axle
(25), increased pressure board (26), the second lateral spacing post (27), telescopic arm (28), the 3rd lateral spacing post (29), the second vertical slide rail (30)；The
One servomotor (3) connection Vertical loading axle (25), Vertical loading axle (25) provides pressure at right angle, on increased pressure board (26)
Face, increased pressure board (26) connection vertical displacement meter (9), increased pressure board (26) be located at upper box sample (11) top surface, upper shear box (6) by
First lateral spacing post (24) and the second lateral spacing post (27) are fixed, and the first lateral spacing post (24) connects the first vertical slide rail (10), the second side
Limit post (27) is connected by telescopic arm (28) with the 3rd lateral spacing post (29), and the 3rd lateral spacing post (29) connects the second vertical slide rail
(30), upper shear box (6) is aligned in down cut box (7), upper shear box (6) by ball axle row (12) and installs box sample
(11) lower box sample (14), down cut box (7) connection lower box expansion board (13), down cut box (7), are installed in down cut box (7)
Railcar (8) is connected, railcar (8) can be moved on load sample platform (5) along horizontal slide rail (17), horizontal slide rail (17) and loading
Framework (2) is connected, and the first jack (15) connects the first support base (16), and the second jack (19) connects the second support base
(18), down cut box (7) connection transmission rod (20) and horizontal displacement meter (23), connection end (21) and horizontal addload axle (22) are right
Standard, horizontal addload axle (22) connects the second servomotor (4)；Upper shear box (6) size is the wide 500mm of long 500mm, connection first
The a height of 445mm of box wall of the upper shear box (6) of lateral spacing post (24) side, connects the upper shear box of second lateral spacing post (27) side
(6) a height of 155mm of box wall, down cut box (7) size is the wide 500mm of long 500mm, under connection under box expansion board (13) side
The a height of 155mm of box wall of shear box (7), connects a height of 445mm of box wall of the down cut box (7) of transmission rod (20) side, ball
Axle row (12) inclination angle is 30 °, and upper shear box (6) and down cut box (7) are using the high alloy material of light weight intensity, and carry out
Four angles of inwall of anodization preservative treatment, upper shear box (6) and down cut box (7) are circular design, and radius of corner is
30mm~60mm, upper shear box (6) can be slided along lower box expansion board (13), and the first lateral spacing post (24) can be vertical sliding along first
Rail (10) vertical sliding motion, the 3rd lateral spacing post (29) can along the second vertical slide rail (30) vertical sliding motion, the first servomotor (3) and
Second servomotor (4) is used by reaction frame (1) applying power, reaction frame (1) and loading frame (2) and increased pressure board (26)
High-strength stainless steel material, gap length between increased pressure board (26) and upper shear box (6) is 2mm~4mm, ball axle row (12),
Lower box expansion board (13) and horizontal slide rail (17) are high-strength stainless steel material, and surface scribbles teflon；First
Servomotor (3) and the second servomotor (4) can carry out fast forwarding and fast rewinding operation, can also carry out at the uniform velocity strain loading and answer
Power is loaded, and strain shear rate is 0.02~5.00mm/min, and EIAJ is up to 1000kN, and measurement accuracy of exerting oneself is reachable
0.5%FS, stress shear rate is 100~600kN/min；The maximum range of vertical displacement meter (9) is 150mm, measurement accuracy
Up to 1mm, the maximum range of horizontal displacement meter (23) is 170mm, measurement accuracy up to 1mm,
The method for carrying out the test of geosynthetics contact surface frictional strength using the device is as follows：
1. according to certain water content, rock-soil ratio and density requirements, the soil body, rubble and water of respective quality are weighed, by the soil body, broken
Stone, water three be well mixed, as compound, be divided into uniform three parts it is standby；
2. railcar (8) is moved on load sample platform (5), by upper shear box (6) via ball axle row (12) alignment down cut box
(7), first part of compound is fitted into down cut box (7), increased pressure board (26) is placed on compound, railcar (8) is moved to
Immediately below Vertical loading axle (25), start the first jack (15) and the second jack (19), by the first support base (16) and
Second support base (18) is contacted with loading frame (2) respectively, makes railcar (8) vacantly, is started the first servomotor (3), is made
Vertical loading axle (25) contacts increased pressure board (26) top cap, applies pressure at right angle F on request, treats that vertical displacement meter (9) display reaches
It is required that density when corresponding shift value, stop loading；
3. the first servomotor (3) is started, unloading makes Vertical loading axle (25) leave increased pressure board (26) top cap, starts first very heavy
(15) and the second jack (19) are pushed up, by the first support base 16) and the second support base (18) taken off respectively with loading frame (2)
From, railcar (8) is contacted with horizontal slide rail (17), railcar (8) is moved on load sample platform (5), take out increased pressure board (26), will
Compound plucking, loads second part of compound, increased pressure board (26) is placed on compound, railcar (8) is moved into Vertical loading
Immediately below axle (25), start the first jack (15) and the second jack (19), the first support base (16) and second are supported
Base (18) is contacted with loading frame (2) respectively, makes railcar (8) vacantly, is started the first servomotor (3), is made Vertical loading
Axle (25) contacts increased pressure board (26) top cap, applies pressure at right angle F on request, treats that vertical displacement meter (9) display reaches the close of requirement
Corresponding shift value when spending, stops loading；
4. the first servomotor (3) is started, unloading makes Vertical loading axle (25) leave increased pressure board (26) top cap, starts first very heavy
Push up (15) and the second jack (19), by the first support base (16) and the second support base (18) respectively with loading frame (2)
Depart from, railcar (8) is contacted with horizontal slide rail (17), railcar (8) is moved on load sample platform (5), take out increased pressure board (26),
By compound plucking, load the 3rd part of compound, increased pressure board (26) is placed on compound, railcar (8) is moved into vertical add
Carry immediately below axle (25), start the first jack (15) and the second jack (19), by the first support base (16) and second
Support base (18) is contacted with loading frame (2) respectively, is made railcar (8) vacantly, is started the first servomotor (3), makes vertical add
Axle (25) contact increased pressure board (26) top cap is carried, applies pressure at right angle F on request, treats that vertical displacement meter (9) display reaches requirement
Corresponding shift value during density, keeps pressure at right angle F constant；
5. the first lateral spacing post (24) and the second lateral spacing post (27) are connected with upper shear box (6) respectively, by the second lateral spacing post (27)
It is connected by telescopic arm (28) with the 3rd lateral spacing post (29), makes shear box (6) fixed, is started the second servomotor (4), make water
Flat loading axis (22) is connected with connection end (21), and equi-strain rate on request applies pulling force by transmission rod (20), under making
Shear box (7) is moved to the second servomotor (4) direction, and shear box (6) horizontal direction is fixed in holding, and upper shear box (6) is led to
Cross the first vertical slide rail (10) and the second vertical slide rail (30) slide downward, make Vertical loading axle (25) output pressure according to F '=
F-Ttg30 ° of change, ball axle row (12) slides along lower box expansion board (13), to avoid the upper box sample that upper shear box (6) is internal
(11) spill；
6. stop experiment when horizontal displacement increases to 75mm, the first servomotor (3) unloaded by Vertical loading axle (25),
Second servomotor (4) applies thrust by horizontal addload axle (22) and promotes down cut box (7) mobile so that upper shear box (6)
Overlapped with down cut box (7), the connection of shear box (6) and the first lateral spacing post (24) and the second lateral spacing post (27) on removal starts
First jack (15) and the second jack (19), by the first support base (16) and the second support base (18) respectively with loading
Framework (2) departs from, and railcar (8) is contacted with horizontal slide rail (17), railcar (8) is moved into load by horizontal slide rail (17)
On sample platform (5), box sample (11) and upper shear box (6), make down cut box (7) interior mix surface smooth on removal, removal
Compound is standby；
7. geosynthetics is fixed on down cut box (7) surface, upper shear box (6) be aligned with down cut box (7), again
Load the compound of removal, increased pressure board (26) is placed on compound, under railcar (8) is moved into Vertical loading axle (25) just
Side, starts the first jack (15) and the second jack (19), by the first support base (16) and the second support base (18) point
Do not contacted with loading frame (2), make railcar (8) vacantly, start the first servomotor (3), contact Vertical loading axle (25)
Increased pressure board (26) top cap, applies pressure at right angle F on request, corresponding when vertical displacement meter (9) display reaches the density of requirement
Shift value, keeps pressure at right angle F constant；
8. the first lateral spacing post (24) and the second lateral spacing post (27) are connected with upper shear box (6) respectively, by the second lateral spacing post (27)
It is connected by telescopic arm (28) with the 3rd lateral spacing post (29), makes shear box (6) fixed, is started the second servomotor (4), make water
Flat loading axis (22) is connected with connection end (21), and equi-strain rate on request applies pulling force T by transmission rod (20), under making
Shear box (7) is moved to the second servomotor (4) direction, while being measured using horizontal displacement meter (23) in horizontal displacement S, holding
Shear box (6) horizontal direction is fixed, and upper shear box (6) is by the first vertical slide rail (10) and the second vertical slide rail (30) to downslide
It is dynamic, make Vertical loading axle (25) output pressure according to F '=F-Ttg30 ° of change, and using vertical displacement meter (9) measurement increased pressure board
(26) vertical displacement S '；
9. experiment is stopped when horizontal displacement S increases to 75mm, in acquisitions at box sample (11) and geosynthetics contact surface
+ Tsin30 ° of normal pressure f=F ' cos30 °, take f maximum fmax1, obtain frictional shearing at geosynthetics contact surface
T '=Tcos30 ° of-F ' sin30 °, take T ' maximum of T 'max1；
10. unload the first servomotor (3) by Vertical loading axle (25), the second servomotor (4) passes through horizontal addload axle
(22) applying thrust promotes down cut box (7) mobile so that upper shear box (6) is overlapped with down cut box (7), shear box on removal
(6) with the connection of the first lateral spacing post (24) and the second lateral spacing post (27), the first jack (15) and the second jack (19) are started,
First support base (16) and the second support base (18) are departed from loading frame (2) respectively, railcar (8) is slided with level
Rail (17) is contacted, and railcar (8) is moved on load sample platform (5) by horizontal slide rail (17), removal whole compound；
Change pressure at right angle F value, repeat step 2. -10., obtain fmax2With T 'max2；
Change pressure at right angle F value again, repeat step 2. -10., obtain fmax3With T 'max3；
By fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Contact by upper box sample (11) with geosynthetics
Area is converted into stress, draws mole coulomb line, obtains geosynthetics contact surface frictional strength index.
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| CN110186816B (en) * | 2019-05-16 | 2024-02-27 | 中国地质大学（武汉） | Test device for testing microscopic dynamics characteristics of granular materials |
| CN110146441B (en) * | 2019-06-14 | 2021-07-27 | 辽宁工程技术大学 | Test device for measuring dynamic friction coefficient of concrete structure and soil body |
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| CN103383327A (en) * | 2013-06-28 | 2013-11-06 | 中南大学 | Large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests |
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| CN104713788A (en) * | 2015-03-30 | 2015-06-17 | 西安长庆科技工程有限责任公司 | Strain-control type tension-shearing direct shear apparatus |
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| CN102095650A (en) * | 2011-01-21 | 2011-06-15 | 中国科学院地质与地球物理研究所 | Method for testing strength of soil-rock mixture |
| CN102323166A (en) * | 2011-08-19 | 2012-01-18 | 河海大学 | Cascade circular inclined plane shearing apparatus |
| CN103383327A (en) * | 2013-06-28 | 2013-11-06 | 中南大学 | Large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests |
| CN104034607A (en) * | 2014-06-04 | 2014-09-10 | 同济大学 | Large-sized multifunctional geosynthetic material interface power direct shear apparatus |
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