CN104121023B - Testing arrangement and the method for excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin - Google Patents

Testing arrangement and the method for excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin Download PDF

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Publication number
CN104121023B
CN104121023B CN201410312273.XA CN201410312273A CN104121023B CN 104121023 B CN104121023 B CN 104121023B CN 201410312273 A CN201410312273 A CN 201410312273A CN 104121023 B CN104121023 B CN 104121023B
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China
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mud
testing
breath
holding
pressure
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CN201410312273.XA
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Chinese (zh)
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CN104121023A (en
Inventor
朱伟
闵凡路
张宁
姜腾
张伯阳
姚占虎
夏鹏举
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河海大学
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Abstract

<b>The invention discloses testing arrangement and the method for excavation face mud film value of holding one's breath when a kind of slurry shield is with pressure to open the cabin, first in indoor testing column, carry out the film formed simulated test of mud in specific stratum, form and the similar mud film of actual conditions, then allow air pressure act directly on mud film, adopt the method for classification pressurization to carry out the mensuration of the mud film value of holding one's breath, test has reflected the effect of holding one's breath of mud film under gas pressure more accurately, has overcome scene and has carried out mud adjustment and the mud film value of holding one's breath and test length consuming time, uneconomical etc. problem. And method of testing involved in the present invention is simple, workload is little, consuming time short, and rapid adjustment can be carried out according to test result in scene, is a kind of mud film value of holding one's breath test mode of very fast less expensive.</b>

Description

Testing arrangement and the method for excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin

Technical field

The present invention relates to that a kind of slurry shield is with pressure to open the cabin under condition, the device and method of the value of holding one's breath of the mud film forming in indoor test excavation face, belongs to underground engineering field.

Background technology

The stratum such as many sandy gravels that can pass through high osmosis, high quartz content when China adopts the submerged tunnel that shield method builds; often meet with that cutter head of shield machine tool wear is serious, the situation such as cutterhead molding and barrier, and the operations such as cleaning or maintenance of being opened the cabin by forced-stopping machine. Have the impact of the waters such as river, lake, structures or other reasons owing to being subject to top, tunnel, the method for opening the cabin from earth's surface strengthening stratum normal pressure is limited, taking with pressure open the cabin method more and more used of engineering method as basis of calming the anger. The conventional engineering method of calming the anger is generally applicable to infiltration coefficient and is less than 10 -2 The soil layer of cm/s, is greater than 10 for infiltration coefficient -2 The coarse-grained soil stratum of cm/s, often adopts mud in excavation face, to form the householder methods such as the good mud film of holding one's breath property and reduces the gas permeability on stratum, ensures the stability of excavation face. Because mud film is a kind of special porous media, the maximum gas pressure value that it can bear is the size of the value of holding one's breath of mud film, the setting of pressure chamber internal gas pressure value while directly having determined with pressure opening the cabin. Therefore,, if can be before the enforcement of opening the cabin with pressure, the value of holding one's breath of the mud the film first mud of intending adopting being formed be tested, and can the mud proportioning of the use of opening the cabin and membrance casting condition be verified and be improved, and is conducive to safety of opening the cabin with pressure and carries out. And carry out at the scene the test of holding one's breath property of mud film, not only uneconomical, but also there is larger risk.

Summary of the invention

For addressing the above problem, the object of the present invention is to provide testing arrangement and the method for excavation face mud film value of holding one's breath when a kind of slurry shield is with pressure to open the cabin, can test fast specifically the value of holding one's breath of the mud film forming under layer condition and mud pressure condition.

In order to reach above object, the technical solution used in the present invention is: the testing arrangement of excavation face mud film value of holding one's breath that a kind of slurry shield is with pressure while opening the cabin, air compressor machine and air gauge that it comprises the testing column of tubulose, be connected with the top of testing column, be arranged on intake valve between testing column and air compressor machine, be positioned at testing column bottom discharge outlet, be positioned at the mud discharging mouth at testing column middle part.

Further, discharge outlet place is provided with the draining valve of controlling outlet switch.

Further, mud discharging mouth place is provided with the mud valve of controlling mud discharging mouth switch.

A method of testing of utilizing the testing arrangement of the excavation face mud film value of holding one's breath when above-mentioned slurry shield is with pressure to open the cabin, it comprises the following steps:

A. first in testing column, pack certain thickness sand particle into as drainage layer, on drainage layer, packing thickness into is the test stratum of 4 times of drainage layer thicknesses, while packing stratum into, controls the dry density on stratum, then adopts from lower and carries out the saturated of stratum from upper method;

B. in testing column, on saturated stratum, pack the roughly equal test mud of thickness and formation thickness into, the liquid level of mud and the top of testing column have certain distance, by testing column good seal, regulate air compressor machine and air gauge, set the atmospheric pressure value of mud infiltration, then open intake valve, make gas pressure on mud liquid level; While filling due to reality, due to the problem of gimmick and measurement, there is certain error, therefore say that thickness is roughly equal here, and can not accomplish definitely to equate;

C. open the discharge outlet of testing column bottom, measure the volume and weight of discharging liquid the seepage discharge that calculates mud, measure the thickness of mud film;

D. test is carried out after certain hour, closes the discharge outlet of testing column bottom, then opens the mud discharging mouth at testing column middle part, and the mud in testing column is all discharged;

E. close mud discharging mouth and intake valve, determine pressure rating and the action time of the test mud film value of holding one's breath, set after first order air pressure, open intake valve, air pressure is acted directly on mud film;

F. open discharge outlet, the seepage discharge under test first order gas pressure over time; If when seepage discharge temporal evolution amount is very little, after the variable quantity of flow to be infiltrated is stable, apply next stage air pressure, the seepage discharge under this grade of gas pressure of continuation test is over time;

If g., under certain one-level gas pressure, seepage discharge suddenly change is large, gas penetrate mud film subsequently, finishes test, and this corresponding stage pressure value is the value of holding one's breath of test mud formation mud film.

Further, in step a, the drainage layer packing in testing column is the single particle size gravel layer of particle size range 2mm-5mm.

Further, in step a, the stratum packing in testing column is the stratum of present position in the actual engineering of opening the cabin; In step b, the mud packing in testing column is the mud of intending use in the actual engineering of opening the cabin.

Further, in steps d, the time that test is carried out should be set according to the mud film formation time in concrete engineering.

Further, in step b, adopt flange that testing column is sealed.

Further, in step c, measure the volume of discharging liquid by beaker, measure the weight of discharging liquid by electronic scale.

Further, discharge outlet is to being connected to beaker, and beaker is placed on electronic scale, in step c and step f, measures the volume of discharging liquid by beaker, measures the weight of discharging liquid by electronic scale

Further, in step g, the value of holding one's breath of mud film refers to the maximum gas pressure value that mud film can bear, and in the time that air pressure is greater than the value of holding one's breath, ventilative phenomenon will appear in mud integumentary pattern mud film; In the time that air pressure is less than the value of holding one's breath, the mud film state of holding one's breath in completely.

Further, stratum is positioned on discharge outlet, the bottom of the corresponding mud of mud discharging mouth.

By adopting technique scheme, testing arrangement and the method for excavation face mud film value of holding one's breath that slurry shield of the present invention is with pressure while opening the cabin, first in indoor testing column, carry out the film formed simulated test of mud in specific stratum, form and the similar mud film of actual conditions, then allow air pressure act directly on mud film, adopt the method for classification pressurization to carry out the mensuration of the mud film value of holding one's breath, test has reflected the effect of holding one's breath of mud film under gas pressure more accurately, has overcome scene and has carried out mud adjustment and the mud film value of holding one's breath and test length consuming time, uneconomical etc. problem. And method of testing involved in the present invention is simple, workload is little, consuming time short, and rapid adjustment can be carried out according to test result in scene, is a kind of mud film value of holding one's breath test mode of very fast less expensive.

Brief description of the drawings

Accompanying drawing 1 is for forming mud film schematic diagram under the specific stratum of lab simulation and mud condition;

Accompanying drawing 2 is the mud film value of holding one's breath test schematic diagram;

Accompanying drawing 3 be in the Air-tight Test of 4 groups of different mud films seepage discharge with air pressure change and the mud film value of holding one's breath schematic diagram.

Number in the figure is:

1, testing column; 2, drainage layer; 3, stratum; 4, mud; 5, flange; 6, intake valve; 7, air gauge; 8, air compressor machine; 9, draining valve; 10, beaker; 11, electronic scale; 12, mud film; 13, scale paper; 14, mud valve.

Detailed description of the invention

Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have with the present invention under the identical meaning of the general understanding of those of ordinary skill in field. Should also be understood that such as those terms that define in general dictionary and should be understood to have the meaning consistent with meaning in the context of prior art, unless and definition as here, can not explain by idealized or too formal implication.

The implication of " connection " described in the present invention can be that the direct connection between parts can be also by the indirect connection of other parts between parts.

As depicted in figs. 1 and 2, the testing arrangement of excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin, air compressor machine 8 and air gauge 7 that it comprises the testing column 1 of tubulose, be connected with the top of testing column 1, be arranged on intake valve 6 between testing column 1 and air compressor machine 8, be opened in testing column 1 bottom discharge outlet, be opened in the mud discharging mouth at testing column 1 middle part. The top of testing column 1 offers air inlet, and air compressor machine 8 and air gauge 7 are connected on air inlet. Discharge outlet place is provided with the draining valve 9 of controlling outlet switch, and mud discharging mouth place is provided with the mud valve 14 of controlling mud discharging mouth switch. On the outer wall of testing column 1, be provided with scale paper 13. Discharge outlet is to being connected to a beaker 10, and beaker is placed on an electronic scale 11.

A kind of method of testing of utilizing the testing arrangement of the excavation face mud film value of holding one's breath when above-mentioned slurry shield is with pressure to open the cabin, first in testing column 1, pack drainage layer 2 into, then pack test stratum 3 into, behind saturated stratum, pack test mud 4 into, recycling flange 5 seals testing column 1 top; Open intake valve 6, set by adjusting air gauge 7 and air compressor machine 8 pressure that mud 4 permeates, air pressure is acted directly on the liquid level of mud 4, open draining valve 9, adopt the seepage discharge of beaker 10 and electronic scale 11 tests computation of mud 4; After permeability test certain time, close draining valve 9, observe thickness and the form of the mud film 12 of stratum 3 surface formation by the scale paper 13 on testing column 1; Open mud valve 14, after the mud in testing column 14 is all discharged, close mud valve 14; Adjust air compressor machine 8 and set atmospheric pressure value, then open draining valve 9, test and calculate the seepage discharge of mud film 12 under gas pressure.

The method of testing of the excavation face mud film value of holding one's breath when with pressure the opening the cabin of above-mentioned a kind of slurry shield, particularly comprises the following steps:

A. first in testing column 1, pack sand particle that 5cm is thick into as drainage layer 2, on it, pack by the method for controlling dry density the test stratum 3 that 20cm is thick into, stratum 3 is positioned on discharge outlet, then adopts from lower and carries out the saturated of stratum 3 from upper method; The method of controlling dry density is that those skilled in the art know and customary way, does not repeat here;

B. in testing column 1, on saturated stratum 3, pack the test mud 4 of about 20cm into, the top of the liquid level of mud 4 and testing column 1 has certain distance, the mud valve 14 at corresponding testing column 1 middle part, bottom of mud 4, adopt flange 5 by testing column 1 good seal, regulate air compressor machine 8 and air gauge 7, set the atmospheric pressure value that mud 4 permeates, then open after intake valve 6, make gas pressure on the liquid level of mud 4;

C. open the draining valve 9 of testing column 1 bottom, discharge the weight and volume of liquid by electronic scale 11 and beaker 10 tests, calculate the seepage discharge of mud 4, measure the thickness of mud film 12 by the scale paper 13 on testing column 1; The computational methods of seepage discharge are general knowledge known in this field, do not repeat here;

D. test is carried out after 4-8h, closes the draining valve 9 of testing column 1 bottom, then opens the mud valve 14 at testing column 1 middle part, the mud in testing column 14 is all discharged, as shown in Figure 2;

E. close mud valve 14 and intake valve 6, determine pressure rating and the action time of test mud film 12 values of holding one's breath, set after first order air pressure, open intake valve 14, air pressure is acted directly on mud film 12;

F. open draining valve 9, the seepage discharge (weight and volume of discharging liquid by electronic scale 11 and beaker 10 tests, calculates seepage discharge) under test first order gas pressure over time; If when seepage discharge temporal evolution amount is very little, after the variable quantity of flow to be infiltrated is stable, apply next stage air pressure, the seepage discharge under this grade of gas pressure of continuation test is over time;

If g. under certain one-level gas pressure, it is large that seepage discharge becomes suddenly, and gas penetrate mud film 12 subsequently, finishes test, and this corresponding stage pressure value is test mud 4 and forms the value of holding one's breath of mud film 12.

In step a, the single particle size gravel layer that the drainage layer 2 packing in testing column 1 is particle size range 2mm-5mm, stratum 3 is the stratum of present position in the actual engineering of opening the cabin; In step b, the mud of mud 4 for intending in the actual engineering of opening the cabin using.

In steps d, the time of permeability test should be set according to the mud film formation time in concrete engineering.

In step g, the value of holding one's breath of mud film 12 refers to the maximum gas pressure value that mud film can bear, and when described in air pressure is greater than when the value of holding one's breath, ventilative phenomenon will appear in mud integumentary pattern mud film; When described in air pressure is less than when the value of holding one's breath, the mud film state of holding one's breath in completely.

Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this. All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.

Claims (9)

1. the method for testing of excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin, is characterized in that: air compressor machine and air gauge that the testing arrangement utilizing comprises the testing column of tubulose, be connected with the top of described testing column, be arranged on intake valve between described testing column and air compressor machine, be positioned at described testing column bottom discharge outlet, be positioned at the mud discharging mouth at testing column middle part;
Described slurry shield is with pressure while opening the cabin, and the method for testing of the excavation face mud film value of holding one's breath comprises the following steps:
A. first in testing column, pack certain thickness sand particle into as drainage layer, on it, packing thickness into is the test stratum of 4 times of described drainage layer thicknesses, then adopts from lower and carries out the saturated of stratum from upper method;
B. in testing column, on saturated stratum, pack the roughly equal test mud of thickness and described formation thickness into, the liquid level of described mud and the top of testing column have certain distance, by testing column good seal, regulate air compressor machine and air gauge, set the atmospheric pressure value of mud infiltration, then open intake valve, make gas pressure on mud liquid level;
C. open the discharge outlet of testing column bottom, measure the volume and weight of discharging liquid the seepage discharge that calculates mud, measure the thickness of mud film;
D. test is carried out after certain hour, closes the discharge outlet of testing column bottom, then opens the mud discharging mouth at testing column middle part, and the mud in testing column is all discharged;
E. close mud discharging mouth and intake valve, determine pressure rating and the action time of the test mud film value of holding one's breath, set after first order air pressure, open intake valve, air pressure is acted directly on mud film;
F. open discharge outlet, the seepage discharge under test first order gas pressure over time; If when seepage discharge temporal evolution amount is very little, after the variable quantity of flow to be infiltrated is stable, apply next stage air pressure, the seepage discharge under this grade of gas pressure of continuation test is over time;
If g., under certain one-level gas pressure, seepage discharge suddenly change is large, gas penetrate mud film subsequently, finishes test, and the force value of this grade of corresponding air pressure is the value of holding one's breath of test mud formation mud film.
2. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: in step a, the drainage layer packing in described testing column is the single particle size gravel layer of particle size range 2mm-5mm.
3. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: in step a, in the time packing test stratum into, control dry density.
4. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: in step a, the stratum packing in described testing column is the stratum of present position in the actual engineering of opening the cabin; In step b, the mud packing in described testing column is the mud of intending use in the actual engineering of opening the cabin.
5. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: in step b, adopt flange that testing column is sealed.
6. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, it is characterized in that: described discharge outlet is to being connected to beaker, described beaker is placed on electronic scale, in step c and step f, measure the volume of discharging liquid by beaker, measure the weight of discharging liquid by electronic scale.
7. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: described stratum is positioned on discharge outlet the bottom of the described corresponding mud of mud discharging mouth.
8. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: described discharge outlet place is provided with the draining valve of controlling described outlet switch.
9. the method for testing of excavation face mud film value of holding one's breath that slurry shield according to claim 1 is with pressure while opening the cabin, is characterized in that: described mud discharging mouth place is provided with the mud valve of controlling described mud discharging mouth switch.
CN201410312273.XA 2014-07-02 2014-07-02 Testing arrangement and the method for excavation face mud film value of holding one's breath that slurry shield is with pressure while opening the cabin CN104121023B (en)

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CN104695969B (en) * 2015-02-28 2017-01-04 广东华隧建设股份有限公司 The method that shield machine is switched to soil pressure boring mode by muddy water boring mode
CN105738255A (en) * 2016-02-04 2016-07-06 上海隧道工程有限公司 Testing device and method for permeation of slurry in soil layer
CN105891084B (en) * 2016-04-06 2019-06-14 河海大学 Dismountable mud film forming and mud film tightness test device and method
CN105866337A (en) * 2016-04-21 2016-08-17 河海大学 Device and method for testing slurry shield excavation surface mud film formation and mud film air tightness under high pressure
CN108007827A (en) * 2017-12-29 2018-05-08 上海三瑞高分子材料股份有限公司 Slurry balance shield slurry penetration film forming experimental provision and method
CN108086987A (en) * 2018-01-11 2018-05-29 河海大学 EPB shield tunneling driving keeps the control method that excavation face is stablized in upper-soft lower-hard ground

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US4607889A (en) * 1984-11-29 1986-08-26 Daiho Construction Co., Ltd. Shield tunnel boring machine
CN100504030C (en) * 2004-04-02 2009-06-24 上海第二市政工程有限公司 PMS sludge preparation method and its application in construction of sludge balance shield and pipe-jacking
CN101191417A (en) * 2007-12-21 2008-06-04 沈阳重型机械集团有限责任公司 Bentonite mud water pressurization equilibration shield machine
CN102191939A (en) * 2010-03-05 2011-09-21 上海盾构设计试验研究中心有限公司 Test method for forming mud membrane by using slurry shield under high pressure

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Inventor after: Zhu Wei

Inventor after: Min Fanlu

Inventor after: Zhang Ning

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