CN114674742A - Device and method for measuring adhesiveness of frozen soil - Google Patents
Device and method for measuring adhesiveness of frozen soil Download PDFInfo
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- CN114674742A CN114674742A CN202210335561.1A CN202210335561A CN114674742A CN 114674742 A CN114674742 A CN 114674742A CN 202210335561 A CN202210335561 A CN 202210335561A CN 114674742 A CN114674742 A CN 114674742A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
Abstract
The invention provides a device and a method for measuring the adhesiveness of frozen soil, wherein the device comprises a heat-insulating cotton layer, a box body, a heat-insulating cover plate, a fan, a heat-insulating plate, a motor, a stirring rod, a blade, a steel basin, a steel plate, a screw, a wooden barrel (with a hole) and a preservative film; the side wall of the box body is provided with a fan and a steel plate; a fan is used for refrigerating to provide a constant temperature environment; the motor drives the stirring rod to stir and thicken the frozen soil blocks in the steel basin; the adhesion of the frozen soil can be studied by measuring the mass of the frozen soil adhered to the stirring rod. According to the ice content of the frozen soil sample per unit mass and the adhesion amount of the frozen soil per unit mass, the relation between the frozen ice content of the soil sample with different water content and the adhesion of the frozen soil in different freezing time periods can be obtained, so that an analysis basis is provided for preventing the shield from forming mud cakes in the frozen soil stratum.
Description
Technical Field
The invention relates to a device and a method for measuring the adhesiveness of frozen soil, and belongs to the technical field of frozen soil adhesiveness model tests.
Background
In the tunneling process of the shield tunneling machine, the phenomenon that soil bodies are adhered or shield cutter heads are blocked is often encountered. The adhesion force is the attraction force generated by the adsorption of water molecules between the soil body and the structure, and during the cutting and extrusion process of the cutter head of the shield tunneling machine in the soil body, a high-strength mud cake is easily formed at the center of the cutter head and gradually diffuses to the periphery, so that the cutter head and the cutter are wrapped, the soil layer cannot be effectively cut, the shield tunneling efficiency is reduced, and the construction period and the construction cost are greatly increased. With the development of traffic infrastructure, more shield tunnel projects will pass through the frozen soil area, so that it becomes necessary to study the adhesiveness of the frozen soil.
The research finds that the Xiaoyuhao adopts a self-made traction transmission adhesion force measuring device to measure the maximum value of the adhesion force of the cohesive soil under different water contents in an indoor test for reducing the adhesion force of the cohesive soil by an electroosmosis method; the Liu becomes in the influence of soil body water content and metal corrugated surface on interface adhesion, an adhesion pull-out test device with self design is adopted, the effect of cone surface corrugation protrusion measurement is realized by winding a metal wire, and the influence of different corrugation protrusion degrees and soil body water content change on interface adhesion characteristics is analyzed. The existing test device mainly aims at soil bodies with different water contents to measure the adhesion condition between a metal interface and the soil body, and the research on the adhesion characteristic of the frozen soil is lacked.
Therefore, the conventional techniques cannot measure the adhesiveness of frozen soil containing ice in a low-temperature environment, and further cannot determine the influence of the degree of ice on the adhesiveness of frozen soil.
Disclosure of Invention
The invention aims to research the influence of the ice content in frozen soil on the adhesiveness, and provides a device and a method for measuring the adhesiveness of the frozen soil.
The device for measuring the adhesiveness of the frozen soil comprises a constant temperature box, a stirring unit, a fixing unit, a temperature control unit and a sample preparation unit;
the constant temperature box comprises a box body 2, a heat insulation cotton layer 1, a heat insulation cover plate 3 and a heat insulation plate 5;
the stirring unit comprises a motor 6, a stirring rod 7 and a steel basin 10;
the fixing unit comprises a steel plate 11, a screw 12 and a screw 16;
the temperature control unit comprises a fan 4;
the sample preparation unit comprises a wooden barrel (with a hole) 13, a preservative film 14 and soil 15;
a stirring unit and a fan 4 are arranged in the box body 2; the fan 4 is fixed on the side wall of the box body 2; the stirring unit comprises a motor 6, a stirring rod 7 and a steel basin 10 from top to bottom, the bottom of the motor 6 is fixed on the upper portion of a steel plate 11 through screws 16, the stirring rod 7 is connected with the motor 6 and can be taken down, blades 17 are arranged on the stirring rod 7, the steel basin 10 is fixed at the bottom of the box body 2, and the stirring rod 7 is arranged in the steel basin 10 after being installed and is adjustable in height; the steel plate 11 is fixed on the side wall of the box body 2 by a screw 12; the inner wall of the box body 2 is provided with an insulation board 5; the top of the box body 2 is provided with a heat-insulating cover plate 3; the top of the heat-insulating cover plate 3 is provided with a heat-insulating cotton layer 1;
a layer of preservative film 14 is laid on the inner wall of the wooden barrel (with the hole) 13; the inner part of the preservative film 14 is wrapped with soil 15.
The method for measuring the adhesiveness of the frozen soil adopts the measuring device for measuring the adhesiveness of the frozen soil to connect, and comprises the following specific steps:
taking down a stirring rod 7 arranged on a motor 6 for initial weighing, and recording the mass as m';
secondly, turning on the fan 4, adding a proper amount of water 9 into the steel basin 10, and keeping the constant temperature in the constant temperature box at 0.1 ℃;
preparing a soil sample with specific water content w: laying a preservative film 14 on the inner wall of a wooden barrel (with a hole) 13; placing soil with specific water content w in the preservative film 14, and compacting in layers; when the wooden barrel (with holes) 13 is filled with soil, covering a preservative film 14, and completely wrapping the soil sample;
fourthly, after the soil sample with specific water content w is frozen for a certain time t, cutting the soil sample into frozen soil blocks 8 with the diameter of 1 cm-2 cm by using a soil cutter; weighing substanceAmount is M1The frozen soil blocks 8 are put into a steel basin 10; weighing mass M2The frozen soil mass 8 of (a) was subjected to a nuclear magnetic resonance test.
Turning on a motor 6, fully stirring for 3min, taking down a stirring rod 7 adhered with frozen soil, and weighing, wherein the mass is recorded as m'; from the calculation formula K ═ M '-M')/M1And obtaining the adhesion amount K of the frozen soil containing ice in unit mass, and determining the adhesion of the frozen soil containing ice in different degrees.
Sixthly, measuring the unfrozen water content of the frozen soil sample of unit mass by using a nuclear magnetic resonance technology, thereby obtaining the ice content of the frozen soil sample of unit mass.
Seventhly, repeating the step III to the step VI to obtain the ice content of the frozen soil sample per unit mass and the adhesion K of the frozen soil per unit mass after the soil samples with different water contents w are frozen for different time t.
Further, according to the ice content of the frozen soil sample per unit mass and the adhesion amount K of the frozen soil per unit mass, the relationship between the frozen ice content and the adhesion of the frozen soil of the soil samples with different water contents w after different freezing times t can be obtained, so that an analysis basis is provided for the prevention of shield mud cakes in the frozen soil stratum.
Advantageous effects
The invention provides a device and a method for measuring the adhesiveness of frozen soil, wherein the device comprises a heat-insulating cotton layer 1, a box body 2, a heat-insulating cover plate 3, a fan 4, a heat-insulating plate 5, a motor 6, a stirring rod 7, a steel basin 10, a steel plate 11, screws 12, a wooden barrel (with holes) 13, a preservative film 14, screws 16 and blades 17; the side wall of the box body is provided with a fan and a steel plate; a constant temperature environment is provided by the refrigeration of the fan; the motor is fixed on the steel plate through screws; the motor drives the stirring rod to stir and thicken the frozen soil blocks in the steel basin; by measuring the quality of the frozen soil adhered to the stirring rod, the relation between the frozen ice content and the frozen soil adhesiveness of the soil samples with different water contents w after different freezing times t can be obtained.
The invention has the following advantages:
1) by controlling a stable low-temperature environment, the ice content is ensured not to change greatly before and after stirring, and the adhesion amount of the frozen soil corresponding to the ice content is accurately measured;
2) the frozen soil with different ice degrees is measured, and the influence rule of the different ice degrees on the adhesiveness of the frozen soil can be researched.
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus for measuring adhesiveness of frozen soil according to the present invention;
FIG. 2 is a schematic structural diagram of a frozen soil sample preparation device according to the present invention;
FIG. 3 is a schematic structural view of a stirring rod according to the present invention;
description of reference numerals: the insulation board comprises an insulation cotton layer 1, a box body 2, an insulation cover plate 3, a fan 4, an insulation board 5, a motor 6, a stirring rod 7, a frozen soil block 8, water 9, a steel basin 10, a steel plate 11, a screw 12, a wooden barrel (with a hole) 13, a preservative film 14, soil 15, a screw 16 and a blade 17.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in FIGS. 1 to 3, the device for measuring the adhesiveness of frozen soil includes a thermostat, a stirring unit, a fixing unit, a temperature control unit, and a sample preparation unit;
the constant temperature box comprises a box body 2, a heat insulation cotton layer 1, a heat insulation cover plate 3 and a heat insulation plate 5;
the stirring unit comprises a motor 6, a stirring rod 7 and a steel basin 10;
the fixing unit comprises a steel plate 11, a screw 12 and a screw 16;
the temperature control unit comprises a fan 4;
the sample preparation unit comprises a wooden barrel (with a hole) 13, a preservative film 14 and soil 15;
a stirring unit and a fan 4 are arranged in the box body 2; the fan 4 is fixed on the side wall of the box body 2; the stirring unit comprises a motor 6, a stirring rod 7 and a steel basin 10 from top to bottom, the bottom of the motor 6 is fixed on the upper portion of a steel plate 11 through screws 16, the stirring rod 7 is connected with the motor 6 and can be taken down, blades 17 are arranged on the stirring rod 7, the steel basin 10 is fixed at the bottom of the box body 2, and the stirring rod 7 is arranged in the steel basin 10 after being installed and is adjustable in height; the steel plate 11 is fixed on the side wall of the box body 2 by screws 12; the inner wall of the box body 2 is provided with an insulation board 5; the top of the box body 2 is provided with a heat preservation cover plate 3; the top of the heat-insulating cover plate 3 is provided with a heat-insulating cotton layer 1;
a layer of preservative film 14 is laid on the inner wall of the wooden barrel (with the hole) 13; the inner part of the preservative film 14 is wrapped with soil 15.
The method for measuring the adhesiveness of the frozen soil adopts the device for measuring the adhesiveness of the frozen soil to connect, and comprises the following specific steps:
taking down a stirring rod 7 arranged on a motor 6 for initial weighing, and recording the mass as m';
secondly, turning on the fan 4, adding a proper amount of water 9 into the steel basin 10, and keeping the constant temperature in the constant temperature box at 0.1 ℃;
preparing a soil sample with specific water content w: laying a preservative film 14 on the inner wall of a wooden barrel (with a hole) 13; placing soil with specific water content w in the preservative film 14, and compacting in layers; when the wooden barrel (with the hole) 13 is filled with soil, the fresh-keeping film 14 is covered, and the soil sample is completely wrapped;
fourthly, after the soil sample with specific water content w is frozen for a certain time t, cutting the soil sample into frozen soil blocks 8 with the diameter of 1 cm-2 cm by using a soil cutter; weighing mass M1The frozen soil block 8 is put into a steel basin 10; weighing mass M2The frozen soil block 8 was subjected to nuclear magnetic resonance testing.
Turning on a motor 6, fully stirring for 3min, taking down a stirring rod 7 adhered with frozen soil, and weighing, wherein the mass is recorded as m'; from the calculation formula K ═ M '-M')/M1And obtaining the adhesion amount K of the frozen soil containing ice in unit mass, and determining the adhesion of the frozen soil containing ice in different degrees.
Sixthly, measuring the unfrozen water content of the frozen soil sample of unit mass by using a nuclear magnetic resonance technology, thereby obtaining the ice content of the frozen soil sample of unit mass.
Seventhly, repeating the step III to the step VI to obtain the ice content of the frozen soil sample per unit mass and the adhesion K of the frozen soil per unit mass after the soil samples with different water contents w are frozen for different time t.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (3)
1. The device for measuring the adhesiveness of the frozen soil is characterized by comprising a constant temperature box, a stirring unit, a fixing unit, a temperature control unit and a sample preparation unit;
the constant temperature box comprises a box body (2), a heat insulation cotton layer (1), a heat insulation cover plate (3) and a heat insulation plate (5);
the stirring unit comprises a motor (6), a stirring rod (7) and a steel basin (10);
the fixing unit comprises a steel plate (11), a screw (12) and a screw (16);
the temperature control unit comprises a fan (4);
the sample preparation unit comprises a wooden barrel (with a hole) (13), a preservative film (14) and soil (15);
a stirring unit and a fan (4) are arranged in the box body (2); the fan (4) is fixed on the side wall of the box body (2); the stirring unit is composed of a motor (6), a stirring rod (7) and a steel basin (10) from top to bottom, the bottom of the motor (6) is fixed on the upper portion of a steel plate (11) through screws (16), the stirring rod (7) is connected with the motor (6) and can be taken down, blades (17) are arranged on the stirring rod (7), the steel basin (10) is fixed at the bottom of the box body (2), and the stirring rod (7) is located inside the steel basin (10) after being installed and is adjustable in height; the steel plate (11) is fixed on the side wall of the box body (2) by a screw (12); the inner wall of the box body (2) is provided with a heat insulation plate (5); the top of the box body (2) is provided with a heat-insulating cover plate (3); the top of the heat-insulating cover plate (3) is provided with a heat-insulating cotton layer (1);
a layer of preservative film (14) is laid on the inner wall of the wooden barrel (with the hole) (13); the inner part of the preservative film (14) is wrapped with soil (15).
2. The method for measuring the adhesiveness of ice-containing soil, which is characterized by connecting the apparatus for measuring the adhesiveness of ice-containing soil according to claim 1, comprising the following steps:
taking down a stirring rod (7) arranged on a motor (6) for initial weighing, and recording the mass as m';
secondly, turning on a fan (4), adding a proper amount of water (9) into the steel basin (10), and keeping the constant temperature in the constant temperature box at 0.1 ℃;
preparing a soil sample with specific water content w: laying a preservative film (14) on the inner wall of the wooden barrel (with the hole) (13); placing soil with specific water content w in a preservative film (14), and compacting in layers; when the wooden barrel (with the hole) (13) is filled with soil, a preservative film (14) is covered to completely wrap the soil sample;
fourthly, after the soil sample with specific water content w is frozen for a certain time t, cutting the soil sample into frozen soil blocks (8) with the diameter of 1 cm-2 cm by using a soil cutter; weighing mass M1The frozen soil block (8) is put into a steel basin (10); weighing mass M2The frozen soil block (8) was subjected to nuclear magnetic resonance testing.
Turning on a motor (6), fully stirring for 3min, taking down a stirring rod (7) adhered with frozen soil, and weighing, wherein the mass is recorded as m'; by calculating the formula K ═ (M '-M')/M1And obtaining the adhesion amount K of the frozen soil containing ice in unit mass, and determining the adhesion of the frozen soil containing ice in different degrees.
Sixthly, measuring the unfrozen water content of the frozen soil sample of unit mass by using a nuclear magnetic resonance technology, thereby obtaining the ice content of the frozen soil sample of unit mass.
Seventhly, repeating the step III to the step VI to obtain the ice content of the frozen soil sample per unit mass and the adhesion K of the frozen soil per unit mass after the soil samples with different water contents w are frozen for different time t.
3. The method according to claim 2, wherein according to the ice content of the frozen soil sample per unit mass and the adhesion amount K of the frozen soil per unit mass, the relationship between the frozen ice content and the frozen soil adhesion of the soil samples with different water contents w after different freezing times t can be obtained, so as to provide an analysis basis for the prevention of shield-induced mudcake in the frozen soil stratum.
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| CN202210335561.1A CN114674742A (en) | 2022-03-26 | 2022-03-26 | Device and method for measuring adhesiveness of frozen soil |
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| CN202210335561.1A CN114674742A (en) | 2022-03-26 | 2022-03-26 | Device and method for measuring adhesiveness of frozen soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117782973A (en) * | 2024-02-23 | 2024-03-29 | 易事特智能化系统集成有限公司 | Wind turbine blade surface ice adhesion strength measuring device |
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- 2022-03-26 CN CN202210335561.1A patent/CN114674742A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117782973A (en) * | 2024-02-23 | 2024-03-29 | 易事特智能化系统集成有限公司 | Wind turbine blade surface ice adhesion strength measuring device |
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