CN112649263B - 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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- CN112649263B CN112649263B CN202011464047.5A CN202011464047A CN112649263B CN 112649263 B CN112649263 B CN 112649263B CN 202011464047 A CN202011464047 A CN 202011464047A CN 112649263 B CN112649263 B CN 112649263B
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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 west 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 the 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 slurry) 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 about instruments and devices capable of realizing integration of sample preparation and in-situ solidification of a triaxial cylindrical sample of the calcareous sand exist, 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 mold through an organic glass tube hoop, two ends of the organic glass tube are provided with openings, a first rubber plug is arranged at the top opening, and a second rubber plug is arranged at the bottom opening;
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 1mm; 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 for fixation, and the width of the small fine-slit circular grooves 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 backflow pipe is inserted into the 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 method for preparing a cylindrical sample by using the undisturbed soaking type circumferential grouting, 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 carry out another grouting liquid or the next grouting.
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 diagram of a non-disturbance immersion type annular 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 hoops; 9-a second rubber plug; 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 through an organic glass tube ferrule 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 the 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, 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, layering compaction is facilitated, and the specified size of a sample is met. The distance between the upper end of the organic glass tube and the upper limit scale mark (100 mm position) is 20mm, the distance between the lower end of the organic glass tube and the lower limit scale mark (0 mm position) is 30mm, the organic glass tube part without scale marks is used for mounting 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 specified in geotechnical test method standard (2019 edition) is met.
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, there are two symmetric distributions on centre of a circle both sides and hole limit apart from the centre of a circle net distance be 30 mm's diameter for 5 mm's round hole as shown in figure 4 rubber buffer 4 bottom surface, insert the internal diameter for 3mm in 5 mm's round hole, 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 wall of slip casting pipe 3 that the external diameter is 9mm closely laminates, thereby the position of rigidly fixed slip casting pipe 3 has just avoided the hourglass thick liquid, rubber buffer one end is equipped with the slit circular slot of the same degree of depth 20mm with hard cylinder screening net 7 and the 5 horizontal cross-sectional shapes of organic glass pipe respectively, can make a like rubber buffer can closely laminate with hard 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 5mm. As shown in fig. 5, the small circular part of the second rubber plug 9 divided by the slit circular groove is adhered with the filter fiber cotton to prevent the leakage of the calcareous sand without stopping the leakage of the slurry, the design can tightly attach the inner wall and the outer wall of the second rubber plug 9 and the organic glass tube 5 by using the elasticity of the second rubber plug 9 to avoid the slurry leakage, a liquid outlet tube 11 and a 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 using 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 3 mm), and the middle parts of the liquid outlet tube 11 and the backflow tube 10 are connected with a rubber tube for arranging a water stop clip to control whether the water flows through the tube.
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 the position of the hard cylindrical screening net 7.
And (3) sieving the calcareous sand by a 5-mesh sieve (with the aperture of 4 mm) and a 200-mesh sieve (with the aperture of 0.075 mm) 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 (10 mm), 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 ensure that the grout outlet is 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-mentioned embodiments do not limit the technical solutions of the present invention in any way, and all technical solutions obtained by using equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (8)
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 grout into the annular space from the grout storing vessel, and injecting the grout into the sand samples from middle rings 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;
the first rubber plug is provided with two symmetrical holes which are positioned above the annular space and are 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 plug is provided with an annular through groove, the grouting pipe is a double-layer pipe consisting of an inner pipe and an outer pipe, the grouting pipe is inserted into the annular through groove, grouting liquid flows in a pipe gap formed by the inner pipe and the outer pipe so as to enter an annular space, and the groove width of the annular through groove is smaller than the distance between the outer wall and the inner wall of the grouting pipe; the slurry is immersed in the sample through the sieve pores of the hard cylindrical screening net from the annular space, so that the disturbance to the triaxial sample is very limited, meanwhile, the organic glass tube and the hard cylindrical screening net are double-section molds, and the sample can be conveniently taken out in a disturbance-free state after the calcareous sand cylindrical sample is cured.
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 1mm; 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 backflow pipe is inserted into the second rubber plug and the pipe end is inserted into the annular space.
4. The undisturbed immersion type circular grouting sample preparation instrument for the cylindrical sample according to claim 3, wherein 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 combined plug and are both positioned below a circular 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 upper hole of 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 immersion type circumferential grouting sample preparation instrument for the cylindrical sample according to claim 1, wherein when the first rubber plug and the second rubber plug are tightly plugged in the 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 a 100mm scale mark, and the upper end surface of the second rubber plug is just aligned with a 0mm scale mark on the organic glass tube.
7. 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 1-6, and the sample preparation method comprises the following steps: firstly opening a rubber plug, putting gravels with the grain sizes of 0.075mm to 0.4mm into a hard cylindrical screening net, layering and compacting to form a cylindrical sample with the diameter of 39.1mm and the height of 80mm to 100mm, and after a sample preparation instrument is installed, performing disturbance-free circumferential 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 carry out another grouting liquid or the next grouting.
8. The undisturbed immersion type circumferential grouting sample preparation method for the cylindrical sample according to claim 7, wherein the control method of the grouting end time 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)
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| CN113237612B (en) * | 2021-05-06 | 2024-03-19 | 郑州大学 | Test device for simulating grouting reinforcement of offshore wind turbine |
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| CN101749031A (en) * | 2009-12-24 | 2010-06-23 | 北京交通大学 | Compound grouting reinforcement method for subsea tunnel going through water-rich sand stratum |
| CN103790548A (en) * | 2012-10-29 | 2014-05-14 | 中国石油化工股份有限公司 | Grouting pipe with star drill bit and strip-shaped screwed openings |
| CN203130097U (en) * | 2013-02-04 | 2013-08-14 | 陕西煤业化工建设（集团）有限公司 | Small guide pipe for grouting |
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