CN108508189A - Seepage field and oscillator field coupling lead to the experimental rig and method of foundation pit destruction - Google Patents
Seepage field and oscillator field coupling lead to the experimental rig and method of foundation pit destruction Download PDFInfo
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- CN108508189A CN108508189A CN201810608556.7A CN201810608556A CN108508189A CN 108508189 A CN108508189 A CN 108508189A CN 201810608556 A CN201810608556 A CN 201810608556A CN 108508189 A CN108508189 A CN 108508189A
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Abstract
The invention discloses experimental rigs and method that seepage field and oscillator field coupling lead to foundation pit destruction, experimental rig includes foundation pit simulation system, supporting simulation system, water supply and sewerage pipeline simulation system, loading system and electric impedance imaging system, foundation pit simulation system simulates the pavement of road of foundation pit and closing foundation ditch, supporting simulation system simulates different foundation pit supporting constructions, the leakage of water supply and sewerage pipeline and pipeline have pressure or without pressure in the water supply and sewerage pipeline simulation system simulation soil body, loading system simulating vehicle oscillatory load, electric impedance imaging system records inside soil body three-dimensional scence, empty Evolution Mechanism in analytical soil sample.The experimental rig simulates the leakage of water supply and sewerage pipeline and pipeline in the soil body by water supply and sewerage pipeline simulation system has pressure or without pressure, by loading system simulating vehicle oscillatory load, the influence destroyed to foundation pit under the coupling of seepage field and oscillator field can be simulated by the combination of the two.
Description
Technical field
The present invention relates to geotechnical engineering field is related to, cause foundation pit broken more particularly, to seepage field and oscillator field coupling
Bad experimental rig and method.
Background technology
With China's rapid development of economy, urban land is more nervous, and accelerating the exploitation of urban underground space, gesture has not been
It can keep off.In intensive city space, base pit engineering is usually close to traffic main artery, the vibration meeting pair of seething vehicle generation
Base pit stability has an impact；Also there is complicated municipal pipeline more in foundation pit periphery, due to construction wrong etc., can cause to
Drainage pipeline rupture leak also results in soil strength and is greatly reduced, to foundation pit to induce the generation of Hidden Soil Cavity under earth's surface
Stability and surrounding enviroment have an immense impact on, and the foundation pit accident of multiple unstable failures due to such reason has occurred in China.It can
See, under research Traffic loading and water supply and sewerage pipeline leak synergy, the Hidden Soil Cavity rule of development and its caused foundation pit
Soil deformation mechanism is of great significance with foundation pit failure mechanism.
Excavation of foundation pit causes the differential settlement that foundation pit circumferentially descends water supply and sewerage pipeline ground, or barbarous construction is directly broken
It is broken underground water supply and drainage pipeline, leads to pipeline breaking leak.The tube circumference soil body is impregnated by percolating water, and soil strength declines.It oozes
Leak seepage flow in the soil body drives soil body particle migration.Soil strength declines and soil body particle migration leads to underground Hidden Soil Cavity
Generation.Earth's surface road vehicle dynamic load causes the underground soil body to vibrate, the expansion of soil cave is exacerbated, so as to cause base
The destruction in hole and surrounding enviroment.What existing experimental rig was studied more is the influence that soil cave road pavement collapses, and there has been no experimental rigs
Influence of the Hidden Soil Cavity caused by pipe leakage to base pit stability can be studied；Pipe leakage leads to the generation of soil cave, vehicle dynamic
Load can aggravate the development of soil cave, there has been no experimental rig it can be considered that oscillator field and leakage field coupling.Thus develop mould
Hidden Soil Cavity development and its experimental rig that foundation pit destroys is led under quasi- seepage field and oscillator field coupling particularly urgently and again
It wants.
Invention content
The present invention provides experimental rigs and method that seepage field and oscillator field coupling lead to foundation pit destruction, overcome
The existing deficiency of background technology.
The present invention solves one of used technical solution of its technical problem：
Seepage field and oscillator field coupling lead to the experimental rig that foundation pit destroys, it is characterised in that：It includes：Foundation pit mould
Quasi- system, supporting simulation system, water supply and sewerage pipeline simulation system, loading system and electric impedance imaging system, foundation pit simulation system
The pavement of road of foundation pit and closing foundation ditch is simulated, supporting simulation system simulates different foundation pit supporting constructions, water supply and sewerage pipeline mould
The leakage of water supply and sewerage pipeline and pipeline have pressure or without pressure in the quasi- system simulation soil body, loading system simulating vehicle oscillatory load,
Empty Evolution Mechanism in electric impedance imaging system record inside soil body three-dimensional scence, analytical soil sample.
Among one preferred embodiment：Foundation pit simulation system includes organic glass box, experiment soil sample and road deck, organic glass
Testing foundation ditch and the experiment soil sample positioned at testing foundation ditch bottom is arranged in side in case, and the other side is filled up in organic glass case
Soil sample is tested, road deck is covered in the experiment soil sample top surface of the side.
Among one preferred embodiment：Electric impedance imaging system includes power supply, foreign current generator, computer, Arduino micro-
Controller, multiplexer, digital collection equipment and multiple electrodes pipe, computer control multichannel by Arduino microcontrollers and answer
With device, multiplexer connects multiple electrodes pipe, and digital collection equipment connection electrode pipe and computer, electrode tube pass through hollow conductive
Glass tube is inserted into the experiment soil sample below road deck, and foreign current generator applies current field, number to a wherein electrode tube
Word collecting device acquires the voltage signal of other electrode tubes generation and is delivered to computer, and computer obtains tomograph by inversion algorithm
Picture.
Among one preferred embodiment：Road deck includes the first laminate and the second laminate of upper and lower fitting arrangement, the first laminate
For concrete slab or bituminous concrete plate, the second laminate is metalling.
Among one preferred embodiment：Water supply and sewerage pipeline simulation system includes water pump, booster pump, pipe pressure sensor, stream
Gauge, silicone tube, pvc pipe and liquid reserve tank, silicone tube both ends are connected with water pump and booster pump respectively, booster pump and pvc pipe into
Water end (W.E.) is connected, and pvc pipe passes through the experiment soil sample below the road deck of organic glass case and its water outlet is connected with liquid reserve tank,
Flowmeter is mounted at the water inlet end of pvc pipe, and pipe pressure sensor is mounted on pvc pipe water inlet end and water outlet, and pvc pipe is opened
Equipped with the different leakage hole of shape, size, quantity, leakage hole is located in the experiment soil sample below road deck.
Among one preferred embodiment：The load that loading system includes loading frame, the panel that satisfies the need is loaded is hammered into shape, is hammered into shape for load
There is provided the servo-pressing machine of power and for maxium load value, loading velocity, loading frequency to be arranged to control servo-pressing machine drive
Dynamic load hammer loads out the controller of digital controlled machine tool of triangular waveform dynamic load, and servo-pressing machine is mounted on loading frame, load hammer axis
It is installed in loading frame and drive connection servo-pressing machine to activity, the bottom surface for loading hammer is corresponding with road deck.
Among one preferred embodiment：Load hammer number is set as three and is arranged side by side, the bottom surface and road surface of three load hammers
Plate coincides, and servo-pressing machine number is set as three and connects one to one with three load hammers.
Among one preferred embodiment：Further include particle picture test system, it include four digital cameras and computer, four
Platform digital camera is arranged in the front of organic glass case peripheric surface, and organic glass case peripheric surface posts transparent uniform
It is disposed with the glassine paper of black dot, digital camera shoots picture and by each pixel movement in computer recordable picture
Pixel position simultaneously combines the black dot of glassine paper to converse displacement of each pixel under cartesian coordinate system to observe and remember
It records the deformation of supporting construction and the soil body, reproduce foundation pit destruction evolution.
Among one preferred embodiment：Further include consolidating for what is analyzed the solid particle in pvc pipe water outlet liquid
Body particle analysis system, it includes laser particle analyzer and grain count instrument, and laser particle analyzer is used to measure the grain size of solid particle,
Grain count instrument is for counting amounts of particles.
Among one preferred embodiment：Supporting simulation system includes waddy, batten, fine steel rib, finer wire, syringe, cement
Slurries, rubber tube, waddy simulate campshed, and batten simulates Guan Liang, waist rail, and fine steel rib simulates soil nailing, and finer wire simulates the steel of anchor cable
Twisted wire, syringe and cement grout, rubber tube simulate slip casting.
The present invention solve the used technical solution of its technical problem second is that：Seepage field and oscillator field coupling are led
The test method for causing foundation pit to destroy, it is characterised in that：
Step 10, jack and hollow conductive glass tube are preset in organic glass case, and fills up examination into organic glass case
Soil sample is tested, it is appropriate to tamp；According to test objective, the road deck of unlike material is selected, then road deck is laid on organic glass case
In the experiment soil sample of interior side；
Step 20, the installation of water supply and sewerage pipeline simulation system：Leakage hole size, shape, quantity are selected according to test objective
Pvc pipe is passed through organic glass case and pvc pipe to be located at immediately below road deck by different pvc pipes by jack, then by water pump, increasing
Press pump, pipe pressure sensor, flowmeter, silicone tube and liquid reserve tank carry out installation and connect；
Step 30, the installation of electric impedance imaging system：Electrode tube is inserted into hollow conductive glass tube, then by power supply, outside
Current feedback circuit, computer, Arduino microcontrollers, multiplexer, digital collection equipment carry out installation connection；
Step 40, the installation of loading system：Loading frame, load hammer, servo-pressing machine and controller of digital controlled machine tool are carried out
Installation, so that load hammer bottom surface face road deck；
Step 50, different supporting construction is selected according to test objective；
Step 60, simulating excavation：The experiment soil sample of side in organic glass babinet is excavated to form testing foundation ditch, is cheated
There are experiment soil samples at bottom, and the soil sample of organic glass box inside wall is removed totally；
Step 70, pipe leakage is simulated：Water pump is opened, booster pump is adjusted, to supercharging in pvc pipe, is passed by pipeline pressure
Sensor observes overpressure numerical value, adjusts flowmeter and pipeline flow is arranged；
Step 80, simulating vehicle dynamic load：Use number and the position that load hammer is selected according to test objective, open servo
Forcing press is arranged maximum load load, loading velocity, load interval by controller of digital controlled machine tool, is hammered into shape and carried out with drive load
The load of triangular waveform load；
Step 90, analysis is observed by electric impedance imaging system：Foreign current generator is set, at regular intervals
Current field is applied to experiment soil sample by a certain electrode tube, and by computer record inside soil body three-dimensional scence, in analytical soil sample
Hole Evolution Mechanism；
System, which is tested, by particle picture is observed analysis：Digital camera carries out picture shooting record at regular intervals
The pixel position of each pixel movement on picture, and converse each picture by the black dot of computer program combination glassine paper
Displacement of the vegetarian refreshments under cartesian coordinate system was developed with observing and recording the deformation of supporting construction and the soil body, reproducing foundation pit destruction
Journey analyzes foundation pit failure mechanism.It is observed analysis by solid particle analysis system：It is drained at regular intervals in pvc pipe
Mouth is sampled with container, then the grain size and quantity of solid particle are measured by laser particle analyzer, grain count instrument, to analyze leakage
The influence that size, shape, the quantity in water hole are lost in its periphery grogs.
Among one preferred embodiment：In step 30, by electrode tube be inserted into hollow conductive glass tube when, electrode bottom of the tube with
Hollow conductive glass bottom of the tube does not contact, and is fixed on hollow conductive glass tube with watertight plastic cap at the top of electrode tube.
Compared with the background art, it has the following advantages that the technical program：
1. the experimental rig simulates the leakage and pipeline of water supply and sewerage pipeline in the soil body by water supply and sewerage pipeline simulation system
There is pressure or without pressure, by loading system simulating vehicle oscillatory load, seepage field and oscillator field can be simulated by the combination of the two
The influence that foundation pit is destroyed under coupling；And electric impedance imaging system can record inside soil body three-dimensional scence, in analytical soil sample
Empty Evolution Mechanism, the system be a kind of improvement, simplify, low energy consumption, precision controlling flexibly, be suitable for laboratory scale
The anti-imaging system of three-dimensional resistance, be particularly suitable for reproduce the soil body inside scene, three-dimensional space in the high-precision soil body can be obtained
Hole image.
2. electric impedance imaging system is the technology for being imaged conductive material electrical resistivity property, pass through foreign current generator
Current field is applied to experiment soil sample by a certain electrode tube at regular intervals, then other are passed through using the acquisition of digital collection equipment
The voltage for the experiment soil sample that electrode tube measures simultaneously is delivered to computer, and computer obtains faultage image by inversion algorithm.
3. booster pump can adjust the pressure in pvc pipe, then pass through the pressure value in pipe pressure sensor detection pipe；And it is logical
The uninterrupted in flowmeter setting pvc pipe is overregulated, it can truer simulation by changing overpressure and uninterrupted
The water leakage situation of water supply and sewerage pipeline so that the result that the experimental rig obtains is more accurate.
4. load hammer number is set as three and is arranged side by side, the bottom surface of three load hammers coincides with road deck, can basis
The use number of the selected load hammer of test objective, such as experiment single-point vibrate the influence to foundation pit, then a load are used to hammer into shape；Such as examination
Influence of the multiple spot vibration to foundation pit is tested, then 2 or 3 loads is used to hammer into shape.
5. digital camera shoots picture and by the pixel position of each pixel movement in computer recordable picture and combines
The black dot of glassine paper converse displacement of each pixel under cartesian coordinate system with observe and record supporting construction and
The deformation of the soil body reproduces foundation pit destruction evolution so that particle picture test system can obtain high-precision, quantitative foundation pit
Destroy evolution image.
6. the grain size and quantity of solid particle are measured by laser particle analyzer, grain count instrument, to analyze the big of leakage hole
The influence that small, shape, quantity are lost in its periphery grogs, can further observe the influence that seepage effect destroys foundation pit.
It, can be real 7. supporting simulation system includes waddy, batten, fine steel rib, finer wire, syringe, cement grout, rubber tube
Now simulate three kinds of soil-nail wall support, cantilever soldier pile retaining structure, anchor cable campshed combined supporting different supporting construction.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 depicts the overall structure diagram of the experimental rig of a preferred embodiment.
Fig. 2 depicts the A-A schematic cross-sectional views of Fig. 1.
Fig. 3 depicts the B-B schematic cross-sectional views of Fig. 1.
Fig. 4 depicts the assembling schematic diagram of electrode tube and hollow conductive glass tube.
Fig. 5 depicts the schematic cross-sectional view of soil nailed wall retaining structure.
Fig. 6 depicts the schematic cross-sectional view of cantilever soldier pile retaining structure.
Fig. 7 depicts the schematic cross-sectional view of anchor cable campshed combined retaining structure.
Specific implementation mode
The present invention is based on least favorable situation is considered, ignore the three-dimensional effect of foundation pit, simulation is that foundation pit closes on road and ground
The a line of underground pipelines situation complexity.
Fig. 1 to Fig. 7 is please referred to, seepage field and oscillator field coupling lead to a preferable reality of the experimental rig of foundation pit destruction
Example is applied, the seepage field and oscillator field coupling lead to the experimental rig that foundation pit destroys, it includes foundation pit simulation system, branch
Protect simulation system, water supply and sewerage pipeline simulation system, loading system and electric impedance imaging system.
Foundation pit simulation system simulates the pavement of road of foundation pit and closing foundation ditch.
In the present embodiment, foundation pit simulation system includes organic glass box 10, experiment soil sample 13 and road deck 11, organic glass
Testing foundation ditch 12 and the experiment soil sample positioned at 12 bottom of testing foundation ditch is arranged in side in case 10, and the other side is in organic glass case
The experiment soil sample 13 filled up, road deck 11 are covered in 13 top surface of experiment soil sample of the side.
In the present embodiment, organic glass case 10 is the square that length, width and height are 2m, in being passed through with five poly (methyl methacrylate) plates
Property glass glue bond constitute, open top.
In the present embodiment, as shown in Figure 1, testing foundation ditch is arranged in the left side of organic glass case 10, testing foundation ditch road is set
It sets on the right side of organic glass case 10.Two side faces are equipped with jack before and after organic glass case 10, and jack is located at 11 lower section of road deck,
Jack number can be set as multiple and upper and lower arranged for interval.The right side of organic glass case 10 offers through hole, and through hole is equipped with
Three rows, often row's setting 3-15 differ, and in the present embodiment, often arrange through hole there are three setting.It is not closed transparent to be additionally provided with both ends
Hollow conductive glass tube 14,14 numbers of glass tube are identical as through hole number and correspond, in the present embodiment, hollow conductive
The diameter of glass tube 14 is set as 6mm, the glass tube 14 by through hole be inserted into experiment soil sample 13 in, and by neutral density glass glue with
The poly (methyl methacrylate) plate of the side is mutually fixed.
In the present embodiment, road deck 11 includes the first laminate and the second laminate of fitting arrangement up and down, and the first laminate is mixed
Concrete board or bituminous concrete plate and its thickness are set as 20mm, and the second laminate is metalling and its thickness is set as 40mm.According to examination
Needs are tested, rigid pavement is such as tested, then use the road deck of concrete slab and metalling, if experiment flexible pavement, using drip
The road deck of green concrete slab and metalling.
The leakage of water supply and sewerage pipeline and pipeline have pressure or without pressure in the water supply and sewerage pipeline simulation system simulation soil body.This implementation
In example, water supply and sewerage pipeline simulation system includes water pump 20, booster pump 21, pipe pressure sensor 22, flowmeter 23, silicone tube
24, pvc pipe 25 and liquid reserve tank 26,24 both ends of silicone tube are connected with water pump 20 and booster pump 21 respectively；Booster pump 21 and pvc pipe
25 water inlet ends are connected, and the pressure limit applied is 0-0.5Mpa；Pvc pipe 25 passes through the experiment soil sample 13 of organic glass case 10
And its water outlet is connected with liquid reserve tank 26；Flowmeter 23 is mounted at the water inlet end of pvc pipe 25, and water velocity is adjusted, and
It can accurately measure the flow of unit interval；Pipe pressure sensor 22 set there are two and be separately mounted to 25 water inlet end of pvc pipe and
Water outlet namely two pipe pressure sensors 22 are located at front and back two sides of organic glass case 10；And pvc pipe 25 is equipped with more
A different pvc pipe, each pvc pipe offers shape or size or the different leakage hole of quantity, leakage hole are located under road deck
In the experiment soil sample 13 of side.
In the present embodiment, as shown in Figure 1, road is inserted into 25 water outlet of pvc pipe from the jack of the trailing flank of organic glass case 10
In the experiment soil sample 13 of below the panel, and the jack of the leading flank from organic glass case 10 is pierced by and is connected again with liquid reserve tank 26.
Due to arranged for interval above and below jack so that pvc pipe 25 can need the position for selecting jack to be inserted into according to experiment.Pvc pipe 25
Outer diameter may be configured as 15mm, 20mm, 40mm, and pvc pipe wall thickness can be set as 1mm, 1.5mm, 2.5mm.
Supporting simulation system simulates different foundation pit supporting constructions.
In the present embodiment, supporting simulation system includes waddy, batten, fine steel rib, finer wire, syringe, cement grout, rubber
Sebific duct, waddy simulate campshed, and batten simulates Guan Liang, waist rail, and fine steel rib simulates soil nailing, and finer wire simulates the steel strand wires of anchor cable, note
Emitter and cement grout, rubber tube simulate slip casting.
As shown in figure 5, the fine steel rib 70 for choosing a diameter of 2mm is inserted into experiment soil sample, the insertion angle of fine steel rib 70 is
20 degree, the level interval of adjacent fine steel rib 70 and vertical spacing are 150mm, then choose the finer wire braiding of a diameter of 0.5mm
At the bar-mat reinforcement and setting of 25mm*25mm grids in slope surface, cement grout is painted, soil-nail wall support is simulated；Alternatively, such as Fig. 6 institutes
Show, choose round log rod 71, selects the round log rod 71 of tri- kinds of specifications of a diameter of 60mm, 80mm, 100mm to be spaced and be inserted into experiment soil sample
In, and level interval is respectively 100mm, 140mm, 180mm, 71 bottom end of round log rod is inserted to foundation pit surface or less the depths 250mm, institute
There is 71 top of round log rod of insertion to be fixed with the splint of width 60mm, thickness 10mm, splint hammers into 71 top of round log rod with nail,
The cantilever soldier pile retaining structure of three kinds of piles with different diameter piles with different spacing is simulated respectively；Alternatively, choosing the round log rod of a diameter of 18mm towards examination
The drilling of soil sample 13 is tested, bore angle is 20 °, and the finer wire for choosing 5 diameter 0.2mm is twisted wire together with slip casting rubber tube
It penetrates in drilling, wherein steel wire line length 1000mm, one section of wire 500mm is wrapped up with preservative film, and remaining section does not have to package, is protected
One section of fresh film package is placed on drilling side outwardly, injects cement grout with syringe, and rubber tube is pulled out on marginal not slurry side outward, until
Drilling is filled, the anchor cable 72 of free segment 5m, anchoring section 5m, anchoring section diameter 180mm are simulated, as shown in fig. 7, in wide 60mm, thickness
A hole is opened at interval of 150mm on the splint of 10mm, free section of anchor cable one end of simulation is inserted in the hole, is used in combination seccotine solid
It is scheduled on splint, splint nails on 71 top of round log rod of simulation campshed, simulates anchor cable campshed combined supporting.
Loading system simulating vehicle oscillatory load.
In the present embodiment, the load that loading system includes loading frame 30, the panel 11 that satisfies the need is loaded is hammered 31 into shape, is hammered into shape for load
31 provide the servo-pressing machine of power and for maxium load value, loading velocity, loading frequency to be arranged to control servo-pressing machine
Drive load hammers the controller of digital controlled machine tool for loading out triangular waveform dynamic load into shape, and servo-pressing machine is mounted on loading frame 30, load
The axial activity of hammer 31 is installed in loading frame 30 and drive connection servo-pressing machine, and the bottom surface of load hammer 31 is opposite with road deck 11
It answers.
In the present embodiment, load 31 numbers of hammer are set as three and are arranged side by side, and 31 bottom surface and road deck is hammered in three loads into shape
11 coincide, and servo-pressing machine number is set as three and connects one to one with three load hammers 31.Controller of digital controlled machine tool is set
Axial compressive force ranging from 10-100KN, the loading frequency ranging from 1-20Hz for setting 31 load of load hammer, to realize that triangular waveform is dynamic
The load purpose of load.
Empty Evolution Mechanism in electric impedance imaging system record inside soil body three-dimensional scence, analytical soil sample.
In the present embodiment, electric impedance imaging system includes power supply, foreign current generator 40, computer 41, Arduino micro-controls
Device, multiplexer, digital collection equipment and multiple electrodes pipe 42 processed, computer 41 control multichannel by Arduino microcontrollers
Multiplexer, multiplexer connect multiple electrodes pipe 42, digital collection equipment connection electrode pipe 42 and computer 41, and electrode tube 42 is logical
It crosses hollow conductive glass tube 14 to be inserted into experiment soil sample 13, foreign current generator is by a wherein electrode tube 42 to experiment soil
Sample 13 applies current field, and digital collection equipment acquires the voltage signal for the generation of experiment soil sample 13 that other electrode tubes 42 measure and defeated
It send to computer 41, computer 41 obtains faultage image by inversion algorithm.
In the present embodiment, 42 numbers of electrode tube are identical as 14 numbers of hollow conductive glass tube and correspond, and electrode tube is straight
Diameter is set as 5mm and is inserted into glass tube 14 one by one.42 bottom of electrode tube is not contacted with 14 bottom of hollow conductive glass tube, electrode tube
42 top watertight plastic caps 43 are fixed on hollow conductive glass tube 14.
Electric impedance imaging system can record inside soil body three-dimensional scence, empty Evolution Mechanism in analytical soil sample, which is
A kind of improvement, simplifying, low energy consumption, precision controlling flexibly, suitable for the anti-imaging system of three-dimensional resistance of laboratory scale,
It is particularly suitable for reproducing the inside scene of the soil body, three-dimensional cavity image in the high-precision soil body can be obtained.
In the present embodiment, which further includes particle picture test system, it includes four digital cameras 50 and meter
Calculation machine, four digital cameras 50 are arranged in the front of 10 peripheric surface of organic glass case, and 10 peripheric surface of organic glass case is equal
The transparent glassine paper for being evenly arranged black dot is posted, digital camera 50 shoots picture and by computer recordable picture
The pixel position of each pixel movement simultaneously combines the black dot of glassine paper to converse each pixel under cartesian coordinate system
Displacement with observe and record supporting construction and the soil body deformation, reproduce foundation pit destroy evolution.
In the present embodiment, which further includes for dividing the solid particle in 25 water outlet liquid of pvc pipe
The solid particle analysis system of analysis, it includes laser particle analyzer 60 and grain count instrument 61, and laser particle analyzer 60 is solid for measuring
The grain size of body particle, laser particle analyzer 60, which is irradiated to by light on particle, can occur scattering, diffraction, its diffraction, scattered light intensity
Degree principle related with the size of particle measures analysis；Grain count instrument 61 is used to count amounts of particles,
It is counted by light blockage method.
In the present embodiment, which further includes testing soil for measuring the round log rod surface of cantilever soldier pile retaining structure
The micro pressure meter of sample pressure, the micro pressure meter are equally spacedly attached to round log rod surface.The micro pressure meter passes through electric-resistivity method
The pressure size of experiment soil sample is measured, with the distribution situation of observation experiment soil sample pressure and acts on pressure in supporting construction
Power size and its variation.
The experimental rig simulates the leakage of water supply and sewerage pipeline and pipeline in the soil body by water supply and sewerage pipeline simulation system to be had
Pressure can simulate the coupling of seepage field and oscillator field by the combination of the two without pressure by loading system simulating vehicle oscillatory load
The lower influence that foundation pit is destroyed of cooperation.
Seepage field and oscillator field coupling lead to the test method that foundation pit destroys, it includes：
Step 10, jack and hollow conductive glass tube 14 are preset in organic glass case 10, and into organic glass case 10
Experiment soil sample is filled up, it is appropriate to tamp；According to test objective, the road deck 11 of unlike material is selected, then road deck 11 is laid on
In organic glass case 10 in the experiment soil sample of side；
Step 20, the installation of water supply and sewerage pipeline simulation system：Leakage hole size, shape, quantity are selected according to test objective
Pvc pipe 25 is passed through organic glass case 10 and pvc pipe 25 to be located at immediately below road deck 11 by different pvc pipes 25 by jack, then
Water pump 20, booster pump 21, pipe pressure sensor 22, flowmeter 23, silicone tube 24 and liquid reserve tank 26 are carried out installation to connect；
Step 30, the installation of electric impedance imaging system：Electrode tube 42 is inserted into hollow conductive glass tube 14, then by power supply,
Foreign current generator 40, computer 41, Arduino microcontrollers, multiplexer, digital collection equipment carry out installation connection；
In the present embodiment, in step 30, when electrode tube 42 is inserted into hollow conductive glass tube 14,42 bottom of electrode tube and hollow conductive
14 bottom of glass tube does not contact, and 42 top watertight plastic cap 43 of electrode tube is fixed on hollow conductive glass tube 14.
Step 40, the installation of loading system：By loading frame 30, load hammer 31, servo-pressing machine and controller of digital controlled machine tool
It is installed, so that load 31 bottom surface face road decks 11 of hammer；
Step 50, different supporting construction is selected according to test objective；In the present embodiment, supporting simulation system is selected as schemed
Cantilever soldier pile retaining structure shown in 6；
Step 60, simulating excavation：The experiment soil sample of side in organic glass babinet 10 is excavated to form testing foundation ditch
12, there are experiment soil samples at hole bottom, and the soil sample of 10 madial wall of organic glass babinet is removed totally；
Step 70, pipe leakage is simulated：Water pump 20 is opened, booster pump 21 is adjusted, to supercharging in pvc pipe 25, passes through pipeline
Pressure sensor 22 observes overpressure numerical value, adjusts flowmeter 23 and pipeline flow is arranged；
Step 80, simulating vehicle dynamic load：The use number of load hammer 31 and position, unlatching is selected to watch according to test objective
Take forcing press, maximum load load be arranged by controller of digital controlled machine tool, loading velocity, load are spaced, with drive load hammer into shape into
The load of row triangular waveform load；
Step 90, analysis is observed by electric impedance imaging system：Foreign current generator 40 is set, when one section
Between by a wherein electrode tube 42 to experiment soil sample 13 apply current field, and by computer 41 record inside soil body three-dimensional scence,
Analytical soil sample inside aperture Evolution Mechanism；
System, which is tested, by particle picture is observed analysis：Digital camera carries out picture shooting record at regular intervals
The pixel position of each pixel movement on picture, and converse each picture by the black dot of computer program combination glassine paper
Displacement of the vegetarian refreshments under cartesian coordinate system was developed with observing and recording the deformation of supporting construction and the soil body, reproducing foundation pit destruction
Journey analyzes foundation pit failure mechanism；
It is observed analysis by solid particle analysis system：At regular intervals 25 discharge outlet container of pvc pipe into
Row sampling, then by laser particle analyzer 60, the grain size and quantity of the measurement solid particle of grain count instrument 61, to analyze leakage hole
The influence that size, shape, quantity are lost in its periphery grogs.
In the present embodiment, in step 90, the round log rod of cantilever soldier pile retaining structure can be also measured by micro pressure meter
Soil sample pressure is tested on surface, with the distribution situation of observation experiment soil sample pressure and act on pressure size in supporting construction and
It changes.
The above, only present pre-ferred embodiments, therefore cannot limit the scope of implementation of the present invention according to this, i.e., according to
Equivalent changes and modifications made by the scope of the claims of the present invention and description all should still belong in the range of the present invention covers.
Claims (12)
1. seepage field and oscillator field coupling lead to the experimental rig that foundation pit destroys, it is characterised in that：It includes：Foundation pit is simulated
System, supporting simulation system, water supply and sewerage pipeline simulation system, loading system and electric impedance imaging system, foundation pit simulation system mould
The pavement of road of quasi- foundation pit and closing foundation ditch, supporting simulation system simulate different foundation pit supporting constructions, water supply and sewerage pipeline simulation
The leakage of water supply and sewerage pipeline and pipeline have pressure or without pressure, loading system simulating vehicle oscillatory load, electricity in the system simulation soil body
Empty Evolution Mechanism in impedance imaging system record inside soil body three-dimensional scence, analytical soil sample.
2. seepage field according to claim 1 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Foundation pit simulation system includes organic glass box, tests soil sample and road deck, and testing foundation ditch is arranged in side in organic glass case
And the experiment soil sample positioned at testing foundation ditch bottom, the other side is the experiment soil sample filled up, road deck covering in organic glass case
Experiment soil sample top surface in the side.
3. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Electric impedance imaging system includes power supply, foreign current generator, computer, Arduino microcontrollers, multiplexer, number
Word collecting device and multiple electrodes pipe, computer control multiplexer by Arduino microcontrollers, and multiplexer connection is more
A electrode tube, digital collection equipment connection electrode pipe and computer, electrode tube are inserted by hollow conductive glass tube under road deck
In the experiment soil sample of side, foreign current generator applies current field to a wherein electrode tube, and digital collection equipment acquires other electricity
The voltage signal of pole pipe generation is simultaneously delivered to computer, and computer obtains faultage image by inversion algorithm.
4. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Road deck includes the first laminate and the second laminate of upper and lower fitting arrangement, and the first laminate is concrete slab or pitch coagulation
Native plate, the second laminate are metalling.
5. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Water supply and sewerage pipeline simulation system includes water pump, booster pump, pipe pressure sensor, flowmeter, silicone tube, pvc pipe and storage
Liquid case, silicone tube both ends are connected with water pump and booster pump respectively, and booster pump is connected with pvc pipe water inlet end, and pvc pipe, which passes through, to be had
Experiment soil sample and its water outlet below the road deck of machine glass box are connected with liquid reserve tank, flowmeter be mounted on pvc pipe into
At water end (W.E.), pipe pressure sensor is mounted on pvc pipe water inlet end and water outlet, and to offer shape, size, quantity equal for pvc pipe
Different leakage holes, leakage hole are located in the experiment soil sample below road deck.
6. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：The load that loading system includes loading frame, the panel that satisfies the need is loaded is hammered into shape, hammers the servo-pressing machine for providing power into shape for load
With for maxium load value, loading velocity, loading frequency to be arranged triangular wave is loaded out to control servo-pressing machine drive load hammer
The controller of digital controlled machine tool of shape dynamic load, servo-pressing machine are mounted on loading frame, the axial activity of load hammer be installed in loading frame and
Drive connection servo-pressing machine, the bottom surface for loading hammer are corresponding with road deck.
7. seepage field according to claim 6 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Load hammer number is set as three and is arranged side by side, and the bottom surface of three load hammers coincides with road deck, servo-pressing machine
Number is set as three and connects one to one with three load hammers.
8. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Further include particle picture test system, it includes four digital cameras and computer, and four digital cameras are arranged in
The front of organic glass case peripheric surface, organic glass case peripheric surface post the transparent glass for being evenly arranged black dot
Paper, digital camera shoot picture and by the pixel positions of each pixel movement in computer recordable picture and in conjunction with glassine paper
Black dot converses displacement of each pixel under cartesian coordinate system to observe and record the change of supporting construction and the soil body
Shape reproduces foundation pit destruction evolution.
9. seepage field according to claim 5 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Further include the solid particle analysis system for being analyzed the solid particle in pvc pipe water outlet liquid, it includes
Laser particle analyzer and grain count instrument, laser particle analyzer are used to measure the grain size of solid particle, and grain count instrument is used for particle
Quantity is counted.
10. seepage field according to claim 2 and oscillator field coupling lead to the experimental rig that foundation pit destroys, feature
It is：Supporting simulation system includes waddy, batten, fine steel rib, finer wire, syringe, cement grout, rubber tube, waddy simulation
Campshed, batten simulate Guan Liang, waist rail, and fine steel rib simulates soil nailing, and finer wire simulates the steel strand wires of anchor cable, syringe and cement mortar
Liquid, rubber tube simulate slip casting.
11. seepage field and oscillator field coupling lead to the test method that foundation pit destroys, it is characterised in that：
Step 10, jack and hollow conductive glass tube are preset in organic glass case, and fills up experiment soil into organic glass case
Sample, it is appropriate to tamp；According to test objective, the road deck of unlike material is selected, then road deck is laid on one in organic glass case
In the experiment soil sample of side；
Step 20, the installation of water supply and sewerage pipeline simulation system：Select leakage hole size, shape, quantity different according to test objective
Pvc pipe, pass through organic glass case and pvc pipe to be located at road deck underface by jack pvc pipe, then by water pump, booster pump,
Pipe pressure sensor, flowmeter, silicone tube and liquid reserve tank carry out installation and connect；
Step 30, the installation of electric impedance imaging system：Electrode tube is inserted into hollow conductive glass tube, then by power supply, foreign current
Generator, computer, Arduino microcontrollers, multiplexer, digital collection equipment carry out installation connection；
Step 40, the installation of loading system：Loading frame, load hammer, servo-pressing machine and controller of digital controlled machine tool are installed,
So that load hammer bottom surface face road deck；
Step 50, different supporting construction is selected according to test objective；
Step 60, simulating excavation：The experiment soil sample of side in organic glass babinet is excavated to form testing foundation ditch, hole bottom is stayed
There is experiment soil sample, and the soil sample of organic glass box inside wall is removed totally；
Step 70, pipe leakage is simulated：Water pump is opened, booster pump is adjusted, to supercharging in pvc pipe, passes through pipe pressure sensor
Overpressure numerical value is observed, flowmeter is adjusted and pipeline flow is set；
Step 80, simulating vehicle dynamic load：Use number and the position that load hammer is selected according to test objective, open servo pressure
Machine is arranged maximum load load, loading velocity, load interval by controller of digital controlled machine tool, is hammered into shape with drive load and carry out triangle
The load of waveform load；
Step 90, analysis is observed by electric impedance imaging system：Foreign current generator is set, is passed through at regular intervals
A wherein electrode tube applies current field to experiment soil sample, and passes through computer record inside soil body three-dimensional scence, analytical soil sample endoporus
Hole Evolution Mechanism；
System, which is tested, by particle picture is observed analysis：Digital camera carries out picture shooting recordable picture at regular intervals
The pixel position of upper each pixel movement, and converse each pixel by the black dot of computer program combination glassine paper
Displacement under cartesian coordinate system destroys evolution to observe and record the deformation of supporting construction and the soil body, reproduce foundation pit,
Analyze foundation pit failure mechanism；
It is observed analysis by solid particle analysis system：It is sampled at regular intervals with container in pvc pipe discharge outlet,
The grain size and quantity for measuring solid particle by laser particle analyzer, grain count instrument again, with analyze the size of leakage hole, shape,
The influence that quantity is lost in its periphery grogs.
12. seepage field according to claim 11 and oscillator field coupling lead to the test method that foundation pit destroys, special
Sign is：In step 30, when electrode tube being inserted into hollow conductive glass tube, electrode bottom of the tube and hollow conductive glass bottom of the tube
It does not contact, is fixed on hollow conductive glass tube with watertight plastic cap at the top of electrode tube.
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