CN111735843A - Casing pipe type soil body one-dimensional hydrothermal migration testing device and testing method - Google Patents
Casing pipe type soil body one-dimensional hydrothermal migration testing device and testing method Download PDFInfo
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- CN111735843A CN111735843A CN202010649259.4A CN202010649259A CN111735843A CN 111735843 A CN111735843 A CN 111735843A CN 202010649259 A CN202010649259 A CN 202010649259A CN 111735843 A CN111735843 A CN 111735843A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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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
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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Abstract
The invention discloses a casing pipe type soil body one-dimensional hydrothermal migration testing device and a testing method, wherein the device comprises a casing pipe, a cover plate, a heating plate, screws, a needle type sensor, permeable stones, a porous bottom plate, test soil and the like; the invention can carry out test determination of the one-dimensional hydrothermal migration rule of the soil body, can carry out local heating test on soil samples with different water contents, cut the samples, test and observe the temperature and the water content conditions at different distances from a heating surface, and analyze the one-dimensional hydrothermal migration rule; the method can be used for simulating that high temperature is generated due to friction heating after the mud cake is formed on the metal cutter head in the tunneling process of the shield tunneling machine, the property of the soil body of the excavation surface is influenced, and the generation of the mud cake is accelerated, so that the common engineering problem that the mud cake is formed on the cutter head is solved, and a test means is provided for obtaining the formation mechanism and the development rule of the shield mud cake.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering model tests, and particularly relates to a one-dimensional hydrothermal migration testing device and a testing method for geotechnical model soil.
Background
The clay debris cut by the shield cutter head when the shield cutter head passes through the clay stratum can be adhered to the surface of the cutter head, solid or semisolid blocks are formed under the extrusion action of the cutter head and are adhered to and block the cutter head, so that the penetration of a cutter is reduced when the stratum is cut, the shield excavation efficiency is reduced, and the adhesion of soil and the surface of the cutter head is one of important reasons for generating mud cakes on the surface of the cutter head. The existence of mud cake not only can lead to the increase of shield structure blade disc moment of torsion, still can block up the thick liquid mouth of inhaling of arranging the thick liquid pipe, will seriously influence shield structure construction technique and construction safety, and the processing and the restoration of a series of construction problems such as dregs improvement, mud cake are clear away, shield structure system transformation, shut down the operation of opening the cabin, risk are taken precautions against, greatly increased construction cost.
Under the normal working condition, the temperature of the shield cutter head is generally 40-50 ℃, but in the tunneling process of the shield, particularly under the condition of a composite stratum, the torque and the total thrust of the cutter head are greatly increased and the propelling speed is reduced along with the formation and the increase of mud cakes, so that the temperature of the cutter head is as high as 400-500 ℃ and even higher.
Researches show that the water content and the temperature of the soil body have great influence on the adhesion characteristics of the soil body and an interface, so that the formation mechanism and the development rule of the shield mud cake are required to be obtained, the common engineering problem that a cutter head is stuck with the mud cake is solved, the property of the soil body of an excavation surface influenced by the high temperature of the cutter head is required to be known, and the research on the hydrothermal migration rule of the soil body in a heating state is necessary. The invention can provide a casing pipe type soil body one-dimensional hydrothermal migration testing device and a testing method, and provides a testing means for solving the rule of influence of temperature on soil body properties.
Disclosure of Invention
In order to research the change rule of water and temperature in the soil body in the heating state of the soil body, the invention provides a model test sleeve type one-dimensional hydrothermal migration test device and a test method for the soil body.
The technical scheme adopted by the invention is as follows:
the utility model provides a bushing type soil body one-dimensional to hydrothermal migration testing arrangement which characterized in that: the device comprises a sleeve, a cover plate, a heating plate, screws, a needle type sensor, a permeable stone, a porous bottom plate, test soil and the like; the multiple sections of annular sleeves are mutually spliced by screw fixation, the leftmost end is fixed with a porous bottom plate by screws, the right side of the bottom plate is tightly attached to the permeable stone, and the rightmost end is fixed with a cover plate by screws to form a soil box; the soil box is filled with test soil, and the test soil is tightly attached to the heating plate.
The inner wall of the sleeve is provided with a heat insulation layer, the inner ring part at one end of each layer of sleeve is sunken to form an alignment groove, the inner ring part at the other end of each layer of sleeve is protruded, a circle of sealing rubber is arranged on the outer edge of the protruded part, the sleeves are mutually lapped end to be fixed by screws, and the sleeve body of each layer of sleeve is provided with small holes for inserting the needle type sensor.
The porous bottom plate and the lap joint sleeve are mutually fixed by screws, the surface of the porous bottom plate is provided with a plurality of small holes, and the permeable stone is tightly attached to the inside of the porous bottom plate.
The cover plate and the lap joint sleeve are mutually fixed through screws, and a heating plate is arranged inside the cover plate.
A casing pipe type soil one-dimensional hydrothermal migration test method is characterized by comprising the following steps:
(1) determining the number of layers of sleeves according to the requirement of the hydrothermal migration distance of a tested soil body, overlapping the sleeves, fixing the sleeves by screws, installing and fixing a porous bottom plate, smearing a layer of vaseline on the inner wall, and placing a permeable stone;
(2) cutting a piece of filter paper with the same section size as the permeable stone, placing the filter paper in a sleeve to be attached to the permeable stone, filling test soil in layers and tamping the filter paper to a sleeve opening;
(3) filling test soil in layers and tamping to a casing opening;
(4) covering the cover plate, attaching the heating plate to the test soil, and fixing the cover plate;
(5) horizontally placing the device, and inserting the needle sensor into the soil body from the small hole of the casing pipe body;
(6) switching on a power supply of the heating plate, connecting the needle type sensor to the data acquisition device, and opening the data acquisition device to acquire temperature data;
(7) after the test is finished, the power supply and the sensors are turned off, the needle type sensors are pulled out, the cover plates are opened, the sleeves are sequentially removed, when one layer of sleeve is removed, the soil sample is cut into slices in order by a soil test cutting wire saw along the top surfaces of the sleeves, and the change conditions of the water content of the soil body at different distances from the heating surface are recorded after weighing and drying.
Advantageous effects
The invention can carry out test and determination of the one-dimensional hydrothermal migration rule of the soil body, can be used for simulating that high temperature is generated due to friction heating after the mud cake is formed on the metal cutter head in the tunneling process of the shield tunneling machine, and the soil body property of the excavation surface is influenced, so that the generation of the mud cake is accelerated, and provides a test means for solving the common engineering problem of the mud cake formed on the cutter head and obtaining the formation mechanism and the development rule of the shield mud cake.
Description of the drawings:
fig. 1 is a three-dimensional view of a casing-type soil one-dimensional hydrothermal migration testing device provided by the invention;
fig. 2 is a structural diagram of a casing pipe type soil one-dimensional hydrothermal migration testing device provided by the invention;
FIG. 3 is a partial cross-sectional view of the base plate of FIG. 1;
FIG. 4 is a partial cross-sectional view of the cover of FIG. 1;
FIG. 5 is a partial cross-sectional view of the sleeve of FIG. 1;
FIG. 6 is a cross-sectional view of the bushing coupling of FIG. 1;
in the attached figures 1-6
The device comprises a sleeve 1, a cover plate 2, a heating plate 3, screws 4, a needle type sensor 5, a permeable stone 6, a porous bottom plate 7, test soil 8, a heat preservation layer 9 and sealing rubber 10.
The specific implementation mode is as follows:
in order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 6, a casing pipe type soil one-dimensional hydrothermal migration testing device and a testing method thereof are characterized in that:
the utility model provides a bushing type soil body one-dimensional to hydrothermal migration testing arrangement which characterized in that: the device comprises a sleeve 1, a cover plate 2, a heating plate 3, a screw 4, a needle type sensor 5, a permeable stone 6, a porous bottom plate 7, test soil 8 and the like. The multiple sections of annular sleeves 1 are fixed and mutually spliced by screws 4, the leftmost end is fixed with a porous bottom plate 7 by the screws 4, the right side of the bottom plate is tightly attached to a permeable stone 6, and the rightmost end is fixed with a cover plate 2 by the screws 4 to form a soil box; the soil box is filled with test soil 8, and the test soil 8 is tightly attached to the heating plate 3.
The inner wall of each sleeve 1 is provided with a heat-insulating layer 9, the inner ring part at one end of each sleeve 1 is sunken to form a registration groove, the inner ring part at the other end of each sleeve 1 is protruded, a circle of sealing rubber 10 is arranged on the outer edge of the protruded part, the sleeves 1 are aligned by the registration grooves, the sleeves are fixed by screws 4 after being overlapped end to end, and the number of layers of the sleeves 1 is determined according to the requirement of the test heating influence range; a tube body of each layer of the sleeve 1 is provided with a small hole for inserting the needle type sensor 5, and in order to ensure the sealing property between the small hole part and the needle type sensor 5, a gap between the small hole part and the needle type sensor 5 is filled with hot paraffin or hot resin after the needle type sensor 5 is inserted; the sleeve 1 can be one of a hollow cylinder or a hollow prism and is made of metal or engineering plastics; the needle sensor 5 can be a temperature sensor, a soil moisture sensor or a multifunctional sensor.
The porous bottom plate 7 and the lap joint sleeve 1 are mutually fixed through screws 4, a plurality of small holes are formed in the surface of the porous bottom plate 7, the permeable stone 6 is tightly attached to the inside of the porous bottom plate 7, and in a hydrothermal migration test, the wall of the sleeve 1 is sealed, and the bottom of the sleeve is a unique through hole, so that one-dimensional hydrothermal migration is realized.
The cover plate 2 and the lap joint sleeve 1 are mutually fixed through screws 4, the heating plate 3 is arranged inside the cover plate 2, the size of the heating plate 3 is determined according to a test simulation proportion, and the heating power and the temperature can be controlled according to the test heating temperature requirement.
And the soil type, the water content compactness and other parameters of the test soil 8 are determined according to test requirements, 1-2 ring sleeves 1 are fixed in each lap joint, and the test soil 8 is filled in layers and tamped.
Claims (5)
1. The utility model provides a bushing type soil body one-dimensional to hydrothermal migration testing arrangement which characterized in that: the device comprises a sleeve (1), a cover plate (2), a heating plate (3), a screw (4), a needle type sensor (5), a permeable stone (6), a porous bottom plate (7), test soil (8) and the like;
the multi-section annular sleeves (1) are fixed and spliced by screws (4), the leftmost end is fixed with a porous bottom plate (7) by the screws (4), the right side of the bottom plate is tightly attached to a permeable stone (6), and the rightmost end is fixed with a cover plate (2) by the screws (4) to form a soil box; the soil box is filled with test soil (8), and the test soil (8) is tightly attached to the heating plate (3).
2. The casing pipe type soil one-dimensional hydrothermal migration testing device according to claim 1, wherein a heat insulation layer (9) is arranged on the inner wall of each casing pipe (1), an inner ring part at one end of each casing pipe (1) is sunken to form an alignment groove, an inner ring part at the other end of each casing pipe is protruded, a circle of sealing rubber (10) is arranged on the outer edge of each protruded part, the casing pipes (1) are mutually overlapped end to end and fixed by screws (4), and a pipe body of each casing pipe (1) is provided with a small hole for inserting the needle sensor (5).
3. The casing pipe type soil one-dimensional hydrothermal migration testing device according to claim 1, wherein the porous bottom plate (7) and the overlapping casing pipe (1) are fixed with each other through screws (4), the surface of the porous bottom plate (7) is provided with a plurality of small holes, and the permeable stone (6) is tightly attached to the inside of the porous bottom plate (7).
4. The casing pipe type soil one-dimensional hydrothermal migration testing device according to claim 1, wherein the cover plate (2) and the lap joint casing pipe (1) are fixed with each other through screws (4), and a heating plate (3) is arranged inside the cover plate (2).
5. A casing pipe type one-dimensional soil body hydrothermal migration test method is characterized in that the casing pipe type one-dimensional soil body hydrothermal migration test device of any one of claims 1 to 4 is used for testing, and the method comprises the following steps:
step 1: determining the layer number of the sleeves (1) according to the requirement of the hydrothermal migration distance of a test soil (8), overlapping the sleeves (1) and fixing the sleeves by screws (4), installing and fixing a porous bottom plate (7), smearing a layer of vaseline on the inner wall, and placing a permeable stone (6);
step 2: cutting a piece of filter paper with the same section size as the permeable stone (6), placing the filter paper in the sleeve (1) to be attached to the permeable stone (6), filling test soil (8) in layers and tamping the filter paper to the opening of the sleeve (1);
and step 3: filling test soil (8) layer by layer and tamping to the opening of the casing (1);
and 4, step 4: covering the cover plate (2), attaching the heating plate (3) to the test soil (8), and fixing the cover plate (2);
and 5: horizontally placing the device, and inserting the needle sensor (5) into the soil body from the small hole of the tube body of the sleeve (1);
step 6: connecting a power supply of the heating plate (3), connecting the needle type sensor (5) to the data acquisition device, opening the data acquisition device and acquiring temperature data;
and 7: after the test is finished, a power supply and the sensors are turned off, the needle type sensors (5) are pulled out, the cover plate (2) is opened, the sleeves (1) are sequentially removed, when one layer of the sleeve (1) is removed, a soil sample is cut into slices in order by a soil test soil cutting wire saw along the top surface of the sleeve (1), and the change conditions of the water content of the soil body at different distances from the heating surface are recorded after weighing and drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649259.4A CN111735843A (en) | 2020-07-05 | 2020-07-05 | Casing pipe type soil body one-dimensional hydrothermal migration testing device and testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649259.4A CN111735843A (en) | 2020-07-05 | 2020-07-05 | Casing pipe type soil body one-dimensional hydrothermal migration testing device and testing method |
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| CN111735843A true CN111735843A (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010649259.4A Pending CN111735843A (en) | 2020-07-05 | 2020-07-05 | Casing pipe type soil body one-dimensional hydrothermal migration testing device and testing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295512A (en) * | 2021-12-31 | 2022-04-08 | 中国地质大学（武汉） | Device and method for measuring soil moisture characteristic curve and unsaturated permeability coefficient |
| CN117890394A (en) * | 2024-03-14 | 2024-04-16 | 中铁七局集团第三工程有限公司 | Device and method for detecting mud cake of shield cutter head |
-
2020
- 2020-07-05 CN CN202010649259.4A patent/CN111735843A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295512A (en) * | 2021-12-31 | 2022-04-08 | 中国地质大学（武汉） | Device and method for measuring soil moisture characteristic curve and unsaturated permeability coefficient |
| CN117890394A (en) * | 2024-03-14 | 2024-04-16 | 中铁七局集团第三工程有限公司 | Device and method for detecting mud cake of shield cutter head |
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