CN110568019A - partition electroosmosis viscosity reduction test device and test method for stepping and pressure changing between soil body and metal interface - Google Patents
partition electroosmosis viscosity reduction test device and test method for stepping and pressure changing between soil body and metal interface Download PDFInfo
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- CN110568019A CN110568019A CN201910799042.9A CN201910799042A CN110568019A CN 110568019 A CN110568019 A CN 110568019A CN 201910799042 A CN201910799042 A CN 201910799042A CN 110568019 A CN110568019 A CN 110568019A
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- 238000005370 electroosmosis Methods 0.000 title claims abstract description 85
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 238000005192 partition Methods 0.000 title claims abstract description 20
- 230000009467 reduction Effects 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000001131 transforming effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011160 research 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
the invention provides a zonal electroosmosis viscosity reduction test device and a test method for stepping and transforming pressure between a soil body and a metal interface, wherein the device comprises a device base, an electroosmosis anode, an electroosmosis cathode, a stepping transformation device, a conductive rod, a conductive sheet, a device box, a base I, a base II, a connecting rod and a bolt; when the device is contacted with the soil body, the electroosmosis anode in the device is deformed with the base I, the conducting rod moves downwards and is contacted with the conducting strips connected with different voltages, the effect of automatic gear shifting and voltage transformation under different pressed states is realized, the electroosmosis voltage of different partitions is changed, and the device is an effective means for optimizing viscosity reduction and resistance reduction between the soil body and a metal interface.
Description
Technical Field
the invention belongs to the technical field of tunnel and underground engineering test instruments, and particularly relates to a partitioned electroosmosis viscosity reduction test device and a test method for step-by-step variable pressure between a soil body and a metal interface.
Background
with the economic development and the technological progress of China, the tunnel traffic construction is developed rapidly, and the shield technology plays an important role. The shield technology is widely applied by virtue of the advantages of high applicability, high construction speed and the like, however, when the shield passes through a water-rich and sticky stratum, mud cakes are easily formed in the center area of a shield cutter head and continuously spread, and the serious phenomenon of mud cake formation of the cutter head causes the problems of serious cutter wear, increased cutter head torque and the like, so that the chain reactions of engineering cost increase, construction period delay and the like are caused. Therefore, the method for searching the adhesion problem between the cutter head and the soil body and effectively eliminating the adhesion between the soil body and the cutter head has very important practical significance.
at present, a plurality of experts and scholars use an electroosmosis method to carry out experimental research; such as: the experiment shows that in the case of electroosmosis, the bulldozing resistance is smaller and the viscosity reduction effect is good. However, the adhesion conditions of different parts of the device and the soil body are different, the existing electroosmosis viscosity reducing device usually performs electroosmosis test at rated voltage, and proper voltage cannot be automatically selected for electroosmosis according to the actual adhesion conditions between the soil body and different positions of the device in the test process so as to achieve the optimal electroosmosis effect.
when the device is contacted with the soil body, an electroosmosis anode and a base I deform, a conducting rod moves downwards and is contacted with conducting strips connected with different voltages, the effect of automatic gear shifting and pressure changing under different pressure states is achieved, the electroosmosis voltage of different partitions is changed, and the device is an effective means for optimizing viscosity reduction and resistance reduction between the soil body and the metal interface.
Disclosure of Invention
the invention provides a subarea electroosmosis viscosity reduction test device and a test method for stepping variable pressure between a soil body and a metal interface, aiming at solving the problem that proper voltage cannot be automatically selected for electroosmosis according to the actual adhesion condition between different positions of the soil body and the device when the device is contacted with the soil body at present, when the device is contacted with the soil body, a base I8 and an electroosmosis anode 2 of each subarea generate deformation with different degrees under the action of different loads, and a conductive rod 5 in a stepping variable pressure device 4 is driven to generate vertical sliding with different amplitudes, so that the supply voltage of each subarea is changed, and the effect of controlling the differential electroosmosis of each subarea is achieved.
A subregion electric osmosis visbreaking test device that is used for stepping variable pressure formula between soil body and metal interface, characterized by, including device base 1, electric osmosis positive pole 2, electric osmosis negative pole 3, stepping potential device 4, conducting rod 5, conducting strip 6, device box 7, base I8, base II 9, tie rod 10, bolt 11;
the device base 1 is made of hard insulating materials, and 9 square grooves with the width of 3cm and the depth of 0.8cm are uniformly formed in the upper surface of the device base and used for accommodating the electroosmosis cathode 3; a connecting rod 10 is arranged at the center of the lower part and fixedly connected by a bolt 11, and a groove and the bolt 11 are arranged at the tail part of the connecting rod 10 and can be connected with a drawing force measuring device;
The electroosmosis cathode 3 is provided with a hole at the center position and accommodates the stepping transformation device 4; a base I8 is arranged at the upper part of the stepping transformation device 4, and the base I8 is made of elastic insulating hydrophobic material so as to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode 3 in the electroosmosis process; the base I8 is embedded into the hole of the electroosmosis cathode 3, so that the base I8 is ensured to be sufficiently deformed after being extruded;
The base II 9 is spirally arranged on the electroosmosis cathode 3 and is connected with the base I8; the base II 9 adopts hard insulating hydrophobic material to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode 3 in the electroosmosis process;
the electroosmotic anode 2 is arranged on the base I8 and the base II 9 in a spiral shape.
further, the stepping transformer 4 is composed of a conductive rod 5, a conductive sheet 6 and a device box 7; the device box 7 is made of insulating materials, is internally provided with a slotted hole and contains the conductive rod 5 and the conductive sheet 6;
one end of the conductive rod 5 is connected with the electroosmosis anode 2, the other end of the conductive rod is contacted with the conductive sheet 6, and when the base I8 deforms, the conductive rod 5 can generate downward displacement;
the outer walls of the conducting rods 5 except the end parts contacted with the conducting strips 6 are coated with insulating coatings, so that the conducting rods 5 are prevented from being contacted with the two conducting strips 6 simultaneously when moving downwards;
One end of the conducting strip 6 is in a pincer shape and is ensured to be fully contacted with the conducting rod 5, one end of the conducting strip is fixed on the inner wall of the device box and is distributed in three layers at equal intervals, the conducting strip is sequentially connected with the positive electrodes of low voltage, medium voltage and high voltage from top to bottom, and any point below the electroosmosis cathode 3 is connected with the negative electrode of the power supply.
Further, the base I8 of each partition is deformed to different degrees under different loads, and the conductive rod 5 in the step transformer 4 is driven to slide up and down in different amplitudes, so that the supply voltage of each partition is changed, and differential electroosmosis of each partition is controlled.
a partition electroosmosis viscosity reduction test method for stepping variable pressure between a soil body and a metal interface adopts the partition electroosmosis viscosity reduction test device for stepping variable pressure between the soil body and the metal interface to carry out electroosmosis test, and comprises the following steps:
Step 1: the device is fixed on a drawing test device, and the stepped voltage transformation device 4 and the electroosmosis cathode 3 of each partition are connected with the positive pole and the negative pole of three external power supplies with different voltages, so that the communication of circuits is ensured;
step 2: applying normal pressure to the device, and when the device is in contact extrusion with a soil body, the electroosmosis anodes 2 and the base I8 at the central positions of the partitions deform to enable the conductive rods 6 to move downwards and connect voltages of different gears according to different compression deformation sizes;
And step 3: when the device is completely contacted with the soil body, standing for t min to keep an electroosmosis state;
and 4, step 4: and (5) after standing for t min, applying normal tension to the device, pulling the device out of the soil body, and ending electroosmosis.
Advantageous effects
the invention provides a subarea electroosmosis viscosity reduction test device and a test method for stepping and variable pressure between a soil body and a metal interface, wherein the device comprises a device base 1, an electroosmosis anode 2, an electroosmosis cathode 3, a stepping variable pressure device 4, a conductive rod 5, a conductive sheet 6, a device box 7, a base I8, a base II 9, a connecting rod 10 and a bolt 11; when the device is contacted with the soil body, the base I8 and the electroosmosis anode 2 of each subarea generate deformation with different degrees under the action of different loads, the conductive rod 5 in the stepping transformation device 4 is driven to slide up and down with different amplitudes, so that the supply voltage of each subarea is changed, the effect of controlling the differential electroosmosis of each subarea is achieved, and the problem that the electroosmosis cannot be carried out by independently selecting proper voltage according to the actual adhesion condition between the soil body and different positions of the device when the device is contacted with the soil body at present is effectively solved.
drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention, wherein (a) is a cross-sectional view of the device and (b) is a top view of the device;
FIG. 2 is a schematic view of the connection of a stepped voltage transformation device with an electroosmotic anode;
FIG. 3 is a top view of a stepping transformer
description of reference numerals: the device comprises a device base 1, an electroosmosis anode 2, an electroosmosis cathode 3, a stepping transformation device 4, a conductive rod 5, a conductive sheet 6, a device box 7, a base I8, a base II 9, a connecting rod 10 and a bolt 11.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1-3, a zonal electroosmosis viscosity reduction test device for step-by-step voltage transformation between soil and metal interfaces is characterized by comprising a device base 1, an electroosmosis anode 2, an electroosmosis cathode 3, a step-by-step voltage transformation device 4, a conductive rod 5, a conductive sheet 6, a device box 7, a base I8, a base II 9, a connecting rod 10 and a bolt 11;
The device base 1 is made of hard insulating materials, and 9 square grooves with the width of 3cm and the depth of 0.8cm are uniformly formed in the upper surface of the device base and used for accommodating the electroosmosis cathode 3; a connecting rod 10 is arranged at the center of the lower part and fixedly connected by a bolt 11, and a groove and the bolt 11 are arranged at the tail part of the connecting rod 10 and can be connected with a drawing force measuring device;
The electroosmosis cathode 3 is provided with a hole at the center position and accommodates the stepping transformation device 4; a base I8 is arranged at the upper part of the stepping transformation device 4, and the base I8 is made of elastic insulating hydrophobic material so as to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode 3 in the electroosmosis process; the base I8 is embedded into the hole of the electroosmosis cathode 3, so that the base I8 is ensured to be sufficiently deformed after being extruded;
The base II 9 is spirally arranged on the electroosmosis cathode 3 and is connected with the base I8; the base II 9 adopts hard insulating hydrophobic material to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode 3 in the electroosmosis process;
the electroosmotic anode 2 is arranged on the base I8 and the base II 9 in a spiral shape.
Further, the stepping transformer 4 is composed of a conductive rod 5, a conductive sheet 6 and a device box 7; the device box 7 is made of insulating materials, is internally provided with a slotted hole and contains the conductive rod 5 and the conductive sheet 6;
One end of the conductive rod 5 is connected with the electroosmosis anode 2, the other end of the conductive rod is contacted with the conductive sheet 6, and when the base I8 deforms, the conductive rod 5 can generate downward displacement;
The outer walls of the conducting rods 5 except the end parts contacted with the conducting strips 6 are coated with insulating coatings, so that the conducting rods 5 are prevented from being contacted with the two conducting strips 6 simultaneously when moving downwards;
One end of the conducting strip 6 is in a pincer shape and is ensured to be fully contacted with the conducting rod 5, one end of the conducting strip is fixed on the inner wall of the device box and is distributed in three layers at equal intervals, the conducting strip is sequentially connected with the positive electrodes of low voltage, medium voltage and high voltage from top to bottom, and any point below the electroosmosis cathode 3 is connected with the negative electrode of the power supply.
further, the base I8 of each partition is deformed to different degrees under different loads, and the conductive rod 5 in the step transformer 4 is driven to slide up and down in different amplitudes, so that the supply voltage of each partition is changed, and differential electroosmosis of each partition is controlled.
a partition electroosmosis viscosity reduction test method for stepping variable pressure between a soil body and a metal interface adopts the partition electroosmosis viscosity reduction test device for stepping variable pressure between the soil body and the metal interface to carry out electroosmosis test, and comprises the following steps:
step 1: the device is fixed on a drawing test device, and the stepped voltage transformation device 4 and the electroosmosis cathode 3 of each partition are connected with the positive pole and the negative pole of three external power supplies with different voltages, so that the communication of circuits is ensured;
Step 2: applying normal pressure to the device, and when the device is in contact extrusion with a soil body, the electroosmosis anodes 2 and the base I8 at the central positions of the partitions deform to enable the conductive rods 6 to move downwards and connect voltages of different gears according to different compression deformation sizes;
and step 3: when the device is completely contacted with the soil body, standing for t min to keep an electroosmosis state;
And 4, step 4: and (5) after standing for t min, applying normal tension to the device, pulling the device out of the soil body, and ending electroosmosis.
the invention has been explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method and core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the invention.
Claims (4)
1. a subregion electric osmosis visbreaking test device that is used for stepping variable pressure formula between soil body and metal interface, characterized by, including device base (1), electric osmosis positive pole (2), electric osmosis negative pole (3), stepping potential device (4), conducting rod (5), conducting strip (6), device box (7), base I (8), base II (9), brace rod (10), bolt (11);
the device base (1) is made of hard insulating materials, and 9 square grooves with the width of 3cm and the depth of 0.8cm are uniformly formed in the upper surface of the device base and used for accommodating the electroosmosis cathode (3); a connecting rod (10) is arranged at the center of the lower part and fixedly connected by a bolt (11), and a groove and the bolt (11) are arranged at the tail part of the connecting rod (10) and can be connected with a drawing force measuring device;
the electroosmosis cathode (3) is provided with a hole at the central position and accommodates the stepping transformation device (4); a base I (8) is arranged at the upper part of the stepping transformation device (4), and the base I (8) is made of an elastic insulating hydrophobic material so as to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode (3) in the electroosmosis process; the base I (8) is embedded into the hole of the electroosmosis cathode (3) to ensure that the base I (8) has sufficient deformation after being extruded;
the base II (9) is spirally arranged on the electroosmosis cathode (3) and is connected with the base I (8); the base II (9) adopts hard insulating hydrophobic material to prevent the short circuit of the device caused by water gathered at the electroosmosis cathode (3) in the electroosmosis process;
The electroosmotic anode (2) is spirally arranged on the base I (8) and the base II (9).
2. the device according to claim 1, characterized in that the stepping transformer device (4) consists of a conductive rod (5), a conductive sheet (6) and a device box (7); the device box (7) is made of insulating materials, a slotted hole is formed in the device box, and the conductive rod (5) and the conductive sheet (6) are accommodated in the slotted hole;
one end of the conductive rod (5) is connected with the electroosmosis anode (2), the other end of the conductive rod is contacted with the conductive sheet (6), and when the base I (8) deforms, the conductive rod (5) can generate downward displacement;
the outer walls of the conductive rods (5) except the end parts contacted with the conductive sheets (6) are coated with insulating coatings, so that the conductive rods (5) are prevented from contacting with the two conductive sheets (6) when moving downwards;
one end of the conducting strip (6) is in a pincer shape and is ensured to be fully contacted with the conducting rod (5), the other end of the conducting strip is fixed on the inner wall of the device box and is distributed in three layers at equal intervals, the conducting strip is sequentially connected with the positive electrodes of low voltage, medium voltage and high voltage from top to bottom, and any point below the electroosmosis cathode (3) is connected with the negative electrode of the power supply.
3. the device according to claim 1, wherein the base I (8) of each zone deforms to different degrees under different loads, and the conductive rods (5) in the step transformer (4) are driven to slide up and down in different amplitudes, so that the supply voltage of each zone is changed, and differential electroosmosis of each zone is controlled.
4. A method for the zonal electroosmosis viscosity reduction test of the stepping variable pressure type between the soil body and the metal interface, which is characterized in that the zonal electroosmosis viscosity reduction test device for the stepping variable pressure type between the soil body and the metal interface of any one of claims 1-3 is adopted to carry out the electroosmosis test, and comprises the following steps:
step 1: the device is fixed on a drawing test device, and the stepping transformation device (4) and the electroosmosis cathode (3) of each partition are connected with the positive pole and the negative pole of three external power supplies with different voltages, so that the circuits are ensured to be communicated;
Step 2: applying normal pressure to the device, and when the device is in contact extrusion with a soil body, the electroosmosis anodes (2) and the base I (8) at the central positions of the partitions deform to enable the conductive rods (6) to move downwards and connect voltages of different gears according to different sizes of compression deformation;
and step 3: when the device is completely contacted with the soil body, standing for t min to keep an electroosmosis state;
And 4, step 4: and (5) after standing for t min, applying normal tension to the device, pulling the device out of the soil body, and ending electroosmosis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910799042.9A CN110568019A (en) | 2019-08-26 | 2019-08-26 | partition electroosmosis viscosity reduction test device and test method for stepping and pressure changing between soil body and metal interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910799042.9A CN110568019A (en) | 2019-08-26 | 2019-08-26 | partition electroosmosis viscosity reduction test device and test method for stepping and pressure changing between soil body and metal interface |
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| CN110568019A true CN110568019A (en) | 2019-12-13 |
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| CN201910799042.9A Withdrawn CN110568019A (en) | 2019-08-26 | 2019-08-26 | partition electroosmosis viscosity reduction test device and test method for stepping and pressure changing between soil body and metal interface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397337A (en) * | 2022-01-29 | 2022-04-26 | 江苏徐工工程机械研究院有限公司 | Soil adhesion force testing device and method |
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2019
- 2019-08-26 CN CN201910799042.9A patent/CN110568019A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397337A (en) * | 2022-01-29 | 2022-04-26 | 江苏徐工工程机械研究院有限公司 | Soil adhesion force testing device and method |
| CN114397337B (en) * | 2022-01-29 | 2023-11-07 | 江苏徐工工程机械研究院有限公司 | Soil adhesion testing device and method |
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Application publication date: 20191213 |
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