CN106841578B - Slurry shield tunnel face slurry pressure experimental testing device and testing method - Google Patents
Slurry shield tunnel face slurry pressure experimental testing device and testing method Download PDFInfo
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- CN106841578B CN106841578B CN201710241296.XA CN201710241296A CN106841578B CN 106841578 B CN106841578 B CN 106841578B CN 201710241296 A CN201710241296 A CN 201710241296A CN 106841578 B CN106841578 B CN 106841578B
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- 239000002002 slurry Substances 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 236
- 239000002689 soil Substances 0.000 claims abstract description 72
- 239000011148 porous material Substances 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000013507 mapping Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000002474 experimental method Methods 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 19
- 238000010998 test method Methods 0.000 claims description 5
- 239000004568 cement Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 16
- 238000010276 construction Methods 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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Abstract
The invention discloses a slurry pressure experimental testing device for a slurry shield tunnel face, which comprises a soil box, a movable metal shell, a slurry bin, a buffer box, a slurry pump, a slurry pressure gauge, a pore water pressure storage and a slurry pressure storage, and also discloses a slurry pressure experimental testing method for the slurry shield tunnel face, wherein the mapping relation between the water pressure in the cement bin and the slurry pressure at the tunnel face can be obtained; the method has the advantages of convenient operation, low cost, strong reliability and the like, and has stronger popularization and use values.
Description
Technical Field
The invention belongs to the technical field of slurry pressure test of shield tunnels, and particularly relates to a slurry pressure test device for a slurry shield tunnel face, and a slurry pressure test method for the slurry shield tunnel face. The method is suitable for laboratory test of the slurry pressure chamber applied by the tunnel face of the slurry shield tunnel.
Background
In recent years, along with the rapid development of urban underground traffic tunnels and river-crossing and sea-crossing tunnels, shield tunneling machines are widely applied due to the advantages of good construction safety, high speed, small disturbance, high economic benefit and the like. The stability of the tunnel face has important influence on safe and efficient construction of the tunnel and effective control of earth surface subsidence in the shield tunnel construction process, and in slurry shield construction, the water and soil pressure of the tunnel face is balanced mainly by means of the applied slurry pressure, so that the stability of the tunnel face is guaranteed. In the construction process, the mud water pressure at the face cannot be directly monitored due to the construction complexity of the face, the mud water pressure applied to the face is judged and controlled mainly by the experience of operation technicians at present, the pressure in the mud water bin is simply considered to be identical to the mud water pressure distribution form and size at the face in the related research, and obviously, the method has unreasonable points. Because the disc is arranged between the face and the mud water bin at intervals and the disc is provided with an opening, the mud water pressure between the face and the mud water bin has certain relevance, and the mud water pressure in the mud water bin is easy to measure in construction, so that the mud water pressure value at the face can be obtained through inversion analysis by measuring the pressure value in the mud water bin, and further the face can be controlled effectively. The related documents such as a pressure control mechanism model and experimental study of a sealed cabin of a soil pressure balance shield in the prior art show that the soil pressure in the soil pressure cabin is associated with the soil pressure at the position of the tunnel face to a certain extent, however, the numerical simulation method cannot simulate the actual states of existence and distribution of the soil pressure in the tunnel face and the soil pressure cabin during shield tunneling, the conclusion is limited by numerical simulation analysis, the demonstration method needs to be carried out through the corresponding experimental method, and the soil body and the muddy water force transmission form are different to a certain extent. Therefore, the research on the experimental device capable of truly and effectively reflecting the occurrence state of the mud water flowing in the face and the mud water bin in the shield tunneling is particularly important, the mapping relation between the water pressure of the face and the mud water pressure of the mud water bin is determined through experiments, the water pressure at the face is predicted according to the monitoring result of the mud water pressure of the mud water bin, and the experimental device has important significance for stability control of the face.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a slurry pressure experimental testing device for a slurry shield tunnel face and a slurry pressure experimental testing method for the slurry shield tunnel face. The mud water pressure values of the corresponding positions in the tunnel face and the mud water bin are tested by setting different experimental conditions, the mapping function relation between the mud water pressure of the tunnel face and the mud water pressure value of the mud water bin is obtained by correlation analysis, the mud water pressure value at the tunnel face can be predicted better by monitoring the mud water pressure value of the mud water bin, powerful theoretical support is provided for dynamic control of the supporting pressure of the tunnel face, and safe and efficient construction is guaranteed.
The utility model provides a slurry shield face muddy water pressure experiment testing arrangement, including the soil box, but still include movable metal casing, soil box intercommunicating pore has been seted up to the lateral wall of soil box, the shell intercommunicating pore has been seted up to the lateral wall of movable metal casing, cylindric muddy water storehouse passes through the horizontal level of brace table and sets up in movable metal casing, muddy water storehouse one end is provided with opening control piece and wears out shell intercommunicating pore and soil box intercommunicating pore seamless connection, muddy water storehouse other end is sealed, muddy water storehouse top is connected with the buffer tank through muddy water advance pipe, muddy water storehouse bottom is connected with the muddy water pump through muddy water exit tube, muddy water pump passes through muddy water connecting pipe and is connected with the buffer tank, the inner wall of soil box is located the partial cover of soil box intercommunicating pore that is equipped with the reinforcing bar net from top to bottom on the reinforcing bar net be provided with a plurality of and muddy water pressure gauge one-to-one height correspondence, the muddy water pressure gauge is connected with pore water pressure memory, muddy water pressure gauge is provided with the valve on the muddy water advance pipe.
The opening control piece comprises a connecting shaft, a first baffle and a second baffle, wherein the first baffle and the second baffle are respectively provided with a circulation port, the first baffle and the second baffle are respectively sleeved on the connecting shaft and can be circumferentially rotated by the connecting shaft, and the first baffle and the second baffle are attached to each other.
The soil box and the movable metal shell are connected through a flange.
A slurry shield tunnel face slurry pressure experimental test method comprises the following steps:
step 4, adding mud-water slurry required by experiments into the buffer tank until the mud-water slurry surface in the buffer tank reaches a set position and remains stable and unchanged;
and 6, closing the mud water pump and the valve, and fitting the pore water pressure data and the mud water pressure data measured by the mud water pressure gauge and the pore water pressure gauge corresponding to the height position obtained in the step 5 to obtain a mapping relation function of the pore water pressure and the mud water pressure in the mud water bin under the condition of the opening ratio set by experiments: p (P) m =A×P n -B, wherein P n Is the pressure variable, P, of the muddy water in the muddy water bin 12 under the current aperture ratio condition m For pore water pressure variable under the current aperture ratio condition, A and B are constant coefficients of a mapping relation function under the aperture ratio condition set by experiments;
Compared with the prior art, the invention has the following advantages:
the simulated cement slurry flowing state is closer to the actual situation, so that the data obtained by monitoring the water pressure in the cement bin and the mud water pressure at the face are more real and effective, the mapping relation between the water pressure in the cement bin and the mud water pressure at the face can be obtained by fitting and analyzing two groups of data obtained by monitoring, and the size of a gap on the fixed baffle can be changed by arranging the opening control piece on the fixed baffle in the device, so that the influence of the cutter head opening ratio on the mud water pressure of the face and the mud water pressure of the mud water bin can be studied, and a powerful theoretical basis can be provided for dynamically regulating the mud water pressure in the mud water bin and guaranteeing the stability of the face; in addition, the invention has the advantages of convenient operation, low cost, strong reliability and the like, and has stronger popularization and use values.
Drawings
FIG. 1 is a schematic diagram of a slurry pressure test device for a slurry shield tunnel face;
FIG. 2 is a schematic plan view of a stationary barrier;
FIG. 3 is a schematic plan view of a fixed baffle after changing the aperture ratio;
FIG. 4 is a schematic diagram of the fitting relationship between the mud water pressure of the mud water bin and the water pressure of the face aperture.
In the figure: 1-pore water pressure storage, 2-muddy water pressure storage, 3-buffer tank, 401-muddy water inlet pipe, 402-muddy water outlet pipe, 403-muddy water connecting pipe, 5-muddy water pump, 6-opening control piece, 7-soil box, 8-reinforcing mesh, 9-pore water pressure gauge, 10-opening control piece, 11-supporting table, 12-muddy water bin, 13-muddy water pressure gauge, 14-movable metal shell, 15-valve, 16-soil box communication hole and 17-shell communication hole.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:
example 1
As shown in fig. 1, a slurry shield tunnel face muddy water pressure experiment testing device comprises a soil box 7, further comprising a movable metal shell 14, soil box communication hole 16 is formed in the side wall of the soil box 7, shell communication hole 17 is formed in the side wall of the movable metal shell 14, cylindrical muddy water bin 12 is horizontally arranged in the movable metal shell 14 through a supporting table 11, an opening control piece 10 is arranged at one end of the muddy water bin 12 and penetrates through the shell communication hole 17 to be in seamless connection with the soil box communication hole 16, the other end of the muddy water bin 12 is sealed, the top of the muddy water bin 12 is connected with a buffer box 3 through a muddy water inlet pipe 401, the bottom of the muddy water bin 12 is connected with a muddy water pump 5 through a muddy water outlet pipe 402, the muddy water pump 5 is connected with the buffer box 3 through a muddy water connecting pipe 403, a plurality of muddy water pressure gauges 13 are vertically arranged on the path of muddy water in the muddy water bin 12 from top to bottom, a part of the inner wall of the soil box 7 is covered with a reinforcing steel bar net 8, a plurality of pore water pressure gauges 9 corresponding to the height of the muddy water pressure gauges 13 are arranged on the reinforcing bar net 8 from top to bottom, the pore pressure gauges 9 are connected with the muddy water pressure gauges 1 and the muddy water pressure gauges 13, and the muddy water pressure sensors 401 are connected with the muddy water pressure sensors 15.
The opening control member 10 comprises a connecting shaft, a first baffle and a second baffle, wherein the first baffle and the second baffle are respectively provided with a circulation port, the first baffle and the second baffle are respectively sleeved on the connecting shaft and can be circumferentially rotated by the connecting shaft, and the first baffle and the second baffle are attached to each other.
The soil box 7 is connected with the movable metal shell 14 through a flange.
The top plate of the soil box 7 can be detached, and the pore water pressure storage device 1 is placed on the top plate of the soil box 7.
The axis of the mud sump 12, the axis of the soil box communication hole 16, and the axis of the housing communication hole 17 are collinear.
Example 2:
a slurry pressure test method for a slurry shield tunnel face by using the slurry pressure test device for a slurry shield tunnel face according to embodiment 1 comprises the following steps
step 4, adding mud-water slurry required by experiments into the buffer tank 3 until the mud-water slurry surface in the buffer tank 3 reaches a set position and keeps stable and unchanged;
and 6, closing the mud water pump 5 and the valve 15, and fitting the pore water pressure data and the mud water pressure data measured by the mud water pressure gauge 13 and the pore water pressure gauge 9 which are corresponding to the height positions obtained in the step 5 to obtain a mapping relation function of pore water pressure (face mud water pressure) and mud water pressure in the mud water bin 12 under the condition of the opening ratio set by experiments: p (P) m =A×P n -B, wherein P n Is the pressure variable, P, of the muddy water in the muddy water bin 12 under the current aperture ratio condition m For the pore water pressure variable (tunnel face mud water pressure variable) under the current aperture ratio condition, A and B are constant coefficients of a mapping relation function fitted under the aperture ratio condition set by experiments;
Example 3:
the slurry pressure test method of the slurry shield tunnel face by using the slurry pressure test device of the slurry shield tunnel face disclosed in the embodiment 1 by taking the sandy soil stratum disclosed in the tunnel construction process as an experimental soil sample comprises the following steps of
step 4, adding slurry required by experiments into the buffer tank 3, wherein the slurry is cement slurry with a water-cement ratio of 1:1 until the slurry surface in the buffer tank 3 reaches 1/3 of the height of the buffer tank 3 and keeps stable;
And 6, closing the mud water pump 5 and the valve 15, and fitting the pore water pressure data and the mud water pressure data measured by the mud water pressure gauge 13 and the pore water pressure gauge 9 which are corresponding to the height position obtained in the step 5 to obtain a mapping relation function of pore water pressure (face mud water pressure) and mud water pressure in the mud water bin 12 under the condition of the opening ratio set by experiments: p (P) m =A×P n -B, wherein A is 1.225 and B is 0.1279, wherein P n Is the pressure variable, P, of the muddy water in the muddy water bin 12 under the current aperture ratio condition m For the pore water pressure variable (tunnel face mud water pressure variable) under the current aperture ratio condition, A and B are constant coefficients of a mapping relation function under the aperture ratio condition set by experiments;
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (1)
1. A slurry shield working face slurry pressure experiment test method utilizes a slurry shield working face slurry pressure experiment test device, the device comprises a soil box (7), further comprises a movable metal shell (14), soil box communication holes (16) are formed in the side wall of the soil box (7), shell communication holes (17) are formed in the side wall of the movable metal shell (14), a cylindrical slurry bin (12) is horizontally arranged in the movable metal shell (14) through a supporting table (11), an opening control piece (10) is arranged at one end of the slurry bin (12) and penetrates through the shell communication holes (17) to be in seamless connection with the soil box communication holes (16), the other end of the slurry bin (12) is sealed, the top of the slurry bin (12) is connected with a buffer box (3) through a slurry inlet pipe (401), the bottom of the slurry bin (12) is connected with a slurry pump (5) through a slurry outlet pipe (402), a plurality of slurry pressure gauges (13) are vertically arranged in the path through which the supporting table (11), a plurality of slurry pressure gauges (13) are arranged in the path through which the slurry pump (5) are arranged from top to bottom, the inner wall of the slurry bin (12) is provided with a plurality of water gauges (8) corresponding to the water pressure gauges (8) on the water meter (8), the pore water pressure gauge (9) is connected with the pore water pressure storage (1), the muddy water pressure gauge (13) is connected with the muddy water pressure storage (2), the muddy water inlet pipe (401) is provided with a valve (15),
the opening control piece (10) comprises a connecting shaft, a first baffle and a second baffle, wherein the first baffle and the second baffle are respectively provided with a circulation port, the first baffle and the second baffle are respectively sleeved on the connecting shaft and can be rotated circumferentially by taking the connecting shaft as the center, the first baffle and the second baffle are attached,
the soil box (7) is connected with the movable metal shell (14) through a flange,
the method is characterized by comprising the following steps of:
step 1, separating a soil box (7) from a movable metal shell (14), and controlling the opening ratio of an opening of a mud water bin (12) communicated with a soil box communication hole (16) to be an experimental set opening ratio through an opening control piece (10);
step 2, the soil box (7) and the movable metal shell (14) are installed together, and the soil box communication hole (16) is communicated with the muddy water bin (12);
step 3, taking down the top plates of the pore water pressure storage device (1) and the soil box (7), filling soil used in the experiment into the soil box (7), tamping and compacting the soil to meet the experiment requirement, installing the top plate of the soil box (7), and placing the pore water pressure storage device (1) on the top plate of the soil box (7);
step 4, adding slurry required by experiments into the buffer tank (3) until the slurry surface in the buffer tank (3) reaches a set position and keeps stable;
step 5, opening a mud water pump (5), setting the flow of the mud water pump (5), opening a valve (15), opening a pore water pressure storage (1) and a mud water pressure storage (2) when the flow of mud water slurry is stable, and reading and recording pore water pressure data and mud water pressure data;
and 6, closing the mud water pump (5) and the valve (15), and fitting the pore water pressure data and the mud water pressure data measured by the mud water pressure gauge (13) and the pore water pressure gauge (9) which are obtained in the step 5, so as to obtain a mapping relation function of the pore water pressure and the mud water pressure in the mud water bin (12) under the condition of the opening ratio set by experiments: p (P) m =A×P n -B, wherein P n Is the pressure variable of the muddy water in the muddy water bin (12) under the current aperture ratio condition, P m For pore water pressure variable under the current aperture ratio condition, A and B are constant coefficients of a mapping relation function under the aperture ratio condition set by experiments;
step 7, opening a mud water pump (5) to drain mud water in a mud water bin (12), adjusting the opening ratio to the opening ratio set in the next experiment, repeating the steps 1-6, and testing the mapping relation function of pore water pressure and mud water pressure in the mud water bin (12) under the condition of different opening ratios: p (P) m =A×P n -B；
Step 8, fitting the different aperture ratios with A under the corresponding aperture ratio conditions to obtain a function A' taking the aperture ratio as an independent variable, which will not be the caseFitting with the aperture ratio and B under the condition of the corresponding aperture ratio to obtain a function B' taking the aperture ratio as an independent variable, and obtaining a mathematical expression of pore water pressure and mud water pressure in the mud water bin (12) under the influence of the related aperture ratio
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| CN107991042B (en) * | 2017-12-04 | 2019-08-02 | 济南大学 | A kind of recyclable pin-connected panel floor hydrostatic loading device and its application method |
| CN114136677B (en) * | 2021-11-26 | 2023-09-08 | 中铁隧道局集团有限公司 | Comprehensive monitoring experiment platform of slurry shield equipment |
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| JPH0194197A (en) * | 1987-10-06 | 1989-04-12 | Toda Constr Co Ltd | Facing hydraulic holder in mud pressure type shield |
| JP2882481B1 (en) * | 1998-04-28 | 1999-04-12 | 株式会社銭高組 | Mud / mud pressure shield excavation combined use formation gas detection method and detection device |
| 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 |
| JP5425855B2 (en) * | 2011-10-12 | 2014-02-26 | 株式会社アクティオ | Muddy water type shield machine |
| CN103437771B (en) * | 2013-07-29 | 2015-06-03 | 同济大学 | Indoor model test device capable of simulating slurry balance shield construction and use method thereof |
| CN104990659B (en) * | 2015-06-19 | 2017-06-13 | 同济大学 | A kind of swelled ground area slurry balance shield tunnel tunnel face expansive force experimental rig |
| CN105863624B (en) * | 2016-04-12 | 2018-12-28 | 河海大学 | The visual test method that simulation slurry shield slurry permeates in the earth formation |
| CN205593991U (en) * | 2016-04-21 | 2016-09-21 | 河海大学 | High pressure is slurry shield excavation face mud film forming and sludge -biofilm air tightness testing device down |
| CN206832805U (en) * | 2017-04-13 | 2018-01-02 | 中国科学院武汉岩土力学研究所 | A kind of slurry shield face mud hydraulic pressure experiment test device |
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