CN114235644A - Resistance measuring device, testing device and testing method for slurry permeation column - Google Patents
Resistance measuring device, testing device and testing method for slurry permeation column Download PDFInfo
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- 239000002002 slurry Substances 0.000 title claims abstract description 114
- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 239000002689 soil Substances 0.000 claims abstract description 58
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 230000035515 penetration Effects 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 230000008595 infiltration Effects 0.000 claims description 40
- 238000001764 infiltration Methods 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 229910001868 water Inorganic materials 0.000 claims description 33
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- 239000011148 porous material Substances 0.000 claims description 23
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 9
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- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005325 percolation Methods 0.000 claims description 2
- 238000013480 data collection Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 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
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- General Health & Medical Sciences (AREA)
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a resistance measuring device, a testing device and a testing method for a slurry penetration column, wherein the resistance measuring device for the slurry penetration column comprises a penetration column with a cavity and a resistance measuring mechanism, a plurality of electrode rings are arranged on the penetration column in a sleeving manner, a soil body is arranged in the electrode rings during a simulation test, according to the principle that the content of slurry in the soil body is different and the resistance of the soil body is also different, voltage is applied to the two electrode rings during the slurry penetration process to measure the change of the resistance of the soil body between the two electrode rings, and a change curve of the resistance of the soil body during the slurry penetration process can be obtained after a measurement data collection computer control end is fitted, so that the penetration degree of subsequent slurry is deduced, and the real-time monitoring of the penetration degree of the slurry is facilitated.
Description
Technical Field
The invention relates to the technical field of slurry penetration measuring devices, in particular to a slurry penetration column resistance measuring device, which comprises a slurry penetration column resistance measuring device and a slurry penetration test device for simulating a slurry shield excavation surface and a method for simulating a slurry penetration test of the slurry shield excavation surface.
Background
With the continuous progress and development of tunnel construction technology, the shield method is widely applied to the construction of various tunnel projects by virtue of the advantages of high excavation speed, high mechanization degree, small disturbance to the surrounding environment, wide application range and the like. Particularly, the slurry balance shield can be widely applied to the construction process of the cross-river and sea-crossing tunnel. The mud-water balance shield is characterized in that the mud with pressure is adopted to maintain the stability of the excavation surface, and the residue soil is transported out through mud circulation, and the accurate setting of the mud pressure is a difficult problem in construction. When the mud water pressure is too low, collapse and damage of an excavation surface (active instability) can be caused; the mud water pressure is too large, so that the excavation surface is split (passively unstable), and the river water flows backward if the crack penetrates to the bottom of the river. Therefore, the research and development of the test device for researching the permeation and film forming rule of the slurry in the stratum has great significance for the reasonable control research of the slurry pressure of the excavation face.
At present, more tests and researches are carried out on slurry permeation and film formation of the slurry shield excavation surface. However, the existing domestic and foreign related test devices basically install pore pressure gauges on the side walls of the permeation columns to indirectly observe the permeation conditions of the slurry in the soil (the change of the pore water pressure in the soil caused by the permeation of the slurry), and the method cannot monitor the deposition and migration conditions of slurry particles in the soil, is limited by the test frequency of the pore water pressure gauges, and cannot realize real-time observation. The specific relevant test device comprises:
lifeng et al "a dynamic mud permeability test device and method" (patent application No. CN2020108158697), the device includes: an infiltration system, a cutting system, and a pressurization system. The infiltration system comprises a soil sample cylinder, a slurry cylinder A, a slurry cylinder B and a water storage tank, and is used for performing slurry infiltration and measuring the pore pressure and the water infiltration amount in the test process in real time; the cutting system comprises a power unit, a transmission shaft and a cutter head and is used for driving the cutter head to rotate and advance so as to cut a soil sample; the pressurization system comprises an air storage tank and a pressure controller and is used for controlling the mud pressure of the soil sample cylinder. The device can be used for carrying out a mud dynamic permeation simulation test under the condition that the cutter head continuously cuts the soil body of the excavation surface in the shield tunneling process, and measuring the dynamic change process of the pore water pressure and the stratum water seepage quantity of the soil body.
Kojileyi et al, "a horizontal simulation stratigraphic layer mud infiltration and soil body mechanical properties change testing arrangement" (patent application number CN2019109918187), this device can horizontal simulation stratigraphic layer mud infiltration membrane, and it includes: the device comprises a transparent test barrel, a pressurizing mechanism, a soil body measuring mechanism, a scanning electron microscope and a supporting mechanism. The method is mainly characterized in that the slurry permeation column is horizontally arranged, and the horizontal permeation of slurry on the excavation surface of the slurry shield on the construction site is simulated. However, for the observation of the mud deposition inside the soil body, only the soil sample can be obtained before and after the test, and then the observation is carried out by using a scanning electron microscope, so that the real-time observation cannot be realized.
The patent application No. CN2019112939013 discloses a dynamic penetration and film formation test device and a measurement method for slurry balance shield slurry, wherein an upper cover plate is arranged at the top of a penetration cylinder of the test device, a lower cover plate is arranged at the bottom of the penetration cylinder, an air inlet valve of the upper cover plate is connected with an air compressor through a pressure conveying pipe and used for providing air pressure for the penetration cylinder, and a slurry inlet valve is used for adding slurry into the penetration cylinder; the cutter head is connected to the motor through a cutter head connecting rod penetrating through a reserved hole in the top; a bottom preformed hole and a water outlet valve are arranged on the lower cover plate, a permeation base plate supporting rod arranged at the bottom of the permeation base plate penetrates through the bottom preformed hole and abuts against the force application end of a jack positioned below the lower cover plate, the water outlet valve is connected with a measuring cylinder through a hose, and an electronic scale is arranged below the measuring cylinder; in the test, the slurry seepage filtration loss is collected and measured in the process of graded pressurization, and the forming process and the seepage distance of a slurry film are observed and recorded.
"a simulation slurry shield mud permeates the variable cross section test device and method of filming" (patent application No. CN2021103506072) of Tantao et al, the main characteristic of the test device lies in the experimental cylinder, the experimental cylinder includes upper cylinder and lower cylinder connected, the diameter of the lower cylinder is greater than the diameter of the upper cylinder; a muddy water bin is arranged at the lower part in the upper barrel, and a stratum filling bin and a pebble filtering layer are sequentially arranged in the lower barrel from top to bottom; the lateral walls of the lower part of the upper barrel and the upper part of the lower barrel are provided with pressure gauges, the lateral wall of the bottom of the lower barrel is connected with a measuring cylinder, the bottom of the measuring cylinder is matched with a measuring scale, and the pressure gauges and the measuring scale are both connected with an upper computer. The test device can simulate and probe the migration rule of slurry particles in the three-dimensional space in front of the excavation surface of the slurry shield. However, the test apparatus also fails to provide real-time observation of the amount of particles that migrate and deposit during the infiltration process of the slurry.
Disclosure of Invention
In order to solve at least one technical defect, the invention provides the following technical scheme:
the application document discloses a mud infiltration post resistance measurement device, including infiltration post, the resistance measurement mechanism who includes the cavity, resistance measurement mechanism includes electrode subassembly, resistance monitoring system, the infiltration post is connected with the electrode subassembly registrate, electrode subassembly includes that a plurality of electrode circles and a plurality of electrode circle are in interval distribution on the infiltration post length extending direction, resistance monitoring system is connected with the electrode circle in order to monitor the resistance between the two electrode circles.
According to the scheme, the electrode rings are installed on the permeation column in a sleeving mode, during simulation test, soil is in the rings of the electrode rings, voltage is applied to the two electrode rings in the slurry permeation process according to the principle that the content of slurry in the soil is different and the resistance of the soil is also different, the change of the resistance of the soil between the two electrode rings is measured, and the change curve of the resistance of the soil in the slurry permeation process can be obtained after the measurement data is fitted by the computer control end, so that the permeation degree of subsequent slurry is deduced, and the real-time monitoring of the permeation degree of the slurry is facilitated.
Furthermore, each electrode ring is concentrically fixed with the permeation column, and the electrode rings are fixed on the wall of the permeation column.
For the electrode ring, the electrode wire is conventionally surrounded into a ring shape, such as a copper electrode wire, the line width of the electrode wire is above 0.1mm, and can be adapted to change according to different sizes of the penetrating column or the measurement condition, and for the conventional penetrating column simulating slurry penetration, the line width of the electrode ring is preferably 0.2-0.8mm, such as 0.3mm, the diameter of the electrode ring is consistent with the inner diameter of the penetrating column, and a groove can be formed on the inner wall of the cavity of the penetrating column to fix the electrode ring.
Furthermore, the resistance monitoring system is of a single-arm Wheatstone bridge type, is simple and practical, and is convenient and rapid to measure.
The application document discloses simulation slurry shield excavation face mud infiltration test device, including foretell mud infiltration post resistance measurement device and control system, cutting system, mud conveying system, the cutting system includes shift mechanism, driving motor and cutter mechanism, shift mechanism's removal end is connected with driving motor, driving motor's output and cutter mechanism are connected, cutter mechanism is located infiltration post one end, control system is connected with driving motor, shift mechanism and mud conveying system, mud conveying system and infiltration column junction, its characterized in that, resistance monitoring system with control system connects with the on-time and the on-interval of receiving resistance monitoring system measured data and adjusting resistance monitoring system.
In the scheme, the integrated control system, the cutting system, the slurry conveying system and the slurry permeation column resistance measuring device are integrated to simulate a slurry permeation test, and in the slurry permeation process, the resistance monitoring system is used for monitoring the resistance change of a soil body in a permeation column in real time, the control system is used for collecting data and fitting a curve, the slurry permeation degree is deduced according to the curve, and the slurry permeation is controlled in real time.
Further, cutter mechanism includes blade holder, blade one, blade two, blade one is the cross and distributes and blade two sets up this cross center on the blade holder, the length of blade two is greater than the length of blade one improves the cutter structure, and two lengths of blade at center are greater than the length of blade one, wholly are the toper, and the cutting effect is good, simulates the excavation face mud infiltration under the shield structure cutter cutting action better.
Further, the blade holder is the cross, blade one distributes along the cross armed lever of blade holder, blade two sets up the center of blade holder, blade one is trapezoidal and the top surface is fixed with the blade holder, the upper portion of blade two is the rectangle form and fixes with upper portion and blade holder, and the lower part of blade two is three horn shapes, and cutting effect is good.
Furthermore, the shifting mechanism is arranged on one side of the penetrating column, the slurry conveying system comprises a pressure pump, a pressure stabilizing valve and a slurry storage tank, the pressure stabilizing valve is arranged on a connecting pipeline between the outlet end of the pressure pump and the slurry storage tank, and the slurry storage tank is connected with the penetrating column. Preferably, the displacement mechanism is of a telescopic cylinder type or a screw-nut pair type.
Further, still include pore pressure meter, constant pressure bottle, water catch bowl, pore pressure meter and electrode circle all set up on the upper portion of infiltration post, and constant pressure bottle lower part water inlet is connected with the infiltration delivery port of infiltration post, and the upper portion delivery port and the water catch bowl of constant pressure bottle are connected, increase pore pressure and take turns to the ponding bucket, monitor the pore pressure change through the pore pressure meter to the liquid that the infiltration was filtered out is collected to the water catch bowl, takes turns to the change of infiltration flow through the pore pressure, and the mud infiltration degree is known more comprehensively to the change of cooperation resistance.
The application document discloses a method for simulating a slurry penetration test of a slurry shield excavation surface, wherein a plurality of electrode rings are distributed at intervals in a cavity of a penetration column along the length extension direction of the penetration column, a resistance monitoring system is used for monitoring the resistance change of a soil body between the two electrode rings in the soil body penetration process of slurry in the rings of the electrode rings, a control system is used for acquiring data measured by the resistance monitoring system and fitting a resistance change curve of the soil body in the slurry penetration process, and the calculation formula of the resistance is
Rho is the resistivity of the soil body; u is a fixed applied voltage; a is the detected current value; r is the radius of the upper cylindrical barrel; l is the thickness of the soil layer.
In the mud infiltration process, the electrode rings are matched with the resistance monitoring system and the calculation formula to monitor the resistance change of the soil body in real time, the control system collects resistance change data to fit an influence curve of the mud content on the resistance of the soil body, the subsequent mud infiltration condition can be conjectured according to the resistance change, the mud infiltration degree is conjectured through the resistance change, and the mud infiltration situation is more intuitive and convenient to control in real time.
Further, the relation curve between the mud content and the soil body resistance accords with the following formula: ρ ═ ac－bRho is the resistance, and c is the mud content in the soil. Such as in one embodiment the formula p 97.70c-0.2497.70(a) and-0.24 (b) are only values of specific soil and mud, calibration tests are carried out according to different soil and mud requirements before each experiment, and the calibration process refers to a method recorded in a journal entitled 'test research on resistivity characteristics of soil at a shield excavation surface penetration zone' previously published in civil engineering newspaper 11/15 of 2020 by the inventor.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, a resistance measurement structure of the permeation column is developed according to the principle that slurry permeation influences the resistance of a soil body, the resistance change is monitored in real time by matching a resistance measurement system in an electrode ring mode, and the subsequent slurry permeation degree is directly presumed by fitting an influence curve of slurry content on the resistance of the soil body, so that the slurry permeation degree is conveniently controlled in real time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the mud permeating column resistance measuring device;
FIG. 2 is a schematic structural diagram of a mud penetration test device for simulating a mud shield excavation surface;
FIG. 3 is a schematic view of the engagement of the shifting mechanism with the cutter mechanism;
FIG. 4 is a schematic bottom view of the knife mechanism;
FIG. 5 is a perspective view of the cutter mechanism;
FIG. 6 is a schematic diagram of the distribution structure of the electrode rings;
FIG. 7 is a mud particle distribution plot;
FIG. 8 is a graph showing the resistivity distribution of soil and the change of the permeation time thereof;
FIG. 9 is a graph showing the distribution of mud content in the soil and the change of the permeation time thereof;
wherein the reference numerals are:
1. a permeation column; 2. a pore pressure meter; 3. a cutter mechanism; 4. a sample formation; 5. a filtering layer; 6. a pulp inlet; 7. air holes are formed; 8. a leachate outlet; 9. an electrode ring; 10. a resistance monitoring system; 11. a control system; 12. a drive motor; 13. a displacement mechanism; 14. a slurry storage tank; 15. a pressure maintaining valve; 16. a pressure pump; 17. a mahalanobis constant pressure bottle; 18. a water collection barrel; 30. a tool apron; 31. a first blade; 32. and a second blade.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1
As shown in fig. 2, the mud penetration test device for simulating the slurry shield excavation surface comprises a mud penetration column resistance measuring device, a control system 11, a cutting system and a mud conveying system. The mud permeation column resistance measuring device is shown in figure 1 and comprises a permeation column 1 with a cavity inside and a resistance measuring mechanism, wherein the resistance measuring mechanism comprises an electrode assembly and a resistance monitoring system 10, the permeation column 1 adopts a common barrel-shaped configuration, the permeation column 1 is sleeved with the electrode assembly, and the electrode assembly is formed by a plurality of electrode rings 9. As shown in fig. 1, a plurality of electrode rings 9 are axially installed at intervals in the upper area of the barrel cavity, as shown in fig. 6, 14 electrode rings are installed in the present embodiment, an electrode wire with a line width of 0.3mm is used for enclosing the electrode rings to form the electrode rings 9, two adjacent electrode rings of the first 7 electrode rings are axially fixed at intervals of 5mm, the middle 4 electrode rings are fixed at intervals of 10mm, and the last 3 electrode rings are fixed at intervals of 40 mm. In the embodiment, a groove is formed in the inner wall of the barrel cavity of the permeation column 1 along the circumferential direction, an electrode ring is placed in the groove, an electrode ring connector is welded on the permeation column in an electric welding mode and is in butt joint with the resistance monitoring system 10 through a resistivity testing wire, the diameter of the electrode ring is consistent with the inner diameter of the barrel cavity, and the electrode ring and the barrel cavity are fixed in a concentric mode. The resistance monitoring system 10 adopts a wheatstone single-arm bridge, a plurality of bridge circuit resistance gears are configured, a resistance measuring mechanism is connected with each electrode ring, and the resistance measuring mechanism applies voltage to the two electrode rings to further calculate the resistance.
In the embodiment, a slurry storage tank 14 is fixed on one side of a permeation column 1, a pipeline is fixed at an outlet end of a pressure pump 16, a pipeline outlet is positioned in a cavity of the slurry storage tank, a pressure stabilizing valve 15 is installed on the pipeline, an outlet end of the bottom of the slurry storage tank 14 is connected with a slurry inlet 6 on a top cover plate of the permeation column 1 through a pipeline to inject slurry, and a vent hole 7 is formed in the top cover plate to facilitate gas outlet. The cutting system comprises a shifting mechanism 13, a driving motor 12 and a cutter mechanism 3, as shown in fig. 1 and fig. 3, the shifting mechanism 13 is fixed on a frame body on one side of the permeation column 1, the shifting mechanism 13 adopts a screw-nut pair shifting mechanism, the driving motor 12 is fixed at the moving end of the shifting mechanism, the output end of the driving motor 12 is connected with the cutter mechanism 3, and the driving motor 12 and the cutter mechanism 3 are both positioned at the top end of the permeation column 1. A control system 11 is composed of a computer and a control box, the control system 11 is connected with a driving motor 12, a shifting mechanism 13, a slurry conveying system and a resistance measuring system, the slurry conveying system is used for conveying slurry to the permeation column in a pressurizing mode, the control system is used for controlling the cutting speed, the shifting speed, the pressure, the electrifying time and the electrifying interval of the electrode ring in real time, and collecting test data of a pore water pressure gauge and measurement data of the resistance measuring system and fitting a resistivity change curve. In this embodiment, a pore pressure meter 2, a ma's constant pressure bottle 17 and a water collecting tank 18 may be further added, a water inlet at the bottom of the constant pressure bottle 17 is communicated with a leachate outlet 8 at the bottom of the permeation column 1, a water outlet at the top of the constant pressure bottle 17 is connected with the water collecting tank 18, the permeate is weighed by a weighing mechanism such as an electronic scale, and the pore pressure is measured by the pore pressure meter, so that the permeation of slurry is conveniently estimated, for example, in the case of the application No. 2021103506072, the patent name: the application document of the variable cross-section test device and the variable cross-section test method for simulating slurry penetration and film formation of the slurry shield is recorded.
In this embodiment, the cutter mechanism 3 includes a cutter holder 30, a first blade 31, and a second blade 32, as shown in fig. 4 and 5, the cutter holder 30 is cross-shaped, the first fixed blades 31 are distributed on a cross-shaped arm, the first blades 31 are distributed in cross-shape, and the second blade 32 is fixed in the center of the cross-shape. The number of the second blades 32 is 1, as shown in the lower right of fig. 4, the upper portions of the second blades are rectangular and fixed with the tool apron, the lower portions of the second blades are isosceles triangle-shaped, the thicknesses of the first blades and the second blades are both 10mm, the length of the second blades is greater than that of the first blades, in the embodiment, the tips of the second blades 32 are 5mm higher than those of the first blades 31, and the whole cutter mechanism is conical. The center of the top surface of the tool apron is formed with a cylindrical fixed seat so as to be convenient to be butted and fixed with the moving end of the shifting mechanism.
In the following, a simulation test is performed by the above-mentioned slurry shield excavation surface slurry penetration test device, in this embodiment, a static simulation test is performed, as shown in fig. 1 and 2, the pore pressure gauge 2 and the electrode ring 9 are both located in an upper region of the penetration column 1, and the pore pressure gauge 2 is fixed on the side wall at intervals along the axial direction of the penetration column 1.
Preparation of a filter layer 5: before preparing a test stratum, firstly preparing a uniform filter layer with the height of 6cm at the bottom of a test device, selecting coarse sand with the particle size range of 3-5 mm as a preparation material of the filter layer, and controlling the dry density to be 1.5g/cm3。
Preparation of sample formation 4 and mud: according to the porosity of a test stratum to be controlled, the stratum material adopts Chinese ISO standard sand, three types of sandy soil with the particle size ranges of 1.00-2.00 mm, 0.50-1.00 mm and 0.075-0.50 mm are obtained by screening the standard sand, the three types of sandy soil are combined according to the proportion of 1:1:1 to prepare the stratum material for the test, the specific stratum material combination and basic properties are shown in table 1, the stratum material is uniformly mixed and poured into a permeation column, and the stratum material is prepared by adopting a layered hammering method.
TABLE 1 basic physical Properties of the formation
The slurry material mainly comprises bentonite, water and sodium carboxymethyl cellulose (CMC) solution. The slurry is prepared from bentonite 70g, tap water 1L and CMC 0.3%, the particle size distribution of the slurry is shown in figure 7, CMC solution is prepared by water bath method, the temperature of the solution is controlled at about 50 ℃ in the preparation process, the CMC solution is mixed with the rest components of the bentonite slurry before the test, and the mixture is stirred uniformly and stored in a slurry storage tank for later use.
Saturation of the sample: and (3) saturating the stratum of the sample from top to bottom, and when the liquid level is flush with the surface of the sandy soil sample, considering that the sample is completely saturated, wherein the saturation time is about 24 hours.
Fill mud and seal test device: before the test is started, the prepared slurry is slowly filled into the permeation column from the slurry tank until the position of the upper cover plate of the permeation column is reached, the height of the slurry is 12cm, and then the upper cover plate of the permeation column is covered and the device is sealed.
Setting parameters: the method comprises the following steps of setting pressure control and data acquisition for a control system, opening an air inlet pipeline pressure stabilizing valve of a pressure pump, setting air source output air pressure to be 50kPa, setting infiltration water acquisition time interval to be 0.5s, setting data acquisition interval of a pore pressure meter to be 0.2s, recording initial pore pressure data, adjusting a resistivity test gear in a resistance monitoring system to be 1k omega, electrifying once every 0.2s, and simultaneously acquiring data once every 0.2s by the control system, wherein a resistance calculation formula is as follows:
rho is the resistivity of the soil body; u is a fixed applied voltage; a is the detected current value; r is the radius of the upper cylindrical barrel; l is the thickness of the soil layer.
Starting slurry penetration: and opening a water outlet drain pipe valve at the bottom of the permeation column, closing the percolation water valve after the slurry permeates for 1 hour, and finishing the group of tests.
Finally, collecting sand samples, analyzing test data, wherein the resistivity distribution and the permeation time change of each layer of soil are shown in figure 8, the mud content distribution and the permeation time change of each layer of soil are shown in figure 9, the control system fits the collected data according to the following equation c ═ f (rho), c is the mud content in the soil, and finally the curve equation of the mud content and the resistance is obtained, wherein rho is 97.70c-0.24Under the equation, according to the resistivity rho i (t) of the i-th layer of soil (the soil between the electrode rings of the i number and the i +1 number) measured in the dynamic slurry infiltration process, the resistivity is substituted into the formula to obtain the average slurry content ci (t) in the soil at the t moment, the slurry content in the sand sample collected after the test and the slurry content at the last moment measured by a resistance method are verified (as shown in table 2), and the slurry infiltration degree measured by the variation data of the pore pressure meter and the infiltration amount is basically consistent with the result obtained by the equation.
Actual content of mud in sand sample at time table 23600 s is compared with mud content measured by resistance method
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a mud infiltration post resistance measurement device, includes infiltration post, the resistance measurement mechanism of including the cavity, its characterized in that, resistance measurement mechanism includes electrode subassembly, resistance monitoring system, the infiltration post is connected with the electrode subassembly registrate, electrode subassembly includes that a plurality of electrode circles and a plurality of electrode circles are in interval distribution on the infiltration post length extending direction, resistance monitoring system is connected with the electrode circle in order to monitor the resistance between the two electrode circles.
2. The mud infiltration column resistance measurement device of claim 1, wherein: each electrode ring is concentrically fixed with the permeation column, and the electrode rings are fixed on the wall of the permeation column.
3. The mud infiltration column resistance measurement device of claim 1, wherein: the resistance monitoring system is of a single-arm Wheatstone bridge type.
4. A simulation slurry shield excavation face mud infiltration test device, includes mud infiltration post resistance measurement device and control system, cutting system, mud conveying system of any of claims 1-3, cutting system includes shift mechanism, driving motor and cutter mechanism, shift mechanism's removal end is connected with driving motor, driving motor's output and cutter mechanism are connected, cutter mechanism is located infiltration post one end, control system and driving motor, shift mechanism and mud conveying system are connected, mud conveying system is connected with the infiltration post, its characterized in that, resistance monitoring system with control system connects with the on-time and the on-interval of receiving resistance monitoring system measured data and adjusting resistance monitoring system.
5. The test device for simulating slurry penetration of the excavation face of the slurry shield as claimed in claim 4, wherein: the cutter mechanism comprises a cutter seat, a first blade and a second blade, wherein the first blade is distributed on the cutter seat in a cross shape, the second blade is provided with a cross center, and the length of the second blade is greater than that of the first blade.
6. The test device for simulating slurry penetration of the excavation face of the slurry shield as claimed in claim 5, wherein: the blade holder is the cross, blade one distributes along the cross armed lever of blade holder, blade two sets up the center of blade holder, blade one is trapezoidal and the top surface is fixed with the blade holder, the upper portion of blade two is the rectangle form and fixes with upper portion and blade holder, and the lower part of blade two is three horn shapes.
7. The test device for simulating slurry penetration of the excavation face of the slurry shield as claimed in claim 4, wherein: the displacement mechanism is arranged on one side of the penetrating column, the slurry conveying system comprises a pressure pump, a pressure stabilizing valve and a slurry storage tank, the pressure stabilizing valve is arranged on a connecting pipeline between the outlet end of the pressure pump and the slurry storage tank, and the slurry storage tank is connected with the penetrating column.
8. The test device for simulating slurry penetration of the excavation face of the slurry shield as claimed in claim 4, wherein: the device also comprises a pore pressure gauge, a constant pressure bottle and a water collecting barrel, wherein the pore pressure gauge and the electrode ring are arranged on the upper part of the permeation column, a water inlet at the lower part of the constant pressure bottle is connected with a percolation water outlet of the permeation column, and a water outlet at the upper part of the constant pressure bottle is connected with the water collecting barrel.
9. A method for simulating a slurry penetration test of a slurry shield excavation surface is characterized by comprising the following steps: a plurality of electrode rings are distributed in the cavity of the permeation column at intervals along the length extension direction of the permeation column, the resistance change of the soil body between the two electrode rings is monitored by a resistance monitoring system in the soil body permeation process of the slurry in the rings of the electrode rings, the data measured by the resistance monitoring system is collected by a control system, and the resistance change curve of the soil body in the slurry permeation process is fitted, wherein the calculation formula of the resistance is as follows
Rho is the resistivity of the soil body; u is a fixed applied voltage; a is the detected current value; r is the radius of the upper cylindrical barrel; l is the thickness of the soil layer.
10. The method for simulating the slurry penetration test of the shield excavation face of the slurry shield as claimed in claim 9, wherein: the relation curve between the mud content and the soil resistance conforms to the following formula: ρ ═ ac－bAnd c is the mud content in the soil body.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420464A (en) * | 2022-11-07 | 2022-12-02 | 西南交通大学 | Underground engineering fluid pressure simulation system, method and related equipment |
| CN116793917A (en) * | 2023-03-09 | 2023-09-22 | 山东交通学院 | Slurry balance shield slurry penetration test device and method |
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2021
- 2021-12-24 CN CN202111597914.7A patent/CN114235644A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420464A (en) * | 2022-11-07 | 2022-12-02 | 西南交通大学 | Underground engineering fluid pressure simulation system, method and related equipment |
| CN116793917A (en) * | 2023-03-09 | 2023-09-22 | 山东交通学院 | Slurry balance shield slurry penetration test device and method |
| CN116793917B (en) * | 2023-03-09 | 2024-03-22 | 山东交通学院 | Slurry balance shield slurry penetration test device and method |
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