CN112683630B - In-situ solidification sample preparation instrument and sample preparation method for calcareous sand hollow cylindrical sample - Google Patents
In-situ solidification sample preparation instrument and sample preparation method for calcareous sand hollow cylindrical sample Download PDFInfo
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- CN112683630B CN112683630B CN202110097891.7A CN202110097891A CN112683630B CN 112683630 B CN112683630 B CN 112683630B CN 202110097891 A CN202110097891 A CN 202110097891A CN 112683630 B CN112683630 B CN 112683630B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000005464 sample preparation method Methods 0.000 title claims abstract description 9
- 239000004576 sand Substances 0.000 title claims description 54
- 238000011065 in-situ storage Methods 0.000 title claims description 17
- 238000007711 solidification Methods 0.000 title claims description 15
- 230000008023 solidification Effects 0.000 title claims description 15
- 239000011521 glass Substances 0.000 claims abstract description 51
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 40
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
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- Sampling And Sample Adjustment (AREA)
Abstract
The sample preparation instrument comprises a first slurry storage vessel, a first grouting pipe, a first peristaltic pump, a first graphite electrode, a waterproof ventilation valve, a rubber plug, a grouting converter, an organic glass pipe, a cylinder assembly, a second graphite electrode, an effusion liquid pipe, a second grouting pipe, a second peristaltic pump, a second slurry storage vessel, an effusion collecting vessel and a direct current power supply; the sample preparation method is realized by adopting a MICP technology and combining a pressure grouting method and an electroosmosis grouting two-stage grouting method, and the sample preparation instrument and the sample preparation method can obviously improve the curing effect of the prepared sample, so that the prepared sample has good integrity.
Description
Technical Field
The invention belongs to the technical field of sample curing of multi-disciplinary intersection such as geotechnical engineering disciplines, chemistry, microorganisms, electron electrics and the like, and relates to a calcareous sand hollow cylinder sample in-situ curing sample preparation instrument and a sample preparation method.
Background
The Western sand in the south China sea is rich in calcareous sand seabed and has the characteristics of irregular shape, low strength, easiness in breaking and the like. At present, concrete, cement, lime or chemical grouting and other modes are often adopted to strengthen a seabed foundation in the construction of a southwest sand island reef, however, traditional cementing materials such as cement, lime and the like can enable soil bodies to be alkaline and form a certain range of erosion environments, adverse effects are generated on surrounding marine ecology, the concrete is often invalid due to salt erosion, and the later maintenance cost is also not small. For chemical grouting materials, most of chemical grouting materials are toxic except water glass (Na 2SiO3), and the development direction of ecological island construction is seriously deviated. Therefore, the research on the novel ecological environment-friendly, economical and efficient calcareous sand seabed reinforcement technology is significant.
The microorganism-induced calcium carbonate deposition (Microbially Induced Carbonate Precipitation, abbreviated as MICP) technology is a common biological induction mineralization reaction process, and can utilize spontaneous reaction in the microorganism metabolism process to induce mineral substances to precipitate cementation particles so as to solve the problems of earthquake liquefaction of foundation sandy soil, slope reinforcement, wind prevention, sand fixation, rock-soil material restoration and the like, and has wide engineering application prospect. The main substance component of the calcareous sand is calcium carbonate which is the same as the product of the MICP curing reaction, so that the microbial curing technology of the calcareous sand has the advantages of ecology, environmental protection and the like.
In order to fully research the dynamics characteristics of MICP reinforced calcareous sand under wave action, a hollow cylinder torsion shear test for curing the calcareous sand is generally required to be carried out, however, no report is yet made on an instrument device capable of realizing sample preparation and in-situ curing of a hollow cylinder sample of the calcareous sand at present, and corresponding technical research is required to be carried out.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a calcium sand hollow cylindrical sample in-situ curing sample preparation instrument and a sample preparation method thereof, wherein the sample preparation instrument realizes uniform curing of a hollow cylindrical sample by performing pressure grouting firstly and then electroosmosis grouting, namely, the pressure grouting is performed firstly in the initial stage aiming at the characteristics of large sample pore ratio and good permeability, and when the pressure grouting cannot be continuously performed due to the improvement of compactness in the later stage of the curing stage, the electroosmosis grouting is adopted, so that the grouting effect can be remarkably improved, and the integrity and uniformity of the cured sample are better.
The technical scheme adopted for solving the technical problems is as follows:
the in-situ solidification sample preparation instrument for the calcareous sand hollow cylindrical sample comprises a first slurry storage vessel, a first grouting pipe, a first peristaltic pump, a first graphite electrode, a waterproof ventilation valve, a rubber plug, a grouting converter, an organic glass pipe, a cylindrical combination body, a second graphite electrode, an effusion liquid pipe, a second grouting pipe, a second peristaltic pump, a second slurry storage vessel, an effusion collection vessel and a direct current power supply;
The organic glass tube is of a double-valve structure and is fixed by a tube hoop; a rubber plug, a grouting converter and a cylinder assembly are sequentially arranged in the organic glass tube from top to bottom, the cylinder assembly is of an integrated structure formed by coaxially and fixedly connecting an upper small cylinder and a lower large cylinder, wherein the lower large cylinder is provided with a top surface and a bottom surface, and the inside of the lower large cylinder is not communicated with the upper small cylinder; sealing strips are stuck between the contact surfaces of the grouting converter and the organic glass tube, between the grouting converter and the cylinder assembly and between the cylinder assembly and the organic glass tube to prevent sand leakage and slurry leakage, and a circumferential space for placing a calcareous sand sample is formed between the grouting converter and the cylinder assembly in the organic glass tube; the bottom surface of the grouting converter positioned above the annular space and the top surface of the lower large cylinder in the cylinder assembly positioned below the annular space are uniformly provided with a plurality of holes;
the first grouting pipe, the first graphite electrode and the waterproof air-permeable valve are respectively inserted into the grouting converter through rubber plugs; the second graphite electrode, the effusion liquid pipe and the second grouting pipe are respectively inserted into the large cylinder at the lower part of the cylinder assembly from the lower part;
The first grouting pipe is connected with the first slurry storage vessel through a first peristaltic pump, the second grouting pipe is connected with the second slurry storage vessel through a water stop clamp and a second peristaltic pump, the first graphite electrode is connected with the positive electrode of the direct current power supply, and the second graphite electrode is connected with the negative electrode of the direct current power supply; the tail end of the effusion pipe is provided with a detachable pipe plug, and the effusion collecting vessel is arranged below the effusion pipe.
In the above technical scheme, further, the grouting converter is a hollow cylinder, the bottom of the grouting converter is provided with a circular groove coaxial with the cylinder, so that the bottom surface of the cylinder is annular, and a plurality of holes are uniformly formed in the annular bottom surface of the cylinder; the small upper cylinder of the cylinder assembly can be just inserted into the circular groove to realize fixation.
Furthermore, the top of the grouting converter is provided with three round holes which are respectively used for inserting a waterproof ventilation valve, a first graphite electrode and a first grouting pipe, and the wall of each round hole is provided with a sealing belt.
Furthermore, the bottom surface of the grouting converter and the contact part between the top surface of the big cylinder at the lower part of the cylinder assembly and the calcareous sand sample are all provided with the raw chemical fiber cotton.
Further, the rubber plug is provided with three through holes, one of the holes is positioned at the center of the rubber plug, the other two holes are symmetrically distributed at the center of the circle, the hole positioned at the center of the circle is used for inserting a first graphite electrode, the other two holes are respectively used for inserting a first grouting pipe and a waterproof ventilation valve, and the second graphite electrode is also positioned at the axle center of a big cylinder at the lower part of the cylinder assembly.
The in-situ solidification sample preparation method for the calcareous sand hollow cylindrical sample is realized based on the sample preparation instrument, and adopts a two-stage grouting method of pressure grouting and electroosmosis grouting to combine with a MICP technology, and specifically comprises the following steps:
After a calcareous sand soil sample is filled in a sample preparation instrument and the sample preparation instrument is installed, firstly, bacteria liquid is filled in a first slurry storage vessel, a water stop clamp connected with a second grouting pipe is closed to prevent the slurry from passing through, a liquid outlet pipe plug on an effusion liquid outlet pipe is opened, a first peristaltic pump is opened for pressure grouting, the first peristaltic pump is closed after one hour, after standing for two hours, the liquid in the first slurry storage vessel is changed into Ca 2+ gel solution, the first peristaltic pump is opened for grouting for one hour, and then standing for 6 hours; repeating the above processes until the inside of the sample is blocked, grouting cannot be continued, and the exudates in the exudates liquid pipe are difficult to flow out, changing the liquid in the first serosity storage dish into Ca 2+ gel solution, placing bacterial liquid in the second serosity storage dish, opening a water stop clamp connected with the second grouting pipe, blocking the tail end of the exudates liquid pipe by a pipe plug, opening a peristaltic pump I and a peristaltic pump II, opening a direct current power supply to perform electroosmosis grouting, closing the direct current power supply and all peristaltic pumps after 6 hours, and finishing grouting.
Further, the sample preparation instrument is installed as follows: fixing double-flap film of organic glass tube into a whole by pipe hoop, uniformly smearing vaseline on the side surface of cylinder combination body, inserting cylinder combination body from lower end of organic glass tube to make upper small cylinder be positioned above and make bottom surface of lower large cylinder be flush with bottom surface of organic glass tube, filling sample in the annular space formed by cylinder combination body and organic glass tube, concretely: the method comprises the steps of independently preparing dried calcareous sand according to the mass of each layer of required particle size particles, uniformly dividing 5 layers, pouring the calcareous sand into a circular space, slightly stirring the calcareous sand by using stirring strips for each layer to compact sand samples, scraping hair among the layers to ensure uniformity of the samples, inserting a grouting converter from the top of an organic glass tube to tightly contact the top surface of a cylinder assembly after the last layer of calcareous sand is filled, inserting a rubber plug into the organic glass tube to enable the rubber plug to be attached to the grouting converter, adjusting angles to enable the rubber plug to be communicated with an opening on the top surface of the grouting converter, and installing a first graphite electrode, a first grouting tube, a waterproof ventilation valve, a second graphite electrode, a second grouting tube and an seeping liquid outlet tube.
Further, after grouting is completed, the pipe hoop is loosened, after the organic glass pipe and other components are removed, an iron hammer is used for tapping the bottom surface of the cylinder assembly to gradually separate the sample from the cylinder assembly, and the sample is placed into a pressure chamber to perform a hollow cylinder torsion shear test.
The invention has the beneficial effects that:
The sample preparation instrument adopts a pressure and electroosmosis combined mode to perform grouting, the initial sample has large pore ratio and good permeability, the pressure mode grouting can be performed through the pressure mode, and when the sample is gradually compact until the internal blockage cannot continue to perform pressure grouting, the electroosmosis mode is adopted to continue grouting so as to ensure that the sample grouting is uniform, the grouting channel is not blocked due to the compact surface layer, and the phenomenon of nonuniform internal solidification of the sample is caused, thereby remarkably improving the uniformity of the MICP solidified calcareous sand hollow cylindrical sample. The whole process of grouting and sample preparation of the sample preparation instrument is visualized, the pressure grouting is controlled by the peristaltic pump, the electroosmosis grouting is controlled by the direct current power supply, the effusion is controlled by the drain pipe plug, and the whole process is highly controllable. In addition, this system appearance is through setting up waterproof ventilation valve and drain pipe balanced system appearance internal and external atmospheric pressure to avoid influencing the slip casting effect because of the too big pressure of system appearance inside.
Drawings
FIG. 1 is a schematic diagram showing a specific structure of a sample preparation apparatus according to the present invention;
FIG. 2 is a schematic view showing a specific structure (unit: mm) of a rubber stopper;
FIG. 3 is a schematic diagram of a specific construction (unit: mm) of a grouting transformer;
FIG. 4 is a schematic view of a specific structure (unit: mm) of a cylinder assembly;
in fig. 1: a first slurry storage vessel-1, a first slurry injection pipe-2, a first peristaltic pump-3, a first graphite electrode-4, a waterproof ventilation valve-5, a rubber plug-6, a slurry injection converter-7, a pipe hoop-8, an organic glass pipe-9, a cylinder combination body-10, a second graphite electrode-11, a permeate liquid pipe-12, a liquid outlet pipe plug-13, a second slurry injection pipe-14, a second peristaltic pump-15, a second slurry storage vessel-16, a permeate liquid collection vessel-17 and a direct current power supply-18.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to fig. 4, which are specific examples of the calcareous sand hollow cylindrical sample in-situ solidification sample preparation instrument of the present invention, include a slurry storage vessel 1, a slurry injection pipe 2, a peristaltic pump 3, a graphite electrode 4, a waterproof and ventilation valve 5, a rubber plug 6, a slurry injection converter 7, a pipe hoop 8, a organic glass pipe 9, a cylindrical assembly 10, a graphite electrode 11, an effusion pipe 12, a effusion pipe plug 13, a grouting pipe 14, a peristaltic pump 15, a slurry storage vessel 16, an effusion collection vessel 17, and a dc power supply 18;
The first slurry storage vessel 1 stores a gelling solution rich in Ca 2+ and bacterial liquid with anions in sequence in a pressure grouting stage, and stores a gelling solution rich in Ca 2+ in an electroosmosis grouting stage; the first grouting pipe 2 is connected with a first slurry storage vessel and an organic glass pipe 9; the first peristaltic pump 3 is arranged on the first grouting pipe and inputs the slurry in the first slurry storage vessel to the grouting converter 7; the first graphite electrode 4 is connected with the positive electrode of the power supply and is used for attracting bacteria liquid with anions to move when the power is on; the waterproof ventilation valve 5 can balance the internal and external air pressure of the organic glass tube while preventing the slurry from exuding, so that the slurry circulation in the sample can be smoothly carried out; the rubber plug 6 is arranged at the top end of the organic glass tube and is provided with three holes, one is inserted with a first graphite electrode, the other is inserted with a waterproof ventilation valve, and the other is inserted with a first grouting tube; the grouting converter is a cylinder with a bottom at the upper part and a bottom at the lower part, the top of the grouting converter is provided with three holes for inserting a first grouting pipe, a waterproof ventilation valve and a first graphite electrode which pass through a rubber plug, the bottom of the grouting converter is provided with a circular groove coaxial with the grouting converter, the bottom of the grouting converter is annular, the annular bottom is provided with four evenly distributed circular holes, and slurry is injected into a sample from the grouting converter through the four circular holes; the organic glass tube is of a double-valve die structure and is fixed into a whole by the pipe hoop 8; the cylinder assembly 10 is composed of two coaxial cylinders, the diameter of the lower cylinder is 98mm, the diameter of the upper cylinder is 60mm, slurry does not circulate in the upper cylinder, a circumferential space can be formed when the upper cylinder is combined with an organic glass tube, sand samples are placed in the circumferential space to form a hollow cylinder conforming to relevant regulations, the upper cylinder is not communicated with the inner space of the lower cylinder, slurry can circulate in the lower cylinder, 4 evenly distributed round holes are formed in the top of the lower cylinder around the upper cylinder, 3 round holes are formed in the bottom of the lower cylinder, an effusion liquid pipe 12, a second graphite electrode 11 and a second grouting pipe 14 are respectively inserted in the lower cylinder, and in the pressure grouting stage, the exudates in the sample flow out from the exudates liquid pipe through 4 round holes at the top of the lower cylinder of the cylinder combination, and bacterial liquid with anions in the electroosmosis grouting stage is input into the lower cylinder of the cylinder combination through a second grouting pipe and is injected into the sample through 4 round holes at the top of the lower cylinder; the second graphite electrode is connected with the negative electrode of the direct-current power supply and is used for attracting Ca 2+ gel to move when being electrified; the effusion pipe is used for guiding effusion in the sample to an effusion collecting dish in the pressure grouting stage; the liquid outlet pipe plug is used for blocking the liquid outlet pipe when in electroosmosis grouting; the second grouting pipe is used for inputting the bacterial liquid with anions contained in the second slurry storage vessel into the sample in the electroosmosis grouting stage; the direct current power supply is used for supplying power during electroosmosis grouting.
In one embodiment, the first grouting pipe, the second grouting pipe and the liquid outlet pipe are hollow round pipes with inner diameters of 3mm and wall thicknesses of 2 mm.
In one embodiment, the first graphite electrode and the second graphite electrode are cylinders with diameters of 7mm and heights of 50 mm.
In a specific example, the waterproof ventilation valve is a glass tube with an inner diameter of 3mm and a wall thickness of 2mm connected to the bottom of the ventilation valve, and the glass tube is inserted into the grouting converter, so that the internal and external air pressure balance of the instrument is convenient for the smooth flow of the slurry during the sample preparation.
In a specific example, the rubber plug is a member of a truncated cone at the lower part of an upper cylinder, the diameter of the cylindrical part is 150mm, the height is 10mm, the diameter of the upper bottom of the truncated cone is 120mm, the diameter of the lower bottom is 100mm, and the height is 20mm, as shown in fig. 2. The top of the rubber plug is provided with three holes with the diameter of 5mm, one of the holes is positioned at the center of the top surface of the rubber plug, the other two holes are symmetrically distributed at the center of the circle, and the edges of the holes are 20mm away from the center of the circle, wherein the hole at the center of the circle is inserted with a first graphite electrode, and the other two holes are respectively inserted with a first grouting pipe and an organic glass pipe connected with a waterproof ventilation valve.
In one embodiment, the grouting converter is a hollow cylinder with the height of 50mm and the diameter of 98mm, and the bottom of the grouting converter is provided with a circular groove with the depth of 30mm and the diameter of 62mm, which is coaxial with the cylinder, as shown in fig. 3. The grouting converter has three round holes with the diameter of 7mm at the top, and is used for inserting a glass tube connected with a waterproof ventilation valve, a graphite electrode and a grouting tube. And the wall of the circular hole on the top surface of the converter is stuck with a sealing band with the thickness of 1mm so as to enable the inserted electrode and the glass tube to be tightly attached to the wall of the hole. The bottom of the grouting converter is provided with 4 round holes with the aperture of 7mm around the round bottom groove, the distances between the circle centers of the round holes and the outer edge of the grouting converter are 10mm, the circle centers of the four round holes are symmetrically arranged in pairs at the bottom of the grouting converter, and the connecting lines of the two groups of round holes which are mutually symmetrical are mutually orthogonal. The contact parts of the grouting converter and the sample are provided with raw chemical fiber cotton so as to prevent sand samples from leaking out of the holes. And the inner wall of the circular groove at the bottom of the grouting converter is provided with a sealing band with the thickness of 2mm, so that the grouting converter can be tightly attached to the cylinder combination body.
In a specific example, the organic glass tube has an inner diameter of 100mm, a wall thickness of 2mm and a height of 320mm, is of a double-flap die structure, and is convenient to install and detach through a pipe hoop combination.
In a specific example, the lower part of the cylinder assembly is a cylinder with the diameter of 98mm and the height of 50mm, the upper part of the cylinder assembly is a cylinder with the diameter of 60mm and the height of 230mm, the space between the two cylinders is not communicated, four round holes with the diameter of 7mm distributed around the upper cylinder are formed in the top of the lower cylinder, the distances between the circle centers of the round holes and the outer edge of the lower cylinder of the cylinder assembly are 10mm, the circle centers of the four round holes and the top of the two lower cylinders are symmetrically arranged, the connecting lines of the two groups of mutually symmetrical round holes are mutually orthogonal, three round holes with the diameter of 7mm are formed in the bottom of the lower cylinder, the holes at the circle centers are inserted into graphite electrodes, and the other two holes are respectively inserted into an effusion liquid pipe and a second grouting pipe, as shown in fig. 4. The wall of the round hole is stuck with a sealing band with the thickness of 1mm so as to enable the inserted electrode tube and the glass tube to be tightly attached to the wall of the hole. The part of the top surface of the lower cylinder and the bottom surface of the upper cylinder, which are not overlapped, is provided with raw chemical fiber cotton to prevent sand samples from leaking out of the round holes, the side edge of the lower cylinder is provided with a sealing belt with the thickness of 2mm, so that the organic glass tube and the cylinder combination body can be tightly combined, and the upper cylinder part is combined with a round groove at the bottom of the grouting converter to fix the position.
In one embodiment, the second grouting pipe is connected with a section of soft rubber pipe, and a wooden water stop clamp is assembled and disassembled on the rubber pipe part to control whether slurry passes through or not, so that a control valve is formed.
In a specific example, the organic double valve and the cylinder assembly form a space with the outer diameter of 100mm, the inner diameter of 60mm and the height of 200mm for sample preparation, the outer wall of the cylinder assembly is provided with a marking line, and when the calcareous sand sample reaches the marking line, the sample height is just 200mm, so that the sample size meets the sample size specified by the hollow cylinder torsion shear test.
The method for preparing the sample by adopting the calcium sand hollow cylindrical sample in-situ solidification sample preparation instrument is realized by adopting a MICP technology and adopting a pressure grouting and electroosmosis grouting two-stage grouting method, the pressure grouting is firstly carried out, and when the grouting cannot be continued due to the internal blockage of the sample, the direct current power supply is started for electroosmosis grouting.
A specific working process of the embodiment is as follows:
taking out the double-valve mold of the organic glass tube 9, combining the double-valve mold into a whole by utilizing the pipe hoop 8, uniformly smearing vaseline on the side surface of the cylinder assembly 10 and the inner wall of the organic glass tube 9, inserting the cylinder assembly 10 into the lower end of the organic glass tube 9, enabling the cylinder with the smaller diameter to be upwards, enabling the bottom surface of the cylinder with the larger diameter to be flush with the bottom surface of the organic glass tube 9, independently preparing the dried calcareous sand in the annular space of the organic glass tube 9 according to the quality of each layer of particles with the required particle size by matching the grade, uniformly dividing 5 layers, pouring the obtained mixture into a film bearing cylinder, slightly stirring the calcareous sand by using stirring strips for compacting the sand sample every time, and scraping the sand between the layers so as to ensure the uniformity of the sample. After the last layer (i.e. layer 5) of calcareous sand is filled, the height of the sample is just at the marked line of the outer wall of the cylinder assembly 10, and a grouting converter 7 is inserted into the top of the organic glass tube 9 to be in close contact with the top surface of the cylinder assembly 10. The rubber stopper 6 is inserted into the plexiglas tube 9 to attach the rubber stopper 6 to the grouting converter 7, and the angle of the rubber stopper 6 is adjusted so that three holes thereof communicate with three holes at the top of the grouting converter 7. A first graphite electrode 4 is inserted along a round hole at the center of the rubber plug 6, a first grouting pipe 2 and a glass pipe connected with a waterproof ventilation valve 5 are inserted into the other two round holes, and the first grouting pipe and the glass pipe are inserted into a grouting converter 7. A second graphite electrode 11 is inserted along a circular hole at the center of the bottom of the cylinder assembly 10, a second grouting pipe 14 and an effusion pipe 12 are inserted along the other two circular holes, and an effusion collecting dish 17 is arranged below the effusion pipe 12.
Firstly, performing pressure grouting, namely firstly injecting bacterial liquid into a first slurry storage vessel 1, arranging a wood clamp at the rubber pipe part of a second grouting pipe 14 to prevent the slurry from passing through, taking down a liquid outlet pipe plug 13 on a liquid outlet pipe 12, opening a first peristaltic pump 3 to perform pressure grouting for one hour, closing the peristaltic pump, standing for two hours, then replacing the slurry in the first slurry storage vessel 1 with a cementing solution formed by mixing calcium acetate and urea, opening the peristaltic pump to perform grouting for one hour, and standing for 6 hours, and repeating the steps. After the slurry cannot be continuously injected due to the internal blockage of the sample and the exudates in the exudates pipe 12 are difficult to flow out, electroosmosis grouting is carried out, the slurry in the first slurry storage vessel 1 is changed into a gel solution rich in Ca 2+, bacterial liquid with anions is placed in the second slurry storage vessel 16, a wood clamp on the second grouting pipe 14 is taken down, a liquid pipe plug 13 is arranged at the pipe orifice of the exudates pipe 12, the first peristaltic pump 3 and the second peristaltic pump 15 are opened, the direct current power supply 18 is opened for electroosmosis grouting, the direct current power supply 18 and all peristaltic pumps are closed after 6 hours, and grouting is finished.
After grouting, standing for a prescribed time, unfastening the pipe clamp 8, removing the organic glass pipe 9 and other components, tapping the bottom surface of the cylinder assembly 10 by using an iron hammer to gradually separate the sample from the cylinder assembly 10, and placing the sample into a pressure chamber for a hollow cylinder torsion shear test.
The embodiments described in this specification are merely illustrative of the manner in which the inventive concepts may be implemented. The scope of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of the present invention and the equivalents thereof as would occur to one skilled in the art based on the inventive concept.
Claims (7)
1. The in-situ solidification sample preparation method for the calcareous sand hollow cylindrical sample is characterized by comprising a first slurry storage vessel, a first grouting pipe, a first peristaltic pump, a first graphite electrode, a waterproof ventilation valve, a rubber plug, a grouting converter, an organic glass pipe, a cylinder assembly, a second graphite electrode, an effusion pipe, a second grouting pipe, a second peristaltic pump, a second slurry storage vessel, an effusion collection vessel and a direct current power supply;
The organic glass tube is of a double-valve structure and is fixed by a tube hoop; a rubber plug, a grouting converter and a cylinder assembly are sequentially arranged in the organic glass tube from top to bottom, the cylinder assembly is of an integrated structure formed by coaxially and fixedly connecting an upper small cylinder and a lower large cylinder, wherein the lower large cylinder is provided with a top surface and a bottom surface, and the inside of the lower large cylinder is not communicated with the upper small cylinder; sealing belts are arranged between the contact surfaces of the grouting converter and the organic glass tube, between the grouting converter and the cylinder assembly and between the cylinder assembly and the organic glass tube to prevent water and sand leakage, and a circumferential space for placing a calcareous sand sample is formed between the grouting converter and the cylinder assembly in the organic glass tube; the bottom surface of the grouting converter positioned above the annular space and the top surface of the lower large cylinder in the cylinder assembly positioned below the annular space are uniformly provided with a plurality of holes;
the first grouting pipe, the first graphite electrode and the waterproof air-permeable valve are respectively inserted into the grouting converter through rubber plugs; the second graphite electrode, the effusion liquid pipe and the second grouting pipe are respectively inserted into the large cylinder at the lower part of the cylinder assembly from the lower part;
The first grouting pipe is connected with the first slurry storage vessel through a first peristaltic pump, the second grouting pipe is connected with the second slurry storage vessel through a water stop clamp and a second peristaltic pump, the first graphite electrode is connected with the positive electrode of the direct current power supply, and the second graphite electrode is connected with the negative electrode of the direct current power supply; the tail end of the effusion pipe is provided with a detachable effusion pipe plug, and the effusion collecting vessel is arranged below the effusion pipe;
The in-situ solidification sample preparation method for the calcium sand hollow cylindrical sample is based on the sample preparation instrument, and adopts a two-stage grouting method of pressure grouting and electroosmosis grouting to combine with a MICP technology, and specifically comprises the following steps:
After a calcareous sand soil sample is filled in a sample preparation instrument and the sample preparation instrument is installed, firstly, bacteria liquid is filled in a first slurry storage vessel, a water stop clamp connected with a second grouting pipe is closed to prevent the slurry from passing through, a liquid outlet pipe plug on an effusion liquid outlet pipe is opened, a first peristaltic pump is opened for pressure grouting, the first peristaltic pump is closed after one hour, after standing for two hours, the liquid in the first slurry storage vessel is changed into Ca 2+ gel solution, the first peristaltic pump is opened for grouting for one hour, and then standing for 6 hours; repeating the above process until the internal blockage of the sample can not continue grouting and the exudates in the exudates liquid pipe are difficult to flow out, changing the liquid in the first serosity storage dish into Ca 2+ gel solution again, placing bacterial liquid in the second serosity storage dish, opening a water stop clamp connected with the second grouting pipe, plugging the tail end of the exudates liquid pipe by a liquid pipe plug, opening a peristaltic pump and the second peristaltic pump, opening a direct current power supply to carry out electroosmosis grouting, closing the direct current power supply and all peristaltic pumps after 6 hours, and finishing grouting.
2. The method for in-situ solidification sample preparation of a calcareous sand hollow cylinder sample according to claim 1, wherein the grouting converter is a hollow cylinder, the bottom of the grouting converter is provided with a circular groove coaxial with the cylinder so that the bottom surface of the cylinder is annular, and a plurality of holes are uniformly formed in the annular bottom surface of the cylinder; the small upper cylinder of the cylinder assembly can be just inserted into the circular groove to realize fixation.
3. The method for in-situ solidification sample preparation of the calcareous sand hollow cylinder sample according to claim 1, wherein the top of the grouting converter is provided with three round holes for inserting a waterproof ventilation valve, a first graphite electrode and a first grouting pipe, and sealing strips are adhered to the walls of the round holes.
4. The method for in-situ solidification sample preparation of a calcareous sand hollow cylinder sample according to claim 1, wherein the bottom surface of the grouting converter and the contact part between the top surface of the lower large cylinder of the cylinder assembly and the calcareous sand sample are provided with raw chemical fiber cotton.
5. The method for in-situ solidification sample preparation of the calcareous sand hollow cylinder sample according to claim 1, wherein the rubber plug is provided with three through holes, one of the through holes is positioned at the center of the rubber plug, the other two holes are symmetrically distributed at the center of the circle, the hole positioned at the center of the circle is used for inserting a first graphite electrode, the other two holes are respectively used for inserting a first grouting pipe and a waterproof ventilation valve, and the second graphite electrode is also positioned at the axle center of a large cylinder at the lower part of the cylinder assembly.
6. The method for preparing the calcareous sand hollow cylinder sample by in-situ solidification according to claim 1, wherein the installation process of the sample preparation instrument is as follows: fixing double-flap film of organic glass tube into a whole by pipe hoop, uniformly smearing vaseline on the side surface of cylinder combination body, inserting cylinder combination body from lower end of organic glass tube to make upper small cylinder be positioned above and make bottom surface of lower large cylinder be flush with bottom surface of organic glass tube, filling sample in the annular space formed by cylinder combination body and organic glass tube, concretely: the method comprises the steps of independently preparing dried calcareous sand according to the mass of each layer of required particle size particles, uniformly dividing 5 layers, pouring the calcareous sand into a circular space, slightly stirring the calcareous sand by using stirring strips for each layer to compact sand samples, scraping hair among the layers to ensure uniformity of the samples, inserting a grouting converter from the top of an organic glass tube to tightly contact the top surface of a cylinder assembly after the last layer of calcareous sand is filled, inserting a rubber plug into the organic glass tube to enable the rubber plug to be attached to the grouting converter, adjusting angles to enable the rubber plug to be communicated with an opening on the top surface of the grouting converter, and installing a first graphite electrode, a first grouting tube, a waterproof ventilation valve, a second graphite electrode, a second grouting tube and an seeping liquid outlet tube.
7. The method for in-situ solidification and sample preparation of a calcareous sand hollow cylinder sample according to claim 1, wherein after grouting is completed, a pipe hoop is unfastened, an organic glass pipe and other components are removed, a hammer is used for tapping the bottom surface of the cylinder assembly to gradually separate the sample from the cylinder assembly, and the sample is placed in a pressure chamber for a hollow cylinder torsion shear test.
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| CN202110097891.7A CN112683630B (en) | 2021-01-25 | 2021-01-25 | In-situ solidification sample preparation instrument and sample preparation method for calcareous sand hollow cylindrical sample |
| US17/547,424 US11644394B2 (en) | 2020-12-11 | 2021-12-10 | Device and method for preparing solidified cohesionless soil specimen for triaxial test |
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