CN109459364B - Test device and method for reinforcing calcareous coarse-grained soil based on MICP - Google Patents
Test device and method for reinforcing calcareous coarse-grained soil based on MICP Download PDFInfo
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- CN109459364B CN109459364B CN201811276445.7A CN201811276445A CN109459364B CN 109459364 B CN109459364 B CN 109459364B CN 201811276445 A CN201811276445 A CN 201811276445A CN 109459364 B CN109459364 B CN 109459364B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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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
- 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
Abstract
The invention discloses a test device for reinforcing calcareous coarse-grained soil based on MICP, which comprises a sample preparation device, a permeability coefficient measuring device and an unconfined compressive strength test device. Meanwhile, a specific test method is also disclosed, which comprises the steps of preparing a sample, and measuring the permeability coefficient and the calcium carbonate content of the sample in sequence. The invention provides a set of test device and method aiming at the characteristics of large particle size, large pore and calcareous coarse-grained soil, is easy to operate and reasonable in arrangement, can be used for researching the physical and mechanical properties of MICP cemented calcareous coarse-grained soil, and lays a foundation for the popularization of MICP technology to the field of calcareous coarse-grained soil.
Description
Technical Field
The invention relates to a test device and a test method for reinforcing calcareous coarse-grained soil based on MICP, and belongs to the field of soil body reinforcement.
Background
The solidification of soil by microbial cementing is a novel soil reinforcing mode which is formed in recent years. The technology utilizes urease generated by metabolism of microorganisms to decompose urea to generate carbonate ions, and the carbonate ions are combined with calcium ions in the environment to form calcium carbonate crystals with a cementing effect, so that the basic mechanical properties of soil are improved. The current microorganism induced calcium carbonate deposition (MICP) technology makes great progress in the field of sandy soil and silty soil with good permeability, has good scour resistance and soil body strength, and can meet certain engineering requirements. The test device and the test process are relatively complete in a laboratory, and the concerned indexes such as strength, permeability, calcium carbonate content and the like are also determined by a relatively complete research means. In the field of calcareous coarse-grained soil (the grain size range of the calcareous coarse-grained soil is generally 5-20mm), the conventional test device and test process are not suitable due to the characteristics of large grains, large pores and calcareous.
Disclosure of Invention
In order to solve the technical problems, the invention provides a test device and a test method for reinforcing calcareous coarse-grained soil based on MICP.
In order to achieve the purpose, the invention adopts the technical scheme that:
a test device for reinforcing calcareous coarse-grained soil based on MICP comprises a sample preparation device; the sample preparation device comprises a container frame, a sample preparation container and a sample taking sheet;
the inner wall of the sample preparation container is attached to a sample taking sheet which is rolled into the shape of the inner wall of the sample preparation container, the top end of the sample taking sheet extends out of an opening of the sample preparation container, the bottom of the sample preparation container is connected with a plurality of liquid drainage channels, and the liquid drainage channels are connected with a liquid drainage control device; a support part is arranged on the side wall of the sample preparation container, and the sample preparation container is supported on the container frame through the support part.
The sample preparation device further comprises a partition plate, the shape of the partition plate is matched with the inner cavity of the sample preparation container, a through hole is formed in the partition plate, and the partition plate is placed at the bottom of the inner cavity of the sample preparation container.
The bottom of the clapboard is provided with a support leg.
The test device also comprises a permeability coefficient measuring device, wherein the permeability coefficient measuring device comprises a constant head adjusting container, a drainage container, a first water receiving container and a second water receiving container;
the end parts of the side walls of the constant head adjusting container and the drainage container are both provided with drainage holes, the drainage holes of the constant head adjusting container are communicated with the first water receiving container, and the drainage holes of the drainage container are communicated with the second water receiving container;
when the permeability coefficient is measured, the sample preparation container is supported at the opening of the drainage container through the supporting part, and the top end of the sample preparation container is in watertight connection with the bottom end of the constant water head adjusting container.
The supporting part is a baffle;
the container frame is provided with a placing hole, when the sample preparation container is supported on the container frame, the bottom end of the sample preparation container is embedded into the placing hole, and the baffle is supported at the opening of the placing hole;
when the sample preparation container is supported at the opening of the drainage container, the bottom end of the sample preparation container is embedded into the drainage container, and the baffle is supported at the opening of the drainage container.
A test method for reinforcing calcareous coarse-grained soil based on MICP comprises sample preparation and comprises the following specific processes:
installing a sample preparation device;
adding the treated calcareous coarse-grained soil into a sampling container;
the soaking treatment comprises the following steps:
1) soaking in a viscous bacterial solution: closing the liquid discharge control device, adding the viscous bacterial solution into the sample preparation container until the coarse calcareous soil is submerged, standing for a period of time, opening the liquid discharge control device, and discharging the viscous bacterial solution;
2) soaking in a treatment solution: closing the liquid discharge control device, adding the treatment liquid into the sample preparation container until the calcareous coarse-grained soil is submerged, standing for a period of time, opening the liquid discharge control device, and discharging and recovering the treatment liquid; the treatment liquid is a mixed solution containing calcium ions and urea;
3) and (3) when the soaking times of the treatment solution reach the preset times, detecting whether the concentration of calcium ions in the recovered treatment solution is lower than a preset threshold value, if so, finishing the preparation of the sample, otherwise, turning to the step 1.
Also comprises the measurement of permeability coefficient, which comprises the following specific processes,
installing a permeability coefficient measuring device;
adding water into the constant head adjusting container, and adjusting the flow rate to enable the sample to reach constant head seepage;
after the seepage is stable, a second water receiving container is used for receiving water and timing, and the water receiving is stopped after the water receiving exceeds a set time threshold;
calculating the flow Q according to the water quality and the timing time in the second water receiving container;
calculating a water head difference H: if the water level can not reach the height of the drain hole of the constant head adjusting container, measuring the height difference between the seepage stabilizing water level and the drain hole of the drain container as a water head difference H; if the water level can reach the height of the drain hole of the constant head adjusting container, measuring the height difference between the drain hole of the constant head adjusting container and the drain hole of the drain container as a water head difference H;
taking out a sample wrapping the sample sheet, measuring the height L and the diameter D of the sample, and calculating to obtain the area A of the section of the sample;
calculating the permeability coefficient
Also comprises the measurement of the calcium carbonate content, the concrete process is,
drying the main body of the sample and the falling particles in the sampling process together, and weighing the mass m2；
Cutting a sample taking piece to enable two ends of the sample taking piece to respectively protrude out of the end part of the corresponding sample main body by a plurality of centimeters;
setting gypsum at two ends of the sample main body and leveling;
carrying out unconfined compressive strength test on the leveled sample main body;
after the test is finished, the plaster and the adhered part are removed, and the residual mass m of the sample main body is weighed3；
Crushing the rest of the sample, soaking in deionized water for several hours, taking out, and drying to obtain m3Effective mass m in4；
According to the formula of proportion
Is calculated to obtain
m5Is m2Effective mass of (1); to obtain the calcium carbonate content
m1The quality of the calcareous coarse-grained soil is put into a sample preparation container when a sample is prepared.
The invention achieves the following beneficial effects: the invention provides a set of test device and method aiming at the characteristics of large particle size, large pore and calcareous coarse-grained soil, is easy to operate and reasonable in arrangement, can be used for researching the physical and mechanical properties of MICP cemented calcareous coarse-grained soil, and lays a foundation for the popularization of MICP technology to the field of calcareous coarse-grained soil.
Drawings
FIG. 1 is a schematic view of a sample preparation apparatus;
FIG. 2 is a schematic view of a container rack;
FIG. 3 is a schematic view of the construction of a permeability coefficient measuring apparatus;
fig. 4 is a schematic view of flattening of a sample body.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
A test device for reinforcing calcareous coarse-grained soil based on MICP comprises a sample preparation device, a permeability coefficient measuring device and an unconfined compressive strength test device.
As shown in fig. 1, the sample preparation apparatus includes a container rack 12, a sample preparation container 1, a partition plate 8, and a sample taking piece 7; the inner wall of system appearance container 1 pastes with the sample piece 7 of getting of 1 inner wall shape of batching system appearance container and leans on, the top of getting sample piece 7 stretches out 1 opening of system appearance container, the shape and the 1 inner chamber matching of system appearance container of baffle 8, it has through-hole 10 to open on the baffle 8, baffle 8 is placed in 1 inner chamber bottom of system appearance container, baffle 8 bottom is provided with stabilizer blade 9, separate baffle 8 and 1 bottom of system appearance container, the bottom of system appearance container 1 sets up a plurality of outage 11, outage 11 is connected with the flowing back passageway, the flowing back passageway is connected with flowing back controlling means, be equipped with supporting part 3 on the lateral wall of system appearance container 1, system appearance container 1 supports on container frame 12 through supporting part 3.
The sampling container 1 adopts an organic glass cylinder, the specific inner diameter is determined according to actual requirements, when the inner diameter of the sampling container 1 is less than 10cm, the maximum particle size of the calcareous coarse-grained soil is allowed to be 1/10 of the inner diameter of the sampling container 1, when the inner diameter of the sampling container 1 is more than 10cm, the maximum particle size of the calcareous coarse-grained soil is allowed to be 1/5 of the inner diameter of the sampling container 1, the wall thickness of the sampling container 1 is not less than 5mm, and the inner height is not less than 2.5 times of the inner diameter.
The number of the liquid discharge holes 11 is not less than four, and the aperture of each liquid discharge hole 11 is not more than the minimum particle size of the calcareous coarse-grained soil.
The liquid drainage channel is a transparent plastic hard pipe 4 connected with the liquid drainage hole 11, the length is 5-10cm, the diameter is matched with the aperture of the liquid drainage hole 11, and the transparent plastic hard pipe 4 is cut into an inclined section of 45 degrees so as to be convenient for connecting the liquid drainage control device.
The liquid discharge control device comprises a transparent plastic hose 5 and a switch 6 arranged on the transparent plastic hose, wherein the transparent plastic hose 5 is connected with a transparent plastic hard tube 4, and the structure of the liquid discharge control device is similar to that of a liquid dropping control device for hanging water in a hospital.
The supporting part 3 is a baffle plate, the sample preparation container 1 passes through the baffle plate and is fixed with the baffle plate, the baffle plate is positioned at the bottom 1/3 of the sample preparation container 1, the baffle plate is a square plate, and the thickness of the baffle plate is not less than 5 mm.
As shown in fig. 2, the container rack 12 is a rack body provided with a placing hole 13, and is specifically a test tube rack structure, the aperture of the placing hole 13 is larger than the outer diameter of the sample preparation container 1 by 1-2 cm, when the sample preparation container 1 is supported on the container rack 12, the placing hole 13 is embedded in the bottom end of the sample preparation container 1, and the baffle 3 is supported at the opening of the placing hole 13.
Baffle 8 is transparent plectane, and thickness is 3 ~ 5mm, and through-hole 10 aperture is not more than the minimum particle diameter of calcareous coarse-grained soil, and through-hole 10 is full whole baffle 8, and stabilizer blade 9 is provided with threely, and stabilizer blade 9 arris length is greater than 11 apertures of outage, constitutes the tripod structure with three stabilizer blade 9 and baffle 8.
The sample sheet 7 is a plastic transparent and smooth paper sheet which is convenient to curl and cut, the length of the sample sheet 7 is not less than 1.5 times of the inner perimeter of the sample preparation container 1, the width is not less than 1.5 times of the height of the sample preparation container 1, the thickness is not more than 1mm, the sample sheet is used for wrapping the sample 2, and the sample 2 is convenient to take out and the permeability coefficient is convenient to measure.
As shown in fig. 3, the permeability coefficient measuring apparatus includes a constant head adjusting tank 14, a drain tank 18, a first water receiving tank 20, and a second water receiving tank 21. The end parts of the side walls of the constant head adjusting container 14 and the drainage container 18 are both provided with drainage holes, the drainage holes of the constant head adjusting container 14 are communicated with a first water receiving container 20 through a water pipe 17, and the drainage holes of the drainage container 18 are communicated with a second water receiving container 21 through the water pipe 17; when the permeability coefficient is measured, the sample preparation container 1 is supported at the opening of the drainage container 18 through the supporting part 3, namely, the bottom end of the sample preparation container 1 is embedded into the drainage container 18, the baffle plate 3 is supported at the opening of the drainage container 18, and the top end of the sample preparation container 1 is in watertight connection with the bottom end of the constant water head adjusting container 14.
The constant head adjusting container 14 is a circular tube with the inner and outer diameters being the same as that of the sample preparation container 1, a drain hole of the constant head adjusting container 14 is formed in a position 3-5 cm away from the top, the aperture is not smaller than the maximum particle size of the calcareous coarse-grained soil 1, and the bottom end of the constant head adjusting container 14 and the top end of the sample preparation container 1 are tightly wrapped through a rubber film 15, so that the water tightness is ensured.
The drainage container 18 is a cylindrical container, the diameter of the drainage container is larger than the outer diameter of the sample preparation container 1 but smaller than the diagonal distance of the baffle 3, the sample preparation container 1 can be placed on the top of the drainage container 18 through the baffle 3, the height of the drainage container 18 is larger than the distance from the baffle 3 to the lower end of the transparent plastic hard tube 4, a drainage hole of the drainage container 18 is formed in the position 1-2 cm away from the top, and the hole diameter is not smaller than the maximum particle diameter of the calcareous coarse-grained soil 1.
The first water receiving container 20 and the second water receiving container 21 are used for receiving drained water, and the specific volume is determined according to the test requirement.
The unconfined compressive strength testing device is a common testing instrument and is not described any more.
A test method for reinforcing calcareous coarse-grained soil based on MICP comprises the steps of preparing a sample 2, and measuring the permeability coefficient and the calcium carbonate content of the sample 2 in sequence.
A1) the sample preparation device was installed.
The sample preparation container 1, the liquid drainage channel and the liquid drainage control device are connected into a whole and supported on the container frame 12, the drainage and the water tightness of the integrated device are checked, after the check is qualified, a layer of vaseline is coated on the inner wall of the sample preparation container 1, the sample preparation piece 7 is rolled into the shape of the inner wall of the sample preparation container 1 and is inserted into the sample preparation container 1, the sample preparation piece 7 is attached to the inner wall of the sample preparation container 1, the partition plate 8 is placed at the bottom of the inner cavity of the sample preparation container 1, and the position of the support leg 9 is adjusted to prevent the liquid drainage hole 11 from being blocked.
A2) The treated calcareous coarse-grained soil 2 is added into a sampling container 1.
The treatment process is as follows: and washing and airing the coarse calcareous soil, picking out shells after airing so that the content of the shells meets the design requirement, and then drying the coarse calcareous soil 2 in a drying oven at 60 ℃ for not less than 6 hours.
The processed mass is m1The calcareous coarse-grained soil is slowly added into the sample preparation container 1, whether the partition plate 8 is balanced or not needs to be noticed at the initial adding stage, and proper leveling needs to be carried out in the adding process, so that the phenomenon of large hollowness is prevented.
A3) The soaking treatment comprises the following steps:
1) soaking in a viscous bacterial solution: adding a thickening agent into the cultured bacterial solution, uniformly stirring to obtain a viscous bacterial solution with the permeability coefficient of 0.03-0.05 cm/s, closing a liquid discharge control device, adding the viscous bacterial solution into the sample preparation container 1 until the thick calcareous soil is submerged, standing for a period of time (generally 30-60 minutes), opening the liquid discharge control device, and discharging the viscous bacterial solution until no viscous bacterial solution is retained.
2) Soaking in a treatment solution: the liquid discharge control device is closed, a mixed solution (hereinafter referred to as a treatment solution) containing calcium ions and urea is added into the sample preparation container 1 until the coarse calcareous soil is submerged, and after standing for a period of time, the liquid discharge control device is opened, and the treatment solution is discharged and recovered.
3) And (3) soaking the treatment solution for multiple times, detecting whether the concentration of calcium ions in the recovered treatment solution is lower than a preset threshold value when the soaking times of the treatment solution reach the preset times, wherein the threshold value is set to be 75% of the concentration of the calcium ions in the treatment solution, if the concentration of the calcium ions is lower than the preset threshold value, the preparation of the sample 2 is finished, and otherwise, the step 1 is carried out.
The specific process of permeability coefficient measurement is as follows:
B1) and installing a permeability coefficient measuring device.
The drainage control device is removed, the sample preparation container 1 is supported at the opening of the drainage container 18 through the supporting part 3, the top end of the sample preparation container 1 is in watertight connection with the bottom end of the constant head adjusting container 14, the drainage hole of the constant head adjusting container 14 is communicated with the first water receiving container 20 through the water pipe 17, and the drainage hole of the drainage container 18 is communicated with the second water receiving container 21 through the water pipe 17.
B2) Water is added to the constant head adjusting tank 14 to adjust the flow rate so that the sample 2 reaches the constant head seepage flow.
B3) After the seepage is stable, the second water receiving container 21 is used for receiving water and timing, and the water receiving is stopped after the water receiving exceeds a set time threshold (generally 30 s).
B4) And calculating the flow Q according to the water quality in the second water receiving container 21 and the timing time.
B5) Calculating a water head difference H: if the water level can not reach the height of the drain hole of the constant head adjusting container 14, measuring the height difference between the seepage stable water level and the drain hole of the drain container 18 as a water head difference H; if the water level can reach the height of the drain hole of the constant head adjusting container 14, the redundant water flows out through the drain hole, so that the water level is kept at the height of the drain hole, and the height difference between the drain hole of the constant head adjusting container 14 and the drain hole of the drain container 18 is measured to be used as the water head difference H.
B6) Taking out the sample 2 wrapped by the sample sheet 7, measuring the height L and the diameter D of the sample 2, and calculating to obtain the section area A of the sample 2;
B7) calculating the permeability coefficient
The specific process of measuring the calcium carbonate content is as follows:
C1) putting the main body of the sample 2 and the particles falling in the sampling process into a 60 ℃ drying oven for drying for 24h, and weighing the mass m2。
C2) And cutting the sample taking piece 7, so that two ends of the sample taking piece 7 respectively protrude out of the end part of the main body of the corresponding sample 2 by a plurality of centimeters, and the length of the sample taking piece is generally 1-2 cm.
C3) Set gypsum at both ends of the body of sample 2 and level it.
As shown in FIG. 4, in order to secure the stability of the main body of the sample 2, the sample piece 7 is wrapped with a rubber band 19, and gypsum 16 is set and leveled at both ends of the main body of the sample 2. The gypsum 16 has the hardness of not less than 5MPa, the initial setting time of not less than 5 minutes and the final setting time of not more than 20 minutes.
C4) The flattened body of sample 2 was subjected to an unconfined compressive strength test.
To avoid mass damage, the bulk of sample 2 was placed in a clear plastic bag for unconfined compressive strength testing.
C5) After the test was completed, the plaster and the adhered portion were removed, and the remaining mass m of the main body of sample 2 was weighed3；
C6) Crushing the rest of sample 2, soaking in deionized water for several hours (generally 12 hours), taking out, and drying to obtain m3Effective mass m in4(i.e., the sum of the calcium carbonate precipitate and the calcareous coarse-grained soil mass).
C7) According to the formula of proportion
Is calculated to obtain
m5Is m2Effective mass in (1).
C8) To obtain the calcium carbonate content
m1To prepare sample 2, the mass of the calcareous coarse-grained soil in the sample preparation vessel 1 was measured.
The invention provides a set of test device and method aiming at the characteristics of large particle size, large pore and calcareous coarse-grained soil, is easy to operate and reasonable in arrangement, can be used for researching the physical and mechanical properties of MICP cemented calcareous coarse-grained soil, and lays a foundation for the popularization of MICP technology to the field of calcareous coarse-grained soil.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a test device based on MICP consolidates calcareous coarse-grained soil which characterized in that: comprises a sample preparation device and a permeability coefficient measuring device;
the sample preparation device comprises a container frame, a sample preparation container and a sample taking sheet;
the inner wall of the sample preparation container is attached to a sample taking sheet which is rolled into the shape of the inner wall of the sample preparation container, the top end of the sample taking sheet extends out of an opening of the sample preparation container, the bottom of the sample preparation container is connected with a plurality of liquid drainage channels, and the liquid drainage channels are connected with a liquid drainage control device; a support part on the side wall of the sample preparation container, wherein the sample preparation container is supported on the container frame through the support part;
the permeability coefficient measuring device comprises a constant head adjusting container, a drainage container, a first water receiving container and a second water receiving container;
the end parts of the side walls of the constant head adjusting container and the drainage container are both provided with drainage holes, the drainage holes of the constant head adjusting container are communicated with the first water receiving container, and the drainage holes of the drainage container are communicated with the second water receiving container;
when the permeability coefficient is measured, the sample preparation container is supported at the opening of the drainage container through the supporting part, and the top end of the sample preparation container is in watertight connection with the bottom end of the constant water head adjusting container.
2. The MICP-based test device for reinforcing calcareous coarse-grained soil according to claim 1, which is characterized in that: the sample preparation device further comprises a partition plate, the shape of the partition plate is matched with the inner cavity of the sample preparation container, a through hole is formed in the partition plate, and the partition plate is placed at the bottom of the inner cavity of the sample preparation container.
3. The MICP-based test device for reinforcing calcareous coarse-grained soil according to claim 1, which is characterized in that: the bottom of the clapboard is provided with a support leg.
4. The MICP-based test device for reinforcing calcareous coarse-grained soil according to claim 1, which is characterized in that: the supporting part is a baffle;
the container frame is provided with a placing hole, when the sample preparation container is supported on the container frame, the bottom end of the sample preparation container is embedded into the placing hole, and the baffle is supported at the opening of the placing hole;
when the sample preparation container is supported at the opening of the drainage container, the bottom end of the sample preparation container is embedded into the drainage container, and the baffle is supported at the opening of the drainage container.
5. The method for testing the device for reinforcing the calcareous coarse-grained soil based on the MICP as claimed in any one of claims 1 to 4, which is characterized in that: the method comprises the following steps of sample preparation:
installing a sample preparation device;
adding the treated calcareous coarse-grained soil into a sampling container;
the soaking treatment comprises the following steps:
1) soaking in a viscous bacterial solution: closing the liquid discharge control device, adding the viscous bacterial solution into the sample preparation container until the coarse calcareous soil is submerged, standing for a period of time, opening the liquid discharge control device, and discharging the viscous bacterial solution;
2) soaking in a treatment solution: closing the liquid discharge control device, adding the treatment liquid into the sample preparation container until the calcareous coarse-grained soil is submerged, standing for a period of time, opening the liquid discharge control device, and discharging and recovering the treatment liquid; the treatment liquid is a mixed solution containing calcium ions and urea;
3) and when the soaking times of the treatment solution reach preset times, detecting whether the concentration of calcium ions in the recovered treatment solution is lower than a preset threshold, if so, finishing the preparation of the sample, otherwise, turning to the step 1).
6. The method for reinforcing the test device for calcareous coarse-grained soil based on MICP according to claim 5, characterized in that: also comprises the measurement of permeability coefficient, which comprises the following specific processes,
installing a permeability coefficient measuring device;
adding water into the constant head adjusting container, and adjusting the flow rate to enable the sample to reach constant head seepage;
after the seepage is stable, a second water receiving container is used for receiving water and timing, and the water receiving is stopped after the water receiving exceeds a set time threshold;
calculating the flow Q according to the water quality and the timing time in the second water receiving container;
calculating a water head difference H: if the water level can not reach the height of the drain hole of the constant head adjusting container, measuring the height difference between the seepage stabilizing water level and the drain hole of the drain container as a water head difference H; if the water level can reach the height of the drain hole of the constant head adjusting container, measuring the height difference between the drain hole of the constant head adjusting container and the drain hole of the drain container as a water head difference H;
taking out a sample wrapping the sample sheet, measuring the height L and the diameter D of the sample, and calculating to obtain the area A of the section of the sample;
calculating the permeability coefficient
7. The method for reinforcing the test device for calcareous coarse-grained soil based on MICP according to claim 5, characterized in that: also comprises the measurement of the calcium carbonate content, the concrete process is,
drying the main body of the sample and the falling particles in the sampling process together, and weighing the mass m2；
Cutting a sample taking piece to enable two ends of the sample taking piece to respectively protrude out of the end part of the corresponding sample main body by a plurality of centimeters;
setting gypsum at two ends of the sample main body and leveling;
carrying out unconfined compressive strength test on the leveled sample main body;
end of the testThen, the plaster and the adhered part are removed, and the remaining mass m of the sample main body is weighed3；
Crushing the rest of the sample, soaking in deionized water for several hours, taking out, and drying to obtain m3Effective mass m in4；
According to the formula of proportion
Is calculated to obtain
m5Is m2Effective mass of (1);
to obtain the calcium carbonate content
m1The quality of the calcareous coarse-grained soil is put into a sample preparation container when a sample is prepared.
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| CN111650274A (en) * | 2020-05-28 | 2020-09-11 | 武汉理工大学 | Test device for simulating and evaluating coral reef sand accelerated cementation |
| CN112500010B (en) * | 2020-12-21 | 2021-11-23 | 河南大学 | Method for improving particle size distribution of yellow river silt based on MICP technology |
| CN113295846B (en) * | 2021-05-08 | 2023-08-11 | 合肥工业大学 | Test device and test method for detecting effect of MICP solidified polluted soil |
| CN113310768B (en) * | 2021-06-11 | 2022-08-02 | 中国矿业大学(北京) | Rigid sample preparation mold for preparing microbial sand column sample by soaking method |
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