CN111855353A - MICP solidification calcareous sand cylinder sample preparation appearance - Google Patents
MICP solidification calcareous sand cylinder sample preparation appearance Download PDFInfo
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- CN111855353A CN111855353A CN202010738205.5A CN202010738205A CN111855353A CN 111855353 A CN111855353 A CN 111855353A CN 202010738205 A CN202010738205 A CN 202010738205A CN 111855353 A CN111855353 A CN 111855353A
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- 239000004576 sand Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- 238000007711 solidification Methods 0.000 title claims description 6
- 230000008023 solidification Effects 0.000 title claims description 6
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 title claims 9
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 239000011521 glass Substances 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 33
- 238000003860 storage Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 5
- 229920000742 Cotton Polymers 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000011440 grout Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 238000005056 compaction Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 241000219307 Atriplex rosea Species 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000005464 sample preparation method Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 4
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- 229920000642 polymer Polymers 0.000 abstract 1
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- 239000000463 material Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229910020489 SiO3 Inorganic materials 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
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- 238000003780 insertion Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a MICP (micro-emulsified concrete Polymer) solidified calcareous sand cylindrical sample preparation instrument which comprises a grouting liquid storage vessel, a peristaltic pump, a grouting pipe, a rubber plug, a pipe hoop, a combined plug, an organic glass pipe, a water stop valve, a liquid outlet pipe and a percolate collecting vessel. The sample preparation instrument can meet the use requirements of various grouting methods, including quantitative grouting and non-quantitative grouting. The sample preparation instrument can realize the integration of sample preparation and grouting, realizes the in-situ MICP reinforcement of the cylindrical triaxial sample of the calcareous sand by the undisturbed grouting of the cylindrical calcareous sand sample, has visual whole grouting process and high sample preparation efficiency, and the prepared MICP reinforced calcareous sand unit body sample has strong uniformity.
Description
Technical Field
The invention relates to a sample preparation instrument, in particular to a MICP solidified calcareous sand cylindrical sample preparation instrument.
Background
The south sea west sand in China is rich in calcareous sand seabed, and has the characteristics of irregular shape, low strength, easiness in crushing and the like. At present, modes such as concrete, cement, lime or chemical grouting are commonly adopted in the construction of the south sea west sand island, the seabed foundation is reinforced, however, the traditional cementing materials such as cement and lime can change the pH value of a soil body, so that the soil body is alkaline and forms an erosion environment in a certain range, adverse effects are generated on the surrounding marine ecology, the concrete often fails due to salt erosion, and the later maintenance cost is not small. For chemical grouting materials, in addition toWater glass (Na)2SiO3) Besides, most chemical pulp materials are toxic, and the development direction of ecological island reef construction is seriously deviated. Therefore, the research on the ecological, environment-friendly, economic and efficient novel calcareous sand seabed reinforcing technology has great significance.
The microorganism Induced calcium Carbonate Precipitation (MICP) technology is a common biological Induced mineralization reaction process, can induce mineral Precipitation and cementation particles by utilizing a spontaneous reaction in a microorganism metabolism process so as to solve the problems of foundation sandy soil earthquake liquefaction, slope reinforcement, wind prevention and sand fixation, geotechnical material repair and the like, and has a wide engineering application prospect. The main material component of the calcareous sand is calcium carbonate which is the same as a product of MICP curing reaction, so the microbial curing technology of the calcareous sand has the advantages of ecology, environmental protection and the like.
In order to fully research the dynamic and static characteristics of MICP reinforced calcareous sand, corresponding dynamic and static triaxial tests are usually required to be developed, however, at present, no reports are found about an instrument device capable of realizing integration of sample preparation and in-situ solidification of a triaxial cylindrical sample of the calcareous sand, and corresponding technical research needs to be developed urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the MICP solidified calcareous sand cylindrical sample preparation instrument which not only realizes the visualization of the sample preparation process of the MICP solidified calcareous sand cylindrical sample, but also can realize the integration of sample preparation and in-situ solidification, thereby obviously improving the sample preparation precision and efficiency.
The technical scheme adopted by the invention is as follows:
a MICP solidified calcareous sand cylindrical sample preparation instrument comprises a grouting liquid storage vessel, a peristaltic pump, a grouting pipe, a rubber plug, a pipe hoop, a combined plug, an organic glass pipe, a water stop valve, a liquid outlet pipe and a percolate collecting vessel; the grouting liquid storage vessel is internally provided with grouting liquid;
the grouting pipe is used for connecting the grouting liquid storage vessel and the organic glass pipe; the peristaltic pump is arranged on the grouting pipe and is used for injecting grouting liquid into the organic glass pipe; the organic glass tube is obtained by fixing a bivalve mould through a tube hoop, and the sample is convenient to take out on the premise of not damaging the sample after the calcareous sand cylindrical sample is solidified; two ends of the organic glass tube are opened, the top opening is provided with a rubber plug, and the bottom opening is provided with a combined plug; the grouting pipe penetrates through a hole reserved in the center of the rubber plug and extends into the organic glass pipe, and the outer diameter of the grouting pipe is larger than the aperture of the hole reserved in the center of the rubber plug; the combined plug is obtained by combining a rubber plug and biochemical fiber cotton, the biochemical fiber cotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical fiber cotton and the rubber plug are tightly matched, the biochemical fiber cotton in the combined plug can prevent calcium sand from seeping, a hole for inserting a liquid outlet pipe is formed in the center of the rubber plug, the outer diameter of the liquid outlet pipe is larger than the aperture of the hole in the center of the rubber plug, and the position of the liquid outlet pipe can be fixed by utilizing the elasticity of the combined plug; the water stop valve is arranged on the liquid outlet pipe and used for controlling the water outlet amount and stopping water outlet; the percolate collecting vessel is positioned below the liquid outlet pipe and is used for receiving grouting liquid flowing down from the organic glass pipe.
In the technical scheme, furthermore, the organic glass tube is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is respectively arranged at the positions of 80mm and 100mm and used as the upper limit and the lower limit of the height of the prepared sample. Therefore, the size of a sample manufactured by the MICP solidified calcareous sand cylindrical sample manufacturing instrument meets the specification that the size (D) of a triaxial compression test sample specified in geotechnical test method Standard (2019) is 39.1mm, the height is within the range of 2D-2.5D, the total height of the organic glass tube is 160mm, the 0mm scale mark at the lower part is 20mm away from the bottom end of the glass tube, and the upper end of the organic glass tube is 40mm away from the 100mm scale mark.
Furthermore, the pipe wall of the organic glass pipe is provided with main scale marks with the interval of 20mm and secondary scale marks with the interval of 2mm, so that layering compaction is facilitated, and the specified size of the sample is strictly met.
Furthermore, the end part of the grouting pipe is positioned in the height range of 70-75 mm of the scale mark of the organic glass pipe, so that the situation that slurry cannot permeate into the inside of the calcareous sand sample due to the fact that the insertion depth of the grouting pipe is too shallow is avoided.
Further, the sample preparation method of the sample preparation instrument comprises the following steps: firstly, the calcareous sand with the soil particle size smaller than 20mm is put into an organic glass tube, a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm is formed after layering and compaction, and grouting is carried out by using a peristaltic pump according to related requirements, so that the MICP solidified calcareous sand cylindrical test meeting the standard requirements is obtained.
Furthermore, in the sample preparation process, the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump after one type of grout is injected, wherein the water stop valve is always kept in a closed state during quantitative grouting, the water stop valve is closed after grouting is completed during non-quantitative grouting, and grouting can be replaced or the peristaltic pump can be directly opened after another type of grout injection or the next round of grouting is started only by meeting the specified standing time.
Furthermore, due to the existence of the peristaltic pump and the water stop valve, the use of various grouting methods can be met, including quantitative grouting and non-quantitative grouting. The sample preparation instrument can conveniently control the grouting ending time, and the control method comprises the following steps: for quantitative grouting, only a certain amount of grouting liquid is put into the grouting liquid storage vessel, the peristaltic pump is opened, the water stop valve is closed, and the peristaltic pump is closed after the grouting liquid in the grouting liquid storage vessel is injected; for non-quantitative grouting, only the water stop valve needs to be opened, the grouting liquid to be seeped can stably flow out (when the grouting liquid can flow out at a constant speed, the stable flow out can be regarded as), then grouting is finished, and the water stop valve and the peristaltic pump are closed.
The invention has the beneficial effects that:
the invention can realize the integration of sample preparation and grouting, realizes the in-situ MICP reinforcement of the cylindrical triaxial sample of the calcareous sand by the undisturbed grouting of the cylindrical calcareous sand sample, has high sample preparation efficiency, and has strong uniformity of the prepared MICP reinforced calcareous sand unit body sample. The sample preparation instrument of the MICP solidified calcareous sand cylindrical sample preparation instrument can accurately prepare a triaxial sample in a layering way, and can realize the visualization of sample preparation and grouting of the calcareous sand cylindrical sample because the organic glass tube is transparent. The organic glass tube is a bivalve mold, and the sample is convenient to take out on the premise of not damaging the sample after the calcareous sand cylindrical sample is solidified. The pipe hoop can be tightly fixed the organic glass pipe bivalve mould and adorn the appearance, avoids leaking thick liquid, can open the pipe hoop after the solidification of calcareous sand cylinder sample, opens the organic glass pipe bivalve mould, is convenient for take a sample under the prerequisite that does not harm the sample. The wall of the organic glass tube is also provided with a primary scale and a secondary scale, which is beneficial to layering and compacting during sample preparation and realizes the accurate manufacture of the calcareous sand triaxial sample. The sample preparation instrument can meet the use requirements of various grouting methods, including quantitative grouting and non-quantitative grouting.
Drawings
FIG. 1 is a schematic view of a MICP solidified calcareous sand cylindrical sample preparation instrument;
FIG. 2 is an elevational view (in mm) of a plexiglas tube;
FIG. 3 is a schematic diagram of a rubber stopper (unit: mm);
FIG. 4 is a schematic view of a composite plug (unit: mm);
FIG. 5 is a schematic view of the effluent tube (unit: mm);
fig. 6 is a view of a water stop valve and a sectional view (unit: mm).
In the figure:
1-grouting liquid storage vessel; 2-a peristaltic pump; 3-grouting pipe; 4-rubber stopper; 5, pipe hoop; 6-organic glass tube; 7-a combination plug; 8, a liquid outlet pipe; 9-percolate collecting vessel; 10-water stop valve; 11-a sleeve; 12-piston.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 shows a MICP solidified calcareous sand cylindrical sample preparation instrument of the present invention, which comprises a grouting liquid storage vessel 1, a peristaltic pump 2, a grouting pipe 3, a rubber stopper 4, a pipe hoop 5, an organic glass pipe 6, a combined stopper 7, a drain pipe 8, a percolate collection vessel 9 and a water stop valve 10;
the grouting pipe 3 is used for connecting the grouting liquid storage vessel 1 and the organic glass pipe 6; the peristaltic pump 2 is arranged on the grouting pipe 3 and is used for injecting the grouting liquid 3 into the organic glass pipe 6, and the flowing direction of the grouting liquid 3 is shown as the arrow direction in figure 1; the grouting pipe 3 penetrates through a rubber plug 4 arranged at an opening at the top of the organic glass pipe 6 and extends into the organic glass pipe 6; the organic glass tube 6 is obtained by fixing a bivalve mould through a tube hoop 5, the two ends of the organic glass tube are open, the top opening of the organic glass tube is provided with the rubber plug 4, and the bottom opening of the organic glass tube is provided with the combined plug 7; the grouting pipe 3 penetrates through a hole reserved in the center of the rubber plug 4 and extends into the organic glass pipe 6, and the outer diameter of the grouting pipe 3 is larger than the aperture of the hole reserved in the center of the rubber plug 4; the combined plug 7 is obtained by combining a rubber plug and biochemical cellucotton, the biochemical cellucotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical cellucotton and the rubber plug are tightly matched, a hole for inserting the liquid outlet pipe 8 is formed in the center of the rubber plug, and the outer diameter of the liquid outlet pipe 8 is larger than the aperture of the hole in the center of the rubber plug; the water stop valve 10 is arranged on the liquid outlet pipe 8 and used for controlling the water outlet amount and stopping water outlet; the percolate collecting dish 9 is positioned below the liquid outlet pipe 8 and is used for receiving the grouting liquid 3 flowing down from the organic glass pipe 6.
The organic glass tube 6 is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is respectively arranged at the positions of 80mm and 100mm and used as the upper limit and the lower limit of the height of the prepared sample. As shown in figure 2, the tube wall of the organic glass tube 6 is provided with main scale marks with the interval of 20mm and secondary scale marks with the interval of 2mm, which is beneficial to layering and compacting and strictly meets the specified size of a sample. The end part of the grouting pipe 3 is positioned in the height range of 70 mm-75 mm of the scale mark of the organic glass pipe 6.
The sample preparation method of the sample preparation instrument comprises the following steps: firstly, the calcareous sand with the soil particle diameter smaller than 20mm is put into an organic glass tube 6, a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm is formed after layering and compaction, and grouting is carried out by utilizing a peristaltic pump 2 according to relevant requirements, so that the MICP solidified calcareous sand cylindrical test meeting the standard requirements is obtained.
In the sample preparation process, the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump 2 after one type of grout is injected, wherein the water stop valve 10 is always kept in a closed state during quantitative grouting, the water stop valve 10 is closed after grouting is completed during non-quantitative grouting, and grouting can be replaced or the peristaltic pump 2 is directly opened after another type of grout injection or the next round of grouting is started only by meeting the specified standing time.
If the grouting is quantitative, only a fixed grouting liquid needs to be placed in the grouting liquid storage vessel 1, the peristaltic pump 2 is opened, the water stop valve 10 is closed, and the peristaltic pump 2 is closed after the grouting liquid 3 in the grouting liquid storage vessel 1 is injected; if the slurry is not quantitative, only the peristaltic pump 2 and the water stop valve 10 need to be opened, the slurry seeping out of the liquid outlet pipe 8 can stably flow out, and the water stop valve and the peristaltic pump are closed after the slurry injection is finished.
The rubber stopper 4 at the top of the organic glass tube 6 is a reversed hollow round table with the height of 40mm, the diameter of the upper bottom of 50mm and the diameter of the lower bottom of 39.1mm, the diameter of the middle of the round hole of 5mm is a round hole, as shown in figure 3, the grouting tube 3 with the inner diameter of 3mm and the outer diameter of 9mm is inserted into the round hole of 5mm, and the size can enable the rubber stopper 5 to be tightly attached to the inner wall of the organic glass tube 6 by utilizing the elasticity of the rubber stopper 5, so that the leakage of grout is avoided, and the position of the grouting tube 3 can be.
Fig. 4 shows a specific structure of the combination plug 7. The biochemical fiber cotton on the upper part of the combined plug 7 forms a solid cylinder with the height of 10mm and the diameter of 39.1mm, the rubber plug on the lower part of the combined plug 7 is a circular table with the height of 40mm, the diameter of the upper bottom of 39.1mm and the diameter of the lower bottom of 50mm, a hole of 5mm is arranged in the center, the biochemical fiber cotton in the combined plug 7 can prevent the calcareous sand from leaking but can not prevent the slurry from flowing out, the combined plug 7 can be tightly attached to the inner wall of the organic glass tube 6 by utilizing the elasticity of the combined plug 7, the slurry leakage is avoided, the drain tube 8 with the inner diameter of 3mm and the outer diameter of 9mm is inserted into the circular hole of 5mm, and the position of the drain tube 8 is strictly.
The liquid outlet pipe 8 has an outer diameter of 9mm, an inner diameter of 5mm and a length of 40mm, and a section of 10mm high spiral thread is arranged on the periphery of the lower part of the liquid outlet pipe and used for installing a water stop valve 10, as shown in fig. 5.
The water stop valve 10 is composed of a sleeve 11 and a piston 12, a vertical opening is formed in the upper half portion of the sleeve 11 and is provided with an internal thread, a transverse opening is formed in the lower half portion of the sleeve 11 and is provided with an internal thread, the vertical opening is communicated with the transverse opening, the internal thread of the vertical opening in the sleeve 11 is in threaded connection with the liquid outlet pipe 8, the piston 12 is provided with an external thread, the transverse opening is in threaded fit with the piston 12, and the transverse opening can be completely sealed through rotation of the piston 12; as shown in fig. 6, the inner wall of the sleeve 11 of the water stop valve 10 has 10mm spiral lines from the top end to the bottom so that the sleeve can be fixed on the liquid outlet pipe 8, 9mm lines closely attached to the spiral lines of the piston 12 are arranged below 10mm, the height of the sleeve 11 is 25mm, the outer diameter is 19mm, the inner diameter is 9mm, the hole of the sleeve 11 within 10mm from the top end is a circular hole with the diameter of 9mm, the shape of the hollow hole outside the range is closely closed with the shape of the piston 12, the water outlet amount can be controlled and the water outlet can be closed by rotating the piston 12, and as shown in fig. 6, the water stop valve 10 is closed to prevent slurry leakage during quantitative grouting; during non-quantitative grouting, the water stop valve 10 can be opened during grouting until the grouting liquid 3 in the liquid outlet pipe 8 can stably flow out (when the grouting liquid 3 can flow out at a constant speed, the stable outflow can be seen), that is, the grouting is fully finished by closing the water stop valve 10 and the peristaltic pump 2.
Implementation mode of MICP solidified calcareous sand cylindrical sample preparation instrument
The double-section mold of the glass tube is taken out, the glass tube and the double-section mold are tightly combined into a whole by using the tube hoop 5, and the combined plug 7 is inserted into the lower part of the organic glass tube 6, so that the end part of one end of the biochemical fiber cotton of the combined plug 7 is tightly superposed with the 0 scale mark of the tube wall of the organic glass tube. And screening out the calcareous sand with the soil sample particle size of less than 20mm by using a coarse screen with the aperture of 20mm through a screening method.
And (3) performing layered compaction on the calcareous sand loaded into the organic glass tube 6 by using a compaction hammer according to the standard of geotechnical test method (2019), compacting each layer for 3-4 times to reach the layered design height of 20mm, performing the steps layer by layer until the last layer is reached, inserting the grouting tube 3 sleeved with the rubber plug 4 into the organic glass tube 6, manually controlling the bottom end of the grouting tube 3 to be positioned in the height of 70-75 mm of the scale mark of the wall of the organic glass tube 6, and continuously filling. When the last layer is filled, the sand sample of the layer is placed in the range of upper and lower red scale marks of the MICP solidified calcareous sand cylindrical sample preparation instrument shown in figure 2, then the sample is compacted for 3-4 times until the sample height required by the specification is reached, the filling is completed, then the rubber plug 4 is inserted, the drain pipe 8 is inserted into the combined plug 7, the water stop valve 10 is fixed on the drain pipe 8 by utilizing spiral threads, and the percolate collecting vessel 9 is placed below the drain pipe 8.
The grouting process can be divided into quantitative grouting and non-quantitative grouting: for quantitative grouting, closing a water stop valve 10 on the liquid outlet pipe 8, pouring a specified amount of grouting liquid 3 into the grouting liquid storage vessel 1, opening the peristaltic pump 2 until the grouting liquid 3 in the grouting liquid storage vessel 1 is completely injected, and closing the peristaltic pump 2 after grouting is finished if no other liquid needs to be injected; for non-quantitative grouting, only the peristaltic pump 2 needs to be opened to inject required liquid, the water stop valve 10 is opened, and if grouting liquid 3 seeped out from the water stop valve 10 can stably flow out, namely grouting is finished (when the grouting liquid 3 can flow out at a constant speed, the grouting liquid can be regarded as stable outflow).
After grouting, the grouting pipe 3 is pulled out, the mixture is kept stand for a set time, then the pipe hoop 5 is loosened, the organic glass pipe 6 is opened, the two valves of the cemented MICP solidified sample are taken out, the related instruments of the MICP solidified calcareous sand cylindrical sample preparation instrument are arranged, and the sample is subjected to related dynamic and static triaxial tests.
The above embodiments do not limit the technical solutions of the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (7)
1. A MICP solidified calcareous sand cylindrical sample preparation instrument is characterized by comprising a grouting liquid storage vessel, a peristaltic pump, a grouting pipe, a rubber plug, a pipe hoop, a combined plug, an organic glass pipe, a water stop valve, a liquid outlet pipe and a percolate collecting vessel;
the grouting liquid storage vessel is internally provided with grouting liquid; the grouting pipe is used for connecting the grouting liquid storage vessel and the organic glass pipe; the peristaltic pump is arranged on the grouting pipe and is used for injecting grouting liquid into the organic glass pipe; the organic glass tube is obtained by fixing a bivalve mould through a tube hoop, the two ends of the organic glass tube are open, the top opening of the organic glass tube is provided with a rubber plug, and the bottom opening of the organic glass tube is provided with a combined plug; the grouting pipe penetrates through a hole reserved in the center of the rubber plug and extends into the organic glass pipe, and the outer diameter of the grouting pipe is larger than the aperture of the hole reserved in the center of the rubber plug; the combined plug is obtained by combining a rubber plug and biochemical fiber cotton, the biochemical fiber cotton is a solid cylinder and is positioned at the upper part of the rubber plug, the biochemical fiber cotton and the rubber plug are tightly matched, a hole for inserting a liquid outlet pipe is formed in the center of the rubber plug, and the outer diameter of the liquid outlet pipe is larger than the aperture of the hole in the center of the rubber plug; the water stop valve is arranged on the liquid outlet pipe and used for controlling the water outlet amount and stopping water outlet; the percolate collecting vessel is positioned below the liquid outlet pipe and is used for receiving grouting liquid flowing down from the organic glass pipe.
2. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 1, wherein the organic glass tube is provided with scales, the inner diameter of the organic glass tube is 39.1mm, and a red scale mark is arranged at each of 80mm and 100mm to be used as the upper limit and the lower limit of the height of the prepared sample.
3. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 1, wherein the tube wall of the organic glass tube is provided with main scale lines with the distance of 20mm and secondary scale lines with the distance of 2 mm.
4. The MICP solidified calcareous sand cylinder sample preparation instrument according to claim 1, wherein the end of the grouting pipe is positioned in the height range of 70 mm-75 mm of the calibration line of the organic glass pipe.
5. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 2, wherein the sample preparation method of the sample preparation instrument comprises the following steps: firstly, the calcareous sand with the soil particle size smaller than 20mm is put into an organic glass tube, a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm is formed after layering and compaction, and grouting is carried out by using a peristaltic pump according to related requirements, so that the MICP solidified calcareous sand cylindrical test meeting the standard requirements is obtained.
6. The MICP solidification calcareous sand cylinder sample preparation instrument according to claim 5, wherein in the sample preparation process, the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump after one kind of grout is injected, wherein a water stop valve is always kept in a closed state during quantitative grouting, the water stop valve is closed after grouting is finished during non-quantitative grouting, and grouting can be replaced or the peristaltic pump can be directly opened after the specified standing time is met when another kind of grout is injected or the next round of grouting is started.
7. The MICP solidified calcareous sand cylindrical sample preparation instrument according to claim 6, wherein the grouting end time is controlled by putting quantitative specified grouting liquid into a grouting liquid storage vessel, opening a peristaltic pump to close a water stop valve, and closing the peristaltic pump after the grouting liquid in the grouting liquid storage vessel is injected completely; if the slurry is not quantitative, only the peristaltic pump and the water stop valve need to be opened, the slurry seeping out of the liquid outlet pipe can stably flow out, and the water stop valve and the peristaltic pump are closed after the slurry injection is finished.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112525649A (en) * | 2020-12-28 | 2021-03-19 | 浙江科技学院 | Linkage type liquefiable sandy soil triaxial sample in-situ solidification sample preparation instrument and method |
CN112649263A (en) * | 2020-12-11 | 2021-04-13 | 浙江科技学院 | Cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and sample preparation method |
CN112683630A (en) * | 2021-01-25 | 2021-04-20 | 浙江科技学院 | Calcareous sand hollow cylindrical sample in-situ curing sample preparation instrument and sample preparation method |
US11644394B2 (en) | 2020-12-11 | 2023-05-09 | Zhejiang University Of Science And Technology | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101799386A (en) * | 2009-12-25 | 2010-08-11 | 福州大学 | Testing device and testing method for engineering mechanical properties of falling rock backfill |
CN202126369U (en) * | 2011-06-28 | 2012-01-25 | 宁波大学 | Sample preparation instrument of sand triaxial test |
CN103645287A (en) * | 2013-12-26 | 2014-03-19 | 中国矿业大学(北京) | Device for performing laboratory grouting testing on test block |
CN103837385A (en) * | 2014-02-28 | 2014-06-04 | 河海大学 | Coarse-grained soil polymer slip casting triaxial test sample kit and using method thereof |
CN105716967A (en) * | 2016-02-03 | 2016-06-29 | 山东科技大学 | Grout-rock interface feature test method using induction splitting grouting device |
CN105842430A (en) * | 2016-06-02 | 2016-08-10 | 天津大学 | Test method and test device for transverse microorganism cement grouting |
CN105865874A (en) * | 2016-05-11 | 2016-08-17 | 同济大学 | Sample preparing device suitable for sandy soil laboratory tests |
CN106644625A (en) * | 2016-10-09 | 2017-05-10 | 重庆大学 | Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof |
CN107064472A (en) * | 2017-03-29 | 2017-08-18 | 河海大学 | The experimental rig and test method of a kind of microorganism grouting and reinforcing cylinder sand sample |
CN107255705A (en) * | 2017-07-24 | 2017-10-17 | 河海大学 | Microorganism grouting test device and test method for uniform curing silt |
CN108827770A (en) * | 2018-04-17 | 2018-11-16 | 山东大学 | It is a kind of suitable for the grouting test system of triaxial compression test and its application |
CN109540614A (en) * | 2018-10-26 | 2019-03-29 | 中国地质大学(武汉) | A kind of method and device preparing drift-sand mechanical test test specimen based on microorganism |
CN209311174U (en) * | 2018-11-20 | 2019-08-27 | 武汉港湾工程质量检测有限公司 | For evaluating the drift-sand mechanical test test material preparation device of microorganism consolidation effect |
CN110261202A (en) * | 2019-07-25 | 2019-09-20 | 泉州装备制造研究所 | A kind of grouting sample preparation device |
-
2020
- 2020-07-28 CN CN202010738205.5A patent/CN111855353A/en active Pending
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101799386A (en) * | 2009-12-25 | 2010-08-11 | 福州大学 | Testing device and testing method for engineering mechanical properties of falling rock backfill |
CN202126369U (en) * | 2011-06-28 | 2012-01-25 | 宁波大学 | Sample preparation instrument of sand triaxial test |
CN103645287A (en) * | 2013-12-26 | 2014-03-19 | 中国矿业大学(北京) | Device for performing laboratory grouting testing on test block |
CN103837385A (en) * | 2014-02-28 | 2014-06-04 | 河海大学 | Coarse-grained soil polymer slip casting triaxial test sample kit and using method thereof |
CN105716967A (en) * | 2016-02-03 | 2016-06-29 | 山东科技大学 | Grout-rock interface feature test method using induction splitting grouting device |
CN105865874A (en) * | 2016-05-11 | 2016-08-17 | 同济大学 | Sample preparing device suitable for sandy soil laboratory tests |
CN105842430A (en) * | 2016-06-02 | 2016-08-10 | 天津大学 | Test method and test device for transverse microorganism cement grouting |
CN106644625A (en) * | 2016-10-09 | 2017-05-10 | 重庆大学 | Three-axis test sample preparation device of low-strength microorganism calcareous sand and application method thereof |
CN107064472A (en) * | 2017-03-29 | 2017-08-18 | 河海大学 | The experimental rig and test method of a kind of microorganism grouting and reinforcing cylinder sand sample |
CN107255705A (en) * | 2017-07-24 | 2017-10-17 | 河海大学 | Microorganism grouting test device and test method for uniform curing silt |
CN108827770A (en) * | 2018-04-17 | 2018-11-16 | 山东大学 | It is a kind of suitable for the grouting test system of triaxial compression test and its application |
CN109540614A (en) * | 2018-10-26 | 2019-03-29 | 中国地质大学(武汉) | A kind of method and device preparing drift-sand mechanical test test specimen based on microorganism |
CN209311174U (en) * | 2018-11-20 | 2019-08-27 | 武汉港湾工程质量检测有限公司 | For evaluating the drift-sand mechanical test test material preparation device of microorganism consolidation effect |
CN110261202A (en) * | 2019-07-25 | 2019-09-20 | 泉州装备制造研究所 | A kind of grouting sample preparation device |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112649263A (en) * | 2020-12-11 | 2021-04-13 | 浙江科技学院 | Cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and sample preparation method |
US11644394B2 (en) | 2020-12-11 | 2023-05-09 | Zhejiang University Of Science And Technology | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
CN112525649A (en) * | 2020-12-28 | 2021-03-19 | 浙江科技学院 | Linkage type liquefiable sandy soil triaxial sample in-situ solidification sample preparation instrument and method |
CN112683630A (en) * | 2021-01-25 | 2021-04-20 | 浙江科技学院 | Calcareous sand hollow cylindrical sample in-situ curing sample preparation instrument and sample preparation method |
CN112683630B (en) * | 2021-01-25 | 2024-05-24 | 浙江科技学院 | In-situ solidification sample preparation instrument and sample preparation method for calcareous sand hollow cylindrical sample |
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