CN107884325A - A kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution - Google Patents
A kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution Download PDFInfo
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- 238000010998 test method Methods 0.000 title claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 17
- 238000011161 development Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 230000003204 osmotic effect Effects 0.000 claims abstract description 8
- 238000009412 basement excavation Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000003780 insertion Methods 0.000 claims abstract description 3
- 230000037431 insertion Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000000465 moulding Methods 0.000 claims description 24
- 239000011159 matrix material Substances 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 9
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 8
- 230000008595 infiltration Effects 0.000 claims description 8
- 238000001764 infiltration Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- 229940094933 n-dodecane Drugs 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 229910000754 Wrought iron Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 238000011835 investigation Methods 0.000 abstract 1
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- 238000004088 simulation Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910001622 calcium bromide Inorganic materials 0.000 description 3
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 229920005372 Plexiglas® Polymers 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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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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Abstract
The invention discloses a kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution, including head control system and foundation ditch analogue means.Head control system is connected by feed pipe with see-through model bottom portion, see-through model bottom portion laying multilayer cobble, and transparent soil is placed above multilayer cobble；Excavation forms foundation ditch after campshed is inserted in the transparent soil body so that the insertion depth of campshed is more than foundation depth；The transparent soil that bottom of foundation ditch is squeezed into using laser section forms speckle field, adjust head control system, when osmotic fluid is through during the transparent soil of multilayer cobble impact bottom of foundation ditch, the speckle field is continuously shot by CCD camera, the speckle field of acquisition is analyzed using Computer Image Processing software afterwards, the development of soil particle riding chain and the process developed in transparent soil are obtained, the mechanism for bottom of foundation ditch seepage failure under further investigation campshed supporting condition provides foundation.The technology of the present invention, transparent soil material and computer image processing technology are make use of, the process that seepage failure occurs for bottom of foundation ditch under campshed supporting condition can be simulated, test model is simple, easy to operate, and economic feasibility is high.
Description
Technical field
The invention belongs to Geotechnical Engineering experimental technique field, more particularly to a kind of simulation campshed supporting foundation pit seepage failure hair
The experimental rig and test method of exhibition process.
Background technology
Geotechnical Engineering is an important branch of field of civil engineering, is to solve to include foundation ditch destruction, Rock And Soil
The rock mass such as seepage deformation, the basement process subject very strong with a kind of engineering practice of soil body problem.Base pit engineering is as building
The main undertaker of thing load, its security and stability play most important effect in whole building thing construction process.According to
Count, in all cases of foundation ditch accident, the dangerous situation as caused by bottom of foundation ditch seepage failure accounts for more than the 75% of total dangerous situation, infiltration
Destruction refers to because infiltration current go out the fine grained of the soil body, take away or the local soil body produces movement, cause soil deformation and
Caused soil stabilization problem, it generally can be divided into two kinds of forms of piping and fluid.And in the foundation ditch using campshed as supporting construction
In, if in the presence of being banketed after stake, campshed upper end is motionless, lower end is to foundation ditch medial movement, then the soil body of bottom of foundation ditch is protects
Maintain an equal level weighing apparatus, seepage failure often now can be occurred under less hydraulic gradient, so campshed by a upward load
The seepage failure problem of supporting foundation pit has obtained the common concern of academia and engineering circles.
Geotechnical model test be both study rock mechanical feature important means, and in engineering design and construction it is important
Reference frame.The research object of traditional soil test is natural earth, but due to the opacity of natural earth, can not pass through meat
The change of inside soil body soil particle mechanical characteristics during eye observation experiment.It is more and more with the very fast development of science and technology
Method can be used for measuring the mechanical characteristics of inside soil body, such as the methods of CT, x-ray imaging technology, nuclear magnetic resonance
Applied in Geotechnical Engineering model test, but high installation cost and technically existing difficult point greatly limit these technologies
Extensive use.Therefore inquire into a kind of economically viable visual test device and test method just seems particularly urgent.
Before patent of the present invention, China's application patent of invention " piping in foundation pit simulation test device and test method " (application
Number：201510281092.X) disclose a kind of foundation ditch simulated test being made up of water tank, soil body case, simulation foundation ditch, porous plate etc.
Device.There is the technical scheme failure by piping that can effectively simulate in base pit engineering, model test to more conform in Practical Project
Change, scientific and strong operability the advantages that；But the device can only carry for the seepage failure process including piping
For qualitatively recognizing, the change of inside soil body mechanical characteristics during seepage failure can not be observed.Transparent native technology it is basic
Principle is to mix transparent grain material to simulate the saturation soil body with the pore-fluid with identical refractive index, the soil body with it is natural
Soil has similar engineering properties.After forming speckle field in transparent soil using laser, it can be taken by CCD camera high-precision
The picture of degree, after the picture obtained is analyzed by Computer Image Processing software, you can obtain during experiment
Inside soil body particle riding chain develops and the process of development.Therefore, transparent native technology and Computer Image Processing software are merged to divide
The change of inside soil body particle riding chain, easy to operate, economical rationality, is following Geotechnical Engineering measuring technology during analysis experiment
Development trend.
The content of the invention
It is an object of the invention to overcome the shortcomings of prior art and defect, merge at transparent native technology and computer picture
Software is managed, proposes a kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution, the row of solving
The problem that the change of invisible and riding chain accurately measures in stake supporting foundation pit seepage failure evolution, the experimental rig not only carry
High scientific research efficiency, is also used as instruments used for education use.
The invention discloses a kind of experimental rig for simulating campshed supporting foundation pit seepage failure evolution, including head control
System processed and foundation ditch analogue means.Head control system is connected by feed pipe with see-through model bottom portion, see-through model bottom
Multilayer cobble is laid in portion, and transparent soil is placed above multilayer cobble；Excavation forms foundation ditch after campshed is inserted in the transparent soil body so that
The insertion depth of campshed is more than foundation depth；Lay laser in the outside of transparent mould molding box；Lay CCD in the outside of transparent mould molding box
Camera, it is equidistant in transparent soil matrix hole to lay pore pressure measurement apparatus.
Further, the transparent soil used in the experiment by baking tekite sand particle and n-dodecane, ten No. five it is white
The mixed solution of oil is mixed up to made by homogeneous transparent by certain mass ratio at a certain temperature, wherein positive 12
Alkane, ten No. five white oils mixed solution refractive index it is identical with the refractive index for toasting quartz sand particle.
Further, described campshed uses a diameter of 5mm-10mm rod iron, using interval pile sinking in pile driving process
Method, to simulate construction technology live under full-scale condition.
Further, supply tank is provided with the head control system, have in supply tank has with transparent liquid in transparent soil
The n-dodecane of identical mass ratio and the mixed solution of white oil.
Further, the cuboid for being shaped as upper opening of the transparent mould molding box, is made up of plexiglas, to ensure
It has preferable translucency；The length and width of transparent mould molding box is 300mm-400mm, a height of 500-650mm.
Further, the bottom of the transparent mould molding box sets multilayer cobble, is permeated to simulate under full-scale condition
Percussion of the fluid to transparent native bottom of foundation ditch.
Further, provided with multiple pressure-measuring pipes for being used to measure osmotic pressure, multiple pressure-measuring pipes in the transparent soil matrix hole
Arranged for interval.
Further, the supply tank in the head control system is provided with multiple water level controls at the different height of side wall
Valve, the height of water level in supply tank can be adjusted by opening different altitude valves, realize and permeate during Adjustment Tests
The size of head.
Further, described laser is semiconductor chip light source, using intracavity He-Ne laser, can provide 0-3W
Between arbitrarily stable power, and be furnished with converter,linear, spot light can be converted into linear light sorurce.
Further, described CCD camera can pass through tune using German Basler products (scA1600-14fm)
The height and angle of its support are saved, the visual range of preferable CCD camera can be obtained.
Further, described Computer Image Processing software is DIC softwares, can handle campshed supporting foundation pit seepage failure
During a series of captured speckle field photos, so as to obtain the development of soil particle riding chain and the process developed in transparent soil.
A kind of test method for simulating campshed supporting foundation pit seepage failure evolution, it is characterised in that：Cut using laser
The transparent soil that bottom of foundation ditch is squeezed into face forms speckle field, adjusts head control system, when osmotic fluid impacts through multilayer cobble
During the transparent soil of bottom of foundation ditch, the speckle field is continuously shot by CCD camera, utilizes Computer Image Processing software afterwards
The speckle field of acquisition is analyzed, the development of soil particle riding chain and the process developed in transparent soil are obtained, to further investigate campshed
The mechanism of bottom of foundation ditch seepage failure provides foundation under supporting condition.
Further, a kind of test method for simulating campshed supporting foundation pit seepage failure evolution, it is characterised in that：
1) the transparent soil of relevant parameter has been configured by test requirements document, has been poured into transparent mould molding box；
2) after campshed vertically squeezes into transparent soil successively according to the requirement of interval pile, campshed is enclosed into soil using soil sampler
Body is slowly dug out, and ensures that formed bottom of foundation ditch is smooth, and the building-in depth of campshed is more than 0.5 times of foundation depth；
3) injection has the pore-fluid of identical refractive index with transparent soil in supply tank；
4) laser is opened, examines its angle that become clear in the particle section that transparent soil is internally formed, and adjust laser section
Angle, make the bottom in section vertical incidence transparent soil matrix hole, form bright speckle field；
5) open CCD camera and adjust its visual range, the bottom in whole transparent soil matrix hole can be included, camera is protected
Automatic camera pattern is held, and it is set with the frequency collection image of 2 width/second and is sent to computer.
6) a certain altitude valve is opened in head control system so that the infiltration energy in whole head control system
Kept during experiment constant；
7) water inlet pipe water valve is opened, it is laggard that the osmotic fluid in head control system passes sequentially through water inlet pipe, multilayer cobble
Enter transparent mould molding box and impact transparent native bottom of foundation ditch, in the process by the data transfer detected by flowmeter and pressure-measuring pipe extremely
Computer；
8) after the completion of the seepage failure of transparent soil matrix hole, the infiltration obtained is analyzed by computer image processing technology DIC and broken
Bad picture, obtain during seepage failure the development of soil particle riding chain and the process developed in transparent soil matrix hole at different moments.
Advantages of the present invention and effect are：Utilize the mixed solution for toasting quartz sand and n-dodecane, ten No. five white oils
Transparent soil is prepared under certain condition, and campshed is inserted in transparent soil and transparent soil is enclosed to it and is excavated, forms campshed
The transparent soil matrix hole of supporting, by the transparent native bottom of foundation ditch of laser illumination, forms a bright inside soil body particle section, beats
Drive a certain altitude valve and water inlet pipe water valve so that the osmotic fluid in head control system impacts transparent soil matrix hole, at this
During, the speckle field of transparent native bottom of foundation ditch is continuously shot using CCD camera, obtains the section in seepage failure mistake
A series of pictures in journey, and combine Computer Image Processing software and obtain transparent native bottom of foundation ditch soil particle riding chain development and drill
The process of change.Have compared with the experimental rig of other research foundation ditch seepage failure processes and test method as follows significantly a little：
1) test model is simple, and convenient disassembly, feasibility is strong, can be widely applied to Geotechnical Engineering experiment field；
2) transparent native technology and Computer Image Processing software innovatively are combined to study foundation ditch and oozed by the present invention
Destroy thoroughly, realize the development of soil particle riding chain and the process developed in campshed supporting foundation pit seepage deformation evolution, be deep
The mechanism for studying bottom of foundation ditch seepage failure under campshed supporting condition provides foundation.
3) osmotic fluid of head control system using penetrating into from bottom to top, meets base pit engineering bottom soil body in the present invention
The situation of seepage failure occurs.
4) foundation ditch in the present invention use campshed support form, considers excavation of foundation pit depth during Practical Project excavation of foundation pit
When degree, Adjacent Buildings and pipeline influence and underground water, soil condition, supporting construction is often used to prevent instability of foundation pit,
In addition, campshed supporting foundation pit bottom soil body is easier that seepage failure occurs, therefore with being used in foundation ditch seepage failure patent before
Slope form is compared, and model of the present invention more meets engineering requirements, and the result of gained has more referential.
Brief description of the drawings
Fig. 1 is the system schematic of model test apparatus of the present invention
Fig. 2 is the oblique view of foundation pit device of the present invention
Fig. 3 is the top view of foundation pit device of the present invention
Wherein：1 is water inlet, and 2 be altitude valve, and 3 be water inlet pipe, and 4 be computer, and 5 be CCD camera, and 6 be pressure measurement
Pipe, 7 be multilayer cobble, and 8 be campshed, and 9 be transparent mould molding box, and 10 be transparent soil, and 11 be laser, and 12 be supply tank, and 13 be confession
Water pipe water valve, 14 be flowmeter.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme of the embodiment of the present invention is carried out two kinds it is clear,
Complete description.
Example one：
The first step：First, on the premise of guarantee test local environment temperature is constant, by n-dodecane and ten No. five white oils
(being 24 DEG C in this example) (is 1 in this example by certain mass ratio at a certain temperature：4) composition mixed solution, and with
The abundant mix of quartz sand particle is toasted until soil sample homogeneous transparent, is prepared into transparent native the 10 of simulation saturation cohesive soil.
Second step：Transparent mould molding box 9 is laid on smooth optical table, ensures uniform light in place, in this example
The size of transparent mould molding box 9 is 400 (length) × 400 (width) × 600 (height) (units：Mm), its upper opening, material selection printing opacity
The plexiglas of sexual satisfaction requirement；Multilayer cobble is laid in the bottom of transparent mould molding box 9 and permeates water under full-scale condition to simulate
Stream is to transparent native 10 percussion；Artificial synthesized transparent native 10 are inserted in transparent mould molding box 9.
3rd step：25 campsheds 8 are squeezed into transparent native 10 by pile sinking load apparatus, pile sinking is using interval pile sinking, with mould
Intend construction technology live under full-scale condition, pile sinking speed is strictly controlled in pile driving process, ensure that the vertical injection of campshed is transparent
In soil 10, the problems such as pile position deviation is excessive is prevented, campshed 8 diameter 10mm, length 300mm employed in this example, no
Become rusty steel material, before pile sinking with wet towel by its surface wipes it is clean after dry；After pile sinking terminates, campshed is enclosed using soil sampler
The soil body is slowly dug out, and ensures that formed bottom of foundation ditch is smooth, the building-in depth of campshed should be greater than 0.5 times of foundation depth.
4th step：A kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution, including
Head control system, supply tank 12 is provided with head control system, the top of supply tank 12 is provided with water inlet 1, set in its side wall
There is altitude valve 2, can adjust the height of water level in supply tank by opening different altitude valves 2, realize adjustment examination
The size of infiltration energy during testing；Supply tank 12 is connected by water inlet pipe 3 with the bottom of transparent mould molding box 9, is set in water inlet pipe 3
There is feed pipe water valve 13；Transparent liquid has the n-dodecane and white oil of identical mass ratio in injection and transparent native 10 in supply tank 12
Mixed solution.
5th step：Laser 11 employed in the front-right placement laser 11 of transparent mould molding box 9, this example is half
Conductor sheet laser, using intracavity He-Ne laser, power 2V, and it is furnished with converter,linear, spot light can be converted into line
Property light source.Laser 11 is opened, and adjusts its particular location, it is directed at the transparent native bottom of foundation ditch in transparent mould molding box 9, shape
Into speckle field；Laser in this example is vertical with the alien invasion of transparent mould molding box 9 at a distance of 450mm.
6th step：CCD camera 5 employed in the front of transparent mould molding box 9 placement CCD camera 5, this example is moral
State's Basler products (scA1600-14fm)；CCD camera 5 is opened, and adjusts the height and angle of its support so that CCD camera 5
Camera lens perpendicular alignmnet transparent mould molding box 9 alien invasion, ensure that its visual range can include the bottom in whole transparent soil matrix hole；
CCD camera 5 is connected with computer 4, sets CCD camera 5 with the frequency collection image of 2 width/second and to be sent to computer 4.
7th step：A certain altitude valve 2 is opened in head control system so that oozing in whole head control system
Permeable head keeps constant during experiment.
8th step：Open water inlet pipe water valve 13 so that have in head control system with transparent liquid in transparent native 10 identical
The n-dodecane of mass ratio and the mixed solution of white oil rush after passing sequentially through water inlet pipe 3, multilayer cobble 7 into see-through model case 9
Transparent native bottom of foundation ditch is hit, in the process by the data transfer detected by flowmeter 14 and pressure-measuring pipe 6 to computer 4.
9th step：After the completion of the seepage failure of transparent soil matrix hole, the infiltration obtained is analyzed by computer image processing technology
Picture is destroyed, obtains during seepage failure the development of soil particle riding chain and the process developed in transparent soil matrix hole at different moments；This
Computer-processing software employed in example is DIC；It is finally completed the observation of campshed supporting foundation pit seepage failure evolution.
This example one is simulating campshed supporting saturation cohesive soil foundation ditch seepage failure evolution.
Example two：
The first step：First, according to the size of experimental condition and sample calculate needed for perfluor cyclic polymerization composition granule and
The dosage of calcium bromide solution, on the premise of environment temperature described in guarantee test is constant, by deployed sodium bromide solution one
Determine at temperature (in this example be 24 DEG C) to be slowly fitted into transparent mould molding box, then by perfluor cyclic polymerization composition granule it is uniform, divide
Pour into scatteredly in transparent mould molding box, be stirred continuously in toppling process with glass bar and exclude bubble until soil sample homogeneous transparent, is prepared
Into transparent native the 10 of simulation saturated sand.
Second step, the 3rd step are the same as example one.
4th step：A kind of experimental rig and test method for simulating campshed supporting foundation pit seepage failure evolution, including
Head control system, supply tank 12 is provided with head control system, the top of supply tank 12 is provided with water inlet 1, set in its side wall
There is altitude valve 2, can adjust the height of water level in supply tank by opening different altitude valves 2, realize adjustment examination
The size of infiltration energy during testing；Supply tank 12 is connected by water inlet pipe 3 with the bottom of transparent mould molding box 9, is set in water inlet pipe 3
There is feed pipe water valve 13；The transparent calcium bromide solution of transparent liquid identical in injection and transparent native 10 in supply tank 12.
5th step, the 6th step, the 7th step are the same as example one.
8th step：Open water inlet pipe water valve 13 so that saturating with transparent liquid identical in transparent native 10 in head control system
Bright calcium bromide solution passes sequentially through impacts transparent native bottom of foundation ditch after water inlet pipe 3, multilayer cobble 7 into see-through model case 9, herein
During by the data transfer detected by flowmeter 14 and pressure-measuring pipe 6 to computer 4.
9th step is the same as example one.
This example two is simulating campshed supporting saturation cohesive soil foundation ditch seepage failure evolution.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
Present invention specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, not
On the premise of departing from present inventive concept, some simple deductions can also be made and replaced, should all be considered as belonging to the guarantor of the present invention
Protect scope.
Claims (6)
1. the invention discloses a kind of experimental rig for simulating campshed supporting foundation pit seepage failure evolution, including head control
System and foundation ditch analogue means.Head control system is connected by feed pipe with see-through model bottom portion, see-through model bottom portion
Multilayer cobble is laid, transparent soil is placed above multilayer cobble；Excavation forms foundation ditch after campshed is inserted in the transparent soil body so that row
The insertion depth of stake is more than foundation depth；Lay laser in the outside of transparent mould molding box；Lay CCD phases in the outside of transparent mould molding box
Machine, it is equidistant in transparent soil matrix hole to lay pore pressure measurement apparatus.
A kind of 2. test method for simulating campshed supporting foundation pit seepage failure evolution, it is characterised in that：Utilize laser section
The transparent soil for squeezing into bottom of foundation ditch forms speckle field, adjusts head control system, when osmotic fluid is through multilayer cobble impact base
During cheating the transparent soil in bottom, the speckle field is continuously shot by CCD camera, utilizes Computer Image Processing software pair afterwards
The speckle field of acquisition is analyzed, and the development of soil particle riding chain and the process developed in transparent soil is obtained, to further investigate campshed branch
The mechanism of bottom of foundation ditch seepage failure provides foundation under the conditions of shield.
3. a kind of experimental rig for simulating campshed supporting foundation pit seepage failure evolution according to claim 1, it is special
Sign is：The transparent soil body of described saturation is using baking quartz sand particle with having the n-dodecane of identical refractive index and white oil
Mixed solution prepares to be formed.
4. a kind of experimental rig for simulating campshed supporting foundation pit seepage failure evolution according to claim 1, it is special
Sign is：Supply tank is provided with the head control system, have in supply tank has identical mass ratio with transparent liquid in transparent soil
N-dodecane and white oil mixed solution.
5. a kind of experimental rig for simulating campshed supporting foundation pit seepage failure evolution according to claim 1, it is special
Sign is：Described campshed uses a diameter of 5mm-10mm rod iron, using the method for interval pile sinking in pile driving process, with mould
Intend construction technology live under full-scale condition.
6. a kind of test method for simulating campshed supporting foundation pit seepage failure evolution according to claim 2, it is special
Sign is：The application method of the experimental rig, including following technical step：
1) the transparent soil of relevant parameter has been configured by test requirements document, has been poured into transparent mould molding box；
2) after campshed vertically squeezes into transparent soil successively according to the requirement of interval pile, campshed is enclosed into the soil body using soil sampler and delayed
Slowly dig out, ensure that formed bottom of foundation ditch is smooth, the building-in depth of campshed is more than 0.5 times of foundation depth；
3) injection has the pore-fluid of identical refractive index with transparent soil in supply tank；
4) laser is opened, examines its angle that become clear in the particle section that transparent soil is internally formed, and adjust the angle of laser section
Degree, make the bottom in the transparent soil matrix hole of section vertical incidence, form bright speckle field；
5) open CCD camera and adjust its visual range, the bottom in whole transparent soil matrix hole can be included, camera is kept certainly
Dynamic exposal model, and it is set with the frequency collection image of 2 width/second and is sent to computer.
6) a certain altitude valve is opened in head control system so that the infiltration energy in whole head control system is trying
Kept during testing constant；
7) open water inlet pipe water valve, the osmotic fluid in head control system pass sequentially through enter after water inlet pipe, multilayer cobble it is saturating
Bright model casing impacts transparent native bottom of foundation ditch, in the process by the data transfer detected by flowmeter and pressure-measuring pipe to calculating
Machine；
8) after the completion of the seepage failure of transparent soil matrix hole, the seepage failure obtained is analyzed by computer image processing technology DIC
Picture, obtain during seepage failure the development of soil particle riding chain and the process developed in transparent soil matrix hole at different moments.
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| CN110702584A (en) * | 2019-10-28 | 2020-01-17 | 山东大学 | Measuring device and measuring method for permeability of porous material and application |
| CN111060435A (en) * | 2019-12-10 | 2020-04-24 | 太原理工大学 | Device and method for well-point dewatering underground water seepage law test |
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