CN109827883A - A kind of experimental rig and test method for simulating campshed supporting foundation pit stability study under deep-foundation pit engineering pipeline breaking operating condition - Google Patents
A kind of experimental rig and test method for simulating campshed supporting foundation pit stability study under deep-foundation pit engineering pipeline breaking operating condition Download PDFInfo
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Abstract
Stake supporting foundation pit stability under pipeline breaking operating condition is simulated in a kind of deep-foundation pit engineering and studies the experimental rig and test method of seepage characteristic under this operating condition, it is related to construction engineering technical field, described device includes simulation water system, simulate system for pit, data collection system, the simulation water system includes immersible pump (1), water tank (2), water supplying pipe (3), the simulation system for pit includes chamber (4) and pile supporting system, the side panel (7) of chamber (4) is equipped with pipeline tapping (8), pile supporting system is equipped in chamber (4), simulation breach is offered in the middle part of water supply pipeline section in chamber (4), the data collection system includes soil pressure cell, osmometer.By the simulation and test of the present apparatus, analyze influence under different seepage flow operating conditions to stake supporting foundation pit engineering, the seepage characteristic under the conditions of research deep basal pit seepage flow, and with practical combination, improve the safety of foundation pit supporting project.
Description
Technical field
The present invention relates to construction engineering technical fields, and in particular to simulates under pipeline breaking operating condition in a kind of deep-foundation pit engineering
Stake supporting foundation pit stability and the experimental rig and test method for studying seepage characteristic under this operating condition.
Technical background
Deep-foundation pit engineering refer to cutting depth be more than 5 meters (containing 5 meters) though or depth be less than 5 meters, geological conditions and week
Collarette border and the especially complex engineering of underground utilities.With the hair of China's urban population density being continuously increased with urban construction
The requirement that the underground space is urban sustainable development is reasonably develop and useedd in exhibition.It is all building or is preparing in each big city in China
Build underground engineering, the design and construction of deep-foundation pit engineering except need to guarantee the technology of deep-foundation pit engineering itself rationally and in addition to safety,
Also need to control the influence of its Construction on Environment.Since the history of China's deep-foundation pit engineering development is not grown, theoretical research backwardness and work
There is the accident of some base pit engineerings in recent years in the limitation of journey experience Personnel Skill Levels, China, many deep bases also occur
Hole engineering construction causes the case history of adverse effect to environment.
Foundation pit under the conditions of present China leads to seepage flow to water supply and sewerage pipeline rupture in the deep-foundation pit engineering of ground field is steady
The research of qualitative aspect is less, the current specifications in China, including local regulation does not provide clear stipulaties in this respect yet or refers to
Lead opinion.The adverse effect of strong Seepage in Pit Stability is not considered in engineering design yet.To track international cutting edge technology, filling out
Hidden danger of the current Chinese code of practice in the blank, reduction engineering in this region is mended, the present invention is directed to engineering pipeline rupture in a creative way
Base pit stability research under operating condition, by model test, each parameter is to base pit stability under analysis project pipeline breaking operating condition
Influence, provide foundation for later scientific research and engineering design.
Summary of the invention
The object of the present invention is to provide simulating in a kind of deep-foundation pit engineering, stake supporting foundation pit under underground piping rupture operating condition is steady
Qualitative experimental rig and method are analyzed under different seepage flow operating conditions by the simulation and test of the present apparatus to stake supporting foundation pit
Seepage characteristic under the conditions of the influence of engineering, research deep basal pit seepage flow, and with practical combination, improve the safety of foundation pit supporting project
Property.
The technical solution adopted is that:
The experimental rig of stake supporting foundation pit stability under pipeline breaking operating condition is simulated in a kind of deep-foundation pit engineering, including simulation is supplied water
System, simulation system for pit, data collection system.
Simulation water system includes immersible pump, water tank, water supply pipe, and immersible pump is arranged in water tank, water supplying pipe one
The water outlet for the immersible pump held and be arranged in water tank connects, and the other end flows back into water tank.
Simulating system for pit includes that simulation foundation pit pile supporting assembly and simulation pile foundation cheat excavating condition.
Simulating foundation pit pile supporting assembly includes chamber and pile supporting system.Chamber is body structure, the top of chamber
Panel and front plate are detachable movable plate, and chamber side panel is equipped with multiple pipeline tappings, to run through water supplying pipe, and to
Meet pipeline and foundation pit spacing and pipeline buried depth different during testing, the pipeline tapping position on the panel of the left and right sides is corresponding
Setting.Water supplying pipe penetrates in chamber through pipeline tapping, offers simulation breach in the middle part of the water supply pipeline section in chamber, described
Breach is simulated as drilling tool drilling, simulation breach is circular hole or semicircle orifice, having a size of 1mm-1cm.Prepare multiple groups setting
The water delivery pipeline section of different breach sizes, type.The water supplying pipe is divided into the mould in the circulation line and chamber outside chamber
Quasi- water-feeding & drainaging pipeline, circulation line are spring skeleton structure plastic pipe, and simulation water-feeding & drainaging pipeline is PPR pipe in chamber.
Water supplying pipe is equipped with electromagnetic flowmeter, pressure transmitter, control ball valve.It is located at outside chamber on the water supplying pipe
Electromagnetic flowmeter, pressure transmitter is respectively set in water inlet end and water outlet, is located at water pump starting point and water on the water supplying pipe
Stream reflux section is respectively provided with control ball valve.
It is equipped with pile supporting system, including pile body, stake pedestal, dowel crown beam in chamber, distinguishes on the stake pedestal, dowel crown beam
Pile body jack is offered, the quantity of jack and the quantity of pile body are identical, and aperture is identical as the outer diameter of pile body.Pile body and stake pedestal,
Dowel crown beam is connected through jack grafting, and dowel crown beam is fixedly connected with the top of chamber and bottom plate respectively with stake pedestal.Multiple pile bodies
It is vertically arranged, the lower end of pile body is inserted into respectively in the jack of stake pedestal.
The groove of spud pile pedestal, groove size and stake pedestal ruler are set at the nearly front Board position of the bottom plate of chamber bottom
Very little corresponding, stake pedestal is embedded into the groove on chamber bottom plate Nei in order to fixation, chamber top corresponding position spud pile
Crown beam.
A campshed body jack is offered on dowel crown beam, the quantity of pile body jack and the quantity of pile body are identical, aperture and pile body
Outer diameter it is identical, the upper end of pile body is inserted into respectively in the pile body jack in crown beam, and two sides offer deck, dowel crown below dowel crown beam
Beam is fixedly connected with test upper box part with deck.
Simulate pile foundation and cheat excavating condition, the front plate of chamber is detachable movable plate, using at Model Pile outer as foundation pit
Excavating sideline, Model Pile outer are 10cm away from chamber front plate distance, guarantee that front plate firmly installs when banketing.It is whole to guarantee
Body uniformly bankets and uniformly tamps.To avoid unevenness of banketing at model pile body, and the bedding architecture of undisturbed soil can be simulated.Simulation
Front plate is removed when excavating condition, then the excavation pit along model pile body.To guarantee that work-based logic and Practical Project keep one
It causes.
The data collection system includes soil pressure cell, osmometer, and the soil pressure cell is arranged in chamber bottom and case
Wall central location, the osmometer distribution are set in the soil body.
The soil pressure cell uses miniature strain earth pressure gauge, is arranged in chamber bottom and tank wall central location.It is described
Osmometer at piping failure using hemispherical, as the center of circle, to be laid.It lays altogether two layers, radius is respectively 100mm and 200mm.With
Permeation pathway, osmotic pressure and the water conservancy gradient of native internal water during monitoring test at piping failure.The data are adopted
Collecting system acquires biosensor assay data using Static Electro resistive strain acquirement case and uploads to computer.
The data collection system may also include foil gauge, and the foil gauge is attached to simulation water-feeding drainaging line and Model Pile
On.
The sensor includes the monitoring component such as soil pressure cell, osmometer, foil gauge.
Experimental rig based on campshed supporting foundation pit stability study under the simulation deep-foundation pit engineering pipeline breaking operating condition
Test method include the following steps:
1. preparing earth material, sand sieve is sieved, the sand in 1mm or less different-grain diameter section is obtained, further according to testing crew system
Fixed grading distribution scheme allotment；
2. by sensor is connected on the acquisition channel of Static Electro resistive strain acquirement case, to sensor pretreatment (impregnate or
Balance reading)；
3. preparing soil infiltration private bag, it will be dried according to the deployed soil sample of grading distribution scheme, then weigh, take 40 kilograms of soil every time
Sample carries out soil sample water distribution, water holding moisture content when aqueous rate score is using test set soil sample dry density.It packs after mixing evenly
Sealing, standing use afterwards for 24 hours；Fixed model pile body；
4. being sealed unused pipeline tapping is reserved on chamber side panel；
5. laying osmometer；
6. it bankets into chamber, placement sensor harness；
7. chamber stake front plate is removed, soil before stake is excavated；
8. monitoring device Acquisition Instrument is connected to computer, Acquisition Instrument software kit is opened, opens simultaneously the electricity of test electrical equipment
Source and test electrical equipment monitoring of software；
9. opening the control ball valve on water supply line, water pump is connected；
10. adjusting control ball valve aperture starts to test to preset pipeline pressure；
11. revealing flow, seepage flow situation, the data of sensor Real-time Feedback and default examination according to pipeline breaking mouth during test
Test project setting water system pressure and flow；
12. data acquire.
The pattern foundation pit supporting structure that the present invention can rupture under operating condition for water supply and sewerage pipeline provides experiment and simulation, and then analyzes this operating condition
Influence to engineering safety improves the safety coefficient of supporting operation.
Detailed description of the invention
Fig. 1 is the test of campshed supporting foundation pit stability study under simulation deep-foundation pit engineering pipeline breaking operating condition of the invention
Apparatus structure schematic diagram；
Fig. 2 is Model Pile schematic diagram of base structure；
Fig. 3 is dowel crown girder construction schematic diagram；
Fig. 4 is pile supporting system decomposition diagram；
Fig. 5 is water route schematic diagram；
Fig. 6 is osmometer layout diagram；
Fig. 7 is the achievement of preliminary test, and test initial data is obtained after treatment in different water supply line internal pressure stream
Excess pore water pressure under amount, in the soil body at each sensor position；
When Fig. 8 is preliminary test, simulates foundation pit failure mode and destroy position.
Component in figure: 1 be immersible pump, 2 be water tank, 3 be water supplying pipe, 4 be chamber, 5 be top panel, 6 be front plate,
7 it is side panel, 8 be pipeline tapping, 9 be bottom plate, 10 be a pedestal, 11 be pile body, 12 be dowel crown beam, 13 be deck, 14 is stake
Body jack, 15 be electromagnetic flowmeter, 16 be pressure transmitter, 17 be control ball valve.
Specific embodiment
The experimental rig of stake supporting foundation pit stability under pipeline breaking operating condition, including simulation are simulated in a kind of deep-foundation pit engineering
Foundation pit supporting system, simulating excavation operating condition simulate water system, data collection system.
Simulate water system, including immersible pump 1, water tank 2 and water supply pipe 3.Water supplying pipe 3 and it is arranged in water tank
The water outlet of immersible pump 1 connects, and the other end flows back into water tank 2.Water supplying pipe is divided into circulation line and test outside chamber
Simulation water-feeding & drainaging pipeline in case, water supplying pipe use spring skeleton structure plastic pipe and PPR pipe, and circulation line uses spring skeleton
Structure plastic pipe simulates in chamber and uses PPR pipe at water-feeding & drainaging pipeline.PPR pipe centre setting simulation breach, breach
For circular hole or semicircle orifice, breach is having a size of 1mm-1cm, preferably 1mm-6mm.And prepare multiple groups be arranged different breach sizes,
The water delivery PPR pipe section of type.Pressure transmitter 16, electromagnetic flowmeter 15 and multiple groups control ball valve are installed on hydraulic pipeline respectively
17.Chamber side panel is equipped with nine groups of pipeline tappings 8.The square array arrangement of spacing 150mm.Distance model pile body 11 is nearest
The pipeline tapping 8 at place is 200mm at a distance from model pile body 11, with meet different foundation pit and pipeline pitch requirements in test,
The requirement of different buried depth of pipeline.
Simulating foundation pit pile supporting assembly includes chamber 4 and pile supporting system.The top panel 5 and front plate 6 of chamber be
Detachable movable plate.The groove of spud pile pedestal is arranged in chamber bottom, and the deck 13 of fixed crown beam is arranged in top.
It simulates pile foundation and cheats excavating condition, the front plate 6 of chamber is detachable movable plate, to be at 11 outer of model pile body
Excavation of foundation pit sideline, Model Pile outer are 10cm away from chamber front plate distance, are banketed using layered mode, are guaranteed just when banketing
Panel 6 firmly installs.It is uniformly banketed with guarantee entirety and is uniformly tamped.To avoid unevenness of banketing at model pile body, and can be with mould
The bedding architecture of quasi- undisturbed soil.Front plate 6 is removed when excavation simulation operating condition, then the excavation pit along model pile body, and successively
Excavate after pile body and soil before plate.To guarantee that work-based logic is consistent with Practical Project.
Pile supporting system, including multiple pile bodies 11, stake pedestal 10 and dowel crown beam 12.
The stake pedestal 10 is opened thereon to be bonded together after bilayer 17mm thickness acrylic board aperture with dedicated UV shadowless glue
Equipped with pile body jack 14, the quantity of pile body jack 14 and the quantity of pile body are identical, and aperture is identical as the outer diameter of pile body.Multiple pile bodies
11 are vertically arranged, and the lower end of pile body 11 is inserted into respectively in the pile body jack 14 of stake pedestal 10.Stake pedestal 10 is embedded into chamber bottom
In order to fixation in groove on plate 9.
Dowel crown beam 12 is stacked and is bonded together by multilayer poly (methyl methacrylate) plate and constituted, and bottom poly (methyl methacrylate) plate part vehicle is thin
10cm is fixed with forming deck 13 with chamber.A campshed body jack 14, the quantity of pile body jack are offered in crown beam
Identical as the quantity of pile body, aperture is identical as the outer diameter of pile body.Dowel crown beam 12 be located in the upper end of pile body 11 and in chamber
Portion's deck 13 is fixedly connected, and the upper end of pile body is inserted into respectively in the pile body jack on dowel crown beam 21.Pile supporting system is whole
It is placed in test flume, and filling soil arrives setting height in test grain.
Data collection system, including loine pressure flow monitoring acquisition system and seepage tests data collection system.
The loine pressure flow monitoring acquisition system is the pressure transmitter 16 and electromagnetic flowmeter 15 in water system
Data monitoring and acquisition.In order to which testing crew understands the streamflow regime in pipeline at any time during testing, and can be used for trying
Test later data processing.
The seepage tests data collection system includes soil pressure cell and osmometer, and soil pressure cell uses miniature strain soil pressure
Power meter is mainly arranged in chamber bottom and tank wall central location, for monitoring the variation feelings of whole soil pressure in flow event
Condition.
Osmometer be for measure for a long time in hole or stratum infiltration water flow pressure instrument, osmometer by elastic sheet, answer
Become sensing element, capsul and four part of outgoing cable composition.
Osmometer at piping failure using hemispherical, as the center of circle, to be laid.Lay altogether two layers, radius be respectively 100mm and
200mm.With the permeation pathway, osmotic pressure and water conservancy gradient of the native internal water at piping failure during monitoring test.(examination
Initial stage is tested in order to prevent since land movement or cavity lead to sensor shift, sensor fine steel rib rod is connected integral).
Permeable stone should be made to meet the direction to water flow when embedded, with this accurate measurement flowing pressure.
The seepage tests data collection system may also include foil gauge, and resistance strain gage working principle is based on metal
Strain effect (resistance value of wire with its deformation size and there is a phenomenon where corresponding change, R=ρ L/A).Foil gauge is pasted
On simulation water-feeding drainaging line and model pile body, it is made to stretch together with the strain of measured pipeline, in this way the metal of the inside
Foil is just elongated or shortened with strain, and resistance approximately linear can also change therewith.
Foil gauge generally according to stress and monitoring purpose using wheatstone circuit single bridge, half-bridge and full-bridge connection into
The measurement of row strain.In this monitoring, because the force and deformation state of pipeline is fairly simple clear and most concerned about tension and compression stress,
We utilize single bridge connection type of wheatstone circuit, and use single-minded temperature-compensating with compensation temperature etc. each group of measuring point
Influence to data.Due to strain caused by resistance variations it is very small, generally use Wheatstone bridge circuit measure simultaneously
Signal is carried out to amplify to obtain corresponding clear signal.
Embodiment 1
The experimental rig of stake supporting foundation pit stability under pipeline breaking operating condition, including simulation foundation pit are simulated in a kind of deep-foundation pit engineering
Support system, simulating excavation operating condition simulate water system, data collection system.
Simulate water system, including immersible pump 1, water tank 2 and water supply pipe 3.Water supplying pipe 3 and it is arranged in water tank
The water outlet of immersible pump 1 connects, and the other end flows back into water tank 2.Water supplying pipe is divided into circulation line and test outside chamber
Simulation water-feeding & drainaging pipeline in case, water supplying pipe use spring skeleton structure plastic pipe and PPR pipe, and circulation line uses spring skeleton
Structure plastic pipe simulates in chamber and uses PPR pipe at water-feeding & drainaging pipeline.PPR pipe centre bores 1 circular hole with boring bar tool,
Pore diameter range is 1mm-10mm, and maiden trial uses 6mm circular hole.All pipelines uniformly use 40mm caliber, on water supply pipe,
Left end water flow, which enters, outside chamber is arranged one group of pressure transmitter 16 and electromagnetic flowmeter 15, chamber external right at chamber
It holds and one group of pressure transmitter 16 and electromagnetic flowmeter 15 is set at water flow outflow chamber.It is located at water pump starting point on water supplying pipe 3
With water flow reflux end setting control ball valve 17.
1 model QDX8-18-0.75 of immersible pump.Specification are as follows: pump pressure 2.0bar, flow be 7 cubes per hour, out
Mouth of a river caliber 40mm.16 model HX-L61 of pressure transmitter.Range is 0-0.1Mpa.15 model YY- of electromagnetic flowmeter
LED.Pressure limit is 0-4Mpa, flow velocity 0.1-1.5m/s.
Chamber side panel be equipped with nine groups of pipeline tappings 8, the square array arrangement of spacing 150mm, aperture 40.5mm, away from
It is 200mm at a distance from model pile body 11 from the pipeline tapping 8 of model pile body 11 most nearby, to meet foundation pit different in test
From the requirement of pipeline pitch requirements, different buried depth of pipeline.
Simulating foundation pit pile supporting assembly includes chamber 4 and pile supporting system.In order to guarantee transparent and intensity, chamber is adopted
It is assembled with 17mm thickness acrylic board, having a size of 600*600*800mm, screw bolt reinforcing, bottom plate and side are used between chamber plate
Plate junction is reinforced using 3mm thickness angle steel and 6mm shank of bolt, and the top panel 5 and front plate 6 of chamber are detachable movable plate.
The groove of spud pile pedestal is arranged in chamber bottom, and the deck 13 of fixed crown beam is arranged in top.Stake pedestal 10 is bilayer 17mm thick
It is bonded together after acrylic board aperture with dedicated UV shadowless glue.Dowel crown beam 12 is stacked by multilayer poly (methyl methacrylate) plate and is bonded in one
It rises and constitutes, the bottom poly (methyl methacrylate) plate part thin 10cm of vehicle is fixed with forming deck with chamber.
It simulates pile foundation and cheats excavating condition, the front plate 6 of chamber is detachable movable plate, to be at 11 outer of model pile body
Excavation of foundation pit sideline, Model Pile outer are 10cm away from chamber front plate distance, are banketed using layered mode, every layer of control exists
5cm is thick and tamps.Guarantee that front plate 6 firmly installs when banketing.It is uniformly banketed with guarantee entirety and is uniformly tamped.To avoid model
It bankets at pile body unevenness, and the bedding architecture of undisturbed soil can be simulated.Front plate 6 is removed when excavation simulation operating condition, then along mould
Excavation pit at type pile body, and successively excavate after pile body and soil before plate.To guarantee that work-based logic is consistent with Practical Project.
Pile supporting system, including 11 pile bodies 11, stake pedestal 10 and dowel crown beam 12.
The stake pedestal 10 is opened thereon to be bonded together after bilayer 17mm thickness acrylic board aperture with dedicated UV shadowless glue
Equipped with pile body jack 14, the quantity of pile body jack 14 and the quantity of pile body are identical, and aperture is identical as the outer diameter of pile body.11 stakes
Body 11 is vertically arranged, and the lower end of pile body 11 is inserted into respectively in the pile body jack 14 of stake pedestal 10.Stake pedestal 10 is embedded into chamber
It is right against the groove at crown beam Nei on bottom plate 9 in order to fixation.Pile body jack on dowel crown beam, stake pedestal is through-hole.
Dowel crown beam 12 is stacked and is bonded together by two layers of poly (methyl methacrylate) plate and constituted, and bottom poly (methyl methacrylate) plate part vehicle is thin
10cm is fixed with forming deck 13 with chamber.A campshed body jack 14, the quantity of pile body jack are offered in crown beam
Identical as the quantity of pile body, aperture is identical as the outer diameter of pile body.Dowel crown beam 12 be located in the upper end of pile body 11 and in chamber
Portion's deck 13 is fixedly connected, and the upper end of pile body is inserted into respectively in the pile body jack on dowel crown beam 21.
Pile supporting system is using cylindrical organic glass, and stake diameter 20mm, stake spacing 30mm, pile center is away from 50mm.
Pile supporting system is integrally placed in test flume, and filling soil arrives crown beam bottom in test grain.
Data collection system, including loine pressure flow monitoring acquisition system and seepage tests data collection system.
The loine pressure flow monitoring acquisition system is pressure transmitter 5 and electromagnetic flowmeter 6 in water system
Data monitoring and acquisition.The seepage tests data collection system, including foil gauge, soil pressure cell and osmometer.
Soil pressure cell uses miniature strain earth pressure gauge, model BWT-5.Sum is 5, is respectively arranged in chamber case
Bottom central location and chamber tank wall central location.For monitoring the situation of change of whole soil pressure in flow event.
Osmometer model DMKY.Be for measure for a long time in hole or stratum infiltration water flow pressure instrument, osmometer by
Elastic sheet, strain sensor, capsul and four part of outgoing cable composition.
Foil gauge model BF1K-3AA.Foil gauge is attached to the middle position of simulation water-feeding drainaging line, and most central
The middle position of a piece model pile body.
Osmometer, as the center of circle, to be laid, be laid altogether two layers using hemispherical at piping failure, radius be respectively 100mm and
200mm.With the permeation pathway, osmotic pressure and water conservancy gradient of the native internal water at piping failure during monitoring test.(examination
Initial stage is tested in order to prevent since land movement or cavity lead to sensor shift, sensor fine steel rib rod is connected integral).
Permeable stone should be made to meet the direction to water flow when embedded, with this accurate measurement flowing pressure.
This test is using highly sensitive osmometer, the microsensor volume very little, long 16 mm, diameter 28
mm.With precision height, high frequency dynamic response, temperature range is wide, good advantage steady in a long-term.Range is 0 ~ 0.1MPa, resolution ratio %
FS≤0.05, Ω >=200 impedance 350 Ω, insulation resistance M.
The data collection system acquires biosensor assay data using Static Electro resistive strain acquirement case and uploads to meter
Calculation machine.
The sensor includes the monitoring component such as soil pressure cell, osmometer, foil gauge.
Test method:
1. preparing earth material, sand sieve is sieved, the sand in 1mm or less different-grain diameter section is obtained, further according to testing crew system
Fixed grading distribution scheme allotment.
2. sensor is connected on the acquisition channel of Static Electro resistive strain acquirement case, sensor pretreatment (is impregnated
Or balance reading)；
3. preparing soil infiltration private bag, it will be dried according to the deployed soil sample of grading distribution scheme, then weigh, take 40 kilograms of soil every time
Sample carries out soil sample water distribution, water holding moisture content when aqueous rate score is using test set soil sample dry density.It packs after mixing evenly
Sealing, standing use afterwards for 24 hours；
4. setting Model Pile pedestal in chamber lining, Model Pile is done into simple amendment, is inserted into fixed in stake pedestal.And cover hat
Beam, and crown beam is stuck in the card slot of chamber top preset.
5. unused pipeline tapping at the poly (methyl methacrylate) plate of chamber side wall is sealed with adhesive tape and rubber stopper, prevent
Moisture leakage in soil sample and soil during banketing.
6. osmometer is fixed on sensor stand by presupposed solution with hot melt adhesive or AB glue.Put harness in order.
7. banketing and tamping into experimental tank, the scheme that check experiment personnel design during banketing is set sensor is monitored
It is standby to be deployed to corresponding position in the soil body.
8. stopping banketing when banketing to case top surface.
9. chamber stake front panel is removed, soil before stake is excavated.
10. Acquisition Instrument is connected to computer.Open Acquisition Instrument software kit.Open simultaneously test electrical equipment power supply and
Test electrical equipment monitoring of software.
11. laying digital camera for monitoring Seepage of Foundation Pit process after line fracture.
12. opening the control ball valve on water supply line, water pump is connected.Observation test electrical equipment and sensor acquire equipment
Data.Confirm that rear controlling opening of valve without exception to preset pipeline pressure, starts to test.
13. revealing flow, seepage flow situation, data of sensor Real-time Feedback and pre- according to pipeline breaking mouth during test
If testing program adjusts water system pressure and flow.
14. pipeline pressure data flows of traffic can determine that the timing node of experiment beginning and end, sensing data can be with
Find out timing node when seepage field is stablized after adjusting pipeline hydraulic pressure power every time.According to these timing nodes, it can find out and remember
Record destroys all sensors data stable to collapse state since the soil body.
Test principle:
The pattern foundation pit supporting structure that the present invention can rupture under operating condition for water supply and sewerage pipeline provides experiment and simulation, and it is strong to can analyze different seepage flow
Under degree, aging condition, the characteristics of seepage field of the excavation slope soil body.Also it can analyze under identical seepage flow strength condition, different time
Section, the seepage field of different type (infiltration coefficient) excavation slope soil body, stress field, displacement field feature study soil strength to infiltration
The influence in flow field.And then influence of this operating condition to engineering safety is analyzed, improve the safety coefficient of supporting operation.
Preliminary Experiment achievement
Experimental data pretreatment
1. checking data flow, whether observation data have exception.
2. finding out the timing node of experiment beginning and end according to pipeline pressure data flows of traffic.
3. finding out timing node when seepage field is stablized after adjusting pipeline hydraulic pressure power every time according to data flow, and record at this time
The data of each sensor.
4. finding out timing node when simulation soil mass of foundation pit destroys cracking according to data flow, the record soil body starts to destroy to broken
Bad in stable condition all sensors data.
Experimental data calculates
1. generally measuring using Wheatstone bridge circuit since resistance variations caused by straining are very small and carrying out signal
Amplification obtains corresponding clear signal.
2. sensor operating principles are that the strain effect based on metal (send out with the size of its deformation by the resistance value of wire
The phenomenon that raw corresponding change,).Sensor internal foil gauge is flexible with fluid to be measured pressure change, in this way inside
Metal foil is just elongated or shortened with strain, and resistance approximately linear can also change therewith.
3. having carried out range designation, the measurement pressure of sensor and the dependent variable substantially linear of sensor before sensor factory
It is related.
4. calculation formula are as follows: sensor measuring value (Kpa)=transducer calibration range × measurement microstrain amount ÷ sensing
Device microstrain total amount
Interpretation screening
1. duration of experiment is usually 1-2 hours since Acquisition Instrument data acquisition intervals are 2s.Experiential data stream is very more.
So data are done with arrangement screening operation.
2. checking in data flow whether there are unusual fluctuations, sensor fault is judged whether it is.
3. finding out the timing node for adjusting pipeline pressure in experimentation every time according to pipeline pressure data flows of traffic.
4. filtering out experimental data when sensing data after adjustment pipeline hydraulic pressure power every time is stablized after node time.
5. the data preparation screened is made into data drawing list and fits curve.
In preliminary test, we achieve preferable achievement using the set device and method.Fig. 8 is simulation foundation pit
Stability reach capacity after state, since the osmotic pressure in the soil body continues to increase, fine grained is lost in the soil body.It eventually leads to
Foundation pit side-wall seriously destroys.Simulation foundation pit failure mode in Fig. 8 is collapsed with foundation pit side-wall caused by the seepage flow in Practical Project
Form is almost consistent.We can calculate depanning by the pressure gauge and electromagnetic flowmeter of pipeline upper and lower ends during test
Injection pressure and leakage flow at quasi- water-feeding drainaging line breach.It can monitor to test by the sensor inside chamber
The significant datas such as the variation of inside soil body soil pressure and the distribution of inside soil body seepage field in the process.Fig. 7 is partial data by whole
The chart made after reason fitting.
Claims (10)
1. the experimental rig of campshed supporting foundation pit stability study, feature under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition
It is, described device includes simulation water system, simulation system for pit, data collection system, and the simulation water system includes
Immersible pump (1), water tank (2), water supplying pipe (3), immersible pump (1) setting is in water tank (2), water supplying pipe (3) one end and diving
The water outlet connection of (1) is pumped, the other end flows back into water tank (2)；
The simulation system for pit includes chamber (4) and pile supporting system, the top panel (5) and front plate (6) of chamber (4)
Side panel (7) for detachable movable plate, chamber (4) is equipped with pipeline tapping (8), and stake prop is equipped in chamber (4)
System, including stake pedestal (10), pile body (11), dowel crown beam (12), the stake pedestal (10), dowel crown beam offer stake on (12) respectively
Body jack (14), pile body (11) are connected with stake pedestal (10), dowel crown beam (12) through pile body jack (14) grafting, dowel crown beam (12) with
Stake pedestal (10) is fixedly connected with the top of chamber (4) and bottom plate (9) respectively；
The water supplying pipe (3) penetrates in chamber (4) through pipeline tapping (8), offers in the middle part of the water supply pipeline section in chamber (4)
Breach is simulated, water supplying pipe (3) is equipped with electromagnetic flowmeter (15), pressure transmitter (16), control ball valve (17)；
The data collection system includes soil pressure cell, osmometer, and the soil pressure cell is arranged in chamber bottom and tank wall
Position is entreated, the osmometer distribution is set in the soil body.
2. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that spud pile pedestal is set at the Board position of front on the bottom plate of the chamber (4)
Groove, groove size are corresponding with stake base dimensions；Corresponding position spud pile crown beam (12) at the top of chamber, under dowel crown beam (12)
Square two sides offer deck (13), and dowel crown beam (12) is fixedly connected at the top of chamber (4) through deck.
3. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that the simulation breach is drilling tool drilling, and simulation breach is circular hole or semicircle
Hole, having a size of 1mm-1cm.
4. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that be located on the water inlet end outside chamber and water outlet on the water supplying pipe (3) and be respectively set
Electromagnetic flowmeter (15), pressure transmitter (16) are located at water pump starting point and the setting control of water flow reflux end on the water supplying pipe (3)
Ball valve (17) processed.
5. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that the soil pressure cell uses miniature strain earth pressure gauge, is arranged in chamber bottom and case
Wall central location；, as the center of circle, to be laid, be laid altogether two layers using hemispherical at piping failure, radius is respectively the osmometer
100mm and 200mm, with permeation pathway, osmotic pressure and the water conservancy of the native internal water at piping failure during monitoring test
Gradient.
6. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that the data collection system may also include foil gauge, and the foil gauge is attached to simulation discharge
On water pipeline and Model Pile, the data collection system acquires biosensor assay data simultaneously using Static Electro resistive strain acquirement case
Upload to computer.
7. campshed supporting foundation pit stability is ground under a kind of simulation deep-foundation pit engineering pipeline breaking operating condition according to claim 1
The experimental rig studied carefully, which is characterized in that the water supplying pipe (3) be divided into the simulation in the circulation line and chamber outside chamber to
Discharge pipe line, circulation line are spring skeleton structure plastic pipe, and simulation water-feeding & drainaging pipeline is PPR pipe in chamber.
8. campshed supporting foundation pit is steady under a kind of -7 any simulation deep-foundation pit engineering pipeline breaking operating conditions according to claim 1
The experimental rig of qualitative research, which is characterized in that described device is suitable for sand pit, and clay content is less than 5%.
9. campshed supporting foundation pit is steady under the simulation deep-foundation pit engineering pipeline breaking operating condition of experimental rig according to claim 1
The test method of qualitative research, which is characterized in that described method includes following steps:
1) prepare earth material, sand sieve is sieved, the sand in 1mm or less different-grain diameter section is obtained, further according to testing crew system
Fixed grading distribution scheme allotment；
2) sensor is connected on the acquisition channel of Static Electro resistive strain acquirement case, sensor pretreatment (is impregnated or flat
Weighing apparatus reading)；
3) prepare soil infiltration private bag, will be dried according to the deployed soil sample of grading distribution scheme, then weigh, take 40 kilograms of soil every time
Sample carries out soil sample water distribution, water holding moisture content when aqueous rate score is using test set soil sample dry density；It packs after mixing evenly
Sealing, standing use afterwards for 24 hours；Fixed model pile body；
4) unused pipeline tapping will be reserved on chamber side panel to seal；
5) osmometer is laid；
6) it bankets into chamber, placement sensor harness；
7) chamber stake front plate is removed, soil before stake is excavated；
8) monitoring device Acquisition Instrument is connected to computer, opens Acquisition Instrument software kit, open simultaneously the electricity of test electrical equipment
Source and test electrical equipment monitoring of software；
9) the control ball valve on water supply line is opened, water pump is connected；
10) adjusting control ball valve aperture starts to test to preset pipeline pressure；
11) flow, seepage flow situation, the data of sensor Real-time Feedback and default examination are revealed according to pipeline breaking mouth during testing
Test project setting water system pressure and flow；
12) data acquire.
10. campshed supporting foundation pit under the simulation deep-foundation pit engineering pipeline breaking operating condition of experimental rig according to claim 9
The test method of stability study, which is characterized in that the step 6 is specially with Model Pile in vitro at for excavation of foundation pit side
Line, bankets using layered mode, guarantees that front plate firmly installs when banketing, and the stratification knot of undisturbed soil is simulated in uniform compacting of banketing
Structure；The step 7 removes front plate when being specially excavation simulation operating condition, then the excavation pit along model pile body, and successively digs
Except after pile body and plate before soil, to guarantee that work-based logic is consistent with Practical Project.
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| CN114441406A (en) * | 2022-01-05 | 2022-05-06 | 中交第四航务工程局有限公司 | Test system and test method for simulating local seepage of waterproof curtain of foundation pit |
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