CN106198921A - A kind of subway shield tunnel construction Disturbance Model assay device and test method thereof - Google Patents
A kind of subway shield tunnel construction Disturbance Model assay device and test method thereof Download PDFInfo
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- CN106198921A CN106198921A CN201610428530.5A CN201610428530A CN106198921A CN 106198921 A CN106198921 A CN 106198921A CN 201610428530 A CN201610428530 A CN 201610428530A CN 106198921 A CN106198921 A CN 106198921A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of subway shield tunnel construction Disturbance Model assay device and test method thereof.Including model groove, simulation driving system, filling system and monitoring system, the model groove dress soil body, the soil body is built with simulation driving system, and filling system connects simulation driving system, monitoring system is embedded in the soil body of model groove, the parameter before and after gathering soil body test disturbance；Modulation serosity is placed in slurry storing tank, simulation shield shell is extracted out according to simulated condition shield speed level, inject serosity to simulating around lining cutting by grouting pump simultaneously, by monitoring system acquisition Monitoring Data, block in the middle part of the model soil body, observed obtaining serosity result of the test of range of scatter in the soil body by section.The assay device used in the present invention is the most reusable, the synchronous grouting technique under different operating mode is repeatedly simulated with less cost, determination data is more comprehensive, provides reference for practice of construction, may advantageously facilitate the mechanism to surrounding soil disturbing influence and the research of principle.
Description
Technical field
The present invention relates to a kind of subway shield tunnel construction Disturbance Model assay device and test method thereof, belong to hypogee
Field of engineering technology, studies for subway shield tunnel construction disturbance simulation laboratory test.
Background technology
In Analysis on Shield Tunnel Driven Process, constantly tunnel section of jurisdiction along with shield machine and also constantly install at shield tail, due to section of jurisdiction external diameter
Less than shield shell external diameter, shield tail space constantly produces.Owing to around tunnel, bury self-stable ability is poor, if shield tail space can not be timely
Filling can cause surrounding formation Collapse Deformation.Wherein the grouting parameter such as grouting pressure, grouting amount controls technology is crucial.Slip casting pressure
Power and grouting amount are too small, it is impossible to meet the requirement filling shield tail space, and the tunnel perimeter soil body will be caused actively to destroy, and the soil body occurs
Collapse Deformation；Deform excessive, the passive extruding of the soil body can be caused again to destroy and the waste of serosity.Therefore, understand metro shield to execute
The mechanism of work disturbance is most important.
Test in situ have testing cost high, artificial put into big, measure that cycle length, field condition be complicated, the soil body not
The features such as uniformity is big, construction parameter is unstable, the data discrete that on-the-spot test obtains is bigger.Model test is a kind of science
The important means of research, the most helpful to researchs such as the formation displacements relevant to Tunnel Engineering.Compared to test in situ,
Model test has model ground base density, uniformity controlled, and boundary condition is controlled, construction parameter controllable precise, response can be supervised in real time
The advantages such as survey.Model test can strictly control the impact of various irrelevant variable, can set various operating condition of test simultaneously.This
Outward, the model test test period is short, low cost, it is simple to carries out substantial amounts of test, it is thus achieved that mass data, is suitable for disturbance theory
Research.
Summary of the invention
In order to solve problem present in background technology, it is an object of the invention to provide a kind of subway shield tunnel construction disturbance
Model test apparatus and test method thereof, can simulate the process that the soil body produces in shield tunneling process disturbance, can simulate difference
The operating modes such as driving speed and different grouting pressures, provide a platform for shield-tunneling construction mechanism of disturbance research.
It is an object of the invention to be achieved through the following technical solutions:
One, a kind of subway shield tunnel construction Disturbance Model assay device:
Device includes the model groove for housing the soil body, simulation driving system, filling system and monitoring system, and model groove fills
For simulating the soil body of subway shield tunnel construction environment in having, the soil body is built with simulation driving system, and filling system connects simulation pick
Entering system and control slip casting, monitoring system is installed on the soil body of model groove, the parameter before and after gathering soil body test disturbance.
Described simulation driving system includes the simulation shield shell being horizontally placed in model groove and simulation lining cutting, is filled in model
The model soil body in groove and the simulation shield driving device being placed in outside model groove, simulation shield shell uses gapless stainless steel tube as outward
Pipe, simulation lining cutting uses stainless steel tube to penetrate installation as inner tube, the simulation shield shell areole from model groove side, simulate lining cutting
Penetrating installation from the areole of model groove opposite side, simulation shield valve jacket is outside simulation lining cutting, between simulation shield shell and simulation lining cutting
Gap in axially spaced be provided with many Grouting Pipe, Grouting Pipe is axial arranged along simulation shield shell, and Grouting Pipe connects filling system,
Simulation shield driving device connect simulation shield shell be positioned at the one end outside model groove, by its electric motor operating band dynamic model intend shield shell to
Outer promotion.
Described model groove is the side rectangular bar of steel frame structure with observing function lucite plate washer, at minor face
On sidewall, opened round mouth installs simulation driving system.
Described Grouting Pipe outer end connects filling system, and Grouting Pipe the inner extends to simulate shield shell and is positioned at model groove inner end
Edge, and simulation shield shell end edge in model groove medial wall and simulation lining cutting lateral wall between be provided with Guan Mi
Seal, seal of tube circle has the groove passed for Grouting Pipe, and Grouting Pipe the inner extends to notch and slurry is noted simulation lining cutting
In shield tail space around.
Described Grouting Pipe and seal of tube circle are each attached to simulate the medial wall of shield shell.
One end that described simulation lining cutting is positioned at outside model groove is provided with flange, and simulation lining cutting passes through flange axial limiting at mould
Type groove sidewall.
It is provided with the groove sealing ring for sealing between described simulation shield shell and the areole of model groove.
Described filling system includes that slurry storing tank, effusion meter, piezometer, grouting pump and main sending starch pipe, slurry storing tank and slip casting
The input of pump connects, and slip casting delivery side of pump send slurry pipe to be connected with Grouting Pipe through main, and grouting pump is provided with effusion meter and pressure
Meter, master is provided with, in sending slurry pipe, the ball valve controlling opening and closing.
Dial gauge that described monitoring system includes being arranged in the soil body, flexural piezoelectric unit, soil pressure cell, pore pressure meter, miniature
Inclinometer, miniature four-bladed vane and miniature feeler inspection.
Two, a kind of subway shield tunnel construction Disturbance Model test method, comprises the steps:
1) use described device, in model groove, insert the model soil body as simulation subway shield tunnel construction environment, then
Be compacted successively, add water after stand；
2) it is embedded in the model soil body after simulation shield shell and simulation lining cutting being socketed completely through model groove, is further filled with model clay
Body also tamps, make simulation shield shell and simulation lining cutting all with the close contact of the model soil body, continue to insert the model soil body to preset height,
Embedding monitoring system when banketing；
3) modulation serosity is placed in the slurry storing tank of filling system, extracts mould out according to the simulated condition slow level of shield speed
Plan shield shell, injects serosity to simulating around lining cutting by grouting pump while extracting simulation shield shell out；
4) by monitoring system acquisition Monitoring Data during extracting simulation shield shell out；
5) after simulation shield shell is fully drawn out model groove, stop slip casting, from the model soil body, take out monitoring system, by model
The soil body take out tailing edge be perpendicular to simulate shield columella to plane block in the middle part of the model soil body, by observe soil body truncation surface obtain
Serosity is the result of the test of range of scatter in the soil body.
The described model soil body is identical with the soil body of subway shield tunnel construction environment.
The modulation of described serosity, during in strict accordance with serosity severe, initial yield intensity, initial viscosity, bleeding rate with condensation
Between the corresponding likelihood ratio convert, utilize rotating cylinder viscometer preparation to check the model serosity that the likelihood ratio requires；Model serosity
Primary raw material is Calx, flyash, medium-fine sand, swelled ground, additive, water.
Described step 3) in by controlling the change of pinion ratio of electric motor, it is achieved under different shield driving speed
Construction disturbance test；Controlled by dosing pump piston displacement, it is achieved the construction disturbance test under different grouting amounts.
The invention has the beneficial effects as follows:
1. the assay device used in the present invention all can be reused, and an experimental period is about about one week.
Therefore, it can, by controlling grouting pressure and the difference of grouting amount, repeatedly simulate the synchronization under different operating mode with less cost
Grouting process.
2. a cycle can carry out multiple construction section, each construction section can be monitored in real time soil pressure, pore pressure, earth's surface sink
The construction parameters such as fall, shear wave velocity, deviational survey, soil body density, soil strength, determination data is more comprehensive, can complete subway
The overall process monitoring of shield-tunneling construction disturbance physical modeling.
3., on the basis of great number tested data, in the research subway shield tunnel construction that system is detailed, grouting process is to soil around
The mechanism of body disturbing influence and principle, and probe into the universal law of range of disturbance and the same grouting process of subsidence value.And then
Study, verify existing slip-casting lifting technology, provide reference for practice of construction, and propose improvement project.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of apparatus of the present invention；
Fig. 2 is that monitoring section arranges schematic diagram；
Fig. 3 is shield tail space close-up schematic view at this embodiment B；
Fig. 4 is close-up schematic view at this embodiment C；
Fig. 5 is close-up schematic view at this embodiment D；
Fig. 6 is that this embodiment monitoring section arranges schematic diagram；
In figure: model groove 1, simulation shield shell 2, Grouting Pipe 3, the model soil body 4, simulation lining cutting 5, slurry storing tank 6, effusion meter 7, pressure
Power meter 8, grouting pump 9, main sending starch pipe 10, simulation shield driving device 11, monitoring system 12, shield tail space 13, dial gauge 14, piezoelectricity
Flexure element 15, soil pressure cell 16, pore pressure meter 17, miniature inclinometer 18, miniature four-bladed vane 19, miniature feeler inspection 20, seal of tube circle 21, groove
Sealing ring 22.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, the present invention includes the model groove 1 for housing the soil body, simulation driving system, filling system and monitoring
System 12, model groove 1 is equipped with the interior soil body for simulating subway shield tunnel construction environment, and the soil body is built with simulation driving system, note
Slurry system connects simulation driving system and controls slip casting, and monitoring system 12 is installed on the soil body of model groove 1 and gathers test data.
Simulation driving system includes the simulation shield shell 2 being horizontally placed in model groove 1 and simulation lining cutting 5, is filled in model groove 1
In the model soil body 4 and the simulation shield driving device 11 that is placed in outside model groove 1, simulation shield shell is used for simulating actual subway work
Shield machine, simulation shield shell 2 uses gapless stainless steel tube as outer tube, and simulation lining cutting 5 uses stainless steel tube as inner tube, simulation
The shield shell 2 areole from model groove 1 side penetrates installation, and simulation lining cutting 5 penetrates installation from the areole of model groove 1 opposite side,
Simulation shield shell 2 is enclosed within outside simulation lining cutting 5.After simulation shield shell 2 and simulation lining cutting 5 socket-connect, as in figure 2 it is shown, simulation shield shell 2 and mould
Intending axially spaced in the gap between lining cutting 5 being provided with many Grouting Pipe 3, Grouting Pipe 3 is axial arranged along simulation shield shell 2, slip casting
Pipe 3 connects filling system, and simulation shield driving device 11 connects simulation shield shell 2 and is positioned at the one end outside model groove 1, by its electronic electricity
Machine operating band dynamic model is intended shield shell 2 and is pushed out.Described simulation shield driving device can realize displacement and accurately control, can be by controlling
The change of the pinion ratio of electric motor, simulates different shield driving speed.
Grouting Pipe 3 outer end connects filling system, and Grouting Pipe 3 the inner extends to simulate shield shell 2 and is positioned at model groove 1 inner end
Edge, and it is provided with pipe between the medial wall of the simulation shield shell 2 end edge in model groove 1 and simulation lining cutting 5 lateral wall
Sealing ring 21, as shown in Figure 3 and Figure 5, seal of tube circle 21 has the groove passed for Grouting Pipe 3, and Grouting Pipe 3 the inner extends to
Notch is noted slurry in the shield tail space 13 around simulation lining cutting 5.
Grouting Pipe 3 and seal of tube circle 21 are each attached to simulate the medial wall of shield shell 2, and welding manner can be used to fix.
One end that simulation lining cutting 5 is positioned at outside model groove 1 is provided with flange, and simulation lining cutting 5 passes through flange axial limiting at model
Groove 1 sidewall so that when simulation shield shell 2 moves axially outward, simulation lining cutting 5 will not follow movement.
As shown in Figure 4, the groove sealing ring 22 for sealing it is provided with between simulation shield shell 2 and the areole of model groove 1.
Filling system includes that slurry storing tank 6, effusion meter 7, piezometer 8, grouting pump 9 and main sending starch pipe 10, slurry storing tank 6 and slip casting
The input of pump 9 connects, and the outfan of grouting pump 9 send slurry pipe 10 to be connected with Grouting Pipe 3 through main, and grouting pump 9 is provided with effusion meter 7
With piezometer 8, master is provided with, in sending slurry pipe 10, the ball valve controlling opening and closing.Grouting pump 9 is the dosing pump that can accurately control grouting amount.
As shown in Figure 6, monitoring system 12 include being arranged in the soil body for measure soil body sedimentation dial gauge 14, for
Measure the flexural piezoelectric unit 15 of shear wave velocity, for measuring the soil pressure cell 16 of soil pressure, for measuring the pore pressure of pore water pressure
Count 17, for measuring the miniature inclinometer 18 of soil internal horizontal displacement, for measuring the miniature four-bladed vane of soil shear strength
19 and for measuring the miniature feeler inspection 20 of degree of compaction and intensity, dial gauge 14, flexural piezoelectric unit 15, soil pressure cell 16, pore pressure meter 17,
Miniature inclinometer 18, miniature four-bladed vane 19 and miniature feeler inspection 20 are respectively arranged in monitoring section.It is disconnected that dial gauge 14 is installed on monitoring
Face soil body surface is at perpendicular axis of symmetry 0R, 2/3R, 4/3R, 2R, 3R；Flexural piezoelectric unit 15 symmetrical inclined 45 degree is installed on away from simulation lining
Build at the 2R of the center of circle；Soil pressure cell 16 is installed in horizontal symmetry axis, at perpendicular axis of symmetry 2R, 3R；Pore pressure meter 17 is installed on simulation lining
Above the block center of circle at 2R, left side 1.5R/2R, lower section 2R/3R, right 2.5R；Miniature inclinometer is isometric with the soil body degree of depth, wide
Organic thin glass sheet of 2cm thickness 2mm, posts foil gauge, is respectively arranged at perpendicular axis of symmetry 1.5R, 2R, 3R；Miniature survey cross
Plate 19 may move with miniature feeler inspection 20.Above-mentioned R is simulation lining cutting internal diameter.
Monitoring system 12 can accurately measure the ginsengs such as the deformation before and after model soil disturbance, pore pressure, soil pressure, rigidity and intensity
Number, it is achieved the overall process of subway shield tunnel construction disturbance physical modeling is monitored.
The concrete process of the test of experimental provision of the present invention is as follows:
1) fixed model groove and driving means, inserts the model as simulation subway shield tunnel construction environment in model groove 1
The soil body 4, the model soil body 4 is identical with the soil body of subway shield tunnel construction environment, has similar moisture content and Atterberg Limit, by model clay
Body divides 4 layers to insert model groove 1 with the thickness of 10cm, compaction in layers successively, adds water, each prison of embedding monitoring system 12 when banketing
Survey device, three layers complete after be limited with the opening perimeter on model cell wall and to insert the soil of lower half circle both sides and compacting adds water；
2) it is embedded in model clay after φ 219mm simulation shield shell 2 and φ 203mm simulation lining cutting 5 being socketed completely through model groove 1
In body 4, it is further filled with the model soil body 4 and tamps, making simulation shield shell 2 and simulation lining cutting 5 all be in close contact with the model soil body 4, continue
Insert the model soil body 4 and arrive at simulation shield shell outer wall 18cm, each monitoring devices of embedding monitoring system 12 when banketing；
3) modulation serosity, puts into enough model serosity in slurry storing tank 6, the modulation of serosity in strict accordance with serosity severe, just
The likelihood ratio that beginning yield strength, initial viscosity, bleeding rate are corresponding with setting time converts, and utilizes rotating cylinder viscometer preparation multiple
The model serosity that the core likelihood ratio requires.
The primary raw material of the model serosity being embodied as is Calx 100kg/m3, flyash 400kg/m3, medium-fine sand 600kg/
m3, swelled ground 50kg/m3, additive 3kg/m3, water 320kg/m3。
4) suitable gear ratio is set for simulation shield driving device 11, pulls simulation shield shell 2 with identical by carriage
Speed is moved to the left, and extracts simulation shield shell 2 out according to the simulated condition slow level of shield speed 20cm/h, to simulate actual subway shield
The traveling of structure machine, controls grouting pump 9 flow and makes it meet likelihood ratio 1:30 and by Grouting Pipe 3 while extracting simulation shield shell 2 out
Inject shield tail space 13, grouting pressure 9kpa, 12kpa, grouting amount 3.27cm3/s、3.92cm3/s；
5) during extracting simulation shield shell 2 out, Monitoring Data is gathered by monitoring system 12；
In test, on the one hand by controlling the change of the pinion ratio of electric motor, it is achieved different shield driving speed
Under construction disturbance test, on the other hand control by dosing pump piston displacement, it is achieved the construction disturbance under different grouting amounts tries
Test.
6) after simulation shield shell 2 is fully drawn out model groove 1, stop slip casting, from the model soil body 4, take out monitoring system 12
Each monitoring devices, takes out the model soil body 4 tailing edge and is perpendicular to simulate the axial plane of shield shell 2 and blocks in the middle part of the model soil body 4,
Serosity result of the test of range of scatter in the soil body is obtained by observing soil body truncation surface.
This real case simulation operating mode of the U-shaped test section of subway Line 1, the data obtained and on-the-spot in situ shear wave, survey
Tiltedly, pore pressure, settling data more consistent, preferably subway shield tunnel construction disturbance can be carried out Whole Process Simulation and monitoring.
Claims (10)
1. a subway shield tunnel construction Disturbance Model assay device, it is characterised in that: include the model groove for housing the soil body
(1), simulating driving system, filling system and monitoring system (12), model groove (1) is built with being used for simulating subway shield tunnel construction ring
The soil body in border, the soil body is built with simulation driving system, and filling system connects simulation driving system and controls slip casting, monitoring system (12)
It is installed on the soil body of model groove (1), the parameter before and after gathering soil body test disturbance.
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 1, it is characterised in that: described mould
Intend driving system to include simulation shield shell (2) being horizontally placed in model groove (1) and simulation lining cutting (5), be filled in model groove (1)
The model soil body (4) and be placed in model groove (1) simulation shield driving device (11) outward, simulation shield shell (2) use seamless stainless
Steel pipe is as outer tube, and simulation lining cutting (5) uses stainless steel tube as inner tube, simulation shield shell (2) sidewall from model groove (1) side
Hole penetrates installation, and simulation lining cutting (5) penetrates installation from the areole of model groove (1) opposite side, and simulation shield shell (2) is enclosed within simulation lining
Build (5) outward, axially spaced in simulation shield shell (2) and the gap simulated between lining cutting (5) be provided with many Grouting Pipe (3), slip casting
Pipe (3) is axial arranged along simulation shield shell (2), and Grouting Pipe (3) connects filling system, and simulation shield driving device (11) connects simulation shield
Shell (2) is positioned at model groove (1) one end outward, intends shield shell (2) by its electric motor operating band dynamic model and pushes out.
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 2, it is characterised in that: described note
Slurry pipe (3) outer end connects filling system, and Grouting Pipe (3) the inner extends to simulate shield shell (2) and is positioned at the limit of model groove (1) inner end
Edge, and set between medial wall and simulation lining cutting (5) lateral wall simulating the end edge that shield shell (2) is positioned at model groove (1)
Having seal of tube circle (21), seal of tube circle (21) has the groove passed for Grouting Pipe (3), Grouting Pipe (3) the inner extends to groove
Mouth is noted slurry in simulation lining cutting (5) shield tail space (13) around.
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 2, it is characterised in that: described note
Slurry pipe (3) and seal of tube circle (21) are each attached to simulate the medial wall of shield shell (2).
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 2, it is characterised in that: described mould
Plan lining cutting (5) is positioned at model groove (1) one end outward and is provided with flange, and simulation lining cutting (5) passes through flange axial limiting in model groove (1)
Sidewall.
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 2, it is characterised in that: described mould
Intend being provided with between shield shell (2) and the areole of model groove (1) the groove sealing ring (22) for sealing.
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 1, it is characterised in that: described note
Slurry system includes slurry storing tank (6), effusion meter (7), piezometer (8), grouting pump (9) and main slurry pipe (10) that send, slurry storing tank (6) and note
The input of stock pump (9) connects, and the outfan of grouting pump (9) send slurry pipe (10) to be connected with Grouting Pipe (3) through main, grouting pump (9)
It is provided with effusion meter (7) and piezometer (8), the main ball valve sending slurry to be provided with control opening and closing in managing (10).
A kind of subway shield tunnel construction Disturbance Model assay device the most according to claim 1, it is characterised in that: described prison
Dial gauge (14) that examining system (12) includes being arranged in the soil body, flexural piezoelectric unit (15), soil pressure cell (16), pore pressure meter (17),
Miniature inclinometer (18), miniature four-bladed vane (19) and miniature feeler inspection (20).
9. a subway shield tunnel construction Disturbance Model test method, it is characterised in that use the arbitrary described device of claim 1-8,
Employing following steps:
1) in model groove (1), insert the model soil body (4) as simulation subway shield tunnel construction environment, be compacted the most successively, add
Stand after water；
2) shield shell (2) will be simulated and simulation lining cutting (5) will pass after model groove (1) is socketed completely and is embedded in the model soil body (4), then fill out
Enter the model soil body (4) and tamp, making simulation shield shell (2) and simulation lining cutting (5) all be in close contact with the model soil body (4), continue to fill out
Enter the model soil body (4) to preset height, embedding monitoring system (12) when banketing；
3) modulation serosity is placed in the slurry storing tank (6) of filling system, extracts mould out according to the simulated condition slow level of shield speed
Intend shield shell (2), while extracting simulation shield shell (2) out, inject serosity to simulation lining cutting (5) around by grouting pump (9)；
4) during extracting simulation shield shell (2) out, Monitoring Data is gathered by monitoring system (12)；
5) it is fully drawn out model groove (1) in simulation shield shell (2) and stops slip casting afterwards, from the model soil body (4), take out monitoring system
(12), the model soil body (4) taking-up tailing edge is perpendicular to simulate the axial plane of shield shell (2) and blocks at the model soil body (4) middle part, logical
Cross observation soil body truncation surface and obtain serosity result of the test of range of scatter in the soil body.
A kind of subway shield tunnel construction Disturbance Model test method the most according to claim 9, it is characterised in that: described
The model soil body (4) is identical with the soil body of subway shield tunnel construction environment.
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