CN109752228B - Sample preparation device and method for simulating composite stratum and reserving grouting holes - Google Patents
Sample preparation device and method for simulating composite stratum and reserving grouting holes Download PDFInfo
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- CN109752228B CN109752228B CN201910060400.4A CN201910060400A CN109752228B CN 109752228 B CN109752228 B CN 109752228B CN 201910060400 A CN201910060400 A CN 201910060400A CN 109752228 B CN109752228 B CN 109752228B
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- aluminum sleeve
- split copper
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- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 56
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000010949 copper Substances 0.000 claims abstract description 46
- 229910052802 copper Inorganic materials 0.000 claims abstract description 46
- 239000002689 soil Substances 0.000 claims abstract description 39
- 238000000465 moulding Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005056 compaction Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000005464 sample preparation method Methods 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 239000004927 clay Substances 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 4
- 239000004411 aluminium Substances 0.000 abstract description 3
- 238000007569 slipcasting Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a sample preparation device and a sample preparation method for simulating a composite stratum and reserving grouting holes. The device mainly comprises: mould platform, split copper sleeve, aluminium sleeve and slip casting pipe. The bottom center of the horizontally placed molding platform is provided with an opening, a sample base is placed on the molding platform, the split copper sleeve is vertically clamped around the sample base, the aluminum sleeve is arranged at the inner center of the split copper sleeve and concentric with the split copper sleeve, the aluminum sleeve is fixedly arranged on the sample base, a grouting pipe is vertically inserted into the opening of the molding platform, and a one-way valve is arranged at the top of the grouting pipe. The invention realizes a pouring sample preparation method and a compaction sample preparation method for simulating the composite stratum, solves the difficulty of sample preparation in the composite simulated composite stratum sample at present, can realize the simulation of the muddy water splitting phenomenon in the composite soil layer, and provides a test foundation for researching the muddy water splitting phenomenon in the composite soil layer.
Description
Technical Field
The invention relates to the technical field of geotechnical test molding, in particular to a sample preparation device and method for simulating a composite stratum and reserving grouting holes.
Background
Compared with rock, the muddy water splitting phenomenon in the soil body is a newer problem, and the research on the soil body splitting test is mainly focused on the research on the splitting pressure at present, so that the size of a sample is smaller. If the stretching phenomenon after the cleavage is to be further studied, the size of the sample needs to be increased to allow a larger space for the cleavage to be stretched.
Currently, the molding methods of geotechnical tests in the prior art are all directed to small-sized (within 10cm diameter) specimens and are all single soil layers, with relatively little simulation of composite formations. Therefore, designing an effective method for preparing large-size samples simulating composite soil layers and reserving grouting holes is a problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention provides a sample preparation device and a sample preparation method for simulating a composite stratum and reserving grouting holes, which are used for overcoming the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
According to one aspect of the present invention, there is provided a sample preparation apparatus for simulating a composite formation and reserving a grouting hole, comprising a molding platform, a split copper sleeve, an aluminum sleeve and a grouting pipe;
the bottom center of the horizontally placed molding platform is provided with an opening, a sample base is placed on the molding platform, the split copper sleeve is vertically clamped around the sample base, the aluminum sleeve is arranged at the inner center of the split copper sleeve and concentric with the split copper sleeve, the aluminum sleeve is fixedly installed on the sample base, the grouting pipe is vertically inserted into the opening of the molding platform, and a one-way valve is arranged at the top of the grouting pipe.
Preferably, one end of the aluminum sleeve is welded with a triangular end head, and the triangular end head is vertically fixed on the sample base through a groove on the sample base.
Preferably, two sides of the other end of the aluminum sleeve are respectively provided with a circular ring handle, and one side of the inside of the aluminum sleeve is provided with a size mark.
Preferably, one side of the inner part of the split copper sleeve is provided with a size mark.
Preferably, the device further comprises a dispensing box, one end of the dispensing box is opened, the other end of the dispensing box is provided with a control valve, a sample is dispensed in the dispensing box, and the control valve controls the flow of the sample out of the dispensing box.
Preferably, the device further comprises a compacting plate for compacting the sample, a plurality of steel nails for scraping the surface layer of the sample are arranged in the compacting plate, the tops of the steel nails are connected with springs, the steel nails are controlled through the pressure-releasing plate, when the detachable pressing plate is installed, the steel nails are pressed into the compacting plate, when the detachable pressing plate is detached, the steel nails are ejected out under the action of the springs, a hollow rod is welded on the upper portion of the compacting plate, a detachable end head is arranged at the bottom of the hollow rod, and the diameter of the hollow rod is equal to the outer diameter of the grouting pipe.
According to another aspect of the present invention, there is provided a method of preparing a sample of a composite formation and having a prepared injection hole, for use in the apparatus, the method comprising, during casting molding:
after the inner side of the split copper sleeve and the inner side and the outer side of the aluminum sleeve are fully brushed with lubricating oil, the aluminum sleeve is fixedly connected to a sample base, and then the split copper sleeve is vertically assembled and clamped around the sample base through bolts;
after bentonite, kaolin, gypsum powder and water are prepared into specified clay I and II samples according to a certain proportion in a preparation box, the preparation box filled with the clay I and II samples is hoisted above a molding platform, a control valve of the preparation box is regulated to a specified position, and the equal altitude growth of the two clay samples in a sleeve is ensured;
when the heights of the two clay samples reach the designated height, a control valve of the blending box is closed, and the light aluminum sleeve is lifted vertically upwards at a constant speed, so that the two clay samples are combined before being coagulated;
after the two clay samples are completely solidified, detaching bolts of the split copper sleeves, separating the split copper sleeves, and carrying out a test after the two clay samples are kept stand for a set time.
According to another aspect of the present invention, there is provided a method of preparing a sample of a composite formation and having a prepared injection well, for use in the apparatus, the method comprising, during compaction molding:
s1, brushing lubricating oil on the inner side of the split copper sleeve and the inner side of the aluminum sleeve, fixedly connecting the aluminum sleeve on a sample base, and vertically assembling and clamping the split copper sleeve around the sample base through bolts;
s1, placing a sample soil body on a sample base in an aluminum sleeve, compacting the sample soil body in multiple layers through a compacting plate according to the loosening degree of the sample soil body, and vertically extracting the aluminum sleeve;
s3, turning on a steel nail switch of the compaction plate, taking down a detachable end of the hollow compaction rod, scraping the surface layer of the sample through the rotary compaction plate, inserting the sample into the aluminum sleeve, pouring the soil sample of the next layer, compacting the second layer to fill the soil body, and reciprocating until the height of the sample exceeds the height of the grouting pipe;
s4, repeating the step S3 until the sample reaches the designated height;
s4, detaching the bolts of the split copper sleeves, separating the split copper sleeves, and performing a test after the sample stands for a set time.
According to the technical scheme provided by the embodiment of the invention, the pouring sample preparation method and the compaction sample preparation method for simulating the composite stratum are realized, the difficulty in researching sample preparation in the composite simulated composite stratum sample at present is solved, the simulation of mud water splitting phenomenon in the composite soil layer can be realized, the characteristics of mud water splitting pressure in the composite soil layer, the development rule thereof and the like are obtained, and a test basis is provided for researching mud water splitting phenomenon in the composite soil layer.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a large-size sample preparation device for simulating a composite stratum and reserving grouting holes according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a blending box according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a compacting plate according to an embodiment of the present invention.
Reference numerals:
1. the device comprises a molding platform 2, a split steel sleeve 3, a lightweight aluminum sleeve 4, a size mark 5, a triangular end socket 6, a circular handle 7, a grouting pipe 8, a one-way valve 9, a blending box 10, a control valve 11, a compaction plate 12, steel nails 13, springs 14, a hollow rod 15, a detachable pressing plate 16 and a detachable end socket.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several specific embodiments illustrated in the drawings and in no way should be taken to limit the embodiments of the invention.
The embodiment of the invention designs a large-size sample preparation method for effectively simulating a composite soil layer and reserving grouting holes, lays a foundation for a large-size soil muddy water splitting test, and has important significance for muddy water splitting research in soil.
The embodiment of the invention provides a large-size sample preparation method for simulating a composite stratum and reserving grouting holes, wherein in practical application, a sample with the size larger than 30cm is prepared as a large-size sample.
The invention can simulate the mud water splitting phenomenon in the composite soil layer, and obtain the splitting pressure of mud water in the composite soil layer, the development rule of mud water and other characteristics. Provides a test foundation for researching mud-water splitting phenomenon in the composite soil layer.
The structural schematic diagram of a large-size sample preparation device for simulating a composite stratum and reserving grouting holes, which is provided by the embodiment of the invention, is shown in fig. 1, and comprises the following components:
the molding platform 1 is used for molding on the horizontally placed molding platform 1, an opening is arranged in the center of the molding platform 1, and the molding platform 1 is connected with the grouting system. The sample base is placed on the molding platform 1, and the molding platform 1 takes support action on the sample base.
The split copper sleeve 2 with the diameter of R is vertically clamped around the sample base through bolt splicing. The inner side of the split copper sleeve 2 is provided with a size mark 4.
The light aluminum sleeve 3 with the diameter r is arranged at the inner center of the split copper sleeve 2 and is concentric with the split copper sleeve 2 at the outer side. One end of the aluminum sleeve 3 is welded with a triangular end 5, the triangular end 5 is vertically fixed on the sample base through a groove on the sample base, and two sides of the other end of the aluminum sleeve 3 are respectively provided with a circular ring handle 6, so that the aluminum sleeve is convenient to draw out during sample preparation. The inner side of the aluminium sleeve 3 is provided with a size marking 4.
The grouting pipe 7 is vertically inserted into the opening of the molding platform 1, the top of the grouting pipe 7 is provided with a one-way valve 8, and the one-way valve 8 ensures that soil particles cannot enter the grouting pipe during sample preparation. The grouting pipe 7 is used for opening holes of the sample and grouting in the subsequent splitting test.
Fig. 2 is a schematic structural diagram of a blending box according to an embodiment of the present invention, where one end of the blending box 9 is opened, and the other end is provided with a control valve 10 for controlling the flow of the sample. During use, the dispensing box 9 is placed inside the aluminium sleeve 3 together with the sample therein. The blending box is arranged above the sleeve in the test process, and the control valve can extend into the sleeve.
Fig. 3 is a schematic structural view of a compacting plate according to an embodiment of the present invention, in which a special compacting plate 11 is used for compacting a sample, a series of steel nails 12 with a length of 2cm and a diameter of 2mm are disposed in the compacting plate, a series of springs 13 are attached to the tops of the steel nails 12, the steel nails 12 are controlled by a pressure-releasing plate 15, when the detachable pressing plate 15 is installed, the steel nails 12 are pressed into the compacting plate 11, and when the detachable pressing plate 15 is detached, the steel nails 12 are ejected due to the action of the springs 13 for scraping hairs on the surface layer of the sample. The upper part of the compacting plate 11 is welded with a hollow rod 14, the bottom of the hollow rod 14 is provided with a detachable tip 16, and the diameter of the hollow rod 14 is equal to the outer diameter of the grouting pipe.
The test method of the large-size sample preparation device based on the simulated composite soil layer shown in the figure 1 and reserved with the grouting holes provided by the embodiment of the invention comprises the following steps:
if the casting mould is used (suitable for simulating a clay layer with high viscosity):
s1, brushing lubricating oil on the inner side of the split copper sleeve 2 and the inner side and the outer side of the light aluminum sleeve 3, embedding the light aluminum sleeve 3 on a sample base, assembling the split copper sleeve 2, and screwing down a bolt.
S2, after bentonite, kaolin, gypsum powder and water are prepared into specified clay I and II samples according to a certain proportion in a preparation box 9, the preparation box filled with the clay I and II samples is hoisted to the upper part of a molding platform 1, after the positions are adjusted, a control valve 10 is adjusted to the specified positions, and the equal altitude growth of the two clay samples in a sleeve is ensured.
And S3, when the heights of the two clay samples reach the designated height, closing the blending box control valve 10, and starting to slowly and uniformly vertically lift the light aluminum sleeve 3 upwards so that the two clay samples are fully combined before being coagulated.
S4, after the two clay samples are completely solidified, detaching bolts of the split copper sleeve 2, slowly separating the split copper sleeve 2, and carrying out a test after the two clay samples are kept stand for 24 hours.
For compaction molding (suitable for modeling disturbed soil samples of little or no viscosity):
s1, brushing lubricating oil on the inner side of the split copper sleeve 2 and the inner side and the outer side of the light aluminum sleeve 3, embedding the light aluminum sleeve on a sample base, assembling the split copper sleeve 2, and screwing the bolt.
S2, compacting according to the loosening degree of the sample soil bodies in n layers, wherein each layer respectively places two sample soil bodies with certain mass into a split steel sleeve 2 and a light aluminum sleeve 3, and the mass of the soil in the split steel sleeve 2 isThe mass of the soil in the lightweight aluminum sleeve 3 is +.>Wherein R and R are the radiuses of the split steel sleeve 2 and the lightweight aluminum sleeve 3 respectively; l is the height of the sample; ρ is the density of the soil; w is the water content of the soil, and is obtained by conventional geotechnical test; n is the number of layers.
Slowly droopingThe light aluminum sleeve 3 is directly drawn out, and the sample is compacted to the position by a compacting plate 11 with the diameter RWhere it is located.
S3, detaching the detachable pressing plate 15 of the compaction plate 11, removing the detachable end 15 of the hollow compaction rod 14, scraping the surface layer of the sample by rotating the compaction plate 11, inserting the light aluminum sleeve 3 into the sample, pouring the soil sample of the next layer, installing the pressure-relieving plate 15, compacting the second layer of filled soil body, and reciprocating until the height of the sample exceeds the height of the grouting pipe.
S4, repeating the step S3, wherein the detachable end head 16 of the hollow compacting rod 14 is not detached, and the process is repeated until the sample reaches the designated height L.
S4, detaching the bolts of the split copper sleeve 2, slowly separating the aluminum sleeve 2, and carrying out a test after the sample stands for a period of time.
Based on the device, the specific implementation is as follows:
1. when the pouring method is adopted, if the sample is quickly coagulated, the light aluminum sleeve can be extracted while pouring.
2. When the compaction method is adopted, the layering times can be calculated in advance so that a certain time can just reach the height of the grouting pipe in the compaction process.
In summary, the embodiment of the invention realizes a pouring sample preparation method and a compaction sample preparation method for simulating the composite stratum, solves the difficulty in researching sample preparation in the composite simulated composite stratum sample at present, can realize simulation of mud water splitting phenomenon in the composite soil layer, obtains the characteristics of mud water splitting pressure in the composite soil layer, development rules thereof and the like, and provides a test basis for researching mud water splitting phenomenon in the composite soil layer.
The method can reserve grouting holes in the sample in the pouring method and the compaction method, and has the advantages of simple principle and clear steps.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, with reference to the description of method embodiments in part. The apparatus and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (2)
1. A sample preparation method for simulating a composite stratum and reserving a grouting hole is characterized by being applied to a sample preparation device for simulating the composite stratum and reserving the grouting hole, and comprising a molding platform, a split copper sleeve, an aluminum sleeve and a grouting pipe; an opening is arranged in the center of the bottom of a horizontally placed molding platform, a sample base is placed on the molding platform, a split copper sleeve is vertically clamped around the sample base, an aluminum sleeve is arranged at the inner center of the split copper sleeve and is concentric with the split copper sleeve, the aluminum sleeve is fixedly arranged on the sample base, a grouting pipe is vertically inserted into the opening of the molding platform, a one-way valve is arranged at the top of the grouting pipe, one end of the aluminum sleeve is welded with a triangular end head which is vertically fixed on the sample base through a groove on the sample base, two sides of the other end of the aluminum sleeve are respectively provided with a circular ring handle, one side of the inner part of the aluminum sleeve is provided with a size mark, one side of the inner part of the split copper sleeve is provided with a size mark, one end of a distributing box is opened, the other end of the distributing box is provided with a control valve, a sample is distributed in the distributing box, the control valve controls the flow of the sample flowing out of the distributing box, a compacting plate for compacting the sample is arranged in the compacting plate, a plurality of steel nails for scraping the surface layers of the sample, the tops of the steel nails are connected with springs, the steel nails are controlled through the detachable nails, when the detachable nails are installed and the detachable nails are compacted, the detachable nails are pressed down, the hollow rods are pressed down, and the hollow rods are provided with the diameter of the detachable nails is equal to the diameter of the detachable nails when the hollow rods are ejected from the hollow rods,
in a casting molding process, the method comprises:
after the inner side of the split copper sleeve and the inner side and the outer side of the aluminum sleeve are fully brushed with lubricating oil, the aluminum sleeve is fixedly connected to a sample base, and then the split copper sleeve is vertically assembled and clamped around the sample base through bolts;
after bentonite, kaolin, gypsum powder and water are prepared into specified clay I and II samples according to a certain proportion in a preparation box, the preparation box filled with the clay I and II samples is hoisted above a molding platform, a control valve of the preparation box is regulated to a specified position, and the equal altitude growth of the two clay samples in a sleeve is ensured;
when the heights of the two clay samples reach the designated height, a control valve of the blending box is closed, and the light aluminum sleeve is lifted vertically upwards at a constant speed, so that the two clay samples are combined before being coagulated;
after the two clay samples are completely solidified, detaching bolts of the split copper sleeves, separating the split copper sleeves, and carrying out a test after the two clay samples are kept stand for a set time.
2. A sample preparation method for simulating a composite stratum and reserving a grouting hole is characterized by being applied to a sample preparation device for simulating the composite stratum and reserving the grouting hole, and comprising a molding platform, a split copper sleeve, an aluminum sleeve and a grouting pipe; an opening is arranged in the center of the bottom of a horizontally placed molding platform, a sample base is placed on the molding platform, a split copper sleeve is vertically clamped around the sample base, an aluminum sleeve is arranged at the inner center of the split copper sleeve and is concentric with the split copper sleeve, the aluminum sleeve is fixedly arranged on the sample base, a grouting pipe is vertically inserted into the opening of the molding platform, a one-way valve is arranged at the top of the grouting pipe, one end of the aluminum sleeve is welded with a triangular end head which is vertically fixed on the sample base through a groove on the sample base, two sides of the other end of the aluminum sleeve are respectively provided with a circular ring handle, one side of the inner part of the aluminum sleeve is provided with a size mark, one side of the inner part of the split copper sleeve is provided with a size mark, one end of a distributing box is opened, the other end of the distributing box is provided with a control valve, a sample is distributed in the distributing box, the control valve controls the flow of the sample flowing out of the distributing box, a compacting plate for compacting the sample is arranged in the compacting plate, a plurality of steel nails for scraping the surface layers of the sample, the tops of the steel nails are connected with springs, the steel nails are controlled through the detachable nails, when the detachable nails are installed and the detachable nails are compacted, the detachable nails are pressed down, the hollow rods are pressed down, and the hollow rods are provided with the diameter of the detachable nails is equal to the diameter of the detachable nails when the hollow rods are ejected from the hollow rods,
in a compaction molding process, the method comprises:
s1, brushing lubricating oil on the inner side of the split copper sleeve and the inner side of the aluminum sleeve, fixedly connecting the aluminum sleeve on a sample base, and vertically assembling and clamping the split copper sleeve around the sample base through bolts;
s2, compacting the sample soil according to the loosening degree of the sample soil in n layers, respectively placing two sample soil with certain mass in a split steel sleeve and a light aluminum sleeve in each layer, slowly and vertically extracting the light aluminum sleeve, compacting the sample through a compacting plate,
s3, opening steel nails of the compaction plate, taking down a detachable end of the hollow rod, scraping the surface layer of the sample through the rotary compaction plate, inserting a light aluminum sleeve into the sample, pouring a soil sample of the next layer, compacting a second layer of filled soil body, and reciprocating until the height of the sample exceeds the height of the grouting pipe;
s4, repeating the step S3 until the sample reaches the designated height;
s5, detaching the bolts of the split copper sleeves, separating the split copper sleeves, and performing a test after the sample stands for a set time.
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| CN201910060400.4A CN109752228B (en) | 2019-01-22 | 2019-01-22 | Sample preparation device and method for simulating composite stratum and reserving grouting holes |
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| CN201910060400.4A CN109752228B (en) | 2019-01-22 | 2019-01-22 | Sample preparation device and method for simulating composite stratum and reserving grouting holes |
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| CN111487164B (en) * | 2020-04-21 | 2022-10-14 | 重庆大学 | Novel load-variable pressurizing grouting test method for crushed coal rock mass |
| CN117633959A (en) * | 2023-11-06 | 2024-03-01 | 中煤科工开采研究院有限公司 | Method and device for in-situ acquisition of three-dimensional model of anchor drilling |
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