CN113029816B - Real-time monitoring device and method for polluted soil curing process based on MICP - Google Patents
Real-time monitoring device and method for polluted soil curing process based on MICP Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 42
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- 230000008569 process Effects 0.000 title claims abstract description 25
- 238000012806 monitoring device Methods 0.000 title claims description 8
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 239000011521 glass Substances 0.000 claims abstract description 85
- 238000005452 bending Methods 0.000 claims abstract description 33
- 239000000919 ceramic Substances 0.000 claims abstract description 32
- 244000005700 microbiome Species 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000007711 solidification Methods 0.000 claims abstract description 10
- 230000008023 solidification Effects 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 6
- 230000000813 microbial effect Effects 0.000 claims description 36
- 241000894006 Bacteria Species 0.000 claims description 15
- 230000001580 bacterial effect Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 9
- 238000011161 development Methods 0.000 claims description 8
- 230000018109 developmental process Effects 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 5
- 230000003698 anagen phase Effects 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 11
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 230000012010 growth Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- 229920005372 Plexiglas® Polymers 0.000 description 3
- 230000033558 biomineral tissue development Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013100 final test Methods 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 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
- 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a device and a method for monitoring a polluted soil solidification process in real time based on MICP. The device comprises a curing preparation system and a dynamic monitoring system, wherein the organic glass cylinder is a variable-section circular truncated cone, a porous organic glass plate is arranged in the organic glass cylinder, and the inner cavity of the organic glass cylinder is partitioned to form an upper cavity and a lower cavity; the side wall of the lower part of the organic glass cylinder is provided with a liquid inlet which is connected with a liquid storage tank through a throttle pump; a liquid outlet is formed in the side wall of the upper portion of the organic glass cylinder, two pairs of piezoelectric ceramic bending elements which are arranged up and down are arranged outside the side walls of the two sides of the middle portion of the organic glass cylinder, and the two pairs of piezoelectric ceramic bending elements are connected with a mechanical wave analyzer. The invention can realize the monitoring of the shear wave velocity of the soil sample in the solidification process of the polluted soil, reflect the generation of carbonate induced by microorganisms in the soil sample and the filling degree of the carbonate in gaps of soil particles, and realize the dynamic monitoring of the solidified polluted soil based on MICP.
Description
Technical Field
The invention belongs to the technical field of microbial induction carbonate precipitation and environmental geotechnical engineering, and relates to a device and a method for real-time monitoring of a process of solidifying polluted soil based on MICP.
Background
Soil modification techniques based on microbial induced calcium carbonate precipitation (Microbial induced calcite precipitation, MICP) have attracted considerable attention in the field of geotechnical engineering in recent years. Because of its numerous advantages over conventional physical/chemical soil modification techniques, intensive research into MICP-based soil modification techniques is necessary. However, since the mineralization of microorganisms involves a series of biochemical and ionic chemical reactions, the reaction steps are relatively complex and difficult to control during the curing process. If the real-time monitoring of the curing process of the sample cannot be realized in the mineralization process of the microorganism, the problems of uneven curing of the sample, incomplete or excessive use of cementing liquid, resource waste and the like are easily caused, and the application and development of the MICP technology are hindered to a certain extent.
In the prior art, the monitoring of the process of microorganism-induced carbonate precipitation mainly comprises the steps of extracting liquid in a sample in the MICP reaction process in real time, measuring the conductivity or the PH value of the liquid, reflecting the activity of microorganisms, and deducing the progress of MICP. However, the method can not directly reflect the filling degree of carbonate to soil in the process of microorganism-induced carbonate precipitation, so that the technology is not ideal for monitoring the reaction process of microorganism solidification of soil.
Disclosure of Invention
Technical problems: the invention provides a device and a method for real-time monitoring of a polluted soil curing process based on MICP (micro-biological composite) aiming at the problems that the real-time monitoring of a sample curing process cannot be realized in a microorganism mineralization process, the sample curing is uneven, the microorganism bacterial liquid and cementing liquid are not thoroughly or excessively used, resources are wasted and the like. And measuring the shear wave velocity of the sample by using a mechanical wave analyzer and a piezoelectric ceramic bending element to monitor whether the microbial liquid and the cementing liquid are sufficient or not and the development condition of carbonate generation induced by microorganisms in real time.
In order to achieve the above purpose, the invention adopts the following technical scheme:
1. real-time monitoring device based on MICP solidification contaminated soil process:
the device comprises a solidification preparation system and a dynamic monitoring system, wherein the solidification preparation system mainly comprises an organic glass cover, an organic glass cylinder, a porous organic glass plate, a throttle pump and a liquid storage tank; the dynamic monitoring system comprises a mechanical wave analyzer and a piezoelectric ceramic bending element; the organic glass cylinder is a variable-section truncated cone, an organic glass cover is arranged at the top of the organic glass cylinder, a porous organic glass plate is arranged in the organic glass cylinder, and the inner cavity of the organic glass cylinder is partitioned by the porous organic glass plate to form an upper cavity and a lower cavity; geotextile is placed on the porous organic glass plate, and a sand cushion layer is filled in the lower cavity of the organic glass cylinder below the porous organic glass plate; the side wall of the lower part of the organic glass cylinder is provided with a liquid inlet, the liquid inlet is positioned below the porous organic glass plate, and the liquid inlet is connected with a liquid storage tank through a throttle pump; a liquid outlet is formed in the side wall of the upper portion of the organic glass cylinder, two pairs of piezoelectric ceramic bending elements which are arranged up and down are arranged outside the side walls of the two sides of the middle portion of the organic glass cylinder, and the two pairs of piezoelectric ceramic bending elements are connected with a mechanical wave analyzer.
The porous organic glass plate is provided with a microorganism reinforced sample, and the height of the sample is parallel and level with the lower edge of the liquid outlet.
The liquid storage box is internally provided with prepared cementing liquid and microbial liquid.
And a one-way valve is arranged in the hole of the porous organic glass plate.
The two pairs of piezoelectric ceramic bending elements are respectively arranged at the upper end and the lower end of the outer side wall of the upper cavity of the organic glass cylinder, each pair of piezoelectric ceramic bending elements consists of a horizontal emitting end and a horizontal receiving end, and the horizontal emitting end and the horizontal receiving end are respectively and symmetrically arranged at two sides of the organic glass cylinder.
2. The real-time monitoring method based on the MICP solidified polluted soil comprises the steps of sample preparation and dynamic monitoring, and comprises the following specific steps:
(1) Installing a device;
(2) Uniformly adding the treated sample which needs to be subjected to microorganism reinforcement into an organic glass cylinder;
(3) The cementing liquid and the microbial bacteria liquid in the liquid storage tank are sent into the organic glass cylinder by using the throttle pump, the liquid enters the lower cavity of the organic glass cylinder and then enters the upper cavity of the organic glass cylinder through the holes on the porous organic glass plate, and the parameters of the throttle pump are adjusted according to the permeability coefficient of the sample until the microbial bacteria liquid and the cementing liquid submerge the sample;
(4) The difference value of shear wave velocity measured by two pairs of piezoelectric ceramic bending elements arranged up and down is utilized to monitor whether the microbial bacteria liquid and the cementing liquid are sufficient in real time so as to timely supply the microbial bacteria liquid and the cementing liquid:
(5) And monitoring the development condition of the microbial induced carbonate generation in real time by utilizing the time-varying trend of the shear wave velocity:
A starting stage: the shear wave speed starts to increase along with time, and after the bacterial liquid and the cementing liquid are mixed, the microorganisms grow and propagate in a large amount and induce carbonate to generate, and the pores of soil particles are filled, as shown in a section ① in fig. 5;
Rapid growth phase: the shear wave speed increases rapidly with time at a speed of 15 m/s/h or more, the bacteria liquid and the cementing liquid are sufficiently supplemented, the MICP reaction is rapid, the carbonate is rapidly generated, and the carbonate is filled into the pores of the soil particles, as shown in a section ②;
slow growth phase: the shear wave speed increases slowly with time at a speed of 5-15 m/s per hour, the pores in the soil body decrease, and the MICP reaction decreases, as shown in section ③ in FIG. 5;
Stabilization phase: the shear wave speed changes at a rate of less than or equal to 5m/s per hour for 10 hours, and is considered to be stable, the pores in the soil are filled, the microbial-induced carbonate reaction is stopped, and the cement and microbial fluid replenishment is stopped, as indicated by the interval ④ in fig. 5.
And the liquid storage tank is sequentially added with microbial liquid and cementing liquid.
The (4) is specifically as follows: after a period of time, if the difference between the shear wave speed monitored by the upper pair of piezoelectric ceramic bending elements and the shear wave speed monitored by the lower pair of piezoelectric ceramic bending elements is greater than a preset wave speed difference threshold, the threshold is taken as 10% in the implementation,The microorganism bacterial liquid and cementing liquid at the upper part of the sample in the organic glass cylinder are considered to be insufficient, the pumping rate of the throttle pump is increased, and the microorganism bacterial liquid and the cementing liquid are timely fed to the upper soil body.
According to the invention, the shear wave velocity of the soil sample in the curing process is monitored in real time, so that the generation of carbonate induced by microorganisms in the soil sample and the filling degree of the carbonate in gaps of soil particles are reflected, the preparation and the dynamic monitoring of the progress of the cured sample based on MICP are realized, and the method contributes to the further development of the MICP technology.
Compared with the prior art, the invention has the following beneficial effects:
1. The device adopts the variable cross-section circular truncated cone, so that the water pressure generates inward partial pressure at the cylinder wall, microbial bacteria liquid and cementing liquid can be promoted to be shunted into the soil body, and the side wall leakage effect is reduced, so that the bacteria liquid and the cementing liquid are distributed more uniformly in the soil body. The specific principle is shown in fig. 4.
2. According to the device, whether the microbial bacteria liquid and the cementing liquid are sufficient or not is monitored in real time according to the difference value of shear wave speeds measured by the upper and lower pairs of piezoelectric ceramic bending elements, so that the bacteria liquid and the cementing liquid can be conveniently fed to an upper soil body in time, and the smooth proceeding of the MICP process is ensured.
3. The device of the invention carries out real-time measurement on the shear wave velocity, and monitors the development condition of microorganism-induced carbonate generation in real time by utilizing the time-varying trend of the shear wave velocity.
Drawings
FIG. 1 is one of the general side views of the present invention;
FIG. 2 is a second general side view of the present invention;
FIG. 3 is a top view of the device;
FIG. 4 is a schematic flow path diagram of a microbial fluid and a cementing fluid;
FIG. 5 is a graph of shear wave velocity over time;
FIG. 6 is a graph showing the shear wave velocity test results of example 1;
FIG. 7 is a graph showing the shear wave velocity test results of example 2.
In the figure: 1-mechanical wave analyzer, 2-organic glass cover, 3-sand cushion layer, 4-porous organic glass plate, 5-organic glass cylinder, 6-piezoceramic bending element, 7-throttle pump, 8-liquid storage tank, 9-liquid outlet, 10-liquid inlet and 11-sample.
Detailed Description
The invention will now be described in detail with reference to specific examples which will assist those skilled in the art in further understanding the invention, but which are not intended to be limiting in any way.
As shown in fig. 1, the device comprises a curing preparation system and a dynamic monitoring system, wherein the curing preparation system mainly comprises a plexiglass cover 2, a plexiglass cylinder 5, a porous plexiglass plate 4, a throttle pump 7 and a liquid storage tank 8; the dynamic monitoring system comprises a mechanical wave analyzer 1 and a piezoelectric ceramic bending element 6.
The organic glass cylinder 5 is a variable cross-section truncated cone, the top of the organic glass cylinder 5 is provided with an organic glass cover 2, the bottom of the inside of the organic glass cylinder 5 is provided with a porous organic glass plate 4, the porous organic glass plate 4 separates the inner cavity of the organic glass cylinder 5 to form an upper cavity and a lower cavity, and in specific implementation, the upper cavity is 30cm in height, and the lower cavity is 3cm in height; geotextile is placed on the porous organic glass plate 4, and a sand cushion layer is filled in the lower cavity of the organic glass cylinder 5 below; the thickness of the glass of the concrete organic glass cylinder 5 is 1cm, the inner diameter of the upper opening is 15cm, the inner diameter of the lower opening is 20cm, and the height is 33cm. The upper cavity above the porous organic glass plate 4 is internally provided with a microorganism reinforced sample, and the height of the sample is level with the lower edge of the liquid outlet 9.
The side wall of the lower part of the organic glass cylinder 5 is provided with a liquid inlet with the inner diameter of 1cm, the liquid inlet is positioned below the porous organic glass plate 4, and the liquid inlet is connected with a liquid storage tank 8 through a throttle pump 7; the liquid storage box 8 is internally provided with prepared cementing liquid and microbial liquid, the side wall of the upper part of the organic glass cylinder 5 is provided with a liquid outlet 9 with the inner diameter of 6mm, and the liquid outlet is used for discharging excessive microbial liquid and cementing liquid;
Two pairs of piezoelectric ceramic bending elements 6 which are arranged up and down are arranged outside the side walls of the two sides of the middle part of the organic glass cylinder 5, each pair of piezoelectric ceramic bending elements 6 consists of a horizontal emitting end and a horizontal receiving end, the horizontal emitting end and the horizontal receiving end are respectively and symmetrically arranged on the two sides of the organic glass cylinder 5, the two pairs of piezoelectric ceramic bending elements 6 are respectively positioned at the positions 10cm and 29cm away from the bottom of the base, and the two pairs of piezoelectric ceramic bending elements 6 are connected with the mechanical wave analyzer 1.
The holes of the specific porous organic glass plate 4 are internally provided with one-way valves which only allow the liquid to flow from bottom to top.
And the difference value of the shear wave velocity measured by the mechanical wave analyzer 1 and the upper and lower pairs of piezoelectric ceramic bending elements 6 is used for monitoring whether the microbial liquid and the cementing liquid are sufficient in real time, and the curing process is controlled in real time by using the measured shear wave velocity V s.
In specific implementation, as shown in fig. 4, the organic glass cylinder 5 is a variable-section truncated cone, and the inner wall surface is a variable-section, so that the water pressure generates inward partial pressure at the cylinder wall, and microbial bacteria liquid and cementing liquid can be caused to flow into the soil body, the side wall leakage effect is reduced, and the solidification is enhanced.
The flow paths of the microbial fluid and the cementing fluid are shown in fig. 4, and the sand cushion 3 and the porous organic glass plate 4 have the functions of ensuring that the microbial fluid and the cementing fluid can uniformly permeate into the 11-sample.
Example 1:
(1) Sample preparation and equipment installation
① Sandy silt was placed in the apparatus with a permeability coefficient of 4.2X10 -4 cm/s. The bottom of the device is provided with a sand cushion layer composed of d < 20mm broken stone, and the sand cushion layer and the sample are separated by geotextile.
② And (5) installing a liquid filling pump pipe, a piezoelectric ceramic bending element and a mechanical wave analyzer.
③ Preparing microbial liquid and cementing liquid in advance. The throttled pump was adjusted to a pumping rate of 50ml/min for priming. (first, microorganism bacteria liquid is poured and then cementing liquid is poured.)
(2) Dynamic monitoring of samples
① After the first microbial fluid and cementing fluid infusion was completed, the shear wave velocity of the test specimens was started.
② After a period of time, if the difference between the shear wave speed monitored by the upper pair of piezoelectric ceramic bending elements 6 and the shear wave speed monitored by the lower pair of piezoelectric ceramic bending elements 6 is greater than 10% of the preset wave speed difference thresholdThe microorganism bacterial liquid and cementing liquid at the upper part of the sample in the organic glass cylinder 5 are considered to be insufficient, the pumping rate of the throttle pump 7 is increased, and the microorganism bacterial liquid and the cementing liquid are timely fed into the upper soil body;
③ And monitoring the development condition of the microbial induced carbonate generation in real time by utilizing the time-varying trend of the shear wave velocity: the shear wave speed goes through a starting stage, a rapid growth stage and a slow growth stage, and finally tends to be stable, so that the cementing liquid and the microbial liquid are stopped from being fed.
The final test curve is shown in FIG. 6.
Example 2:
(1) Sample preparation and equipment installation
① The clay sample was placed in the apparatus with a permeability coefficient of 2.1X10 -5 cm/s. The bottom of the device is provided with a sand cushion layer composed of d < 20mm broken stone, and the sand cushion layer and the sample are separated by geotextile.
② And (5) installing a liquid filling pump pipe, a piezoelectric ceramic bending element and a mechanical wave analyzer.
③ Preparing microbial liquid and cementing liquid in advance. The throttled pump pumping rate was adjusted to 60ml/min for priming. (first, microorganism bacteria liquid is poured and then cementing liquid is poured.)
(2) Dynamic monitoring of samples
① After the first microbial fluid and cementing fluid infusion was completed, the shear wave velocity of the test specimens was started.
② After a period of time, if the difference between the shear wave speed monitored by the upper pair of piezoelectric ceramic bending elements 6 and the shear wave speed monitored by the lower pair of piezoelectric ceramic bending elements 6 is greater than 10% of the preset wave speed difference thresholdThe microorganism bacterial liquid and cementing liquid at the upper part of the sample in the organic glass cylinder 5 are considered to be insufficient, the pumping rate of the throttle pump 7 is increased, and the microorganism bacterial liquid and the cementing liquid are timely fed into the upper soil body;
③ And monitoring the development condition of the microbial induced carbonate generation in real time by utilizing the time-varying trend of the shear wave velocity: the shear wave speed goes through a starting stage, a rapid growth stage and a slow growth stage, and finally tends to be stable, so that the cementing liquid and the microbial liquid are stopped from being fed.
The final test curve is shown in FIG. 7.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. Real-time monitoring device based on MICP solidification contaminated soil process, its characterized in that:
The device comprises a solidification preparation system and a dynamic monitoring system, wherein the solidification preparation system mainly comprises an organic glass cover (2), an organic glass cylinder (5), a porous organic glass plate (4), a throttle pump (7) and a liquid storage box (8); the dynamic monitoring system comprises a mechanical wave analyzer (1) and a piezoelectric ceramic bending element (6); the organic glass cylinder (5) is a variable cross-section circular truncated cone, the top of the organic glass cylinder (5) is provided with an organic glass cover (2), the inside of the organic glass cylinder (5) is provided with a porous organic glass plate (4), and the porous organic glass plate (4) separates the inner cavity of the organic glass cylinder (5) to form an upper cavity and a lower cavity; geotextile is placed on the porous organic glass plate (4), and a sand cushion layer is filled in the lower cavity of the organic glass cylinder (5) below; a liquid inlet is formed in the side wall of the lower part of the organic glass cylinder (5), the liquid inlet is positioned below the porous organic glass plate (4), and the liquid inlet is connected with a liquid storage tank (8) through a throttle pump (7); a liquid outlet (9) is formed in the side wall of the upper part of the organic glass cylinder (5), two pairs of piezoelectric ceramic bending elements (6) which are arranged up and down are arranged outside the side walls of the two sides of the middle part of the organic glass cylinder (5), and the two pairs of piezoelectric ceramic bending elements (6) are connected with the mechanical wave analyzer (1).
2. The real-time monitoring device for the process of solidifying contaminated soil based on MICP according to claim 1, wherein: the porous organic glass plate (4) is provided with a microorganism reinforced sample, and the height of the sample is level with the lower edge of the liquid outlet (9).
3. The real-time monitoring device for the process of solidifying contaminated soil based on MICP according to claim 1, wherein: the liquid storage box (8) is internally provided with prepared cementing liquid and microbial liquid.
4. The real-time monitoring device for the process of solidifying contaminated soil based on MICP according to claim 1, wherein: and a one-way valve is arranged in the hole of the porous organic glass plate (4).
5. The real-time monitoring device for the process of solidifying contaminated soil based on MICP according to claim 1, wherein: the two pairs of piezoelectric ceramic bending elements are respectively arranged at the upper end and the lower end of the outer side wall of the upper cavity of the organic glass cylinder (5), each pair of piezoelectric ceramic bending elements (6) consists of a horizontal emitting end and a horizontal receiving end, and the horizontal emitting end and the horizontal receiving end are respectively and symmetrically arranged at two sides of the organic glass cylinder (5).
6. The real-time monitoring method for the MICP-based contaminated soil curing process applied to the device of claim 1 is characterized by comprising the following steps: the method comprises the following specific steps of sample preparation and dynamic monitoring:
(1) Installing a device;
(2) Uniformly adding the treated sample which needs to be subjected to microorganism reinforcement into an organic glass cylinder (5);
(3) The cementing liquid and the microbial liquid in the liquid storage tank (8) are sent into the organic glass cylinder (5) by the throttle pump (7), the liquid enters the lower cavity of the organic glass cylinder (5) and then enters the upper cavity of the organic glass cylinder (5) through the holes on the porous organic glass plate (4), and the parameters of the throttle pump (7) are adjusted according to the permeability coefficient of the sample until the microbial liquid and the cementing liquid submerge the sample;
(4) The difference value of shear wave velocity measured by two pairs of piezoelectric ceramic bending elements (6) which are arranged up and down is utilized to monitor whether the microbial liquid and the cementing liquid are sufficient in real time so as to be timely supplied:
(5) And monitoring the development condition of the microbial induced carbonate generation in real time by utilizing the time-varying trend of the shear wave velocity:
A starting stage: the shear wave speed starts to increase along with time, and after the bacterial liquid and the cementing liquid are mixed, a large amount of microorganisms grow and propagate and induce carbonate to generate so as to fill the pores of soil particles;
rapid growth phase: the shear wave speed is rapidly increased with the time at the speed of more than or equal to 15m/s per hour, the bacteria liquid and the cementing liquid are sufficiently supplemented, the MICP reaction is rapid, the carbonate is rapidly generated, and the carbonate is filled into the pores of the soil particles;
Slow growth phase: the shear wave speed slowly increases along with time at the speed of 5m/s-15m/s per hour, the pores in the soil body are reduced, and the MICP reaction is weakened;
Stabilization phase: the shear wave speed changes at a speed of less than or equal to 5m/s per hour and lasts for 10 hours, then the shear wave is considered to be stable, the pores in the soil body are filled, the reaction of microorganism-induced carbonate is stopped, and the cementing liquid and microorganism bacterial liquid are stopped to be fed.
7. The real-time monitoring method for the process of solidifying contaminated soil based on MICP according to claim 6, wherein the method comprises the steps of: and the liquid storage box (8) is sequentially added with microbial liquid and cementing liquid.
8. The real-time monitoring method for the process of solidifying contaminated soil based on MICP according to claim 6, wherein the method comprises the steps of: the step (4) specifically comprises the following steps: if the difference between the shear wave speed monitored by the upper pair of piezoelectric ceramic bending elements (6) and the shear wave speed monitored by the lower pair of piezoelectric ceramic bending elements (6) is greater than a preset wave speed difference threshold,
The microorganism bacteria liquid and cementing liquid at the upper part of the sample in the organic glass cylinder (5) are considered to be insufficient, the pumping rate of the throttle pump (7) is increased, and the microorganism bacteria liquid and the cementing liquid are timely fed to the upper soil body.
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