CN112649263A - Cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and sample preparation method - Google Patents
Cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and sample preparation method Download PDFInfo
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- CN112649263A CN112649263A CN202011464047.5A CN202011464047A CN112649263A CN 112649263 A CN112649263 A CN 112649263A CN 202011464047 A CN202011464047 A CN 202011464047A CN 112649263 A CN112649263 A CN 112649263A
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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
Abstract
The invention discloses a cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and a sample preparation method. The invention adopts a non-disturbance soaking type annular grouting mode to prepare samples. The sample preparation instrument can realize the integration of sample preparation and grouting, can realize the accurate preparation of the calcareous sand three-axis sample by utilizing the scale marks on the inner wall of the organic glass tube, can obviously improve the grouting efficiency by undisturbed grouting of the cylindrical calcareous sand sample, and can prepare the calcareous sand unit body sample with strong uniformity so as to realize the in-situ reinforcement of the calcareous sand cylindrical three-axis sample.
Description
Technical Field
The invention belongs to the technical field of calcium sand solidification crossed by multiple disciplines such as geotechnical engineering discipline, chemistry, biology and the like, relates to a sample preparation instrument and a sample preparation method based on chemical or microbial solidification technology, and particularly relates to a cylindrical sample undisturbed soaking type annular grouting sample preparation instrument and a sample preparation method.
Background
The south sea western sand in China is rich in the calcareous sand seabed, has the characteristics of irregular shape, low strength, easiness in crushing and the like, is easy to liquefy under the action of dynamic loads such as waves and earthquakes, and further influences the safety of structures (structures) in the south sea, so that the research on the in-situ reinforcement of the south sea calcareous sand arouses great interest of researchers, and the research on the reinforcement of the calcareous sand based on chemical grouting (such as organic or inorganic curing agents) or microbial grouting (such as MICP (micro-organic phosphate) grout) is developed.
In order to fully research the dynamic and static characteristics of the solidified 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
The invention provides a cylindrical sample soaking type circumferential grouting sample preparation instrument aiming at the defects of the existing calcareous sand triaxial sample grouting instrument and the undisturbed grouting technology.
The technical scheme adopted by the invention is as follows:
a disturbance-free immersion type circumferential grouting sample preparation instrument for a cylindrical sample is characterized by comprising a grouting liquid storage vessel, an input liquid peristaltic pump, an organic glass tube, a first rubber plug, a grouting tube, an organic glass tube hoop, a second rubber plug, a liquid outlet tube, a backflow tube, a hard cylindrical screening net hoop, a percolate collecting vessel and a backflow liquid peristaltic pump;
the grouting liquid storage vessel is internally provided with grouting liquid;
the organic glass tube is formed by fixing a double-valve mould through an organic glass tube hoop, the two ends of the organic glass tube are provided with openings, the top opening of the organic glass tube is provided with a first rubber plug, and the bottom opening of the organic glass tube is provided with a second rubber plug;
the hard cylindrical screening net is of a double-petal mold structure and is obtained by fixing a hard cylindrical screening net pipe hoop, sieve holes are uniformly distributed on the hard cylindrical screening net, the hard cylindrical screening net is coaxially arranged in the organic glass pipe, and the upper end and the lower end of the hard cylindrical screening net are respectively plugged and fixed by the first rubber plug and the second rubber plug; an annular space is formed between the hard cylindrical screening net and the organic glass tube, the sand sample is arranged in the hard cylindrical screening net, the grouting tube is inserted into the first rubber plug to inject grouting liquid into the annular space from the grouting liquid storage vessel, and the grouting liquid is injected into the soil sample from the middle part of the sieve pores of the hard cylindrical screening net;
a liquid outlet pipe and a backflow pipe are inserted into the second rubber plug, the liquid outlet pipe is used for leading out effluent in the sample to a percolate collecting vessel, and the backflow pipe is used for backflow of liquid in the annular space to a grouting liquid storage vessel;
the input liquid peristaltic pump is arranged on the grouting pipe, and the reflux liquid peristaltic pump is arranged on the reflux pipe; in addition, a section of rubber tube is connected between the tail part of the liquid outlet tube and the return tube, and whether slurry passes through the rubber tube or not is controlled by arranging a water stop clamp on the rubber tube.
In the technical scheme, further, the inner diameter of the organic glass tube is 79.1mm, the inner diameter of the hard cylindrical screening net is 39.1mm, the aperture of a sieve pore on the hard cylindrical screening net is 0.075mm, and the clear distance between every two pores is 1 mm; the surface of the organic glass tube is provided with a graduated scale with the height of at least 100 mm.
Furthermore, the second rubber plug is an integrated plug formed by combining a rubber plug and the filtering fiber cotton, wherein one end of the second rubber plug is provided with two coaxial fine-slit circular grooves, the lower end of the hard cylindrical screening net is embedded into the small fine-slit circular grooves to be fixed, and the width of each small fine-slit circular groove is smaller than the thickness of the cylindrical screening net; the lower end of the organic glass tube is embedded into the large thin slit circular groove for fixing, and the width of the large thin slit circular groove is smaller than the thickness of the organic glass tube; the round bottom surface of the second rubber plug divided by the small slit round groove is adhered with filtering cellucotton to prevent gravel from leaking; the liquid outlet pipe is inserted into the junction of the second rubber plug and the filtering fiber cotton; the reflux pipe is inserted with a second rubber plug and the pipe end is inserted into the annular space.
Furthermore, the rubber plug of the second rubber plug is provided with three holes, one hole is positioned at the circle center of the rubber plug and is used for inserting a liquid outlet pipe, the other two holes are symmetrically distributed at two sides of the circle center of the bottom of the second rubber plug and are both positioned below the annular space and are used for respectively inserting a backflow pipe, and the outer diameter of the backflow pipe is consistent with the outer diameter of the liquid outlet pipe and is larger than the hole diameter of the hole of the second rubber plug.
Furthermore, a rubber buffer one end be equipped with two coaxial slot circles, slot circle on the rubber buffer is unanimous with No. two rubber buffer's slot circle position and size. The upper end of the hard cylindrical screening net is embedded into a small slit circular groove for fixation, and the upper end of the organic glass tube is embedded into a large slit circular groove for fixation; the grouting pipe is inserted into the rubber plug and the pipe end is inserted into the annular space.
Furthermore, two symmetrical holes are formed in the first rubber plug, the first rubber plug is located above the annular space and used for being inserted into a grouting pipe respectively, and the outer diameter of each grouting pipe is larger than the diameter of each hole; or the rubber buffer on be equipped with annular and lead to the groove, the slip casting pipe is the double-layer tube that comprises inner tube, outer tube, and the slip casting pipe inserts annular and leads to the inslot, thereby the slip casting liquid flows in the tube gap that inner tube and outer tube formed and gets into the hoop space, the groove width that the annular led to the groove is less than slip casting tub of outer wall and inner wall interval.
Further, when a rubber buffer, No. two rubber buffers all jam in organic glass intraductal, the lower terminal surface of a rubber buffer and the up end of No. two rubber buffers highly be 100mm just, and the lower terminal surface of a rubber buffer aligns with 100mm scale mark just, and the up end of No. two rubber buffers aligns with 0mm scale mark on the organic glass pipe just.
In addition, the invention also provides a disturbance-free soaking type circumferential grouting sample preparation method for the cylindrical sample, which is realized by adopting the sample preparation instrument and comprises the following steps: firstly opening a rubber plug I, putting gravel with the particle size of 0.075 mm-0.4 mm into a hard cylindrical screening net, layering and compacting to form a cylindrical sample with the diameter of 39.1mm and the height of 80 mm-100 mm, and after a sample preparation instrument is installed, performing disturbance-free annular grouting to obtain a cylindrical sample meeting the requirement; the whole grouting process is controllable, grouting can be stopped by closing the peristaltic pump for input liquid after one type of grout is injected, wherein during grouting, only the water stop clamp of the return pipe is used for clamping the rubber tube in the middle of the return pipe to prevent grout from flowing through, the water stop clamp on the rubber tube at the tail part of the liquid outlet pipe is taken down, the water stop clamp of the liquid outlet pipe is used for clamping the rubber tube at the tail part of the liquid outlet pipe after grouting is finished, the water stop clamp on the return pipe is taken down, the peristaltic pump for reflux liquid is opened, and redundant grout is pumped to a grout storage vessel for next use; and replacing grouting liquid after the specified standing time is met or directly repeating the steps to perform another grouting liquid or the next grouting round.
The grouting end time control method comprises the following steps: and the liquid outlet pipe water stop clamp is clamped on the rubber tube at the tail part of the liquid outlet pipe and the input liquid peristaltic pump is closed after the liquid is blocked and cannot be injected again and the seepage liquid in the liquid outlet pipe can stably flow out, and grouting is finished.
The invention has the beneficial effects that:
the invention can realize the integration of sample preparation and grouting, fully infiltrates the grout along the height range of the sample by using the characteristic that the horizontal permeability coefficient of the calcareous sand is larger than the vertical permeability coefficient through the immersion type annular grouting, so that the prepared unit body sample has stronger uniformity and integrity, the grouting efficiency is obviously improved, and the in-situ reinforcement of the triaxial sample of the calcareous sand cylinder is realized. Because the inner wall of the organic glass tube is provided with the scale marks, the layered compaction during sample preparation is facilitated, and the accurate manufacturing of the calcareous sand triaxial sample is realized. Because the sieve pores of the hard cylindrical sieving net are densely arranged, a sample can be regarded as being soaked in the slurry in the grouting process, the slurry can infiltrate into the calcareous sand sample along the pores of the sieving net when the liquid input peristaltic pump is not started, so that the grouting effect is more sufficient, the slurry is more uniformly distributed in the sample, and in addition, for soil samples which are similar to the calcareous sand and have horizontal permeability coefficients larger than vertical permeability coefficients, the grouting method provided by the invention is adopted, so that the efficiency is higher. By using the reflux peristaltic pump, redundant slurry can be recycled for next use, and the waste of the slurry is avoided. Because the slurry is immersed into the sample in the sieve pores of the screening net, the interference on the sample is smaller than that of the equipment which directly inserts the sample into the sample by using a grouting pipe in the market, and meanwhile, the organic glass pipe and the hard cylindrical screening net are double-section molds, and the sample can be conveniently taken out in a non-disturbance state after the calcareous sand cylindrical sample is solidified, so that the sample can be kept in a highly non-disturbance state in the whole processes of sample preparation, grouting and sampling.
Drawings
FIG. 1 is a schematic view of a non-disturbance soaking type circumferential grouting sample preparation instrument for a calcareous sand cylindrical sample;
FIG. 2 is a schematic view of a double-petal mold of an organic glass tube (unit: mm)
FIG. 3 is a schematic view of a rigid cylindrical screen double split mold (units: mm);
FIG. 4 is a schematic view of a first rubber stopper (unit: mm);
FIG. 5 is a schematic view of a No. two rubber stopper (unit: mm).
In the figure:
1-grouting liquid storage vessel; 2-input liquid peristaltic pump; 3-grouting pipe; 4-a rubber plug; 5-organic glass tube; 6-organic glass pipe hoop; 7-hard cylindrical screening net; 8-hard cylindrical screening net pipe hoop; 9-rubber plug II; 10-a return pipe; 11-a liquid outlet pipe; 12-liquid outlet pipe water stop clip; 13-percolate collecting vessel; 14-return pipe water stop clip; 15-reflux peristaltic pump.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 shows a non-disturbance immersion type circumferential grouting sample preparation instrument for a calcareous sand cylindrical sample, which comprises a grouting liquid storage vessel 1, an input liquid peristaltic pump 2, a grouting pipe 3, a first rubber plug 4, an organic glass pipe 5, an organic glass pipe hoop 6, a hard cylindrical screening net 7, a hard cylindrical screening net hoop 8, a second rubber plug 9, a backflow pipe 10, a liquid outlet pipe 11, a liquid outlet pipe water stop clamp 12, a percolate collecting vessel 13, a backflow pipe water stop clamp 14 and a backflow liquid peristaltic pump 15;
the grouting pipe 3 is used for connecting the grouting liquid storage vessel 1 and the organic glass pipe 5; the device comprises two peristaltic pumps, wherein one peristaltic pump is an input liquid peristaltic pump 2 and is arranged on a grouting pipe 3 and used for injecting grouting liquid into an interlayer between an organic glass pipe 5 and a hard cylindrical screening net 7, the other peristaltic pump is a reflux liquid peristaltic pump 15 and is arranged on a reflux pipe 10, and after grouting is finished, a reflux pipe water stop clamp 14 on the reflux pipe 10 and the reflux liquid peristaltic pump 15 are taken down to recycle redundant grouting liquid into a grouting liquid storage vessel 1 for next use; the direction of the grouting liquid flow is shown as the direction of the arrow in fig. 1; the grouting pipe 3 is inserted into a hole of the first rubber plug 4 at the opening at the top of the organic glass pipe 5 and extends into the bottom of the first rubber plug 4; the organic glass tube 5 adopts a double-petal structure and can be fixed by an organic glass tube hoop 6, both ends of the organic glass tube are in an open form, wherein a first rubber plug 4 is arranged at the top opening, and a second rubber plug 9 is arranged at the bottom opening; the hard cylindrical screening net 7 double-split mold is fixed into a cylinder by a hard cylindrical screening net pipe hoop 8 and is embedded and fixed in position through the slit circular grooves of the first rubber plug 4 and the second rubber plug 9 (see fig. 2 and 3); the outer diameter of the grouting pipe 3 is larger than the aperture of a central preformed hole of the rubber plug 4; the second rubber plug 9 is formed by combining a rubber plug and filter fiber cotton, a hole for inserting the liquid outlet pipe 11 is formed in the center of the second rubber plug 9, holes for inserting the return pipe 10 are formed in two positions, at which the bottom of the second rubber plug 9 is symmetrically distributed in the circle center and the clear distance between the hole edge and the circle center is 27mm, of the bottom of the second rubber plug 9, and the outer diameters of the liquid outlet pipe 11 and the return pipe 10 are larger than the aperture of a round hole in the bottom of the second rubber plug 9; the liquid outlet pipe water stop clamp 12 is arranged on a rubber pipe at the tail part of the liquid outlet pipe 11 and controls whether water is discharged or not by clamping the rubber pipe; the backflow pipe water stop clamp 14 is arranged on a rubber pipe of the backflow pipe 10 and used for clamping the backflow pipe water stop clamp 14 on the middle rubber pipe of the backflow pipe 10 during grouting, and after grouting is completed, the backflow pipe water stop clamp 14 is taken down and the backflow liquid peristaltic pump 15 is opened, so that redundant grout is recycled to the grout storing vessel 1; the percolate collection dish 13 is located directly below the outlet pipe 11 and is used for receiving the slurry seeped from the sample.
The internal diameter of the organic glass tube 5 is 79.1mm, the height is 150mm, the thickness is 3mm, the inner wall of the organic glass tube is provided with scales, and as shown in figure 2, red main scale marks with the interval of 10mm and black secondary scale marks with the interval of 2mm are arranged, so that the organic glass tube is beneficial to layering and compacting and meets the specified size of a sample. The distance between the upper end of the organic glass tube and the upper limit scale mark (100mm position) is 20mm, the distance between the lower end of the organic glass tube and the lower limit scale mark (0mm position) is 30mm, the organic glass tube part without scale marks is used for installing a first rubber plug and a second rubber plug, and the height of a sample prepared by the test piece is ensured to be within the range of 80 mm-100 mm through the scale marks on the inner wall of the glass tube, so that the requirement that the height of a triaxial sample is within the range of 2D-2.5D, which is specified in geotechnical test method standard (2019 edition).
Stereoplasm cylinder screening net 7 is iron screening net, and thick 1mm, internal diameter 39.1mm, and height 150mm, aperture are 0.075mmmm, and clear distance 1mm between each hole, sample diameter 39.1mm that stereoplasm cylinder screening net 7 made, it is controllable at 80mm ~ 100mm within range highly, strictly satisfy sample regulation size.
The sample preparation method of the sample preparation instrument comprises the following steps: firstly, calcium sand with the particle size of 0.075 mm-4 mm is placed into a hard cylindrical screening net, a cylindrical sample with the diameter of 39.1mm and the height of 80 mm-100 mm which can be regulated and controlled is formed after layering and compaction, and grouting is carried out according to the specification requirement by utilizing an input liquid peristaltic pump 2, so that the solidified calcium sand cylindrical sample meeting the relevant requirements is obtained.
In the sample preparation process, the whole grouting process is controllable, and grouting can be stopped by closing the input liquid peristaltic pump 2 after one type of slurry injection is finished.
The grouting end time control method comprises the following steps: wait that the thick liquid that oozes in the drain pipe 10 can stably flow out, and the slip casting thick liquid can't continue the slip casting because of blockking up, then clip 11 afterbody rubber tube of drain pipe and close input liquid peristaltic pump 2 with drain pipe stagnant water clamp 11, slip casting is ended.
Rubber buffer 4 at 6 tops of organic glass pipe is a diameter 95mm, high 30 mm's cylinder, 4 bottom surfaces of rubber buffer have two symmetric distributions on centre of a circle both sides and hole edge distance between circles centre of a circle net distance is 30 mm's diameter and is 5 mm's round hole as shown in figure 4, insert the internal diameter in 5 mm's round hole and be 3mm, the external diameter is 9 mm's slip casting pipe 3, utilize the elasticity of rubber buffer, 5 mm's hole enables rubber buffer 4 and the external diameter closely laminates for 9 mm's 3 outer wall walls of slip casting pipe, thereby the position of strictly fixing slip casting pipe 3 and avoided the hourglass thick liquid, rubber buffer one end is equipped with the deep 20 mm's that the horizontal cross-sectional shape is the same with stereoplasm cylinder screening net 7 and organic glass pipe 5 respectively thin seam circular slot, can make a rubber buffer like can closely laminate with stereoplasm cylinder screening net 7 and organic glass pipe 5.
No. two rubber buffer 9's size and arrangement of slit circular slot are unanimous with rubber buffer 4, and there is three round hole this No. two rubber buffer 9 bottoms, and one of them hole is located No. two rubber buffer 9 bottom surface centre of a circle departments, and this hole does not run through and filters the cellucotton, and remaining two round hole symmetric distribution are at No. two rubber buffer 9 bottom centre of a circle and hole limit clear distance apart from the centre of a circle is 30mm, and all porose external diameters all are 5 mm. As shown in fig. 5, the small circular part divided by the slit circular groove in the second rubber plug 9 is pasted with the filter fiber cotton to prevent the calcareous sand from leaking but not prevent the slurry from leaking, the elasticity of the second rubber plug 9 is utilized, the design enables the second rubber plug 9 to be tightly attached to the inner wall and the outer wall of the organic glass tube 5, the slurry leakage is avoided, the liquid outlet tube 11 and the backflow tube 10 with the inner diameter of 3mm and the outer diameter of 9mm are inserted into the circular hole with the diameter of 5mm, the positions of the liquid outlet tube 11 and the backflow tube 10 can be strictly fixed by utilizing the elasticity of the second rubber plug 9, the cross-sectional dimensions of the liquid outlet tube 11, the backflow tube 10 and the grouting tube 3 are the same (the outer diameter of 9mm and the inner diameter of 3mm), and the middle part of the tail part of the liquid outlet tube 11 and.
And taking down the drain pipe water-stop clamp 12 during grouting, when the percolate can stably flow out, and the grouting liquid cannot continue grouting due to blockage, taking down the backflow liquid water-stop clamp 14 and opening the backflow liquid peristaltic pump 15 after finishing grouting, wherein the drain pipe water-stop clamp 12 clamps the rubber pipe at the tail part of the drain pipe 11, and the excessive grout flows back to the grouting liquid storage vessel 1 for next use.
Implementation mode of non-disturbance soaking type circumferential grouting sample preparation instrument for calcareous sand cylindrical sample
Taking out the hard cylindrical screening net 7 double-section mold, tightly combining the hard cylindrical screening net into a whole by using the hard cylindrical screening net pipe hoop 8, tightly combining the organic glass pipe 5 into a whole by using the organic glass pipe hoop 6, inserting a second rubber plug 9 into the opening at the lower end of the organic glass pipe 5 until the lower end of the organic glass pipe is attached to the bottom of the larger-diameter slit circular groove, so that the top end of the second rubber plug 9 is superposed with 0 scale mark of the pipe wall of the organic glass pipe 5, inserting a liquid outlet pipe 11 into the central hole of the second rubber plug 9 until the junction between the rubber plug and the filtering fiber cotton, inserting two backflow pipes 10 into the holes at two sides of the second rubber plug 9 into the annular space, and embedding the hard cylindrical screening net 7 into the smaller-diameter slit circular groove of the second rubber plug 9 until the bottom of the circular groove so as to fix.
And (3) sieving the calcareous sand by a 5-mesh sieve (with the aperture of 4mm) and a 200-mesh sieve (with the aperture of 0.075mm) to obtain a calcareous sand sample with the particle size of 0.075 mm-4 mm. Compacting the calcareous sand in the hard cylindrical screening net 7 by using a compaction hammer according to 'geotechnical test method standard' (2019), compacting each layer for 3-4 times until the layer reaches the design height (10mm), implementing layer by layer until the design height is reached, inserting the rubber plug 4 with the grouting pipe 3 into the organic glass pipe 5 and the hard cylindrical screening net 7, respectively embedding the hard cylindrical screening net 7 and the organic glass pipe 5 into the fine seam circular groove of the rubber plug 4 to the seam bottom, manually controlling the position of the grouting pipe 3 to enable the grout outlet to be just positioned at the bottom of the rubber plug 4, and completing the filling of the cylindrical calcareous sand triaxial sample. Then, 3 water stop clips are fixed on the rubber tube parts of the liquid outlet tube 11 and the return tube 10, and a percolate collecting dish 13 is placed right below the liquid outlet tube 11 to prepare grouting.
The concrete grouting process is as follows: firstly, taking down the liquid outlet pipe water stop clamp 12, clamping the rubber tube on the return pipe 10 by the return pipe water stop clamp 14 to prevent slurry from flowing through, opening the input liquid peristaltic pump 2 and keeping the return liquid peristaltic pump 15 closed, stopping grouting when the slurry flows out of the liquid outlet pipe 11 continuously and the sieve pores are blocked and the grouting cannot be continued, closing the input liquid peristaltic pump 2 at the moment, clamping the liquid outlet pipe water stop clamp 12 on the rubber tube part at the tail part of the liquid outlet pipe 11, taking down the return pipe water stop clamp 14 and the return liquid peristaltic pump 15, and stopping the return liquid peristaltic pump 15 when all the liquid between the organic glass pipe 5 and the hard cylindrical sieving net 7 is pumped into the slurry injection storage dish 1.
After grouting, the grouting pipe 3 is pulled out, the pipe hoop 6 is loosened after standing for a set time, the organic glass pipe double-section mould 5 and the hard cylindrical screening net double-section mould 7 are opened, a solidified sample after cementation is taken out, the sample is placed in a pressure chamber, and relevant dynamic and static triaxial tests are carried out.
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 (10)
1. A disturbance-free immersion type circumferential grouting sample preparation instrument for a cylindrical sample is characterized by comprising a grouting liquid storage vessel, an input liquid peristaltic pump, an organic glass tube, a first rubber plug, a grouting tube, an organic glass tube hoop, a second rubber plug, a liquid outlet tube, a backflow tube, a hard cylindrical screening net hoop, a percolate collecting vessel and a backflow liquid peristaltic pump;
the grouting liquid storage vessel is internally provided with grouting liquid;
the organic glass tube is formed by fixing a double-valve mould through an organic glass tube hoop, the two ends of the organic glass tube are provided with openings, the top opening of the organic glass tube is provided with a first rubber plug, and the bottom opening of the organic glass tube is provided with a second rubber plug;
the hard cylindrical screening net is of a double-petal mold structure and is obtained by fixing a hard cylindrical screening net pipe hoop, sieve holes are uniformly distributed on the hard cylindrical screening net, the hard cylindrical screening net is coaxially arranged in the organic glass pipe, and the upper end and the lower end of the hard cylindrical screening net are respectively plugged and fixed by the first rubber plug and the second rubber plug; forming an annular space between the hard cylindrical screening net and the organic glass tube, compacting sand samples in the hard cylindrical screening net in a layering manner, inserting the first rubber plug into the grouting tube, injecting the slurry into the annular space from the slurry injection storage vessel, and injecting the slurry into the sand samples from the middle part of the sieve pores of the hard cylindrical screening net;
inserting a liquid outlet pipe and a backflow pipe on the second rubber plug, wherein the liquid outlet pipe is used for leading the sand sample percolate out to a percolate collecting vessel, and the backflow pipe is used for backflow of the liquid in the annular space to a grouting liquid storage vessel;
the input liquid peristaltic pump is arranged on the grouting pipe, and the reflux liquid peristaltic pump is arranged on the reflux pipe; in addition, the tail part of the liquid outlet pipe and the middle of the return pipe are respectively connected with a section of rubber pipe, and the rubber pipe is clamped by a water stop clamp to control the outflow of the slurry.
2. The undisturbed soaking type circumferential grouting sample preparation instrument for the cylindrical sample according to claim 1, wherein the inner diameter of the organic glass tube is 79.1mm, the inner diameter of the hard cylindrical screening net is 39.1mm, the pore diameter of a sieve pore on the hard cylindrical screening net is 0.075mm, and the clear distance between every two pores is 1 mm; the surface of the organic glass tube is provided with a graduated scale with the height of at least 100 mm.
3. The undisturbed soaking type circumferential grouting sample preparation instrument for the cylindrical sample as claimed in claim 2, wherein the second rubber plug is an integrated plug formed by combining a rubber plug and filtering fiber cotton, wherein one end of the second rubber plug is provided with two coaxial fine slit circular grooves, the lower end of the hard cylindrical screening net is embedded into the small fine slit circular groove so as to be fixed, and the width of the small fine slit circular groove is smaller than the thickness of the cylindrical screening net, the lower end of the organic glass tube is embedded into the large fine slit circular groove so as to be fixed, and the width of the large fine slit circular groove is smaller than the thickness of the organic glass tube, and the filtering fiber cotton is attached to the round bottom surface of the second rubber plug divided by the small fine slit circular groove so as to prevent gravel from leaking; the liquid outlet pipe is inserted into the junction of the second rubber plug and the filtering fiber cotton; the reflux pipe is inserted with a second rubber plug and the pipe end is inserted into the annular space.
4. The undisturbed immersion type sample preparation instrument for circumferential grouting of a cylindrical sample according to claim 3, wherein the second rubber plug is provided with three holes, one of the three holes is positioned at the center of the rubber plug and is used for inserting a liquid outlet pipe, the other two holes are symmetrically distributed at two sides of the center of the bottom of the combined plug and are both positioned below the circumferential space and are used for respectively inserting a return pipe, and the outer diameter of the return pipe is consistent with the outer diameter of the liquid outlet pipe and is larger than the hole diameter of the hole in the rubber plug.
5. The undisturbed immersion type circumferential grouting sample preparation instrument for the cylindrical sample according to claim 1, wherein two coaxial slit circular grooves are formed in one end of a first rubber plug, and the slit circular grooves in the first rubber plug and the slit circular grooves in a second rubber plug are consistent in position and size; the upper end of the hard cylindrical screening net is embedded into a small slit circular groove for fixation, and the upper end of the organic glass tube is embedded into a large slit circular groove for fixation; the grouting pipe is inserted into the rubber plug and the pipe end is inserted into the annular space.
6. The undisturbed soaking type circumferential grouting sample preparation instrument for the cylindrical sample according to claim 1, wherein the first rubber plug is provided with two symmetrical holes which are positioned above the circumferential space and used for respectively inserting a grouting pipe, and the outer diameter of each grouting pipe is larger than the diameter of each hole; or the rubber buffer on be equipped with annular and lead to the groove, the slip casting pipe is the double-layer tube that comprises inner tube, outer tube, and the slip casting pipe inserts annular and leads to the inslot, thereby the slip casting liquid flows in the tube gap that inner tube and outer tube formed and gets into the hoop space, the groove width that the annular led to the groove is less than slip casting tub of outer wall and inner wall interval.
7. The undisturbed soaking type circumferential grouting sample preparation instrument for the cylindrical sample according to claim 1, wherein when a first rubber plug and a second rubber plug are plugged in an organic glass tube, the height between the lower end surface of the first rubber plug and the upper end surface of the second rubber plug is just 100mm, the lower end surface of the first rubber plug is just aligned with 100mm scale marks, and the upper end surface of the second rubber plug is just aligned with 0mm scale marks on the organic glass tube.
8. The cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument according to claim 1, wherein slurry enters a sample from a circumferential space through the sieve holes of the hard cylindrical screening net, so that disturbance on a triaxial sample is limited, meanwhile, the organic glass tube and the hard cylindrical screening net are double-section molds, and the sample is convenient to take out in an undisturbed state after the calcareous sand cylindrical sample is solidified.
9. A cylindrical sample undisturbed soaking type circumferential grouting sample preparation method is characterized by being realized by adopting the sample preparation instrument according to any one of claims 1-8, and the sample preparation method comprises the following steps: firstly opening a rubber plug I, putting gravel with the particle size of 0.075 mm-0.4 mm into a hard cylindrical screening net, layering and compacting to form a cylindrical sample with the diameter of 39.1mm and the height of 80 mm-100 mm, and after a sample preparation instrument is installed, performing disturbance-free annular grouting to obtain a cylindrical sample meeting the requirement; the whole grouting process is controllable, grouting can be stopped by closing the input liquid peristaltic pump after one type of grout is injected, wherein during grouting, only the backflow pipe water stop clamp is used for clamping the rubber tube in the backflow pipe, so that no grout flows through the backflow pipe, the liquid outlet pipe water stop clamp is taken down, the liquid outlet pipe water stop clamp is used for clamping the rubber tube at the tail of the liquid outlet pipe after grouting is completed, the backflow pipe water stop clamp is taken down, the reflux liquid peristaltic pump is opened, and redundant grout is pumped to a grout storage vessel for next use; and replacing grouting liquid after the specified standing time is met or directly repeating the steps to perform another grouting liquid or the next grouting round.
10. The cylindrical sample undisturbed immersion type circumferential grouting sample preparation method according to claim 9, wherein the grouting end time control method comprises the following steps: and the liquid outlet pipe water stop clamp is clamped on the rubber pipe at the tail part of the liquid outlet pipe and the input liquid peristaltic pump is closed after the liquid is blocked and can not be injected again and the exudate in the liquid outlet pipe can stably flow out, and grouting is finished.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011464047.5A CN112649263B (en) | 2020-12-11 | 2020-12-11 | Cylindrical sample undisturbed soaking type circumferential grouting sample preparation instrument and sample preparation method |
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| CN113607515A (en) * | 2021-07-22 | 2021-11-05 | 海南大学 | Sample preparation device for calcareous sand test |
| CN113155567B (en) * | 2021-04-20 | 2024-05-10 | 浙江科技学院 | Hollow cylinder sample MICP curing sample preparation instrument and sample preparation method |
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