CN109799327A - A kind of visual shield tunnel construction detection of grouting effects experimental rig and method - Google Patents
A kind of visual shield tunnel construction detection of grouting effects experimental rig and method Download PDFInfo
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- CN109799327A CN109799327A CN201910175509.2A CN201910175509A CN109799327A CN 109799327 A CN109799327 A CN 109799327A CN 201910175509 A CN201910175509 A CN 201910175509A CN 109799327 A CN109799327 A CN 109799327A
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Abstract
The invention discloses a kind of visual shield tunnel construction detection of grouting effects experimental rig and method, organic glass cabinet is provided with the transparent soil for simulated formation；Cutter head of shield machine is set to shield machine case nose, and is driven by drive system；Hydraulic jack front end connects drive system, simulates the pushing tow process of shield, and rear end acts on shield duct piece, simulates the squeezing action to shield duct piece；Shield duct piece carries out circumferential and longitudinal staggered joint erection by assembling system, simulates the connection and interaction between section of jurisdiction；Grouting behind shaft or drift lining is carried out by synchronous grouting system, secondary grouting is carried out by the secondary grouting hole reserved on shield duct piece by secondary grouting system.The present invention provides a visual external environment for test, can directly observe the states such as slurries seepage flow, condensation；The processes such as pushing tow, pipe sheet assembling, secondary grouting in construction are considered, can analyze influence of each working procedure to slip casting.
Description
Technical field
The present invention relates to structure constructing tunnel detection technique field, specially a kind of visual shield tunnel construction slip casting effect
Fruit detects experimental rig and method.
Background technique
As urbanization process is getting faster, quick development is had been obtained in underground space construction, and shield tunnel is applied
Work provides guarantee for underground space construction.In Analysis on Shield Tunnel Driven Process, Shield-type machinery is cut in underground propulsion, propulsion by cutterhead
The soil body is cut, rear jack acts on segment assembly the pushing tow that pressurizes and advances, and shield machine shell and section of jurisdiction support surrounding country rock
Pressure.Slurries, which are injected, since there are gaps between shield machine shell and segment assembly, when needing to tunnel fills gap.Slip casting effect
Section of jurisdiction stable case is directly affected, in the period of exactly it needs most care during constructing tunnel, while simultaneous grouting slurry
There is certain presetting period, and reaches first coalescence at it and formed in the time range of some strength, shield driving is still carrying out, by
It is paid close attention in construction influence and needs caused by it.Therefore it needs to be studied for slip casting effect in work progress, this
There is very important meaning for tunnel stabilization and later period operation security.Study slip casting effect when, need to carry out theoretical research,
Numerical simulation and a large amount of indoor model tests.And due to the particularity of grouting behind shaft or drift lining, slurries can not be intuitively observed at the construction field (site)
Flowing after wall consolidates situation, it is difficult to correlation test be unfolded, it is therefore necessary to carry out experimental study indoors, could be shield tunnel
Road, which excavates, provides theoretical direction.
Currently, the research for shield tunnel slip casting effect, mainly by theoretical research, numerical simulation and laboratory test:
1) patentee is Hohai University, and Chinese Patent Application No. 201610223266.1 and 201620299444.4 describes
A kind of experimental rig that simulation slurry shield slurry permeates in the earth formation.The device includes glass box body, overflow launder, model knife
Disk, ring flange, mud valve etc. can be packed into the simulated formation of transparent soil preparation in glass box body, inject in glass cylinder
Mud is tested, permeability test is carried out, the infiltration form of mud in the earth formation can be observed, while different cutterhead openings can be simulated
Situation is permeated under rate.But there is slurries certain presetting period to be not only simple free seepage after the implantation, condense
Many-sided influences such as driving, section of jurisdiction extruding are also suffered from before reaching intensity, these can all influence its and permeate form, and this method does not have
There is consideration shield duct piece on a series of influences such as slurries extruding, therefore this method has certain limitation.
2) patentee is China Mining University Beijing, and Chinese Patent Application No. 201510731363.7 describes one kind
Shield tunneling gap is studied to the method for numerical simulation of settlement influence.The method for numerical simulation adds on the shell of shield model
One layer of filled layer, slurries are injected into filled layer, are passed through and are changed the mechanics parameter of filling layer material and simulate different packing materials
Influence to sedimentation.But since practice of construction is a complicated process, slurries can have infiltration, crossfire etc. one in the process
Series variation, will all have an impact result, therefore there may be certain deviations for this method.
3) patentee is middle two the 4th Engineering Co., Ltd, public office of friendship, and Chinese Patent Application No. is
201710419037.1 describing a kind of drilling type experimental rig for shield model test.The device includes workbench, drives
Dynamic system, cutterhead and grouting system etc., which can accomplish that will excavate drilling combines with grouting at the tail of the shield machine, by hydraulic
Pump control intraluminal fluid pressure size simulates grouting at the tail of the shield machine, reduces the process of live shield tunneling and slip casting well, and can be into
The test of row multi-state, is a kind of preferable shield tunneling grouting model test device of adaptability.But do not consider in shield-tunneling construction
Pipe sheet assembling and pushing tow process simulation, it is practical assembled during jack act on section of jurisdiction, section of jurisdiction can generate slurries
It squeezes, influences slip casting effect；There are the processes such as secondary grouting in practice of construction, and the device does not consider secondary grouting in construction
Simulation；In the apparatus, tunnel duct piece is homogeneous annulus, and the form of section of jurisdiction staggered joint erection is not studied；To sum up, the dress
It is equipped with certain limitation.
At present indoors test during, for the research in terms of shield grouting effect be mostly individually to slurries in the earth formation
The research for permeating form, does not account for the influence of work progress；Even if some consider the process of shield tunneling and slip casting, but
It is the simulation for having ignored pipe sheet assembling process and secondary grouting process, during assembled, jack is acted on section of jurisdiction, section of jurisdiction
Pressure by jack acts on, and then generates squeezing action to surrounding slurries, and assembled process can be to detection of grouting effects
Influence is very big, likewise, the processes such as secondary grouting are also the factor of impact effect, therefore ignore these processes and causes final effect
Inaccuracy；Likewise, existing in existing model test visual since shield is the engineering behavior occurred in the earth formation
Change aspect Shortcomings；It is the research of a relative ideal by the research that numerical simulation is made, in work progress one
A little complicated variations can not be simulated all, therefore also have certain limitation.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of consideration drivings, synchronous grouting, pipe sheet assembling and two
The simulation of the processes such as secondary slip casting, can seepage configuration to slurries, section of jurisdiction slurries squeezing action is accordingly monitored, and is passed through
Slip casting effect is assessed in the monitoring of ground relative storey displacement, can provide more effective support for the evaluation of shield tunnel slip casting effect
Visual shield tunnel construction detection of grouting effects experimental rig and method.Technical solution is as follows:
A kind of visual shield tunnel construction detection of grouting effects experimental rig, including organic glass box body and shield machine simulation
System；Organic glass cabinet is provided with the transparent soil for simulated formation, and shield machine simulation system includes cutter head of shield machine, shield
Machine shell, hydraulic jack and shield duct piece；Cutter head of shield machine is set to shield machine case nose, and by drive system driving from
The reserved hole driving in organic glass cabinet side；Hydraulic jack front end connects drive system, simulates the pushing tow process of shield,
Rear end acts on shield duct piece, simulates the squeezing action to shield duct piece；The shield duct piece is carried out circumferential by assembling system
With longitudinal staggered joint erection, connection and interaction between section of jurisdiction are simulated；It further include synchronous grouting system and secondary grouting system,
Grouting behind shaft or drift lining is carried out by synchronous grouting system, is carried out by secondary grouting system by the secondary grouting hole reserved on shield duct piece
Secondary grouting.
Further, the shield duct piece inner wall is circumferentially disposed with multiple Segment displacement sensors, the corresponding cloth of inner wall
Be equipped with multiple foil gauges and pressure cell, between relative displacement section of jurisdiction and section of jurisdiction and slurries, the active force of interlayer carry out
Measurement.
It further, further include the water tank filled the water by water injection pipe into transparent soil, by being arranged on water injection pipe
Valve regulated simulates different hydraulic pressure.
It further, further include formation displacement sensor, formation displacement sensor gos deep into transparent soil by transmission lever
Soil layer is measured for the displacement to Different Strata depth.
Further, it is attached by circumferential bolt with longitudinal bolt between each section of jurisdiction of the shield duct piece.
A kind of visual shield tunnel construction detection of grouting effects test method, comprising the following steps:
Step 1: model assembling: configuring transparent soil according to similar proportion, and be packed into organic glass box body according to strata condition layering
It is interior, simulated formation；Water tank and water injection pipe are spliced, water filling device valve is opened, adjusts simulated water pressure situation；
Surface sensor is installed, and transmission lever is inserted into the soil body, stands a period of time；
Step 2: device is into hole: open body side reserving hole originates heading equipment into hole, by section of jurisdiction by reaction frame
Staggered joint erection, the gap slip casting between section of jurisdiction and soil layer are carried out, and slurries is waited to have some strength, it is made to have driving item
Part；
Step 3: installation measuring instrument: after having normal driving condition, pasting foil gauge in shield duct piece outer wall, arrange pressure
Box；
Step 4: construction simulation: starting mole is excavated, and is carried out grouting behind shaft or drift lining by synchronous grouting system, is utilized assembly
System segment assembly opens secondary grouting hole and carries out secondary grouting according to actual condition；
Step 5: acquisition data: after the completion of shield segment assembling, in shield duct piece inner wall position installing pipe corresponding with foil gauge
Piece displacement sensor acquires Segment displacement delta data in construction；By pressure data after pressure cell acquisition wall, pass through stratum position
Displacement sensor acquires different depth formation displacement data.
The beneficial effects of the present invention are:
1) the present invention provides a kind of visual shield grouting test models, provide a visual external ring for test
Border can directly observe the states such as slurries seepage flow, condensation；
2) present invention considers the processes such as pushing tow, pipe sheet assembling, secondary grouting in construction, and has carried out corresponding simulation to it,
It can analyze influence of each working procedure to slip casting；
3) present invention considers the connection between section of jurisdiction, is attached by longitudinal bolt, circumferential bolt, and practical according to construction
Carry out staggered joint erection；
4) present invention completes stress after relative storey displacement over the ground, Segment displacement, wall by installation displacement sensor, pressure cell etc.
Etc. data measurement acquisition, provide a kind of scientific, effective, intuitive method for the evaluation of shield tunnel slip casting effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the visual shield tunnel construction detection of grouting effects experimental rig of the present invention.
Fig. 2 is the tunnel segment structure figure of the visual shield tunnel construction detection of grouting effects experimental rig of the present invention.
Fig. 3 is the flow chart of the visual shield tunnel construction detection of grouting effects test method of the present invention.
In figure: 1- organic glass cabinet；The transparent soil of 2-；3- cutter head of shield machine；4- force transmission shaft；5- shield machine shell；6- drives
Dynamic system；7- hydraulic jack；8- synchronous grouting system；9- shield duct piece；10- slurry layer；11- secondary grouting hole；12- bis- times
Grouting system；13- secondary grouting pipe；Bis- slurries of 14-；15- water tank；16- valve；17- water injection pipe；18- formation displacement sensing
Device；19- transmission lever；20- assembling system；21- data acquisition device；22- pressure cell；23- Segment displacement sensor；The longitudinal direction 24- spiral shell
Bolt；25- circumferential direction bolt.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.As shown in Figure 1, a kind of visualization
Shield tunnel construction detection of grouting effects experimental rig, including organic glass box body 1 and shield machine simulation system；Organic glass
Cabinet 1 is provided with transparent native 2 for simulated formation, and shield machine simulation system includes cutter head of shield machine 3, shield machine shell 5, liquid
Press jack 7 and shield duct piece 9；Cutter head of shield machine 3 is set to 5 front end of shield machine shell, and is driven by drive system 6 from organic
The reserved hole driving in 1 side of glass box body；7 front end of hydraulic jack connects drive system 6, simulates the pushing tow process of shield,
Rear end acts on shield duct piece 9, simulates the squeezing action to shield duct piece 9；The shield duct piece 9 is carried out by assembling system 20
Circumferential and longitudinal staggered joint erection, simulates the connection and interaction between section of jurisdiction；It further include synchronous grouting system 8 and secondary grouting
System 12, by synchronous grouting system 8 carry out grouting behind shaft or drift lining, by secondary grouting system 12 by shield duct piece 9 reserve two
Secondary injected hole 11 carries out secondary grouting.
Model cabinet is organic glass cabinet, and box house is the transparent soil configured according to the likelihood ratio, to simulate
Stratum, can make overall model have the characteristics that visualization, and the situations of change such as the flowing of Observable slurries, condensation and inside soil body become
Change.Slip casting effect suitable for studying under different geology and hydrologic regime is studied.It is applicable not only to indoor simulation metro shield tunnel
The test of road slip casting is equally applicable to the tunnel groutings laboratory tests such as municipal piping lane engineering.
Shield machine shell and the radius of section of jurisdiction make according to the likelihood ratio, and radius has different, can simulate in tunneling process
After shield machine shell is detached from, existing gap between section of jurisdiction and the soil body.
As shown in Fig. 2, 9 inner wall of shield duct piece is circumferentially disposed with multiple Segment displacement sensors 23, inner wall is corresponding
Be disposed with multiple foil gauges and pressure cell 22, between relative displacement section of jurisdiction and section of jurisdiction and slurries, interlayer effect
Power measures.Consider the interaction between section of jurisdiction, shield duct piece 9 carries out circumferential and longitudinal staggered joint erection being capable of real simulation pipe
Connection between piece is attached between each section of jurisdiction of shield duct piece 9 with longitudinal bolt 24 by circumferential bolt 25.
Further include the water tank 15 filled the water by water injection pipe 17 into transparent soil, passes through the valve 16 being arranged on water injection pipe 17
It adjusts and simulates different hydraulic pressure.It further include formation displacement sensor 18, formation displacement sensor 18 is goed deep into transparent by transmission lever 19
The soil layer of soil 2, measures for the displacement to Different Strata depth, can disturb to work progress, slurries injection is to the soil body
Improvement etc. carries out numerical value measurement, and then evaluates slip casting effect.
As shown in figure 3, the test process of the present embodiment are as follows:
1) model assembles the stage.First carry out the assembly of organic glass cabinet, body side reserving hole, then according to construction site
Strata condition configures transparent soil according to similar proportion, to simulated formation；Transparent soil is organic according to strata condition layering loading
Glass box body；Water tank and water injection pipe are spliced, water filling device valve is opened, adjusts simulated water pressure situation；Surface sensor is pacified
Dress, transmission lever etc. are inserted into the soil body, stand a period of time, complete the assembling of model.
2) device is into the hole stage.Open body side reserving hole, by equipment such as reaction frames, make heading equipment originate into
Section of jurisdiction is carried out staggered joint erection by hole as illustrated, the gap slip casting between section of jurisdiction and soil layer, and it is certain strong to wait slurries to have
Degree, makes it have driving condition.
3) measuring instrument erection stage.After having normal driving condition, section of jurisdiction is centainly handled, according to upper figure
Foil gauge is pasted in section of jurisdiction corresponding position, arranges pressure cell.
4) the construction simulation stage.Starting mole is excavated, and is carried out grouting behind shaft or drift lining by synchronous grouting system, is utilized
Assembling system segment assembly opens secondary grouting hole and carries out secondary grouting according to actual condition.
5) data acquisition phase.After the completion of pipe sheet assembling, displacement sensor probe is installed in corresponding position, is acquired in construction
Segment displacement delta data, pressure data after the pressure cell acquisition wall arranged behind section of jurisdiction, passes through the sensor acquisition that earth's surface is arranged
Different depth formation displacement data.Realize the acquisition of monitoring data in work progress.
6) the comprehensive analysis stage.By visualization device, slurries seepage flow situation can be directly observed；By Segment displacement,
Layer displacement, analyzes the filling effect of slip casting；By stress behind section of jurisdiction, influence of the dynamic construction process to wall rear slurry is analyzed；It is comprehensive
Analysis acquisition data are closed, seepage flow situation, filling effect and its situation of change are analyzed, may be implemented to work progress slip casting effect
Detection and analysis.
Claims (6)
1. a kind of visual shield tunnel construction detection of grouting effects experimental rig, which is characterized in that including organic glass box
Body (1) and shield machine simulation system；Organic glass cabinet (1) is provided with transparent native (2) for simulated formation, shield machine simulation
System includes cutter head of shield machine (3), shield machine shell (5, hydraulic jack (7) and shield duct piece (9)；Cutter head of shield machine (3) is set
It is placed in shield machine shell (5) front end, and is tunneled by the hole that drive system (6) driving is reserved from organic glass cabinet (1) side；
Hydraulic jack (7) front end connects drive system (6), simulates the pushing tow process of shield, rear end acts on shield duct piece (9), mould
The quasi- squeezing action to shield duct piece (9)；The shield duct piece (9) carries out circumferential and longitudinal fissure of displacement by assembling system (20) and spells
Dress simulates connection and interaction between section of jurisdiction；Further include synchronous grouting system (8) and secondary grouting system (12), passes through
Synchronous grouting system (8) carries out grouting behind shaft or drift lining, by secondary grouting system (12) by secondary grouting reserved on shield duct piece (9)
Hole (11) carries out secondary grouting.
2. visual shield tunnel construction detection of grouting effects experimental rig according to claim 1, which is characterized in that
Shield duct piece (9) inner wall is circumferentially disposed with multiple Segment displacement sensors (23), and inner wall is corresponding to be disposed with multiple answer
Become piece and pressure cell (22), between relative displacement section of jurisdiction and section of jurisdiction and slurries, the active force of interlayer measure.
3. visual shield tunnel construction detection of grouting effects experimental rig according to claim 1, which is characterized in that
Further include the water tank (15) filled the water by water injection pipe (17) into transparent soil, passes through the valve (16) being arranged on water injection pipe (17)
It adjusts and simulates different hydraulic pressure.
4. visual shield tunnel construction detection of grouting effects experimental rig according to claim 1, which is characterized in that
It further include formation displacement sensor (18), formation displacement sensor (18) gos deep into the soil layer of transparent native (2) by transmission lever (19),
It is measured for the displacement to Different Strata depth.
5. visual shield tunnel construction detection of grouting effects experimental rig according to claim 1, which is characterized in that
It is attached by circumferential bolt (25) with longitudinal bolt (24) between each section of jurisdiction of the shield duct piece (9).
6. a kind of visual shield tunnel construction detection of grouting effects test method, which comprises the following steps:
Step 1: model assembling: configuring transparent soil according to similar proportion, and be packed into organic glass box body according to strata condition layering
It is interior, simulated formation；Water tank and water injection pipe are spliced, water filling device valve is opened, adjusts simulated water pressure situation；
Surface sensor is installed, and transmission lever is inserted into the soil body, stands a period of time；
Step 2: device is into hole: open body side reserving hole originates heading equipment into hole, by section of jurisdiction by reaction frame
Staggered joint erection, the gap slip casting between section of jurisdiction and soil layer are carried out, and slurries is waited to have some strength, it is made to have driving item
Part；
Step 3: installation measuring instrument: after having normal driving condition, pasting foil gauge in shield duct piece outer wall, arrange pressure
Box；
Step 4: construction simulation: starting mole is excavated, and is carried out grouting behind shaft or drift lining by synchronous grouting system, is utilized assembly
System segment assembly opens secondary grouting hole and carries out secondary grouting according to actual condition；
Step 5: acquisition data: after the completion of shield segment assembling, in shield duct piece inner wall position installing pipe corresponding with foil gauge
Piece displacement sensor acquires Segment displacement delta data in construction；By pressure data after pressure cell acquisition wall, pass through stratum position
Displacement sensor acquires different depth formation displacement data.
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