CN106290006A - A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process - Google Patents
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process Download PDFInfo
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- CN106290006A CN106290006A CN201610651210.6A CN201610651210A CN106290006A CN 106290006 A CN106290006 A CN 106290006A CN 201610651210 A CN201610651210 A CN 201610651210A CN 106290006 A CN106290006 A CN 106290006A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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Abstract
The present invention relates to a kind of assay device measuring the change of shear strength parameter in soft clay consolidation process, belong to soft clay analytical equipment technical field, including framework, load plate, miniature cross plate shearing instrument, torsiograph, sample chamber, measuring unit and the elevating mechanism of band pore pressure test function；Load plate is arranged on the top of sample chamber, load plate or sample chamber and is arranged on framework by elevating mechanism；Measuring unit includes the sensor for gathering the information such as pore water pressure, soil pressure, displacement；The present invention is possible not only to individually study without failure by shear mechanism during body change effect or without failure by shear mechanism during pore pressure effect, and can study the failure by shear mechanism under body change, pore pressure coupling simultaneously, and experiment type is abundanter；Also can study the shearing strength change loading at soft clay and causing with soil deformation and pore pressure change in consolidation process, study the Changing Pattern with consolidation process of the shear strength parameter along with whole research process.
Description
Technical field
The present invention relates to a kind of assay device measuring the change of shear strength parameter in soft clay consolidation process, belong to soft glutinous
Soil analysis device technique field.
Background technology
The shearing strength of soft clay can increase along with pore pressure dissipation in consolidation process, effective stress and increase, ground steady
The qualitative also active development by the change along with loading procedure and shearing strength.Therefore, during the stability analysis of Soft Clay Foundation,
Need the shearing strength change considering to load and cause with soil deformation and pore pressure change in consolidation process, to carry out from loading
The short-term stability gradual transition of construction time is to the long-time stability of normal validity period, the analysis of stability of the most whole life cycle management
Analysis.The Engineering Projects of Soft Clay Foundation unstable failure and stability analysis shows, sending out of deformation that discharging consolidation causes and pore pressure
Open up the dynamically change for soft clay shearing strength and have extremely important impact.Fully realize the two factor jointly to act on down
The shearing strength characteristic of soft clay is the important prerequisite carrying out Soft Clay Foundation stability analysis.
At present, the laboratory experiment means disclosing soil classifiction characteristic mainly have direct shear test and triaxial test, generally
There is following three types: do not consolidate not draining (UU), consolidate not draining (CU) and consolidation draining (CD).Wherein, UU and CU is real
Test and can measure the undrained shear strength (rather than intensity index) being consolidated with before certain is cut under the conditions of efficacy and void ratio, be suitable for
In φ=0 method Analysis on Groundwork Stability；CU experiment can measure total stress Shear Strength Index, it is adaptable to total stress method ground
Stability analysis；CU and CD experiment can measure effective stress Shear Strength Index, it is adaptable to effective stress method foundation stability
Analyze.In UU and CU experiment shear history, soil sample not draining completely, body becomes εv= 0；In CD experimentation, soil sample is arranged completely
Water, pore pressure u=0.Obviously, normal experiment type hydraulic boundary conditions in shear history is not draining completely and arranges completely
The hydraulic boundary conditions that water both is extreme, UU and CU experiment only embodies without failure by shear mechanism during body change effect, and CD
Experiment only embodies without failure by shear mechanism during pore pressure effect.
Although direct shear apparatus, triaxial apparatus can be consolidated with the experiment under the conditions of efficacy by difference before being cut, the reflection soil body
The characteristic that shearing strength increases with being consolidated with efficacy increase before cutting, but with Soft Clay Foundation consolidation in Practical Project simultaneously
Shear, i.e. body becomes not consistent with the failure by shear mechanism under pore pressure coupling, and, the shearing resistance of soft clay can not be reflected
Intensity never hull-borne is transitioned into the progressive formation of hull-borne.Therefore, it is quite necessary to develop one can carry out consolidation
During the assay device of Study on strength of soft clay.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of soft clay of measuring consolidated
The assay device of shear strength parameter change in journey, is used for simulating, studying soil body sedimentation in saturated soft clay consolidation process
The Changing Pattern of exhibition, pore water pressure dissipation, shearing strength etc. so that technical staff can more intuitively, collect more accurately
Shearing strength variation characteristic in saturated soft clay consolidation process.
For reaching above-mentioned purpose, the present invention provides a kind of and measures the examination of shear strength parameter change in soft clay consolidation process
Experiment device, it is characterised in that include framework, load plate, the miniature cross plate shearing instrument of several band pore pressure test functions, torsion
Count, for placing the sample chamber of sample, measuring unit and elevating mechanism；
It is provided with drainage arrangement in described sample chamber；
Described load plate is arranged on the top of described sample chamber, described load plate or described sample chamber and is set by described elevating mechanism
Put on said frame；
Described measuring unit includes sensor data acquisition device, several are for measuring the pore water of sample Pore Pressure
Pressure transducer, several be positioned at described examination for measuring soil pressure sensors of soil pressure in sample and several for measurement
The displacement transducer of specimen height change in specimen chamber；
Several described pore water pressure sensors and several described soil pressures it are respectively arranged with on the lower surface of described load plate
Force transducer, is provided with several described soil pressure sensors in described sample chamber；Institute's displacement sensors is arranged on described examination
By the sidewall of specimen chamber；The outfan of described pore water pressure sensor, described soil pressure sensor and institute's displacement sensors is equal
Electrically connect with the input of described sensor data acquisition device；
Several miniature cross plate shearing instruments are symmetrically disposed in described load plate, and described miniature cross plate shearing instrument all rotates
Connect described load plate；Described torsiograph is removably connected together the upper end of miniature cross plate shearing instrument.
Preferentially, described drainage arrangement includes draining board and drain pipe；Described draining board is arranged on the end of described sample chamber
Portion, a drain chamber is formed on the bottom of described draining board and described sample chamber, and one end of described drain pipe connects described drain chamber,
Described drain pipe is positioned at the outside of described sample chamber.
Preferentially, described elevating mechanism includes air compressor, cylinder and barostat；Described air compressor defeated
Going out end and connect the input of described barostat, the outfan of described barostat connects the input of described cylinder.
Preferentially, fixing device, hoistable platform and several axostylus axostyles are also included；Several described axostylus axostyles are symmetricly set on institute
Stating on framework, described hoistable platform is slidably connected described axostylus axostyle, and described sample chamber is arranged on described hoistable platform, described lifting
The lower section of platform is provided with cushion block, and described cushion block is fixedly installed on the lower surface of described hoistable platform, and described cylinder is positioned at institute
Stating below cushion block, described cylinder is vertically provided at the lower end of described framework；Described load plate is fixing even by described fixing device
Connect described framework；When described cylinder jacking, the piston rod of described cylinder is connected together described cushion block thus drives described lifting
Platform moves upward.
Preferentially, described cylinder is vertically fixedly installed on said frame, and described cylinder is positioned at above described load plate, institute
State the piston rod described load plate of fixing connection of cylinder；Described sample chamber is fixedly installed on said frame.
Preferentially, adjustable rail, cylinder supports framework, sliding platform and rocking bar are also included；Described cylinder supports framework
Arranging on said frame, described adjustable rail is arranged on described cylinder supports framework, and described adjustable rail is positioned at institute
Stating the lower section of hoistable platform, described sliding platform is rotationally connected described adjustable rail by described rocking bar, and described cylinder is arranged
On described sliding platform.
Preferentially, U-shaped sealing necklace is also included；Described U-shaped sealing necklace is wrapped on the sidewall of described load plate.
Preferentially, described miniature cross plate shearing instrument also includes described pore water pressure sensor；Described pore water pressure
Sensor is fixedly installed on the bottom of described miniature cross plate shearing instrument by transparent rubber plug.
Preferentially, described draining board offering several equally distributed osculums, draining board is arranged with reinforcement and props up
Support.
Preferentially, the material of described framework is stainless steel metal.
The beneficial effect that the present invention is reached:
(1) it is possible not only to individually study without failure by shear mechanism during body change effect or without pore pressure effect by apparatus of the present invention
Time failure by shear mechanism, and can study simultaneously body become, failure by shear mechanism under pore pressure coupling, record sample consolidation
During the data such as soil body pore pressure, soil pressure, sedimentation and shearing strength, and then quantitative analysis consolidation effect, experiment type is richer
Rich；
(2) shearing resistance that the present invention can study soft clay loads and in consolidation process, adjoint soil deformation and pore pressure change cause is strong
Degree change, can reflect that the shearing strength never hull-borne of soft clay is transitioned into the progressive formation of hull-borne, to carry out from adding
Carrying the short-term stability gradual transition long-time stability analysis to normal validity period of construction time, research was studied along with whole
The Changing Pattern of journey, the data of collection more have universality, send out promoting research soft clay teaching and scientific research assay device
Exhibition has the contribution of brilliance.
Accompanying drawing explanation
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the front view of the present invention；
Fig. 3 is the side view of the present invention；
Fig. 4 is the top view of the present invention；
Fig. 5 is the upward view of the present invention.
Implication in reference, 1-framework；2-load plate；The miniature cross plate shearing instrument of 3-band pore pressure test function；4-
Load plate fixing device；5-sample chamber；6-porous disc；7-drain pipe；8-pore water pressure sensor；9-soil pressure sensor；
10-displacement transducer；11-axostylus axostyle；12-hoistable platform；13-sample chamber support frame；14-cylinder；15-adjustable rail；16-
Cylinder supports framework；17-rocking bar；18-barostat；19-U type sealing necklace；20-piston rod；21-cushion block.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating the present invention
Technical scheme, and can not limit the scope of the invention with this.
Embodiment one
The present invention relates to a kind of assay device measuring the change of shear strength parameter in soft clay consolidation process, including framework 1,
3, torsiograph of the miniature cross plate shearing instrument of 2, six band pore pressure test functions of load plate, for placing the sample chamber of sample
5, measuring unit and elevating mechanism；
Being provided with drainage arrangement in the bottom of sample chamber 5, drainage arrangement includes draining board 6 and drain pipe 7；Sample chamber 5 is cylinder
Body, draining board 6 is the plectane that diameter is equal with sample chamber 5 interior diameter；
Draining board 6 is arranged on the bottom of sample chamber 5, and a drain chamber is formed on the bottom of draining board 6 and sample chamber 5, drain pipe 7
One end rotates communicated drainage chamber, and the other end of drain pipe 7 is adjustable to the highest with the roof of sample chamber 5, and drain pipe 7 is positioned at sample
The outside of room 5；Offering multiple equally distributed osculum on draining board 6, water can flow in drain pipe 7 by osculum,
Draining board 6 is arranged with reinforcement and supports to prevent from being subject to crushing and detachable, easy to use.
Load plate 2 is arranged on the top of sample chamber 5, and load plate 2 is arranged on framework 1 by elevating mechanism；
Measuring unit includes sensor data acquisition device, several are for gathering the pore water pressure of sample Pore Pressure
Sensor 8, several soil pressure sensor 9 and a displacement transducer 10, two holes being used for gathering soil pressure in sample
Water pressure sensor 8 and two soil pressure sensors 9 are symmetrically arranged on the lower surface of load plate 2, monitor consolidation process
Pore Pressure and soil pressure situation of change, the position of two kinds of sensors is fixed and detachably；
Draining board 6 upper surface is the most along the circumferential direction symmetrically provided with three soil pressure sensors 9 by axle center, for prison in real time
Survey the change of soil pressure in consolidation loading procedure, and sample chamber 5 can be drawn according to the soil pressure difference calculating sample upper and lower surface
The size of middle side friction power；Displacement transducer 10 is arranged on by the sidewall of sample chamber 5, outside displacement transducer 10 one end is fixed on
On portion's metal framework 1, the other end is then arranged along the axis direction being parallel to sample chamber 5 when on-test；
The outfan of pore water pressure sensor 8, soil pressure sensor 9 and displacement transducer 10 all fills with sensor data acquisition
The input electrical connection put；The data that i.e. pore water pressure sensor 8, soil pressure sensor 9 and displacement transducer 10 record are led to
Cross wire to be sent to sensor data acquisition device and carry out record, facilitate follow-up analysis.
It is strong in consolidation process Pore Pressure, soil pressure, settling amount and shearing resistance that measuring unit can monitor sample in real time
The change of degree, and then quantitative analysis consolidation effect, for soil body sedimentation development, hole in soft clay consolidation process saturated in Practical Project
The analysis of the Changing Pattern of the dissipation of gap water pressure, shearing strength etc. provides foundation.
The miniature cross plate shearing instrument 3 of six band pore pressure test functions is symmetrically disposed in load plate 2, and band pore pressure is tested
The miniature cross plate shearing instrument 3 of function is all rotationally connected load plate 2；Miniature cross plate shearing instrument 3 includes being arranged on himself end
The pore water pressure sensor 8 of end, pore water pressure sensor 8 is fixed on the micro-of band pore pressure test function by transparent rubber plug
On type cross plate shearing instrument 3.
Torsiograph is arranged on the upper end of the miniature cross plate shearing instrument 3 of band pore pressure test function, band pore pressure test function
The lower end of miniature cross plate shearing instrument 3 is provided with pore water pressure sensor 8, and pore water pressure sensor 8 is by transparent rubber
In the bottom of the axostylus axostyle that plug is fixed on miniature cross plate shearing instrument 3, and by miniature the ten of 550 mm long band pore pressure test functions
Letter stencil boxshear apparatus 3 is fixed on 150 mm positions bottom distance Metal loading plate 2 by axial load principle.
Miniature cross plate shearing instrument 3 with pore pressure test function coordinates torsiograph, is used for testing saturated soft clay and consolidated
Shearing strength in journey and the pore pressure of sample disturbance caused by shearing.Miniature cross plate shearing instrument with pore pressure test function
Hexagon bolt shape is made on 3 tops, and the top of torsiograph just can be enclosed within it and reverse, and only needs a torsiograph
, when needing the miniature cross plate shearing instrument 3 carrying out band pore pressure test function to shear every time, it is enclosed within band pore pressure test function
Miniature cross plate shearing instrument 3 upper end can use, be finished and can unload.Load plate 2 is cylinder, the diameter etc. of load plate 2
Interior diameter in sample chamber 5.
Elevating mechanism includes air compressor, cylinder 14 and barostat 18；The outfan of air compressor connects gas
The input of pressure actuator 18, the outfan of barostat 18 connects cylinder 14.
Cylinder 14 is vertically fixedly installed on framework 1, and cylinder 14 is positioned at above load plate 2, and the piston rod 20 of cylinder 14 is solid
Surely load plate 2 is connected；Sample chamber 5 is fixedly installed on framework 1, and sample chamber 5 is cylinder, and the size of sample chamber 5 is diameter 474
Mm, high 550 mm；Sample chamber 5 entirety is by the 10 thick transparent tempering poly (methyl methacrylate) plates of mm and floor is cementing forms.Elevating mechanism and
Form, between outside stainless steel metal framework 1, the cavity volume that can be simulated loading.Cylinder 14 is fixed on framework 1 top centre,
During loading, load plate 2 is declined by cylinder 14, when load plate 2 move to sample upper surface just with the lower surface of load plate 2
During contact, the value of barostat 18 being returned to zero, now cylinder 14 stops, and then carries out the applying of subsequent stages load.
Present invention additionally comprises adjustable rail 15, cylinder supports framework 16, sliding platform and rocking bar 17；Cylinder supports framework
16 tops being arranged on framework 1, adjustable rail 15 is arranged on cylinder supports framework 16, and adjustable rail 15 is positioned at cylinder 14
Top, sliding platform is rotationally connected adjustable rail 15 by rocking bar 17, and the top of cylinder 14 is arranged on sliding platform.
Present invention additionally comprises U-shaped sealing necklace 19；Load plate 2 itself is waterproof, and U-shaped sealing necklace 19 is wrapped in load plate
On the sidewall of 2 so that when testing, load plate 2 can be considered impervious boundary.With sample chamber 5 upper end on U-shaped sealing necklace 19
Inwall on one layer of vaseline of uniform application be used for reducing resistance.
The material of framework 1 is stainless steel metal, and the material of load plate 2 is metal.
The specific works process of the present invention:
Step one: shake rocking bar 17 thus move the center to framework 1 top by sliding platform band dynamic air cylinder 14；By displacement
One end of sensor 10 is fixed on framework 1, and the other end keeps parallel with the axis of sample chamber 5 when experiment starts；
Step 2: stick graph paper on the sidewall of sample chamber 5 for measuring the height having filled soil sample；Sample chamber 5 is fixed on
On framework 1, i.e. the underface of load plate 2；Close drain pipe 7, at draining board 6, then lay a metafiltration paper；
Step 3: water filling in sample chamber 5 is until water surface elevation exceeds draining board 6 about 30mm, by satisfying of certain moisture content of preparation
Inserting in sample chamber 5 with soil sample i.e. sample, insert about 30 samples high for mm every time, sample is submerged in below the water surface always, fills sample
Ensure bubble-free uniformly and in soil, stand about 10 min after dress sample every time；
Step 4: repeat step 3, until the height of sample reaches to be positioned at above draining board 6 at about 42 cm；
Step 5: rotate drain pipe 7 and make the outlet of drain pipe 7 and the either flush of sample, open drain pipe 7 drain sample room 5
In beyond the water of sample end face；Sample is the most submerged in water in consolidation process, thus ensures that sample begins in consolidation process
The most saturated, draining board 6 and drain pipe 7 are equivalent of from by Brainage boundary；Make sample preliminary consolidation 24 under deadweight and seepage effect
Hour, when tentatively having consolidated, the elemental height of sample is about 40 cm；
Step 6: load plate 2 declined under the drive of cylinder 14, until the lower surface of load plate 2 touches sample, load plate
Seal between 2 and sample chamber 5 inwall and form impervious boundary；To conduct oneself with dignity with sample chamber 5 due to sample, and load plate 2 and sample
The force value that the side friction power of room 5 produces jointly is returned to zero by barostat 18；
Step 7；Implement to load according to loading schedule, monitored sample pore pressure, soil pressure in consolidation process by measuring unit in real time
Power and the change of settling amount, by being placed on torsiograph one by one on the top of miniature cross plate shearing instrument 3 in measurement sample
Shearing force, the data such as soil body pore pressure, soil pressure, sedimentation and shearing strength in record sample consolidation process, and then quantitative analysis consolidation
Effect, carries out the miniature vane shear test of band pore pressure test function to be consolidated with torsiograph when reaching certain degree of consolidation
During the Changing Pattern of soil shear strength, simulate soil body sedimentation development, pore water pressure in saturated soft clay consolidation process
The Changing Pattern of dissipation, shearing strength etc..
Embodiment two
Measure the assay device of shear strength parameter change in soft clay consolidation process as it is shown in figure 1, a kind of, including framework 1, add
The miniature cross plate shearing instrument 3 of 2, six band pore pressure test functions of support plate, torsiograph, for place sample sample chamber 5, measure
Unit and elevating mechanism；
The bottom of sample chamber 5 is provided with drainage arrangement, and drainage arrangement includes draining board 6 and drain pipe 7；Draining board 6 is arranged on examination
The bottom of specimen chamber 5, a drain chamber is formed on the bottom of draining board 6 and sample chamber 5, and one end of drain pipe 7 rotates communicated drainage chamber,
The other end of drain pipe 7 is adjustable to the highest with the roof of sample chamber 5, and drain pipe 7 is positioned at the outside of sample chamber 5；Sample chamber 5 is
Cylinder, draining board 6 is the plectane that diameter is equal with sample chamber 5 interior diameter；
Offering multiple equally distributed osculum on draining board 6, water can flow in drain pipe 7 by osculum, draining board 6
It is arranged with reinforcement to support to prevent from being subject to crushing and detachable, easy to use.
Load plate 2 is arranged on the surface of sample chamber 5, and sample chamber 5 is arranged on framework 1 by elevating mechanism；
Elevating mechanism includes hoistable platform 12, air compressor, cylinder 14 and barostat 18；The outfan of air compressor
Connecting the input of barostat 18, the outfan of barostat 18 connects cylinder 14.Cylinder 14 is fixed on bottom framework 1
Centre, by sample chamber 5 by hoistable platform 12 jacking during loading, when sample chamber 5 by jacking to sample upper surface just with add
When the lower surface of support plate 2 contacts, the value of barostat 18 being returned to zero, now cylinder 14 stops, and then carries out subsequent stages lotus
The applying carried.
As in figure 2 it is shown, measuring unit includes sensor data acquisition device, pore water pressure sensor 8, soil pressure sensing
Device 9 and displacement transducer 10, the lower surface of load plate 2 is respectively symmetrically and is provided with two pore water pressure sensors 8 and two
Soil pressure sensor 9, monitoring consolidation process Pore Pressure and soil pressure situation of change, the position of two kinds of sensors fix and
Detachably；
Draining board 6 upper surface is the most along the circumferential direction symmetrically provided with three soil pressure sensors 9 by axle center, for prison in real time
Survey the change of soil pressure in consolidation loading procedure, and sample chamber 5 can be drawn according to the soil pressure difference calculating sample upper and lower surface
The size of middle side friction power；Displacement transducer 10 is arranged on by the sidewall of sample chamber 5, outside displacement transducer 10 one end is fixed on
On portion's metal framework 1, the other end then when on-test along being parallel to the axis direction setting i.e. hoistable platform 12 of sample chamber 5
On；The outfan of pore water pressure sensor 8, soil pressure sensor 9 and displacement transducer 10 all fills with sensor data acquisition
The input electrical connection put；The data that i.e. pore water pressure sensor 8, soil pressure sensor 9 and displacement transducer 10 record are led to
Cross wire to be sent to sensor data acquisition device and carry out record, facilitate follow-up analysis.
It is strong in consolidation process Pore Pressure, soil pressure, settling amount and shearing resistance that measuring unit can monitor sample in real time
The change of degree, and then quantitative analysis consolidation effect, for soil body sedimentation development, hole in soft clay consolidation process saturated in Practical Project
The analysis on change of the dissipation of gap water pressure, shearing strength etc. provides foundation.
As shown in Figure 4, the miniature cross plate shearing instrument 3 of six band pore pressure test functions is symmetrically disposed in load plate 2,
Miniature cross plate shearing instrument 3 with pore pressure test function is all rotationally connected load plate 2；Miniature cross plate shearing instrument 3 includes arranging
At the pore water pressure sensor 8 of himself bottom, pore water pressure sensor 8 is fixed on band pore pressure by transparent rubber plug and surveys
In the bottom of the miniature cross plate shearing instrument 3 of examination function.
Torsiograph is arranged on the upper end of the miniature cross plate shearing instrument 3 of band pore pressure test function, and by with holes for 550 mm length
The miniature cross plate shearing instrument 3 of pressure test function is fixed on 150 mm positions bottom distance Metal loading plate 2 by axial load principle
Place.
Miniature cross plate shearing instrument 3 with pore pressure test function coordinates torsiograph, is used for testing saturated soft clay and consolidated
Shearing strength in journey and the pore pressure of sample disturbance caused by shearing.Hexagon is made on miniature cross plate shearing instrument 3 top
Bolt shape, and the top of torsiograph just can be enclosed within it and reverse, and only need a torsiograph, needing every time
Carrying out miniature cross plate shearing instrument 3 when shearing, being enclosed within miniature cross plate shearing instrument 3 upper end can use, and is finished and can unload.
As it is shown on figure 3, present invention additionally comprises fixing device 4, hoistable platform 12 and four axostylus axostyles 11；Four axostylus axostyles 11 are symmetrical
Being arranged on framework 1, hoistable platform 12 is slidably connected axostylus axostyle 11, and sample chamber 5 is arranged on hoistable platform 12, and sample chamber 5 is circle
Cylinder, the size of sample chamber 5 is diameter 474 mm, high 550 mm；Sample chamber 5 entirety is by the thick transparent organic glass of tempering of 10 mm
Glass plate and floor is cementing forms.
The lower section of hoistable platform 12 is provided with cushion block 21, and cushion block 21 is fixedly installed on the underface of hoistable platform 12, passes through
The jacking effect of cylinder 14 makes piston rod 20 be connected together with cushion block 21.Hoistable platform 12 and outside stainless steel metal framework 1
Between formed can be simulated load cavity volume；Cylinder 14 is vertically provided on framework 1, and cylinder 14 is positioned at below cushion block 21；Add
Support plate 2 is by fixing device 4 fixed connecting frame frame 1.
As it is shown in figure 5, present invention additionally comprises adjustable rail 15, cylinder supports framework 16, sliding platform and rocking bar 17；Gas
Cylinder support frame 16 is arranged on framework 1, and adjustable rail 15 is arranged on cylinder supports framework 16, and adjustable rail 15 is positioned at
The lower section of hoistable platform 12, sliding platform is rotationally connected adjustable rail 15 by rocking bar 17, and cylinder 14 is arranged on sliding platform
On.
Present invention additionally comprises U-shaped sealing necklace 19；Load plate 2 itself is waterproof, and U-shaped sealing necklace 19 is wrapped in load plate
On the sidewall of 2 so that when testing, load plate 2 can be considered impervious boundary.
The material of framework 1 is stainless steel metal, and the material of load plate 2 is metal.
The specific works process of the present invention:
Step one: shake rocking bar 17 thus move the center to framework 1 by sliding platform band dynamic air cylinder 14；By displacement
One end of sensor 10 is fixed on framework 1, and the other end keeps parallel with the axis of sample chamber 5 when experiment starts；
Step 2: stick graph paper on the sidewall of sample chamber 5 for measuring the height having filled soil sample；Sample chamber 5 is placed on
On hoistable platform 12, i.e. the underface of load plate 2；Close drain pipe 7, at draining board 6, then lay a metafiltration paper；
Step 3: disposable water filling in sample chamber 5 until water surface elevation exceeds draining board 6 about 30mm, by preparation certain is aqueous
The saturated soil sample i.e. sample of rate is inserted in sample chamber 5, inserts about 30 samples high for mm every time, and now sample is submerged in water always
Below face, dress sample ensures uniformly and bubble-free in soil, stands about 10 min after dress sample every time；
Step 4: repeat step 3, until the height of sample reaches to be positioned at above draining board 6 at about 42 cm；
Step 5: rotate drain pipe 7 and make the outlet of drain pipe 7 and the either flush of sample, open drain pipe 7 drain sample room 5
In beyond the water of sample end face, keep sample the most submerged in water thus ensure that sample is in consolidation process in consolidation process
The most saturated, draining board 6 and drain pipe 7 are equivalent of from by Brainage boundary；Sample is made tentatively to consolidate under deadweight and seepage effect
24 hours, when tentatively having consolidated, the elemental height of sample was about 40 cm；
Step 6: by sample chamber 5 jacking under the drive of cylinder 14, until sample contacts is to the lower surface of load plate 2, load plate
Seal between 2 and sample chamber 5 inwall and form impervious boundary；To conduct oneself with dignity with sample chamber 5 due to sample, and load plate 2 and sample
The force value that the side friction power of room 5 produces jointly is returned to zero by barostat 18；
Step 7；Implement to load according to loading schedule, monitored sample pore pressure, soil pressure in consolidation process by measuring unit in real time
Power and the change of settling amount, by being placed on torsiograph one by one on the top of miniature cross plate shearing instrument 3 in measurement sample
Shearing force, the data such as soil body pore pressure, soil pressure, sedimentation and shearing strength in record sample consolidation process, and then quantitative analysis consolidation
Effect, carries out the miniature vane shear test of band pore pressure test function to be consolidated with torsiograph when reaching certain degree of consolidation
During the Changing Pattern of soil shear strength, simulate soil body sedimentation development, pore water pressure in saturated soft clay consolidation process
The Changing Pattern of dissipation, shearing strength etc..
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation, these improve and deformation
Also should be regarded as protection scope of the present invention.
Claims (10)
1. measure the assay device of shear strength parameter change in soft clay consolidation process for one kind, it is characterised in that include framework
(1), load plate (2), the miniature cross plate shearing instrument (3) of several band pore pressure test functions, torsiograph, for placing sample
Sample chamber (5), measuring unit and elevating mechanism；
Described sample chamber is provided with drainage arrangement in (5)；
Described load plate (2) is arranged on the top of described sample chamber (5), described load plate (2) or described sample chamber (5) and passes through institute
State elevating mechanism to be arranged on described framework (1)；
Described measuring unit includes sensor data acquisition device, several are for measuring the pore water of sample Pore Pressure
Pressure transducer (8), several are used for measurement are positioned at for measuring soil pressure sensors (9) of soil pressure in sample and several
The displacement transducer (10) of specimen height change in described sample chamber (5)；
Several described pore water pressure sensors (8) and several institutes it is respectively arranged with on the lower surface of described load plate (2)
State soil pressure sensor (9), in described sample chamber (5), be provided with several described soil pressure sensors (9)；Described displacement sensing
Device (10) is arranged on by the sidewall of described sample chamber (5)；Described pore water pressure sensor (8), described soil pressure sensor (9)
All inputs with described sensor data acquisition device electrically connect with the outfan of institute's displacement sensors (10)；
Several miniature cross plate shearing instruments (3) are symmetrically disposed in described load plate (2), described miniature cross plate shearing instrument
(3) described load plate (2) all it is rotationally connected；Described torsiograph is removably connected together miniature cross plate shearing instrument (3).
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 1,
It is characterized in that, described drainage arrangement includes draining board (6) and drain pipe (7)；Described draining board (6) is arranged on described sample chamber
(5) bottom, a drain chamber, the one of described drain pipe (7) are formed on the bottom of described draining board (6) and described sample chamber (5)
End connects described drain chamber, and described drain pipe (7) is positioned at the outside of described sample chamber (5).
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 1,
It is characterized in that, described elevating mechanism includes air compressor, cylinder (14) and barostat (18)；Described air compressor
Outfan connect the input of described barostat (18), the outfan of described barostat (18) connects described cylinder
(14) input.
4. described a kind of measure the examination of shear strength parameter change in soft clay consolidation process according to claim 1 and 3 is arbitrary
Experiment device, it is characterised in that also include fixing device (4), hoistable platform (12) and several axostylus axostyles (11)；Several described axles
Bar (11) is symmetricly set on described framework (1), and described hoistable platform (12) is slidably connected described axostylus axostyle (11), described sample chamber
(5) being arranged on described hoistable platform (12), the lower section of described hoistable platform (12) is provided with cushion block (21), described cushion block (21)
Being fixedly installed on the lower surface of described hoistable platform (12), described cylinder (14) is positioned at described cushion block (21) lower section, described gas
Cylinder (14) is vertically provided at the lower end of described framework (1)；Described load plate (2) connects institute by described fixing device (4) is fixing
State framework (1)；When described cylinder (14) jacking, the piston rod (20) of described cylinder (14) be connected together described cushion block (21) from
And drive described hoistable platform (12) to move upward.
5. described a kind of measure the examination of shear strength parameter change in soft clay consolidation process according to claim 1 and 3 is arbitrary
Experiment device, it is characterised in that described cylinder (14) is vertically fixedly installed on described framework (1), and described cylinder (14) is positioned at institute
Stating load plate (2) top, the piston rod (20) of described cylinder (14) is fixing connects described load plate (2)；Described sample chamber (5) is solid
Surely it is arranged on described framework (1).
6. described a kind of measure shear strength parameter change in soft clay consolidation process according to claim 1,3 and 4 are arbitrary
Assay device, it is characterised in that also include adjustable rail (15), cylinder supports framework (16), sliding platform and rocking bar (17)；
Described cylinder supports framework (16) is arranged on described framework (1), and described adjustable rail (15) is arranged on described cylinder supports
On framework (16), described adjustable rail (15) is positioned at the lower section of described hoistable platform (12), and described sliding platform is by described
Rocking bar (17) is rotationally connected described adjustable rail (15), and described cylinder (14) is arranged on described sliding platform.
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 1,
It is characterized in that, also include U-shaped sealing necklace (19)；Described U-shaped sealing necklace (19) is wrapped in the sidewall of described load plate (2)
On.
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 1,
It is characterized in that, described miniature cross plate shearing instrument (3) also includes described pore water pressure sensor (8)；Described pore water pressure
Force transducer (8) is fixedly installed on the bottom of described miniature cross plate shearing instrument (3) by transparent rubber plug.
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 2,
It is characterized in that, described draining board (6) offers several equally distributed osculums, and draining board (6) is arranged with reinforcement
Support.
A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process the most according to claim 1,
It is characterized in that, the material of described framework (1) is stainless steel metal.
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