CN105911249A - Test method for simulating erosion loss of sandy soil layer surrounding shield tunnel segment seam - Google Patents
Test method for simulating erosion loss of sandy soil layer surrounding shield tunnel segment seam Download PDFInfo
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- CN105911249A CN105911249A CN201610224037.1A CN201610224037A CN105911249A CN 105911249 A CN105911249 A CN 105911249A CN 201610224037 A CN201610224037 A CN 201610224037A CN 105911249 A CN105911249 A CN 105911249A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention relates to a test method for simulating the erosion loss of a sandy soil layer surrounding a shield tunnel segment seam. An apparatus used in the invention comprises an air pump, a main test system, a pressure water tank system and a data acquisition system, and the main test system comprises a main test box with the bottom being opened; the upper portion of the main test box is provided with a sealing top cover, and the top cover is connected with a detachable pressurization airbag and is fixedly provided with a precise pressure regulating valve and a digital display pressure gauge; the lower portion of the main test box is provided with a miniature vibrating wire piezometer and a miniature earth pressure gauge; and the bottom of the main test box is in sealing connection with two L-shaped adjustable baseboards through an elastic sealing gasket and an L-shaped baseboard elastic sealing gasket which are arranged at the lower portion of the main test portion, the two L-shaped adjustable baseboards are connected through screws, and the two L-shaped adjustable baseboards are provided with grooves used for fixing the L-shaped baseboard elastic sealing gasket. The screws are adjusted in the test process to make the seam width be consistent with the open amount of a shield tunnel segment. The method can be used to assess the erosion condition of different types of soil surrounding the seam.
Description
Technical field
The present invention relates to a kind of simulate the test method of sandy soils erodsion loss around duct pieces of shield tunnel seam, it is right to be primarily adapted for use in
The erodsion loss situation of shield duct piece surrounding soil is estimated and predicts.
Background technology
Shield tunnel is usually and is formed, due to the differential settlement in tunnel so that in tunnel by many water-tight concrete pipe sheet assemblings
During construction and operation, being susceptible to localized seepage, the fine particle in the soil body is easily taken out of by seepage, is formed and corrodes.Office
Portion corrodes and makes shield duct piece lose soil body support, deals with improperly, will form disaster, causes huge environmental effect and economic loss.
Monitoring and evaluation shield tunnel seam surrounding soil erodsion loss situation, both can reflect the degree of disease of shield duct piece, the most permissible
Development to tunnel defect is predicted, and has great practical significance.
Traditional test method is only limited to test the water resistance of section of jurisdiction elastic sealing gasket, such as " the waterproof material of macromolecule
Expect the 4th part: shield tunnel section of jurisdiction rubber gasket " utilize simulation section of jurisdiction " T " described in (GB 18173.4 2010)
The test method that the water pressure resistance testing device of type and " one " type assembly seam is carried out, does not all have be considered wherein by the soil body, only
It it is the waterproof test merely carrying out elastic sealing gasket.Tunnel seam is easy leakage area, after seam is leaked, and the soil body about
Erosion in various degree and loss, tunnel generation disease will be there is.Need differentiation and the assessment of a set of rational tunnel defect at present badly
Method, carries out specific aim with the tunnel to the phase of military service and periodically protects.
Summary of the invention
The present invention solves that technical problem present in known technology provides sandy soils around a kind of simulation duct pieces of shield tunnel seam
The test method of erodsion loss, the method makes the erosion degree of assessment segment joint surrounding soil be possibly realized.
The present invention solves that technical problem is adopted the technical scheme that present in known technology:
A kind of simulate the test method of sandy soils erodsion loss around duct pieces of shield tunnel seam, the testing equipment used, including:
Including air pump system (1), master trip system (2), pressurised water tank system (3) and data collecting system (4), wherein, described
Master trip system (2) the master trip case (17) of bottom opening that includes support (32), be fixed on support (32)；Main examination
The top of tryoff (17) is provided with top pressure closure (16), top cover is connected with detachable pressurised airbag (23) and is fixed with accurate tune
Pressure valve (13) and digital display manometer (12), precise pressure regulating valve (13) is connected to described air pump system (1) and detachably adds
Between pressuring gasbag (23), it is used for controlling the air pressure of detachable pressurised airbag (23), digital display manometer (12) is used for controlling,
Show the atmospheric pressure value of detachable pressurised airbag (23)；Master trip case (17) is additionally provided with and is connected to detachable pressurised airbag (23)
Venting valve (14) and be connected to the water intaking valve (25) of pressurised water tank system (3)；
The bottom of master trip case (17) and the two pieces of adjustable base plate of L-types (26) are by master trip lower box part elastic sealing gasket (28)
It is tightly connected with L-type base plate elastic sealing gasket (29), is connected by leading screw (27) between the two pieces of adjustable base plate of L-types (26),
Have groove the two pieces of adjustable base plate of L-types (26), be used for fixing L-type base plate elastic sealing gasket (29)；
The bottom of master trip case (17) is soil body container, and is provided with miniature ventage piezometer (22) and miniature earth pressure gauge (21)；
The signal that both gather is admitted to data collecting system (4)；
It is for accepting and measuring the soil sample (24) leaked down and Lou sand measuring instrument (24) that leak of water in the lower section of master trip case (17)；
This test method follows the steps below:
(1) after pilot system assembles, the leading screw (27) at regulation L-type adjustable base plate (26) place, make two pieces of L-types adjustable
Seam width between base plate (26) reaches sealing gasket theory minimum joint open, this seam width correspondence duct pieces of shield tunnel joint open, fixing L
Type is adjustable base plate (26)；
(2) loading the soil sample (24) of simulation shield tunnel present position in master trip case (17), soil sample (24) is taked point
Layer filling is also compacted, and is filled at 2/3 graduation mark that master trip case (17) is internal；
(3) close and connected top cover plate (16) the good seal of detachable pressurised airbag (23), and open data acquisition
Collecting system (4), prepares to start to gather test data；
(4) open air pump system (1), detachably added to master trip system (2) inside by top precise pressure regulating valve (13)
Pressuring gasbag (23) applies air pressure, and air bag acts on soil body surface, applies soil pressure for soil sample (24)；
(5) leading screw 27 is utilized to regulate the seam width of two pieces of adjustable base plates of L-type 26 to engagement slot width；
(6) regulation pressurised water tank system (3) is to predetermined altitude, opens outlet valve (8) and the master of pressurised water tank system (3)
The water intaking valve (25) of pilot system (2)；
(7) subsoil water flows out from seam crossing, drives soil particle generation erodsion loss around seam, thus records certain Seepage flow time
The erodsion loss amount that different hydraulic pressure (flow) are corresponding, terminates test.
Preferably, the top of master trip case is sealedly connected with top cover plate (16) by square O RunddichtringO (20).
Master trip case (17) offers observation window (18).
The present invention has the advantage that with good effect: pilot system can simulate the seepage impact for the soil body, can be easily
Around abutment joint, the erosion condition of the dissimilar soil body is estimated and predicts, provides reference for engineering reparation；Air pump system, add
Pressure cistern system and leading screw can realize the accurate control to test.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the master trip system three-dimensional cutaway view of the present invention；
Fig. 3 is the master trip case three-dimensional cutaway view of the present invention；
Fig. 4 is the L-type adjustable base plate perspective view of the present invention；
Fig. 5 is the master trip lower box part elastic sealing gasket of the present invention and lower L-type base plate elastic sealing gasket perspective view.
In figure: 1, air pump system；2, master trip system；3, pressurised water tank system；4, data collecting system；5, water tank；
6, water intaking valve；7, outlet；8, outlet valve；9, Acquisition Instrument；10, data analysis system；11, display；12, number
Aobvious Pressure gauge；13, precise pressure regulating valve；14, venting valve；15, upper cap crab bolt；16, top cover plate；17, main examination
Tryoff；18, observation window；19, Water filling valve；20, square O RunddichtringO；21, miniature earth pressure gauge；22, micro-hole
Gap hydraulic pressure gauge；23, detachable pressurised airbag；24, soil sample；25, water intaking valve；26, the adjustable base plate of L-type；27, leading screw；
28, master trip lower box part elastic sealing gasket；29, L-type base plate elastic sealing gasket；30, bed bolt；31, frame upper spiral shell
Bolt；32, support；33, bearing chassis；34, support lower bolt；35, bearing roller；36, leak Lou sand measuring instrument.
Detailed description of the invention
The present invention will be described below in conjunction with the accompanying drawings:
Master trip system needed for the present invention as it is shown in figure 1, refer to Fig. 1～Fig. 5, the elastic sealing gasket of the present invention, soil, water
Coefficient shield tunnel leak test system, including air pump system 1, master trip system 2, pressurised water tank system 3, data
Acquisition system 4；Air pump system 1 is connected by flexible pneumatic hose with master trip system 2；Pressurised water tank system 3 is positioned at test institute
The height and position specified needed, pressurised water tank system 3 is connected by water pipe with master trip system 2；Data collecting system 4 is with main
Pilot system 2 is connected by data conductor.
Described master trip system include digital display manometer 12, precise pressure regulating valve 13, venting valve 14, top cover plate 16, on
Portion's cover plate bolt 15, Water filling valve 19, master trip case 17, detachable pressurised airbag 23, water intaking valve 25, miniature earth pressure gauge 21,
Miniature ventage piezometer 22, observation window 18, L-type is adjustable base plate 26, bed bolt 30, leading screw 27, master trip lower box part bullet
Property sealing gasket 28, L-type base plate elastic sealing gasket 29, support 32, frame upper bolt 31, support lower bolt 34, bearing
Chassis 33, bearing roller 35, leak Lou sand measuring instrument 36；Digital display manometer 12 is by flexible pneumatic hose and air pump system 1
Being connected, digital display manometer 12 is connected to the upper end of precise pressure regulating valve 13, and precise pressure regulating valve 13 lower end is fixed on top cover plate 16
Going up and connect the detachable pressurised airbag 23 being fixed on top cover plate 16, venting valve 14 and Water filling valve 19 are fixed on
On portion's cover plate 16, top cover plate 16 is connected, in top cover plate 16 and main examination by upper cap crab bolt 15 with master trip case 17
Being square O RunddichtringO 20 in U-lag between tryoff 17, main viewfinder 18 is sealed by plastic-steel mud and is fixed on master trip case 17
On, miniature ventage piezometer 22 and miniature earth pressure gauge 21 are affixed on master trip case 17 back side inwall and left side L-type adjustable 26 ends
Plate upper surface, wire drawn by seal and is connected with data collecting instrument 9, and water intaking valve 25 one end is positioned at master trip case 17
Sidewall, water intaking valve 25 other end is connected with pressurised water tank system 3 by water pipe, and water intaking valve 25 has the function of overflow pipe concurrently,
Two pieces, the bottom adjustable base plate of L-type 26 is connected by bed bolt 30 with master trip case 17, the adjustable base plate of L-type 26 and master
L-type base plate elastic sealing gasket 29 and master trip lower box part elastic sealing gasket 28, two pieces of L-types are had in U-lag between proof box 17
Being connected by leading screw 27 between adjustable base plate 26, master trip case 17 is connected with support 32 by frame upper bolt 31,
Frame 32 is connected with bearing chassis 33 by support lower bolt 34, and bearing roller 35 is fixed on bearing chassis 33；Leak
Leakage sand measuring instrument 36 is between two pieces of adjustable base plates of L-type 26 below gap, and the Lou sand measuring instrument 36 of leaking transparent is had by identical
Machine glass guide channel is combined into
Top cover plate 16 seals master trip case 17 by square O RunddichtringO 20, and L-type is adjustable, and base plate 26 is divided into two pieces, both
Can seal bottom master trip case 17, section of jurisdiction elastic sealing gasket can be simulated again, it is also possible to regulation seam joint open size；Special
Air pressure can be converted into and act on soil body surface soil pressure by detachable pressurised airbag 23；Bottom self-control is leaked Lou, and sand measuring instrument 36 can
Obtain the leakage sand in different time, water leakage.
Pressurised water tank system includes water intaking valve 6, water tank 5, outlet 7 and outlet valve 8；Tank intake valve of water 6 is positioned at water tank 5 side
At wall, outlet valve 8 is positioned at bottom water tank 5, and outlet valve 8 is connected by water pipe with master trip system 2.
Data collecting system includes data collecting instrument 9, data analysis system 10, display 11；Acquisition Instrument 9 and master trip system
2 are connected by data conductor, and Acquisition Instrument 9 is connected by data conductor with data analysis system 10, and data analysis system 10 is with aobvious
Show that device 11 is connected by data conductor.
It is embodied as step as follows:
(1), after pilot system assembles according to accompanying drawing, at the regulation adjustable base plate of L-type, the leading screw 27 of 26, makes two pieces of L-types can
Adjust the seam width between base plate 26 to reach minimum joint open in theory, then tighten bed bolt 30 so that L-type is adjustable base plate 26
Position be fixed up；
(2) loading the soil sample 24 of shield tunnel present position in master trip case 17, soil sample 24 is taked layering filling and is compacted,
It is filled at 2/3 graduation mark within master trip case 17；
(3) close and connected the top cover plate 16 of detachable pressurised airbag 23, tighten upper cap crab bolt 15, and open
Data collecting system 4, prepares to start to gather test data；
(4) air pump system 1 is opened, by top precise pressure regulating valve 13 to the internal detachable pressurised airbag 23 of master trip system 2
Applying air pressure, air bag acts on soil body surface, applies soil pressure for soil sample 24；
(5) leading screw 27 is utilized to regulate the seam width of two pieces of adjustable base plates of L-type 26 to engagement slot width；
(6) regulation pressurised water tank system 3 to predetermined altitude, opens outlet valve 8 and the master trip system 2 of pressurised water tank system 3
Water intaking valve 25.
(7) water flows out from seam crossing, drives soil particle generation erodsion loss around seam, thus it is different to record certain Seepage flow time
The erodsion loss amount that hydraulic pressure (flow) is corresponding, terminates test.
Claims (3)
1. simulating a test method for sandy soils erodsion loss around duct pieces of shield tunnel seam, the testing equipment used includes: include air pump
System (1), master trip system (2), pressurised water tank system (3) and data collecting system (4), wherein, described master trip system (2) bag
The master trip case (17) of the bottom opening include support (32), being fixed on support (32)；The top of master trip case (17) is provided with top pressure closure
(16), top cover it is connected with detachable pressurised airbag (23) and is fixed with precise pressure regulating valve (13) and digital display manometer (12), precise pressure regulating valve (13)
It is connected between described air pump system (1) and detachable pressurised airbag (23), is used for controlling the air pressure of detachable pressurised airbag (23), number
Aobvious Pressure gauge (12) is used for controlling, showing the atmospheric pressure value of detachable pressurised airbag (23)；Master trip case (17) is additionally provided with and is connected to detachably
The venting valve (14) of pressurised airbag (23) and be connected to the water intaking valve (25) of pressurised water tank system (3)；
The bottom of master trip case (17) and the two pieces of adjustable base plate of L-types (26) are by master trip lower box part elastic sealing gasket (28) and L-type base plate bullet
Property sealing gasket (29) be tightly connected, between the two pieces of adjustable base plate of L-types (26) by leading screw (27) connect, the two pieces of adjustable base plate of L-types (26)
Have groove, be used for fixing L-type base plate elastic sealing gasket (29)；
The bottom of master trip case (17) is soil body container, and is provided with miniature ventage piezometer (22) and miniature earth pressure gauge (21)；Both adopt
The signal of collection is admitted to data collecting system (4)；
It is for accepting and measuring the soil sample (24) leaked down and Lou sand measuring instrument (24) that leak of water in the lower section of master trip case (17).
This test method follows the steps below:
(1) pilot system assemble after, regulation L-type adjustable base plate (26) place leading screw (27), make the two pieces of adjustable base plate of L-types (26) it
Between seam width reach sealing gasket theory minimum joint open, this seam width correspondence duct pieces of shield tunnel joint open, the fixing adjustable base plate of L-type (26)；
(2) loading the soil sample (24) of simulation shield tunnel present position in master trip case (17), soil sample (24) is taked layering filling and is compacted,
It is filled at 2/3 graduation mark that master trip case (17) is internal；
(3) close and connected top cover plate (16) the good seal of detachable pressurised airbag (23), and open data collecting system (4),
Prepare to start to gather test data；
(4) air pump system (1) is opened, by top precise pressure regulating valve (13) to the internal detachable pressurised airbag (23) of master trip system (2)
Applying air pressure, air bag acts on soil body surface, applies soil pressure for soil sample (24)；
(5) leading screw 27 is utilized to regulate the seam width of two pieces of adjustable base plates of L-type 26 to engagement slot width；
(6) regulation pressurised water tank system (3) is to predetermined altitude, opens outlet valve (8) and the master trip system (2) of pressurised water tank system (3)
Water intaking valve (25)；
(7) subsoil water flows out from seam crossing, drives soil particle generation erodsion loss around seam, thus records certain Seepage flow time difference hydraulic pressure (stream
Amount) corresponding erodsion loss amount, terminates test.
Test method the most according to claim 1, it is characterised in that the top of master trip case is sealed by square O RunddichtringO (20)
Connect and have top cover plate (16).
Test method the most according to claim 1, it is characterised in that offer observation window (18) on master trip case (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610224037.1A CN105911249B (en) | 2016-04-12 | 2016-04-12 | Simulate the test method of sandy soils erodsion loss around duct pieces of shield tunnel seam |
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|---|---|---|---|
| CN201610224037.1A CN105911249B (en) | 2016-04-12 | 2016-04-12 | Simulate the test method of sandy soils erodsion loss around duct pieces of shield tunnel seam |
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| CN105911249B CN105911249B (en) | 2017-12-19 |
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| CN106321115A (en) * | 2016-11-08 | 2017-01-11 | 苏州大学 | Shielded tunnel structure model construction method |
| CN106769747A (en) * | 2016-11-17 | 2017-05-31 | 河海大学 | Experimental rig and its test method that soil body inflation resistance is oozed |
| CN108426706A (en) * | 2018-02-02 | 2018-08-21 | 西南交通大学 | A kind of high hydraulic pressure area shield formula TBM Segments Design test-beds |
| CN110044529A (en) * | 2019-03-28 | 2019-07-23 | 天津大学 | A kind of outer lateral earth pressure measurement method of shield tunnel |
| CN110702883A (en) * | 2019-10-31 | 2020-01-17 | 同济大学 | Shield tunnel leakage erosion simulation test device and method |
| CN111272629A (en) * | 2020-02-25 | 2020-06-12 | 天津大学 | Device for tunnel seepage erosion model test in sandy soil stratum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106769747A (en) * | 2016-11-17 | 2017-05-31 | 河海大学 | Experimental rig and its test method that soil body inflation resistance is oozed |
| CN108426706A (en) * | 2018-02-02 | 2018-08-21 | 西南交通大学 | A kind of high hydraulic pressure area shield formula TBM Segments Design test-beds |
| CN108426706B (en) * | 2018-02-02 | 2023-10-17 | 西南交通大学 | Shield type TBM tunnel segment design test bench for high water pressure area |
| CN110044529A (en) * | 2019-03-28 | 2019-07-23 | 天津大学 | A kind of outer lateral earth pressure measurement method of shield tunnel |
| CN110702883A (en) * | 2019-10-31 | 2020-01-17 | 同济大学 | Shield tunnel leakage erosion simulation test device and method |
| CN111272629A (en) * | 2020-02-25 | 2020-06-12 | 天津大学 | Device for tunnel seepage erosion model test in sandy soil stratum |
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| Publication number | Publication date |
|---|---|
| CN105911249B (en) | 2017-12-19 |
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