CN113702209A - Device and method for measuring reinforcement degree of microorganism reinforced soil body - Google Patents
Device and method for measuring reinforcement degree of microorganism reinforced soil body Download PDFInfo
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- CN113702209A CN113702209A CN202111005018.7A CN202111005018A CN113702209A CN 113702209 A CN113702209 A CN 113702209A CN 202111005018 A CN202111005018 A CN 202111005018A CN 113702209 A CN113702209 A CN 113702209A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The invention discloses a device and a method for measuring the reinforcement degree of a microorganism reinforced soil body, wherein the distance of a moisture-proof sealing box in a measuring device is flexibly adjusted through a telescopic component, the directions of a bending element sensor and a rigid sheet are changed by adjusting a sealing plate with a groove, the device is put into the soil body after the directions and the distances are adjusted, a function signal generator, an oscilloscope and a computer are connected through a lead, the real-time monitoring of the shear wave velocity of the soil body can be realized, the measurement of the shear wave velocity values in the horizontal direction and the vertical direction of the soil body can be realized by adjusting the direction of the sealing plate with the groove, the rigidity characteristic of the soil body is obtained, the reinforcement degree of the soil body is further evaluated in a multi-dimensional manner, and the process of microorganism reaction is indirectly obtained.
Description
Technical Field
The invention relates to the technical field of microorganism reinforced soil, in particular to a microorganism reinforced soil reinforcement degree measuring device and method.
Background
Microbial reinforcement is a novel reinforcement technology in the field of geotechnical engineering, and has the characteristics of small influence on the environment, low disturbance on soil bodies and the like. The working principle is that under the action of urease generated by Microbial bacteria, urea is decomposed into carbonate ions, and the carbonate ions react with salt ions to form carbonate precipitates to bond soil, wherein, due to the availability and the economy of calcium salt, the Microbial induced calcium carbonate precipitation (MICP) is a Microbial soil reinforcement technology which is most widely applied. A large number of indoor geotechnical tests, model tests and field tests show that the MICP technology can effectively improve the mechanical properties of soil bodies, such as strength, rigidity, liquefaction resistance and impermeability, can be used for slope and foundation reinforcement, prevents seepage and leaks to prevent pollutant diffusion, prevents wind and fixes sand, and the whole reinforcement process is completed by bacterial self-reaction, so that the MICP technology has higher environmental friendliness compared with the traditional hydraulic material for reinforcing the soil bodies. Therefore, the microbial reinforcement technology is considered to be one of the most potential research directions in the field of geotechnical engineering in the 21 st century, and the promotion and popularization of the technology have great significance for the disaster prevention and reduction and the sustainable development of the engineering in China.
Microbial consolidation is a slow process, and the degree of consolidation depends on many factors such as bacterial liquid concentration, reaction liquid concentration, ambient temperature, consolidation times, soil characteristics such as gradation, particle size and particle shape, and salt ion species. In an indoor geotechnical test, a technical means for monitoring the microorganism reinforcement reaction process is mainly shear wave velocity measurement. Shear waves can be propagated in the soil body, and the strain range generated by the shear waves belongs to the elastic range, so that the shear waves are very sensitive to the soil body structure.
In the microbial reinforcement process, the calcium carbonate precipitation filling and the cemented soil particles can both have obvious influence on the soil structure, and further the shear wave velocity value can be changed. The bending element sensor is based on a piezoelectric ceramic sensor, and generates shear waves by voltage excitation or generates excitation voltage by sensing the shear waves through fixing one end of the sensor.
In the existing research on microorganism reinforced soil, a bending element sensor is inserted or embedded into the soil and is in direct contact with the soil and reaction liquid to measure the shear wave velocity. Generally, the reaction solution for microbial reinforcement is a high-alkaline solution, the PH value is about 9, so that the high alkalinity can cause serious erosion to the bending element sensor, the service life of the bending element sensor is influenced, and once the sealing performance of the bending element is poor, the shear wave signal can be seriously disturbed.
Disclosure of Invention
Aiming at the defects in the prior art, the device and the method for measuring the reinforcement degree of the microorganism reinforced soil body solve the problem that the bending element sensor is seriously eroded due to the fact that the bending element sensor is inserted or buried into the soil body by the existing soil body reinforcement method or device.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a microorganism consolidates soil body and consolidates degree measuring device includes: the device comprises a transmitting unit, a receiving unit and a telescopic rod structure;
the launching unit is fixedly connected with one end of the telescopic rod structure; the receiving unit is fixedly connected with the other end of the telescopic rod structure; the transmitting unit and the receiving unit each include: the device comprises a moisture-proof sealing box, a bending element sensor, a sealing plate with a groove and a rigid sheet; the sealing plate with the groove is fixed on one side of the moisture-proof sealing box; the rigid sheet is fixedly connected with the sealing plate with the groove and used for sealing the groove hole in the sealing plate with the groove; the bending element sensor is positioned in the moisture-proof sealing box, and one end of the bending element sensor extends into the groove hole to be fixedly connected with the rigid sheet.
Further, the telescopic rod structure comprises: four groups of telescopic assemblies; each group of telescopic assemblies comprises: the telescopic rod and the telescopic adjusting cylinder;
the telescopic adjusting cylinder is fixed on the telescopic rod; both ends of each telescopic rod are respectively and fixedly connected with the transmitting unit and the receiving unit through strong adhesive layers.
The beneficial effects of the above further scheme are: the arrangement directions of the rigid sheets are two, the long sides are vertical and parallel to the horizontal direction, the positions of the rigid sheets and the bending element sensor can be adjusted by different arrangement positions of the grooved sealing plate, and then shear wave velocity values on the horizontal plane and the vertical plane are measured; simultaneously when using, adjust telescopic link length and dampproofing seal box's arrangement position (horizontal arrangement or vertical arrangement) according to actual demand, have higher suitability.
Further, the edge of the grooved sealing plate is provided with a plurality of elastic latches.
Furthermore, a space for embedding the sealing plate with the groove is opened at one side of the moisture-proof sealing box, and a plurality of lock holes are also formed in the space; each lock hole is matched with 1 elastic lock catch; and a sealing thin cushion layer is also arranged in the opening space of the moisture-proof sealing box.
Further, the aspect ratio of the rigid sheet is 2: 1.
a method for measuring the reinforcement degree of a microorganism reinforced soil body comprises the following steps:
s1, reinforcing the soil body by adopting a microorganism reinforcing method to obtain reinforced soil bodies with different degrees;
s2, placing the device in a reinforced soil body, and measuring the reinforcement degree of the reinforced soil body.
Further, the step S2 includes the following sub-steps:
s21, placing the device in a reinforced soil body;
s22, generating a pulse signal through a function signal generator;
s23, receiving the pulse signal through the bending element sensor of the transmitting unit, generating vibration, driving the rigid sheet of the transmitting unit to vibrate, obtaining the shear wave of the transmitting end, and transmitting the shear wave through the soil body;
s24, receiving shear waves transmitted by the soil body through the rigid sheet of the receiving unit, driving the bending element sensor of the receiving unit to vibrate, and generating an electric signal;
s25, acquiring electric signals through an oscilloscope, and calculating to obtain a shear wave velocity value of the soil body based on the propagation distance of shear waves in the soil body;
and S26, obtaining the reinforcement degree of the soil body according to the shear wave velocity value of the soil body.
Further, in step S21, before the device is placed on a reinforced soil body, the slotted sealing plate is adjusted to change the orientations of the rigid sheet and the bending element sensor, so as to measure the shear wave velocity values in different orientations.
The beneficial effects of the above further scheme are: deducing shear modulus on the horizontal plane and the vertical plane through shear wave velocity on the horizontal plane and the vertical plane to obtain soil stiffness characteristics, and further carrying out multi-dimensional evaluation on the soil reinforcement degree; the change of the shear wave velocity value is monitored in real time, so that the process of the microbial reaction can be indirectly obtained, and the reinforcement process is finished when the shear wave velocity value is unchanged.
In conclusion, the beneficial effects of the invention are as follows: the distance of a moisture-proof sealing box in the measuring device is flexibly adjusted through the telescopic assembly, the orientations of the bending element sensor and the rigid sheet are changed by adjusting the sealing plate with the groove, the device is placed in the soil body after the orientation and the distance are adjusted, the device is connected with a function signal generator, an oscilloscope and a computer through a lead, the real-time monitoring of the shear wave speed of the soil body can be realized, the measurement of the shear wave speed values in the horizontal direction and the vertical direction of the soil body can be realized by adjusting the direction of the sealing plate with the groove, the rigidity characteristic of the soil body is obtained, the reinforcement degree of the soil body is further evaluated in a multi-dimensional manner, and the process of microbial reaction is indirectly obtained.
Drawings
FIG. 1 is a system block diagram of a system for measuring reinforcement degree of a microorganism reinforced soil body;
FIG. 2 is a schematic diagram of a functional signal generator;
FIG. 3 is a schematic diagram of an oscilloscope;
FIG. 4 is an exploded view of the measurement device;
FIG. 5 is a schematic view of the construction of one side of the moisture-tight sealed box with a sealing plate having a groove;
FIG. 6 is a schematic view of a grooved seal plate;
FIG. 7 is a flow chart of a method for measuring the reinforcement degree of a microorganism-reinforced soil body;
wherein, 1, a function signal generator; 2. a computer monitor; 3. an oscilloscope; 4. a telescopic rod structure; 5. a measuring device; 6. connecting a lead; 7. a shuttle flying knob; 8. a number key; 9. a function signal generator signal input port; 10. a function signal generator signal output port; 11. function shortcut keys; 12. a power switch; 13. a liquid crystal display screen; 14. a function signal generator base support; 15. an oscilloscope base support; 16. an oscilloscope signal input port; 17. an oscilloscope signal output port; 18. a power key; 19. a data transmission port; 20. a moisture-proof sealing box; 21. a lock hole; 22. sealing the thin cushion layer; 23. a bending element sensor; 24. an electrical lead; 25. elastic lock catches; 26. a sealing plate with a groove; 27. a rigid sheet; 28. a lead wire external lead hole; 29. a strong adhesive layer; 30. a telescopic rod; 31. a telescopic adjusting cylinder.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, a system for measuring reinforcement degree of microorganism reinforced soil body includes: the device comprises a function signal generator 1, a computer display 2, an oscilloscope 3 and a measuring device 5;
as shown in fig. 2, the function signal generator 1 includes: a shuttle knob 7, a number key 8, a function signal generator signal input port 9, a function signal generator signal output port 10, a function shortcut key 11, a power switch 12, a liquid crystal display 13 and a function signal generator base support 14.
The functional signal generator 1 may be implemented to generate trigger waves comprising different waveforms, different frequencies, and different amplitudes.
The computer display 2 is used for displaying the transmitted and collected waveforms of the transmitting unit and the receiving unit.
As shown in fig. 3, the oscilloscope 3 includes: an oscilloscope base support 15, an oscilloscope signal input port 16, an oscilloscope signal output port 17, a power key 18 and a data transmission port 19.
The oscilloscope 3 has two channels and simultaneously receives signals from the signal transmitting unit and the bending element sensor 23; the oscilloscope 3 realizes signal superposition and eliminates noise interference through programming.
As shown in fig. 4, the measuring device 5 includes: a transmitting unit, a receiving unit and a telescopic rod structure 4;
the transmitting unit is fixedly connected with one end of the telescopic rod structure 4; the receiving unit is fixedly connected with the other end of the telescopic rod structure 4; the transmitting unit and the receiving unit each include: a moisture-proof sealing box 20, a bending element sensor 23, a grooved sealing plate 26 and a rigid sheet 27; the grooved sealing plate 26 is fixed on one side of the moisture-proof sealing box 20; the rigid sheet 27 is fixedly connected with the slotted sealing plate 26 and is used for sealing the slotted hole on the slotted sealing plate 26; the bending element sensor 23 is positioned in the moisture-proof sealed box 20, and one end of the bending element sensor extends into the slotted hole to be fixedly connected with the rigid sheet 27.
The telescopic rod structure 4 comprises: four groups of telescopic assemblies; each group of telescopic assemblies comprises: a telescopic rod 30 and a telescopic adjusting cylinder 31;
the telescopic adjusting cylinder 31 is fixed on the telescopic rod 30; both ends of each telescopic rod 30 are respectively fixedly connected with the transmitting unit and the receiving unit through strong adhesive layers 29.
As shown in fig. 5, one side of the moisture-proof sealing box 20 is opened with a space for the sealing plate 26 with a groove to be inserted, and a plurality of locking holes 21 are formed thereon; each lock hole 21 is matched with 1 elastic lock catch 25; a sealing thin cushion layer 22 is also arranged in the opening space of the moisture-proof sealing box 20.
The edges of the slotted seal plate 26 are provided with a plurality of resilient latches 25, as shown in fig. 6.
The rigid lamellae 27 are rectangular with an aspect ratio of 2:1, and the size of the lamellae can vary with the dimensions of the bender. The bending element sensor 23 and the rigid sheet 27 are fixed through 502 glue, the rigid sheet 27 can be placed on the inner wall of a rubber film, a pressure box and other contact soil test elements and is bonded through soft silica gel to ensure sealing, one side of the rigid sheet 27 is in contact with soil, the other side of the rigid sheet 27 is connected with the bending element sensor 23, and generation and receiving of shear waves are completed through the rigid sheet.
As shown in fig. 4, the side of the moisture-proof sealed box 20 buried in the soil body is a circular opening, 4 lock holes 21 are arranged around the opening, correspondingly connected with the elastic lock 25, the opening bonding surface of the moisture-proof sealing box 20 is provided with a sealing thin cushion layer 22, when the grooved sealing plate 26 is covered under the action of the lock catch, the sealing and waterproof functions are achieved, the rigid sheet 27 is tightly adhered to the middle position of the outer side of the grooved sealing plate 26 through soft silica gel, the bending element sensor 23 penetrates through the grooved sealing plate 26 and is tightly adhered to the rigid sheet 27 on the inner side through glue, then the electric lead 24 behind the bending element sensor 23 penetrates through a lead external lead hole 28 on the back side of the moisture-proof sealing box 20 and is respectively connected with the signal output port 10 of the function signal generator 1 and the signal input port 16 of the oscilloscope 3, the moisture-proof sealing boxes 20 arranged in the same direction are oppositely bonded and fixed by four telescopic rods 30 and a strong bonding layer 29 as shown in figure 1 by sealing and covering under the action of the lock holes.
With reference to fig. 1 and 4, according to actual use requirements, the two rigid sheets 27 are horizontally or vertically placed, the distance between the two rigid sheets 27 can be flexibly adjusted through the telescopic adjusting cylinder 31, the directions of the grooved sealing plates 26 with the bending element sensors 23 and the rigid sheets 27 are different, that is, the direction of the placement of the bending element sensors 23 is the direction in which the long sides are perpendicular or parallel to the horizontal direction, the shear wave velocity values on the horizontal plane and the vertical plane can be measured, the shear modulus on the horizontal plane and the vertical plane can be further deduced, the soil stiffness characteristic can be obtained, and the soil reinforcement degree can be further evaluated in a multi-dimensional manner. Meanwhile, the change of the shear wave velocity value is monitored in real time, so that the process of microbial reaction can be indirectly obtained, and the reinforcement process is finished when the shear wave velocity value is unchanged.
As shown in fig. 7, a method for measuring the reinforcement degree of a microorganism reinforced soil body comprises the following steps:
s1, reinforcing the soil body by adopting a microorganism reinforcing method to obtain reinforced soil bodies with different degrees;
s2, placing the device in a reinforced soil body, and measuring the reinforcement degree of the reinforced soil body.
Step S2 includes the following substeps:
s21, placing the device in a reinforced soil body;
s22, generating a pulse signal through the function signal generator 1;
s23, receiving the pulse signal through the bending element sensor 23 of the transmitting unit, generating vibration, driving the rigid sheet 27 of the transmitting unit to vibrate, obtaining the shear wave of the transmitting end, and transmitting through the soil body;
s24, shear waves transmitted by the soil body are received through the rigid sheet 27 of the receiving unit, the bending element sensor 23 of the receiving unit is driven to vibrate, and an electric signal is generated;
s25, acquiring electric signals through the oscilloscope 3, and calculating to obtain a shear wave velocity value of the soil body based on the propagation distance of the shear wave in the soil body;
and S26, obtaining the reinforcement degree of the soil body according to the shear wave velocity value of the soil body.
In step S21, the device is placed in front of the reinforced soil body, and the grooved sealing plate 26 is adjusted to change the orientations of the rigid sheet 27 and the bending element sensor 23 accordingly, so as to measure the shear wave velocity values in different orientations.
When reinforcement is started in the step S1, injecting a bacterial liquid, and after the injection of the bacterial liquid is finished, injecting a reaction liquid;
and measuring the shear wave velocity value every 30min for the first 3 hours from the beginning of injecting the reaction liquid, and measuring the shear wave velocity value every 1 hour until the measured change of the shear wave velocity value is not obvious, so that the reaction reinforcement is finished.
Finally, measuring the shear wave velocity capable of reflecting the soil body reinforcement degree; the shear wave velocity of samples with different reinforcement degrees is different, and the shear wave velocity value can be used as a characterization factor of the reinforcement degree.
Claims (8)
1. The utility model provides a microorganism consolidates soil body and consolidates degree measuring device which characterized in that includes: the device comprises a transmitting unit, a receiving unit and a telescopic rod structure (4);
the transmitting unit is fixedly connected with one end of the telescopic rod structure (4); the receiving unit is fixedly connected with the other end of the telescopic rod structure (4); the transmitting unit and the receiving unit each include: a moisture-proof sealing box (20), a bending element sensor (23), a grooved sealing plate (26) and a rigid sheet (27); the sealing plate (26) with the groove is fixed on one side of the moisture-proof sealing box (20); the rigid sheet (27) is fixedly connected with the slotted sealing plate (26) and is used for sealing the slotted hole in the slotted sealing plate (26); the bending element sensor (23) is positioned in the moisture-proof sealing box (20), and one end of the bending element sensor extends into the slotted hole to be fixedly connected with the rigid sheet (27).
2. The apparatus for measuring the reinforcement degree of a microbiologically reinforced soil body according to claim 1, wherein the telescopic rod structure (4) comprises: four groups of telescopic assemblies; each group of telescopic assemblies comprises: a telescopic rod (30) and a telescopic adjusting cylinder (31);
the telescopic adjusting cylinder (31) is fixed on the telescopic rod (30); both ends of each telescopic rod (30) are respectively and fixedly connected with the transmitting unit and the receiving unit through strong adhesive layers (29).
3. The apparatus for measuring the reinforcement degree of a microorganism-reinforced soil body according to claim 1, wherein the edges of the grooved seal plate (26) are provided with a plurality of elastic locking hooks (25).
4. The apparatus for measuring the reinforcement degree of a microorganism-reinforced soil body according to claim 3, wherein a space for inserting a sealing plate (26) with a groove is opened at one side of the moisture-proof sealing box (20), and a plurality of locking holes (21) are formed thereon; each lock hole (21) is matched with 1 elastic lock catch (25); and a sealing thin cushion layer (22) is also arranged in the opening space of the moisture-proof sealing box (20).
5. The apparatus for measuring the reinforcement degree of a microorganism-reinforced soil body according to claim 1, wherein the rigid sheet (27) has an aspect ratio of 2: 1.
6. a method for measuring the reinforcement degree of a microorganism reinforced soil body is characterized by comprising the following steps:
s1, reinforcing the soil body by adopting a microorganism reinforcing method to obtain a reinforced soil body with different degrees;
s2, placing the device in a reinforced soil body, and measuring the reinforcement degree of the reinforced soil body.
7. The method of claim 6, wherein the step S2 includes the following steps:
s21, placing the device in a reinforced soil body;
s22, generating a pulse signal through a function signal generator (1);
s23, receiving the pulse signal through the bending element sensor (23) of the transmitting unit to generate vibration, driving the rigid sheet (27) of the transmitting unit to vibrate to obtain the shear wave of the transmitting end, and transmitting the shear wave through the soil body;
s24, shear waves transmitted by the soil body are received through the rigid sheet (27) of the receiving unit, and the bending element sensor (23) of the receiving unit is driven to vibrate to generate an electric signal;
s25, acquiring electric signals through an oscilloscope (3), and calculating to obtain a shear wave velocity value of the soil body based on the propagation distance of shear waves in the soil body;
and S26, obtaining the reinforcement degree of the soil body according to the shear wave velocity value of the soil body.
8. The method of claim 7, wherein the apparatus is placed in front of the reinforced soil body in step S21, and the slotted sealing plate (26) is adjusted to change the orientations of the rigid sheet (27) and the bending element sensor (23) accordingly, so as to measure the shear wave velocity values in different orientations.
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| CN113702209B (en) | 2023-06-09 |
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