CN104990809B - One kind landslide base clad can repeated direct shear test method - Google Patents
One kind landslide base clad can repeated direct shear test method Download PDFInfo
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Abstract
One kind landslide base clad can repeated direct shear test method, it is characterized in that carrying out landslide base clad can residual 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), ball axle arranges (12), lower box sample (14), transmission rod (20), Vertical loading axle (25) etc..By considering the oblique scissor test requirement of base clad can shape, cementation, hydraulic characteristic under different vertical load action, the direct stress and shear stress on oblique section are obtained, so as to obtain large scale soil-rock mixture landslide base clad can residual shear strength parameter.This method can be used for the various Rock And Soils run into civil engineering or Geological Engineering to include consolidation characteristics, residual strength attribute testing in a variety of geologic body rooms such as accumulation body, coarse-grained soil, soil-rock mixture, the soil body.
Description
Technical field
The present invention is a kind of geotechnical testament method, belongs to civil engineering or Geological Engineering testing field.
Background technology
Soil-rock mixture (gravelly soil, coarse-grained soil) is a kind of gravel by as aggregate or block stone and gluing as casting resin
The geologic body that soil and sand are constituted.Soil-rock mixture is widely used in earth and rockfill dam, highway, railway, airport, room as a kind of filler
The architectural engineerings such as room ground, application is quite extensive.Due to soil-rock mixture by block stone and local soil type into and both are in mechanical property
" extremely strong " (block stone) and " extremely weak " (soil body) two extreme othernesses are presented in matter.This otherness makes soil-rock mixture in thing
Extreme inhomogeneities and extreme nonlinear characteristic is presented in reason mechanical property, its Macroscopic physical mechanical property can not be by block stone
Or native simple superposition is formed.Soil-rock mixture landslide often occurs along rock base clad can, therefore between soil-rock mixture and base clad can
Interaction influenceed by the occurrence of base clad can, shape, cementation, hydraulic characteristic etc., for soil-rock mixture base clad can power
Learning the test of intensity can not be completed to mix, it is necessary to develop and be adapted to native stone by traditional soil mechanics shear or rock test rig
The new instrument of fit own characteristic, measures its mechanical strength, in particular for landslide stability evaluation, it is necessary to consider that native stone is mixed
The influence of frictional strength between fit and slope bedrock surface, especially its residual strength characteristic.The present invention is exactly a kind of for measuring
The test method of landslide base clad can direct shear strength repeatedly is surveyed, it is residual between large scale soil-rock mixture and landslide bedrock surface for testing
Remaining shear strength parameter.
The content of the invention
It is an object of the present invention to provide one kind landslide base clad can repeated direct shear test method, for solving soil-rock mixture
Landslide considers base clad can shape, cementation, the strength test of hydraulic characteristic under different consolidation stress environment, is that side slope is steady
Qualitative analysis provides technical parameter
The technical solution of the present invention, it is characterized in that using a kind of experimental rig, carrying out landslide base clad can staight scissors repeatedly
Intensive parameter is obtained, and the experimental rig includes 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, 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, above increased pressure board 26, increased pressure board
26 connection vertical displacement meters 9, increased pressure board 26 is located at the top surface of upper box sample 11, and upper shear box 6 is by the first lateral spacing post 24 and 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 the side of telescopic arm 28 and the 3rd
Limit post 29 to be connected, the 3rd lateral spacing post 29 connects the second vertical slide rail 30, upper shear box 6 is directed at down cut box by ball axle row 12
7, install in upper shear box 6 and lower box sample 14 is installed in box sample 11, down cut box 7, the lower box expansion board of the connection of down cut box 7
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, and horizontal slide rail 17 is with adding
Carry framework 2 to connect, the first jack 15 connects the first support base 16, the second jack 19 connects the second support base 18, under
Shear box 7 connects transmission rod 20 and horizontal displacement meter 23, and connection end 21 is aligned with horizontal addload axle 22, and horizontal addload axle 22 connects
Connect the second servomotor 4.The upper size of shear box 6 is the wide 500mm of long 500mm, the upper shear box 6 of connection the first lateral spacing post 24 side
The a height of 445mm of box wall, a height of 155mm of box wall of the upper shear box 6 of connection the second lateral spacing post 27 side, the size of down cut box 7
For the wide 500mm of long 500mm, a height of 155mm of box wall of the down cut box 7 of the lower side of box expansion board 13 of connection, transmission rod 20 is connected
The a height of 445mm of box wall of the down cut box 7 of side, it is 30 ° that ball axle, which arranges 12 inclination angles, and upper shear box 6 and down cut box 7 are used
The high alloy material of light weight intensity, and carry out anodization preservative treatment, the inwall four of upper shear box 6 and down cut box 7
Angle is circular design, and radius of corner is 30mm~60mm, and upper shear box 6 can be slided along lower box expansion board 13, the first lateral spacing post
24 can be along the vertical sliding motion of the second vertical slide rail 30, first along the vertical sliding motion of the first vertical slide rail 10, the 3rd lateral spacing post 29
The servomotor 4 of servomotor 3 and second is adopted by the applying power of reaction frame 1, reaction frame 1 and loading frame 2 and increased pressure board 26
With high-strength stainless steel material, the 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
Fast forwarding and fast rewinding operation can be carried out with the second servomotor 4, at the uniform velocity strain loading and stress loading can also be carried out, strain is cut
Cutting speed rate is 0.02~5.00mm/min, and EIAJ is up to 1000kN, and measurement accuracy of exerting oneself is up to 0.5%FS, stress shearing
Speed is 100~600kN/min.The maximum range of vertical displacement meter 9 is 150mm, and measurement accuracy is up to 1mm, horizontal displacement meter
23 maximum range is 170mm, and measurement accuracy is up to 1mm.Lower box sample 14 is the cast material for simulating base clad can, can be with
Concrete material, gypsum material, cement material and clay material are chosen, the lower top layer shape of box sample 14 can be fabricated to straight
Shape, zigzag and wavy, the lower top layer of box sample 14 can select saturation state, unsaturated state and drying regime.
The method for carrying out landslide base clad can repeated direct shear test 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 are well mixed, standby as compound；
(2) railcar 8 is moved on load sample platform 5, lower box sample 14 is placed in down cut box 7, by upper shear box 6 via
The alignment down cut box 7 of ball axle row 12, compound is fitted into shear box 6, increased pressure board 26 is placed on compound, by track
Car 8 is moved to immediately below Vertical loading axle 25, starts the first jack 15 and the second jack 19, by the first support base 16 and the
Two support bases 18 are contacted with loading frame 2 respectively, are made railcar 8 hanging, are started the first servomotor 3, make Vertical loading axle
The 25 contact top caps of increased pressure board 26, apply pressure at right angle F on request, the correspondence when display of vertical displacement meter 9 reaches the density of requirement
Shift value, keep pressure at right angle F constant；
(3) 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, ball axle row 12 expands along lower box
Panel 13 is slided, to avoid the upper box sample 11 inside upper shear box 6 from spilling；
(4) stop experiment when horizontal displacement S 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, start the second servomotor 4, equi-strain rate on request applies pulling force T by transmission rod 20, makes down cut
Box 7 is moved to the direction of the second servomotor 4, while measuring the water of shear box 6 in horizontal displacement S, holding using horizontal displacement meter 23
Square to fixation, upper shear box 6 makes Vertical loading axle 25 by the first vertical slide rail 10 and the slide downward of the second vertical slide rail 30
Output pressure uses the vertical displacement S ' of the measurement increased pressure board 26 of vertical displacement meter 9 according to F '=F-Ttg30 ° of change；
(5) repeat step (4) so that after upper box sample 11 is completed the 5th time with the shearing of lower box sample 14, box is tried in acquisition
Sample 11 and+Tsin30 ° of normal pressure f=F ' cos30 ° at the lower contact surface of box sample 14, take f maximum fmax1, obtain contact surface
Locate shearing force T '=Tcos30 ° of-F ' sin30 °, take T ' maximum of T 'max1,
(6) 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；
(7) pressure at right angle F value is changed, repeat step (2)-(6) obtain fmax2With T 'max2；
(8) pressure at right angle F value is changed again, repeat step (2)-(6) obtain fmax3With T 'max3；
(9) by fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Pass through connecing for upper box sample 11 and lower box sample 14
Contacting surface product is converted into stress, draws mole coulomb line, obtains landslide base clad can direct shear strength index repeatedly.
Advantage of the present invention：
The test device that this method is used is simple to manufacture, and measurement accuracy is high, is met and is examined under the conditions of different vertical stress loading
Consider the oblique scissor test requirement of base clad can shape, cementation, hydraulic characteristic, strain controlling formula can be carried out or Stress Control formula adds
Carry, large scale soil-rock mixture landslide base clad can residual shear strength parameter can be measured.
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
Consolidation characteristics, residual strength attribute testing etc. in a variety of geologic body rooms such as body, the soil body.
Brief description of the drawings：
Fig. 1 is the structural representation for measuring the landslide base clad can experimental rig of direct shear strength repeatedly.Wherein have：Counter-force
Frame 1, loading frame 2, the first servomotor 3, the second servomotor 4, upper shear box 6, down cut box 7, railcar 8, vertical position
Move meter 9, the 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 is stretched
Contracting arm 28, the 3rd lateral spacing post 29, the second vertical slide rail 30.
Fig. 2 is the AA left views for measuring the landslide base clad can structural representation of the experimental rig of direct shear strength repeatedly.
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 sample
14, increased pressure board 26.
Fig. 3 is for the upper shear box in measurement landslide base the clad can repeatedly structural representation of the experimental rig of direct shear strength
6 top view.Wherein there is upper shear box 6.
Fig. 4 is the down cut box 7 for measuring landslide base clad can repeatedly in the structural representation of the experimental rig of direct shear strength
Top view.Wherein there are down cut box 7, lower box expansion board 13.
Embodiment：
Embodiment：The base clad can repeated direct shear test method that comes down is as follows,
1. according to 15% water content, 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, it is standby as compound；
2. railcar 8 is moved on load sample platform 5, lower box sample 14 is placed in down cut box 7, by upper shear box 6 via
The alignment down cut box 7 of ball axle row 12, compound is fitted into shear box 6, increased pressure board 26 is placed on compound, by track
Car 8 is moved to immediately below Vertical loading axle 25, starts the first jack 15 and the second jack 19, by the first support base 16 and the
Two support bases 18 are contacted with loading frame 2 respectively, are made railcar 8 hanging, are started the first servomotor 3, make Vertical loading axle
The 25 contact top caps of increased pressure board 26, apply pressure at right angle F=400kN on request, treat that vertical displacement meter 9 shows the density for reaching requirement
When corresponding shift value, keep pressure at right angle F=400kN constant；
3. 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, ball axle row 12 is under
Box expansion board 13 is slided, to avoid the upper box sample 11 inside upper shear box 6 from spilling；
4. stop experiment when horizontal displacement S 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, start the second servomotor 4, equi-strain rate 2mm/min on request applies pulling force T by transmission rod 20, makes
Down cut box 7 is moved to the direction of the second servomotor 4, is sheared while being measured using horizontal displacement meter 23 in horizontal displacement S, holding
The horizontal direction of box 6 is fixed, and upper shear box 6 makes vertical add by the first vertical slide rail 10 and the slide downward of the second vertical slide rail 30
The output pressure of axle 25 is carried 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；
5. repeat step is 4. so that after upper box sample 11 is completed the 5th time with the shearing of lower box sample 14, box sample in acquisition
11 with the lower contact surface of box sample 14 at+Tsin30 ° of normal pressure f=F ' cos30 °, take f maximum fmax1, obtain at contact surface
Shearing force T '=Tcos30 ° of-F ' sin30 °, take T ' maximum of T 'max1,
6. 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；
7. change pressure at right angle be F=600kN, repeat step 2. -6., obtain fmax2With T 'max2；
8. again change pressure at right angle be F=800kN, repeat step 2. -6., obtain fmax3With T 'max3；
9. by fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Pass through contact of the upper box sample 11 with lower box sample 14
Area is converted into stress, draws mole coulomb line, obtains landslide base clad can direct shear strength index repeatedly.
Claims (1)
1. one kind landslide base clad can repeated direct shear test method, covers it is characterized in that carrying out landslide base using a kind of experimental rig
Face repeated direct shear test, the device includes reaction frame (1), loading frame (2), the first servomotor (3), the second servo electricity
Machine (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), ball axle row (12), lower box expansion board (13), lower box sample (14), the first jack (15), the
One support base (16), horizontal slide rail (17), the second support base (18), the second jack (19), transmission rod (20), connection end
Head (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)；First servomotor
(3) connection Vertical loading axle (25), Vertical loading axle (25) provides pressure at right angle, increased pressure board positioned at increased pressure board (26) above
(26) connection vertical displacement meter (9), increased pressure board (26) is located at the top surface of upper box sample (11), and upper shear box (6) is by the 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 lateral spacing post (27)
It is connected by telescopic arm (28) with the 3rd lateral spacing post (29), the 3rd lateral spacing post (29) connects the second vertical slide rail (30), upper shearing
Box (6) is aligned in down cut box (7), upper shear box (6) by ball axle row (12) and installs box sample (11), down cut box
(7) box sample (14) under being installed in, the lower box expansion board (13) of down cut box (7) connection, down cut box (7) connection railcar (8),
Railcar (8) can be moved on load sample platform (5) along horizontal slide rail (17), and horizontal slide rail (17) is connected with loading frame (2), the
One 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) are aligned with horizontal addload axle (22), horizontal addload axle
(22) the second servomotor of connection (4)；Upper shear box (6) size is the wide 500mm of long 500mm, connects the first lateral spacing post (24) one
The a height of 445mm of box wall of the upper shear box (6) of side, the box wall for connecting the upper shear box (6) of second lateral spacing post (27) side is a height of
155mm, down cut box (7) size is the wide 500mm of long 500mm, the box of the down cut box (7) of lower box expansion board (13) side of connection
The a height of 155mm of wall, connects a height of 445mm of box wall of the down cut box (7) of transmission rod (20) side, and ball axle row (12) inclination angle is
30 °, upper shear box (6) and down cut box (7) are using the high alloy material of light weight intensity, and carry out at anodization anti-corrosion
Four angles of inwall of reason, upper shear box (6) and down cut box (7) are circular design, and radius of corner is 30mm~60mm, upper shearing
Box (6) can be slided along lower box expansion board (13), the first lateral spacing post (24) can along the first vertical slide rail (10) vertical sliding motion,
Three lateral spacing posts (29) can be along the second vertical slide rail (30) vertical sliding motion, and the first servomotor (3) and the second servomotor (4) are logical
Reaction frame (1) applying power is crossed, reaction frame (1) and loading frame (2) and increased pressure board (26) use 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 water
Smooth rail (17) is high-strength stainless steel material, and surface scribbles teflon；First servomotor (3) and second is watched
Fast forwarding and fast rewinding operation can be carried out by taking motor (4), can also carry out at the uniform velocity strain loading and stress loading, strain shear rate
For 0.02~5.00mm/min, EIAJ is up to 1000kN, and measurement accuracy of exerting oneself is up to 0.5%FS, stress shear rate
100~600kN/min；The maximum range of vertical displacement meter (9) is 150mm, and measurement accuracy is up to 1mm, horizontal displacement meter (23)
Maximum range be 170mm, measurement accuracy is up to 1mm, and lower box sample (14) is the cast material for simulating base clad can, choose
Concrete material, gypsum material, cement material or clay material, lower box sample (14) top layer shape are fabricated to flat, sawtooth
Shape is wavy, lower box sample (14) top layer be saturation state, unsaturated state or drying regime,
The method for carrying out landslide base clad can repeated direct shear test 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 are well mixed, standby as compound；
2. railcar (8) is moved on load sample platform (5), lower box sample (14) is placed in down cut box (7), by upper shear box
(6) via ball axle row (12) alignment down cut box (7), compound is fitted into shear box (6), increased pressure board (26) is placed in
On compound, railcar (8) is moved to immediately below Vertical loading axle (25), starts the first 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, railcar (8) is hanged
Sky, starts the first servomotor (3), Vertical loading axle (25) is contacted increased pressure board (26) top cap, applies pressure at right angle on request
F, corresponding shift value when vertical displacement meter (9) display reaches the density of requirement, keeps pressure at right angle F constant；
3. 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 ', ball axle row (12) slides along lower box expansion board (13), to avoid the upper box that upper shear box (6) is internal
Sample (11) is spilt；
4. stop experiment when horizontal displacement S 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) mobile so that upper shear box
(6) overlapped with down cut box (7), start the second servomotor (4), equi-strain rate on request is applied by transmission rod (20)
Pulling force T, makes down cut box (7) be moved to the second servomotor (4) direction, while measuring horizontal position using horizontal displacement meter (23)
Move shear box (6) horizontal direction in S, holding to fix, upper shear box (6) passes through the first vertical slide rail (10) and the second vertical slide rail
(30) slide downward, makes Vertical loading axle (25) output pressure according to F '=F-Ttg30 ° of change, and use vertical displacement meter
(9) the vertical displacement S ' of measurement increased pressure board (26)；
5. repeat step is 4. so that after upper box sample (11) is completed the 5th time with the shearing of lower box sample (14), box sample in acquisition
(11) with+Tsin30 ° of normal pressure f=F ' cos30 ° at lower box sample (14) contact surface, f maximum f is takenmax1, contacted
Shearing force T '=Tcos30 ° of-F ' sin30 ° at face, take T ' maximum of T 'max1,
6. 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；
7. change pressure at right angle F value, repeat step 2. -6., obtain fmax2With T 'max2；
8. change pressure at right angle F value again, repeat step 2. -6., obtain fmax3With T 'max3；
9. by fmax1With T 'max1、fmax2With T 'max2、fmax3With T 'max3Pass through contact of the upper box sample (11) with lower box sample (14)
Area is converted into stress, draws mole coulomb line, obtains landslide base clad can direct shear strength index repeatedly.
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| CN105954497B (en) * | 2016-06-22 | 2018-07-06 | 西安科技大学 | A kind of Soft Soil Layer landslide disaster simulation experiment method |
| CN106198256B (en) * | 2016-06-22 | 2018-05-01 | 西安科技大学 | A kind of soil body shear band expansion process observation procedure |
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| CN110634374B (en) * | 2019-08-27 | 2021-03-26 | 中国地质大学（武汉） | Physical model experiment device for simulating deformation and damage process of building on landslide |
| CN112683695B (en) * | 2021-01-06 | 2023-06-30 | 四川农业大学 | Simple direct shearing device for root soil complex and use method |
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| JPH1164202A (en) * | 1997-08-21 | 1999-03-05 | Fujita Corp | Method and device for testing shear strength |
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| CN102323166A (en) * | 2011-08-19 | 2012-01-18 | 河海大学 | Cascade circular inclined plane shearing apparatus |
| CN103175742B (en) * | 2013-03-06 | 2016-04-27 | 北京交通大学 | A kind of frozen soil dynamic loading direct shear 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 |
| CN103792133B (en) * | 2014-03-05 | 2016-07-06 | 中国科学院地质与地球物理研究所 | A kind of pilot system for rock mass discontinuity performance test and test method |
| CN104007025A (en) * | 2014-05-08 | 2014-08-27 | 河海大学 | Multifunctional tilt table device used for testing interfacial shear strength characteristics of geotechnical synthetic material |
| CN104198307B (en) * | 2014-09-03 | 2016-08-17 | 安徽理工大学 | A kind of unidirectional pressure cuts one dynamic stress and strain test device |
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